National Instruments Isolated Analog Output Module SCC-AO10 Bedienungsanleitung

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USER GUIDE

SCC-AO10 Isolated Analog

Output Module

The SCC-AO10 is an isolated voltage output module with an output range

of ±10 V. The output voltage level is controlled by the DAC output of an

E/M Series DAQ device. You can increase the output voltage level to

±20 V by connecting two SCC-AO10 modules in series.

Conventions

The following conventions are used in this guide:

»The »symbol leads you through nested menu items and dialog box options

to a final action. The sequence File»Page Setup»Options directs you to

pull down the File menu, select the Page Setup item, and select Options

from the last dialog box.

This icon denotes a note, which alerts you to important information.

This icon denotes a caution, which advises you of precautions to take to

avoid injury, data loss, or a system crash. When this symbol is marked on

the product, refer to the Read Me First: Safety and Radio-Frequency

Interference document, shipped with the product, for precautions to take.

When symbol is marked on a product it denotes a warning advising you to

take precautions to avoid electrical shock.

When symbol is marked on a product it denotes a component that may be

hot. Touching this component may result in bodily injury.

bold Bold text denotes items that you must select or click in the software, such

as menu items and dialog box options. Bold text also denotes parameter

names.

italic Italic text denotes variables, emphasis, a cross-reference, an introduction

to a key concept, or text as it appears on a hardware label. Italic text also

denotes text that is a placeholder for a word or value that you must supply.

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SCC-AO10 Isolated Analog Output Module User Guide 2 ni.com

monospace Text in this font denotes text or characters that you should enter from the

keyboard, sections of code, programming examples, and syntax examples.

This font is also used for the proper names of disk drives, paths, directories,

programs, subprograms, subroutines, device names, functions, operations,

variables, filenames, and extensions.

SC-2345 SC-2345 refers to both the SC-2345 connector block and the SC-2345 with

configurable connectors.

SCC SCC refers to any SCC Series signal conditioning module.

What You Need to Get Started

To set up and use the SCC-AO10, you need the following items:

❑Hardware

– SC-2345/2350 with one of the following:

• SCC-PWR01

• SCC-PWR02 and the PS01 power supply

• SCC-PWR03 (requires a 7 to 42 VDC power supply,

not included)

– One or more SCC-AO10

– 68-pin E/M Series DAQ device

– 68-pin cable

– Quick Reference Label

❑Software

– The latest version of NI-DAQmx

❑Documentation

– SCC-AO10 Isolated Analog Output Module User Guide

– SC-2345/2350 User Manual

– SCC Quick Start Guide

– Read Me First: Safety and Radio-Frequency Interference

– Documentation for your hardware

– Documentation for your software

❑Tools

– 1/8 in. flathead screwdriver

– Numbers 1 and 2 Phillips screwdrivers

– Wire insulation stripper

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©National Instruments Corporation 3 SCC-AO10 Isolated Analog Output Module User Guide

Note Software scaling of measurements is not supported on the Macintosh operating

system. Refer to the SCC-AO10 Connector Pin Assignments section.

You can download NI documents from ni.com/manuals. To download

the latest version of NI-DAQmx, click Download Software at ni.com.

Device Specific Information

Note For general SCC module installation and signal connection information, and

information about the SC-2345/2350 carrier, refer to the SCC Quick Start Guide, available

for download at ni.com/manuals.

Installing the SCC-AO10

Caution Refer to the Read Me First: Safety and Radio-Frequency Interference document

before removing equipment covers or connecting/disconnecting any signal wires.

Plug the SCC-AO10 into either SC-2345/2350 analog output socket

J(X+17), where Xis 0 or 1. The SC-2345/2350 routes the voltage output of

E/M Series DAQ device analog output channel AO (X) to the SCC-AO10.

Connecting the SCC-AO10 to a Load

Caution Refer to the Read Me First: Safety and Radio-Frequency Interference document

before removing equipment covers or connecting/disconnecting any signal wires.

Note The signal names have changed. Refer to ni.com/info and enter rdtntg to

confirm the signal names.

The SCC-AO10 has a three-pin screw-terminal connector that accepts

28 to 16 AWG wires.

The screw terminals are labeled by pin numbers 1 to 3. Pin 1 is the isolated

ground. Pins 2 and 3 both connect to the isolated voltage output for

flexibility in field wiring.

Caution Connecting an external voltage source to the output terminals of the SCC-AO10

may damage the module.

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SCC-AO10 Isolated Analog Output Module User Guide 4 ni.com

Figures 1 and 2 show the SCC-AO10 connected to a nonreferenced load

and to a load with a high common-mode voltage.

Figure 1. SCC-AO10 Connected to a Nonreferenced Load

Figure 2. SCC-AO10 Connected to a Load with a High Common-Mode Voltage

Connecting Two SCC-AO10 Modules in Series

You can increase the maximum total output voltage to ±20 V by connecting

two SCC-AO10 modules in series. Plug the two modules into sockets J17

and J18 of the SC-2345/2350, and wire the modules to a load as shown in

Figure 3.

AO GND

SCC-AO10

E/M Series

DAQ Device

AO (X )

Load

AO GND

SCC-AO10

E/M Series

DAQ Device

AO (X )

Load

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©National Instruments Corporation 5 SCC-AO10 Isolated Analog Output Module User Guide

Figure 3. Connecting Two SCC-AO10 Modules in Series

The SC-2345/2350 routes the E/M Series DAQ device analog output

channels AO 0 and AO 1 to the SCC-AO10 modules, and the resulting

maximum output voltage range is ±20 V. Refer to Figure 3 and use the

following formula to calculate the total output voltage from both

SCC-AO10 modules:

where

VOutTotal is the total output voltage from both SCC-AO10 modules

VOUT1 is the voltage across terminals 1 and 3 of the SCC-AO10

module in socket J17

VOUT2 is the voltage across terminals 1 and 3 of the SCC-AO10

module in socket J18

For information about how to configure the SCC-AO10 module with

NI-DAQmx, refer to the SCC Quick Start Guide.

SCC-AO10 in Socket J18

SCC-AO10 in Socket J17

Load

AO GND

E/M Series

DAQ Device

AO 0

AO GND

AO 1

VOUT2

VOUT1

–

VOutTota

–

VOutTotal VOUT1 VOUT2

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SCC-AO10 Isolated Analog Output Module User Guide 6 ni.com

Using the SCC-AO10

This section contains information regarding scaling voltage measurements

and isolated ground references.

Scaling Voltage Measurements

The SCC-AO10 is a ±10 V isolated analog output module. The output

voltage is controlled by an E/M Series DAQ device AO output channel,

AO (X). The relationship between the AO (X) voltage level and the output

voltage level of the SCC-AO10 is a one-to-one linear relationship. That is,

where

VAO(X) is the AO 0 voltage level

VAO10 is the SCC-AO10 voltage output in volts

Isolated Ground Reference

Each SCC-AO10 module is referenced to its own isolated ground. Each

isolated ground can have up to 60 VDC of common-mode voltage between

itself and any other channel ground or chassis ground. Refer to the

Connecting the SCC-AO10 to a Load section for ways to use the isolated

ground in signal connections.

Calibrating Gain and Offset Errors

The SCC-AO10 is calibrated at the factory before shipment. To adjust the

gain and offset of the SCC-AO10 in your system using an E/M Series DAQ

device, you need a voltage meter and a 1/8 in. flathead screwdriver. Before

adjusting the SCC-AO10, allow 30 minutes for the DAQ device to warm

up to its nominal operating temperature.

To adjust the gain and offset of the SCC-AO10, complete the following

steps:

1. Disconnect the load from the SCC-AO10 you want to calibrate.

2. Set an output range of –10 to +10 V for AO (X), the E/M Series DAQ

device channel connected to the SCC-AO10.

3. Connect the negative lead of the voltmeter to the isolated ground

terminal (pin 1) and the positive lead to the voltage output terminal

(pin 2 or 3) of the SCC-AO10.

4. Using your software, set AO (X) to output 0 VDC.

VAO X() VAO10

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©National Instruments Corporation 7 SCC-AO10 Isolated Analog Output Module User Guide

5. Adjust the offset potentiometer on the top of the SCC-AO10 until the

voltmeter reads 0 VDC ±100 μV. The offset is now calibrated.

6. Using your software, have AO (X) output 9.9 VDC.

Adjust the gain potentiometer on the top of the SCC-AO10 until the

voltmeter reads 9.9 VDC. The gain is now calibrated.

Specifications

These ratings are typical at 25 °C unless otherwise stated.

Electrical

Number of output channels .................... One nonreferenced (floating)

Input range ............................................. ±10 V

Output range........................................... ±10 V

Current drive .......................................... ±30 mA

Gain nonlinearity.................................... 0.5% of full-scale output range

Output noise ........................................... 2.5 mVrms typ; 4 mVrms max

Bandwidth .............................................. >23 kHz

Slew rate................................................. 1 V/μs

Short circuit protection

Current ............................................ 37 mA max

Duration .......................................... Unlimited

Load impedance ..................................... 10,000 pF max

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Power Requirement

Analog power .........................................180 mW max at full load

172 mW max with no load

+15 V ...............................................6 mA max at full load

5.73 mA max with no load

–15 V ...............................................6 mA max at full load

5.73 mA max with no load

Digital power (+5 V) ..............................1.15 W max at full load

600 mW max with no load

+5 V .................................................230 mA max

120 mA max with no load

Physical

Figure 4. SCC-AO10 Dimensions

Weight ....................................................28 g (1.0 oz)

I/O connectors.........................................One 20-pin right-angle male

connector; one 3-pin screw

terminal

Field-wiring diameter .............................28 to 16 AWG

1.87 cm

(0.74 in.) 7.93 cm

(3.12 in.)

3.55 cm

(1.4 in.)

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©National Instruments Corporation 9 SCC-AO10 Isolated Analog Output Module User Guide

Maximum Working Voltage

(Signal + common-mode) each input should remain within 42.4 Vpeak or

60 VDC of ground.

Maximum working voltage refers to the signal voltage plus the CMV.

Channel-to-earth (inputs) ....................... 42.4 Vpeak or 60 VDC,

Measurement Category I

Caution This device is rated for Measurement Category I and is intended to carry signal

voltages no greater than 42.4 Vpeak or 60 VDC. Do not use this device for connection to

signals or for measurements within Categories II, III, or IV.

Isolation Voltage

Channel-to-earth isolation

Continuous ...................................... 60 VDC,

Measurement Category I

Withstand ........................................ 2300 Vrms verified by a 5 s

dielectric withstand type test

Environmental

Operating temperature............................ 0 to 50 °C

Storage temperature ............................... –20 to 70 °C

Humidity ................................................ 10 to 90% RH, noncondensing

Maximum altitude .................................. 2,000 m

Pollution Degree (indoor use only) ........ 2

Stability

Recommended warm-up time ................ 10 min (30 min for connected

E/M Series DAQ device)

Output offset drift................................... 300 μV/°C

Gain temperature coefficient.................. 300 ppm/°C

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