Check The Test Port Cables - Agilent Technologies 8719ET Service Manual

8719ET/20ET/22ET
8719ES/20ES/22ES
RF Network Analyzers
• If the message PRESS[CONTINUE] appears on the display during the test, that
particular attenuator setting check has failed. Press
other attenuator settings.
• If the message FAIL appears on the analyzer display, the analyzer has failed the
TRANSMISSION port operation check. Refer to the flow charts on
page 2-5.
• If the message DONE appears on the analyzer display, the analyzer has passed the
TRANSMISSION port operation check.

Check the Test Port Cables

A bad cable can cause a failure in the verification test. The following tests are not required,
but are recommended to verify the performance of the test port cable.
• Cable Return Loss, on page 2-9
• Cable Insertion Loss, on page 2-11
• Cable Magnitude and Phase Stability, on page 2-12
NOTE The illustrations depicting the analyzer display were made using an Agilent
8722ES model. Other analyzer displays may appear different, depending on
model and options.
Cable Return Loss
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 "Calibrating for Increased Measurement
Accuracy" 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 2-3.
Service Guide
Preset
Refl: FWD S11 (A/R)
REFLECTION
to find the worst-case return loss. Refer to the
SEARCH: MAX
System Verification and Performance Tests
CONTINUE
.
Preliminary Tests
to check the
page 2-4 and
2- 9