Weidmuller DPAMAS - Universal glavanically isolated signal co Manual do Utilizador descarregar pdf (Página 23)

Internal Adjustments (Input balancing)

This control allows for component

tolerances that would otherwise give

unequal outputs with both inputs at 4 mA

nd with both inputs at 20 mA.

1. Remove the electronics from the case

and connect up as shown above.

Set up two multimeters to measure the

voltages across terminals 4 & 3 and

terminals 4 & 2.

3. With both milliamp sources at 4.00 mA,

adjust the VR1 on the personality card

until both voltages are equal.

. Repeat the adjustment with both milliamp sources at 20.00 mA.

5. Repeat 3 & 4 until no further improvements can be made.

+–

DPA/MAS

2 4

DC mA

source

+–

DC mA

source

VR1

. . . . . . . .

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Weidmuller DPAMAS - Universal glavanically isolated signal co Manual do Utilizador Página 23