Dear All,
Happy Holiday week! we need some help on our EPR here. it might be a
console or computer interface problem but we're not sure.
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Symptoms:
I was able to get the correct EPR spectra out of a few nitronyl nitroxides
if I pressed the "slow" button under "Accumulate" on the console (located
on the oscilloscope's unit) and then pressed "run" to collect the data on
the program. Normally, the "slow" button under "Record" is selected and so
the computer is able to control the EPR data collection, this way it seems
as though the EPR is being told manually via the console to sweep the field
and the the computer just is collecting the output.
So someone who just needs to determine if a nitronyl nitroxide is present
is able to. However, the spectrum seemed to have unusual and strong noise,
they look like data points that were collected or transmitted to the
computer improperly because they fell outside of the range of just
background noise.
Also, running the EPR this way doesn't line up the magnetic field correctly
for the spectrum, which I know isn't reliable anyway without a standard,
but when multiple scans are run, the EPR will run multiple scans, but it
seems to start slightly earlier (or runs continuously) than the computer
data recording doesn't line-up appropriately with the collection and each
subsequent spectrum is offset by about 50 Guass from the previous.
I tried following the cables that would seemingly be involved in these
processes and there is nothing apparent that is wrong (unplugged, frayed,
etc.), but I don't know enough about the hardware or how to test individual
parts to isolate the problem more than that.
Any suggestions?
Many thanks in advance!
Jennifer
Received on Mon Nov 21 2016 - 08:24:32 MST