Measurement Computing Extender 488HS Rev.2.0 - Manual (Page 12)

Section 2 Getting Started
2.4
and change the setting of S3. The 1/2 Amp fuse (IOtech part number FU-1-.5) that is used for 115 Volt
operation must be replaced with a 1/4 Amp fuse (IOtech part number FU-1-.25) for 230 Volt operation..
Disconnect the power cord from the AC line and from the Extender488/HS Bus Extender.
Disconnect any IEEE cables prior to disassembly.
F1
S3
S2
WARNING :
LETHAL VOLTAGES
MAY BE PRESENT
115V
Power Connector
Extender488/HS Fuse and Line Voltage Switch Locations
WARNING
Never open the Extender488/HS Bus Extender case while it is connected to the AC
line. Internal voltage potentials exist which could cause personal injury or death.
1. Place the Extender488/HS on a flat surface. Remove the six screws on top of the case and
remove the top cover. Located next to the rear panel power connector is switch S3 and fuse
F1.
2. Using a small screwdriver, insert the tip of the screwdriver into the slot of the switch and
move the switch to the left or right so that the desired line voltage selection appears on the
switch. Make note of the new setting for later reference.
CAUTION
Use the 1/2 Amp fuse, FU-1-.5 for 115 volt operation. Use the 1/4 Amp fuse, FU-1-
.25 for 230 volt operation. Failure to use the correct fuse could result in damage to
the Extender488/HS Bus Extender.