hi ti,
could you give me a new beta version of the Multi-Cal PGA309 software. i download oid version , but that one just sopport DMM 34401, thank you !
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hi ti,
could you give me a new beta version of the Multi-Cal PGA309 software. i download oid version , but that one just sopport DMM 34401, thank you !
Hello Yao,
You can download the installer for version 2.1 of the Multi-Cal PGA309 software here: http://bit.ly/1IE8amm
If you prefer to use the source code, download it here: Multi_CAL_PGA309.zip
Best regards,
Ian Williams
Linear Applications Engineer
Precision Analog - Op Amps
Thank you Ian, I was able to download it and install it. I'll be testing the setup later this week.
Regards,
Greg
Hello Greg,
I believe you have an error in your gain and offset calculation. With input (x) of 2.5V to 4.5V, gain (m) = 2.5, and offset (b) = -2.5, the output (y) is as follows:
y = m*x + b
y = 2.5*(2.5V, 4.5V) - 2.5V
y = (6.25V, 11.25V) - 2.5V
y = 3.75V, 8.75V
You instead need a gain of 2.5 and an offset of -6.25V. If your secondary amplifier is working as you say, then it shouldn't need adjustment. Simply adjust your offset to -6.25 in the pre-cal file and try a new calibration.
Best regards,
Ian Williams
Hi Ian,
When I run the multi-cal software and use 1 to 7 temperature points everything works great, however when I try to do 8 temperature points it seems like the eeprom doesn't get written correctly.
I also noticed on the tab labeled OVER TEMPERATURE RESULTS only has 7 visible temperature points for each sensor, even though I have run 8 temperature points.
Is this a bug?
All of the cal data is written to a .xls spreadsheet, but I can't figure out how to import that into the multi-cal software so that I can try to re-write the data.
Do you have any suggestions?
Thanks,
Greg
Hi Ian,
Yes, we are trying to build the table with 8 discrete temperatures.
We are using the PGA309-HT from -65F to +176F, with this wide temperature band we do see a performance increase with more temperature points.
Thanks.
Greg
Hi Ian,
Yes, the bridge sensor is located close enough to the PGA309 that the PGA309 and associated components see the full temperature.
We have experimented and successfully used both the internal temperature mode as well as an external temperature sensor in external mode; both giving similar results as far as the temperature compensation of the amplified output.
I was experimenting to see if more than 7 temperature data points would give us better results when I ran into this issue with the 8 temperature data points.
Thanks,
Greg