Inspect The Error Terms - Agilent Technologies 8719ET Service Manual

Accessories Troubleshooting

Inspect the Error Terms

Inspect the Error Terms
Error terms are a measure of a "system": a network analyzer, calibration kit, and any
cables used. As required, refer to
• The specific measurement calibration procedure used to generate the error terms.
• The routines required to extract error terms from the instrument.
• Typical error term data.
Use Table 9-1 to cross-reference error term data to system faults.
Table 9-1 Components Related to Specific Error Terms
Component
Calibration Kit
load
open/short
Analyzer
coupler
bias tee
transfer switch
step attenuator
sampler
A10 digital IF
test port
connectors
External cables
* This component is likely to contribute to crosstalk at 4 GHz.
If you detect problems using error term analysis, use the following approach to isolate the
fault:
1. Check the cable by examining the load match and transmission tracking terms. If those
terms are incorrect, go to
2. Verify the calibration kit devices:
• Loads: If the directivity error term looks good, the load and the test port are good.
On ES models, if directivity looks bad, connect the same load on the other test port
and measure its directivity. If the second port looks bad, as if the problem had shifted
with the load, replace the load. If the second port looks good, as if the load had not
been the problem, troubleshoot the first port.
9-4
Chapter 11 , "Error Terms,"
Directivity Source
Match
X
X
X X
X
X
X
X X
"Verify the RF Cable" on page
for the following:
Reflection Isolation
Tracking (Crosstalk)
X
X
X X
X X
X X
X
X *
X
X
X X
9-6.
8719ET/20ET/22ET
8719ES/20ES/22ES
RF Network Analyzers
Load Transmission
Match Tracking
X
X X
X X
X X
X X
X
X X
X X
Service Guide