Campbell-scientific CS10-L and CS15-L Current Transformers Instrukcja Użytkownika Pobierz pdf (Strona 25)

Appendix A. Theory of Operation

A.4 Multiplier

Use Equation D to calculate the multiplier.

m=C*n

*(1/R)*(1 V/1000 mV) Equation D

Where, C = a correction constant

If we assume a correction constant of 1, then we can solve for the equation

from the above information.

m = 1 * 2000/1 * (1/10) * (1/1000) = 0.2 multiplier

A.5 CS10/CS15 Comparison

The CS10 consists of a CR Magnectic’s CR8459 Current Transducer with a

10-ohm burden resistor incorporated into its cable (see Figure A-7). The

resistor allows most of our dataloggers to measure it.

CS10-L

FIGURE A-7. CS10 schematic

The CS15, a modified version of the CS10, was developed specifically for the

CR200(X)-series dataloggers. CR200(X)-series dataloggers require special

treatment because they cannot measure negative values; range is only 0 to

2500 mV (see Figure A-9). To create positive reference, the CS15-L uses

Voltage Excitation to shift the measurement range (see Figures A-8 through A-

10).

A-5

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