IFR FM/AM-1200A

The oven oscillator (Option 02 only) is powered
by the internal battery when the test set is
switched to battery operation. In the battery
mode, there is no provision for preheating the
oven oscillator. A 15-minute warm-up period is
required, with the test set at room temperature,
in order to stabilize the oven oscillator.
However, the FM/AM-1200S/A will turn on and
operate immediately in the battery mode, but the
oven oscillator frequency will not be within
specifications without the required 15-minute
warm-up period. It is therefore recommended
that the FM/AM-1200S/A be connected to an
external AC or DC power source for the required
15-minute warm-up period.
2-4 GENERAL OPERATING DATA
The FM/AM-1200S/A Communications Service Monitor is shipped with the AC
Power Select Switch (Ref. Figure 2-3) positioned to "115 VAC". If it is
necessary to operate FM/AM-1200S/A using 220 VAC, the AC Power Select
Switch must be positioned to "230 VAC" prior to the application of
electrical power. The procedure to reposition this switch is as
follows:
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Figure 2-3 AC Power Select Switch Location
2-5
02