National Instruments NI 6612 User Manual

© National Instruments | 3-7
NI 6612 User Manual
Figure 3-8. Pulse Measurement
Create Channel
To make a Pulse measurement, first create a virtual channel. Use one of following three VIs or
functions depending on the type of data you want DAQmx to return:
• DAQmx Create Channel (CI-Pulse Freq)—For each measurement, return the frequency
and the duty cycle of the signal-to-measure.
• DAQmx Create Channel (CI-Pulse Time)—For each measurement, return the high and
low times of the pulse in seconds.
• DAQmx Create Channel (CI-Pulse Ticks)—For each measurement, return the high and
low times of the pulse in ticks of the counter timebase.
Channel Settings
By default, the counter:
• measures the pulse on a default PFI terminal. Refer to Chapter 5,
Counter Signal Routing
and Clock Generation
, for more information.
• begins measuring on a rising edge. That is, the counter measures the pulse high time first,
then the low time.
You can change these behaviors by configuring the following DAQmx Channel properties:
• The signal-to-measure comes from an input terminal. To change the signal-to-measure,
select the appropriate property from the following list that corresponds to the type of
channel created, and then set this property to a different terminal.
– CI.Pulse.Freq.Term
– CI.Pulse.Time.Term
– CI.Pulse.Ticks.Term
Start Task
Signal to Measure
Counter Timebase
Count
Buffer
10 3 122
DAQmx
Read
3
Read Value
2
Pulse High
Pulse
Low
3
3
2
0001
1
2
DAQmx
Read
1
1
2
1
2
Pulse
High
Pulse
Low

National Instruments NI 6612 Specifications

General

Product Name	National Instruments NI 6612
Category	Computer Hardware
Digital I/O Channels	32
Maximum Counter Frequency	80 MHz
Input Voltage Range	0 V to 5 V
Maximum Output Current	±24 mA
Maximum Clock Rate	80 MHz
Interface	PCI
Operating System Compatibility	Windows
Output Voltage	5 V
Output Current	24 mA
Counter/Timers	4
Digital I/O Logic Levels	TTL
Number of Channels	32

Summary

Important Information

Warranty and Legal

Covers product warranty, copyright, EULAs, and legal notices.

Safety and Product Warnings

Details critical safety warnings and product usage limitations.

Chapter 1 Introduction

Getting Started and Accessories

Guides on installation, accessories, and initial device setup.

Chapter 2 Digital I/O

Digital I/O Operations

Explains input/output methods, timing, and waveform acquisition/generation.

Digital I/O Configuration and Protection

Covers digital filtering, I/O protection, and signal connection.

Chapter 3 Counters

Counter Input Measurements

Details measurement tasks like edge counting, pulse, frequency, and encoders.

Counter Output Generation

Covers pulse and waveform generation using counters.

Chapter 4 PFI

PFI Signal Usage

Explains PFI configuration for timing, digital I/O, and detection.

PFI Filters and Signal Integrity

Discusses PFI filtering, I/O protection, and signal integrity.

Chapter 5 Counter Signal Routing and Clock Generation

Clock Sources and Routing

Describes clock sources, timebases, and signal routing for counters.

Device Synchronization

Explains synchronizing multiple devices using PXIe, PCI, and RTSI.

Chapter 6 Bus Interface

Data Transfer and PXI Express

Details data transfer methods like DMA and PXI Express considerations.

Chapter 7 Calibration

Calibration Information

States that calibration is not required for the NI 6612.

Appendix A Pinout and Signal Descriptions

NI 6612 Pinout Details

Provides detailed pinout information and signal descriptions for the device.

Appendix B Technical Support and Professional Services

NI Support and Services

Lists resources for technical support, training, and professional services.