Model 8640B TM 9-4935-601-14-7&P
PERFORMANCE TESTS
4-36. PULSE MODULATION TEST (Cont'd)
DESCRIPTION:
A pulse generator is used to pulse modulate the Signal Generator. The RF pulse output is detected and displayed and
measured on an oscilloscope. For RF outputs above 32 MHz, a reference signal generator and a mixer are used to
down-convert the signal to within the range of the oscilloscope.
NOTE
If a high frequency oscilloscope is available, such as the HP 183C/1830A/1840A, the above
measurement may be made directly to frequencies slightly beyond the oscilloscope's nominal
bandwidth. Use the oscilloscope's 5092 input.
Figure 4-22. Pulse Modulation Test Setup
EQUIPMENT:
Reference Signal Generator.................................................................HP 8640A
Mixer..................................................................................................HP 10514A
50 Ohm Load ....................................................................................HP 11593A
Pulse Generator ..................................................................................HP 8003A
Oscilloscope.....................................................................HP 180A/1801A/1820C
Crystal Detector ..................................................................................HP 8471A
NOTE
The reference signal generator should have a frequency range of 20 500 MHz with an output of
+7 dBm.
4-57
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