Service Guide E8364-90026
4-37
PNA Series Microwave Network Analyzers
Troubleshooting
E8362B, E8363B, E8364B
Measurement System Troubleshooting
Node Descriptions, A10 Frequency Reference Board
Node 211
100 MHz Tune
Node 211 senses the tune voltage that phase locks the
100 MHz VCO. The tune voltage is set by referencing the 100 MHz VCO to
the internal 10 MHz OCXO or to the 10 MHz EXT REF.
Node 212
100 MHz Level
Node 212 senses the average voltage output level of the
100 MHz VCO phase locked reference signal.
Node 213
99.50 MHz Tune
Node 213 senses the tune voltage that phase locks the
99.50 MHz VCO. The tune voltage is set by referencing the 100 MHz VCO.
Node 214
99.50 MHz Level
Node 214 senses the average voltage output level of the
99.50 MHz reference VCO.
Node 215
External Reference Detect
Node 215 senses a TTL signal which is used
to set the reference frequency switch. The node registers a low TTL voltage
when the internal 10 MHz OCXO signal is used or a high TTL voltage when
the external 10 MHz EXT REF is used.
Node 216
Phase Lock Average Voltage
Node 216 senses the average voltage of the
8.333 MHz phase lock reference signal that is routed to the A11 phase lock
board. This voltage is constant through all bands.
Node 217
500 kHz Level
Node 217 senses the average voltage of the 500 kHz phase
lock reference signal.
Node 218
33.1667 MHz 2nd LO Average Voltage
Node 218 senses the average
voltage of the 33.1667 MHz 2nd LO signal that is routed to the A35 receiver
motherboard. This voltage is constant through all bands.
Node Descriptions, A11 Phase Lock Board
Node 311
NC
Node 311 is not used in this product.
Node 312
100 kHz Phase Detector
Node 312 senses the average voltage of the
phase comparator at the output of a 700 kHz low-pass filter.
Node 313
NC
Node 313 is not used in this product.
Node 314
100 kHz Phase Detector Integrator
Node 314 senses the tune voltage
that phase locks the source. The integrator that supplies this signal receives
its input from the 700 kHz phase detector (Node 312).
Node 315
1V/GHz YTO Drive Voltage
Node 315 senses the YIG-tuned oscillator
drive voltage which sweeps at 1V/GHz.
Node 316
YTO Drive Current
Node 316 senses the YIG-tuned oscillator drive
current.
Node 317
YTO Tune Compensation
Node 317 senses the voltage output of the YTO
tune compensation summation node.
Node 318
Ground
Node 318 is connected to digital ground to serve as a
measurement reference.
Summary of Contents for E8362B
Page 11: ...Service Guide E8364 90026 1 1 1 Safety and Regulatory Information ...
Page 19: ...Service Guide E8364 90026 2 1 2 General Product Information ...
Page 33: ...Service Guide E8364 90026 3 1 3 Tests and Adjustments ...
Page 83: ...Service Guide E8364 90026 4 1 4 Troubleshooting ...
Page 151: ...Service Guide E8364 90026 5 1 5 Theory of Operation ...
Page 185: ...Service Guide E8364 90026 6 1 6 Replaceable Parts ...
Page 269: ...Service Guide E8364 90026 7 1 7 Repair and Replacement Procedures ...
Page 351: ...Service Guide E8364 90026 8 1 8 General Purpose Maintenance Procedures ...