Specifications

Doc Number: VIS-ANA-VER-01001-9002
Date: 27 May 2004
Issue: 5.0
Page: 18 of 80
Author: J. Delgadillo
Controls Preliminary Design Report Issue 5.doc
AD01 Spec VISTA SPECIFICATION MCS CAPABILITY
8.4.2
Quasi Static Pointing Error
Non-Repeatable
Full Sky < 1.0 arcsec rms
0.17 deg < 0.1 arcsec rms
2 deg < 0.25 arcsec rms
60 deg < 0.5 arcsec rms
Total
Full Sky < 15 arcsec rms
0.17 deg < 0.1 arcsec rms
2 deg < 0.5 arcsec rms
60 deg < 8 arcsec rms
(Refer to AD04)
Non-Repeatable
0.460 arcsec rms
0.087 arcsec rms
0.154 arcsec rms
0.460 arcsec rms
Total
28.0arcsec rms
0.117 arcsec rms
1.02 arcsec rms
23.2 arcsec rms
10.5.2
Cass Tracking Requirements
Non-Repeatable
Full Sky 9.3 arcsec rms
60 deg 1.2 arcsec rms
Total
Full Sky 31 arcsec rms
(Refer to AD04)
Non-Repeatable
0.68 arcsec rms
0.68 arcsec rms
Total
10.02 arcsec rms
11.1.4.1
100 % CASS Motor Overhead
(Refer to AD03)
224 %
11.1.6
Encoder Resolution
Azimuth < 0.01 arcsec
Altitude < 0.01 arcsec
Cass < 0.015 arcsec
(Refer to Calculation’s
Section 4.5)
Azimuth 0.003 arcsec
Altitude 0.002 arcsec
Cassegrain 0.003 arcsec
11.1.8.1
Axis Limits
Vicinity
AZ Not Specified
ALT Not Specified
CASS Not Specified
Pre-Interlock
AZ +140°, -320°
ALT -1°, 91°
CASS +188°, -368°
Interlock
AZ +144°, -324°
ALT -2°, 92°
CASS +192°, -372°
End Stop
AZ +148°, -328°
ALT -4°, 94°
CASS +196°, -376°
Vicinity
AZ +140°, -320°
ALT -1°, +91°
CASS +188°, -368°
Pre-Interlock
AZ +141°, -321°
ALT -2°, 92°
CASS +189°, -369°
Interlock
AZ +142°, -322°
ALT -3°, 93°
CASS +190°, -370°
End Stop
AZ N/A
ALT -5.8°, 96.8°
CASS N/A