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Micael Moreau

Micael Moreau

加入日期/時間: 2024/5/18

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  • RE: Keithley 2750 DAQ DMM w/ 7702 MUX DAQ card. Detecting shortcuts in multiple pairs.

    Wed, 20 Nov 2024 23:28:29 GMT – Keithley 2750 DAQ DMM w/ 7702 MUX DAQ card. Detecting shortcuts in multiple pairs.

    Hi Hamza, yes i was able to do what i needed by using the Current sense pin.

    [see the attached picture.]

    I send 3V3 by CH.43, i use channel 21-40 only as switches.
    And 1-20 as readings with ground as common.
    In my Python code i :
    - click ch.21
    - loop read 1 to 8, and make sure only 1 has voltage.
    - do that for all channels.

    Need pull-down resistors or you have floating-residual-capacitive-voltage-stuff readings.

    Alright?

  • Keithley 2750 DAQ DMM w/ 7702 MUX DAQ card. Detecting shortcuts in multiple pairs.

    Sat, 18 May 2024 18:13:25 GMT – Keithley 2750 DAQ DMM w/ 7702 MUX DAQ card. Detecting shortcuts in multiple pairs.
    Hi,

    I really hope someone can help me with that.

    I want to test continuity in 4 wires (which is easily done)
    All 4 channels resistance tests will return  < 1 ohm. if all ok.

    And then detect possible shortcut fails between those 4 wires : (attached picture 1)

    Like for example, checking between 13-H to 14-H, 13-H to 15-H, etc.
    In fact, if im not wrong, to check any possible shortcuts, i need to make sure i get infinite ohms between all combinations.

    Is it possible with this card ?? : (attached picture 2)


    Thank you so much.
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