Keysight Technologies N5247B, Service Manual

Page: 50 / 566

3-20 Keysight N5247B Service Guide
Tests and Adjustments
Preliminary Checks
3-
If the Cable Magnitude and Phase Stability Check Fails
1. Clean the cable and devices and torque to specification. Repeat the check.
2. If the check still fails, the cable should be repaired or replaced.
Cable Connector Repeatability Check
1. With the test port cable still connected to Port 1, connect a broadband
load to the other end of the cable.
2. Press UTILITY .
3. Press RESPONSE . Verify that is ON. If not, press
the softkey to toggle it ON.
The Averaging Factor box will appear directly above the display. In the
Averaging Factor box, type 100 or click the arrows to select 100, and then
press ENTRY
.
4. Wait for the analyzer to average the measurement 100 times
(approximately five seconds).
5. To normalize the data trace: press MARKER/ANALYSIS , then
, then , then , then ENTRY .
6. To adjust the display scale:
a. Press RESPONSE , then .
The Scale Per Division box will appear directly above the display.
Set the Scale Per Division for 0.5 dB. Press ENTRY
.
b. Press .
The Reference Level box will appear directly above the display. Set
the Reference Level for 0 dB. Press ENTRY
.
7. Disconnect and then reconnect the cable to the test port. Tighten the
connection to the specified torque for the connector type.
8. Press RESPONSE , then .
9. Look at the trace for spikes or modes.
The connector repeatability measurement should be done at the test port
as well as at the end of the test port cable.
Preset
Avg
Average ON/off
Average on/OFF
Enter
Memory
Data Trace Data Math Data/Memory Enter
Scale Scale
Enter
Reference Level
Enter
Avg
Averaging Restart