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.
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