Acqiris SA230E User Manual page 57

Managing ADC signal potential overrange
An overrange condition occurs when the signal amplitude is larger than the ADC module full scale
range.
It results in clipping the ADC sample value to its maximum.
Shifting the input signal with the channel offset control or simply acquiring signal with amplitude close
to the selected FSR can results in an overrange condition.
The ADC module is able to detect and report if such an event occurs during the acquisition. Due to
maximum input voltage requirements and to the resulting clipped sample data, the default driver
behavior is to return an error in such a condition.
Note, that the acquired data are still available for read (see example below).
It is also possible to disable the overrange detection.
Due to the internal ADC frequency response superior to 0 dB for high-frequencies (see above the Bode
plot without equalization), there is a risk of signal overrange at the ADC output, even if the input signal
is included within the ADC module FSR.
The equalization mode has not impact on any overrange condition.
Driver property / attribute and usage example
By default, the ErrorOnOverrangeEnabled property is set to true (default). In that case, all Fetch
and Read methods return an error if one or more samples were in overranged.
To read/fetch data despite the overrange, the property must be set to false, and the read/fetch
methods must be called again (See example below).
If the ErrorOnOverrangeEnabled property is set to false, and one or more samples were in
overranged, the driver doesn't return any error.
The check of potential overrange is sensitive to channel input also outside acquisition window. If an
error on overrange occurs outside of the acquisition window, user can still fetch the data after
setting the ErrorOnOverrangeEnabled property to false.
Acqiris SA230E User's Manual
4.4 Equalization
57