7-13
(3) Setting
1) Function Generator (HP3325B)
Frequency : 100 Hz
Function : Square wave
Amplitude : 2.5 volts peak to peak
Offset : 0 V
2) 6769B
Frequency : 100 MHz (CW)
Output Level : -10 dBm
Pulse External
3) The spectrum analyzer
Center frequency : 100 MHz
Couple : Independent
Display : Time
RBt : 30 kHz
VBt : 300 kHz
Time Span : 20 ms
Attenuator : 0 dB
7.4.2.1 EXT TRIG Check
(1) Set the spectrum analyzer to :
Trigger, Triggered
Trigger Source, External
(2) Measurement
By changing the trigger level, find the point where sweep is stopped.
Because ±2.5 Volts pulse is entered from the HP3325B, sweep should be stopped near that voltage.
Set DC offset to 1.25 Volts on the HP3325B.
The spectrum analyzer is all right if synchronization is properly performed when EXT input is set to TTL.
7.4 Performance test
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