User Manual

RedLab 1208LS User's Guide Functional Details
23
The accuracy plots in Figure 12 are drawn for clarity and are not drawn to scale.
-FS
+FS
Inp ut Volta g e
0
4095
2
Offset= 9.77mV
Ideal
Ac tua l
Output Code
9.77mV
2048
Figure 12. ADC transfer function with offset error
Gain error is a change in the slope of the transfer function from the ideal, and is typically expressed as a
percentage of full-scale. Figure 13 shows the RedLab 1208LS transfer function with gain error. Gain error is
easily converted to voltage by multiplying the full-scale (FS) input by the error.
The accuracy plots in Figure 13 are drawn for clarity and are not drawn to scale.
-FS
+FS
Inp ut Volta g e
0
4095
Ac tua l
Id e a l
Output Code
Gain error=+0.2%, or +20 m
V
Gain error= -0.2%, or -20 mV
2048
Figure 13. ADC Transfer function with gain error