National Instruments NI 9229E Manual de usuario

OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9229E/9239E

4-Channel, ±60/±10 V, 24-Bit Simultaneous,

Channel-to-Channel Isolated Analog Input Modules

NI 9229E/9239E 2 ni.com

This document describes how to use the National

Instruments 9229E and National Instruments 9239E and includes

dimensions, terminal assignments, and specifications. In this

document, the NI 9229E and NI 9239E are referred to inclusively

as the NI 9229E/9239E. Visit ni.com/info and enter

rdsoftwareversion to determine which software you need for

the modules you are using. For information about installing,

configuring, and programming the system, refer to the system

documentation. Visit ni.com/info and enter cseriesdoc for

information about C Series documentation.

Caution National Instruments makes no electromagnetic

compatibility (EMC) or CE marking compliance claims

for the NI 9229E/9239E. The end-product supplier is

responsible for conformity to any and all compliance

requirements.

Caution The NI 9229E/9239E must be installed inside a

suitable enclosure prior to use. Hazardous voltages may be

present.

NI 9229E/9239E Dimensions

The following figure shows the dimensions of the NI 9229E/9239E.

Figure 1. NI 9229E/9239E Dimensions in Millimeters (Inches)

0.0 (0.00)

26.7 (1.05)

58.4 (2.30)

66.0 (2.60)

73.4 (2.89)

0.0 (0.00)

NI 9229E/9239E 4 ni.com

Connecting the NI 9229E/9239E

The NI 9229E/9239E provides connections for four

simultaneously sampled, isolated analog input channels.

Figure 2. NI 9229E/9239E Terminal Assignments

AI0+

AI0–

AI1+

AI1–

AI2+

AI2–

AI3+

AI3–

The NI 9229E/9239E has four 2-terminal detachable

screw-terminal connectors.

Note You must use 2-wire ferrules to create a secure

connection when connecting more than one wire to a

single terminal on the NI 9229E /9239E.

You can connect ground-referenced or floating signal sources to

the NI 9229E/9239E. Connect the positive signal of the signal

source to the AI+ terminal, and connect the negative signal of the

signal source to the AI– terminal. If you make a ground-referenced

connection between the signal source and the NI 9229E/9239E,

make sure the voltage on the AI+ and AI– connections are in the

channel-to-earth safety voltage range to ensure proper operation of

the NI 9229E/9239E. Refer to the Specifications section for more

information about operating voltages and overvoltage protection.

Refer to Figures 3 and 4 for illustrations of how to connect

grounded and floating signal sources to the NI 9229E/9239E.

NI 9229E/9239E 6 ni.com

Figure 3. Connecting a Grounded Signal Source to the NI 9229E/9239E

Figure 4. Connecting a Floating Signal Source to the NI 9229E/9239E

NI 9229E/9239E

Signal

Source

AI–

–

AI+

NI 9229E/9239E

Signal

Source

AI–

–

AI+

The NI 9229E/9239E 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.

Figure 5. Input Circuitry for One Channel of the NI 9229E/9239E

NI 9229E/9239E

AI+

AI–

ADC

Amplifier

Overvoltage

Protection

Prefilter

NI 9229E/9239E 8 ni.com

Understanding NI 9229E/9239E Filtering

The NI 9229E/9239E 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 9229E/9239E 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 9229E/9239E 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 6 shows typical

passband flatness for the NI 9229E/9239E.

Figure 6. Typical Passband Flatness for the NI 9229E/9239E

Frequency/Data Rate

0.50.4

0.025

0.000

–0.025

–0.050

0.30.20.10

Gain (dB)

NI 9229E/9239E 10 ni.com

Stopband

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.

Alias-Free Bandwidth

Any signal that appears in the alias-free bandwidth of the

NI 9229E/9239E 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 equals

the data rate minus the stopband frequency.

Understanding NI 9229E/9239E Data Rates

The frequency of a master timebase ( fM) controls the data rate ( fs)

of the NI 9229E/9239E. The NI 9229E/9239E includes an internal

master timebase with a frequency of 12.8 MHz, but the module

also can accept an external master timebase or export its

own master timebase. To synchronize the data rate of an

NI 9229E/9239E with other modules that use master timebases

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