Agilent Technologies PSG Series Service Manual page 73

Troubleshooting
Troubleshooting the RF Path
Troubleshooting Problems >3.2 GHz
11. If the pulse modulation problem occurs >3.2 GHz, remove the cable A30 Modulation Filter J7 (W17). Probe
the end of the cable. Compare the results with Table1-38.
Table 1-38
Pulse On Pulse Off
+5 Vdc 0 to +5 Vdc (pulses at modulation rate)
12. If the signal levels are good, replace the A30 Modulation Filter.
13. if the signal levels are bad, replace the A11 Pulse/Analog Modulation Generator.
1-60