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3.20 SPD level uncertainties

A summary is provided in Table 4.

**Table 4:** Summary of uncertainties at SPD level
			residual	residual
		statistical	Systematic	photometric
Correction	sect.	uncertainty	error	bias
Discarding read-outs	3.1	$\sqrt{(N_{ndr}+1)/(N_{ndr}-N_{dis})}$	none	none
Saturated read-outs	3.2	$\sqrt{(N_{ndr}+1)/(N_{ndr}-N_{sat})}$	none	none
Ramp linearization	3.3	$<2\,\%$	20%	none
Ramp deglitching	3.4	none	none	none
Signal extraction	3.5	${\Delta}s$	none	none
Signal deglitching	3.8	$<1\,\%$	none	none
Reset interval	3.6	none	5%	none
Dark signal	3.7	none	cf. table 1	none
Discarding signals chopped meas.	3.9	$\sqrt{2}$	?	none
Transient	3.10	$\sqrt {N_{s}/(N_{s}-N_{trans})}$	5%	none
Averaging signals	3.11	${\Delta}s_{ave}$	none	none
Chopper vignetting	3.12	none	2% for P,	none
			3% for $\rm C^a$	none
FCS power	3.13	none	<5%	15%
Responsivity PHT-P	3.14	none	<5% ( ${\Delta}A,$ )	none
Responsivity PHT-C	3.15	none	<5% ( ${\Delta}a_{fcs}$ )	none
Default responsivity	3.16	none	20%	10%
FCS Aperture correction (PHT-P)	3.17	none	${\Delta}A>100\%^b$	none
Illumination matrix (PHT-C)	3.18	none	${\Delta}{\Gamma}<5\%^b$	none
Detector flat-field (PHT-C)	3.19	none	${\Delta}{\chi}<5\%^b$	none


Notes		 
a:  on total (source plus background) flux 
b:  for the biggest apertures (99'', 120'', and 180'')

Next: 4. Instrumental effects not Up: 3. Derive SPD level Previous: 3.19 Detector pixel filter-to-filter

ISOPHOT Error Budgets: Derive_SPD Processing Steps, Version 1.0, SAI/98-091/Dc