Spurs In The Data Race; Inaccurate Data - Agilent Technologies 8711C Service Manual

Spurs in the Data Trace
Some spurs are unavoidable in this network/tuner analyzer con guration. Most of the
predictable spurs can be eliminated by either using either the Spur Avoid or the Dither option
in the Spur Avoid menu. See your instrument's
location (in MHz) of these spurs can be approximated by the formula:
2340/N where N = 2, 3, 4
Use a spectrum analyzer or power meter to check the output of the source at the RF OU
port to see if the spurs are in the RF output signal. If they are, go to \ roubleshooting Source
Problems."
Perform the \Switched Gain Correction" adjustment in the \Adjustments" chapter of this guide.
If the problem persists, replace the A5 receiver assembly.

Inaccurate Data

Check adapters, cables, and test port connectors for damage. Gauge the test port connectors.
Ensure that the cables between the A4 source and A5 receiver assemblies are properly
connected.
Perform the following receiver corrections found in the \Adjustments" chapter of this guide,
as indicated by where the data problems occur. If the problem is in both narrowband and
broadband mode, refer to the \Adjustments" chapter of this guide to determine the proper
order for performing the adjustments. If the problem is only in broadband mode, the problem
could be bad detector diodes, see \A5 Receiver Assembly Diode Replacement."
Narrowband mode problems:
Broadband mode problems:
If data seems to drift, check the uncorrected performance of the analyzer. Connect a good load
to the RF OU port. Press
ervice Meas Cal Options Meas Cal Off
SYSTEM OPTIONS
5
!
. he marker value should be less than (below)
Mkr Max
connect a through cable between the RF OU and RF IN ports. Press
value should be less than
Receiver Assembly Diode Replacement" earlier in this chapter. Poor test port cables can also
cause drift.
If data is okay with just a through cable connected (after preset), but bad in an application,
check for the following:
4-26 T roubleshoot ng and Block D agrams
etc.
. . .
(see the cautions on pages 4-1 and 4-2)
PRESET
5
0
12 dB. If these are bad, replace the A5 receiver assembly or see \A5
ser's Guide
for more information. he
Switched Gain Correction
B Amplitude Correction
Re ection Correction
Switched Gain Correction
External Detector Correction
R* Amplitude Correction
R* Frequency Response Correction
B* Amplitude Correction
MARKER
0
15 dB. Remove the load and
Reflection
MEAS1
5
Marker earch
5
!
. he marker
Mkr Max