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CRO probes calibration

Discussion in 'General Electronics Discussion' started by pradeepa kumar, Nov 4, 2014.

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  1. pradeepa kumar

    pradeepa kumar

    Nov 4, 2014
    Hi, can anybody tell me how to calibrate a CRO probe? Also, is calibrating and compensating the probe both same? Kindly reply if you know about it. Thank you.
  2. hevans1944

    hevans1944 Hop - AC8NS

    Jun 21, 2012
    Most CROs have a fixed-gain or CAL position on each input channel sensitivity control. An internal calibration potentiometer can tweak the CAL position to produce a specific sensitivity, such as 20 mV per division. Many CROs provide a square wave signal to check the CAL position sensitivity, but that too needs calibration (infrequently) by an instrument calibration service.

    Compensating a probe applies only to probes that provide attenuation of the input signal, typically 10X and 100X attenuation. Compensation is not the same as calibration. Compensation (or frequency compensation) is a capacitor adjustment that allows the probe to pass a band of frequencies without appreciable attenuation discrepancies as a function of frequency. You make the adjustment by connecting the probe to a fast rise-time square-wave signal source, adjusting the compensation capacitor for maximal flatness of the waveform, neither over-shoot nor rounding the edges of the pulses. There usually is no attenuation calibration adjustment. You can determine the actual probe and CRO sensitivity if you have a square-wave pulse generator whose peak-to-peak amplitude is accurately known.
    pradeepa kumar and KrisBlueNZ like this.
  3. pradeepa kumar

    pradeepa kumar

    Nov 4, 2014
    I got the difference now. Thank you so much.
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