Date: Fri, 25 Jul 2025 14:28:58 +0000 (UTC)
Hi Birgit,
This "load resistance too high" is kind of a smoking gun--it does appear that
the heater in your probe has likely failed. Here's a pinout of the connector--
I'm not sure if this is of the cable side or the probe side, but the pins for the
heater are symmetric so you should be able to get a reasonable measurement of
the resistance. If it is indeed ~722 Ohms then that is too high and the
heater needs replacement. If you instead measure a reasonable resistance
at the probe (I forget what it's supposed to be, but I think it's in the tens
of ohms range) then it's more likely that the TC-2T has failed and needs
replacement.
Cheers,Mike
On Friday, July 25, 2025 at 07:37:52 AM MDT, Dr. Birgit Claasen wrote:
Dear all,
we have currently a problem with the VT unit of our Bruker 400 Avance II
HD Nanobay NMR spectrometer. Enclosed you can find a brief summary with
some figures documenting the problem.
The heater cannot be switched on in the EDTE window (error message:
‘Parameter VTC_CMD_STAT parameter not writable’). Channel 1 reports:
‘Regulator inoperative’. The probe gas is also off and cannot be
switched on. There appears to be no connection to the probe.
The log file history of the EDTE window shows that there was recently an
overheating in the safety sensor: ‘1561.4 K is above limit of 673.0K on
Ch1.’
We then performed a VT selftest using the BSMS Service Tool. It says
‘Active Ch1 heater TC_2T inoperative. Load resistance too high: 722.32
ohms.’
We suspect that the heater in the probe or the TC_T2 controller is
defective. To test this, we would like to measure the heating plug. What
values can be expected here? We have a 7-pin plug .
What else could we try? Does anyone have any ideas?
Best wishes
Birgit Claasen
--
Dr. Birgit Claasen
Analytikabteilung - Technische Leitung
Institut für Organische Chemie
Universität Stuttgart
Pfaffenwaldring 55
70569 Stuttgart
Tel: +49 711 68564379
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