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<p>Hi Henrik,</p>
<p> I agree with Filipe that the time at which the actual measurement begins is the more reasonable interpretation for scan_start.</p>
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<p>Cheers,</p>
<p>Ben<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> NeXus <nexus-bounces@shadow.nd.rl.ac.uk> on behalf of Filipe Maia via NeXus <nexus@shadow.nd.rl.ac.uk><br>
<b>Sent:</b> Friday, 9 July 2021 9:38:03 AM<br>
<b>To:</b> Discussion forum for the NeXus data format<br>
<b>Cc:</b> Filipe Maia; nexus@nexusformat.org<br>
<b>Subject:</b> Re: [Nexus] Question about start_time field</font>
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<div dir="ltr">Hi Henrik,
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<div>I think setting it to when the actual scan starts is the more logical choice.</div>
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<div>Cheers,</div>
<div>Filipe</div>
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<div dir="ltr" class="gmail_attr">On Fri, 9 Jul 2021 at 09:33, Henrik Enquist via NeXus <<a href="mailto:nexus@shadow.nd.rl.ac.uk">nexus@shadow.nd.rl.ac.uk</a>> wrote:<br>
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<p>Hi,</p>
<p>We are looking at the nexus output of Sardana, and a question came up about the exact meaning of scan_start.<br>
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<p><a href="https://manual.nexusformat.org/classes/applications/NXscan.html#nxscan-entry-start-time-field" rel="noopener noreferrer" id="gmail-m_-3070433393699801957LPlnk346098" target="_blank">https://manual.nexusformat.org/classes/applications/NXscan.html#nxscan-entry-start-time-field</a></p>
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<p>We have the choice of setting it to the exact time when the user started the scan macro, or when the actual scan starts. The documentation linked above does not mention any details. In many cases these two will be so close that it doesn't make any practical
difference. But if for example a large prescan snapshot is taken, then they can be a number of seconds apart.</p>
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<p>So the question is, which time should we put in the start_time? The time when the user pressed the button, or the time when the scan started running? </p>
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<div>I tried sending this yesterday but I probably did it a little too early, before my registration on the list was completed. Sorry if this causes any noise.<br>
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<p>Cheers,</p>
<p>Henrik<br>
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<div>----<br>
Dr. Henrik Enquist<br>
Control Software Engineer<br>
MAX IV Laboratory<br>
Fotongatan 2<br>
221 00, Lund<br>
Sweden<br>
<br>
Phone: +46 (0)272 15 45 45<br>
Email: <a href="mailto:henrik.enquist@maxiv.lu.se" target="_blank">henrik.enquist@maxiv.lu.se</a><br>
Web: <a href="http://www.maxiv.lu.se" target="_blank">www.maxiv.lu.se</a></div>
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