Model 8640B TM 9-4935-601-14-7&P
PERFORMANCE TESTS
4-35. PEAK INCIDENTAL PHASE MODULATION TEST (Cont'd)
6. Set Signal Generator's RANGE to 64 128 MHz, FREQUENCY TUNE to 128 MHz and repeat steps 3 through 5
(except set vector voltmeter frequency range to 80 150 MHz). The voltmeter's phase meter should indicate less than
+8.6° of deviation (maximum).
----------+8.6
o
7. Disconnect instrument from the line power source. Remove test cables, reconnect cable W7 to jack A26W3 and
replace bottom cover. Connect instrument to line power source. Allow one hour warm-up time before continuing with
this test.
8. Check Signal Generator for correct RF output on each frequency range.
WARNING
Capacitors inside the instrument may still be charged even if the instrument has been
disconnected from its line power source.
4-36. PULSE MODULATION TEST
SPECIFICATION:
Pulse Modulation (specifications apply for top 10 dB of output vernier range):
Frequency
Bands (MHz)
0.5 - 1 1 - 2 2 - 8 8 - 32 32 - 512
Rise and Fall
Times
<9 µs <4 µs <2 µs <1 µs
Pulse
Repetition
50 Hz to'50 kHz 50 Hz to 100 kHz 50 Hz to 250 kHz 50 Hz to 500 kHz
Rate
Pulse Width
Minimum for
Level Accuracy
within 1 dB
10 us 5 is 2 us
of CW (>0.1%
duty cycle)
4-56
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