Hello again,
the story with an apparently broken deuterium preamplifier within a cryoprobe
continues.
What we have is a cryoprobe, which needs very high lock power to get a
reasonable lock signal. With a high probability the T/R switch of the built
in deuterium preamplifier is broken.
We made some measurements.
* Output signal of the deuterium transmitter of the console: o.K.
* Same signal at the output of the HPPR deuterium preamplifier: o.K.
* DC offset to trigger the internal T/R switch at the output of the HPPR
deuterium preamplifier: o.K.
According to the technical manual the current of this DC bias signal should
be 25 mA. Internally this signal is Labelled as CRP_TXSW.
For the moment I am looking for ideas, how to measure this current. Presumably
this wouldn't help, but I would be Happy to know the reason of the lock failure,
before removing the probe and organizing the repair.
Greetings
Rainer
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Received on Thu Oct 03 2024 - 05:08:20 MST