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Date: Sat, 22 Jul 95 06:43:01 -0400
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From: baguhl@kosmo.DNET.NASA.GOV (ULYSSES/GALILEO-DUST Team, MPI-K Hd)
To: "sykes@as.arizona.edu"@EAST.DNET.NASA.GOV
Cc: BAGUHL@east.gsfc.nasa.gov
Subject: RE: DDS velocities
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Dear Mark,
thanks for your very thorough checking of the data. We had to
dig a little bit in the calibration routine to get the reason,
that is, mainly Rainer did, so I'm just appending his text.
The reason for the exclusion of the values 49,18,31 and 15 is
empirical. These values are close to the switching points of
the amplifier ranges and therefor produce incorrect time measurements.
The adjustment of the times in amplifier range 2 was made in order
to prevent illegal time values.
I hope this helps to clarify the measurements.
Regards
Michael
Rainers text:
-------------
Galileo:
if IA=49 or IA =18 or IA<3 then IT is not valid, (take v_et)
if EA=49 or EA =31 or EA<5 then ET is not valid, (take v_et)
if both of them are not valid, v=11.8 and vef=11.8
This explains the particles G39,G48,G118 (IA=49);G226 (IA=18) and
G21,G60,G179,G324 (EA=31).
Ulysses:
if IA=49 or IA>=60 or IA<3 then IT is not valid, (take v_et)
if EA=15 or EA>=60 or EA<5 then ET is not valid, (take v_et)
if both of them are not valid, v=11.8 and vef=11.8
This explains U120 (IA=49) and U769 (EA=15).
There is another condition for Galileo and Ulysses and this explains all the
other cases:
if IA>16 and IT>12 then set IT=14