Service Guide E8364-90026 4-39
PNA Series Microwave Network Analyzers Troubleshooting
E8362B, E8363B, E8364B Measurement System Troubleshooting
Node Descriptions, A16 Test Set Motherboard, SOMA 50
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 613 ALC Output Node 613 senses the output of the ALC integrator. The
output of the ALC integrator is the combined voltage output of all
compensation circuits in the ALC. The voltage level varies with frequency
and output power.
Node 614 1V/GHz Compensation Node 614 senses the inverse of the −1V/GHz
signal that comes from the A11 phase lock board. The −1V/GHz compensates
for first-order power changes of the YIG oscillator with respect to frequency.
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 713 1V/GHz Compensation Node 713 senses the input voltage applied to the
1V/GHz compensation amplifier for the LO ALC.
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 which 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.
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.
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