17
VOLTAGE MEASUREMENT FREQUENCY Hz
When connected to a system using the three wire lead set or mains plug
the instrument indicates the greatest voltage on the system.
Phase to Earth voltage measurement
Note: measured voltage must not exceed 300 V phase to earth.
To measure the voltage of the electrical supply:
1. Set the instrument to the [V] range.
2. Connect the GREEN or (L0) lead to the protective Earth (PE) and the
RED or (L1) lead to the phase to be measured.
3. The instrument will display the phase to earth voltage.
Touch Voltage
On all Megger LRCD200 series testers, the touch voltage is calculated at
the start of an RCD test to ensure it will remain below the safe 25 V or 50 V
limit as required by the application.
On the LRCD200 series instruments, the touch voltage limit can be
switched from 50 V to 25 V as the application demands.
Should the touch voltage calculation identify a higher touch voltage than
that permitted, the LRCD tester will stop the test, thus preventing the
prescence of an unsafe voltage on the earth during the test, should the
test have taken place.
For those customers that require the touch voltage to be displayed, this
can be displayed by activating the analogue arc display, as described in the
instrument set-up procedure.
Once activated the touch voltage will be displayed on an RCD test, even if
the voltage is below the permitted limits.
To measure the frequency of the electrical supply:
1. Set the instrument to the [Hz] range.
2. Connect the GREEN or (L0) lead to the protective Earth (PE) and the
RED or (L1) lead to the phase to be measured.
3. The instrument will display the frequency in Hz.
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