I bought an isolator which has input for 4-20mA and output 4-20mA. I notice there is a zero and span adjustment. The manual didn't indicate how to go about adjusting the zero and span. Does anyone know how do it? Appreciate someone could give me some simple procedure or examples of explaining the tuning of zero and span.
Hi how come,
Although I am not sure which Brand of Isolator you are using, however irrespective of that I may give you some information which might be useful for you.
AS you mentioned there are two types of adjustment.
So lets see what does it mean!
Zero Adjustment pot:
You would need to adjust this pot for adjusting your zero point, For example when you are supplying 4mA as an input, you would need to make sure that you would get 4mA as an output,
If the output is lesser or more than 4 mA then you would need to adjust the zero pot so that you can get the 4 mA output at 4 mA input.
Span is when you give 20 mA Input to Isolator then at output you should get 20mA, if not then you would have to adjust the span pot in order to get that.
I hope that clarifies you.
If not then wait for other members to post their views.