DAQ VXI-SC-1102 Manual de Instruções Página 24

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Chapter 1 MIO and AI Devices
©
National Instruments Corporation 1-7 DAQ Hardware Overview Guide
rateNotSupportedError. This typically occurs if you specified a timebase
of 5 (100 Hz) and a sample interval of 100, for example, for a resulting
sample interval of 1 s. This generates an error because the sample interval
counter rolls over before 1 s.
Note The 611X devices use the scan interval counter to control the acquisition rate. The
sample interval counter does not affect conversion timing since all channels are sampled
simultaneously. The pipelined ADC used on 611X devices requires four conversions before
the first sample becomes available; therefore, if you are using external conversions, you
should allow for this behavior.
E Series Data Acquisition Rates
Refer to the appropriate user manual for single-channel and
multiple-channel DAQ rates and settling accuracy.
If you are using SCXI with your DAQ device, refer to the SCXI Data
Acquisition Rates section in Chapter 3, Software Overview, of the NI-DAQ
User Manual for PC Compatibles, for the effect of SCXI module settling
time on your data acquisition device rates.
MIO Device Analog Output
The MIO devices contain two analog output channels numbered 0 and 1.
Each analog output channel contains either a 12-bit DAC or a 16-bit DAC,
depending on the AO resolution of your device. You can configure each
analog output channel for unipolar or bipolar voltage output except on the
MIO-16XE-50 and the 611X devices, which are always in bipolar mode.
An onboard voltage reference of +10 V is available for the analog output
channels. An external reference voltage signal can also drive the analog
output channels except on the MIO-16XE-10, MIO-16XE-50 and the 611X
devices. See the
AO_Configure function in the NI-DAQ Function
Reference Online Help or the
AO_Configure.vi in the LabVIEW DAQ
Online Reference for more information about configuring the DACs.
Note The 611X devices require an even number of samples in the waveform buffer due to
a 32-bit wide output FIFO necessary for high-speed data transfers.
MIO Device Waveform Generation
The Waveform Generation functions can write values to either one or both
analog output channels continuously using an onboard or external clock to
update the DACs at regular intervals. The values are contained in a buffer
that you allocate and fill. The resultant voltages produced at the analog
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