Unihedron SQM-LU, Руководство оператора

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8.3 Calibration commands
8.3 Calibration commands
8.3.1 Calibration information request
The calibration information request “
cx
” returns all data about the specific light sensor in the unit required to calculate
a reading.
The format of the response is shown in table 8.5:
Table 8.5: Calibration information request response
Column Example value Description
0
c
Indicates that the calibration information is being returned.
2-13
00000017.60m
Light calibration offset in
mag
arcsec 2
.
15-26
0000000.000s
Dark calibration time period in seconds with millisecond resolution.
28-34
039.4C
Temperature in degrees C measured during light calibration.
Leading space for positive value.
Leading negative sign (-) for negative value.
36-47
00000008.71m
Offset of light sensor in
mag
arcsec
2
based on manufacturing reference.
49-55
039.4C
Temperature in degrees C measured during dark calibration.
Leading space for positive value.
Leading negative sign (-) for negative value.
56-57 Carriage return (0x0d), Line feed (0x0a).
An example of the response is:
c,00000017.60m,0000000.000s, 039.4C,00000008.71m, 039.4C
0123456789 123456789 123456789 123456789 123456789 1234567
8.3.2 Light calibration command
Calibration of the SQM-LU is done at the factory in a controlled light and temperature environment.
Executing the Light calibration command “
zcalAx
” arms the light calibration mode.
A calibrated light source of approximately 13.5fc is supplied to the sensor.
The format of the response is shown in table 8.6:
Table 8.6: Light calibration response
Column Example value Description
0
z
Indicates that a “Calibration” response is being returned.
1
A
Indicates Light Calibration mode.
2
a
Indicates that the calibration is armed.
3
L
L = Locked; Wait for unlock before calibrating after Arm command,
firmware upgrades are disabled.
U = Unlocked; Calibrate immediately after Arm command, Enable
firmware upgrade.
4-5 Carriage return (0x0d), Line feed (0x0a).
An example of the response is:
zAaL
012345
Unihedron SQM-LU Operator’s Manual -
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