Measurement Computing Digital488/80A - Manual (Page 27)

Note: If disassembly or disconnection is necessary, first turn off the power, next disconnect the AC
power line, and then any other cables, prior to disassembly.
To Select the Line Voltage
1. Turn off the power. Next, disconnect the AC power line cord, and then all other test cables from the
unit.
2. Place the unit on a flat surface. Remove the four screws on top of the case and remove the top cover.
3. Located next to the main power supply transformer is the line voltage selection switch (labeled S4).
Using a small screwdriver, insert the tip of the screwdriver into the slot of the switch and slide the
switch to the left or right until it "clicks" into place with the desired line voltage selection visible.
CAUTION
voltage selection swi
It is possible to place the line voltage switch (S4
cause equipment damage or malfunction. Whe
V or 220 V selection. The switch will “click” into place when properly positioned.
) in a partial position which could
n changing the position of the line
tch (S4), make sure the switch is completely positioned to the 115
4. Install a power line fuse appropriate for the line voltage. See section Fuse Replacement – Step 3,
following this section.
CAUTION
Fuse Failure: Fuse failure indicates a possible problem within the device circuitry. If
a fuse blows, contact a qualified service representative. Replacement fuses are to be
installed by qualified service personnel with the unit disconnected from the power
source and with all other terminals disconnected. If the line voltage selector is
changed, then the fuse designated for that line voltage must be used.
5. Make note of the new voltage setting for later reference.
6. Carefully reassemble the unit.
Note: For re-assembly, first reconnect the AC power line, and then any other cables, prior to reapplying
power to the entire system.
Digital488/80A User’s Manual Digital488/80A Power & Assembly 21