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The operating duty ratio is 8 to 1, so if the
voltage tester is only ON for 2 seconds then
the OFF period need only be 16 seconds.
3.4 Proving Check
Before each use the voltage tester should
be examined for damage, cracks, cuts or
scratches to the housing, cable and prods.
The cable has black outer and contrasting
inner insulation, to allow damage to the cable
to be easily identified. If there is any doubt
the voltage tester should not be used.
Before and after use, verify the voltage tester
is functioning correctly with a proving device
(PD690-S is recommended), or a known
good voltage source. Do not use the voltage
tester if any expected voltage indication
LED's fail to illuminate correctly during
proving.
The LED's that illuminate during proving will
depend on the magnitude of the proving unit
output or the voltage source. See table 1.
Also check the buzzer sounds during proving.
Table 1.
VT12
LED's
RX
ELV
Phase
+12V
-12V
24V
50V
120V
230V
400V
690V
*Illumination of the 12V polarity LED's
depends on the polarity of the connections to
the PD710. Always reverse the connections
to the PD710 to check the other 12V LED.
If only the ELV LED illuminates during
proving then check the batteries.
Voltage
source
230V 50Hz
Off
On
On
On
On
On
On
On
On
Off
Off
Proving unit type
PD430
PD690
PD440
PD700
Off
On
On
On
On
On
On
On
On
On
On
On
On
On
Off
On
PD710
Off
Off
On
On
On
On
On
Only +
or - On*
On
On
On
On
On
On
On
On
7
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