Installation
Mains Operating Voltage
Check that the operating voltage of the instrument shown on the rear panel is suitable for the
local supply. Should it be necessary to change the operating voltage range proceed as follows:
1. Ensure that the instrument is disconnected from the AC supply.
2. Remove the screws holding the case upper and handle.
3. Lift off the case upper.
4. The transformer primary taps are clearly marked:
A 0-110-120 B 0-110-120
Rewire as follows:
240V operation: Neutral (blue) wire to A0
Link (red) wire from A120 to B0
Live (brown) wire to B120
220V operation: Neutral (blue) wire to A0
Link (red) wire from A110 to B0
Live (brown) wire to B110
120V operation: Neutral (blue) wire to A0
Link (black) wire from A0 to B0
Link (red) wire from A120 to B120
Live (brown) wire to B120
110V operation: Neutral (blue) wire to A0
Link (black) wire from A0 to B0
Link (red) wire from A110 to B110
Live (brown) wire to B110
Note: Units factory set to 220 or 240V will have no black link wire - this must be provided when
converting to 110/120V operation. When converting a 110/120V unit to 220/240V the black link
wire should be discarded.
5. Reassemble in the reverse order.
6. Change the fuse type if necessary.
Important Note: IEC 348 Safety Regulations state that the AC line voltage to which the apparatus
is set must be clearly marked on the outside. If the line voltage setting is changed, it is imperative
that the voltage marked on the label close to the power lead entry point is also changed.
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