NOAA KLM User's Guide

Section 9.7.1.5

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9.7.1.5 Housekeeping Data Ranges and Conversions

The SBUV/2 instrument provides a variety of housekeeping data to monitor the health of the instrument itself. These data are contained in the Digital A Subcom Analog Housekeeping and the Analog Telemetry. On the 1b Data Set these data are stored in the individual data records as raw counts. However, in the orbital and daily statistics records these data have been converted to engineering units. For discrete data, there are two sets (of 16 seconds each) of Digital A (Subcom) Analog Housekeeping data and two sets of Analog Housekeeping data for each major frame (one record). For sweep data, where one major frame requires 2 data records, both Digital A Subcom and Analog Telemetry data are present for each 16 second interval (i.e. each data record).

Tables 9.7.1.5-1 and 9.7.1.5-2 on the following pages contain the housekeeping data ranges, counts to engineering units conversion methods and, for orbital and daily statistics, the scaling factors of the stored data (e.g., a stored value of 4316 with a scaling factor of 102 is really 43.16). The source of this information is the TIROS-N Unique Instrument Interface for SBUV/2. Data ranges are not used in computing orbital and daily statistics (i.e. no data are excluded).

Three conversion methods are used to go from raw counts to Engineering Units (E.U.), depending on the type of housekeeping data:

1. Linear interpolation

"E.U."= (A x counts) + B
where A and B are given in Table9.7.1.5-1 or 9.7.1.5-2.

2. SPTEMP: Convert single point temperature to degrees Centigrade using cubic spline interpolation.

a. Convert count to voltage in volts.
b. Select appropriate temperature-voltage curve for interpolation
c. Select closest four points on given curve for interpolation
d. Perform cubic spline interpolation/extrapolation

3. DFTEMP: convert differential count to differential temperature.

a. Compute thermistor A count from differential count and reference count
b. Obtain thermistor A temperature in degrees Centigrade (use SPTEMP)
c. Compute differential temperature from thermistor A temperature and reference temperature.

Table 9.7.1.5-1. Digital A Subcom Housing Channels.
Range*
Channel Function Counts Engineering Units Conversion Method Statistical Record Scaling Factor
1A Chopper Motor Current 0-255 0-0.15A A = .002 N 104
1B Spare spare spare A = .002 N 1.0
2A Diffuser Motor Current 0-255 0-1.02 A A=.004 N 104
2B Diffuser Plate Temp. 0-255 0-80o C SPTEMP 102
3A HVPS volts 0-255 0-1530 V=6 N 101
3B Baseplate Temp. 0-255 -15 to 45o C SPTEMP 102
4A Thermistor Bias (+10V REF) 135-165 9-11 V V=.0667 N 103
4B +25V Power-Volts 113-139 22.5-27.5 V V=.198 N 102
5A Cal Lamp Temp. 0-255 0-80o C SPTEMP 102
5B +15V Servo-Volts 135-165 13.5-16.5 V V=.1 N 103
6A ECAL Ref. Voltage 145-175 5.8-7 V V=.04 N 103
6B -15V Servo-Volts 147-153 -16.5 to -13.5 V=.5076 N-91.4 103
7A +15V Sensors-Volts 135-165 13.5-16.5 V V=.1 N 103
7B CCR Diode Temp. 0-255 -5 to 35o C SPTEMP 102
8A -15V Sensors-Volts 147-153 -16.5 to -13.5 V=.5076 N-91.4 103
8B SM differential Temp. Y 0-255 -5 to 5o C DFTEMP 103
9A +24V Motor-Volts 95-147 19 to 29 V V=.198 N 103
9B SM Differential Temp. Z 0-255 -5 to 5o C DFTEMP 102
10A +5V LED-Volts 120-180 4-6 V V=.0333 N 103
10B Differential Ref. Temp Z 57-179 -15 to 45o C SPTEMP 102
11A +10V Logic-Volts 135-165 9-11 V V=. 0667 N 103
11B Differential Ref. Temp Y 57-179 -15 to 45o C SPTEMP 102
12A CAL Lamp Current 0-255 0-1331.1 µ A A=5.22X10-6 N 108
12B PMT Cathode Temp. 0-255 -5 to 35o C SPTEMP 102
13A Spare spare spare -- 1.0
13B Spare spare spare -- 1.0
14A Grating Coarse Error(1) 0-255 24 to -25 steps Step=-.1935 N+24 103
14BChopper Phase Error 0-255 0-25.12 V V=.0985 N 103
15A Grating Motor Current(1) 0-255 .73 to -.392 A A=-.0044 N+.73 104
15B Spare spare spare SPTEMP 1.0
16A Lamp Motor Current 0-255 0-1.02 A A=.004 N 104
16B Spare spare spare SPTEMP 1.0
Notes:
°C = degrees Centigrade, A = Amperes, V = Volts, μA = microamperes, N = Actual count
* Ranges are normal ranges for voltages. For other items, these are maximum ranges.
(1) Grating Coarse Error and Grating Motor Current are expected to read 0 to 10 counts for Flight Model #1. These telemetry points were grounded out before launch.

Table 9.7.1.5-2. Analog Telemetry Points.
Range*
Channel Function Counts Engineering Units Conversion Method Statistical Record Scaling Factor
1 SM Baseplate Temp. #2 (1) 0-255 -15 to 45o C SPTEMP 100
2 SM Shroud Temp. 0-255 -30 to 80o C SPTEMP 100
3 Depolarizer Housing Temp. 0-255 -15 to 45o C SPTEMP 100
4 HVPS Temp. 0-255 -15 to 45o C SPTEMP 100
5 Diffuser Plate Temp #2(1) 0-255 0 to 80o C SPTEMP 100
6 Chopper Motor Temp. 0-255 -15 to 45o C SPTEMP 100
7 Grating Motor Temp. 0-255 -15 to 45o C SPTEMP 100
8 Diffuser Motor Temp 0-255 -15 to 45o C SPTEMP 100
9 Cal Lamp Motor Temp. 0-255 -15 to 45o C SPTEMP 100
10 Electrometer Temp. 0-255 -15 to 45o C SPTEMP 100
11 Cal Lamp Power Supply Temp. 0-255 -15 to 45o C SPTEMP 100
12 Diffuser Radiator Temp. 0-255 -15 to 45o C SPTEMP 100
13 ELM Temp. 0-255 -15 to 45o C SPTEMP 100
14 LVPS Temp. 0-255 -15 to 45o C SPTEMP 100
15 Diffuser Heater Current 0-255 0-.459 A A=.0018 N 104
16 Baseplate Heater Current 0-255 0-.459 A A=.0018 N 104
17 28 V Main Power 120-160 24-32 V V=.2 N 100
Notes:
oC = degrees Centigrade, A = Amperes, V = Volts, N = Actual Count
* Ranges are normal ranges for voltages. For other items, these are maximum ranges.
(1) Powered from the 28 V Analog TM BUS


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