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Mon, 5 Jan 1970 08:38:57 -0800 |
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We encountered a similar problem and also used a fan to circumvent it for
awhile. In our case, the problem occurs only when trying to send the
magnet to a high mass (20+ AMU); in this case it endlessly cycles between
min and max rather than going min-max-setpoint. This problem does not
occur when we analyze hydrogen. We were told to purchase a new board,
although not based on any detailed insight about the cause of the problem.
In discussing the issue with our electronics person, we speculated that
what is needed is to adjust the threshold on one of the DAC board
components. I would need to do some homework to reproduce exactly which
one we suspected. In any event, I would be interested to learn of anyone
who actually fixed the root cause of the problem.
John
>I have a Delts plus Xl system or as a grad student calls it. "That damn
>thing". Magnet control has been an ongoing issue with this instrument.
>In the past a fan has been placed to blow air across the DAC board to
>mantain function. Apparently there is a issue with the card overheating
>. However this solution is no longer working.
>
>I can regain control for a brief period of time after a hard reboot of
>the instrument. I can watch the magnet go to its max and min and measure
>the voltage on the DAC card cycling through. I can open the bellows to
>the source and get a good signal. But it quickly loses the signal and
>the ability to control the magnet.
>
>This is the 3rd DAC card and 2nd magnet regulator in this instrument but
>the boards to not seem to be the problem what is actual cause of the
>problem is a mystery to me. I hope someone can point my in the right
>direction.
>
>John Hart
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