8
B. DC/AC Current Measurement
(See figure 3)
figure 3
Warning
Before connecting the Meter to the return circuit to be tested, cut off the current
of the return circuit.
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.
To measure current, do the following:
1. Insert the red test lead into the
mA
or
A
input terminal and the black test lead
into the
COM
terminal.
2. Set the rotary switch to
A
,
mA
, or
A.
3. The Meter defaults to DC current measurement mode. To toggle between DC
and AC current measurement function, press
BLUE
button.
4. Connect the test lead in serial to the return circuit to be tested. The measured
value shows on the display.
UT61A, UT61B and UT61C:
display effective value of sine wave (mean
value response).
UT61D and UT61E:
display true rms value.
5. Press
Hz%
to obtain the frequency and duty cycle value.
Input Amplitude: (DC electric level is zero)
Input Amplitude: range 30%
Frequency response:UT61A and B 400Hz
UT61C , UT61D andUT61E 1KHz
Note
l
If the value of current to be measured is unknown, use the maximum measurement
position, and reduce the range step by step until a satisfactory reading is obtained.
l
For safety sake, each measurement time for >5A current should be less than
10 seconds 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, and remove the testing leads
