NOAA KLM User's GuideSection 9.7.1.5 |
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

2. SPTEMP: Convert single point temperature to degrees Centigrade using cubic spline interpolation.
3. DFTEMP: convert differential count to differential temperature.
| 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. |
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| 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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