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Blog Keithley DMM6500 Scanner Card - 2-wire and 4-wire resistance measurements
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  • Author Author: Jan Cumps
  • Date Created: 10 Feb 2023 12:27 PM Date Created
  • Views 1564 views
  • Likes 12 likes
  • Comments 3 comments
  • 88ad1490-a97d-11ed-afa1-0242ac120002
  • 2000-scan
  • dmm6500
  • keithley
  • scan-2000
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Keithley DMM6500 Scanner Card - 2-wire and 4-wire resistance measurements

Jan Cumps
Jan Cumps
10 Feb 2023
Keithley DMM6500 Scanner Card - 2-wire and 4-wire resistance measurements

I road tested the  Keithley Bench Digital Multimeter DMM6500. I recently purchased a 2000-SCAN 10 channel scanner card. This 3rd post shows the 2-wire and 4-wire resistance measurement mode with the scanner card.

image

10 2-wire or 5 4-wire channels

The SCAN-2000 has 10 channels. They can all be assigned to different measurements. For this post, I'll check the resistance modes. You can use each channel individually to measure 10 resistors in a single scan. Or you can pair channels  (1 with 6, 2 with 7, ...) and measure 5 resistors in 4-wire mode in a scan.
A combination is also possible. In the screen grab at the top of this post, channel 1 and 6 are paired for 4-wire mode, and channel 2 is in 2-wire mode. During a scan, the DMM6500 will switch to the correct mode for each configuration.

All measurements in this post include the extra resistance from the relay, test leads and contact resistance with a breadboard. But you 'll see that the 4-wire mode lessens those impacts.

2-wire

In the first test, I measured the resistance of a patch wire in a breadboard. On channel 1: 1.4Ω. 

image

4-wire

Here, I measure that same patch wire in 4-wire mode. On channel 1 and 6 paired: 0.4Ω. 

image

mixed

In this test, I have set:

  • channel 1+ 6 in 4 wire, measuring a patch wire's resistance in 4-w
  • channel 2: a 10K resistor in 2-w
  • channel 3: a patch wire in 2-w:

image

link to all posts

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

    This family also has a data acquisition device (similar specs as this meter, but it can retrieve data from way more test points), a source meter and a power supply.
    An impressive product line.

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  • DAB
    DAB over 2 years ago

    Nice update Jan.

    You now have a very accurate meter to play with.

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  • bidrohini
    bidrohini over 2 years ago

    WoW! So it's a multimeter? Looks like a oscilloscope. 

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