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Keithley DMM6500 recording Two Measurements

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gogoman:
Hello, I have not used a Keithley DMM6500 and was wondering  can the DMM6500 record both voltage and temperature. if so what is required to do so.  Would the DAQ6510 be a better choice.

The voltage ands temperature  is sample rate is  1 to 2 millisecond for a total time of 12hrs. I assume that the data  will need to be dump to a host computer periodically.

your input is appreciated

gogo
 

RBBVNL9:
Dear Gogoman,

The DMM6500 is not primarily designed to do two measurements at once. As explained this the below video, it can do so to some degree, but dependent on the precise setting, this comes with limitations.

https://youtu.be/Z7sYUL85jTc

So, I would not recommend purchasing the DMM6500 when the (main) use case is making several measurements at once. Having that said, the DMM6500 is a great and very flexible meter for single measurements!

Hydron:
I'm assuming you want independent measurements of temperature and DCV? Not for instance the calculated temperature and the measured voltage of a thermocouple?
If it's the former then you're out of luck unless you use a scanner card (and in ms range you'd need a solid state one, and I'm still not sure you could switch fast enough even then) or possibly using the DCV ratio function to read DCV off both the force and sense inputs (it can be configured to give more output info than just the ratio).

The secondary measurement function only really works when:
a) the measurement inputs are independent or somewhat so, e.g. DCV and DCI, Freq and ACV
b) you don't need a range switch that uses a relay, unless you're happy to have it clicking away using up relay life (maybe OK for long integration times or for short-term use)
c) you're not making a measurement where the use of one function can cause offsets in the other due to internal configuration (e.g. DCI and some DCV ranges)

MegaVolt:

--- Quote from: gogoman on November 14, 2022, 02:01:42 am ---Hello, I have not used a Keithley DMM6500 and was wondering  can the DMM6500 record both voltage and temperature. if so what is required to do so.  Would the DAQ6510 be a better choice.
--- End quote ---
If I don't confuse anything. Dual measurement data is not available remotely.

thm_w:

--- Quote from: Hydron on November 15, 2022, 11:34:56 am ---I'm assuming you want independent measurements of temperature and DCV? Not for instance the calculated temperature and the measured voltage of a thermocouple?
If it's the former then you're out of luck unless you use a scanner card (and in ms range you'd need a solid state one, and I'm still not sure you could switch fast enough even then) or possibly using the DCV ratio function to read DCV off both the force and sense inputs (it can be configured to give more output info than just the ratio).

The secondary measurement function only really works when:
a) the measurement inputs are independent or somewhat so, e.g. DCV and DCI, Freq and ACV
b) you don't need a range switch that uses a relay, unless you're happy to have it clicking away using up relay life (maybe OK for long integration times or for short-term use)
c) you're not making a measurement where the use of one function can cause offsets in the other due to internal configuration (e.g. DCI and some DCV ranges)

--- End quote ---

Temperature measurements in the ms range, highly unlikely its actually needed but who knows..


--- Quote from: MegaVolt on November 15, 2022, 12:34:57 pm ---
--- Quote from: gogoman on November 14, 2022, 02:01:42 am ---Hello, I have not used a Keithley DMM6500 and was wondering  can the DMM6500 record both voltage and temperature. if so what is required to do so.  Would the DAQ6510 be a better choice.
--- End quote ---
If I don't confuse anything. Dual measurement data is not available remotely.

--- End quote ---

Isn't secondary measurement just swapping back and forth? So reading one, changing then reading the other, via scpi, would be the same thing no?

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