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Blog Keithley DMM6500 Scanner Card - temperature and 4-wire resistance continuous measurements
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  • Author Author: Jan Cumps
  • Date Created: 6 Mar 2023 9:20 PM Date Created
  • Views 1501 views
  • Likes 9 likes
  • Comments 5 comments
  • 88ad1490-a97d-11ed-afa1-0242ac120002
  • 2000-scan
  • dmm6500
  • keithley
  • scan-2000
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Keithley DMM6500 Scanner Card - temperature and 4-wire resistance continuous measurements

Jan Cumps
Jan Cumps
6 Mar 2023
Keithley DMM6500 Scanner Card - temperature and 4-wire resistance continuous measurements

I road tested the  Keithley Bench Digital Multimeter DMM6500. I recently purchased a 2000-SCAN 10 channel scanner card. This 4th post shows a continuously running script that logs temperature and 4-wire resistance with the scanner card.

image

Test Setup

I'm trying to measure the shortcut-resistance of a connector on a PCB, related to the temperature of the PCB. The board is heated from room temperature to 65°C. A thermocouple is connected to channel 2 of the switch card. The 4-wire to channel 5 and 10.

image

The scan config:

  • chan 2: Temp, thermocouple, K, simulated cold junction temp 21°C, label temp
  • chan 5: 4 Wire Res, 1 Ohm, label res 
  • scan: infinite, interval 5 s

image

image

image

I start the scan, and llet the temperature ramp up to 65°, then ramp down again

Results

I stored the data on a memory stick and used a spreadsheet to draw a graph:

image image

I also used the DMM6500 graph options to show individual channels, and both together in various setups.

image

image

image

image

All graphs, from spreadsheet and DMM6500, are based on the same data.

data: defbuffer1_0306_212839.zip

link to all posts

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  • javagoza
    javagoza over 2 years ago in reply to Jan Cumps

    Scream

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  • Jan Cumps
    Jan Cumps over 2 years ago in reply to Jan Cumps

    www.thermocoupleinfo.com/type-k-thermocouple.htm

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  • Jan Cumps
    Jan Cumps over 2 years ago

    Rant after the facts:

    image

    Halfway my exercise I had to take the scan card out and switch the 2 wires of the thermocouple. The temperature was dropping below 0° when I heated the PCB.

    K-type wiring has yellow +, red -. Rage

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  • Jan Cumps
    Jan Cumps over 2 years ago in reply to javagoza

    Yes, although I don't know what I'm measuring. I think it's an interesting exercise to show what the DMM6500 and scanner card can do.

    But I have no clue what I'm measuring. Could be the copper, the connector, the contacts. Or maybe it's the resistance change in the chunk of alu foil that I used to create the connector short. That's why I don't document this as a post related to the connector series that I'm writing.

    It doesn't matter - I just wanted to try out the scanner options. That works very well.

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  • javagoza
    javagoza over 2 years ago

    Thanks for sharing! It's interesting, the relationship between the change in temperature and the change in electrical resistance seems somewhat linear.

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