Service Guide N5230-90014 4-33
PNA Series Microwave Network Analyzers Troubleshooting
N5230A 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 215 External Reference Detect Node 215 senses a TTL signal that 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 Descriptions, A7 Fractional-N Synthesizer Board
Node 411 +5 Vdc Supply Voltage Node 411 senses the 5 Vdc supply voltage that
serves as a measurement reference.
Node 412 1.5 to 3.0 GHz VCO Compensation Node 412 senses the average voltage
output level of the 1.5 to 3.0 GHz VCO.
Node 413 1.5 to 3.0 GHz VCO Tune Voltage Node 413 senses the average voltage
input level of the 1.5 to 3.0 GHz VCO.
Node 414 Heterodyne Band ALC Level Node 414 senses the ALC output voltage
that is used to level the heterodyne circuit output for band 1.
Node 415 2.250 GHz VCO Tune Voltage Node 415 senses the average voltage input
level of the 2.250 GHz VCO.
Node 416 Fundamental and Divide-by-2 Band ALC Level Node 416 senses the
ALC output voltage that is used to level the heterodyne circuit output for
bands 2-25.
Node 417 2.250 GHz VCO Compensation Node 417 senses the average voltage
output level of the 2.250 GHz VCO.
Node 418 ALC Level Adjust Node 418 senses the voltage that is used to set the
offset on the heterodyne band ALC.
Node Descriptions, A9 Fractional-N Synthesizer Board
Node 911 +5 Vdc Supply Voltage Node 411 senses the 5 Vdc supply voltage that
serves as a measurement reference.
Node 912 1.5 to 3.0 GHz VCO Compensation Node 412 senses the average voltage
output level of the 1.5 to 3.0 GHz VCO.
Node 913 1.5 to 3.0 GHz VCO Tune Voltage Node 413 senses the average voltage
input level of the 1.5 to 3.0 GHz VCO.
Node 914 Heterodyne Band ALC Level Node 414 senses the ALC output voltage
that is used to level the heterodyne circuit output for band 1.
Node 915 2.250 GHz VCO Tune Voltage Node 415 senses the average voltage input
level of the 2.250 GHz VCO.
Node 916 Fundamental and Divide-by-2 Band ALC Level Node 416 senses the
ALC output voltage that is used to level the heterodyne circuit output for
bands 2-25.
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