Digital Multimeter
Page <19>
20/09/10 V1.1
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Warning
Never attempt an in-circuit current measurement where the open-circuit voltage between the circuit and ground is greater than 250V.
If the fuse burns out during measurement, the Meter may be damaged or the operator himself may be hurt. Use proper terminals,
function, and range for the measurement. When the testing leads are connected to the current terminals, do not parallel them across
any circuit.
Measurement Operation (10)
The current measurement has 3 measurement positions on the rotary switch:
The
has a 400.0
µµ
A
and 4000
µµ
A
range, with auto ranging; the
has a 40.00mA and 400.0mA range, with auto ranging;
position has a 4.000A and 10.00A range, with auto ranging.
To measure current, do the following:
1. Turn off power to the circuit. Discharge all high-voltage capacitors.
2.
Model UT60C
Insert the red test lead into the or
µµ
A
µµ
A°C
or
10A
terminal and the black test lead into the
COM
terminal.
:
Insert the red test lead into the or 10Aterminal and the black test lead into the
µµ
A
µµ
A
or
10A
terminal and the black test lead into
theCOM terminal. Use the
10A
terminal and
range if the current value to be tested is an unknown.
4. The Meter defaults to DC current measurement mode. To toggle between DC and AC current measurement function, press
BLUE
button.
UT60C
AC current is displayed as effective value of sine wave (mean value response).
: AC
current is displayed as true rms
value.
5. Break the current path to be tested. Connect the red test lead to the more positive side of the break and the black test lead
to the more negative side of the break.
6. Turn on power to the circuit. The measured value shows on the display.
Note
True root mean square value stability period:
()
When the reading obtained is less than 100 digits, the true root mean square value converter needs a longer time to stabilize. When
there is no input voltage, the maximum reading displayed is 10 digits.
For safety sake, each measurement time for high current should be less than 10 seconds and the interval time between 2
measurements should be greater than 15 minutes.
When current measurement has been completed, disconnect the connection between the testing leads and the circuit under
test, and remove the testing leads away from the input terminals of the Meter.
3. Set the rotary switch to