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Who do you ask the meter mnf or the ct mnf?

 

What is an analog meter?
And a digital meter?
And a portable meter?
I see this meter classes ...what exactly is that?
I noticed two types of meters: Direct and indirect reading meters...what is that?

Direct means one does not need an interface module to modify the signal into a measuring value that the meter is designed for.

Indirect meters does require such an interface module.

For AC voltage they are called PT - Potential transformers and AC current they are CT - Current Transformers. 

Peculiarly DC voltage does not have a designed commercially available voltage transducer because one geerally purchase a DC meter wih the correct DC voltage input but easy enough

 - if accuracy is not critical - we could use a resistive network to drop the voltage.

But DC current does have a shunt to measure higher currents - indirectly.

What does the DC shunt do? 

 

When I was looking for the IEC table here is some clever people regarding this topic

CT IEC table:

https://electrical-engineering-portal.com/direct-indirect-measurements

 

CTs and harmonics:  https://www.researchgate.net/publication/267573427_A_practical_approach_to_evaluation_of_accuracy_of_inductive_current_transformer_for_transformation_of_distorted_current_higher_harmonics

 
 

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