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Kabron

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Posts posted by Kabron

    AD2 & Waveforms Script Question

    in Test and Measurement

    Posted · Edited by Kabron

    I guess that corresponding part of example should be corrected in Waveforms Help, because now it looks like ravings of a madman🙂

    Quote

    The following code creates a custom waveform and sets it to be further used.

    wave = Array()
    for(var i = 0; i   wave.push(0)
      wave.push(i/10)
    }

    And on this page also:

    https://digilent.com/reference/software/waveforms/waveforms-3/reference-manual?redirect=1#code

    Suggestion for improving the impedance analyzer

    in Test and Measurement

    Posted · Edited by Kabron

    Definitelly I do not understand something.

    In script mode Impedance.run() command blocked execution, so it's impossible to do anything till it stops.

    In Custom script mode StaticIO object does not recognized:

    Quote

    Uncaught exception at <anonymous script, id=1900244763712>:5: ReferenceError: Can't find variable: StaticIO

    Generally, all I want to do is:

     While Impedance measurements running at every step get DUT Ch2+ voltage in the form of Vrms, Vreal, VImag or something acceptible. If it is < some preset switch to lower Rref(by activating corresponding DIO) and vice versa.

    Or if events Resistor too small/high are available make the same actions based on them. 

    Suggestion for improving the impedance analyzer

    in Test and Measurement

    Posted · Edited by Kabron

    Thanks a lot, Attila. That is right and I did not notice. After calibration everything work allmost exactly as with Jaxbird's software. The only thing I could not realize is how to switch automatically reference resistors. They are controlled via DIO1-3. I suspect it could be done via custom mode script, but I could not find how to operate with measurements and controls inside this mode.

    Suggestion for improving the impedance analyzer

    in Test and Measurement

    Posted · Edited by Kabron

    Hi, there

    I made Impedance Analyzer adapter according Jaxbird from eevblog.

    It works fine with Jaxbird's software.

    Now I tried to adapt it for WaveForms AI. I made the following adjustments:

    1. 1+Res 2+ DUT -1-2 GND configuration.

    2. Channel2 Attenuation: 0.0625 (As Opamps give 16x Gain);

    3. Reference Resistors: 34, 500, 5000 Ohm.

    4. Open/Short calibrations for all Ref Resistors.

    Now I'm observe strage things:

    L and C measurements in Meter mode works fine in compare with Jaxbird's software.

    R measurements are 0.8 of the real values.

    Could not realize the reason. Maybe somebody will...

     

    Also, there is a strange difference in graphic and Meter measurements:

    in Meter at 2MHz  |Z|, Rs, Rp are allmost equal to real resistance value, but in graphic they are much lower. 

     

    Meter.jpg

    Analyzer.jpg

    Suggestion for improving the impedance analyzer

    in Test and Measurement

    Posted · Edited by Kabron

    Hi, there

    I made Impedance Analyzer adapter according Jaxbird from eevblog.

    It works fine with Jaxbird's software.

    Now I tried to adapt it for WaveForms AI. I made the following adjustments:

    1. W1 1+Res 2+ DUT -1-2 GND configuration Amplitude: 0.2V .

    2. Channel2 Attenuation: 0.0625 (As Opamps give 16x Gain);

    3. Reference Resistors: 34, 500, 5000 Ohm.

    4. Open/Short calibrations for all Ref Resistors.

    Now I'm observe strage things:

    L and C measurements in Meter mode works fine in compare with Jaxbird's software.

    R measurements are 0.8 of the real values.

    Could not realize the reason. Maybe somebody will...

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