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.
Summary of Contents for E8362B
Page 11: ...Service Guide E8364 90026 1 1 1 Safety and Regulatory Information ...
Page 19: ...Service Guide E8364 90026 2 1 2 General Product Information ...
Page 33: ...Service Guide E8364 90026 3 1 3 Tests and Adjustments ...
Page 83: ...Service Guide E8364 90026 4 1 4 Troubleshooting ...
Page 151: ...Service Guide E8364 90026 5 1 5 Theory of Operation ...
Page 185: ...Service Guide E8364 90026 6 1 6 Replaceable Parts ...
Page 269: ...Service Guide E8364 90026 7 1 7 Repair and Replacement Procedures ...
Page 351: ...Service Guide E8364 90026 8 1 8 General Purpose Maintenance Procedures ...