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Description
Overview
Essential details：NI-9227 Isolated Analog Input Module
The NI 9227 has four 2-terminal detachable screw-terminal connectors that provide connections for four simultaneously sampled, isolated analog input channels.
Refer to Figures 3 and 4 for illustrations of how to connect grounded and floating current sources to the NI 9227.
The NI 9227 analog input channels are floating with respect to earth ground and each other. The incoming analog signal on each channel is conditioned, buffered, and then sampled by a 24-bit
Delta-Sigma ADC.
Each channel provides an independent signal path and ADC, enabling you to sample all four channels simultaneously. Refer to Figure 5 for an illustration of the circuitry for one channel of the NI 9227.
If an application is subject to high vibration, National Instruments recommends that you either use ferrules to terminate wires to the detachable screw-terminal connector or use the NI 9971 backshell kit to protect the connections. Refer to Figure 6 for an illustration of using ferrules. Refer to Figure 1 for an illustration of the NI 9971 connector backshell.
Any signal that appears in the alias-free bandwidth of the NI 9227 is not an aliased artifact of signals at a higher frequency. The alias-free bandwidth is defined by the ability of the filter to reject frequencies above the stopband frequency, and it is equal to the data rate minus the stopband frequency.
NI-9227
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NI-9227 Isolated Analog Input Module
The NI 9227 uses a combination of analog and digital filtering to provide an accurate representation of in-band signals while rejecting out-of-band signals. The filters discriminate between signals based on the frequency range, or bandwidth, of the signal.
The three important bandwidths to consider are the passband, the stopband, and the alias-free bandwidth.
The NI 9227 represents signals within the passband, as quantified primarily by passband flatness and phase nonlinearity. All signals that appear in the alias-free bandwidth are either unaliased signals or signals that have been filtered by at least the amount of the stopband rejection.
Passband
The signals within the passband have frequency-dependent gain or attenuation. The small amount of variation in gain with respect to frequency is called the passband flatness. The digital filters of the
NI 9227 adjust the frequency range of the passband to match the data rate. Therefore, the amount of gain or attenuation at a given frequency depends on the data rate. Figure 7 shows typical passband flatness for the NI 9227.
The filter significantly attenuates all signals above the stopband frequency. The primary goal of the filter is to prevent aliasing.
Therefore, the stopband frequency scales precisely with the data rate.
The stopband rejection is the minimum amount of attenuation applied by the filter to all signals with frequencies within the stopband.
