National Instruments SCC-FV01 Manuale utente

USER GUIDE

SCC-FV01 Frequency Input

Module

The SCC-FV01 frequency input module is a frequency-to-voltage

converter designed to measure signals from frequency-generating sensors

and other periodic signal sources. The DC output voltage of the module is

proportional to the input 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,

P1.<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.

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.

SCC-FV01 Frequency Input Module User Guide 2 ni.com

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-FV01, 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-FV01

❑SCC-FV01 Frequency Input Module 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-head screwdrivers

❑Wire insulation strippers

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

©National Instruments Corporation 3 SCC-FV01 Frequency Input Module User Guide

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

system. Refer to the SCC-FV01 Module Pin Assignments section for more information.

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-FV01 into any analog input socket on the SC-2345.

It can function as a single-stage analog input or as the second stage of a

dual-stage analog input configuration. The socket you choose determines

which E Series DAQ device channels receive the SCC-FV01 signals, as

explained in the Connecting the Input Signals section.

For single-stage input conditioning, plug the SCC-FV01 into any socket

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

as described in theConnectingthe Input Signalssection.

Note If you use the SCC-FV01 in a dual-stage configuration, you must use it as the second

stage. Plug the first-stage module into any socket J(X+9) and plug the SCC-FV01 into

socket J(X+1), where Xis 0 to 7.

Sockets J9 to J16 are also available for digital input/output conditioning

or control. Refer to the SC-2345 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>. The SCC-FV01

has two referenced single-ended (RSE) input channels. Pins 1 and 2

form a channel routed to E Series DAQ device channel X+8, and pins

3 and 4 form a second 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). Both input channels

are referenced to AI GND of the E Series DAQ device.

SCC-FV01 Frequency Input Module User Guide 4 ni.com

Note If your application requires nonreferenced inputs, consider using an SCC-AI Series

module as the first stage in a dual-stage configuration.

For information about how to configure the SCC-FV01 module using

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

Using the SCC-FV01

Scaling Voltage Measurements

If you configured the SCC-FV01 using Measurement & Automation

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

E Series DAQ device is properly scaled. Otherwise, you must scale your

readings by multiplying the measured DC voltage by 10 to get the input

frequency in hertz.

Measuring Frequencies Below 5 Hz

The output ripple of the SCC-FV01 increases as the input frequency

decreases, and it is significant for frequencies below 5 Hz. To overcome the

effect of output ripple, acquire and average at least 100 samples per period

for two periods of the input frequency. This gives you more accurate

measurements of frequencies below 5 Hz with the exception of 0 Hz.

At 0 Hz there is no ripple; therefore, there is no special need to acquire

and average your data.

Calibrating Offset Errors

The SCC-FV01 module is calibrated at the factory before shipment. If you

want to adjust for any errors in your system, you need a function generator

and an oscilloscope capable of measuring the frequency you are applying.

The oscilloscope must be several times more accurate than the SCC-FV01

itself.

To adjust the SCC-FV01 module, complete the following steps:

1. Connect the function generator and oscilloscope to the input of the

specific SCC-FV01 channel you are calibrating.

2. Adjust the function generator to output the maximum frequency and

amplitude you are measuring.

3. Using your software, have the E Series DAQ device read the

SCC-FV01 channel.

4. Adjust the potentiometer on top of the SCC-FV01 module that

corresponds to the channel you are calibrating. Turn the potentiometer

until your software measures the same frequency as that measured by

the oscilloscope at the input.

©National Instruments Corporation 5 SCC-FV01 Frequency Input Module User Guide

Specifications

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

Input Characteristics

Number of input channels ...................... 2 RSE

Input signal amplitude............................ ±200 mV1to ±10 V

(zero crossing)

Input coupling ........................................ DC

Minimum input frequency ..................... 0 Hz

Maximum input frequency..................... 100 Hz

Minimum input pulse width

(5 V pulse train) ..................................... 1.5 µs

Input impedance

Signal ≥threshold (0 V).................. 400 kΩ

Signal <threshold (0 V).................. 10 MΩ

Threshold ............................................... 0 V

Hysteresis ............................................... 200 mV

Transfer Characteristics

Output response time following

a full-scale input change ........................ 80 ms at 63%

220 ms at 90%

360 ms at 99%

Output offset .......................................... 5 mV max

Output offset temperature coefficient .... 10 ppm/°C

Gain error ............................................... ±0.1% max

Gain error temperature coefficient......... 100 ppm/°C

Nonlinearity ........................................... 0.015% full-scale

1 Recommended; minimum ±100 mV.

SCC-FV01 Frequency Input Module User Guide 6 ni.com

Output ripple...........................................30 mVp-p at 10 Hz

(input signal frequency)

Output range ...........................................0 to +10 V (NRSE)

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

Power Requirements

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

+15 V ...............................................4.9 mA

–15 V ...............................................1.75 mA

Digital power ..........................................0 mW

+5 V .................................................0 mA

Operating voltage accuracy requirements

+15 V ...............................................±10%

–15 V ...............................................±10%

REF5V.............................................±0.05%

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

(detachable)

Wire gauge range....................................28 to 16 AWG

Maximum Working Voltage

Maximum working voltage refers to the signal voltage plus the

common-mode voltage.

Channel-to-earth .....................................±10 V, Installation Category I

Channel-to-channel.................................±10 V, Installation Category I

©National Instruments Corporation 7 SCC-FV01 Frequency Input Module User Guide

Environmental

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

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

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

Maximum altitude .................................. 2,000 meters

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

Safety

The SCC-FV01 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 level, 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

SCC-FV01 Frequency Input Module User Guide 8 ni.com

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-FV01 Module Pin Assignments

Figure 1 shows the I/O connector pins on the bottom of the module.

Figure 1. SCC Module Bottom View

Table 1 lists the signal corresponding to each pin.

1Pin1 2Pin2 3PWBKey 4 Pin 19 5Pin20

Table 1. SCC-FV01 Pin Signal Assignments

Pin Number Signal

1E Series AI (X)

2E Series AI GND

3 —

4E Series AI (X+8)

5 —

6E Series AI GND

7 —

8E Series AI GND

©National Instruments Corporation 9 SCC-FV01 Frequency Input Module User Guide

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 supplies and

REF 5 V. AI GND and A GND connect to the SC-2345 at the SCC-PWR

connector. Pins 17 to 20 accept inputs from a first-stage SCC module if you

are cascading two modules.

9 —

10 —

11 A GND

12 REF 5 V

13 +15 V

14 –15 V

15 —

16 —

17 AI (X)–(from first stage)

18 AI (X+8)+(from first stage)

19 AI (X)+(from first stage)

20 AI (X+8)–(from first stage)

Table 1. SCC-FV01 Pin Signal Assignments (Continued)

Pin Number Signal

SCC-FV01 Frequency Input Module User Guide 10 ni.com

Theory of Operation

Figure 2 illustrates the key functional components of the SCC-FV01.

Figure 2. SCC-FV01 Signal Connections

The SCC-FV01 has two input channels designed to measure 0 to 100 Hz

signals. The output voltage (0 to 10 VDC) varies linearly with respect to the

input frequency.

The frequency-to-voltage and analog circuitry for each channel consists of

a triggering stage, a frequency-to-voltage stage, and an output stage.

–

–Comparator

Comparator Frequency-

to-Voltage

3 Hz

Butterworth

Filter

Frequency-

to-Voltage

3 Hz

Butterworth

Filter

AI (

)

AI SENSE

AI GND

AI (

+8)

Signal

Source

Triggering

Stage

F-V

Stage

Output

Stage

Indice

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