Functioning
* Measuring the effective value of current in electrical circuit.
* Measuring the circumference of the circuit is separated from the power indicator.
* Index marked TrueRMS fitted with a transducer gives the correct value of the effective value of current intensity at deformed runs.
Implementation
DMA indicators are intended for current transformers with a rated secondary current of 5A. The current range for these transformers is from 25 to 1000/5 A. The primary value of the transformer’s current specifies the maximum measured current and the actual current value displayed by the indicator.
The DMA-20A and DMA-3 20A are intended for direct measurements (without transformers applied) within the range of 0÷20 A.
Order labeling method:
INDIRECT MEASUREMENT (with transformers applied)
DMA- X Y /5A Z
| X One phase: 1 |
Y Primary value of the transformer’s current :25, 30, 40, 50, 70, 75, 80, 100, 120, 125, 150, 160, 200, 250, 300, 400, 500, 600, 700, 750, 800, 900, 1000. |
Z True RMS |
Example:
* DMA-150/5A a one-phase device for 50/5A transformer, measurement range at 0÷50A, no TrueRMS;
DIRECT MEASUREMENT (without transformers)
| X One phase: 1 |
Z True RMS |
Example
* DMA-1 20A – one-phase device for 20A, measurement range 0÷20A, without TrueRMS
* DMA-1 20A TrueRMS – one-phase device for 20A, measurement range 3×0÷20A, with TrueRMS
