Ac Current Measurement - Tenmars TM-87 User Manual

4.3.4. AC Current measurement

The maximum input for DC current is 10A. Do not attempt to measure
higher currents to avoid electrical shocks or damages to the instrument.
Fig. 5: Using the instrument for AC Current measurement
1. Power off the circuit under test.
2. Selecting the position
" " symbol is shown at display.
3. Insert the test leads into the jacks, the red plug into A jack and black plug into COM
jack (see Fig. 5).
4. Connect the red and the black plugs in series with the circuit whose current is to be
measured.
5. Energize the circuit under test. The current value will be displayed.
O.L
6. The message "
7. If the measured value is lower than 4mA, to get a better resolution:
•
Switch off the circuit under test.
•
Turn the selector on
•
Remove the red test lead from A jack, and insert it into
the circuit under test. Press R/SEL key if necessary to select an higher range.
8. For HOLD function, Minimum and Maximum value measurement, Peak measurement
µA position) and for Relative measurement (for
(for
paragraph 4.2.
A. By pressing R/SEL key to select AC measurement. The
." means that the detected current exceeds the limits.
µA.
CAUTION
A position) please refer to
12
TM-87/TM-88
HzVΩµA jack and power