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Last Post 07/17/2014 12:01 PM by  Tony Hodges
CR6620-60-500
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Ryan Blackmon
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07/16/2014 7:53 AM
    This transducer is being used in an application to monitor a typically 60 Hz frequency. Where can I find instructions to properly calibrate this transducer?

    Have you heard of this transducer having an issue with drifting?
    Tony Hodges
    CRM Staff
    Basic Member
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    Posts:147


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    07/16/2014 8:40 AM
    Dear Sir,

    Typically calibration of AC value transducers are permanently calibrated due to the transformer based sensing topology. The circuit does not allow for drift during proper operation. It is our recommendation that the device be returned for calibration checkout. Please note that we will need to see if the device is still under warranty.

    We would also recommend that you verify the waveform of your inputs is not affecting your readings. Any power measurement device will react differently to non-pure sinusoidal waveforms. Power meters typically have bandwidth specifications, and non-pure sinusoids contain harmonics and octaves other than the fundamental 60 Hz frequency, that cause variations in the output readings. Comparing two power meters together also must be carefully evaluated, as different power meters have different bandwidths and thus can give different readings. Our power transducers have a bandwidth of 4 Khz. Chopped waveforms, triangular waveforms, and other typical modern power systems will read significantly different than a pure sinusoid.

    Please let us know how you would like to proceed.
    Ryan Blackmon
    New Member
    New Member
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    07/16/2014 1:21 PM
    Thanks for the reply. The calibration I'm referring to is in regards to the full scale and zero scale range which the spec sheet says can be customized.

    The voltage we're monitoring the frequency of is akin to 3-phase commercial power so we're not looking at a triangular waveform or anything like that.
    Tony Hodges
    CRM Staff
    Basic Member
    Basic Member
    Posts:147


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    07/17/2014 12:01 PM
    Dear Sir,

    The calibration the catalog page is referring to is performed here at our factory and not by the customer. Please let me know if you need an RMA to return the unit.
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