Seaward B255 - Manual (Page 32)

Operating Manual Clare B255 Power Tool & Appliance Test Station
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8.Instrument Integrity
Calibration
Regulatory authorities require that test instruments are re-calibrated at least
annually. Seaward Electronic Ltd offer a full calibration service for this
instrument, although any other suitably approved test establishment can be
used.
Operational Checks
As well as the instrument undergoing annual, or more frequent, re-calibration
by qualified personnel
The B255 is supplied with a FAULT SIMULATOR (model Y250) specifically for
this purpose.
The simulator is designed for direct plug-in connection to the test output box
using the 13A/230V Test Socket and, by applying the following series of
simple check routines, can be used to check both Earth and Flash ‘Safety’
tests.
It is recommended that such operational checks are carried out at least
weekly, if not daily before use.
NOTE
The Y250 must be kept with the instrument at all times and should be included
in the full calibration programme.
Check Procedure – Earth Continuity
Connect and set-up the Appliance Tester in the normal way and then plug the
Y250 into the 13A test socket on the test output box.
Attach the Earth Return clip lead, from the tester, across BOTH of the metal
tags on the simulator so that they are shorted together – NOTE do not
permanently short these tags by bending them together or creating a soldered
link.
Set the test selector to Earth Test, close the guard switch and depress the
PRESS TO TEST push button for 3 seconds.
The instrument meter should indicate a value of approximately 0.2 Ohms on
the upper scale. Release the button.
The user must check the safety test circuits at regular
intervals to determine the operational integrity.