Planck early results
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Table 4

Power levels and temperature ranges of the seven independent heater lines of the warm radiator temperature control system.

Power Sample T Range
Loop number [W] configuration [°C]

13 ............ 78 On  −8 to  −9
14 ............ 78 On  −9 to  −10
8   ............ 91 On-Off  −10 to  −11
12 ............ 91 Off  −11 to  −12
32 ............ 91 Off  −12 to  −13
28 ............ 91 Off  −13 to  −14
27 ............ 91 Off  −14 to  −15

Notes. Heaters are always on, always off, or controlled on-off (“bang-bang” control). The sample configuration was typical during the first months of operation.

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