Measurement Operation (10)
The current measurement has 2 measurement positions
on the rotary switch:
A
and
mA
.
The A has a 8.000A and 10.00A range, with auto ranging;
the mA has a 80.00mA and 800.0mA range, with auto
ranging.
To measure current, do the following:
1.
Turn off power to the circuit. Discharge all high-
voltage capacitors.
2.
Insert the red test lead into the
A
or
mA
or terminal
and the black test lead into the
COM
terminal.
3.
Set the rotary switch to
A
or
mA
.
Use the
A
terminal and
A
measurement position
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
.
AC current is displayed as an mean value (calibrated
against sine wave effective 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
l
For safety sake, the measuring time for high current,
that is 8.000A and 10.00A range, should be 10
seconds for each measurement and the interval
time between 2 measurements should be greater
than 15 minutes.
l
When current measurement has been completed,
disconnect the connection between the testing leads
and the circuit under test.
Model UT70C: OPERATING MANUAL
25
