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SCXI Accelerometer

Input Modules

SCXI-1530, SCXI-1531

4 channels (SCXI-1530)

8 channels (SCXI-1531)

Programmatic input range of ±10, ±1,

or ±0.1 V per channel

4 mA current source, 24 V compliance

Programmatic lowpass ﬁlter per

channel (4-pole Bessel) with settings

of 2.5, 5, 10, and 20 kHz

Simultaneous sample-and-hold (S/H)

Autocalibration

BNC connectivity

Driver Software

NI-DAQ

Windows 2000/NT/Me/9x

Application Software

LabVIEW

Measurement Studio

Lookout

Calibration Certiﬁcate Included

filters provide a sharp cutoff while

maintaining interchannel phase

information. Each channel also has a 0.2 Hz

highpass ﬁlter to block the DC offset of ICP-

based sensors. All analog inputs offer T/H

circuitry to perform simultaneous sampling.

Signal Compatibility

EXPRESS

CODES

Module

ICP-Compatible

ICP-Compatible

±0.1 to ±10 V

Accelerometers

Microphones

SCXI-1530

For information or to

buy products online,

visit ni.com/catalog

and enter:

SCXI-1531

Table 1. SCXI Module Compatibility

Overview

National Instruments SCXI-1530/1531 modules are Integrated Circuit

Piezoelectric (ICP) compatible signal conditioning modules designed for

accelerometers and microphones. These modules share a common

architecture in which each input channel includes a programmable AC

instrumentation ampliﬁer, 4-pole Bessel lowpass ﬁlter, and excitation

current source. These modules also offer simultaneous sampling to

preserve interchannel phase relationships. Each module can multiplex

its signals into a single channel of the DAQ device and you can add

modules to increase channel count. With random scanning capabilities,

you select only the channels from which you want to acquire data.

These modules also offer parallel-mode operation for faster scanning

rates. Each module offers BNC connectors to simplify signal connection.

Conditioning

Each channel of the SCXI-1530/1531 has a

4 mA, 24 V compliant current source.

This current source powers ICP-compatible

accelerometer/microphones. By using an

active current source, the excitation current of the module remains

constant regardless of loading by the sensor. You can programmatically

disable the current source for each channel. This is helpful for measuring

the system noise of your environment, or using selected input channels

for other input signal types.

scxi1530

scxi1531

Modes of Operation

Multiplexer

You can program the SCXI-1530/1531 modules to multiplex all

conditioned signals onto channel MCH0 of the rear signal connector

to which you can connect a single input channel of the DAQ device.

Furthermore, you can connect the multiplexed output of each

module using programmable switches to analog bus 0 of the SCXIbus

and to other modules. Several SCXI modules can operate in this

manner with a single DAQ device.

Analog Input

To simplify configuration and ensure measurement accuracy, the

analog inputs of the SCXI-1530/1531 consist of programmable

instrumentation ampliﬁers, 4-pole Bessel lowpass ﬁlters, and track-and-

hold (T/H) circuitry. You can program each channel individually for

input ranges of ±10, ±1, or ±0.1V. You can program the lowpass ﬁlter

of each channel for 2.5, 5, 10, or 20 kHz. The 4-pole Bessel lowpass

National Instruments

Tel: (512) 794-0100 • Fax: (512) 683-9300 • info@ni.com • ni.com

495

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SCXI Accelerometer

Input Modules

SCXI-1530: channels 0-3

SCXI-1531: channels 0-7

CH0+

+

LabVIEW Sound and

Vibration Toolset

For advanced analysis

capabilities and automated

system (end to end)

calibration, consider using

the LabVIEW Sound and

Vibration toolset. For more

information, please visit

ni.com/info and enter

lvsound .

Instrument

Amp

Lowpass

Filter

Sample/Hold

Buffer

CH0–

–

Gain Control

Switch

Current

Source

CH7+

+

Lowpass

Filter

Instrument

Amp

Sample/Hold

CH7–

–

SCXIbus

Interface

Current

Source

Digital

Control

Gain Control

Gain

Register

Calibration EEPROM

Figure 1. SCXI-1530/1531 Block Diagram

Each module also has internal counters for the high-speed

automatic scanning mode when used with any E Series device. A scan

clock signal from the DAQ device synchronizes the scanning.

To determine the allowable scanning rate, total the following – the SCXI-

1530/1531 acquisition time (7 µs) plus its hold mode settling time (1µs)

and the allowable SCXI system scan interval (3 µs with a PCI-MIO-16E-1)

multiplied by the number of channels minus one. For example, you can

scan the 16 channels of two SCXI-1531 modules with the PCI-MIO-16E-

1 in 7 µs + 1µs + 3 µs (16-1) = 53 µs; or a rate of 18.87 kHz.

transparently uses the calibration constants to correct for gain and

offset errors of each channel.

Signal Connection

The SCXI-1530/1531 modules have BNC connectors located directly

on the module; therefore, these modules do not require additional

terminal blocks for signal connection.

See page 470 to conﬁgure your complete SCXI system.

Parallel

The SCXI-1530/1531 modules offer parallel-mode operation to

increase scanning speeds. In parallel mode, you can pass each

conditioned channel directly to the analog inputs of a DAQ device.

This configuration requires a dedicated DAQ device and cable for

each module operating in parallel mode.

Ordering Information

SCXI-1530 ..........................................................777966-30

SCXI-1531 ..........................................................777966-31

Calibration

The SCXI-1530/1531 modules offer simple yet powerful calibration

capabilities. Each module includes a precision onboard calibration

source that you can programmatically route to any analog input. By

using simple software commands, you can perform calibrations to

compensate for environmental changes without connecting external

hardware. Each module has an onboard calibration EEPROM that

stores the calibration constants for each channel. Factory calibration

constants are stored in a protected area of the EEPROM. Additional

user-modiﬁable locations mean calibration can occur under your exact

operating conditions. National Instruments driver software

Extended Warranty

and Value Added Services .......................... page 880

496

National Instruments

Tel: (512) 794-0100 • Fax: (512) 683-9300 • info@ni.com • ni.com

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SCXI Accelerometer

Input Modules

Speciﬁcations

These speciﬁcations are typical at 25 °C unless otherwise noted.

Input Accuracy

Absolute Accuracy (15 to 35 °C) Temperature Drift

% of Reading System Noise (peak, 3 sigma) ( Added drift outside the range 15 to 35 °C)

Module Range Typical Max Offset Single Pt. 100 Pt. Avg Gain Drift Offset Drift

SCXI-1530 ±10 V 0.03% 0.5% ±30 mV 125 µV 25 µV ±10 ppm/°C ±20 µV/°C

±1 V 0.03% 0.5% ±3 mV 125 µV 25 µV ±10 ppm/°C ±20 µV/°C

±100 mV 0.03% 0.5% ±300 µV 125 µV 25 µV ±10 ppm/°C ±20 µV/°C

SCXI-1531 ±10 V 0.03% 0.5% ±30 mV 125 µV 25 µV ±10 ppm/°C ±20 µV/°C

±1 V 0.03% 0.5% ±3 mV 125 µV 25 µV ±10 ppm/°C ±20 µV/°C

±100 mV 0.03% 0.5% ±300 µV 125 µV 25 µV ±10 ppm/°C ±20 µV/°C

One year speciﬁcations. Includes error added by 16-bit E Series MIO immediately after an E Series internal calibration. Absolute accuracy is (reading) * (% of reading) + (offset) + (system noise). If module

temperature is beyond the range 15 to 35 °C, include the added term [(reading) * (gain drift) + offset drift] * ∆ T, where ∆ T is the absolute temperature difference between the module and 15 or 35 °C,

whichever is smaller.

Conditioning

Accelerometer input

excitation current .......................................

Inputs

Number of channels

SCXI-1530..................................................

4 mA ±10%, 24 V compliant

4

Current source drift ........................................

-2.5 µA/°C max

SCXI-1531..................................................

8

Current source dynamic impedance ..............

400 k

min

Ampliﬁer input impedance.............................

1 M Ω

Current source noise, 0.1 to 10 kHz...............

22 µA rms , 80 µA pp max

Ampliﬁer coupling..........................................

AC

Common-mode rejection ratio .......................

75 dB min, 90 dB typ

Simultaneous S/H

Acquisition time .............................................

Common-mode voltage range ......................

42 V operational

7 µs max

Output

Maximum output voltage ..............................

Hold mode settling time ................................

1 µs max

Hold step.......................................................

5 mV typ

±10 V

Droop rate.....................................................

30 mV/s max

Output impedance ........................................

<1 Ω

Interchannel skew..........................................

100 ns max

Ampliﬁer input noise, RTI................................

25 µV rms 125 V pp max

Physical

Dimensions....................................................

Transfer Characteristics

Voltage gain

Gain = 1....................................................

3.0 by 17.3 by 24.4 cm

(1.2 by 6.8 by 8.0 in.)

0 dB

Front connectors ...........................................

BNC (female)

Gain = 10..................................................

20 dB

Rear connectors.............................................

50-pin male ribbon

96-pin female SCXIbus

Gain = 100................................................

40 dB

Gain drift ...................................................

±10 ppm/°C max

Environment

Operating temperature..................................

Accuracy........................................................

±0.5% before calibration

0.03% after calibration

0 to 50 °C

Storage temperature......................................

-55 to 150 °C

Nonlinearity ...................................................

0.004% of FSR max

Relative humidity ...........................................

5 to 90% noncondensing

DC offset........................................................

±30 mV max

DC offset drift.................................................

±20 µV/°C max

Power Requirements

5 V supply ....................................................

Filter type.......................................................

4-pole Bessel lowpass

2-pole 0.2 Hz RC highpass

15 mA max ±15 V supply (regulated from

±24 V supply) 150 mA

Bandwidth.....................................................

2.5, 5, 10, 20 kHz

Certiﬁcation and Compliance

European Compliance

EMC ..........................................................

EN 61326 Group I Class A, 10m, Table 1

Immunity

Safety ........................................................

EN 61010-1

North American Compliance

EMC ..........................................................

FCC Part 15 Class A using CISPR

Australia & New Zealand Compliance

EMC ..........................................................

AS/NZS 2064.1/2 (CISPR-11)

National Instruments

Tel: (512) 794-0100 • Fax: (512) 683-9300 • info@ni.com • ni.com

497

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