Calibration
Allow at least 5 minutes warm-up before commencing calibration.
Access to Calibration Adjustments
All adjustments are on the front panel control board; all the trimmers are adjusted from the
reverse side of the board through holes in the board. To gain access to the board it is necessary
to remove the top cover.
WARNING!
When the instrument is connected to its supply the removal of covers is likely to expose live parts.
The instrument should be disconnected from all voltage sources before it is opened for any
adjustment, replacement, maintenance or repair. Capacitors inside the power supply may still be
charged even if the power supply has been disconnected from all voltage sources but will be
safely discharged about 5 minutes after switching off power.
Any adjustment, maintenance and repair of the opened instrument under voltage shall be avoided
as far as possible and, if inevitable, shall be carried out only by a skilled person who is aware of
the hazard involved.
Remove the 6 side screws and front handle screw to release the top cover.
Control pcb calibration points (viewed from rear)
Equipment Required
A 5½ digit multimeter with better than 0.05% accuracy on dc volts and better than 0.1% accuracy
on dc current (to 10A); alternatively use a precision shunt for current measurement.
Rheostat or other high power load arrangement to provide up to 10A load at 18V.
1k
Ω
1% 0.25W resistor.
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