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XI. Operating Instructions
Please check the batteries (AAA 1.5V × 3) before use. If the battery power
is low after the multimeter is powered on, the symbol “ ” will be displayed
on the LCD. To ensure measurement accuracy, please replace the battery in
time. The warning symbol “ ” at the terminals indicates the measured
voltage or current cannot exceed the specified value.
1. Automatic AC/DC voltage measurement (Auto-V LoZ) (Figure 5)
1) Connect red test lead with V terminal, and black with COM.
2) Set the rotary switch to Auto-V LoZ, then connect test lead with measured
power source or load in parallel.
3) Read the measured voltage from LCD. For Auto-V LoZ measurement, the
multimeter selects AC/DC voltage automatically according to the detected
low impedance.
Warning:
To eliminate ghost voltage, the whole circuit is designed with a low
impedance (input impedance is about 3k
Ω
).
Do not input voltage over 600V. It is possible to measure higher voltage,
but the protection provided by the multimeter can be compromised.
Pay special attention to avoid electric shock when working with high voltage.
To check if the multimeter can function well, please measure a known
voltage before use.
If the measured voltage is >30V (AC/DC), the high voltage symbol “ ”
appears; if >600V (AC/DC), the buzzer sounds consecutively and the red
light is lit up.
Disconnect the test lead with measured circuit after all measurement
operations are completed.
2. AC/DC voltage measurement (Figure 5)
1) Connect red test lead with V terminal, and black with COM.
2) Set the rotary switch to ACV or DCV position, select function (ACV or DCV)
corresponding to measurement signal, then connect test lead with power
source or load in parallel.
3) Read the measured voltage from the LCD.
4) In ACV position, long press SEL to enable LPF function. Composite
sinusoidal signal generated by inverter or variable-frequency motor can
be measured through the LPF function, as shown in Figure 6 below. Long
press SELECT again to exit LPF function.
5) When measuring ACV or ACV_LPF, short press SELECT to switch to
measure frequency of voltage, then read the frequency of measured
voltage. For measuring frequency of voltage, the amplitude of input voltage
shall be greater than 10% of full range, see “Technical Specifications” for
details.
6) For frequency detection, analog bar graph and range annunciator can
indicate the current AC voltage, and relatively low range can be selected
asymptotically through manual range function, so as to obtain a stable
reading.
Warning:
The input impedance of the multimeter is about 10MΩ. Measurement error
will be produced when measuring circuit with high impedance. In most
cases, the impedance of circuit is below 10KΩ, thus error of 0.1% or less
can be negligible.
Do not measure input voltage over the range, otherwise correct reading
cannot be obtained and product damage and personal injury may occur.
Do not input voltage over 600V. It is possible to measure higher, but the
protection provided by the multimeter can be compromised.
Pay special attention to avoid electric shock when working with high voltage.
To check if the multimeter can function well, please measure a known
voltage before use.
If the measured voltage is >30V (AC/DC), the high voltage symbol “ ”
appears; if >600V (AC/DC), the buzzer sounds and the red light is lit up.
Disconnect the test lead with measured circuit after all measurement
operations are completed.
3. AC/DC mV voltage measurement (Figure 5)
1) Connect red test lead with V terminal, and black with COM.
2) Set the rotary switch to AC/DC mV position, short press SEL to switch to
ACmV or DCmV measurement mode, then connect test lead with measured
power source or load in parallel.
3) Read the measured voltage from the LCD.
UT117C User Manual
UT117C User Manual
Figure 5
