HouseKeeping and Rate Counters

Introduction

SubSystem HSK Parameters
ACD/XGT
CAL
TKR

How to associate a HSK record with event data

Introduction

For the 2001 GLAST BFEM - we will attempt to store housekeeping (HSK) and rate counter data in Root files. It is our understanding that there are both general housekeeping parameters and subsystem specific parameters. The rate counter packets will also appear in the HSK data stream.

The packet name that contains HSK data is "ivth".

The packet name that contains the rate counters is "ivtr".

HouseKeeping Data

Organization of ivth packets in the actual data stream

ivth packets will be written approximately every second. However, the acdh (ACD HSK data) will only be available ever 10 seconds. So, in the data stream, one would expect to find 10 ivth packets composed of: vsmh, tkrh, gpsh, and daqh subpackets, then one ivth packet consisting of one acdh subpacket.

General parmeters (ivth/vsmh)

Here is a list of general HSK parameters obtained from Dave Thompson, dated July 9, 2001. These parameters will probably change! And... we do not have the proper definitions only the names... where:
v == voltage
i == current
t == temperature

Name	Calibration	Definition
tkr2v	1.83 V
tkr2i	1.44 A
tkr3v	2.70 V	< 2.8
tkr3i	2.11 A
tkr5v	3.74V	< 4.8
tkr5i	0.34 A
tkrHvV	129.76V
tkrHvI	456.60 uA	< 480.0
tkrHvT	29.93 C
cal5v	5.18 V
cal5i	0.62 A
calVicT	29.82 C
calTopT	10.03 C
acdDig5v	4.97 V	5 volt supply voltage to digital electronics
acdDig5i	1.01 A	5 volt supply current to digital electronics
acdAna5v	4.92 V	5 volt supply voltage to analog electronics
acdAna5i	1.30 A	5 volt supply current to analog electronics
acd28v	31.91 V	28 volt supply voltage (to feed high voltage supply)
acd28i	334.06 mA	28 volt supply current (to feed high voltage supply)
acdVicT	39.45 T	temperature of the Vicor power supply regulator
acdHvT	37.52 T	temperature of the BERTAN high voltage supply
xgt12v	0.54 V	12 volt supply voltage to XGTs high voltage supply <11.0
xgt12i	9.23 A	12 volt supply current to XGTs high voltage supply <10.0
xgtHVicT	29.93 C	disconnected, not used
xgtHv0	497.89 V	High voltage for XGT channel 0 pmt
xgtHv1	469.10 V	High voltage for XGT channel 1 pmt
xgtHv2	485.66 V	High voltage for XGT channel 2 pmt
xgtHv3	495.79 V	High voltage for XGT channel 3 pmt
magRoll	-5.20 g
magPitch	-5.15 g
ExtPr	-0.01 Psi	<0.0
IntPr	14.29 Psi

SubSystem specific paramters

CAL

There is no ivth/calh subpacket defined at this time. The CAL does store rate counters for the logs in the ivtr packets.

TKR (ivth/tkrh)

Consists of 5 of 16 internal temperature measurements. It is unknown precisely where the 5 working thermistors are located on the instrument.

ACD/XGT (ivth/acdh)

The description of the ACD data packets is nicely described in this document by Bob Schaffer. This document describes both HSK parmeters and rate counters. The acdh packets will be available approximately every 10 seconds.

GPS Time (ivth/gpsh)

The ivth packets contain the GPS time stamp in order to associate the proper ivte packets with the appropriate ivth packet. Here is a description of the gsp subpacket - under construction..

Rate Counters

The rate counter packets, ivtr, will appear in the HSK data stream.

ACD ivtr/acdr

The description of the ACD data packets is nicely described in this document by Bob Schaffer. This document describes both HSK parmeters and rate counters.

TKR ivtr/tkrr

Not yet implemented..it will be

CAL ivtr/calr

The CAL rate counters are described in the CAL Interface Control Document (ICD).

ivtr/gpsr

How to associate a HSK record with event data

We will be using the GPS time stamp in the ivth to associate HSK records with the event data records using the live time counters in the ltce. More soon...