Calibration
Allow at least 5 minutes warm-up before commencing calibration.
Access to Calibration Adjustments
All adjustments are on the control board, which is mounted above the main (power) board, except
where stated. 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 to release the top cover.
Component adjustment references are given as Channel A/ Channel B, e.g. VR5/VR105;
Channel A is the left-hand output (Output 1).
Equipment Required
5½ digit multimeter with better than 0·05% DC Volts accuracy and better than 0·1% DC Amps
accuracy (to 10A); alternatively use a precision shunt for current measurement.
Rheostat or other high power load arrangement to provide up to 5A load at 35V and 10A at 12V.
A small switch, 15k
Ω
resistor and diode.
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