Measurement-computing USB-1208FS-Plus-OEM Bedienungsanleitung PDF herunterladen (Seite 16)

USB-1208FS-Plus-OEM User's Guide Functional Details

Figure 9 shows an ideal, error-free transfer function. The typical calibrated accuracy is range-dependent. Refer

to the

Accuracy specifications on page 20 for more information. We use a ±10 V range here as an example of

what you can expect when performing a measurement in this range.

Figure 9. Ideal ADC transfer function

The offset error is measured at mid-scale. Ideally, a zero volt input should produce an output code of 2048. Any

deviation from this is an offset error.

Figure 10 shows an example of a transfer function with a ±9.77 mV offset error. Offset error affects all codes

equally by shifting the entire transfer function up or down along the input voltage axis.

The accuracy plots in Figure 10 are drawn for clarity and are not drawn to scale.

Figure 10. 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 11 shows the transfer function with gain error. Gain error is easily converted to voltage by multiplying

the full-scale (

FS) input by the error.

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