HT instruments HT4012 - Manual (Page 34)

HT4012
EN - 9
4.3. DESCRIPTION OF ROTARY SWITCH FUNCTION
4.3.1. AC Voltage measurement
WARNING
Maximum input for AC Voltage measurements is 600V. Do not attempt to
take any voltage measurement that exceeds the limits. Exceeding the limits
could cause electrical shock and damage the clamp meter.
Fig. 4: Use of clamp for AC voltage measures
1. Select the “ V~ ” position of selector functions.
2. Insert the test leads into the jack, the red plug into V/
Ω jack, and black plug into COM
jack, like showed in Fig. 4.
3. Insert the two long ends of test leads to the desired circuit, then reading will be
displayed with automatic detection of the appropriate range.
4. Pressing the R-H key you can select manually 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.
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WARNING
As the clamp has high input impedance, it could happen that the meter
shows a continuous digits oscillation at display with missed signals on
inputs which is the result of the amplification of external noise. 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.