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3.3 Proving a Test Lamp, Voltage Tester / Indicator, DMM etc.
Place one probe of the unit under test into the right hand socket
of the proving unit until it makes contact with the terminal. Place
the other probe into the left hand terminal of the proving unit and
gently press down. It is important to follow this procedure in order
to ensure PD output voltage is applied to the equipment under test
from the start of the PD output voltage test cycle.
The PD output voltage test cycle starts from when the voltage
indicator is applied to the left hand terminal of the PD.
On the PD440S and PD690S, the output voltage test cycle is
5s long.
On the PD230SRD / PD440SRD / PD440SRDX / PD690SRD, the
output voltage test cycle is up to 10s long.
At the end of these PD units' test cycles, the output voltage drops
to 0V and the output goes into low impedance. For SRD and SRDX
versions, a minimum of 3s is required between tests.
Observe that the required indicators on the unit under test
illuminate, then withdraw the probe from the right hand terminal first,
and then the left.
If none of the proving unit LED's illuminate when performing the
above tests, check the condition of the proving unit batteries and
replace them if required (see section 4.1).
3.4 Test Lamp, Voltage Tester / Indicator Cables
During the above tests, emphasis should also be placed upon the
flexing of the UUT cable along its length, and particularly at the
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