Table of contents
- 1. Details
- 2. Test Setup
- 3. Results
Details
Purpose of the test was to investigate a drop in amplitude of the last 4 BBCs of board C in the PV DBBC3 system. This drop has been seen during the GMVA fringe tests f191a and f192a.
Test Setup
The 4-8GHz noise source was connected to all 4 IF inputs of the DBBC3. The DDC_V 124 was loaded and all 32 BBCs were tuned to the same frequency. A test recording was done.
Prior to the recording the system was checked by the monitorDDC.py script: PPS and samplers were in an OK state.
Results
All baselines to board C show a drop in amplitude between BBC 1-4 and 5-8. In addition the phase on these baselines is not constant. A double peak in the multiband delay suggests that there is a delay of approx. 6 ns between the BBC groups.
| baseline | fringe plot | |
|---|---|---|
| A-B | AB.pdf | |
| A-C | AC.pdf | |
| A-D | AD.pdf | |
| B-C | BC.pdf | |
| B-D | BD.pdf | |
| C-D | CD.pdf |
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