Dear Serge
probably reducing pldb1 by about 1 or 2 db and adjusting the p1 accordingly
should clear the error. It originates in the preamplifier where a overactive
sensor sends out this error.
At -10.92dB your p1 would be 10.9 usec and at 10db even you would use 12.5 usec.
All other pulses and power levels stay the same.
The Watts and dB's are actually strictly correlated. The correct unit is -dBW.
This means that 0dB = 1W, -10dB = 10W, 10dB = 0.1 W, 20dB = 0.01W etc.
Regards
Clemens
On 7/24/2025 9:58 AM, serge_lavoie via groups.io wrote:
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)
--
==========================
==========================
====================
Clemens Anklin Ph.D. Vice President
Bruker BioSpin NMR Applications & Training
15 Fortune Drive NEW Phone: 978-313-5NMR(5667)
Billerica MA 01821 bluesky: _at_canklin.bsky.social
web: http://www.bruker.com
e-mail: clemens.anklin_at_bruker.com
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Received on Thu Jul 24 2025 - 10:44:57 MST