FIS Performance
---------------
17 October 2006
The following performance has been derived by the FIS team on the basis
of in-orbit measurements:
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Pointing in 5 sigma at one scan with 2 sec integration
with 15 arcsec/sec drift
In orbit Observers Manual
N60 78 mJy 70 mJy
Wide-S 16 mJy 15 mJy
Wide-L 85 mJy 12 mJy
N160 198 mJy 24 mJy
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These values are scaled to other integration times, assuming
S/N is proportional to 1/sqrt(integration time)
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Pointing in 5sigma at one scan with 1 sec integration
with 15 arcsec/sec drift
In orbit Observers Manual
N60 110 mJy 98 mJy
Wide-S 23 mJy 21 mJy
Wide-L 120 mJy 24 mJy
N160 280 mJy 49 mJy
----------------------------------------
Pointing in 5sigma at one scan with 0.5 sec integration
with 15 arcsec/sec drift
In orbit Observers Manual
N60 156 mJy 140 mJy
Wide-S 32 mJy 30 mJy
Wide-L 170 mJy 49 mJy
N160 396 mJy 98 mJy
----------------------------------------
Pointing in 5sigma at one scan with CDS
with 15 arcsec/sec drift
In orbit Observers Manual
N60 2400 mJy 2500 mJy
Wide-S 530 mJy 500 mJy
Wide-L 2000 mJy 700 mJy
N160 4500 mJy 1400 mJy
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Summary and Notes
1. The performance of the FIS detectors is influenced by cosmic ray hits.
The induced glitch in the detector signal (at a frequence of about
one per minute) contributes to the final noise figure.
2. The performance of the SW bands (Ge:Ga detector array ) is close to the
pre-launch predictions.
3. The performance of the LW bands (Str. Ge:Ga detector array) is
worse than pre-launch prediction. This is attributed to the reduction
of the bias voltage to get better performance of the detector and
the low-frequency noise larger than expected, which reduces the
improvement in longer reset interval observations.