[time-nuts] HP 5061A problem
vilgotch at bigpond.net.au
Mon Aug 18 07:16:29 EDT 2008
My 5061A has failed and I've isolated the problem to a faulty A18, the +3500
volt ion pump power supply.
The existing one has almost certainly has had the internal 200M resistor go
open as the output voltage is about 5 kV and it does not decay quickly when
the power is off. The output voltage to the current sensing circuit is 0.
I have a replacement which I suspect is faulty - when energised from a +18
volt source it only produces 2 kV which decays quickly and the sensor output
is +20 when the thing is unloaded. That 200M resistor may have gone low! Is
this one worth installing ie: will +2 kV pump enough ions?
So I'm looking for a replacement or advice from anyone who may have
attempted to repair one.
If anyone has a parts donor of course I'd be happy to pay appropriately
including shipping down here to Australia.
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