Re: I camera fixed?

[hjohnson@pluto.njcc.com (Herbert R Johnson)]

On Mon, 07 Feb 2000 14:16:59 -0600, Tom Droege <droege@wwa.com> wrote:
*>It appears that I have found the problem with the I camera.  I am now
*>getting nice flat (dark) images on both cameras.  To explain the "fix" one
*>has to go back to last September/October when I was trying to get ARNE
*>ready to ship out to AZ.  
*>
*>Warning!  The following will be as boring as Andrew's spline fits (to me)
*>to someone not interested in electronics.  

I'm sure like most of our TASS members I'm in this to be informed, not
to be entertained, and I've found the boring details to be essential in
making things work.

*>Now the [amplifier] turn on transient that I have been observing has a time
*>constant of
*>order 25 seconds.  This is a factor of 100 away from what I thought was in
*>the interstage coupling.

Yeow! That says it all to me. For fun, I should look at the pixel
dark current value vs "time" (across the rows) to see if the value declines
systematically.

*>I have solved three major problems since last October.  Any one of the
*>three would have kept me from shipping out the camera.  One is this turn on
*>transient.  Another is the RA drive.  The third is that I discovered how I
*>have been breaking the TECs.  There are still some problems left.  But I
*>seem to be back in success mode instead of break everything mode.

In my working life (including repair of electronics) I've also found I have
good days when I have the "golden touch" and bad days when I have the
"feces touch"; so I'm sympathetic. Glad you are on a roll, Tom.

Herb Johnson

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