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Last Post 09/27/2010 9:43 AM by  Tony Hodges
Question about Vmax RMS
 1 Replies
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Eric Sandeen
New Member
New Member

09/24/2010 9:13 AM
    I'm using a pair of CR8410-1000 CTs to monitor a circuit in a distribution panel, which will not exceed 15A (15A breakers)
    Therefore these 20A Ir CTs seemed to be the right choice.

    I wish to measure their output via an ADC which has an input range of 0-5V, and therefore I've biased the input by 2.5V.

    I notice, however, that the CR8410-1000 CTs have a Vmax of 2.1Vrms, and the datasheet suggests that the burden resistor should be chosen to limit V across it such that V < Vl < Vmax.

    In other words, the Vrms across my burden resistor will be quite a bit smaller than the ADC's range, thus reducing my measurement resolution.

    What's the right solution here, should I choose something like the 50A CR8449-1000 with a higher Vmax? What happens if a larger burden resistor is used with the CR8410, does it just go nonlinear in the output, burn up, or what? :)

    Tony Hodges
    CRM Staff
    Basic Member
    Basic Member

    09/27/2010 9:43 AM
    Dear Sir,

    Thank you for your interest in our product lines. The correct current transformer for your application is our CR8448-2000.
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