Seaward KD1E User Manual
Page 16
KD1E Range
Operating Instructions
14
9.0 Proof
Testing
9.1
Features of a PH3 Proving Unit
9.1.1 The terminations on the unit comprise of a knurled
earth terminal at one end and a small test point on
the top of the unit. The PH3 is available with a
test point designed to mate with either a domed or
a
fl at contact electrode type. Refer to section 3.1.
9.1.2 A push switch operates the test voltage output.
9.1.3 The unit requires an alkaline PP3 type battery,
also
identifi ed as a MN1604 and with the IEC
identifi er 6LR61.
9.1.4 Ensure that the red LED on the proving unit
operates before and after the unit has been used.
Warning – Do not touch the earth terminal and
the brass tip on the proving unit simultaneously.
When the push button is pressed 1.3KV is
generated between these points.
9.2
Testing Potential Indicators using a PH3 Proving Unit.
9.2.1 Type digital indicator. Using the 6 pin plug on
the base of the potential indicator connect the
insulating earth cable to the indicator and
securely
fasten.
9.2.2 The earth clamp attached to the free end of the
insulated earth cable should be attached to the
knurled earth terminal on the proving unit.