This circuit is design for milivolt meter circuit. This circuit is using LM11. This circuit has requirements analogous to those discussed for the ammeter. This is the figure of the circuit;
In the most-sensitive position, the range resistor is zero and the input resistance equals R1. As voltage measurement is desensitized by increasing the range resistor, the input resistance is also increased, giving the maximum input resistance consistent with zero stability with the input open. Thus, at full-scale, the source will be loaded by whatever multiple of the noise current is required to give the desired open-input zero stability.
[Schematic circuit source: National Semiconductor Notes]
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