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been fired; to reset the over-voltage protection circuit turn the power switch OFF for
approximately 20 seconds. External forward current must not exceed 3 Amps.
The power supply is protected from reverse voltages by a diode; the reverse current must not
exceed 3 Amps.
GENERAL
Connecting to the Load
Connection to the output terminals can be made with any of the following: 2mm or 4mm plugs,
spade terminals or wire ends. To minimise voltage drop, the connecting leads to the load should
be of an adequate wire gauge and be kept short.
All outputs are fully floating and either output terminal can be connected to ground. Either output
terminal can be raised to 300V above true ground; however, such voltages are hazardous and
great care should be taken.
When the output switch is in the ON position the current meter displays the load current. Note
that there is a capacitor permanently across the output of the power supply to provide stability
and good transient response. This capacitor will be charged to the set output voltage when the
output switch is OFF. This means that if a low impedance load is connected to the output
terminals and the output is switched to the ON position a pulse of current will flow into the load
until the capacitor discharges, independent of the current limit setting.
Remote Sensing
To overcome connection lead resistance the remote sensing facility should be used (0·1Ω of lead
resistance will drop 0·2V at 2A). Remove the two shorting bars and connect the sense terminals
directly to the load. To ensure good coupling between the output and sense terminals, the sense
wires should be twisted with their corresponding output leads. Alternatively coaxial cable can be
used, with the inner used for sensing.
The voltage drop in each output lead must not exceed 0·5V.
The shorting bars must be re-fitted if the remote sensing facility is not being used. Remote
sensing cannot be used in the tracking mode on either output.
Other Considerations
Since the unit will generate considerable heat when supplying high currents at low vottages,
ventilation must not be restricted.
Note that the output may shut down completely if the current limit is set to less than lmA.
The Manufacturers or their agents overseas will provide a repair service for any unit developing a
fault. Where owners wish to undertake their own maintenance work, this should only be done by
skilled personnel in conjunction with the service manual which may be purchased directly from
the Manufacturers or their agents overseas.
Cleaning
If the PSU requires cleaning use a cloth that is only lightly dampened with water or a mild
detergent. Polish the display window with a soft dry cloth.
WARNING! TO AVOID ELECTRIC SHOCK, OR DAMAGE TO THE PSU, NEVER ALLOW
WATER TO GET INSIDE THE CASE. TO AVOID DAMAGE TO THE CASE OR DISPLAY
WINDOW NEVER CLEAN WITH SOLVENTS.
8
Maintenance
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