Rohde & Schwarz ZVB 4 - Determining Which Boards Are Defective; Performance Test

Instrument Construction and Function Description R&S ZVB
1145.1078.82 3.68 E-4
Determining which Boards are defective
T
he table below lists boards that are probably defective based on the faults that occurred during the
performance test.
Defective board
Problem with: Probable Also possible
Frequency accuracy Frequency reference
SSB phase-noise Only one port
All ports
Synthesizer1
Frequency reference
Level accuracy Only one port
All ports
Reflectometer associated with defective port
Synthesizer1
Max. output level Only one port
All ports
Reflectometer associated with defective port
Synthesizer1
Absolute accuracy wave quantity a Reflectometer associated with defective port
Level linearity Reflectometer associated with defective port
Harmonic ratio Reflectometer associated with defective port Synthesizer1
Spurious suppression Synthesizer1
Matching portx Bridge unit of reflectometer associated with the
defective port
Directivity portx Bridge unit of reflectometer associated with the
defective port
Receiver absolute accuracy Port 1, 2
Port 3, 4
All ports
Reflectometer associated with defective port
Reflectometer associated with defective port
Synthesizer1
Network controller1
Network controller2
Frequency reference
Receiver linearity for high levels Portx
All ports
Reflectometer associated with defective port
LO divider
LO divider
Synthesizer2
Receiver linearity for low levels Port1, 2
Port3, 4
Network controller1
Network controller2
Receiver noise level portx Reflectometer associated with defective port Synthesizer2 or
synth.1 for 2-port models
Dynamic range portx Reflectometer associated with defective port
(see Circular 10028)
Synthesizer2 or.
synth.1 for 2-port models
DC measurement input1V Motherboard Network controller1
DC measurement input 10V Motherboard Network controller1
Frequency reference input/output Frequency reference
Accuracy on S-parameter measurements
depending on meas. bandwidth
See Circular 10029
A board test should be performed before the board that has been deduced to be defective is replaced.