HT HT4012, User Manual

Page: 36 / 84

HT4012
EN - 11
4.3.3. AC Current measurement
WARNING
•
Make sure that all the test leads are disconnected from the meter's
terminals for current measurement.
•
When measuring current, any strong current nears or closes to the
clamp jaws will affect the accuracy.
•
The instrument is not available for non-sine wave AC signal.
Correct Incorrect
Fig. 6: Use of clamp during AC current measurement
1. Select “
~A
” position.
2. Open the clamp and put the tested conductor in the center of the clamp jaw (see
paragraph 4.1.2), considering the connection showed in Fig. 6.
3. The current value will be indicate on the display with automatic detection of the
appropriate range.
4. Pressing the R-H key you can select manually the measurement ranges the
measurement ranges in cyclic order. Press the R-H key 2 seconds at least to come
back to AUTOMATIC range selection.
5. The "
O.L
" symbol means that the measured quantity is higher than the selected
range. Press the R-H key to select a higher range.
6. If the reading is difficult, press the D-H key to hold the obtained value. To exit from this
function press D-H key again.
wa
WARNING
As the clamp has internal filter it could happen that the meter takes few
seconds to reach 0 value on the display. This is not a defect, indeed the
user can proceed with a test as the temporary displayed value will not be
added to the measured value.