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Operating Information
2–2
AM700 Audio Measurement Set Service Manual
The voltage range selection switch and fuse holder are located in the lower left
corner of the AM700 rear panel (see Figure 2–1). The AM700 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.
1. Turn off the rear-panel power switch and disconnect the power cord from the
mains supply.
2. Set the voltage range selection switch (located on the rear panel of the
AM700) to the correct position for operation.
Instruments are shipped with the power cord most appropriate for the country of
destination. Available power-cord option information is given in the Options
section. Contact your Tektronix representative or local Tektronix field office for
additional power-cord information.
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 mains fuse provides protection in the event of a major failure of the
AM700 power supply. Two sizes of fuses are specified, one for 115 V
operation and the other for 230 V operation. See the Fuse specification in
Appendix A for the correct fuse rating to use for each voltage range.
3. Replace the fuse with the correct one, as indicated on the rear panel, for the
new mains voltage selection.
CAUTION. Use only the power cord and connector specified for your product.
Use only a power cord that is in good condition with a proper safety ground
connector.
4. Replace the power cord with the correct one for use with the local mains
outlets.
5. Turn on the rear power switch, then the front power switch to operate the
AM700.
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. The voltage to ground from either
pole of the power source must not exceed 250 V
RMS
. For electric-shock protec-
Changing Line Voltage
Range and Fuse
Power Cord