HT instruments HT401 - Manual (Page 14)

HT401
EN - 13
4.4.5. AC Current measurement and Frequency
CAUTION
The maximum input AC current is 10A. Do not measure currents exceeding
the limits given in this manual. Exceeding these limits could result in
electrical shocks to the user and damage to the instrument.
Fig. 6: AC current measurements
1. Cut off power supply from the circuit to be measured.
2. Select the or positions
3. Insert the red cable and the black cable into the input terminals mA or A and COM
4. Press the MODE key to activate “AC” or “AC+ DC” modes (see § 4.3.2)
5. Press the RANGE key to activate manual range selection (see § 4.2.1) or use the
Autorange feature. If the current value is unknown select the maximum range
6. Connect the red lead and the black lead in series to the circuit whose current you want
to measure, respecting polarity and the current direction indicated in Fig. 6
7. Supply the circuit to be measured. The display shows the value of current.
8. The message “O.L” indicates that the current being measured exceeds the maximum
value measurable by the instrument
9. Press the MODE key to activate Hz frequency measurement (only position). The
“Hz” symbol is shown at display. Bargraph is disabled for this measurement
10. For Maximum and Minimum value measurement, HOLD function and PEAK HOLD
measurement, please refer to § 4.2