Thanks to everyone who replied, both on AMMRL and privately.
The “why” is me being (over)protective of an older probe in a multi-user
environment. For example, our 15N channel has a PICS limit of 240 W where as
our acceptance p90 power is 100 W, so I’d prefer that to be the software
limit. But, as Clemens noted, POWCHK won’t protect against long durations
at 100 W, so this is still not
My concern here is simply being (over)protective of an older probe in a multi-user
environment. For example, our 15N channel has a PICS limit of 240 W, but our
acceptance p90 power is 100 W, so I’d prefer that to be the software limit.
However, as Clemens noted, this still won’t prevent a user from mis-setting
a long pulse at 100 W.
It seems the options are to request a new PICS file or to disconnect the PICS c
able—losing ATMM/ATMA capability in the process—and define the probe and
power settings manually.
Thanks again,
Sameer
P.S. I explored adding an if statement to Avance.incl to check the power level
and abort the experiment if was too high, but could not find a way to make that work.
--
Sameer Al-Abdul-Wahid, Ph.D. | Manager
Nuclear Magnetic Resonance Centre | University of Guelph
519-824-4120 ext. 58914 | s.wahid_at_uoguelph.ca
http://nmr.uoguelph.ca/
> From: main_at_ammrl.groups.io on behalf of Anklin, Clemens via groups.io
> Date: Thursday, February 27, 2025 at 19:25
> To: main_at_ammrl.groups.io
> Subject: Re: [AMMRL] Limiting pulse power on Bruker AV III with PICS probe
Sameer
my first question would be, why do you want to limit the power to below what
PICS allows. The PICS power levels are safe for the probe. These entries define
the highest power the probe can tolerate. Of course there are durations that
might be unsafe to your samples. Setting a pulse to several seconds at maximum
power will also not be healthy for the system.
I would not recommend to put an attenuator between frequency source and amplifier.
This would no longer guarantee a linear behavior over the power range.
Best regards
Clemens
On 2/27/2025 2:41 PM, Sameer Al-Abdul-Wahid via groups.io wrote:
Hi everyone,
For a Bruker AV III console and TopSpin 3.6.5, and using a PICS probe, does
anyone know a way to limit the pulse power for a specific nucleus and/or channel?
I know some specific solutions exist (add code to the pulprog, or edit edprobe
for non-PICS probes) but I’m searching for a method that would work on a PICS
probe and across all experiments.
Thanks,
Sameer
--
Sameer Al-Abdul-Wahid, Ph.D. | Manager
Nuclear Magnetic Resonance Centre | University of Guelph
519-824-4120 ext. 58914 | s.wahid_at_uoguelph.ca
http://nmr.uoguelph.ca/
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Received on Fri Feb 28 2025 - 11:27:44 MST