VM700A Option 01 (NTSC) & Option 11 (PAL) User Manual
2-1
Section 2:Installation and Operation
Power Requirements
The VM700A operates with line frequencies from 48 Hz to 66 Hz, over two line
voltage ranges. The nominal setting of the low voltage range is 115 VAC. The
nominal setting of the high voltage range is 230 VAC.
There are two power switches on the VM700A, one on the rear panel above the
power cord receptacle, and one on the front panel. Both must be on to operate
the instrument. The rear-panel switch is the master power switch. The switch on
the front panel remotely enables the voltage supply outputs.
WARNING. Dangerous voltages are present within the Power Supply module
when the rear-panel power switch is on, regardless of the position of the
front-panel power switch. Do not operate the VM700A with any covers removed.
Refer all servicing of the instrument to a qualified service person.
The voltage range selection switch and fuse holder are located in the lower left
corner of the rear panel (see Figure 2-1). The VM700A is shipped from the
factory set for the operating voltage of the destination nation (115 VAC or
230 VAC). If the setting is not correct, it must be changed before connecting the
power cord to the power source. Simply set the voltage range selection switch
(located on the rear panel of the VM700A) to the correct position for operation.
CAUTION. When changing the line voltage selector switch you must also change
the fuse to provide proper protection for the operating voltage in use. The 3A
slow-blow fuse provides the proper protection in the 230 VAC range and the 6A
slow-blow fuse provides protection for operation in the 115 VAC range.
A detachable three-wire power cord with a three-contact plug is provided with
each instrument for connecting to both the power source and protective ground.
The protective-ground connector in the plug connects (through the protective-
ground conductor) to the accessible metal parts of the instrument. For electrical-
shock protection, insert this plug only into a power-source outlet that has a
properly grounded protective-ground contact.
Changing Line Voltage
Range and Fuse
Power Cord
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