version H28986 2014
Note:
1)
The inductor should be disconnected before the supply is switched off so that the circuit is
isolated from the resulting back e.m.f.
2)
The meter is connected in the load circuit to avoid measurement of the current through the
input resistance 125kΩ of the joulemeter.
The d.c. resistance of the meter is small compared with that of the inductor (~7kΩ)
The wattmeter can be used to investigate the dependence on load resistance of a) time
constant b) total energy dissipated
Periodic testing
Check the mains lead and plugs at either end, for any damage.
Periodically check the earth bonding and insulation, by performing a Portable Appliance Test
(PAT). Most schools and local authorities have a regular schedule for such testing.
Please note:
This instrument must be tested (PAT) using the 10 amp Earth Bond test.
Applying the 25 amp test is likely to damage the unit, does NOT make the unit safer, and
damage so caused is not covered by the warranty.
Check that the fuse in the mains plug (5A recommended) are of the correct rating.
Warranty, repairs and spare parts
The joule and wattmeter is guaranteed for a period of one year from the date of delivery to the
customer. This warranty does not apply to defects resulting from the action of a user such as
misuse, improper wiring, any operations outside of its specification, improper maintenance or
repair, or unauthorized modification.
Our liability is limited to repair or replacement of the product. Any failure during the warranty period
should be referred to Customer Services.
In the event of a fault, apart from replacing the instrument fuse in the fuse socket, the power
supply should be referred to the Philip Harris recommended repair agent.
Instructions for authorized service technicians
Ensure that any replaceable mains cord is of the correct rating.
Ensure that all earth conductors and protective earth bonding is maintained after service work.
Please refer to the detailed service procedures, safe servicing and continued safety
– contact
[email protected] for advice.
For any manufacturer specific parts please refer to our recommended repairer.
Please refer to product specific risks that may affect service personnel, the protective measures
and verification of the safe state after repair.
Disclaimer
If the equipment is used in a way not specified by Philip Harris, then the protection provided may
be impaired.
