TiePie engineering WS4D DIFF WiFiScope USB Network WiFi Battery User Manual

TiePie engineering WS4D DIFF WiFiScope USB Network WiFi Battery

Specifications

• Product Name: WiFiScope WS4 DIFF
• Manufacturer: TiePie engineering
• Power Source: USB, Network, Battery
• Input Type: Differential

Product Usage Instructions

1. Hardware Installation

1.1 Powering the Instrument

To power the instrument, follow these steps:

1. Charge the battery by connecting it to a power source.
2. For long-term storage, ensure the battery is charged to prevent damage.

1.2 Instrument Operation Mode

Switch the instrument to the desired operation mode for data collection.

2. Connectivity

2.1 Connect via LAN

To connect via LAN, follow the provided instructions for establishing a network connection.

2.2 Connect via WiFi

To connect via WiFi:

• If your computer/laptop has WiFi capabilities, select the instrument from the available networks.
• If your computer/laptop does not have WiFi, consider using alternative methods for connectivity.

2.3 Connect via USB

To connect via USB:

1. Plug the instrument into a USB port on your computer.
2. If facing connectivity issues, try using a different USB port for a stable connection.

3. Instrument Ground Compensation

Ground compensation is essential for accurate measurements and safety. Follow these guidelines:

• Use the ground compensation cable when necessary.
• Understand when ground compensation is not required to avoid unnecessary connections.

FAQs

• Q: Is it safe to measure directly on the line voltage with the WiFiScope WS4 DIFF?
  • A: No, measuring directly on the line voltage can be very dangerous. Avoid direct measurement on line voltage for safety reasons.

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WiFiScope WS4 DIFF
User manual
USB Network
WiFi Battery power
TiePie engineering

ATTENTION! Measuring directly on the line voltage can be very dangerous.
Copyright ©2024 TiePie engineering. All rights reserved. Revision 2.46, March 2024 This information is subject to change without notice. Despite the care taken for the compilation of this user manual, TiePie engineering can not be held responsible for any damage resulting from errors that may appear in this manual.

Welcome

1

Wireless measuring has now become a reality with the WiFiScope WS4 DIFF. If a large distance needs to be bridged between the measuring instrument and the PC, the WiFiScope WS4 DIFF is the solution for this. Fast measurements and high speed data acquisition are now possible wherever the WiFiScope WS4 DIFF is located in the world.

· Because the WiFiScope WS4 DIFF is battery-powered, it can be used standalone for a long time.
· For measurements in hazardous situations or places where it is not accessible to people for long, the WiFiScope WS4 DIFF offers the solution.
· A connection via WiFi or Network (LAN or WAN with possibly POE) gives the user the possibility to place the measuring instrument where this was previously not possible.
· Collecting and viewing measurement data from different locations on a PC / Laptop is now a possibility because the software supports more WiFiScopes at the same time.
· With the very extensive software package, most measurements can be performed.
· A large library of presets is available so that a novice user can immediately perform advanced measurements with a few mouse clicks.
· The WiFiScope WS4 DIFF has 4 input channels with a maximum sampling rate of 50 MSa/s and a bandwidth of 50 MHz.
· With a WiFi connection, the WiFiScope WS4 DIFF is no longer directly connected to the PC or laptop and short circuits are excluded, this eliminates the fear that something will happen to the PC or Laptop.
· A big advantage of the WiFiScopes is that no ground loops can occur. In traditional measurement systems, ground loops give many problems, resulting in unreliable measurement results. With the WiFiScope, because of the absence of ground loops, long distance remote measurements are possible without the results being influenced by ground loops. Also on short distances the absence of ground loops is important for performing reliable measurements. The WiFiScope prevents ground loops from forming so that the measurement speed and resolution are not affected and the measurements remain reliable.
· Integrating the WiFiScope WS4 DIFF in your own software environment is supported by an API with examples so that the WiFiScope WS4 DIFF can be widely used
· Thanks to a very good hardware structure and advanced software drivers, the WiFiScope WS4 DIFF is suitable for high speed data acquisition up to speeds of 500 kSa/s and measurements up to 50 MSa/s with a record length of 128 kSamples of memory per channel with a resolution of 12 to 16 bit.

Welcome

1

2

Chapter 1

Safety

2

When working with electricity, no instrument can guarantee complete safety. It is the responsibility of the person who works with the instrument to operate it in a safe way. Maximum security is achieved by selecting the proper instruments and following safe working procedures. Safe working tips are given below:

· Always work according (local) regulations.
· Work on installations with voltages higher than 25 VAC or 60 VDC should only be performed by qualified personnel.
· Avoid working alone.
· Observe all indications on the WiFiScope WS4 DIFF before connecting any wiring
· Check the probes/test leads for damages. Do not use them if they are damaged
· Take care when measuring at voltages higher than 25 VAC or 60 VDC. · Do not operate the equipment in an explosive atmosphere or in the pres-
ence of flammable gases or fumes.
· Do not use the equipment if it does not operate properly. Have the equipment inspected by qualified service personal. If necessary, return the equipment to TiePie engineering for service and repair to ensure that safety features are maintained.

Safety 3

Declaration of conformity
TiePie engineering Koperslagersstraat 37 8601 WL Sneek The Netherlands
EC Declaration of conformity
We declare, on our own responsibility, that the product
WiFiScope WS4 DIFF-50 WiFiScope WS4 DIFF-25

3

for which this declaration is valid, is in compliance with
EC directive 2011/65/EU (the RoHS directive) including up to amendment 2021/1980,
EC regulation 1907/2006 (REACH) including up to amendment 2021/2045,
and with

EN 55011:2016/A1:2017 EN 55022:2011/C1:2011

IEC 61000-6-1:2019 EN IEC 61000-6-3:2007/A1:2011/C11:2012 EN

according the conditions of the EMC standard 2004/108/EC,

also with

Canada: ICES-001:2004

Australia/New Zealand: AS/NZS CISPR 11:2011

and

IEC 61010-1:2010/A1:2019 USA: UL 61010-1, Edition 3

and is categorized as 30 Vrms, 42 Vpk, 60 Vdc

Sneek, 1-9-2022 ir. A.P.W.M. Poelsma

Declaration of conformity

5

FCC statement

FCC 15.119
This device complies with Part 15 of FCC Rules. Operation is Subject to following two conditions:
1. This device may not cause harmful interference, and 2. This device must accept any interference received including interference
that cause undesired operation.
FCC 15.105
This equipment has been tested and found to comply within the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
· Reorient or relocate the receiving antenna · Increase the separation between the equipment and receiver · Connect the equipment into an outlet on a different circuit from that to
which the receiver is connected. · Consult the dealer or an experienced radio/TV technician for help.
Any changes or modifications not expressly approved by TiePie engineering can void the authority to operate equipment.
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance of 20 cm between the radiator and your body
Environmental considerations
This section provides information about the environmental impact of the WiFiScope WS4 DIFF.
End-of-life handling
Production of the WiFiScope WS4 DIFF required the extraction and use of natural resources. The equipment may contain substances that could be harmful to the environment or human health if improperly handled at the WiFiScope WS4 DIFF’s end of life.
In order to avoid release of such substances into the environment and to reduce the use of natural resources, recycle the WiFiScope WS4 DIFF in an appropriate system that will ensure that most of the materials are reused or recycled appropriately.

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Chapter 3

The shown symbol indicates that the WiFiScope WS4 DIFF complies with the European Union’s requirements according to Directive 2002/96/EC on waste electrical and electronic equipment (WEEE).

Declaration of conformity

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8

Chapter 3

Introduction

4

Before using the WiFiScope WS4 DIFF first read chapter 2 about safety.

Many technicians investigate electrical signals. Though the measurement may not be electrical, the physical variable is often converted to an electrical signal, with a special transducer. Common transducers are accelerometers, pressure probes, current clamps and temperature probes. The advantages of converting the physical parameters to electrical signals are large, since many instruments for examining electrical signals are available.
The WiFiScope WS4 DIFF is a portable four channel measuring instrument with differential inputs. It can be connected to the computer via USB, wired ethernet and WiFi. When used via WiFi, the WiFiScope WS4 DIFF can be connected to an existing WiFi network or can act as access point to create its own WiFi network.
The WiFiScope WS4 DIFF is equipped with a built-in battery for wireless operation, but can also be powered by an external power supply (incluced in the package) or via the USB interface.
The WiFiScope WS4 DIFF is available in several models with different maximum sampling rates. The native resolution is 12 bits, but user selectable resolutions of 14 and 16 bits are available too, with reduced maximum sampling rate:

Resolution 12 bit 14 bit 16 bit

Model 50 50 MSa/s 3.125 MSa/s 195 kSa/s

Model 25 25 MSa/s 3.125 MSa/s 195 kSa/s

Table 4.1: Maximum sampling rates

The WiFiScope WS4 DIFF supports high speed continuous streaming measurements. The maximum streaming rates are:

Resolution 12 bit 14 bit 16 bit

Model 50 500 kSa/s 480 kSa/s 195 kSa/s

Model 25 250 kSa/s 250 kSa/s 195 kSa/s

Table 4.2: Maximum streaming rates

With the accompanying software the WiFiScope WS4 DIFF can be used as an oscilloscope, a spectrum analyzer, a true RMS voltmeter or a transient recorder. All

Introduction

9

instruments measure by sampling the input signals, digitizing the values, process them, save them and display them.
4.1 Differential input
Most oscilloscopes are equipped with standard, single ended inputs, which are referenced to ground. This means that one side of the input is always connected to ground and the other side to the point of interest in the circuit under test.
Figure 4.1: Single ended input
Therefore the voltage that is measured with an oscilloscope with standard, single ended inputs is always measured between that specific point and ground. When the voltage is not referenced to ground, connecting a standard single ended oscilloscope input to the two points would create a short circuit between one of the points and ground, possibly damaging the circuit and the oscilloscope. A safe way would be to measure the voltage at one of the two points, in reference to ground and at the other point, in reference to ground and then calculate the voltage difference between the two points. On most oscilloscopes this can be done by connecting one of the channels to one point and another channel to the other point and then use the math function CH1 – CH2 in the oscilloscope to display the actual voltage difference. There are some disadvantages to this method:
· a short circuit to ground can be created when an input is wrongly connected · to measure one signal, two channels are occupied · by using two channels, the measurement error is increased, the errors made
on each channel will be combined, resulting in a larger total measurement error · The Common Mode Rejection Ratio (CMRR) of this method is relatively low. If both points have a relative high voltage, but the voltage difference between the two points is small, the voltage difference can only be measured in a high input range, resulting in a low resolution
A much better way is to use an oscilloscope with a differential input.
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Figure 4.2:

Differential input

A differential input is not referenced to ground, but both sides of the input are “floating”. It is therefore possible to connect one side of the input to one point in the circuit and the other side of the input to the other point in the circuit and measure the voltage difference directly.
Advantages of a differential input:

· No risk of creating a short circuit to ground
· Only one channel is required to measure the signal
· More accurate measurements, since only one channel introduces a measurement error
· The CMRR of a differential input is high. If both points have a relative high voltage, but the voltage difference between the two points is small, the voltage difference can be measured in a low input range, resulting in a high resolution

4.1.1

Differential attenuators
To increase the input range of the WiFiScope WS4 DIFF, it comes with a differential 1:10 attenuator for each channel. This differential attenuator is specially designed to be used with the WiFiScope WS4 DIFF.

Figure 4.3: Differential attenuator For a differential input, both sides of the input need to be attenuated.

Introduction 11

Figure 4.4: Differential attenuator matches with differential input
Standard oscilloscope probes and attenuators only attenuate one side of the signal path. These are not suitable to be used with a differential input. Using these on a differential input will have a negative effect on the CMRR and will introduce measurement errors.
Figure 4.5: Standard probe is mismatch with differential input
The Differential Attenuator and the inputs of the WiFiScope WS4 DIFF are differential, which means that the outside of the BNCs are not grounded, but carry life signals.
When using the attenuator, the following points have to be taken into consideration:
· do not connect other cables to the attenuator than the ones that are supplied with the instrument
· do not touch the metal parts of the BNCs when the attenuator is connected to the circuit under test, they can carry a dangerous voltage. It will also influence the measurements and create measurement errors.
· do not connect the outside of the two BNCs of the attenuator to each other as this will short circuit a part of the internal circuit and will create measurement errors
· do not connect the outside of the BNCs of two or more attenuators that are connected to different channels of the WiFiScope WS4 DIFF to each other
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· do not apply excessive mechanical force to the attenuator in any direction (e.g. pulling the cable, using the attenuator as handle to carry the WiFiScope WS4 DIFF, etc.)

4.1.2 4.2

Differential test lead
The WiFiScope WS4 DIFF comes with a special differential test lead. This test lead is specially designed to ensure a good CMRR.
The special heat resistant differential test lead provided with the WiFiScope WS4 DIFF is designed to be immune for noise from the surrounding environment.
Sampling
When sampling the input signal, samples are taken at fixed intervals. At these intervals, the size of the input signal is converted to a number. The accuracy of this number depends on the resolution of the instrument. The higher the resolution, the smaller the voltage steps in which the input range of the instrument is divided. The acquired numbers can be used for various purposes, e.g. to create a graph.

Figure 4.6: Sampling
The sine wave in figure 4.6 is sampled at the dot positions. By connecting the adjacent samples, the original signal can be reconstructed from the samples. You can see the result in figure 4.7.

Introduction 13

Figure 4.7: “connecting” the samples
4.3 Sampling rate
The rate at which the samples are taken is called the sampling rate, the number of samples per second. A higher sampling rate corresponds to a shorter interval between the samples. As is visible in figure 4.8, with a higher sampling rate, the original signal can be reconstructed much better from the measured samples.

Figure 4.8: The effect of the sampling rate

4.3.1

The sampling rate must be higher than 2 times the highest frequency in the input signal. This is called the Nyquist frequency. Theoretically it is possible to reconstruct the input signal with more than 2 samples per period. In practice, 10 to 20 samples per period are recommended to be able to examine the signal thoroughly.
Aliasing
When sampling an analog signal with a certain sampling rate, signals appear in the output with frequencies equal to the sum and difference of the signal frequency and multiples of the sampling rate. For example, when the sampling rate is 1000 Sa/s and the signal frequency is 1250 Hz, the following signal frequencies will be present in the output data:

14 Chapter 4

Multiple of sampling rate …
-1000 0
1000 2000
…

1250 Hz signal
-1000 + 1250 = 250 0 + 1250 = 1250
1000 + 1250 = 2250 2000 + 1250 = 3250

-1250 Hz signal
-1000 – 1250 = -2250 0 – 1250 = -1250
1000 – 1250 = -250 2000 – 1250 = 750

Table 4.3: Aliasing

As stated before, when sampling a signal, only frequencies lower than half the sampling rate can be reconstructed. In this case the sampling rate is 1000 Sa/s, so we can we only observe signals with a frequency ranging from 0 to 500 Hz. This means that from the resulting frequencies in the table, we can only see the 250 Hz signal in the sampled data. This signal is called an alias of the original signal.
If the sampling rate is lower than twice the frequency of the input signal, aliasing will occur. The following illustration shows what happens.

Figure 4.9: Aliasing
In figure 4.9, the green input signal (top) is a triangular signal with a frequency of 1.25 kHz. The signal is sampled with a rate of 1 kSa/s. The corresponding sampling interval is 1/1000Hz = 1ms. The positions at which the signal is sampled are depicted with the blue dots. The red dotted signal (bottom) is the result of the reconstruction. The period time of this triangular signal appears to be 4 ms, which corresponds to an apparent frequency (alias) of 250 Hz (1.25 kHz – 1 kHz).
To avoid aliasing, always start measuring at the highest sampling rate and lower the sampling rate if required.
Introduction 15

4.4 Digitizing
When digitizing the samples, the voltage at each sample time is converted to a number. This is done by comparing the voltage with a number of levels. The resulting number is the number corresponding to the level that is closest to the voltage. The number of levels is determined by the resolution, according to the following relation: LevelCount = 2Resolution. The higher the resolution, the more levels are available and the more accurate the input signal can be reconstructed. In figure 4.10, the same signal is digitized, using two different amounts of levels: 16 (4-bit) and 64 (6-bit).
Figure 4.10: The effect of the resolution
The WiFiScope WS4 DIFF measures at e.g. 14 bit resolution (214=16384 levels). The smallest detectable voltage step depends on the input range. This voltage can be calculated as:
V oltageStep = F ullInputRange/LevelCount
For example, the 200 mV range ranges from -200 mV to +200 mV, therefore the full range is 400 mV. This results in a smallest detectable voltage step of 0.400 V / 16384 = 24.41 µV.
4.5 Signal coupling
The WiFiScope WS4 DIFF has two different settings for the signal coupling: AC and DC. In the setting DC, the signal is directly coupled to the input circuit. All signal components available in the input signal will arrive at the input circuit and will be measured. In the setting AC, a capacitor will be placed between the input connector and the input circuit. This capacitor will block all DC components of the input signal and let all AC components pass through. This can be used to remove a large DC component of the input signal, to be able to measure a small AC component at high resolution.
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When measuring DC signals, make sure to set the signal coupling of the input to DC.
Introduction 17

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Driver installation

5

Before connecting the WiFiScope WS4 DIFF to the computer via USB, the drivers need to be installed.

5.1
5.2 5.3 5.3.1 5.3.2

Introduction
To operate a WiFiScope WS4 DIFF via USB, a driver is required to interface between the measurement software and the instrument. This driver takes care of the low level communication between the computer and the instrument, through USB. When the driver is not installed, or an old, no longer compatible version of the driver is installed, the software will not be able to operate the WiFiScope WS4 DIFF properly or even detect it at all.
Computers running Windows 10
When the WiFiScope WS4 DIFF is plugged in into a USB port of the computer, Windows will detect the instrument and will download the required driver from Windows Update. When the download is finished, the driver will be installed automatically.
Computers running Windows 8 or older
The installation of the USB driver is done in a few steps. Firstly, the driver has to be pre-installed by the driver setup program. This makes sure that all required files are located where Windows can find them. When the instrument is plugged in, Windows will detect new hardware and install the required drivers.
Where to find the driver setup
The driver setup program and measurement software can be found in the download section on TiePie engineering’s website. It is recommended to install the latest version of the software and USB driver from the website. This will guarantee the latest features are included.
Executing the installation utility
To start the driver installation, execute the downloaded driver setup program. The driver install utility can be used for a first time installation of a driver on a system and also to update an existing driver.
The screen shots in this description may differ from the ones displayed on your computer, depending on the Windows version.

Driver installation 19

Figure 5.1: Driver install: step 1 When drivers were already installed, the install utility will remove them before installing the new driver. To remove the old driver successfully, it is essential that the WiFiScope WS4 DIFF is disconnected from the computer prior to starting the driver install utility. When the WiFiScope WS4 DIFF is used with an external power supply, this must be disconnected too. Clicking “Install” will remove existing drivers and install the new driver. A remove entry for the new driver is added to the software applet in the Windows control panel.
Figure 5.2: Driver install: Copying files
20 Chapter 5

Figure 5.3: Driver install: Finished
Driver installation 21

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Hardware installation

6

Drivers have to be installed before the WiFiScope WS4 DIFF is connected to the computer via USB for the first time. See chapter 5 for more information.
6.1 Power the instrument
The WiFiScope WS4 DIFF can be powered in three different ways:
· by its built-in battery · via an external power adapter, connected to the dedicated power input at
the rear panel · via the USB interface
When using the WiFiScope WS4 DIFF via its battery, no external power is required. The power consumption of the WiFiScope WS4 DIFF depends heavily on the settings of the instrument, when using higher sampling rates the instrument uses more power. Also when using larger record lengths, the power consumption increases. It is therefore not possible to give an exact operating time when running on its battery. When the battery is charged, the Battery indicator on the front panel will light up green.

When the battery level becomes low, the Battery indicator on the front panel will light up red.

It is recommended to recharge the battery. When the Battery indicator starts blinking red, the battery is almost empty and immediate recharging is required.
An indicator in the software will show the battery status and an estimation of the remaining operating time.

Hardware installation 23

6.1.1

Charging the battery
Charging the battery is done by connecting the external power supply or by connecting the USB. When the battery is charging, the Battery indicator on the front panel will light up blue.

6.1.2

When connected to USB or external power, the battery will only be charged when the USB or external power can deliver enough power to operate the instrument and to charge the battery. When not enough power is available, the battery will be discharged. This is indicated by a blue blinking Battery indicator on the front panel of the instrument.
Long term storage
When storing the WiFiScope WS4 DIFF for a long time, it is recommended to first charge the battery to approximately 70 %. Do not store the WiFiScope WS4 DIFF for a long time with an empty battery or 100 % fully charged battery, as this may reduce battery capacity.

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6.2 Instrument operation mode
The WiFiScope WS4 DIFF has a USB interface and a network interface, used to connect to the instrument via LAN or WiFi. The Power/Mode button at the front panel determines if the WiFiScope WS4 DIFF operates as USB instrument or as network (LAN or WiFi) instrument. The light in the Power/Mode button indicates in which mode the WiFiScope WS4 DIFF operates. When it is on, the network interface is enabled and the instrument operates as network (LAN or WiFi) instrument. When it is off, the network interface is disabled and the WiFiScope WS4 DIFF operates as USB instrument.

Power/Mode button light off: The WiFiScope WS4 DIFF can only be used via USB

Power/Mode button light on: The WiFiScope WS4 DIFF can only be used via LAN or WiFi

When the network interface of the WiFiScope WS4 DIFF is disabled, it will go to a low power state, to save the battery. To enable it again, a short press on the Power/Mode button is required. When the WiFiScope WS4 DIFF is not connected to external power or USB and is not used for two days (network interface disabled), the WiFiScope WS4 DIFF switches to “Shipping mode”, where the network interface is consuming no power at all. To wake up the WiFiScope WS4 DIFF from shipping mode, press the Power/Mode button for 2 seconds. When arriving from the factory, the WiFiScope WS4 DIFF will be in shipping mode. When for some reason the network interface will not disable (the lights remain on), pressing the Power/Mode button for 3 seconds will force the network interface to be disabled.
For network operation, the WiFiScope WS4 DIFF uses UDP and TCPIP port 5450. Make sure it is open in your fire wall settings.
Hardware installation 25

6.3 Connect via LAN
To use the WiFiScope WS4 DIFF via the LAN, connect the WiFiScope WS4 DIFF LAN port on the rear panel to the LAN via a network cable.
The WiFiScope WS4 DIFF network interface must be enabled via the Power/Mode button on the front panel of the instrument. While the network interface is initializing, the Power/Mode button will blink, when the initialization is finished, the Power/Mode button will light up continuously.
When the LAN cable is connected, the LAN interface will attempt to get an address via DHCP. When that is sucessful, the LAN indicator on the front panel of the instrument will light up green. When afer 20 seconds no DHCP is found, the network interface will switch to linklocal mode and use a link-local address. The LAN indicator on the front panel of the instrument will light up blue to indicate link-local mode. Link-local mode remains active until the LAN cable is removed and the LAN LED goes off. When the LAN cable is then reconnected, getting an address via DHCP is attempted again. In the Multi Channel software, open the Manage instruments dialog and check Seach instruments in local network.
When searching the network is checked, the WiFiScope WS4 DIFF will appear. To connect the software to the WiFiScope WS4 DIFF check it and close the dialog with the OK button.
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6.4 6.4.1

Connect via WiFi
There are several different ways to connect the computer to the WiFiScope WS4 DIFF via WiFi, depending on whether the computer/laptop has WiFi or not.
The computer/laptop has WiFi
To use the WiFiScope WS4 DIFF via WiFi, the network interface must be enabled via the Power/Mode button on the front panel of the instrument. While the network interface is initializing, the Power/Mode button will blink, when the initialization is finished, the Power/Mode button will light continuously.

When the computer does have WiFi, there are two different ways to connect to the instrument via WiFi.
Connect the WiFiScope WS4 DIFF to the local WiFi network
1. In the Multi Channel software open the Manage instruments dialog and check Seach instruments in local network.
2. Place a check in front of the detected WiFiScope WS4 DIFF. It may take a few seconds to discover the instrument.
3. The software will now ask how to connect to the WiFiScope WS4 DIFF, select Add WiFiScope to the ‘WiFi’ network..
4. The connection is now set up, if required, the software will ask for the network password. The setup may take up to 30 seconds.

The WiFiScope WS4 DIFF is now connected to the local network via WiFi.
Hardware installation 27

Connect to the WiFiScope WS4 DIFF directly using WiFi
1. In the Multi Channel software open the Manage instruments dialog and check Seach instruments in local network.
2. Place a check in front of the detected WiFiScope WS4 DIFF. It may take a few seconds to discover the instrument.
3. If the computer is currently connected to a WiFi network, the software will ask how to connect to the WiFiScope WS4 DIFF, select Make a direct WiFi connection to the WiFiScope..
4. The connection is now set up. The setup may take up to 30 seconds.

6.4.2

The WiFiScope WS4 DIFF is now setup as Access Point, to create its own WiFi network. The computer is disconnected from the local WiFi network and connected to the WiFiScope WS4 DIFF WiFi network. The computer will now no longer have internet access and/or access to network locations.
The computer/laptop has NO WiFi
When the computer has no WiFi, the WiFiScope WS4 DIFF will have to be connected to the local network. Therefore, the network interface of the WiFiScope WS4 DIFF must be enabled via the Power/Mode button on the front panel of the instrument. While the network interface is initializing, the Power/Mode button will blink, when the initialization is finished, the Power/Mode button will light continuously.

1. Connect the WiFiScope WS4 DIFF via a cable to the LAN as shown in the section Connect via LAN.
2. In the Multi Channel software open the Manage instruments dialog and check Seach instruments in local network.
3. Place a check in front of the detected WiFiScope WS4 DIFF. It may take a few seconds to discover the instrument.
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4. Click the WiFi button in the istruments manager to open the WiFiScope WS4 DIFF web interface.
5. Login to the web interface (default password = tiepie). 6. In the web interface, connect to the WiFi network using the connect button
(and enter its password if required) 7. When successfully connected, close the web interface and disconnect the
LAN cable. 8. The Multi Channel software will now detect the WiFiScope WS4 DIFF via WiFi,
this may take a few seconds.
Hardware installation 29

6.5 Connect via USB
To use the WiFiScope WS4 DIFF via USB, connect the WiFiScope WS4 DIFF USB port on the rear panel to the computer via a USB cable.

When using the instrument via USB, the network interface must disabled via the Power/Mode button on the front panel of the instrument.

6.5.1

When a USB connection is established, this is indicated by a green lit USB indicator on the front panel of the instrument.
The software can now connect to the WiFiScope WS4 DIFF as local instrument.
Plug into a different USB port
When the WiFiScope WS4 DIFF is plugged into a different USB port, some Windows versions will treat the WiFiScope WS4 DIFF as different hardware and will install the drivers again for that port. This is controlled by Microsoft Windows and is not caused by TiePie engineering.

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Instrument ground compensation

7

7.1 Ground compensation cable

The WiFiScope WS4 DIFF is delivered with a special ground compensation cable, together with three corresponding ground clips in different sizes.

Figure 7.1: Ground compensation
The 1.5 m long ground compensation cable has a 2 mm banana plug at one end, that plugs into the small banana socket at the rear of the WiFiScope WS4 DIFF.

Figure 7.2: Rear ground connection
The other end has a 4 mm banana plug that connects to an alligator clip that can be connected to the ground of the test subject.
7.2 When using the the ground compensation cable
The ground compensation cable between WiFiScope WS4 DIFF and test subject is required when the WiFiScope WS4 DIFF is connected to the mains adapter and/or the USB cable, and the test subject is not grounded.
31 Instrument ground compensation

7.3 When is the ground compensation not required
The ground compensation cable between WiFiScope WS4 DIFF and test subject is not required when:
· When the WiFiScope WS4 DIFF operates on battery power only · When the input range of the WiFiScope WS4 DIFF is set to 20 V or higher
7.4 Why ground compensation?
Mains power supplies usually have noise filtering capacitors between the mains input and the output. When a device is powered by such power supply and it is not grounded, the device will float relative to the ground. This floating voltage can get as high as the mains voltage. This is however not dangerous because the current that can flow is very small. When measuring with a WiFiScope WS4 DIFF, this floating voltage can affect your measurements because of the high input impedance of the WiFiScope WS4 DIFF, which is 1 MOhm. When the WiFiScope WS4 DIFF is only battery powered, your measurements will not be affected, because the WiFiScope WS4 DIFF will also float on the floating voltage of the test subject. When the WiFiScope WS4 DIFF is connected to the USB or connected to the mains, the floating voltage will cause a high common mode voltage at the input of the WiFiScope WS4 DIFF. The inputs of the WiFiScope WS4 DIFF will then clip and you will get strange measurement readings. The common mode range of the WiFiScope WS4 DIFF is 2 V (input range 200 mV to 800 mV), 20 V (input range 2 V to 8 V) or 200 V (input range 20V to 80V). So if you measure in the 200mV range and the floating voltage becomes greater than 2 V, the input channel of the WiFiScope WS4 DIFF will clip and you will measure strange readings. If you measure in the 20 V range (or higher) you will suffer much less from the floating voltage because these are usually smaller than 200 V. When the WiFiScope WS4 DIFF ground is connected to the ground of the test subject, they will both get the same ground level, so there will be no (high) common mode voltage due to floating. You will get no measurement errors then.
32 Chapter 7

Front panel

8

Figure 8.1: Front panel

8.1 8.2
8.3 8.3.1

Channel input connectors
The CH1 ­ CH4 Isolated BNC connectors are the main inputs of the acquisition system. The isolated BNC connectors are not connected to the ground of the WiFiScope WS4 DIFF.
Power/Mode button
The Power/Mode button is situated at the right of the front of the instrument. It is used to switch the mode of the WiFiScope WS4 DIFF between USB use and LAN or WiFi use. To use the WiFiScope WS4 DIFF via LAN or WiFi, the network interface must be enabled, by pressing the Power/Mode button. During initializing the network interface, the Power/Mode button will blink green. When initialization is finished, the indicator in the button will be lit continuously green.
When using the WiFiScope WS4 DIFF via USB, the network interface must be disabled, by pressing the Power/Mode button again. The light in the button will go off.
Status indicators
The WiFiScope WS4 DIFF has a number of status indicators, which can be lit to indicate the status of the instrument.
Status
The status light indicates whether the WiFiScope WS4 DIFF is being used by software or is not in use.

· When lit continuously green, the WiFiScope WS4 DIFF is not being used, it is available to be opened in software.
· When lit continuously blue, the WiFiScope WS4 DIFF is in use, it is already opened in software.

8.3.2

LAN
When the LAN indicator is lit, the WiFiScope WS4 DIFF is connected to a wired network.

Front panel 33

· When lit continuously green, the WiFiScope WS4 DIFF has received a network address via DHCP.
· When lit continuously blue, the WiFiScope WS4 DIFF is assigned a link local address.

8.3.3

WiFi
When the WiFi indicator is lit, the WiFiScope WS4 DIFF is connected to the computer and measuring via a WiFi network. The color indicates how the instrument operates:

· When blinking green, the WiFiScope WS4 DIFF is trying to establish a WiFi connection to an existing network.
· When lit continuously green, the WiFiScope WS4 DIFF has established a connection to an existing WiFi network and has received a network address via DHCP.
· When lit continuously blue, the WiFiScope WS4 DIFF acts as WiFi access point. Connect the computer via WiFi to the network that the WiFiScope WS4 DIFF creates.
· When lit continuously red, WiFi of the WiFiScope WS4 DIFF is disabled in the instrument’s web interface.

8.3.4 8.3.5

USB
When the USB indicator is green, the WiFiScope WS4 DIFF is connected to the computer and measuring via USB.
Batt
The Batt indicator can indicate various different states:

· When lit continuously green, the battery is full, while the extenal power is still connected. When external power is not connected, the battery is being discharged, its level is higher than 5 %.
· When lit continuously blue, the battery is charging.
· When blinking blue, external power or USB power is connected, but cannot deliver enough power to charge the battery.
· When lit continuously red, the battery level is below 5 %, charging is recommended.
· When blinking red, the battery level is below 2 %, immediate charging is required.

34 Chapter 8

Rear panel

9

Figure 9.1: Rear panel
9.1 Power
The WiFiScope WS4 DIFF can be powered by its internal battery, via a dedicated power input at the rear panel and via the USB interface. To charge the battery, connect the external power supply. The battery can also be charged via the USB, but only if the USB can deliver enough power to operate the instrument and charge the battery. If not enough power for both is available, the battery will not be charged, but will be used by the instrument and be discharged. The specifications of the dedicated power connector are:

Pin Center pin Outside bushing

Dimension Ø1.3 mm Ø3.5 mm

Description positive ground

Figure 9.2: Power connector The following minimum and maximum voltages apply to the power inputs:

Minimum Maximum

5 VDC / 2 A 12 VDC / 2 A

Table 9.1: Maximum voltages

Rear panel 35

9.1.1

Power adapter
The WiFiScope WS4 DIFF comes with an external 12 VDC2 A power adapter that can be connected to any mains power net that supplies 100 ­ 240 VAC, 50 ­ 60 Hz. The external power adapter can be connected to the dedicated power connector.

9.2 USB

Figure 9.3: Power adapter

Figure 9.4: USB connector
The WiFiScope WS4 DIFF is equipped with a USB 3.0 Super speed (5 Gbit/s) interface with a USB 3 type B Super speed socket. It will also work on a computer with a USB 2.0 interface, but will then operate at 480 Mbit/s.
9.3 LAN

Figure 9.5: LAN connector The WiFiScope WS4 DIFF is equipped with a 1 Gbit LAN interface with RJ45 socket.
36 Chapter 9

9.4 Extension Connector

Figure 9.6: Extension connector

To connect to the WiFiScope WS4 DIFF a 25 pin female D-sub connector is available, containing the following signals:

Pin Description
1 Ground 2 Reserved 3 External Power in DC 4 Ground 5 +5V out, 10 mA max. 6 Ext. sampling clock in (TTL) 7 Ground 8 Ext. trigger in (TTL) 9 Data OK out (TTL)

Pin Description
10 Ground 11 Trigger out (TTL) 12 Reserved 13 Ext. sampling clock out (TTL) 14 Ground 15 Ground 16 Reserved 17 Ground 18 Reserved

Pin Description
19 Reserved 20 Reserved 21 Reserved 22 Ground 23 I2C SDA 24 I2C SCL 25 Ground

Table 9.2: Pin description Extension connector

All TTL signals are 3.3 V TTL signals which are 5 V tolerant, so they can be connected to 5 V TTL systems.
Pins 9, 11, 12, 13 are open collector outputs. Connect a pull-up resistor of 1 kOhm to pin 5 when using one of these signals.
9.5 Ground connector
The WiFiScope WS4 DIFF has a special 2 mm banana ground connector, to connect a ground compensation lead.

Figure 9.7: Ground connector
For a description on how to use the Ground connector and ground compensation lead, see chapter 7.

Rear panel 37

9.6 Factory reset
Right next to the LAN connector a reset button is located to perform a factory reset on the WiFiScope WS4 DIFF. The factory reset clears all user settings like wifi networks and login codes. To perform a factory reset, perform the following steps:
· If the Power/Mode button on the front is lit, press it to switch it off. · Press the reset button on the rear and keep it pressed. · While keeping the reset button pressed, press the Power/Mode button on
the front again, its light will start blinking. · Keep the reset button pressed until the Power/Mode button starts to light
continuously, then release the reset button. This may take up to 20 seconds. The instrument is now back in factory state as when it left the factory. It is ready to be used again in the same was as indicated in chapter 6.2.
9.7 Ventilation slots
Below the LAN connector and power connector a ventilation slot is located, with a fan behind it. And below the ground connector three smaller ventilation slots are located.
Figure 9.8: Ventilation slots Do not block the ventilation slots as this may cause the WiFiScope WS4 DIFF becoming too hot. Do not insert objects in the ventilation slot as this may damage the fan.
38 Chapter 9

10.1

Firmware update

10

The network module of the WiFiScope WS4 DIFF has internal firmware, that determines its capabilities, when the WiFiScope WS4 DIFF is connected via LAN or WiFi. This firmware can be updated to add new functionality. This chapter describes the steps to update the firmware of the WiFiScope WS4 DIFF.
Preparation

Updating the firmware will clear all entered WiFi network logins.

First make sure that the firmware update image file is obtained and stored on a readily available location on the computer.
To update the firmware, a USB connection between the computer and the WiFiScope WS4 DIFF is required, make sure that the USB cable for the WiFiScope WS4 DIFF is available. Plug the USB cable in a free USB port of the computer, but do not connect it to the WiFiScope WS4 DIFF yet.
· Start the latest version of the Multi Channel software, available from the website.
· In the Multi Channel software, open the Manage instruments window, via the Instruments menu or hotkey Al.t + S.
· Disconnect the WiFiScope WS4 DIFF from external power and, when used, from the wired LAN.
· Switch the Power/Mode button off. All indicators on the front panel of the WiFiScope WS4 DIFF are now off.

10.2

Switching to firmware update mode
· Press the Power/Mode button and keep it pressed. · When the battery indicator lights up, plug the USB cable in the instrument.
The USB light will now turn blue.

· Now release the Power/Mode button. All lights now turn blue. The WiFiScope WS4 DIFF is now in firmware update mode.

Firmware update 39

10.3

Updating the firmware
The Manage instruments window now has an additional tab Update firmware, switch to that tab page.

Click the “File” button and in the File open dialog, browse to the location of the firmware image file and select the image file. The “Update” button is now enabled, click it to start the firmware update process.

A progress bar will show the status of the update. The update process will take approximately 1 minute. When the update is ready, a notification will be shown.
Now unplug the instrument from the USB. The WiFiScope WS4 DIFF can now be used via LAN and WiFi again.
40 Chapter 10

11.1

Web interface

11

The WiFiScope WS4 DIFF has a web interface in which status information of the instrument can be found and in which WiFi network settings can be changed.
Enter the web interface

1. Connect the WiFiScope WS4 DIFF via a cable to the LAN. 2. In the Multi Channel software open the Manage instruments dialog and
check Seach instruments in local network. 3. Place a check in front of the detected WiFiScope WS4 DIFF. It may take a few
seconds to discover the instrument. 4. Click the WiFi button in the istruments manager to open the WiFiScope WS4
DIFF web interface. 5. Login to the web interface (default password = tiepie).

Web interface 41

11.2

Setting a fixed IP address
By default, the WiFiScope WS4 DIFF is setup to receive an IP address by the DHCP server in the local network. When the WiFiScope WS4 DIFF is connected via wired LAN, it is possible to set a fixed IP address, for the instrument to use.
The settings for a fixed IP address are found on the Status page in the web interface.

Clicking the edit button (pen symbol) behind the IPv4 address opens the IPv4 address edit page. By default, the Method is set to Automatic (DCHP), where the DHCP server in the network asssigns an IP address to the WiFiScope WS4 DIFF. When the Method is set to Manual, the following settigns can be defined manually, to your preferences:
· IP address · Subnet mask · Gateway · DNS server
When the WiFiScope WS4 DIFF is connected via WiFi, it is not possible to set a fixed IP address.
42 Chapter 11

Specifications 12.1 Acquisition system

12

Number of input channels CH1, CH2, CH3, CH4
Type Resolution Accuracy Ranges (full scale)
Coupling Impedance Maximum voltage Maximum common mode voltage
200 mV to 800 mV ranges 2 V to 8 V ranges 20 V to 80 V ranges Common Mode Rejection Ratio Channel Isolation Channel Separation Bandwidth (-3dB) AC coupling cut off freq. (-3dB)

4 analog

isolated BNC, female

Differential

12, 14, 16 bit user selectable

0.3% of full scale ± 1 LSB

±200 mV ±2 V ±20 V
AC/DC

±400 mV ±4 V ±40 V

2 M / 40 pF

200 V (DC + AC peak <10 kHz)

2V 20 V 200 V -48 dB 500 V -80 dB 50 MHz ±1.5 Hz

±800 mV ±8 V ±80 V

Maximum sampling rate 12 bit 14 bit 16 bit
Maximum streaming rate 12 bit 14 bit 16 bit
Sampling source Internal Accuracy Stability External Voltage Frequency range
Memory

WS4D-50

WS4D-25

50 MSa/s

25 MSa/s

3.125 MSa/s

3.125 MSa/s

195 kSa/s

195 kSa/s

WS4D-50

WS4D-25

500 kSa/s

250 kSa/s

480 kSa/s

250 kSa/s

195 kSa/s

195 kSa/s

internal quartz, external

Quartz

±0.01% ±100 ppm over -40C to +85C

On extension connector

3.3 V TTL, 5 V TTL tolerant

100 MHz ± 5 %

128 kSamples per channel

Specifications 43

12.2 Trigger system

System Source Trigger modes

12.3

Level adjustment Hysteresis adjustment Resolution Pre trigger Post trigger Trigger hold-off Digital external trigger
Input Range Coupling
Physical

12.4

Height Length Width Weight USB cord length
Power

12.5

Power Consumption Internal battery
Capacity Operating time Power adapter Input Output Dimension
Height Width Length Cable length Order number Replaceable mains plugs for
I/O connectors

CH1, CH2, CH3, CH4 USB LAN Extension connector Power Ground connection

digital, 2 levels CH1, CH2, CH3, CH4, digital external, OR rising slope, falling slope, inside window, outside window 0 to 100% of full scale 0 to 100% of full scale 0.024 % (12 bits) 0 to selected record length, 1 sample resolution 0 to selected record length, 1 sample resolution 0 to 1 MSamples, 1 sample resolution
extension connector 0 to 5 V (TTL) DC
44 mm / 1.7″ 187 mm / 7.4″ 215 mm / 8.5″ 751 g / 26.5 ounce 1.5 m / 59″
From USB, external input or built-in battery 12 VDC, 2 A max Li-ion 7000 mAh, 3.7 V Strongly depending on instrument setup, 3 hours External 110 to 240 VAC, 50 to 60 Hz, 500 mA 12 VDC, 2 A
57 mm / 2.2″ 30 mm / 1.2″ 88 mm / 3.4″ 1.8 m / 70″ TP-UES24LCP-120200SPA EU, US, AU, UK
Isolated female BNC USB3 type B Super Speed socket RJ45 socket D-sub 25 pins female 3.5 mm power socket 2 mm banana socket

44 Chapter 12

12.6 Interface

12.7

USB
Network LAN WiFi Network port (TCPIP and UDP)

USB 2.0 HighSpeed (480 Mbit/s) (USB 3.0 compatible)
1 Gbps 802.11 5450 (IANA assigned)

System requirements

12.8

PC I/O connection Operating System

USB 2.0 or newer Windows 10, 32 and 64 bits

Environmental conditions

12.9

Operating Ambient temperature
Relative humidity Charging
Ambient temperature Relative humidity Storage Ambient temperature Relative humidity

20 C to 25 C for rated accuracy 10 C to 40 C without specifications 10 to 90% non condensing
0 C to 35 C 10 to 90% non condensing
0 C to 35 C 5 to 95% non condensing

Certifications and Compliances

CE mark compliance

Yes

RoHS

Yes

REACH

Yes

EN 55011:2016/A1:2017

Yes

EN 55022:2011/C1:2011

Yes

IEC 61000-6-1:2019 EN

Yes

IEC 61000-6-3:2007/A1:2011/C11:2012

Yes

ICES-001:2004

Yes

AS/NZS CISPR 11:2011

Yes

IEC 61010-1:2010/A1:2019

Yes

UL 61010-1, Edition 3

Yes

Specifications

45

12.10 Differential attenuators

12.11

Model Attenuation Bandwidth Input impedance Maximum input voltage Input connector Output connector Dimensions
Length Diameter Weight Suitable instrument
Measure leads

TP-DA10 10 x, differential 25 MHz 10 M // 15 pF 300 V Female BNC Male BNC
79 mm 19 mm 30 g WiFiScope WS4 DIFF

Model Type Connectors
Instrument side Test point side Bandwidth Safety Dimensions Total length Length to split Length individual ends Weight Color Heat resistant Certification and compliances CE conformity RoHS Accessories Color coding rings Suitable instrument

TP-C812B differential
isolated male BNC connector red and black 4 mm shrouded banana plugs 7 MHz CAT III, 1000 V, double isolated
2000 mm 800 mm 1200 mm 80 g black yes
yes yes
5 x 3 rings, various colors WiFiScope WS4 DIFF

46 Chapter 12

12.12 Package contents

Instrument Test lead Attenuator Accessories
Software Drivers Software Development Kit Manual
12.13 Warranty

WiFiScope WS4 DIFF
4 x TP-C812B low noise differential test leads with 4 mm banana plugs
4 x TP-DA10 differential attenuator X10
Ground compensation cable TP-GCC150 with 3 alligator clips External power adapter network cable USB cable
Windows 10, 32 and 64 bits, via website
Windows 10, 32 and 64 bits, via website
Windows 10 and Linux, via website
Quick Start Guide, Instrument manual and software manual

TiePie engineering instruments are designed, manufactured and tested to provide high reliability. In the unlikely event you experience difficulties, the TiePie engineering instruments are fully warranted for two years.

This warranty includes

All parts and labor (excluding probes and/or measure leads and/or batteries) Warranty on batteries is 6 months. No charge for return shipping Long-term 7 year support Upgrade to the latest software at no charge

Optionally available

Extension to five year warranty, option W5

Specifications 47

48 Chapter 12

If you have any suggestions and/or remarks regarding this manual, please contact:

TiePie engineering Koperslagersstraat 37 8601 WL SNEEK The Netherlands

Tel.: Fax: E-mail: Site:

+31 515 415 416 +31 515 418 819 support@tiepie.nl www.tiepie.com

TiePie engineering WiFiScope WS4 DIFF instrument manual revision 2.46, March 2024

References

• TiePie - USB oscilloscopes, spectrum analyzers, data loggers, multimeters, Arbitrary Waveform Generators

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