Difference between revisions of "Monitoring System Requirements"
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+ | # Details: [http://www.jlab.org/Hall-D/software/wiki/index.php/Dec_06%2C_2010_Calibration/Monitoring Minutes/notes from December 6, 2010] | ||
# Comment: Time (and temperature) stability most important. | # Comment: Time (and temperature) stability most important. | ||
− | # Comment: Option of delivering a range of light intensities important (e.g. using various filter settings). | + | # Comment: Option of delivering a range of light intensities important (e.g. using various filter settings). Athens: test stability of LEDs at low output (near threshold) to see if this can be used as an additional check point in our monitoring. |
− | # Comment | + | # Comment: The flexibility in the use of the LED would be very useful for the start counter. |
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− | + |
Revision as of 18:07, 8 December 2010
Characteristic | LED/fibre | LED/wire |
---|---|---|
Dead/alive or on/off | yes | yes |
Timing check/offset | yes | yes |
Relative gain check | yes | yes |
Linearity check | low end (a few times one LED) only | low end (a few times one LED) only |
Temperature stability | yes, sensors in box | sensors in areal spread? |
Tower row flashing | yes, multiplexer | yes, multiplexer |
Simultaneously flash both ends | no solution yet | no solution yet |
Location of LEDs input | Boxes at outer edge of each module, fibres | LED+board on light guide, LPCM in rack |
Geometrical constraints | mechanical/fragility/replacement are serious concerns | none; easy to install |
R&D done | Some, solution not preferred | Extensive, mature solution exists |
Cost | Not costed | quotation exists (getting stale) |
- Details: Minutes/notes from December 6, 2010
- Comment: Time (and temperature) stability most important.
- Comment: Option of delivering a range of light intensities important (e.g. using various filter settings). Athens: test stability of LEDs at low output (near threshold) to see if this can be used as an additional check point in our monitoring.
- Comment: The flexibility in the use of the LED would be very useful for the start counter.