WHADDA WSEDU09 Educational Pc Oscilloscope Kit Instruction Manual
- June 12, 2024
- WHADDA
Table of Contents
WHADDA WSEDU09 Educational Pc Oscilloscope Kit
Product Information
- Product Name: Educational PC Oscilloscope Kit WSEDU09
- Manufacturer: whadda.com
Features:
- Duty cycle measurement
- Frequency measurement
- Transient Recorder
- Spectrum Analyzer
General information
- markers for: amplitude/voltage & frequency/time expert or basic mode selection in software
- input coupling: DC and AC
- 8 bit resolution
- storage of display and data
- power supply through USB: +/- 200 mA
- uses Microsoft® human interface device (HID) driver, no external driver required
- dimensions: 94 x 94 mm / 3.7 x 3.7”
Oscilloscope
- bandwidth: DC to 200 kHz ± 3 dB
- input impedance: 100 kohm / 20 pF
- maximum input voltage: 30 V (AC + DC)
- time base: 10 µs to 500 ms per division
- input range: 100 mV to 5 V/division
- input sensitivity: 3 mV display resolution
- readouts: True RMS, dBV, dBm, p to p, Duty cycle, Frequency…
- record length: 1k samples
- sampling frequency: 62.5 Hz to 1.5 MHz
- sample history function
- auto set-up function
- pre-trigger function: on 0.1 ms/div .. 500 ms/div ranges
- persistence options: Colour graded, Variable and Infinite
Transient Recorder
- timescale: 20 ms/div to 2000 s/div
- max. recording time: 9.4 h/screen
- automatic storage of data
- record and display of screens
- automatic recording for more than 1 year
- max. number of samples: 100/s
- min. number of samples: 1 sample/20 s
Spectrum Analyzer
- frequency range: 0 .. 150 Hz to 75 kHz
- operating principle: FFT (Fast Fourier Transform)
- FFT resolution: 512 lines
Min. system requirements
- IBM compatible PC
- Windows® XP, Vista, 7, 8 *
- SVGA display card (min. 1024 x 768)
- mouse
- free USB port 1.1 or 2.0
Assembly
Ok, so we have your attention. These hints will help you to make this project successful. Read them carefully.
Make sure you have the right tools:
- A good quality soldering iron (25-40W) with a small tip.
- Wipe it often on a wet sponge or cloth, to keep it clean; then apply solder to the tip, to give it a wet look. This is called ‘thinning’ and will protect the tip, and enables you to make good connections. When solder rolls off the tip, it needs cleaning.
- Thin raisin-core solder. Do not use any flux or grease.
- A diagonal cutter to trim excess wires. To avoid injury when cutting excess leads, hold the lead so they cannot fly towards the eyes.
- Needle nose pliers, for bending leads, or to hold components in place.
- Small blade and Phillips screwdrivers. A basic range is fine.
- For some projects, a basic multi-meter is required, or might be handy
Assembly Hints:
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Make sure the skill level matches your experience, to avoid disappointments.
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Follow the instructions carefully. Read and understand the entire step before you perform each operation.
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Perform the assembly in the correct order as stated in this manual
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Position all parts on the PCB (Printed Circuit Board) as shown on the drawings.
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Values on the circuit diagram are subject to changes, the values in this assembly guide are correct*
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Use the check-boxes to mark your progress.
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Please read the included information on safety and customer service
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Typographical inaccuracies excluded. Always look for possible last minute manual updates, indicated as ‘NOTE’ on a separate leaflet.
Soldering Hints:
- Mount the component against the PCB surface and carefully solder the leads
- Make sure the solder joints are cone-shaped and shiny
- Trim excess leads as close as possible to the solder joint
DO NOT BLINDLY FOLLOW THE ORDER OF THE COMPONENTS ON THE TAPE. ALWAYS CHECK THEIR VALUE WITH THE PARTS LIST!
CONSTRUCTION
Calibration & assembly
CALIBRATION
There is no external driver necessary, the WSEDU09 uses the internal
Microsoft Windows HID driver, these will loaded automatic.
- Set RV1 to the middle position.
- Connect the WSEDU09 oscilloscope to the USB slot of the PC. The red led should light.
- Run the installed software WSEDU09.EXE
- If it is connected for the first time, calibration procedure will start automatically.
- If it does not start automatically: In the Options menu select “Calibrate” and then click OK to start the calibration. Wait until calibration is successful.
Advanced calibration: Fine tuning of the input amplifier circuit (requires a 1.5V battery) This calibration is not really necessary, you must only do this, if you want a higher precision of your measurements:
- In the ‘Options’-menu select “Expert Settings”.
- In the ‘View’-menu select “Waveform Parameters…”.
- In the ‘Waveform Parameters’-window select the check box “DC Mean”.
- Measure the output of the battery with a multi-meter and remember it.
- Connect the battery to the oscilloscope’s input.
- Set Volts/Div. to “0.5V” and click the “Run” button.
- Adjust trimmer RV1 until the displayed “DC Mean” value in the ‘Waveform Parameters’-window corresponds with the measured value.
- Remove battery.
ASSEMBLY
Make sure to check out our WSEDU6 Oscilloscope tutor kit. It features lots of
information and a number of experiments to familiarise yourself with the
basics of an oscilloscope.
OSCILLOSCOPE TERMINOLOGY
- Volts/div: Determines how many volts the signal at the input must swing for the trace to move one division.
- Time/div: Determines the time the trace needs to scan from the the left hand side to the right hand side of a division.
- Division: Imaginary or visible grid on the oscilloscope screen. It helps estimating signal amplitude and period.
- Period (T): Duration of one cycle of the AC waveform (= 1/f).
- Frequency (f): The number cycles of the AC waveform per sec.
- Trace: ‘line’ that is drawn on the screen, which represents the signal at the input.
- Amplitude: How far does the signal ‘swing’in a direction. Expressed in mV or V. For repetitive signals: Vpeak.
- Peak-to-peak: Difference between most positive and most negative swing of the signal. 2xVpeak for sinusoidal signals.
- AC coupling: The oscilloscope only displays the AC component of a signal, any DC level is ignored.
- Analog: Analog scopes use the incoming signal to deflect an electron beam, which scans from left to right on the screen. The electron beam leaves an image on the screen which represents the signal you’ve applied. Analog signals are continuously variable. See also ‘Digital’.
- ‘Auto-setup’ mode: The oscilloscope automatically selects a setting for Volts/div and Time/div in such a way that one or more periods of signal are displayed correctly.
- Clipping: When the ‘top’ or ‘bottom’ or both extremes of a signal are cut-off (‘clipped’), e.g. because the signal cannot swing any further due to power supply limitations. An undesired property of amplifiers that are driven beyond their specs.
- DC coupling: The oscilloscope displays both the AC and the DC component of a signal.
- Digital: Digital scopes perform an analog to digital conversion on the incoming signal and handle all the calculations and displaying in the digital domain. Digital signals feature only two fixed levels, usually 0V and +5V. See also ‘Analog’.
- Distortion: Undesired alteration of a signal due to external causes such as overloaded circuits, badly designed circuits, etc…
- Noise: Undesired random addition to a signal.
- Ripple: Unwanted periodic variation of a DC voltage.
- Signal: Voltage applied to the input of the oscilloscope. The subject of your measurement.
- Sine wave: Mathematical function that represents a smooth repetitive oscillation. The waveform shown at the start of this glossary is a sine wave.
- Spikes: Fast, short duration transients in a signal.
- AC voltage: (AC: Alternating Current) With AC, the flow of the current periodically reverses, as opposed to DC, where the current flows in one direction. An AC source does not have a polarity.
- Bandwidth: Usually expressed in MHz. It is the frequency at which an applied sine wave will be displayed at an amplitude of around 70% of its original amplitude. More expensive scopes feature a higher bandwidth. Rule of thumb: the bandwidth of an oscilloscope needs to be at least 5 times higher than the frequency of the signal applied to the input of the scope. The EDU09 bandwidth goes up to 200KHz.
- DC reference: DC measurement is always performed with respect to a ground level, so we need to define this ground level. If you do not set the DC reference, the readout might not be correct. In most cases, this ground level will be the center of the screen, however this is not mandatory.
- DC voltage: (DC:Direct Current) With DC, the current flows in a single direction, it does not reverse. A DC source has a polarity, (+) and (-).
- Input coupling: The drawing shows typical oscilloscope input circuit. There are 3 possible settings: AC-coupling, DC coupling and GND. With AC-coupling, a capacitor is put in series with the input signal. This capacitor blocks any DC component of the signal and passes only AC. With DC coupling, the capacitor is bypassed and both the AC and DC component of the signal are passed. Low frequency signals (<20Hz) should always be displayed using DC coupling. Should AC coupling be used, the internal coupling capacitor will interfere with the signal and the displayed signal will not be correct.
- Sample rate: Usually expressed in samples or megasamples/second, sometimes in MHz. It is the number of times per second the digital oscilloscope ‘looks’ at the signal at the input. The more it ‘looks’, the better it is able to recreate a faithful image of the waveform on the screen. Theoretically the sample rate needs to be twice the max. frequency of the applied signal, however, for best results a sample rate of 5 times the max. frequency is recommended. The EDU09 samplerate is 1,5Ms/s or 1,5MHz.
- Sensitivity: Indicates the smallest change of the input signal that makes the trace move up or down on the screen. Usually expressed in mV.
- Slope: It determines where the scope will trigger. This can be on the rising or on the falling slope of the signal.
- Vrms: The rms voltage of an AC source represents the required DC voltage to generate the same amount of heat in a resistor as the AC source would do. For sinusoidal signals, Vrms = Vpeak / sqrt(2)
PCB
Diagram
Leds and how to use them
Modifications and typographical errors reserved – © Velleman Group nv. , Legen Heirweg 33 – 9890 Gavere. WSEDU09 – 13082021
References
Read User Manual Online (PDF format)
Read User Manual Online (PDF format) >>