National Instruments 9269E Bedienungsanleitung

OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9269E

4-Channel, ±10 V, 16-Bit, Simultaneous, Channel-

to-Channel Isolated Analog Voltage Output Module

NI 9269E Operating Instructions and Specifications 2 ni.com

This document describes how to use the National Instruments 9269E

and includes dimensions, terminal assignments, and specifications for

the NI 9269E. 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 9269E. The end-product supplier is responsible

for conformity to any and all compliance requirements.

Caution The NI 9269E must be installed inside a suitable

enclosure prior to use. Hazardous voltages may be present.

NI 9269E Dimensions

The following figure shows the dimensions of the NI 9269E.

Figure 1. NI 9269E 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 9269E Operating Instructions and Specifications 4 ni.com

Connecting the NI 9269E

The NI 9269E has four 2-terminal detachable screw-terminal

connectors that provide connections for 4 analog output channels.

Figure 2. NI 9269E Terminal Assignments

AO0+

AO0–

AO1+

AO1–

AO2+

AO2–

AO3+

AO3–

You can connect a load to each channel of the NI 9269E. Connect

the positive lead of the load to the AO+ terminal. Connect the

ground of the load to the corresponding AO– terminal. Refer to

Figure 3 for an illustration of how to connect a load to the

NI 9269E.

Figure 3. Connecting a Load to the NI 9269E

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 9269E.

The analog output channels are floating with respect to earth

ground and each other. Each channel has a digital-to-analog

converter (DAC) that produces a voltage signal. Each channel

provides an independent signal path, enabling you to update all

AO–

AO+

Load

NI 9269E

NI 9269E Operating Instructions and Specifications 6 ni.com

four channels simultaneously. Each channel also has overvoltage

and short-circuit protection. Refer to the Specifications section

for more information about the overvoltage and short-circuit

protection. Refer to Figure 4 for an illustration of the output

circuitry for one channel of the NI 9269E.

Figure 4. Output Circuitry for One Channel of the NI 9269E

When the module powers on, the channels output the startup

voltage. Refer to the Specifications section for more information

about startup voltage. Refer to the software help for information

about configuring startup output states in software. Visit

ni.com/info and enter cseriesdoc for information about

C Series documentation.

AO+

NI 9269E

Amp

Isolated

DAC

Overvoltage/

Short-Circuit

Protection AO–

Increasing Output Voltage Range

Each channel of the NI 9269E has a nominal output voltage range

of ±10 V and can drive up to ±10 mA of current. The total output

current of all channels is limited to ±20 mA. For example, if the

output current of AO0 is ±10 mA, the output current of

AO<1, 2, 3> is limited to ±10 mA total or ±3.33 mA each.

If you want to increase the nominal output voltage range, you can

cascade up to four output channels for a maximum of ±40 V

nominal. For example, if you want two channels with a nominal

output voltage range of ±20 V each, connect AO<0, 1> and

AO<2, 3> as shown in Figure 5. The output current of the cascaded

channels flows across two channels, limiting the total output

current to ±10 mA.

NI 9269E Operating Instructions and Specifications 8 ni.com

Figure 5. Increasing the Output Voltage Range of the NI 9269E

Cascading more than four output channels of multiple NI 9269E

modules violates the electrical safety and overvoltage protection

ratings.

Because the NI 9269E outputs can source and sink current, it is

not possible to increase the current drive by connecting output

channels in parallel.

AO<2, 3>–

NI 9269E

AO<2, 3>+

AO<0, 1>–

AO<0, 1>+

AO0+

AO0–

AO1+

AO1–

AO2+

AO2–

AO3+

AO3–

Load

Sleep Mode

This module supports a low-power sleep mode. Support for sleep

mode at the system level depends on the chassis that the module is

plugged into. Refer to the chassis manual for information about

support for sleep mode. If the chassis supports sleep mode, refer to

the software help for information about enabling sleep mode. Visit

ni.com/info and enter cseriesdoc for information about

C Series documentation.

Typically, when a system is in sleep mode, you cannot

communicate with the modules. In sleep mode, the system

consumes minimal power and may dissipate less heat than it does

in normal mode. Refer to the Specifications section for more

information about power consumption and thermal dissipation.

NI 9269E Operating Instructions and Specifications 10 ni.com

Specifications

The following specifications are typical for the range –40 to 85 °C

internal to any enclosures unless otherwise noted. All voltages are

relative to the AO– signal on each channel unless otherwise noted.

Output Characteristics

Number of channels.......................... 4 analog output channels

DAC resolution ................................. 16 bits

Type of DAC ..................................... R-2R

Power-on output state ....................... High impedance

Startup voltage1................................. 0 V

Power-down output state2................. High impedance

1 When the output stage powers on, a glitch occurs for 5 μs peaking at –900 mV.

2 When the module powers down, a glitch occurs for 20 μs peaking at –600 mV.

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