National Instruments SCC-AI02, SCC-AI01, SCC-AI03, SCC-AI06, SCC-AI05 User Manual

...

USER GUIDE

SCC-AI Series Isolated Analog Input Modules

The SCC-AI Series isolated analog input modules can extract a relatively low-amplitude input signal from a high-common-mode voltage so the E/M Series DAQ device can measure the input signal. They also can amplify and filter the input signal, resulting in higher measurement resolution and accuracy.

SCC-AI Series modules are available in a range of gains from 0.2 to 200. They contain lowpass filters of either 10 kHz or 4 Hz bandwidth. Table 1 gives the gain and bandwidth for each module.

Table 1. SCC-AI Module Input/Output Range, Gain, and Bandwidth

Model Input Range Output Range Gain Bandwidth

SCC-AI01 ±42 Vpk/ VDC ±8.4 V 0.2 10 kHz

SCC-AI02 ±20 V ±10 V 0.5 10 kHz

SCC-AI03 ±10 V ±10 V 1 10 kHz

SCC-AI04 ±5 V ±10 V 2 10 kHz

SCC-AI05 ±1 V ±10 V 10 10 kHz

SCC-AI06 ±100 mV ±10 V 100 10 kHz

SCC-AI07 ±50 mV ±10 V 200 10 kHz

SCC-AI13 ±10 V ±10 V 1 4 Hz

SCC-AI14 ±5 V ±10 V 2 4 Hz

Conventions

The following conventions are used in this guide:

<> Angle brackets that contain numbers separated by an ellipsis represent

a range of values associated with a bit or signal name—for example, AI <0..7>.

» 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 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, or an introduction

to a key concept. Italic text also denotes text that is a placeholder for a word or value that you must supply.

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

configurable connector.

SCC SCC refers to any SCC series signal conditioning module.

SCC-AI SCC-AI refers to any isolated analog input module in the SCC-AI Series

unless otherwise noted.

SCC-AI Series Isolated Analog Input Modules User Guide 2 ni.com

What You Need to Get Started

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

❑ Hardware

– SCC-68

– 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-AI

– 68-pin E/M Series DAQ device

– 68-pin cable

– Quick Reference Label

❑ Software

– The latest version of NI-DAQmx

❑ Documentation

– SCC-AI Series Isolated Analog Input Modules User Guide

– SC-2345/2350 User Manual

– SCC-68 User Guide

– 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

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

system. Refer to the SCC-AI Module Pin Assignments section.

You can download NI documents from ni.com/manuals. To download the latest version of NI-DAQmx, click Download Software at

Device Specific Information

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

information about the SC-2345/2350 or SCC-68, refer to the SCC Quick Start Guide, available for download at

Installing the Module

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

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

You can plug the SCC-AI into any analog input socket on the SC-2345/2350 or SCC-68. The socket you choose determines which E/M Series DAQ device channels receive the SCC-AI signals.

For single-stage input conditioning, plug the SCC-AI into any slot of the SC-68, or any socket of the SC-2345/2350 J(X+1), where X is 0 to 7. Connect the input signals to the module as described in the Connecting the

Input Signals section.

ni.com/manuals.

ni.com.

If you use the SCC-AI in a dual-stage configuration in an SC-2345, the SCC-AI must be the first-stage module. Plug it into any socket J(X+9) and plug the second-stage SCC into socket J(X+1), where X is 0 to 7. Connect the input signals to the SCC-AI as described in the Connecting the Input

Signals section. The SC-2345 connects the output signals of the first-stage

SCC to the inputs of the second-stage SCC. An example of dual-stage conditioning is an SCC-AI02 followed by an SCC-FV01 frequency input module.

Sockets J9 to J16 of the SC-2345 are also available for digital input/output (DIO) conditioning or control. Refer to the SC-2345/2350 User Manual for more information about configuring, connecting, and installing SCC modules.

SCC-AI Series Isolated Analog Input Modules User Guide 4 ni.com

Connecting the Input Signals

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

confirm the signal names.

Each screw terminal on the SCC-AI is labeled by pin number <1..4>. Pins 1 and 2 form a channel routed to E/M Series DAQ device channel X+8, and pins 3 and 4 form a channel routed to the E/M Series DAQ device channel X, where X is 0 to 7 depending on the socket where you plug in the module. The SCC-AI provides channel-to-ground and module-to-module isolation only. It does not provide isolation between the two channels of the SCC-AI. Because both channels must have the same reference voltage, pins 1 and 3 are connected together internally.

Figure 1 shows the SCC-AI signal connections.

Signal

Source

–

SCC-AI

E/M Series DAQ Device

Lowpass

–

Filter

Lowpass

Filter

AI (X )

AI SENSE

AI GND

AI (X+8)

Figure 1. SCC-AI Signal Connections

The inputs are designed in a floating (nonreferenced) single-ended configuration. If the measured signals are floating, connect the negative input pins, 1 and 3, to AI SENSE on the SC-2345/2350 terminal block or AI GND on the SC-68, through a 10 kΩ to 100 kΩ resistor. Figure 2 shows a floating signal connection on one channel of the SCC-AI.

+ 9 hidden pages