I have a problem which pops up randomly where the Model 370 AC Resistance Bridge (with Model 3716/L 16-Channel Scanners) that is used to read the temperature sensors of a dilution fridge stops reading one or more channels. The real issue is that it is not possible to reactivate the channel without switching the resistance bridge off and on again (and even that is not a guarantee), which means that the fridge has to be warmed up.
Has anyone got experience of similarly buggy behaviour with reading of channels? Is there some way to force a channel re-initialisation? Could there be a firmware issue?
I realise that the fridge software is a potential culprit also, but it is not giving an "off" command per se. I am continuing to investigate that avenue, but some Lakeshore help in the meantime would be warmly received!
Usually it is one channel being consistently inaccessible. However, I've attached a picture of the worst case so far where initially one channel was affected and then all the channels were switching on and off wildly.
Post by Lake Shore Jeff M on Dec 14, 2020 10:54:10 GMT -5
Please let me know the following:
What software are you using to control the Model 370 How often does this occur Are you connecting the PC via a GPIB Interface or RS232 serial port If via GPIB, is it a National Instruments GPIB Adapter
Post by Lake Shore Jeff M on Dec 21, 2020 9:00:39 GMT -5
We would like to know the Model 370 serial number and its firmware version. You can obtain the version by pressing and holding the Escape Key in for about 5 seconds and the Display will show the Main Code information. Press Escape again to return to the normal display.
It might also be a good ides to reset the Model 370 to factory default values, however, before doing so, you should contact Oxford to see what specific configuration may need to be reentered if their software does not restore everything after a reset. The reset is done using the same procedure as described above followed by changing Default values from No to Yes and pressing enter. This will clear any corruption that is in the NOVRAM which could result in the issue you are seeing.
If you do not wish to publish the serial number here, please send an email to email@example.com and we can resume the troubleshooting there.
After struggling to find the serial number I found a sticker with a barcode and label 370AA5 underneath. The firmware is 04/10/2008 v2 which according the manual is the minimum required to successfully run the scanner.
I have been trying to troubleshoot from the software end with Oxford, and also written to support@lakeshore hoping it would find its way to you. I hope to hear back before I reset, but maybe that won't be possible.
Post by Lake Shore Jeff M on Feb 12, 2021 10:31:22 GMT -5
Based on the serial number of your Model 370, I suggest you check the DS1247Y NOVRAM device located in U107 to see what the speed of the device is. We have found that devices with a 100 write speed sometimes cause corruption whch will affect the operation of the model 370. If you have a DS1247Y-100 device, I recommend you order a DS1247-85 or DS1247-70 device and replace the -100 device to see if that resolves the issue The instructions to perform the replacement are in the attached document