Date: Sun, 23 Feb 2003 07:32:25 -0700
From: "Peregrine M. McGehee"
Subject: Re: 2.5m obslog 20030222 (MJD 52693)
Steph,
While this likely got buried under the SOP guider issues this
was also the first night many of the TPM alarms were exercised
with the telescope in use. I see persistent tracking errors
on all three axes - since this is taken from the MEI it is a
measure of mechanical/servo performance and not that of whether or
not the telescope is pointing correctly - thus likely not
related to the SOP problems.
The TPM alarms when the 5 sample (0.25 second) mean of the servo
error exceeds 7 and 10 encoder counts (0.1 and 0.14 arcsec) when
it believes the telescope is tracking (velocity < 45 arcsec/sec).
Examination of the Altitude errors shows momentary (< 1 second)
excursions of upto 0.6 arcsec. I will cut version tpm_v2_27_0
today with the interval over which the mean is computed extended
to 1 second.
- Peregrine
--
Peregrine M. McGehee
Department of Astronomy
New Mexico State University, Las Cruces, NM