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Last Post 06/30/2014 10:31 AM by  Tony Hodges
Measuring AC Voltage with CR4850-500
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Kristin Chew
New Member
New Member
Posts:2


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06/29/2014 11:30 PM
    Hi,

    I would like to ask more advise on how to verify the output of the Voltage Transducer CR4850-500? The datasheet stated that the DC output is proportional to the AC voltage input. My question is:

    1. The output from pin 7-9 (L1-N, L2-N, L3-N) is in DC or AC?

    2. The output value is giving out 0-5 VDC after measuring the input VAC? So, for example if my max voltage is 240 VAC, the transducer will output 5VDC? Is there any graph showing the linearity of the input and output voltages?

    3. After obtaining the output in DC, how do I convert it back to AC value to verify my results?

    Thanks.

    Regards,
    Kristin
    Tony Hodges
    CRM Staff
    Basic Member
    Basic Member
    Posts:154


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    06/30/2014 10:31 AM
    Dear Kristen,

    1) The output from pins 7-9 on the CR4850 is referenced as L1-L2, L2-L3 and L3-L1. If you need referenced to Neutral please review the attached pdf for our CR4870 Series.
    2) The transducers are linear from 10% to full scale. If the transducer is scaled for 500Vac the output will read 0Vac = 0Vdc, 250Vac = 2.5Vdc and 500Vac = 5Vdc. Anything below 50Vac is not in the linear range. However, you will receive a repeatable output that you can calibrate for.
    3) Use a volt meter and touch the probes to the Pins 1 thru 3 to verify input voltage against the corresponding output reading from Pins 7-9.
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