File location issue for .psc

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Hominid
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File location issue for .psc

Post by Hominid »

Does anyone have experience using a scaling file for a temp/resistance table? The file's location doesn't seem to be documented in the user guide... that, along with the location of the plw.ini file as well. I have version 6 of Picolog installed, and a Windows search comes up with nothing. Is the documentation out of date perhaps?

Quote from page 122 of the Picolog User Manual: "PicoLog and other Pico software products are provided with a set of .psc files that contain scaling information on a wide range of sensors."

I see no .psc files anywhere...

Martyn
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Re: File location issue for .psc

Post by Martyn »

The PicoLog User manual is for version 5 of the software and the files would be in the installation directory. PicoLog 6 is new, and a completely different piece of software, so I will need to check on how scaling files can be used as it hasn't been asked before.
Martyn
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Martyn
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Re: File location issue for .psc

Post by Martyn »

For the DrDAQ you can create a dds file as shown in "Section 2.10.5 USB DrDAQ scaling files (.DDS)" of the DrDAQ User Guide and put this with the usbdrdaq.dll in "C:\Program Files\Pico Technology\PicoLog 6\resources"
Martyn
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Hominid
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Re: File location issue for .psc

Post by Hominid »

Martyn wrote:For the DrDAQ you can create a dds file as shown in "Section 2.10.5 USB DrDAQ scaling files (.DDS)" of the DrDAQ User Guide and put this with the usbdrdaq.dll in "C:\Program Files\Pico Technology\PicoLog 6\resources"
There's no explanation about how to enter temp / resistance values, only volts. Do I have to figure out what the volts are for each resistance value? Perhaps an example table would be helpful... what our project is using is a 4kohm thermister with a non-linear curve. Here's a snippet:


Ohms Temp
~~~~~ ~~~~
11594.72 0
9243.6 5
7422.72 10
6001.64 15
4884.44 20
4000 25
3295.16 30
2729.88 35
2273.76 40

How do I enter that into this .DDS file?

Thanks in advance...

Martyn
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Re: File location issue for .psc

Post by Martyn »

The Signal Input channel has 100 kΩ pull-up resistors to 2.5 V, so with the resistance of the RTD from the signal input to ground you have a voltage divider which will map voltage to temperature. This information can then be used in a .DDS file.
Martyn
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