Model 8640B TM 9-4935-601-14-7&P
PERFORMANCE TESTS
4-40. FM SENSITIVITY AND ACCURACY TEST (Cont'd)
6. To check indicated accuracy, set test Signal Generator's RANGE control to 256 512 MHz and FREQUENCY TUNE to
500 MHz. Set reference signal generator for a 501 MHz, CW signal at +13 dBm. Set test generator's FM switch to
OFF and tune both generators for a 1 MHz signal at the top graticule line on the analyzer's display.
7. Set test signal Generator's FM switch to AC, set test oscillator's frequency for approximately 2.079 kHz, and adjust
oscillator's amplitude controls for a reading of 5 (i.e., 5 kHz) on test generator's panel meter (O 5 scale). Tune
oscillator's frequency for the first carrier null on the analyzer's display (at least 50 dB below the top graticule line).
With frequency counter, measure frequency of modulating signal. It should be 2.079 kHz + 10%.
1.871 2.287 kHz
8. Use procedures given in steps 6 and 7 to check indicated accuracy on the remaining bands by setting test generator's
RANGE switch as shown below. On each range, set FM to OFF and tune generators for a 1 MHz difference. Set
reference on analyzer, set FM to AC (with modulating signal's amplitude set for a test generator panel meter reading
of 5 and its frequency set to approximately 2.079 kHz). Then tune modulating signal's frequency for first carrier null.
The signal's frequency should be as shown.
RANGE FREQUENCY Reference Generator Mod. Signal Frequency
(MHz) TUNE Frequency (kHz)
128-256 256 MHz 257 MHz 1.871___________ 2.287
64-128 128 MHz 129 MHz 1.871___________ 2.287
32-64 64 MHz 65 MHz 1.871___________ 2.287
16-32 32 MHz 33 MHz 1.871___________ 2.287
8-16 16 MHz 17 MHz 1.871___________ 2.287
4-8 8 MHz 9 MHz 1.871___________ 2.287
2-4 4 MHz 5 MHz 1.871___________ 2.287
1-2 2 MHz 3 MHz 1.871___________ 2.287
9. Disconnect test Signal Generator and analyzer from mixer and connect test generator directly to analyzer. Set
RANGE to 0.5 1 MHz, FREQUENCY TUNE to 1 MHz, FM to OFF, and reset reference on analyzer's display. Set FM
to AC (with modulating signal's amplitude set for a test generator panel meter reading of 5 and its frequency set to
approximately 2.079 kHz). Then tune the signal's frequency for the first carrier null. The signal's frequency should be
2.079 kHz + 10%.
1.871 2.287 kHz
4-67
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