8.2 MECS HK parameter list
We list here the names of all MECS HK parameters. The notation mi or i is used
to refer to the three MECS units (m1,m2,m3) and/or to parameters
relevant to a particular unit.
Parameters of some use for the general observers are some of the ratemeters, the POP status,
and perhaps the temperatures and the LED status (which shall be OFF). The remaining status
parameters are usually never commanded other than at the nominal level, while the voltages
should be very stable (therefore uninteresting).
Engineering ratemeters
These are count values, sampled
every 1 s, in Engineering packets MiENG000. These packets are present only
when scientific data production (POP) is enabled.
The parameter name is the same for the three MECS units, one accesses the parameters
of one specific unit by selecting the appropriate packet.
- trigger, counts triggering the detector
- valemin, events accepted above the low energy threshold
- rejemax, events rejected above the high energy threshold
- valblmin, events accepted above the low burst length threshold
- rejblmax, events rejected above the high burst length threshold
- rejmpbus, events rejected when microprocessor is busy (+ pile-up)
- reje, events rejected by s/w energy thresholds
- rejbl, events rejected by s/w burst length thresholds
- rejxy, events rejected by s/w spatial (X,Y) thresholds
Safety ratemeters
These are count values, sampled
every 1 s, present in instrument HK packets MEHKD000.
These packets should be present even when no Engineering packet is there.
- rmi (i=1,2,3), same as valemin, see above
(High) voltages
every 16 s, in instrument HK packets MEHKD000.
- hvpmti (i=1,2,3), HV of the PhotoMultiplier Tube
- hvdrifti (i=1,2,3), HV of the Drift region in the gas cell
- hvwini (i=1,2,3), HV applied to the Window of the gas cell
- eup5 and eum5, voltage of the +/- 5 V supply line
- eup12 and eum12, voltage of the +/- 12 V supply line
- dup28, voltage of the +28 V supply line
Instrument temperatures
every 32 s, in instrument HK packets MEHKD000.
- temppmti (i=1,2,3), temperature of the PhotoMultiplier Tube supply
- tempdrii (i=1,2,3), temperature of the Drift HV supply
- tempdc1 and tempdc2, temperatures of the prime and redundant
DC/DC converters
Miscellaneous status information
every 64 s, in instrument HK packets MEHKD000.
- popstat, POP status (ENABLE,SUSPEND,DISABLE)
- popid, POP identifier (not interesting)
- itmode, instrument FIFO mode (normal or diagnostic, not interesting)
- duall, ON/OFF flag of the "all detector unit" relay
- dumi (i=1,2,3), ON/OFF flag of individual unit relay (not used)
- led, ON/OFF flag for the Light Emitting Diode stimulation
- dbiif, Data Bus Interface flag (not interesting)
- pmtmi (i=1,2,3), ON/OFF flag of individual unit PMT (not used)
- windowmi (i=1,2,3), ON/OFF flag of individual unit window HV (not used)
- driftmi (i=1,2,3), ON/OFF flag of individual unit drift HV (not used)
- xelomi and xehimi (i=1,2,3), low and high energy threshold
- dbl1lomi, dbl1himi,dbl2lomi, dbl2himi
(i=1,2,3), low and high (1st and 2nd) burst length (digital) threshold
- dxlomi, dxhimi,dylomi, dyhimi
(i=1,2,3), low and high (X and Y (digital) threshold
- throff safety count threshold for automatic switch off
Spacecraft controlled temperatures
every 5 s, in Thermal Control Unit telemetry packets TCHKD000
- tmumi (i=1,2,3), for the Mirror Units associated to
each MECS unit
- tboxmi (i=1,2,3), for the Detector Unit box of
each MECS unit
sax.iasf-milano.inaf.it/Xashelp/hkaccum.2.html
:: original creation 2002 Sep 04 18:12:05 CEST ::
last edit 2002 Sep 04 18:12:05 CEST