GRAVITY: FT piezo response
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HC PLOTS |
Piezo1 |
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Piezo2 |
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Piezo3 |
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Piezo4 |
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QC1 database (advanced users):
browse |
plot
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The response of the four FT piezos is measured once a week during daytime.
There are five response measurements for each piezo and for each of the
four FT DITs in use: 0.84, 0.85, 3, and 10 ms.
Response
QC1_parameters
FITS key |
QC1 database: table, name |
definition |
class* |
HC_plot** |
more docu |
NONE | gravity_piezo..piezo1_response1_diff | difference between measured and stored response of piezo 1 and delay 1 [rad/Volts] | CAL | | [docuSys coming] |
*Class: KPI - instrument performance; HC - instrument health; CAL - calibration quality; ENG - engineering parameter
**There might be more than one. |
Same for response 2, 3, 4, and 5, and for piezos 2, 3, and 4.
Trending
The differences between the measured and the stored values for the piezo
response are trended.
Scoring&thresholds Response
The differences should be within -1 and +1 rad/Volt. If they are repeatedly
outside then the stored values should be updated. Since there is no need for
immediate action when thresholds are violated, scoring has not been implemented.
History
Introduced in September 2019.
Algorithm Response
The measured values can be found in the product header keys QC.FT.KAL.P<n>_RESP<m>, the stored
values in ESO.FT.KAL.P<n>_RESP<m>, with <n>=1, 2, 3, 4 and <m>=1, 2, 3, 4, 5.
The trended QC parameters are the differences measured - stored.
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