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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
mA
or
20A
terminal
and the black test lead into the
COM
terminal. When
measuring current at 200mA below, insert the red test
lead into
mA
terminal while measuring current 200mA
or above, insert the red test lead into
20A
terminal
3. Set the rotary switch to an appropriate measurement
position in
A
range.
4. 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.
5. Turn on power to the circuit.
The measured value shows on the display.
If the value of current to be measured is unknown, use
the maximum measurement position (20A) and
20A
terminal, and reduce the range step by step until a
satisfactory reading is obtained.
Replace appropriate rating fuse when the fuse is burnt.
Fuse specification: 0.315A. 250V fast type fuse,
φ
5 x 20mm
At 20A Range:
For continuous measurement 10
seconds and interval not less than 15 minutes.
When current measurement has been completed,
disconnect the connection between the testing leads
and the circuit under test.
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Note
Model UT39E: OPERATING MANUAL
