Fundamental Technologies

Voyager LECP Pages

Appendix B (continued)

Table B-4, PHA Data Point
Description of LECP Data Quality Word Contents

BITS* VARIABLE DESCRIPTION
0-7 NBI Number of Basic Intervals-contains the number of basic accumulation intervals over which the corresponding rate is accumulated. The accumulation time in milliseconds is given by NBI*BAI. (See Tape Header Variables, formerly Table B2.)
8-10 MPB Motor Position-contains the motor position at the end of the accumulation interval. MPB ranges from 0 to 7, corresponding to the LECP sectors 1 thru 8 respectively. If MP or NMS (see Tape Header Variables, formerly Table B2) are less than zero then MPB is invalid.
11 MCF Motor Centered Flag-is set if the status word indicates that the motor was centered within the sector. It is zero otherwise.
12 MMF Motor Movement Flag-is set if a motor step occurred during the accumulation interval. It is zero otherwise.
13 DL Discriminator Level-is set if the LECP Beta detector is set to its high threshold state. It is reset otherwise.
14-15 SS Switch State-defines which of the b or b' and d or d' rates are accumulated.

00=not known; 01=b' - d detectors on; 10=b - d ' detectors on; 11=mixed
Bit 0 is the Least Significant Bit. If all bits=0 then datum is missing.

Table B-5, PHA Data Point

BYTE CONTENTS
1 ID Identification plus some special codes
376 octal if data was not present
377 if input ID byte was =0 and next byte was not
2 D1/D5
3 D2
4 D3
5 D4

Table B-6, Engineering Record on MRT File

See LECP_Engineering.pdf, Spaceflight Telemetry Dictionary LECP Channels.pdf
and LECP PreflightOperating Manual.pdf
INTEGER BYTE VARIABLE DESCRIPTION
1-5 1-10   Same as MRT Record Header Table B-2
6 11 ENFLGS Flags in which bits numbered 7-0 contain
7-6 Engineering rate 00=10 bps, 01=40 bps,
10 = 1200 not handled,
11 = 7200 stored 1200 not handled
6 12 ENEMF Engineering minor frame (0-59) of MUX(1)
If read from 100 deck, =0 from 200 deck
If <0 occurred in earlier record not available.
To reconstruct time if rate is 10 bps on 100 deck
M216 from record header, M60=iemf (which may be negative) LC =1
7-15 13-30   Same as MRT Record Header Table B-2
16-17 31-34 ENLEMT LEMPA Telescope temperature REAL*4
18-19 35-38 ENLOGT Logarithmic amplifier temperature REAL*4
20 39-40 ENRAB Redundancy A or B
21 41-42 ENTDN Temperature DN (DN is raw value)
22 43-44 MRRT Record type 10=ENG, 11=CAL


23-46
23-82

45-92
45-164		 ENMUX Array of readings each 1 byte
24 multiplexed readings for ENG data
60 multiplexed calibration readings for CAL

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Last modified 5/4/05, Tizby Hunt-Ward
tizby@ftecs.com
Original page by I. Robertson