Dear Spinlanders,
I have a Highland L200 Triax gradient amp in a 1997 Inova 500 that has developed a problem and I was hoping someone out there may have a Trax gradient amp and may know if there is a fix. The amp has shutdown with an error on the Z-gradient, namely Z Brk Low with a value of ~17 (deg C). The nominal value is supposed to be 65 and the X and Y Brick values are 59.1 and 59.7. The lab temperature is 21 C so a reading of 17 was a bit odd. The manual is quite terse and only says that this error is due to insufficient warm-up time before reset. Resetting does not bring it back online. If the amp is powered down and then powered back up it takes longer than 3 minutes to go into standby from the warm-up condition which causes the error. No amount of warm-up time allows the amp to be reset. Once the error condition happens the amp is completely disabled and you cannot troubleshoot or do the self-test. The +/- 24V and +/- 15 V values are within spec on the power supply.
After this problem presented itself the first time the amp came back online after a prolonged period of letting it sit. I tested it thoroughly with both the self-test into a triax probe as well as running lots of gradient heavy experiments. The amp passed every test and was used for a few weeks at which point it again went out with the same error overnight when it was not being used. A few more times of miraculously resurrecting itself has finally resulted in Lazarus being truly dead.
I would appreciate greatly if anyone has any information about how to troubleshoot further or perhaps even a fix.
Thanks,
Greg
_______________________________
Gregory L. Helms, Ph.D.
Manager, Center for NMR Spectroscopy
PO Box 644630
Washington State University
Pullman, WA 99164-4630
(509) 335-3005 voice
(509) 335-8867 FAX
greg_helms_at_wsu.edu<mailto:greg_helms_at_wsu.edu>
http://nmrc.chem.wsu.edu<
http://nmr.chem.wsu.edu/>
Received on Tue Jul 29 2014 - 09:06:52 MST