August 30, 2016

Instrument performance monitoring

SAPHIR

Performances: Noise, gain, and sensitivity performance monitoring

TEC (Technical Expertise Centre) monitors for 150 SAPHIR parameters, about 100 alarms and about 20 types of monthly trend curves.

Gain	C1	C2	C3	C4	C5	C6
Ground validation	20.46	21.45	22.3	22.02	21.53	21.96
In-Flight commissioning	21.29	22.85	24.15	24.17	23.32	24.46

All parametres are very constant; there is only a variation at the beginning of life due to normal warm-up and vacuum stabilization.

Technological
- HKTM: BNR tension, heating power, EM and RFU temperature, probe temperatures [EM, plate, scan], primary currents
- IA and IB currents
- gains, gain changes
- Optical coder and parity problems
- reboot instrument
- CRC errors, on board counter, cycle number, time increments, TM holes, corrupted TM packets
- mode switches, direction flip
- pixel saturation
- Scan system technical characteristics, related to the cold source/Earth pointing
- DC, hot and cold source, IFP, LO, OBCT, Scan temperatures monitoring

Quality
- On L1: % of invalid, min, max TB

SCARAB

Performances: Noise, gain, sensitivity, darkness level, TBBREF (reference cold body), TCALM performance monitoring

For all SCARAB graphs, the first point on the left is the beginning of life and the last point on the right is the last calibration measurement in August 2016.

Technological
- HKTM: BNR tension, probe temperatures [EM, OSM], primary currents
- IA and IB currents
- Scan, 2-3-4 Black body, reference Black body (BBREF), CALM, lamp, LW-SW Modulator temperature monitoring
- mode switches, direction flip
- pixel saturation
- Scan system technical characteristics, related to the cold source/Earth pointing
- Lamp monitoring
- CRC errors, on board counter, cycle number, time increments, TM holes, corrupted TM packets
- Modulator monitoring (SW, LW, COS, SIN, VA, VB tensions)
- Filter wheel monitoring

Quality
- On L1: % of invalid, min, max radiances

MADRAS (over the functioning period)

Performances: Noise, gain, sensitivity performance monitoring

NEDT	M1 H/V	M2 V	M3 H/V	M4 H/V	M5 H/V
Specification °K	0.7/0.7	0.7	0.7/0.7	1.1/1.1	2.6/2.6
Objective °K	0.5/0.5	0.5/0.5	0.5/0.5	1/1	2/2
In-Flight commissioning and stable until the instrument switch-off	0.33/0.38	0.34	0.28/0.28	0.38/0.36	1.01/0.94

Technological
HKTM: BNR Tension
ON/OFF gains Cycles, gain changes , gain corrections
Cold Calibration, hot calibration
viewing direction (forward/backward) and flips, mode switches
On board counter (scan counter, scan period)
Temperatures (anomalies, mean temperatures, cold or hot sources, DC, IFEE, LO78, LO89 temperatures, etc.)