# Accuracy Calculation of Leakage Current for an Electrical Safety Analyzer

A

#### akmal122g

Hello. I am trying to calculate the accuracy of leakage current for an electrical safety analyzer. The accuracy for leakage current is

?5% of reading ?1mAmp DC and 48 Hz to 100 kHz

The nominal value for calibration is 0.100 mAmp. Can someone help me how to calculate the accuracy?

#### Hershal

##### Metrologist-Auditor
Staff member
Super Moderator
Based on the numbers, looks like the reading desired is 0.1mA, and the unit accuracy comes out to 0.1005mA, and that would be across the listed frequency range, and also DC.

N

Good Afternoon, This is my first attempt at answering someones question. I suggest downloading from a reliable website, one that doesn't have any viruses, "TolCal4". I have used it for a number of years now. It has its problems, but I can't do without it.

#### dgriffith

##### Quite Involved in Discussions
Hello. I am trying to calculate the accuracy of leakage current for an electrical safety analyzer. The accuracy for leakage current is

?5% of reading ?1mAmp DC and 48 Hz to 100 kHz

The nominal value for calibration is 0.100 mAmp. Can someone help me how to calculate the accuracy?
I was going to try my hand at this but hesitated because it doesn't make sense to me, else I'm missing something. I'd like to see this explained further.
Is this an AC spec within the listed frequencies, plus or minus some allowed DC offset?

My take is ?5% of reading ?1mAdc; the reading in question is the calibration input, 100 ?A (0.100 mAmp).
So, 5% of 100 ?A is 5 ?A, therefore: 100?A ?5?A

N

The calculator wants to know what is the resolution of UUT? After looking a little further, I suspect that the resolution is .001. If that is the case, then the calculation is 1.105 mA.

Last edited by a moderator:

#### dgriffith

##### Quite Involved in Discussions
Hello. I am trying to calculate the accuracy of leakage current for an electrical safety analyzer. The accuracy for leakage current is

?5% of reading ?1mAmp DC and 48 Hz to 100 kHz

The nominal value for calibration is 0.100 mAmp. Can someone help me how to calculate the accuracy?
I think Hershal had it right-- the spec should read (?5% reading ?1mAmp) at DC and from 48 Hz to 100 kHz. Makes more sense.

zakmal122g, What is this the specification of? If it's the instrument you are making the 100?A measurement with, then you have the wrong instrument. We are just estimating based on the information you gave: we're filling in the blanks, so to speak.
I wouldn't be making a 100?A measurement with something whose accuracy is 10 times greater at 1mA, no matter how many zeros/decimal places the display can indicate. It isn't good metrology.

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