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Tue, 13 Sep 2005 17:21:47 +0100

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Stable Isotope Geochemistry <[log in to unmask]>

Subject:

VG Sector 54 Voltage supply

From:

Thomas Gebbing <[log in to unmask]>

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Stable Isotope Geochemistry <[log in to unmask]>

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Hi there.
The focus unit (MS766) of our VG Sector 54 fails to provide a stable voltage. When the unit is cold the voltage is stable at 8kV for about 5 minutes. Then it drops down continously. 
According to our electrician I replaced the triode valve (PD500, not easy to get), but the problem persists. Even when the unit is pulled out of the cabinet and not connected to the instrument. After being switched off for about an hour, the above pattern can be reproduced. Looks like a temperature problem of a component.
Any ideas?
Thank you.
Thomas


--
Dr. Thomas Gebbing
Macaulay Institute
Craigiebuckler
Aberdeen AB15 8QH, UK
phone: +44 (0)1224 498200 extension 2712
direct: +44 (0)1224 498245 - 2712
[log in to unmask]
http://www.uni-bonn.de/~ulp203

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