National Instruments NI 9225E Manuale utente

OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9225E

3-Channel, 300 Vrms, 24-Bit, Simultaneous,

Channel-to-Channel Isolated Analog Input Module

NI 9225E Operating Instructions and Specifications 2 ni.com

This document describes how to use the National

Instruments 9225E and includes dimensions, terminal assignments,

and specifications for the NI 9225E. 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 9225E. The end-product supplier is responsible

for conformity to any and all compliance requirements.

Caution The NI 9225E must be installed inside a suitable

enclosure prior to use. Hazardous voltages may be present.

NI 9225E Dimensions

The following figure shows the dimensions of the NI 9225E.

Figure 1. NI 9225E Dimensions in Millimeters (Inches)

73.4 (2.89)

0.0 (0.00)

26.7 (1.05)

58.4 (2.30)

66.0 (2.60)

0.0 (0.00)

NI 9225E Operating Instructions and Specifications 4 ni.com

Connecting the NI 9225E

The NI 9225E has three 2-terminal detachable screw-terminal

connectors that provide connections for three simultaneously

sampled, isolated analog input channels.

Figure 2. NI 9225E Terminal Assignments

AI0+

AI0–

AI1+

AI1–

AI2+

AI2–

You can connect ground-referenced or floating signal sources to

the NI 9225E. 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 9225E, 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 9225E. Refer to the Specifications section for more

information about operating voltages and overvoltage protection.

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 9225E.

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

grounded and floating signal sources to the NI 9225E.

NI 9225E Operating Instructions and Specifications 6 ni.com

Figure 3. Connecting a Grounded Signal Source to the NI 9225E

Figure 4. Connecting a Floating Signal Source to the NI 9225E

NI 9225E

Signal

Source

AI–

–

AI+

NI 9225E

Signal

Source

AI–

–

AI+

The NI 9225E 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 three channels simultaneously. Refer to

Figure 5 for an illustration of the circuitry for one channel of

the NI 9225E.

Figure 5. Input Circuitry for One Channel of the NI 9225E

NI 9225E

AI+

AI–

ADC

Amplifier

Overvoltage

Protection

Prefilter

NI 9225E Operating Instructions and Specifications 8 ni.com

Understanding NI 9225E Filtering

The NI 9225E 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 9225E 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 9225E 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 9225E.

Figure 6. Typical Passband Response of the NI 9225E

Frequency/Data Rate

0.50.4

0.025

0.000

–0.025

–0.050

0.30.20.10

Gain (dB)

NI 9225E Operating Instructions and Specifications 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 9225E 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 9225E Data Rates

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

of the NI 9225E. The NI 9225E 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 9225E with other

modules that use master timebases to control sampling, all of the

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