Planck pre-launch status: Design and description of the Low Frequency Instrument

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Table 3:

Top-level systematic error budget (peak-to-peak values).
	Random^a	Spin synch	Periodic^a
Source	$\delta T$ fraction	[ $\mu$ K]	[ $\mu$ K]
External straylight .....................	$\ldots$	1	$\ldots$
Internal straylight ......................	0.045	1	0.9
4 K load ......................................	0.025	1	0.6 (11)
Thermal fluctuations ..................	0.03	0.8	1.1 (11)
Front end 1/f ...............................	0.25 (0.34)	$\ldots$	$\ldots$
Back end 1/f ................................	0.35 (0.48)	$\ldots$	$\ldots$
DC electronics ............................	0.04	$\ldots$	$\ldots$
Quantisation ...............................	0.01	$\ldots$	$\ldots$
...................................................
Total ...................................	0.44	1.9	1.5
Noise increase ............................	1.091

Notes. ^(a) For 1/f and thermal periodic fluctuations the allocated limits are residuals after consolidated software removal techniques are applied to the data (numbers in parenthesis give the effect before removal).

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