Measurement Computing DAC488 v.1 - Manual (Page 20)

14 DAC488 Power & Assembly DAC488 User’s Manual
Power Line & Fuse Configuration
The power configuration of the DAC488 unit consists of selecting the line voltage and replacing the fuses.
Each DAC488 unit has a factory default to operate at 105-125 volts AC. However, each unit may be
operated at either 105-125 or 210-250 VAC.
WARNING WARNING WARNING WARNING
Do not use the DAC488 unit outdoors! The unit is intended for indoor use only!
Outdoor conditions could result in equipment failure, bodily injury or death!
WARNING WARNING WARNING WARNING
Never disassemble the DAC488 case while it is connected to the AC power line, or
when analog output terminals are connected to a device exceeding 60 VDC or 30 Vrms
common mode voltage! Internal voltage potentials exist which could cause bodily
injury or death!
To change the operating voltage of the DAC488 unit, it is necessary to open the enclosure. However,
before modifying the voltage, disconnect any input or output connections from the rear panel of the affected
unit and then disconnect the power cord from the power line terminal.
Line voltage must be set for 105-125 or 210-250 VAC to match the power being supplied to the DAC488
unit. If the line voltage is changed, the fuse must also be changed. Refer to the following text for the line
voltage switch and fuse locations.
Line Voltage Selection
CAUTION CAUTION CAUTION CAUTION
Service: This product contains no operator serviceable parts, or operator replaceable
parts within the case. Fuse replacement and the changing of selected line voltage must
be performed by qualified service personnel. Never open the DAC488 case while it is
connected to the AC line, or when analog output terminals are connected to a device
exceeding 60 VDC or 30 Vrms common mode voltage. Contact with voltage potentials
could cause bodily injury or death!
As already mentioned, the DAC488 may be operated with 105-125 or 210-250 VAC, 50-60 Hz power, as
set by its internal line-voltage switch (labelled S104). Each unit is shipped from the factory with this
operating voltage setting marked on its rear panel. If this is not the appropriate power setting to be supplied
to the unit, then the line voltage and power fuse must be changed to avoid damage to the unit. The line-
voltage selection procedure is outlined in the following steps.