Service Guide N5230-90014 4-35
PNA Series Microwave Network Analyzers Troubleshooting
N5230A Measurement System Troubleshooting
Node 718 SOMA 50 Prelevel DAC Node 718 senses the prelevel DAC voltage
applied to the output of the source ALC circuitry upon analyzer startup to
preset the output level of the SOMA 50.
Node Descriptions, A16 Test Set Motherboard, AUX 2
Node 811 −10 V Reference Node 811 senses the −10 V supply voltage that serves as
a measurement reference.
Node 812 +1.78 V Bias Reference Node 812 senses the +1.78 V bias supply voltage
that serves as a measurement reference.
Node 813 Phase Lock IF Detector Node 813 senses the voltage input to the phase
lock IF detector.
Node 814 +10 V Reference Node 814 senses the +10 V supply voltage that serves as
a measurement reference.
Node 815 −1.25 V Bias Reference Node 815 senses the −1.25 V bias supply voltage
that serves as a measurement reference.
Node 816 +5 V Reference Node 816 senses the +5 V supply voltage that serves as a
measurement reference.
Node 817 Logger Drive Voltage Output Node 817 senses the drive voltage applied
to the source ALC log amp.
Node 818 Detector Voltage Output Node 818 senses the output voltage of the
phase lock IF detector.
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