VC820/VC840 OPERATING MANUAL
20
Use the 20A terminal and
A
range if the current value to be tested is an unknown.
3. Set the rotary switch to
µA
,
mA
, or
A
.
4.
The Meter defaults to DC current measurement mode. To toggle between DC and AC current measurement function,
press
SELECT
(blue button).
VC820:
AC current is displayed as an mean value (calibrated against sine wave effective value).
VC840:
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.
Effective value stability period:
When the reading obtained is less than “100”, the effective value converter needs a longer time to become stabilize. When
there is no input voltage, the maximum reading displayed is “10”.
For safety sake, the measuring time for high current should be less than 10 seconds for each measurement 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.
Operation of Hold Mode
Warning
To avoid possibility of electric shock, do not use Hold mode to determine if circuits are without power. The Hold
mode will not capture unstable or noisy readings.
