National Instruments SCC-A10 Manual de usuario

USER GUIDE

SCC-A10 Voltage Attenuator

Module

The SCC-A10 voltage attenuator module accepts up to two voltage sources

of 100 V maximum amplitude and attenuates each voltage by a factor of 10.

A differential instrumentation amplifier buffers each input signal. The

SCC-A10 contains circuitry capable of protecting E Series DAQ devices

for input signals up to 250 Vrms.

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-A10 Voltage Attenuator 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, 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.

What You Need to Get Started

To set up and use the SCC-A10, 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-A10 modules

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

❑SCC Quick Start Guide,available at ni.com

❑SCC-A10 Voltage Attenuator Module User Guide

❑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-head screwdrivers

©National Instruments Corporation 3 SCC-A10 Voltage Attenuator Module User Guide

❑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-A10 when Scaling Voltage Measurements section.

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-A10 into any analog input socket on the SC-2345.

The socket you choose determines which E Series DAQ device channels

receive the SCC-A10 signals, as explained in the SCC Quick Start Guide.

For single-stage input conditioning, plug the SCC-A10 into any socket

J(X+1), where Xis 0 to 7, and connect the input-signal wires to the module

as described in the SCC Quick Start Guide.

If you use the SCC-A10 in a dual-stage configuration, the SCC-A10 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-signal wires to the SCC-A10 as described in the SCC Quick Start

Guide. The SC-2345 connects the output signals of the SCC-A10 to the

inputs of the second-stage SCC. An example of dual-stage conditioning is

an SCC-A10 followed by a lowpass filter module (SCC-LPXX).

Sockets J9 to J16 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-A10 Voltage Attenuator Module 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 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. The value of Xis determined by the number of the

SC-2345 socket where you plug in the module, J(X+1) or J(X+9).

The signal source can be floating or ground-referenced. Floating signal

sources do not require bias resistors to ground with the SCC-A10. Figure 1

shows the SCC-A10 signal connections.

Figure 1. SCC-A10 Signal Connections

For information about how to configure the SCC-A10 module using

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

Signal

Source

AI (X )

AI SENSE

AI (X+8)

SCC-A10

–

E Series DAQ Device

Overvoltage

Protection

Overvoltage

Protection

–

Overvoltage

Protection

Overvoltage

Protection

–

Signal source may be floating or ground-referenced.

2AI GND

©National Instruments Corporation 5 SCC-A10 Voltage Attenuator Module User Guide

Using the SCC-A10 when Scaling Voltage Measurements

If you configured the SCC-A10 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-A10. Otherwise, because the voltage measurement from the E Series

DAQ device is one-tenth of the voltage applied at the SCC-A10 input, you

must multiply the voltage reading from the E Series DAQ device by 10 to

get the correct SCC-A10 input voltage.

Specifications

Note In order for the SCC-A10 to perform according to the specifications in this guide,

the ±15 V power supply you use must be accurate to within 5%.

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

Analog Input

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

Input range ............................................. ±100 VDC

Input impedance ..................................... 1 MΩ(powered on or off)

Gain error ............................................... ±0.14% of reading max1

Gain-error temperature coefficient......... ±0.006% of reading/°C max

Offset error............................................. ±6.5 mV max (referred to

input [RTI]2)

Offset-error temperature coefficient ...... ±80 µV/°C max (RTI)

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

Common-mode rejection ratio ............... 60 dB min (DC to 60 Hz)

1 Temperature range is 23 °C ±5 °C.

2 Calculated with respect to the input range

SCC-A10 Voltage Attenuator Module User Guide 6 ni.com

Dynamic Response

Bandwidth (–3 dB) .................................10 kHz

Output settling time to within

0.01% of nominal input voltage .............15 µs

Output slew rate......................................0.75 V/µs min

Power Requirement

Analog power .........................................100 mW max

+15 V ...............................................3.2 mA max

–15 V ...............................................3.2 mA max

Digital power (+5 V) ..............................0.0 mA

Physical

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

(3.5 in. ×1.15 in. ×0.73 in.)

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

male connector,

one 4-pin screw terminal

Wire gauge range....................................24 to 12 AWG

Maximum Working Voltage

Maximum working voltage refers to the signal voltage plus the

common-mode voltage.

Channel-to-earth .....................................100 V, Installation Category I

Channel-to-channel.................................100 V, Installation Category I

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

©National Instruments Corporation 7 SCC-A10 Voltage Attenuator Module User Guide

Safety

The SCC-A10 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.

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/ECC

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 or product line, and click the appropriate

link in the Certification column.

SCC-A10 Voltage Attenuator Module User Guide 8 ni.com

SCC-A10 Module Pin Assignments

Figure 2 shows the I/O connector pins on the bottom of the module.

Figure 2. SCC Module Bottom View

Table 1 lists the signal corresponding to each pin. AI (X) and AI (X+8) are

the analog input signal channels of the E Series DAQ device. AI GND is

the analog input ground signal and is the reference for AI (X) and AI (X+8).

A GND is the reference for the ±15 V power supply. AI GND and A GND

connect to the SC-2345 at the SCC-PWR connector.

1Pin1 2Pin2 3PWBKey 4 Pin 19 5Pin20

Table 1. SCC-A10 Module Pin Assignments

Pin Number Signal

1E Series AI (X)

2E Series AI GND [AI (X) REF]

3 —

4E Series AI (X+8)

5 —

6E Series AI GND

7 —

8E Series AI GND [AI (X+8) REF]

9 —

10 —

National Instruments™, NI™, ni.com™, and NI-DAQ™ are trademarks of National Instruments

Corporation. Product and company names mentioned herein are trademarks or trade names of their

respective companies. For patents covering National Instruments products, refer to the appropriate

location: Help»Patents in your software, the patents.txt file on your CD, or ni.com/patents.

371067B-01 Mar04

*371067B-01*

11 A GND

12 —

13 +15 V

14 –15 V

15 —

16 —

17 —

18 —

19 —

20 —

Table 1. SCC-A10 Module Pin Assignments (Continued)

Pin Number Signal

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