UNI-T UT161 Series, User Manual

Digital Multimeter-HVAC

A

        FUSED

        1000V max
        MAX 10sec 

        EACH 15min 

USB

3.  AC/DC Millivolt Voltage Measurement (Picture 6) 

1) Insert the red test lead into the            or             terminal, and black test lead 
    

COM

 terminal.

into the 

2) Turn the function dial to the          position.
3) Short press the 

button to switch to AC/DC millivolt voltage measurement 

SELECT 

    if required.
4) Connect the test leads with the measured load or power supply in parallel.
5) Read the voltage value on the display.
6) When measuring AC millivolt voltage, short press the          button to display 
    the frequency/duty ratio of the measured voltage.

Caution:

    Do not input a voltage over 1000V or it may damage the meter.
    Be cautious to avoid electric shock when measuring high voltages.
    After completing the measurement, disconnect the test leads from the circuit 

under test.

    Before each use, verify meter operation by measuring a known voltage.
    The input impedance of the AC mV range is about 10MΩ. This load effect may 

cause measurement errors in high-impedance circuits. In most cases, if the 
impedance of the circuit is below 10kΩ, the error can be ignored (≤0.1%). 

4. LoZ (low impedance) ACV Measurement
    (UT161D, Picture 7)

1) Insert the red test lead into the or             terminal, and black test lead 

into

COM

 terminal.

the 

2) Turn the function dial to the              position.
3) Connect the test leads with the measured load or power supply in parallel.
4) Read the voltage value on the display.
5) Short press the         button to display the frequency/duty ratio of the measured 
    voltage.

Caution:

    Do not input a voltage over 1000V or it may damage the meter.
    Be cautious to avoid electric shock when measuring high voltages.
    After completing the measurement, disconnect the test leads from the circuit 
    under test.
    Before each use, verify meter operation by measuring a known voltage.
    After using the LoZ function, wait 3 minutes before next operation.
    LoZ ACV measurement eliminates ghost voltage for more accurate measurement.

    The input impedance of the DC mV range is infinite (about 1G

Ω

), and it does 

    not attenuate when measuring weak signals, so the measurement accuracy 
    is high. When the test leads are open, there may be a value on the screen, 
    but this is normal and will not affect the measuring result.
    Frequency measurement at 60mV range (AC voltage) is for reference only 
    (UT161B/UT161D).

Picture 6

Picture 7