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UNI-T UT725 User Manual
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UNI-T UT725 User Manual

UNI-T UT725 User Manual

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Preface
Thank you for purchasing this brand new product. In order to use this product safely and correctly, please
read this manual thoroughly, especially the safety notes.
After reading this manual, it is recommended to keep the manual at an easily accessible place, preferably
close to the device, for future reference.
Limited Warranty and Liability
Uni-Trend guarantees that the product is free from any defect in material and workmanship within one year
from the purchase date. This warranty does not apply to damages caused by accident, negligence, misuse,
modification, contamination or improper handling. The dealer shall not be entitled to give any other warranty
on behalf of Uni-Trend. If you need warranty service within the warranty period, please contact your seller
directly.
Uni-Trend will not be responsible for any special, indirect, incidental or subsequent damage or loss caused
by using this device.
2

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Summary of Contents for UNI-T UT725

  • Page 1 Preface Thank you for purchasing this brand new product. In order to use this product safely and correctly, please read this manual thoroughly, especially the safety notes. After reading this manual, it is recommended to keep the manual at an easily accessible place, preferably close to the device, for future reference.

  • Page 2: Table Of Contents

    4. Safety information -------------------------------------------------------------------- 6 UT725 supports the processing of two signals, the upper screen can display test voltage, current (loop power 5. Electrical symbols -------------------------------------------------------------------- 7 supply), resistance and pressure, while the lower screen can display voltage, current, frequency , resistance, 6.

  • Page 3: Features

    To prevent the tested device from being damaged, choose a correct mode before connecting the testing lead. 1. UT725 ---------------------------------------------------------------- 1 piece When connecting the leads, first connect the COM test probe and then connect the other probe. While 2. Test probe ----------------------------------------------------------- 2 pairs disconnecting the lead, first disconnect the live probe and then disconnect the COM probe.

  • Page 4: Electrical Symbols

    The standard definition of measurement in CAT I is applicable to the circuit that does not directly connect 8. Drop test: 1 meter to a power source. 9. Dimension: 224×104×63mm Specific replacement parts must be used when repairing the calibrators. 10.Weight: 640g (including batteries) The inside of the calibrator must be free from water.
  • Page 5 When the lower screen is in output mode, short press to recall and output 100% 2. Buttons value of the preset range. Long press to reset the 100% value. Figure 3 shows the buttons of the meter, When the lower screen is in output mode, press to increase output by 25% of preset range. table 4 describes the functions of the meter.

  • Page 6: Basic Operations

    3. LCD display Symbol Description SOURCE Source output mode MESUER Measurement mode Data adjustment Transmitter output simulation Figure 1 - System setup LOOP loop measurement 1) Auto power off Press to select AUTO POWER OFF, press to set up the auto power off time. The AUTO POWER Battery level OFF time will start when no button is pressed, the counting will restart if any button is pressed.

  • Page 7: Measure Mode

    9. MEASURE mode 9.2 Voltage measurement Upper- screen voltage measurement 9.1 Millivolt measurement Consecutively short press switch between mV, V, mA, LOOP until V is selected. Upper-screen millivolt measurement Consecutively short press to switch between mV, V, mA, LOOP until mV is selected. Figure 9 - Connection Figure 8 - Measurement interface Figure 4 - Measurement interface...

  • Page 8: Milliampere Measurement

    9.3 Milliampere measurement 9.4 LOOP measurement Upper-screen milliampere measurement LOOP measurement function can start the 24V power supply (inside the meter) connected with current Consecutively short press to switch between mV, V, mA, LOOP until mA is selected. measurement circuit in series, this enables users to test the transmitter without power supply of two-wire transmitter on site.

  • Page 9: Pressure Measurement

    Lower-screen resistance measurement In measurement mode (If the meter is in output mode, short press to switch to measurement mode), Ω short press to switch between 2/3/4-wire resistance measurement function and frequency measurement function until resistance measurement is selected. Lower-screen resistance measurement supports 2/3/4-wire connection method (Figure 22).
  • Page 10 Pulse measurement In measurement mode (If the meter is in output mode, short press to switch to measurement mode), consecutively short press to switch between pulse measurement function and switch measurement function until pulse measurement is selected. Figure 27 - Measurement interface Figure 28 - Connection Note: The pressure measurement is with 5-digit display , the specific range depends on pressure transducer .

  • Page 11: Tc Measurement

    10. TC measurement In measurement mode (If the meter is in output mode, short press switch to measurement mode), short press to start TC temperature measurement function. The meter supports temperature measurement of following thermal couples: R, S, K, E, J, T, N, B, L, U, XK, BP, etc.

  • Page 12: Rtd Measurement

    11. RTD measurement In measurement mode (If the meter is in output mode, short press to switch to The meter supports temperature measurement of following RTD: Pt100-385, Pt100-392, Pt100-JIS, Pt200, measurement mode), short press to start RTD temperature measurement function. Pt500, Pt1000, Cu10, Cu50, Cu100, Ni120, etc.

  • Page 13: Source Mode

    12. SOURCE mode Millivolt output In output mode (If the meter is in measurement mode, short press to switch to output mode), consecutively short press to switch between mV, V, mA, and SIM until mV is selected. V mA Figure 41 - Output interface Figure 42 - Connection Note: Press right or left arrow key to change the modified bit of output value, press up or down arrow key to modify output value.
  • Page 14 Note: Resistance output 1. Press right or left arrow key to change the modified bit of output value, press up or down arrow key to In output mode (If the meter is measurement mode, short press to switch to output mode), modify output value.
  • Page 15 Note: 1. Press to switch between 100Hz, 1kHz and 10kHz. 2. Short press to enter the status of editing pulse number, in this status, press direction key to edit the number of pulse, short press again to complete the setting of pulse number and then immediately enter the status of modifying pulse amplitude, in this status, press direction key to modify pulse amplitude, short press to complete the modification of pulse amplitude, the meter starts outputting a preset...
  • Page 16 Based on the instruction, turn on the PC control functionality, set the parameter of serial interface on PC and send the protocol command to control UT725. Please access to UNI-T official website to download the communication protocol. RTD output In output mode (If the meter is measurement mode, short press...

  • Page 17: Advanced Applications

    13. Advanced applications -100 ℃ 260 ℃ -50 ℃ 150 ℃ Cu10 Cu50 Percentage output -50 ℃ 150 ℃ Output function 0% value 100% value Cu100 Stepping operation and percentage display can be used after the values of 0% and 100% are set. Some values of the meter have been set before delivering.

  • Page 18: Specifications

    14. Specifications All specifications are based on one-year calibration period and applied to a temperature range of +18℃ ±1.8℃ 0~500 ~+28℃ unless otherwise specified. All specifications are assumed to obtain after 30 minutes operation. Thermocouple R (TC) 1℃/1℉ ±1.5 ℃ Input specifications 500 1767 ±1.8℃...
  • Page 19 600 800 ±2.2℃ -200 500（2 3 ） ±0.6℃ W/ W Thermocouple B (TC) 800 1000 1℃/1℉ ±1.8℃ -200 500（4 ） ±0.3℃ 1000 1820 ±1.4℃ Pt500 (RTD) 0.1℃/0.1℉ 500 630（2 3 ） ±0.9℃ W/ W -200 0 ±0.85℃ Thermocouple L (TC) 0.1℃/0.1℉...

  • Page 20: Output Specification

    15. Output specification -80 260（2 W/ W 3 ） ±0.3℃ Specifications Range Resolution Accuracy Ni120 (RTD) 0.1℃/0.1℉ -80 260（4 ） ±0.2℃ 0.001mV ±(0.02%+10) 100mV Switch quantity CLOSE/OPEN Minimum duration for open/close test is 500ms 0.01mV ±(0.02%+10) DC voltage measurement 0.0001V ±(0.02%+10) Continuity detection 500Ω...
  • Page 21 ±2dig 100Hz(1Hz~110Hz) 0.01Hz ±0.6℃ -200~ -100℃ 0.1Hz ±2dig 1kHz(0.1kHz~1.1kHz) Thermocouple J (TC) 0.1℃/0.1℉ ±0.5℃ -100~800℃ Switch quantity 10kHz(1kHz~11kHz) ±2dig ±0.7℃ 800~1200℃ 100kHz(10kHz~110kHz) 10Hz ±2dig Thermocouple T (TC) -250~400℃ 0.1℃/0.1℉ ±0.6℃ ±1.5℃ -200~-100℃ 0.1℃/0.1℉ ±1.0℃ 0~100℃ Thermocouple R (TC) 1℃/1℉ ±1.2℃ Thermocouple N (TC) -100~900℃...

  • Page 22: Maintenance And Repair

    Note: 0~800℃ 0.1℃/0.1℉ ±1.2℃ ℃ ℃~ ℃ ℃ 1.Temperature coefficient for -10℃~18 and +28 55 : ±0.005%FS/ . Thermocouple BP (TC) 800~2500℃ 0.1℃/0.1℉ ±2.5℃ 2.Maximum load of DC voltage output: 1mA or 10kΩ, whichever is lower load. 3.Maximum load resistance of DC current output: 1000Ω@20mA. Pt100-385 (RTD) -200~800℃...
  • Page 23 The contents of this manual are subject to change without notice.