426 Chapter10
Analyzer Options and Block Diagrams
First LO Distribution Amplifier (LODA) 8593E, 8594E, 8594Q, 8595E, 8596E Option 009
TREE 3: Option 190
HOW DO I CHECK THE BASIC CONFIGURATION?
Comments Problems/Reasons Diagnostic/Fix Action
The Option 190 consists of three
card-cage option cards, DSP
firmware, host analyzer firmware,
and the DLP. All revisions must
be up to date.
Access the option listing under
Show Options. Confirm that the
option software revisions are
current, and that no configuration
error message shows. The following
is a list of the initial revisions.
• Firmware: 961216
• DLP: 961218
• Option 190 DSP: 961206
If you get a configuration error,
refer to the “Error Messages”
section of the 8594Q Option 190
DVB-C QAM Analyzer User's Guide.
WHICH OPTION 190 TEST FAILED?
Comments Problems/Reasons Diagnostic/Fix Action
The Option 190 Recalibration
routine or DVB Demod Test
exercises both the Option 190
hardware, and the base spectrum
analyzer platform hardware in
different tests.
If the Option 190 Recalibration
routine or DVB Demod Test fails the
EVM test limit, the problem is most
likely in the Option 190
hardware/software or the DLP. Go
to TREE 4. If the Option 190
Recalibration routine or DVB
Demod Test fails the average power
limit, the problem is most likely in
the basic spectrum analyzer
platform hardware, the
preamplifier, or the DLP. Go to
TREE 5.
IS THE ANALYZER RECEIVING A GOOD INPUT SIGNAL?
The test signal comes from the
8770 arbitrary waveform
synthesizer. It is very sensitive to
improperly connected or
terminated cables.
View the spectrum on a spectrum
analyzer screen. It is centered at
27.6 MHz. Refer to the “Average
Channel Measurement” located in
the “Making Measurements”
chapter of the 8594Q Option 190
DVB-CQAM Analyzer User's Guide,
for an example of the correct signal
shape. The bandwidth depends on
the exact test being performed, but
the signal will be of the same shape
as the example.
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