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  • Author Author: Jan Cumps
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Keithley DMM6500 Scanner Card - wiring

Jan Cumps
Keithley DMM6500 Scanner Card - wiring

I road tested the  Keithley Bench Digital Multimeter DMM6500. I recently purchased a 2000-SCAN 10 channel scanner card. This 2nd post shows 2 ways I wired it: for easy use and for least resistance

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Twisted pair

For my first tests I wired channel 1 and 6 with twisted pairs.

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I used these channels to do my first tests, because they allow for a few scenarios:

  • 2 x 2 wire voltage, resistance, temperature
  • 4 wire resistance
  • these channels can also measure current if you solder a shunt resistor

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I'll post my measurement of the first two scenarios later. I have no intention (yet) to place shunts on channel 1 and/or 6.

Flat flex

A convenient way to get all 10 channels out is with a flat flex. This cable gives access to all 10 in an orderly way. The copper is thinner though, and you can't twist the pairs.

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I tinned the wires before inserting them, and tried to make the whole thing neat.

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I reused a little gizmo I made years ago to break out a 2x10 connector to a breadboard:.

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Resistance, including the connections from the meter to the card, the relays, the flat flex + connector, my gizmo, a breadboard and a patch wire: 1.9 Ohm.
With the pins bridged right at the flat flex connector, it's less than 1 Ohm:

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Good enough for a lot of measurements.

link to all posts

Parents Comment Children
  • in reply to DAB

    Have you looked at stability of the measurements over time?

    No. It's the most precise instrument I have. And I don't have good standards either. I'm not able to measure deviations.
    Long time drift for this instrument is documented though, by Keithley.

    Also, the calibration for the instrument has expired. I checked what it 'd cost me to send it in to a calibration lab in Germany, but it's expensive.