Chapter 3 Hardware Overview©National Instruments Corporation3-7PCI-MIO E Series User ManualTable 3-3 shows the overall input range and precision according to theinput range configuration and gain used.Considerations for Selecting Input RangesWhich input polarity and range you select depends on the expectedrange of the incoming signal. A large input range can accommodate alarge signal variation but reduces the voltage resolution. Choosing asmaller input range improves the voltage resolution but may result inthe input signal going out of range. For best results, match the inputrange as closely as possible to the expected range of the input signal.For example, if you are certain the input signal will not be negative(below 0 V), unipolar input polarity is best. However, if the signal isnegative or equal to zero, you will get inaccurate readings if you useunipolar input polarity.Table 3-3. Actual Range and Measurement Precision,PCI-MIO-16XE-10 and PCI-MIO-16XE-50RangeConfigurationGain Actual Input Range Precision10 to +10 V 1.02.05.0210.020.0250.02100.00 to +10 V0 to +5 V0 to +2 V0 to +1 V0 to +500 mV0 to +200 mV0 to 100 mV152.59 μV76.29 μV30.52 μV15.26 μV7.63μV3.05 μV1.53 μV-10 to +10 V 1.02.05.0210.020.0250.02100.0-10 to +10 V-5 to +5 V-2 to +2 V-1 to +1 V-500 to +500 mV-200 to +200 mV-100 to +100 mV305.18 μV152.59 μV61.04 μV30.52 μV15.26 μV6.10 μV3.05 μV1 The value of 1 LSB of the 16-bit ADC; that is, the voltage incrementcorresponding to a change of one count in the ADC 16-bit count.2 PCI-MIO-16XE-10 onlyNote: See Appendix A, Specifications, for absolute maximumratings.
