43
The Model 3501 Optical Chopper can operate at 100, 120 , 220, or 240 V AC at
AC frequencies of 47-63 Hz. The unit is configured at the factory for the stan-
dard AC voltage in the purchaser’s country. To select a different operating volt-
age, please refer to Fig. 7 (page 44) and follow the directions below:
1. Disconnect the power cord.
2. Open the cover of the power entry module on the rear panel with
a small-blade screwdriver or similar tool.
3. Insert the tool into the voltage selection slot and remove the wheel from
the unit.
4. Turn the wheel and re-insert into the module so the desired voltage is
shown. Do not attempt to rotate the wheel while it is still in the power
entry module; the wheel must be removed, turned, and then re-inserted.
5. Close the cover.
6. Verify that the proper voltage is showing through the module’s window.
X
AC
Operating
Voltages
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