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flective target until the sensor’s response is near its maximum; then the gain is reduced by one step and the response to the same target measured on the lower gain.
This allows calculating the ratio of the two gains from
Rg =
Gg
Gg
=
1
S (g) S D (g)
.
S ( g 1) S D ( g 1)
Once all four ratios are known, the specific G values are determined by defining Gg
as 1 for the setting g in effect when µ is measured (g = 1 or 2). That is, if µ was measured on gain 1,
G1 = 1
G2 = R2
G3 = R2R3
G4 = R2R3R4
G5 = R2R3R4R5
If µ was measured on gain 2,
G1 = 1/R2
G2 = 1
G3 = R3
G4 = R3R4
G5 = R3R4R5.
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