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reference input respectively. If the frequency accuracy significantly changes, it shall be determined that 100
MHz reference ring has fault, and the IF channel plate shall be replaced.
3. Please replace the frequency synthesis board if the fault still exists.
3.5 No signal detected when the pan smaller than 5MHz, but normal when the span is larger
than 10MHz
Fault cause: The frequency synthesis board has output fault.
Instrument to be repaired: Synthetic signal generator S1465H.
Repair method:
1. Eliminate the cable connection problem.
2. Replace the frequency synthesis board.
3.6 Large deviation between the signal amplitude of a certain wave band and the actual
condition
Fault cause: The microwave/millimeter-wave frequency conversion module has output fault.
Instrument to be repaired: Synthetic signal generator S1465H.
Repair method:
1. Eliminate the cable connection fault.
2. Replace the microwave/millimeter-wave frequency conversion module.
3.7 SWR deviation at input port
Fault cause: The RF front end connection has fault or the connection cable has fault.
Repair method:
1. Check if the connection cables between the RF input connector, blocking module and
programmable step attenuator are reliable or loose.
2. Please replace the blocking module and the connecting semi-rigid cable if the abnormality still exists.
3.8 Phase noise deviation
Fault cause: The IF channel plate or frequency synthesis board has fault.
Instrument to be repaired: Synthetic signal generator S1465H.
Repair method:
1. Replace the IF plate, and verify whether 100 MHz reference ring has any problem or not.
2. If the fault is irrelated to the IF plate, it shall be deemed that the frequency synthesis board has local
