Unihedron SQM-LU-DL-V, Руководство оператора

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8.2 Response details
Table 8.6 – continued from previous page
Column Example value Description
2-11
0001287103
Frequency reading.
A reading of
0000045000
would indicate a sensor frequency of 1Hz,
but the meter limits to 25kHz for later scaling of snow factor, so the
maximum value would be
1125045000
(25 kHz × 45000).
A reading of
0000000000
would indicate total darkness, but the meter
limits time readings to 85 seconds maximum, so the darkest value
would be
0000000529
(
1
85 s
× 45000).
55-56 Carriage return (0x0d), Line feed (0x0a).
An example of the response is:
f,0001287103
0123456789 123
8.2.4 Inline linear reading request
The “inline linear reading” request “
rFx
” (note: capital F) commands the meter to include the the current brightness
value proportional to the light flux or frequency output from the light sensor. This value is compensated for only by the
dark current frequency.
f
out
= f
light
−
f
dark
To allow for long period measurements, the output integer value is scaled up by a factor of 45,000.
n
out
= f
out
×
45000
The format of the response is similar to the “rx” response and is shown in table 8.7:
Table 8.7: Inline linear reading request response
Column Example value Description
0
r
Indicates that a reading is being returned.
2-8
06.70m
Reading in
mag
arcsec
2
.
Leading space for positive value.
Leading negative sign (-) for negative value.
A reading of
0.00m
means that the light at the sensor has reached
the upper brightness limit of the unit.
10-21
0000022921Hz
Frequency of sensor in Hz.
23-33
0000000020c
Period of sensor in counts. Counts occur at a rate of 460.8 kHz
(14.7456MHz/32).
35-46
0000000.000s
Period of sensor in seconds with millisecond resolution. Determined
by dividing the above counts value by 460800.
48-54
039.4C
Temperature measured at light sensor in degrees C.
Leading space for positive value.
Leading negative sign (-) for negative value.
Table continued on next page ...
Unihedron SQM-LU-DL-V Operator’s Manual -
20211013
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