DAQ VXI-SC-1102 Bedienerhandbuch PDF herunterladen (Seite 20)

Chapter 1 MIO and AI Devices

National Instruments Corporation 1-3 DAQ Hardware Overview Guide

Note Terms such as ADC resolution and analog trigger are defined in the Glossary.

E Series Data Acquisition

The E Series devices can perform single-channel data acquisitions and

multiple-channel scanned data acquisitions. For single-channel data

acquisition, select a single analog input channel and gain setting. The

device performs a single A/D conversion on that channel every sample

interval.

For multiple-channel scanned data acquisition, the device scans a set of

analog input channels, each with its own gain setting. In this method, a scan

sequence indicates which analog channels to scan and the gain settings for

each channel. The length of this scan sequence can be 1 to 512 channel/gain

pairs. For the PCI-6110E and the PCI-6111E each channel can appear only

once in the scan sequence.

During scanning, the analog input circuitry performs an A/D conversion on

the next entry in the scan sequence. The device performs an A/D conversion

once every sample interval. For maximum performance, this operation is

pipelined so that the device switches to the next channel while the current

A/D conversion is performed. The device waits for a specified scan interval

before scanning the channels again. The channels are scanned repeatedly at

the beginning of each scan interval until the required number of samples

has been acquired. For example, you can scan a sequence of four channels

once every 10 s. The device could sample the channels at the beginning of

the 10 s interval, within 20 µs, with a 5 µs sample interval between

channels. If you set the scan interval to 0, the scan sequence starts over

again immediately at the end of each scan sequence without waiting for a

scan interval. The 0 scan interval setting causes the device to scan the

channels repeatedly as fast as possible.

Note The 611X devices sample all channels simultaneously. The scan interval controls the

sampling rate, therefore the scan interval of zero is not allowed.

DAQCard-6023E 16 12 0.5, 1, 10, 100 ±5 2048 no

DAQCard-6024E 16 12 0.5, 1, 10, 100 ±5 2048 no

DAQCard-6062E 16 12 0.5, 1, 2, 5, 10,

20, 50, 100

±5 8192 yes

Table 1-1. MIO and AI Multifunction I/O Device Analog Input Characteristics (Continued)

Device

Number

Channels

ADC

Resolution

(Bits)

Gains Range (V)

Input

FIFO

(Words)

Hardware

Analog

Trigger

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 150 151

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