TM-87/TM-88
4.3.4. AC Current measurement
CAUTION
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
A
. By pressing
R/SEL
key to select AC measurement. The
“
” 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.
6. The message "
O.L
.
" means that the detected current exceeds the limits.
7. If the measured value is lower than
4mA
, to get a better resolution:
•
Switch off the circuit under test.
•
Turn the selector on
µ
A
.
•
Remove the red test lead from
A
jack, and insert it into
HzV
Ωµ
A
jack and power
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
(for
µ
A
position) and for Relative measurement (for
A
position) please refer to
paragraph 4.2.
12
Summary of Contents for TM-87
Page 1: ...Autoranging True RMS Multimeter TM 87 TM 88 User s manual HB2TM8700000 ...
Page 26: ......
Page 27: ......
