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3 Installation
3.1
Mains Operating Voltage
Check that the instrument operating voltage marked on the rear panel is suitable for the local
supply. Should it be necessary to change the operating voltage, proceed as follows:
1.
Warning!
Disconnect the instrument from all voltage sources before beginning this
procedure.
2. Pull out both sides of the handle at the case pivot points, to free the position locking
pegs, and rotate the handle from the stowed position to the position shown below. Then
pull the sides of the handle outwards fully, one at a time, to remove the handle
completely.
3.
Remove the two screws on the rear panel that retain the top cover and slide the top
cover towards the rear, with the soft bezel still in place, until it can be lifted clear.
Note:
To avoid contaminating or damaging the PCB assembly, take care not to touch
any components other than the two shorting connectors described in the next step.
4.
Remove the shorting connector in position PJ4 on the PCB beside the mains
transformer (TX1) and replace it with the alternative shorting connector from the
‘parking’ position PJ8; align pin1 of the connector with the pin 1 corner marker of the
header. ‘Park’ the unused connector on PJ8, see the diagrams below.
For 230V operation PJ4 should be fitted with the connector which has a single red wire
between its centre pins (pins 2 & 3).
For 115V operation PJ4 should be fitted with the connector which has a blue wire
between pins 1 & 3, and a brown wire between pins 2 & 4.
Note that the value of fuse FS3 (500mA) is the same for both AC voltage settings, see
Maintenance,
section 13.
5.
Reassemble in the reverse order.
6.
To comply with safety standard requirements the operating voltage marked on the rear
panel must be changed to clearly show the new voltage setting.