National Instruments SCC-LP Series User manual

USER GUIDE

SCC-LP Series Lowpass Filter

Modules

The SCC-LP Series lowpass filter modules contain fourth-order

Butterworth filter circuitry. They accept two differential input signals

within a ±10 V range. A differential amplifier attenuates each signal by

a factor of two. The output of the amplifier passes through a fourth-order

Butterworth filter circuit.

The SCC-LP Series consists of the following modules:

• SCC-LP01—25 Hz cutoff frequency

• SCC-LP02—50 Hz cutoff frequency

• SCC-LP03—150 Hz cutoff frequency

• SCC-LP04—1 kHz cutoff frequency

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.

SCC-LP Series Lowpass Filter Modules User Guide 2 ni.com

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 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, 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.

SCC-LPXX SCC-LPXX refers to any SCC-LP Series lowpass filter signal conditioning

module.

©National Instruments Corporation 3 SCC-LP Series Lowpass Filter Modules User Guide

What You Need to Get Started

To set up and use the SCC-LPXX, 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-LPXX

❑SCC-LP Series Lowpass Filter Modules User Guide

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

❑SCC Quick Start Guide, available at ni.com

❑Read Me First: Safety and Radio-Frequency Interference

❑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. Refer to the Using the SCC-LPXX when Scaling Voltage Measurements section for

more information.

SCC-LP Series Lowpass Filter Modules 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-LPXX into any analog input socket on the SC-2345.

It can function as a single-stage module or as the first or the second stage

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

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

output signals, as explained in the Connecting the Input Signals section.

For single-stage conditioning, plug the SCC-LPXX 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.

The SCC-LPXX can function as either the first or the second stage of a

dual-stage configuration. Plug the first-stage SCC 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 first-stage SCC. 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-A10 voltage attenuator

module followed by an SCC-LPXX.

Sockets J9 to J16 also are available for digital input/output (DIO)

conditioning or control. Refer to the SC-2345 User Manual and SCC Quick

Start Guide 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 channel routed to E Series DAQ device channel X+8, and

pins 3 and 4 form a second differential channel routed to E Series DAQ

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

in the SCC-LPXX.

©National Instruments Corporation 5 SCC-LP Series Lowpass Filter Modules User Guide

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

input circuitry includes high-impedance bias resistors typically required for

floating sources. Therefore, floating signal sources do not require external

bias resistors connected to ground.

Note 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.

Figure 1. SCC-LPXX Signal Connections

For information about configuring the SCC-LPXX module using

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

AI (X )

AI (X+8)

SCC-LP

–

E Series DAQ Device

–

Signal source may be floating or ground-referenced.

10 MΩ

AI SENSE

2AI GND

Fourth-Order

Butterworth

Lowpass

Filter

1 kΩ

Fourth-Order

Butterworth

Lowpass

Filter

Signal

Sources

SCC-LP Series Lowpass Filter Modules User Guide 6 ni.com

Using the SCC-LPXX when Scaling Voltage Measurements

If you configured the SCC-LPXX using Measurement & Automation

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

from the E Series DAQ device accounts for the voltage scaling effect of the

SCC-LPXX. Otherwise, you must scale the readings as follows:

1. Read the SCC-LPXX channel on the E Series DAQ device

VESERIES (CHX).

2. Calculate the SCC-LPXX voltage using this formula:

VLP = 2VESERIES

where

VLP is the SCC-LPXX input voltage.

VESERIES is the E Series DAQ device input voltage.

Specifications

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

Amplifier Characteristics

Number of input channels.......................2 DIFF

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

Output signal range.................................±5 V

Gain ........................................................0.5

Input impedance .....................................10 GΩin parallel with 10 pF

(powered on)

10 kΩ

(powered off or overloaded)

Gain error................................................Adjustable to 0% of reading

Offset-voltage error ................................350 µV typ

(referred to input, RTI)1

1.5 mV max2

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

2 Applicable at 25 °C.

©National Instruments Corporation 7 SCC-LP Series Lowpass Filter Modules User Guide

Input bias current ................................... ±2 nA typ

±5 nA max1

Nonlinearity ........................................... 0.004% of full scale

Filter Characteristics

Filter type ............................................... Fourth-order Butterworth

lowpass

Rolloff rate ............................................. 80 dB/decade

–3 dB cutoff frequency (fc)

SCC-LP01....................................... 25 Hz

SCC-LP02....................................... 50 Hz

SCC-LP03....................................... 150 Hz

SCC-LP04....................................... 1 kHz

Passband ripple

System Noise

Total harmonic distortion (THD) at fc... < –90 dB

Wide-band noise

(DC to 1 MHz, RTI)............................... 100 µVrms

Narrow-band noise

(DC to 33 kHz, RTI) .............................. 6 µVrms

1 Applicable at 25 °C.

Input Signal Typical Maximum

DC to 1/3 fc ±0.04 dB 0 ±0.1 dB

DC to 1/2 fc ±0.06 dB 0 ±0.2 dB

DC to 2/3 fc –0.2 ±0.25 dB –0.2 ±0.4 dB

DC to fc –3 ±0.3 dB –3 ±0.5 dB

SCC-LP Series Lowpass Filter Modules User Guide 8 ni.com

Stability

Gain temperature coefficient ..................10 ppm/°C typ

20 ppm/°C max

Offset-voltage

temperature coefficient ...........................3.4 µV/°C typ (RTI)

27 µV/°C max

Power Requirement

Analog power

SCC-LP01, SCC-LP02....................135 mW max

+15 V........................................4.5 mA max

–15 V ........................................4.5 mA max

SCC-LP03, SCC-LP04....................475 mW max

+15 V........................................15.8 mA max

–15 V........................................15.8 mA max

Digital power ..........................................0.0 mW max

Physical

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

(3.50 in. ×1.15 in. ×0.73 in.)

Mass........................................................37 g (1.3 oz)

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

male connector,

one 4-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)........................±15 V, Installation Category I

Channel-to-channel (inputs) ...................±15 V, Installation Category I

Environmental

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

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

©National Instruments Corporation 9 SCC-LP Series Lowpass Filter Modules User Guide

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

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

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

Safety

The SCC-LPXX meets the requirements of the following standards

for safety and electrical equipment for measurement, control, and

laboratory use:

• IEC 61010-1, EN 61010-1

• UL 3111-1, UL 61010B-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 full EMC compliance, operate this device with shielded cabling. In addition,

all covers and filler panels must be installed.

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.

SCC-LP Series Lowpass Filter Modules User Guide 10 ni.com

Theory of Operation

SCC-LPXX Performance

The SCC-LPXX uses a Butterworth filter, which is characterized by

maximal flatness in the passband with very sharp monotonic rolloff. It has

a nonlinear phase response, the delay is not constant, and the step response

exhibits a moderate amount of overshoot (ringing). These characteristics

present no problems in applications where only the amplitude of signal

frequency components is of interest.

The Butterworth filter is a good general-purpose filter. Figures 2 through 5

show the typical gain response curve for each SCC-LPXX.

Figure 2. Typical SCC-LP01 Response Curve

Frequency (Hz)

Amplitude (dB)

– 25.0

1234510202550

– 20.0

– 15.0

– 10.0

– 5.0

0.0

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