Subject: Guider shutter is dead

From: jb@galileo.apo.nmsu.edu

Submitted: Fri, 13 Oct 1995 17:45:46 +0700

Message number: 1 (previous: 0, next: 2 up: Index)

The guider camera internal shutter is dead.  The problem is internal to
the guide camera housing and appears to be mechanical rather than
electical.  The details follow.

I disconnected the 9-pin connector from the guider and made some
measurements.  The power supply voltages were all above the specified
voltages, as one would expect from a no-load situation.  The shutter
voltage was 29 volts on, 0 off.  Short circuit current at the camera
connector was 11 amps.  The resistance between pins 2 and 7 (across the
solenoid coil) on the camera connector was 11.7 ohms, so it's not a
shorted or open coil.  These measurements eliminate any cabling problem
that I can think of (shorts, opens, poor connections, etc) outside the
camera.
 
Jon
 --
Dr. Jon Brinkmann                               Apache Point Observatory
Internet:       brinkmann@galileo.apo.nmsu.EDU  P.O. Box 59
URL:    http://galileo.apo.nmsu.edu/~jb/        Sunspot, NM 88349-0059
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