Step Attenuator (A69) Check - Agilent Technologies 8719ET Service Manual

8719ET/20ET/22ET
8719ES/20ES/22ES
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
Refl: REV S22 (B/R)
Meas
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"

• 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
on page 4-7.
Service Guide
or
Refl: FWD S11 (A/R)
next.
Source Troubleshooting
Broadband Power Problems
and measure power at
"Step 2. Operator's Check"
7- 27