Propscope Calibration

Greg LaPollaGreg LaPolla Posts: 232
edited 2020-05-10 04:16 in Accessories
I recently picked up a new in the box Propscope on eBay for a price I couldn't resist. Going though the understanding signals text and It seems the calibration is off.
Trying to run Activity #1 Ground Test Chanel 1 reports 38.9mV and channel 2 is alternating between 19.5mV and 39mV. It should be showing 0 volts.

Same thing happens with removing the probes from the scope.

I cant find any information on calibration. Did I get a dud or is this fixable ?


  • I have a prop scope and have not seen that. It seems odd to me that you get the same readings without the probes connected.

    Well after hooking my unit up and shorting the leads I see a reading of 24mv and 26.8mv. Since I don't use my scope to read voltages I never checked that.

  • WhitWhit Posts: 4,154
    edited 2020-06-08 00:23
    What version of the Propeller Tool are you using? I was doing a little snooping on this issue and notice this on the product info page here -

    "Note: It is recommended that current Propeller users upgrade the Propeller Tool to version 1.2.7 or higher, to prevent conflicts with the PropScope."

    The most current version is 1.3.2 and can be found here -

    It would not hurt to make sure you have the most current version of the PropScope USB Oscilloscope Software - you can find version 2.07 here -

    If you still have issues, I recommend you contact Parallax Tech Support. They should be able to help you sort this out.
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