Serge,
Can you display the power levels in Watts instead of dB? At least with Watts,
you have a hard number to work with, whereas dB's is a bit of a fuzzier area.
You can toggle the power display when using the 'edprosol' command.
Cryoprobes generally use a significantly lower power level on the proton channel,
compared to room temperature probes, and I suspect that your Prodigy Cryoprobe is similar.
Under the "old" Topspin / XWINNMR, -6 dB was the absolute maximum you could go.
Somewhere around 3.2 (my guess) is where the dB scale changed, which is why I
prefer using watts to measure power.
Also, can you run the "canned" pulse program DIPSI2ESGPPH? That should give
you the same information.
Ronald Shin
University of Alabama at Birmingham
Central Alabama High Field NMR Facility
________________________________
> From: main_at_ammrl.groups.io on behalf of serge_lavoie via groups.io
> Sent: Thursday, July 24, 2025 8:58 AM
> To: main_at_ammrl.groups.io <main_at_ammrl.groups.io>
> Subject: [AMMRL] a simple 2D TOCSY on a bruker cryoprobe
Hi all,
I am trying to record a basic 2D TOCSY experiment with our instrument (Bruker
Neo 500 MHz, cryoprobe prodigy BBO). For a reason i dont understand, it fails
after a few dummy scan with this error message: 'EMERGENCY-STOP activated: Peak
power limit exceeded, EmStop activated...'. I have verified that the probe was
correctly tuned and matched. I have checked that all pulse length and power
are set according to the pulse program instruction. Here a the most important
parameter i used:
* pulprog: dipsi2gpphzs
* td = 4096 x 256
* ds = 16, ns = 8
* d1 = 2 s; d9 = 80 ms
* sw = 2778 x 2778 Hz; o1p = 3.25 ppm
* p1 = 10 µs, p6 = 30 µs, p32 = 20 ms
* pldb1 = -11.92 db; pldb10 = -2.3807 db; spdb29 = 12.26 db
Note that using the same instrument, i successfully recorded 1H, 13C, hsqc,
hmbc, dqf-cosy, even hsqc-tocsy experiments. What is wrong with 2d tocsy?
Serge Lavoie
Université du Québec à Chicoutimi
Saguenay (Québec)
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Received on Thu Jul 24 2025 - 07:47:47 MST