Model 8640B TM 9-4935-601-14-7&P
PERFORMANCE TESTS
4-21. RESIDUAL AM TEST (Cont'd)
Meter Function .....................................................................................................................................LEVEL
COUNTER MODE: EXPAND...................................................................................Off
LOCK........................................................................................Off
Source ..................................................................................... INT
AM............................................................................................................................................................. INT
MODULATION ................................................................................................................................... Full ccw
MODULATION FREQUENCY.............................................................................................................1000 Hz
FM............................................................................................................................................................OFF
RANGE .................................................................................................................................... 256 - 512 MHz
FREQUENCY TUNE .........................................................................................................................500 MHz
OUTPUT LEVEL...................................................................................................... +13 dBm (Vernier full cw)
RF ON/OFF................................................................................................................................................ON
2. Set Meter Function to AM and slowly turn Signal Generator's MODULATION control clockwise until its panel meter
indicates 10% AM. Note voltmeter reading in dB.
3. Set generator's AM switch to OFF. The residual AM should read >58 dB below the reference noted in step 2 (i.e.,
>78 dB down). (The 10% AM, after detection, is 20 dB below the carrier level. Residual AM is then 20 dB -78 dB
= -58 dB.)
58 dB ___________________________
4. Replace the 15 kHz LPF with the 3 kHz LPF. Add the capacitor between amplifier and filter and repeat steps 1
through 3. The residual AM should read >65 dB below the reference noted in step 2 (i.e., > 85 dB down).
65 dB ___________________________
4-22. RESIDUAL FM TEST
SPECIFICATION:
Residual FM: (Averaged rms)
CW and up to 1/8 maximum Up to maximum allowable
allowable peak deviation peak deviation
Post-detection
300 Hz 20 Hz 300 Hz 20 Hz
Noise
to to to to
Bandwidth
3 kHz 15 kHz 3 kHz 15 kHz
230 to 550
<5 Hz <15 Hz <15 Hz <30 Hz
MHz
4-21
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