Service Guide 7-27
8719ET/20ET/22ET Source Troubleshooting
8719ES/20ES/22ES Broadband Power Problems
RF Network Analyzers
For 8722ET/ES
• If you measure at least −8 dBm (−3 dBm on ET models and ES Option 007 models) at
the port, replace the A59 source interface board assembly.
For ES Models Only
• If you measure less than −8 dBm (−3 dBm on Option 007 models) at the port, press
and or and measure power at
the other port.
• If you measure less than −8 dBm (−3 dBm on Option 007 models) at the other port,
continue with “Step Attenuator (A69) Check” next.
• If you measure at least −8 dBm (−3 dBm on Option 007 models) at the other port,
either the directional coupler or the bias tee or the transfer switch (A25) is faulty.
The power loss through each of these components should be negligible.
Step Attenuator (A69) Check
1. Measure the input and output power of the step attenuator; the loss should be
negligible if the attenuator is set to 0 dB.
2. If the 5 dB attenuation steps seem inconsistent, perform the “Step 2. Operator’s Check”
on page 4-7.
Meas
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