Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide 247
Baseband Generators
A2 Vector BBG Assembly Troubleshooting
If the 100 MHz reference signal is missing the instrument will give many error
messages when the instrument is powered on. These will be errors such as:
-240,"Hardware error;BBG clock generator error: Internal VCO is unlocked"
-240,"Hardware error;BBG clock generator error: Internal 800 MHz clock
missing"
-310,"System error;The 656 option cannot be configured. Required
hardware is missing."
+617,"Configuration Error;BBG memory configuration does not match
model number: required 4 GB was not found."
The instrument will also not be able to identify the A2 Vector BBG assembly in
the Installed Board Info screen if the 100 MHz signal is missing.
To isolate the cause of a 100 MHz reference signal issue:
1. Verify that there are no Reference or Synthesizer Unlocked error
messages. If there are any, see “Unlocked Issues” in Chapter 6,
“Troubleshooting,” and resolve that issue before continuing here.
2. Referring to Figure 12-2, remove W6 and connect a spectrum analyzer to
A3 J5000.
3. Configure the spectrum analyzer with the following settings:
— Center Frequency = 100 MHz
— Span = 10 MHz
— Reference Level = +10 dBm
4. The 100 MHz reference signal level should be 0 dBm, +/-3 dB.
— If the signal level does not meet the requirement, replace the A3 RF
assembly.
— If the signal level does meet the requirement, inspect and replace
W6 if necessary. If W6 is not at fault, replace the A2 Vector BBG
assembly.
Waveform Memory Issues
The A2 Vector BBG assembly has two 240 pin DIMM slots on it for BBG
waveform memory. Each slot has an A2A1 2 GB memory module in them (only
one for N5166B and N5172B instruments). If there are any error messages
related to the BBG memory at power up, such as the following, replace the
A2A1 Vector BBG Assembly Memory modules:
+617,"Configuration Error;BBG memory configuration does not match
model number: required 4 GB was not found."
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