HT instruments HT39 - Manual (Page 13)

HT37 - HT39
EN - 12
4.3.3. DC Current measurement
CAUTION
Maximum input for DC current is 10A. Do not attempt to take any current
measurement exceeding such limit to avoid the risk of electrical shock and
damages to the instrument.
Fig. 5: DC Current measurement
1. Switch OFF the circuit under test.
2. Turn the selector on A.
3. Insert the red test lead into A jack and the black plug into COM jack (Fig. 5).
4. Connect red and black plugs in series with the circuit under test respecting the polarity
and current flow indicated in Fig. 5.
5. Power the circuit under test. The current value is displayed.
6. The message "OL" means that the current exceeds the measuring limits. In this case
disconnect the test leads from the circuit under test to avoid damaging the instrument
or endanger your own safety.
7. If the measured value is lower than 4mA, to get a better resolution:
• Switch off the circuit under test.
• Turn the selector on µA.
• Remove the red test lead from A jack, and insert it into HzVΩµA jack.
• Power the circuit under test.
8. The symbol "-" on the display means that current has opposite direction than shown in
Fig. 5. Press RANGE key for manual range only active in
µA position of the rotary
selector.
9. For minimum and maximum value measurement, HOLD and Relative
∆REL functions
please refer to paragraph 4.2.