HT instruments HT401 - Manual (Page 12)

HT401
EN - 11
4.4.3. AC Voltage measurement with low input impedance
CAUTION
The maximum input AC voltage is 1000 V. Do not measure voltages
exceeding the limits given in this manual. Exceeding these limits could
result in electrical shocks to the user and damage to the instrument.
Fig. 4: AC voltage with low impedance (LoZ)
1. Select the AutoV LoZ position (see § 4.3.3)
2. Insert the red cable into input lead
V
 and the black cable into input lead COM
(see Fig. 4)
3. Position the test leads in the desired points of the circuit to be measured. The voltage
value is shown on the display
4. The message “O.L” indicates that the voltage being measured exceeds the maximum
value measurable by the instrument
5. For HOLD function please refer to § 4.2
CAUTION
 Inserting the instrument between phase and ground conductors, the RCDs
protection devices can be tripping out during the test. In this case the
measurement can be performed only inserting the instrument between
phase and neutral conductor firstly checking the neutral electrical potential
 Wait about 1 hours to perform resistance/continuity test measurements
after the AutoV test