HT instruments HT712 - Manual (Page 10)

HT712
EN - 9
4.4.3. AC voltage and frequency measurement with 1 test leads
CAUTION
The maximum input for AC voltage is 600V. Don’t try to measure higher
voltages to avoid risks of electrical shocks or serious damages to the
instrument.
L1
Fig. 5: AC voltage and frequency
measurement with 1 test lead
1. Turn the selector on .
2. Insert the red probe in the V+/Ω jack (Fig. 5).
3. Keep the instrument gripped correctly by touching
the metallic pad with a finger.
4. Connect the red probe to the desired position of
the circuit under test; the voltage value of that point
to earth will be displayed (automatic range
detection).
5. By pressing the “ ” function key you can
display the frequency value instead of the voltage
one and vice-versa.
6. Should you get the message "
O.L
" it means that
the detected voltage exceeds the limits which the
instrument can measure. In this case stop the
measurement by disconnecting the test leads from
the circuit under test to avoid risks for yourself and
for the instrument.
7. If you want to activate the HOLD function refer to
chapter 4.2.
CAUTION
The instrument detects and displays
the AC voltage value between the
measuring point and the potential
where the operator is located. Such
value is typically the earth potential, but
in some cases it may differ from it. DO
NOT TOUCH THE PHASE CABLE IF
YOU ARE NOT SURE WHETHER
VOLTAGE IS PRESENT OR NOT
.