Verify The Rf Cable - Agilent Technologies 8719ET Service Manual

Accessories Troubleshooting
Inspect the Error Terms

Verify the RF Cable

The load match error term is a good indicator of cable problems. You can further verify a
faulty cable by measuring the reflection of the cable.
1. Press
PRESET: FACTORY
Preset
2. Perform a one-port calibration on PORT 1 (REFLECTION port on ET models). For
detailed calibration procedures, refer to the "Optimizing Measurement Results" chapter
in the analyzer user's guide.
3. Connect the test port cable to PORT 1 (REFLECTION port on ET models). Connect a
broadband load to the other end of the cable. Tighten to the specified torque for the
connector type.
4. To measure return loss, press the following:
ES models:
Meas
ET models:
Meas
5. Press
Marker Search
cable manual to see if it meets the return loss specification. If not, the cable should be
either repaired or replaced. For an example of a typical return loss measurement,
see Figure 9-1.
Figure 9-1 Typical Return Loss Measurement of Test Port Cables
9-6
Preset
Refl: FWD S11 (A/R)
REFLECTION
to find the worst-case return loss. Refer to the
SEARCH: MAX
.
8719ET/20ET/22ET
8719ES/20ES/22ES
RF Network Analyzers
Service Guide