National Instruments NI 9219 - Manual (Page 12)

NI 9219 Operating Instructions 12 ni.com
NI 9219 Timing Options
The NI 9219 supports four different timing options that are
optimized for different types of applications by using different
ADC conversion times. High Speed is optimized for high speed at
the expense of noise rejection, Best 60 Hz Rejection is optimized
for rejection of 60 Hz noise, Best 50 Hz Rejection is optimized for
rejection of 50 Hz noise, and High Resolution is optimized for
maximum overall noise rejection and provides good rejection of
50 Hz and 60 Hz noise. Refer to the
Specifications section for more
information.
NI 9219 Circuitry
The NI 9219 is channel-to-channel isolated. Four 24-bit
analog-to-digital converters (ADCs) simultaneously sample all
four analog input channels. An excitation circuit is enabled for all
input modes that require excitation. The ADC and excitation
circuits are reconfigured in each mode to accommodate each type
of sensor. Refer to Figure 5 for an illustration of the input circuitry
for one channel of the NI 9219.