8. Accumulating HK time profiles

An HouseKeeping (HK) time profile is like a normal light curve, only the quantity present as a function of time are not counts taken from a science data file, but is the value of an HK parameter (voltage, temperature, setting ...).

These accumulations are similar to normal accumulations, one main difference being that one shall select a mnemonic code for the wished HK parameter, and this often automatically selects the telemetry packet to use.
As for normal accumulations as prerequisites one shall ensure that

FOT tape data have been filed to disk
setting of the appropriate environment variables is complete
a valid observation chain has been defined.

the default accumulation is invoked with command

accumulate hk [ tfile hkname {packet} trange tbin

there is no HK context to be selected
There is no way nor sense in using a quantity different from TIME or to use the pseudo accumulation mode for HK time profiles, the environment variables xquantity, yquantity or accummode have no effect.
However the following environment variable can be used to control the default behaviour. By default the digital values of the HK parameter in telemetry are converted to engineering (or physical :-) ) units as appropriate. This behaviour can be reversed if raw digital data are wished. Toggle is possible using commands :
```
xasset hkconvert Disabled
xasset hkconvert Enabled
```
A list of the various instrument HK parameters is provided elsewhere.

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sax.iasf-milano.inaf.it/Xashelp/hkaccum.html :: original creation 2002 Sep 04 17:43:38 CEST :: last edit 2002 Sep 04 17:43:38 CEST