4-34 Service Guide N5230-90014
Troubleshooting PNA Series Microwave Network Analyzers
Measurement System Troubleshooting N5230A
Node 917 2.250 GHz VCO Compensation Node 417 senses the average voltage
output level of the 2.250 GHz VCO.
Node 918 ALC Level Adjust Node 418 senses the voltage that is used to set the
offset on the heterodyne band ALC.
Node Descriptions, A16 Test Set Motherboard, MA
Node 516 −15 V Reference Node 516 senses the −15 Vdc supply voltage that serves
as a measurement reference.
Node 517 +9 V Reference Node 517 senses the +9 Vdc supply voltage that serves as
a measurement reference.
Node 518 +15 V Reference Node 518 senses the +15 Vdc supply voltage that serves
as a measurement reference.
Node Descriptions, A16 Test Set Motherboard, SSLAM
Node 611 Detector Level Node 611 senses the power level of the internal detector
signal from the A22 switch splitter or the power level from the external
detector from the rear panel.
Node 612 Level Output Node 612 senses the output of the detector log amp in the
ALC.
Node 615 Temperature Compensation Node 615 senses the input voltage applied
to the temperature compensation amplifier for the source ALC.
Node 616 Slope Compensation Node 616 senses the slope compensation.
Node 617 Log Amp Collector Voltage Node 617 senses the collector voltage of the
source ALC log amp.
Node 618 Power DAC Node 618 senses the output voltage of the power DAC. This
output is summed with other compensation signals to control the source
output level. The power DAC has the most influence of the compensation
signals.
Node Descriptions, A16 Test Set Motherboard, AUX 1
Node 711 Log Amp Breakpoint 1 Voltage Node 711 senses the breakpoint voltage
for stage 1 of the source ALC log amp.
Node 712 Log Amp Breakpoint 2 Voltage Node 712 senses the breakpoint voltage
for stage 2 of the source ALC log amp.
Node 714 Log Amp Offset Voltage Node 714 senses the offset voltage for the source
ALC log amp.
Node 715 +10 V Reference Node 715 senses the +10 V supply voltage that serves as
a measurement reference.
Node 716 Log Amp Emitter Voltage Node 716 senses the emitter voltage of the
source ALC log amp.
Node 717 Temperature Compensation Node 717 senses the output voltage of the
temperature compensation amplifier for the source ALC.
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