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| Identify the origin(s) of the "acceleration" problem in MAMBO2 | Identify the origin(s) of the "acceleration" problem in MAMBO2. We want to answer the following questions: * Is the acceleration problem due to a mechanical or electrical process ? * What is the influence of the driving program on its intensity (Basic/Cascade) ? |
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| Inclinometer installed on the Mambo2 platform | * Inclinometer installed on the Mambo2 platform |
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| ---------- * On-off measurements on an absorber. The on-off are done w/o the wobbler taking offset in azimuth and elevation to activate the Basic or Cascade controller. The Basic/Cascade limits are (600,400) arcsec in (Azimuth,Elevation). The Basic controller has a smoother behavior than the Cascade controller. |
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[[BR]] |
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| * On-off measurements with the offsets in eleveation: 360" (scan 47, Cascade) and 440" (scan 50, Basic) | * On-off measurements with the offsets in elevation: 360" (scan 47, Cascade) and 440" (scan 50, Basic) |
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| * Measurements of electrical peak with the oscilloscope during an on-off measurements with the offsets in elevation (scan 53). No correlation was found between the beginning of the scans where the extra noise peaks appeared and the electric activity. A peak frequency of 5 sec was observed but which may be related to the air conditioned system. |
Tests performed during the heavy maintenance (2007.06.20)
Goals
Identify the origin(s) of the "acceleration" problem in MAMBO2. We want to answer the following questions:
- Is the acceleration problem due to a mechanical or electrical process ?
- What is the influence of the driving program on its intensity (Basic/Cascade) ?
People
Pico Veleta: DJ, SL, SN, JP
Methods
- Inclinometer installed on the Mambo2 platform
attachment:inclinometerPhoto.jpg
- On-off measurements on an absorber. The on-off are done w/o the wobbler taking offset in azimuth and elevation to activate the Basic or Cascade controller.
The Basic/Cascade limits are (600,400) arcsec in (Azimuth,Elevation). The Basic controller has a smoother behavior than the Cascade controller.
Results
- Inclinometer measurements for two on-off measurements with the Cascade and the Basic controller.
BR attachment:inclinometerBolo.jpg
- On-off measurements with the offsets in elevation: 360" (scan 47, Cascade) and 440" (scan 50, Basic)
BR Cascade controller attachment:scan47-elev-cascade.jpg
Basic controller attachment:scan50-elev-basic.jpg
- An extra weight was put on the bolometer platform (scan 51)
attachment:scan51.jpg
- Measurements of electrical peak with the oscilloscope during an on-off measurements with the offsets in elevation (scan 53).
No correlation was found between the beginning of the scans where the extra noise peaks appeared and the electric activity. A peak frequency of 5 sec was observed but which may be related to the air conditioned system.