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3.6 Operating Duty Ratio
The voltage tester should be operated (ON)
for a maximum period of 30 seconds. This
should be followed by a recovery period
(OFF) of 4 minutes.
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.
3.7 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, PD700 or PD710 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.
VT25/
VT28
LED's
RX
ELV
+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.
Voltage
source
230V 50Hz
Off
On
On
On
On
On
On
On
Off
Off
Proving unit type
PD430
PD690
PD440
PD700
Off
Off
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
Off
On
PD710
Off
On
Only +
or - On*
On
On
On
On
On
On
9
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