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Temp reading (thermistor) breaks with 1.7.0e

DMM7510 7½-Digit Graphical Sampling Multimeter
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essele
Posts: 8
Joined: May 16th, 2020, 3:12 am
Country: United Kingdom

Temp reading (thermistor) breaks with 1.7.0e

Post by essele » May 16th, 2020, 3:20 am

Hi,

I've just received my 7510, which came with 1.6.7d firmware. I've been doing some measurements with a 5k thermistor, and that was working fine.

After upgrading to 1.7.0e the main reading is now displayed in kC which is really not helpful, with the default three decimal places that's only a 1 degree resolution, rather than 0.1mK in the previous firmware.

The readings are correct in the graphs and a bit mixed in the stats (see attached.)

Am I missing something, or is this a firmware bug?

Thanks,

Lee.
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Ilya Grudovik
Posts: 40
Joined: October 30th, 2018, 1:54 pm
Country: Belarus

Re: Temp reading (thermistor) breaks with 1.7.0e

Post by Ilya Grudovik » May 16th, 2020, 2:32 pm

In the settings, select 7.5 digits instead of the default 3.5.
Kilo degrees is a feature of the firmware :(

essele
Posts: 8
Joined: May 16th, 2020, 3:12 am
Country: United Kingdom

Re: Temp reading (thermistor) breaks with 1.7.0e

Post by essele » May 17th, 2020, 4:49 am

Thanks .. I hadn't realised this device was designed to measure the temperature of the surface of the sun!

I've only had the thing two days and I've found about 8 bugs in the firmware already. I switched from a 34470a and whilst the feel and quality of the hardware seems better, the firmware is absolutely awful.

Andrea C
Keithley Applications
Keithley Applications
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Re: Temp reading (thermistor) breaks with 1.7.0e

Post by Andrea C » May 22nd, 2020, 6:02 am

I confirm the RTD display oddities with firmware 1.7.0e on DMM7510.
Oddly enough, at same firmware level on DMM6500, it is OK.
I'll open an official bug report for it on the DMM7510 for thermistor and RTD temperature reporting.

Andrea C
Keithley Applications
Keithley Applications
Posts: 1442
Joined: October 15th, 2010, 10:35 am
Country: United States
Contact:

Re: Temp reading (thermistor) breaks with 1.7.0e

Post by Andrea C » July 31st, 2020, 5:09 am

Firmware 1.7.3e for DMM7510 has been released. It contains a fix for the temperature bug.
Download the firmware here:
https://www.tek.com/search?keywords=dmm ... &sort=desc

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