Analog Input Filter - National Instruments PXIe-4310 User Manual

Chapter 2 Using the PXIe-4310
Choose an input range that matches the expected input range of your signal. A large input range
can accommodate a large signal variation, but reduces the voltage resolution. Choosing a smaller
input range improves the voltage resolution, but may result in the input signal going out of range.
The PXIe-4310 module uses a calibration method that requires codes
Note
(typically about 5% of the codes) outside of the specified range. This calibration
method improves absolute accuracy, but it decreases the nominal resolution of input
ranges by about 5% over what the formula shown above would indicate.
Table 2-1 shows the input ranges and resolutions supported by the PXIe-4310 module.
Table 2-1. PXIe-4310 Input Range and Nominal Resolution
Input Range
-10 V to 10 V
-5 V to 5 V
-2 V to 2 V
-1 V to 1 V

Analog Input Filter

The PXIe-4310 has selectable filter settings per channel. Each channel can independently be set
to one of the three available lowpass filter settings: 10 kHz, 100 kHz, and Disable. The 10 kHz
and 100 kHz filters are 2-pole Butterworth filters, and their designation refers to the -3 dB
cut-off frequency. The Disable setting bypasses the filters and allows measurements in the full
bandwidth of the PXIe-4310.
2-6 | ni.com
Nominal Resolution Assuming 5% Over Range
320 μV
160 μV
64 μV
32 μV