Am 23.11.2012 09:20, schrieb David Nečas (Yeti): > On Thu, Nov 22, 2012 at 11:23:29PM +0100, Martin Engler wrote: >> For me calculating the factor using the following formula >> yields the correct result: >> >> q = 20.0/2^DAC_bits * ZPiezoconst * GainZ * Angstrom/DAC_Unit > One more thing, do you know how to convert current values? > > I implemented the import of all channels from Createc files in 2.30 > (Gwyddion used to load just the first) but since I did not know how to > convert the values anyway, all channels are converted using the same > formula now. > > Regards, > > Yeti The DAC_Unit is just the Createc DAC unit, so in the code it should just be ...*Angstrom.
For the current channel: sorry I did not look into this, but I believe you must convert the internal Createc units to Volts and multiply the voltage with the preamp gain which is some 10^x A/V. The value of x is stored in the field "Gainpreamp / GainPre 10^". But you should check this as I do not usually record the current in my measurements. Martin -- Martin Engler Universität zu Köln II. Physikalisches Institut Zülpicher Str. 77 50937 Köln, Deutschland Telefon: +49 221 470-3658 Telefax: +49 221 470-5178 ------------------------------------------------------------------------------ Monitor your physical, virtual and cloud infrastructure from a single web console. Get in-depth insight into apps, servers, databases, vmware, SAP, cloud infrastructure, etc. Download 30-day Free Trial. Pricing starts from $795 for 25 servers or applications! http://p.sf.net/sfu/zoho_dev2dev_nov _______________________________________________ Gwyddion-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/gwyddion-users
