5
Installation
Mains Operating Voltage
The operating voltage of the instrument is shown on the rear panel. Should it be necessary to
change the operating voltage from 230V to 115V or vice-versa, proceed as follows:
1.
Disconnect the instrument from all voltage sources.
2.
Remove the screws which hold the case upper to the case lower and lift off.
3.
Disconnect the 3 way cable from the power supply PCB, remove the six screws and lift
the PCB from the case. The Power Supply PCB has an insulator attached to its underside
to ensure that the batteries are not accidentally short circuited. The centre pin of the
retaining rivets can be carefully pushed out allowing them to be re-used. Replace the
insulator immediately after servicing is complete.
4.
Fit the soldered links for the required operating voltage:-
For 230V fit only LK2
For 115V fit LK1 and LK3 and not LK2
These links may be either tinned copper wire or zero-ohm resistors.
5.
Refit the power supply PCB to the case lower and reconnect the 3 way cable.
6.
Refit the case upper taking care not to overtighten the screws.
7.
To comply with safety standard requirements the operating voltage marked on the rear
panel must be changed to clearly show the new voltage setting.
Fuses
There are no user replaceable fuses in the instrument.
Mains Lead
When a three core mains lead with bare ends is provided it should be connected as follows:
Brown
-
Mains live
Blue
-
Mains Neutral
Green/Yellow
-
Earth
WARNING! THIS INSTRUMENT MUST BE EARTHED
Any interruption of the mains earth conductor inside or outside the instrument will make the
instrument dangerous. Intentional interruption is prohibited.