National Instruments SCC-ACC01 Manuale utente

USER GUIDE

SCC-ACC01 Accelerometer Input

Module

The SCC-ACC01 accelerometer (ACC) input module accepts an active

accelerometer input signal, passes it through a 0.8 Hz highpass filter,

amplifies it, and then passes it through a 19 kHz lowpass Bessel filter and

an output buffer. The module has a fixed gain of 2, so the maximum input

range is ±5 V. The SCC-ACC01 also provides a 4 mA current source for

accelerometer excitation.

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,

P0.<3..0>.

»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.

SCC-ACC01 Accelerometer Input Module User Guide 2 ni.com

bold Bold text denotes items that you must select in 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. This font 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. 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.

©National Instruments Corporation 3 SCC-ACC01 Accelerometer Input Module User Guide

What You Need to Get Started

To set up and use the SCC-ACC01, you need the following items:

❑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-ACC01

❑SCC-ACC01 Accelerometer Input Module User Guide

❑Read Me First: Safety and Radio-Frequency Interference

❑SC-2345/2350 User Manual, available at ni.com

❑SCC Quick Start Guide, available at ni.com

❑SC-2345 Quick Reference Label

❑68-pin E Series DAQ device, documentation, and 68-pin cable

❑1/8 in. flathead screwdriver

❑Numbers 1 and 2 Phillips screwdrivers

❑Wire insulation strippers

❑NI-DAQ (current version) for Windows 2000/NT/XP/Me

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

system.

SCC-ACC01 Accelerometer Input Module User Guide 4 ni.com

Device Specific Information

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

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

for download at ni.com/manuals.

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-ACC01 into any analog input socket on the

SC-2345. It can function as a single-stage module or as the first stage of

a dual-stage signal conditioning configuration. The socket you choose

determines which E Series DAQ device channels receive the SCC-ACC01

signals, as explained in the Connecting the Input Signalssection.

For single-stage input conditioning, plug the SCC-ACC01 into any socket

J(X+1), where Xis 0 to 7, and connect the input signals to the module as

described in the Connecting the Input Signals section.

If you use the SCC-ACC01 in a dual-stage configuration, the SCC-ACC01

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 Xis 0 to 7. Connect the input

signals to the SCC-ACC01 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-ACC01 followed by a lowpass filter module (SCC-LPXX).

Although not available for the SCC-ACC01, sockets J9 to J16 are available

for digital input/output conditioning or control with another SCC module.

Refer to the SC-2345/2350 User Manual for more information on

configuring, connecting, and installing SCC modules.

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 is labeled by pin number <1..4>. Pins 1 and 2 form a

differential (DIFF) analog input channel for measuring the voltage across

the accelerometer. This channel is routed to E Series DAQ device

channel X, where Xis 0 to 7 depending on the socket where you plug in

the SCC-ACC01. Pins 3 and 4 carry the 4 mA constant-current excitation

source. Figure 1 shows the SCC-ACC01 signal connections.

©National Instruments Corporation 5 SCC-ACC01 Accelerometer Input Module User Guide

Figure 1. SCC-ACC01 Signal Connections

The signal source can be floating or ground-referenced. The SCC-ACC01

input circuitry includes high-impedance bias resistors typically required for

floating sources. External bias resistors connected to ground are not

required.

For floating signal sources in high-noise environments, connect the

negative terminal of the signal source to the AI GND terminal on the

SC-2345 screw-terminal block to reduce common-mode noise.

For information about how to configure the SCC-ACC01 module using

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

Using the SCC-ACC01

Scaling Voltage Measurements

If you configured the SCC-ACC01 using Measurement & Automation

Explorer (MAX) and are using NI-DAQ, the reading you get from the

E Series DAQ device is properly scaled. Use scaling constants obtained

from your sensor data sheet to convert the accelerometer voltage to the

desired unit, such as newtons, m/s2, or g. Otherwise, complete the

following steps to scale the readings:

1. Measure the accelerometer voltage.

a. Read the accelerometer channel on the E Series DAQ device

VESERIES (CHX).

b. Calculate the accelerometer voltage using this formula:

VACC = VESERIES /2

where

VACC is the SCC-ACC01 input voltage.

VESERIES is the E Series DAQ device input voltage.

IEX (4 mA)

E Series

AI (

)

–

SCC-ACC01

ACC AC

Coupling

19 kHz

Lowpass

Filter

SCC-ACC01 Accelerometer Input Module User Guide 6 ni.com

2. If the module is configured using MAX, use scaling constants obtained

from your sensor data sheet to convert VACC voltage to the desired unit,

such as newtons, m/s2, or g.

Note Step 1 provides proper scaling for the amplifier in the SCC-ACC01 if the module is

not configured using MAX.

Specifications

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

Analog Input

Number of input channels.......................1 DIFF

Input range ..............................................±5 V (fixed gain of 2)

Input coupling.........................................AC (highpass 1-pole RC filter)

–3 dB cutoff frequency....................0.8 Hz

Filter type................................................Lowpass 3-pole Bessel

–3 dB cutoff frequency....................19 kHz

Passband flatness ....................................±0.3 dB, 10 Hz–5 kHz;

±1 dB, 5 Hz–10 kHz

Input impedance .....................................0.39 µF in series with 5 MΩ

(powered on or off)

System noise ...........................................130 µVrms

(referred to input, [RTI])1

1 This specification is calculated relative to the input range of the module.

©National Instruments Corporation 7 SCC-ACC01 Accelerometer Input Module User Guide

Transfer Characteristics

Gain........................................................ 2

Gain transfer

Gain (dB)

0.01 0.1 1 10 100 1.1031.1041.1051.106

–100

–80

–60

–40

–20

Frequency (Hz)

SCC-ACC01 Accelerometer Input Module User Guide 8 ni.com

Phase transfer

Gain error................................................±1% of reading

Gain-error temperature coefficient .........±10 ppm/°C

Offset error .............................................±3mVRTI

Offset-error temperature coefficient .......±1.6 µV/°C

Nonlinearity ............................................10 ppm of full scale

Recommended warm-up time.................5 min

Amplifier Characteristics

Common-mode rejection ratio................80 dB at 60 Hz

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

Excitation

Number of channels................................1

Constant-current source..........................4 mA

Phase

(degrees)

Frequency (Hz)

0.01 0.1 1 10 100 1.1031.1041.1051.106

–300

–200

–100

100

©National Instruments Corporation 9 SCC-ACC01 Accelerometer Input Module User Guide

Maximum voltage level

without losing regulation ....................... 24 V

Temperature drift ................................... ±127 ppm/°C

Power Requirement

Analog power......................................... 89 mW max

+15 V .............................................. 3 mA max

–15 V............................................... 3 mA max

Digital power.......................................... 420 mW max

+5 V ................................................ 84 mA max

Physical

Dimensions............................................. 8.89 cm ×2.92 cm ×1.85 cm

(3.50 in. × 1.15 in. ×0.73 in.)

Mass ....................................................... 28.6 g (1.0 oz)

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

male connector,

one 6-pin screw terminal

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

Maximum Working Voltage

Maximum working voltage refers to the signal voltage plus the

common-mode voltage.

Channel-to-earth (inputs) ....................... 42 VDC, 30 Vrms,

Installation Category I

Channel-to-channel (inputs)................... 42 VDC, 30 Vrms,

Installation Category I

Environmental

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

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

Relative humidity................................... 10 to 90%, noncondensing

SCC-ACC01 Accelerometer Input Module User Guide 10 ni.com

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

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

Safety

This product is designed to meet the requirements of the following

standards of safety for electrical equipment for measurement, control,

and laboratory use:

• IEC 61010-1, EN 61010-1

• UL 3111-1, UL 6101B-1

• CAN/CSA C22.2 No. 1010.1

Note For UL and other safety certifications, refer to the product label or visit

ni.com/hardref.nsf, search by model number or product line, and click the

appropriate link in the Certification column.

Electromagnetic Compatibility

Emissions................................................EN 55011 Class A at 10 m

FCC Part 15A above 1 GHz

Immunity ................................................EN 61326:1997 + A2:2001,

Table 1

CE, C-Tick, and FCC Part 15 (Class A) Compliant

Note For EMC compliance, operate this device with shielded cabling.

CE Compliance

This product meets the essential requirements of applicable European

directives, as amended for CE marking, as follows:

Low-Voltage Directive (safety)..............73/23/EEC

Electromagnetic Compatibility

Directive (EMC) .....................................89/336/EEC

Note Refer to the Declaration of Conformity (DoC) for this product for any additional

regulatory compliance information. To obtain the DoC for this product, visit

ni.com/hardref.nsf, search by model number or product line, and click the

appropriate link in the Certification column.

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