IFR FM/AM-1200A

4-6-6 VARIABLE GENERATE
This feature allows the generator to be moved off center frequency a
minimum
of ±10 kHz and the EXT MOD Connector (15) to be used for DC
coupling.
STEP
PROCEDURE
1. Set front panel controls to the positions listed in Table 4-6.
2. (FM/AM-1200S only). Position HORIZONTAL Sweep Selector Control
(26) to "10 kHz/Div'' and center display using HORIZ POS Control
( 3 0 ) •
3. Rotate GEN/LOCK Control (32) out of the ''LOCK" (detent) position
and observe generator frequency change on FREQ ERROR Meter (36)
and analyzer display (FM/AM-1200S only).
4. Place GEN/LOCK Control (32) to "LOCK'' (detent) and observe that
FREQ ERROR Meter (36) goes back to zero and analyzer display is
centered (FM/AM-1200S only).
4-6-7 MEASURING UUT RECEIVER SINAD SENSITIVITY
STEP PROCEDURE
------------------------------------------------------------------------
1. Connect 50n coaxial cable between FM/AM-1200S/A T/R Connector
(11) and RF input of receiver under test.
jNOTE]
For UUT SINAD measurements, the FM/AM-1200S/A
internal tone generator (fixed) should be used
as a modulation source. A modulation frequency
of 1000.0 Hz is required.
2. Connect audio output of receiver under test to EXT/MOD/SINAD
Connector (15) and place Modulation METER Control (4) to "SINAD"
position.
3. Adjust RF Level Attenuator Control (9) for an output level of
5 00 11 v.
4. Slowly decrease FM/AM-1200S/A RF output level until MODULATION
Meter (1) displays desired SINAD value.
[NOT~~
The setting of RF Level Attenuator Control (9)
and RF Level Attenuator Vernier Control (10)
represents SINAD sensitivity of receiver under
test.
4-39
05