National Instruments NI 9234E Bedienungsanleitung

OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9234E

4-Channel, ±5 V, 24-Bit Software-Selectable IEPE and

AC/DC Analog Input Module

2|ni.com |NI 9234E Operating Instructions and Specifications

This document describes how to use the National Instruments 9234E

and includes dimensions, connector assignments, and specifications

for the NI 9234E. 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 9234E. The end-product

supplier is responsible for conformity to any and all

compliance requirements.

Caution The NI 9234E must be installed inside a suitable

enclosure prior to use. Hazardous voltages may be present.

Caution Do not operate the NI 9234E in a manner not

specified in these operating instructions. Product misuse

can result in a hazard. You can compromise the safety

protection built into the product if the product is damaged

in any way. If the product is damaged, return it to

National Instruments for repair.

NI 9234E Operating Instructions and Specifications|© National Instruments |3

NI 9234E Dimensions

The following figure shows the dimensions of the NI 9234E.

Figure 1. NI 9234E Dimensions in Millimeters (Inches)

73.38 (2.889)

4x Ø 3.18 (0.125)

7.33 (0.289)

0.00 (0.000)

–7.62 (–0.300)

–39.37 (–1.550)

–52.96 (–2.085)

–66.04 (–2.600)

–87.43(–3.442)

4|ni.com |NI 9234E Operating Instructions and Specifications

Connecting the NI 9234E

The NI 9234E has four BNC connectors that provide connections

to four simultaneously sampled analog input channels.

Figure 2. NI 9234E Connector Assignments

AI0+

AI0–

AI1+

AI1–

AI2+

AI2–

AI3+

AI3–

NI 9234E Operating Instructions and Specifications|© National Instruments |5

Each channel has a BNC connector to which you can connect

a signal source. You can also enable excitation current on a

per-channel basis to connect Integrated Electronics Piezoelectric

(IEPE) sensors. Refer to the NI 9234E Circuitry section for more

information. The center pin of the connector, AI+, provides the DC

excitation, when enabled, and the positive input signal connection.

The shell of the connector, AI-, provides the excitation return path

and the signal ground reference.

Connecting Signal Sources to the NI 9234E

You can connect ground-referenced or floating signal sources to

the NI 9234E. To avoid picking up ground noise, use a floating

connection. To further minimize ground noise, prevent the metal

shells of the BNC connectors from coming in contact with each

other, the modules, or the chassis.

If you make a ground-referenced connection between the signal

source and the NI 9234E, make sure the voltage on the AI- shell

is in the common-mode range to ensure proper operation of the

NI 9234E. The AI- shell is protected against accidental contact

with overvoltages within the overvoltage protection range. Refer to

the Specifications section for more information about operating

voltages and overvoltage protection.

6|ni.com |NI 9234E Operating Instructions and Specifications

Refer to Figures 3 and 4 for illustrations of connecting grounded

and floating signal sources to the NI 9234E.

Figure 3. Connecting a Grounded Signal Source to the NI 9234E

NI 9234E

AI+

AI–

–

Signal

Source

Common

Mode

Voltage

NI 9234E Operating Instructions and Specifications|© National Instruments |7

Figure 4. Connecting a Floating Signal Source to the NI 9234E

The NI 9234E can also provide an IEPE excitation current for each

channel to measure ground-referenced or floating IEPE sensors.

Typical IEPE sensors have a case that is electrically isolated from

the IEPE electronics, so connecting the sensor to the NI 9234E

results in a floating connection even though the case of the sensor

is grounded.

NI 9234E

AI+

AI–

–

Signal

Source

8|ni.com |NI 9234E Operating Instructions and Specifications

NI 9234E Circuitry

The NI 9234E analog input channels are referenced to chassis

ground through a 50 Ωresistor. To minimize ground noise, make

sure the chassis ground is connected to earth ground. Each channel

is protected from overvoltages. The input signal on each channel is

buffered, conditioned, and then sampled by a 24-bit Delta-Sigma

ADC. You can configure each channel in software for AC or DC

coupling. For channels set to AC coupling, you can turn the IEPE

excitation current on or off. Refer to the software help for

information about configuring channels on the NI 9234E.

NI 9234E Operating Instructions and Specifications|© National Instruments |9

Figure 5. NI 9234E Input Circuitry for One Channel

The NI 9234E uses common-mode bias current to bias the

current-limiting diodes when IEPE current is turned off. When the

NI 9234E is using grounded signal sources, this current causes an

error that is dependent on the AI- lead impedance. This error is

approximately 50 ppm of range and 15 ppm of reading per Ωof AI-

impedance. The common-mode bias current causes an error only

with grounded sources and is not an issue with floating signal

sources. For best accuracy, use a floating connection or use

low-impedance leads when connecting grounded signal sources.

2 mA IEPE on/off

AI+

AI–

Amplifier

and

Prefilter

ADC

–

AC/DC Coupling

NI 9234E

Common

Mode

Bias

Current

Limiting

Diodes

50 Ω

10 |ni.com |NI 9234E Operating Instructions and Specifications

Figure 6. Measurement Error Introduced by Common-Mode Bias Current

The NI 9234E also has TEDS circuitry. For more information

about TEDS, go to ni.com/info and enter rdteds.

Understanding NI 9234E Filtering

The NI 9234E 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.

NI 9234E

AI+

AI–

–

Signal

Source

AI– Lead

Impedance

Common

Mode

Bias

Current

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