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| Keithley DMM6500 recording Two Measurements |
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| MegaVolt:
--- Quote from: thm_w on November 16, 2022, 11:01:45 pm ---There are two ADCs inside, but, one is not terribly accurate (16-bit digitizer). So any main measurement is done on the main ADC. But, as mentioned above there is that Ratio function that can measure the voltage on the Sense and Input terminals, simultaneously: https://www.tek.com/en/blog/measuring-power-using-your-keithley-dmms-ratio-function --- End quote --- The ratio measurement is performed by the main ADC and can be selected remotely. And also the data gets into two different buffers and can be requested remotely. --- Quote ---So maybe I'm wrong there. But if you are measuring simultaneous Voltage and Current, NOT using a shunt, its just going to be switching between the inputs and performing another conversion. --- End quote --- Yes, it is fast switching between inputs. But you cannot select dual measurement mode remotely. I didn't find any commands that allow you to do this. Those. mode you must select and configure manually. |
| Hydron:
If you already have a DMM6500 just build or buy a scanner card for it, the hook both temperature and voltage measurement stuff to it and use that. Ideally use a voltage-output temperature transducer (e.g. TC and ref junction) so you're not needing to switch between measurement modes inside the meter as well. If you want fast switching then SSR based card is better (not sure if you can buy these or it's DIY only). Note that you cannot switch between front and rear inputs remotely (it's a physical switch), so everything needs to be connected to the scanner. |
| Kleinstein:
A 1-2 ms time scale is quite fast, even for the electronic / photo-MOS switches. Especially the temperature is rarely needed that fast. One may get away with the DMM6500 reading voltage and another cheaper, slower meter to read the temperature. The hardware may be capable to do 2 measurements essentially simultaneous, but the software support is missing. The Keithley 2100 may have been the better option - that meter support dual measurements, especially thermocouple plus something else. |
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