UNI-T UT705 Current Loop Calibrator Instruction Manual

Instruction Manual
Loop Calibrator
P/N:110401108718X

Introduction

UT705 is a hand-held loop calibrator with stable performance and up to 0.02% high accuracy. UT705 can measure DC voltage/current and loop current, source/simulate DC current. It is designed with auto stepping and ramping, the 25% stepping function can be used for fast linearity detection. The storage/recall feature also improves the user’s efficiency.

Features

Up to 0.02% output and measurement accuracy 2) Compact and ergonomic design, easy to carry 3) Solid and reliable, suitable for on-site use 4) Auto stepping and ramping output for fast linearity detection 5) Conduct mA measurement while providing loop power to the transmitter 6) Save frequently-used settings for future use 7) Adjustable backlight brightness 8) Convenient battery replacement

Accessories

Open the package box and take out the device. Please check whether the following items are deficient or damaged, and contact your supplier immediately if they are. 1) User manual 1 pc 2) Test leads 1 pair 3) Alligator clip 1 pair 4) 9V battery 1 pc 5) Warranty card 1 pc

Safety Guidelines

4.1 Safety Certification

CE (EMC, RoHS) certification standards EN 61326-1: 2013 Electromagnetic compatibility (EMC) requirements for measuring equipment EN 61326-2-2: 2013
4.2 Safety Instructions This calibrator is designed and manufactured in strict accordance with the safety requirements of GB4793 electronic measuring instruments. Please use the calibrator only as specified in this manual, otherwise, the protection provided by the calibrator may be impaired or lost. To avoid electric shock or personal injury:

• Check the calibrator and the test leads before use. Do not use the calibrator if the test leads or the case appear damaged, or if there is no display on the screen, etc. It is strictly forbidden to use a calibrator without a rear cover (should be closed). Otherwise, it may pose a shock hazard.
• Replace the damage test leads with the same model or the same electrical specifications.
• Do not apply >30V between any terminal and ground or between any two terminals.
• Select the proper function and range according to the measurement requirements.
• Do not use or store the calibrator in high temperature, high humidity, flammable, explosive, and strong electromagnetic environments.
• Remove the test leads on the calibrator before opening the battery cover.
• Check the test leads for damage or exposed metal, and check the test leads continuity. Replace the damaged test leads before use.
• When using the probes, do not touch the metal part of probes. Keep your fingers behind the finger guards on the probes.
• Connect the common test lead and then the live test lead when wiring. Remove the live test lead first when disconnecting.
• Do not use the calibrator if there is any malfunction, the protection might be impaired, please send the calibrator for maintenance.
• Remove the test leads before switching to other measurements or outputs.
• To avoid possible electric shock or personal injury caused by incorrect readings, replace the battery immediately when the low battery indicator appears on the screen.

Electrical Symbols

General Specifications

1. Max voltage between any terminal and ground or between any two terminals: 30V
2. Range: manual
3. Operating temperature: 0°C-50°C (32’F-122 F)
4. Storage temperature: -20°C-70°C (-4’F-158 F)
5. Relative humidity: C95% (0°C-30°C), –C.75% (30°C-40°C), C50% (40°C-50°C)
6. Operating altitude: 0-2000m
7. Battery: 9Vx1
8. Drop test: 1m
9. Dimension: about 96x193x47mm
10. Weight: about 370 (including battery)

External Structure

Connectors (Terminals) (picture 1)

1. Current terminal:
   Current measurement and output terminal

2. COM terminal:
   Common terminal for all measurements and outputs

3. V terminal:
   Voltage measurement terminal

4. 24V terminal:
   24V power supply terminal (LOOP mode)

7.2 Buttons (picture 1a)

current measurement
3| | Short press to select mA mode; long press to select transmitter analog current output
4| | Cycles through:
Continuously outputs 0%-100%-0% with a low slope (slow), and repeats the operation automatically;
Continuously outputs 0%-100%-0% with a high slope (fast), and repeats the operation automatically;
Outputs 0%-100%-0% in 25% step size, and repeats the operation automatically. Long press to set the current value to 100%.
5| | Power on/off (long press)
6| | Short press to turn on/off backlight; long press to set current output value to 0%.
7-10| | Short press to manually adjust the output setting value
| Long press to output 0% value of the currently set range
| Long press to decrease output by 25% of the range
| Long press to increase output by 25% of the range
| Long press to output 100% value of the currently set range

Note: Short press time: <1.5s. Long press time: >1.5s.

LCD Display (picture 2)

Basic Operations and Functions

Measurement and Output

The purpose of this section is to introduce some basic operations of UT705.
Follow the steps below for the voltage measurement:

1. Connect the red test lead to the V terminal, black to the COM terminal; then connect the red probe to possitive terminal of the external voltage source, black to the negative terminal.
2. Press (>2s) to turn on the calibrator and it will perform a self-test, which includes the internal circuit and LCD display testing. The LCD screen will display all symbols for 1s during the self-test. The interface is shown below:
3. Then the product model (UT705) and the auto power off time (Omin: auto power off is disabled) are displayed for 2s, as shown below:
4. Press to switch to voltage measurement mode. In this case, no switching is required after starting up.
5. Press to select the source mode.
6. Press™ or to add or subtract 1 for the value above the underline (the value is automatically carried and the position of the underline remains unchanged); press to change the position of the underline.
7. Use ee to adjust the output value to 10mA, then press until the buzzer makes a “beep” sound, 10mA will be saved as the value of 0%.
8. Similarly, press to increase the output to 20mA, then press until the buzzer makes a “beep” sound, 20mA will be saved as the value of 100%.
9. Long press or to increase or decrease the output between 0% and 100% in 25% steps.

Auto Power Off

• The calibrator will automatically shut down if there is no button or communication operation within the specified time.

• Auto power off time: 30min (factory setting), which is disabled by default and is displayed for about 2s during the booting process.

• To disable “auto power off, press down 6 while turning on the calibrator until the buzzer beeps.
  To enable “auto power off, press down 6 while turning on the calibrator until the buzzer beeps.

• To adjust the “auto power off time’, press down 6 while turning on the calibrator until the buzzer beeps, then adjust the time between 1~30 min with@),@ 2 buttons, long  dress to save settings, ST will flash and then enter the operating mode. If the button is not pressed, the calibrator will exit settings automatically in 5s after pressing the buttons (the current set value will not be saved).

LCD Backlight Brightness Control

Steps:

1. Press down while turning on the calibrator until the buzzer makes a “beep” sound, the interface is as shown below:
2. Then adjust the backlight brightness by the G@ buttons, the brightness value is displayed on the screen.
3. Long press to save settings, ST will flash, and then enter the operating mode. If the button is not pressed, the calibrator will exit settings automatically in 5s after pressing the buttons (the current set value will not be saved).

 Functions

Voltage Measurement

Steps:

1. Press to make the LCD display MEASURE; short press and V unit is displayed.
2. Connect the red test lead to the V terminal, and black to the COM terminal.
3. Then connect the test probes to the voltage points to be tested: connect the red probe to the positive terminal, the black to the negative terminal.
4. Read the data on the screen.

Current Measurement

Steps:

1. Press to make the LCD display MEASURE; short press and the mA unit is displayed.
2. Connect the red test lead to the mA terminal, and black to the COM terminal.
3. Disconnect the circuit path to be tested, and then connect the test probes to the joints: connect the red probe to the positive terminal, the black to the negative terminal.
4. Read the data on the screen.

Loop Current Measurement with Loop Power

The loop power function activates a 24V power supply in series with the current measuring circuit inside the calibrator, allowing you to test the transmitter out of the field power supply of the 2-wire transmitter. The steps are as follows:

1. Press to make the LCD display MEASURE; long press button, LCD will display MEASURE LOOP, the unit is mA.
2. Connect the red test lead to the 24V terminal, black to the mA terminal.
3. Disconnect the circuit path to be tested: connect the red probe to the positive terminal of the 2-wire transmitter, and black to the negative terminal of the 2-wire transmitter.
4. Read the data on the screen.

Current Source Output

Steps:

1. Press) to make the LCD display SOURCE; short press and my unit are displayed.
2. Connect the red test lead to the mA terminal, black to the COM terminal.
3. Connect the red probe to the ammeter positive terminal and the black to the ammeter negative terminal.
4. Select an output digit by< >» buttons, and adjust its value with the W buttons.
5. Read the data on the ammeter.

When the current output is overloaded, LCD will display the overload indicator, and the value on the main display will flash, as shown in the figure below.

Simulating Transmitter

Simulating the 2-wire transmitter is a special operation mode in which the calibrator is connected to the application loop instead of the transmitter, and provides a known and configurable test current. The steps are as follows:

1. Press to make the LCD display SOURCE; long press button, LCD will display SOURCE SIM, the unit is mA.
2. Connect the red test lead to the mA terminal, black to the COM terminal.
3. Connect the red probe to the positive terminal of the external 24V power supply, black to the ammeter positive terminal; then connect the ammeter negative terminal to the negative terminal of the external 24V power supply.
4. Select an output digit by < buttons, and adjust its value with 4 V buttons.
5. Read the data on the ammeter.

Advanced Applications

Setting 0 % and 100 % Output Parameters

Users need to set the values of 0% and 100% for the step operation and percentage display. Some values of the calibrator have been set before delivering. The table below lists the factory settings.

These factory settings may not be suitable for your work. You can reset them according to your requirements.
To reset the 0% and 100% values, select a value and long press or until the buzzer beeps, the newly set value will be saved automatically in the calibrator’s storage area and it is still valid after restarting. Now you can do the following with the new settings:

• Long press or to manually step (increase or decrease) the output in 25% increments.
• Long press or to switch the output between 0% and 100% range.

Auto Ramping (Increase/Decrease) the Output

The auto ramping function allows you to continuously apply a varying signal from the calibrator to the transmitter, and your hands can be used to test the calibrator’s response.
When you press,   the calibrator will generate a continuous and repeating 0%-100%-0% ramping output.
Three types of ramping waveforms are available:

• A0%-100%-0% 40-second smooth ramp
• M0%-100%-0% 15-second smooth ramp
• © 0%-100%-0% 25% step ramp, pausing 5s at each step
  Press any key to exit the ramping output function.

Technical Specifications

All specifications are based on a one-year calibration period and applied to a temperature range of +18°C-+28°C unless otherwise specified. All specifications are assumed to obtain after 30 minutes of operation.

DC Voltage Measurement

-10°C-8°C, ~2&C-55°C temperature coefficient: ±0.005%FS/°C Input resistance: <1000

DC Current Measurement

24mA (Simulating
transmitter)| 0-24mA| 0. 001 mA| 0. 02+2
-10°C-18°C, +28°C-55°C temperature coefficient: ±0.005%FSM Max load voltage: 20V, equivalent to the voltage of 20mA current on 10000 load.

3 DC Current Output

24V Power Supply: Accuracy: 10%

Maintenance

Warning: Before opening the rear cover or the battery cover, switch off the power supply and remove the test leads from the input terminals and the circuit.

General Maintenance

• Clean the case with a damp cloth and mild detergent. Do not use abrasives or solvents.
• If there is any malfunction, stop using the device and send it for maintenance.
• The calibration and maintenance must be implemented by qualified professionals or designated departments.
• Calibrate once a year to ensure performance indicators.
• Switch off the power supply when not in use. Remove the battery when not in use for a long time.
  “Do not store the calibrator in humid, high temperature or strong electromagnetic environments.

 Battery Installation and Replacement (picture 11)

Remark:
“ ” indicates that the battery power is less than 20%, please replace the battery in time (9V battery), otherwise the measurement accuracy might be affected.

Uni-Trend reserves the right to update the content of this manual without further notice.

UNI-TREND TECHNOLOGY (CHINA) CO.,LTD.
No6, Gong Ye Bei 1st Road,
Songshan Lake National High-Tech Industrial
Development Zone, Dongguan City,
Guangdong Province, China
Tel: (86-769) 8572 3888
http://www.uni-trend.com

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