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National Instruments NI 17xx Determining the Trigger Delay, Calculating the Minimum Frame Period

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Chapter 5 Image Acquisition

When strobing is enabled, the smart camera waits until the image readout

is complete before turning on the light for the next frame, as shown in

Figure 5-4.

Figure 5-4. Image Acquisition With Strobing

Determining the Trigger Delay

If the trigger delay is set longer than the untriggered minimum frame

period, the trigger delay value further limits the min frame period. When

the trigger delay is specified in milliseconds, the software includes this in

the calculation of the maximum frame rate indicator.

Calculating the Minimum Frame Period

Refer to Equations5-3 and 5-4 to calculate the minimum frame period for

untriggered acquisitions with and without strobing.

(5-3)

(5-4)

1 Image Readout Completes Before Lighting Strobe Asserts for Next Image

Trigger

Lighting Strobe

Exposure

Image Readout

min frame periodNoStrobeNoTrigger TLE++=

min frame periodWithStrobeNoTrigger TLER+++=

Contents

Main Page Important Information Warranty Copyright Trademarks Patents Compliance Compliance with FCC/Canada Radio Frequency Interference Regulations Determining FCC Class FCC/DOC Warnings Class A Contents Chapter 4 Lighting Chapter 5 Image Acquisition Chapter 6 LEDs and DIP Switches Page About This Manual Conventions Related Documentation Hardware Documents NI Vision Builder for Automated Inspection Documents LabVIEW and NI Vision Development Module Documents NI Vision Acquisition Software Documents NI Smart Camera Overview Hardware Overview Page Figure 1-1 shows the smart camera. Figure 1-1. NI Smart Camera Software Overview NI Vision Builder for Automated Inspection LabVIEW LabVIEW Real-Time Module NI Vision Development Module NI Vision Acquisition Software Power and I/O POWER-I/O Connector NI Smart Camera Power Requirements Isolated Inputs Isolated Outputs The isolated outputs can be used to drive external loads, as shown in Figures 2-3 and 2-4. Figure 2-3. Connecting an Isolated Output to a Sourcing External Load Figure 2-4. Connecting an Isolated Output to a Sinking External Load Protecting Against Inductive Loads Connecting to Serial Devices Communicating with the Console Connecting to a Quadrature Encoder Figure2 -5 shows an example of connecting the quadrature encoder differential line drivers. Figure 2-5. Connecting Differential Line Drivers Figure 2-6. NI Smart Camera Quadrature Encoder Input Circuit Figure 2-6 shows the internal quadrature encoder/RS-422 input circuit. NI Smart Camera Image Sensor Field of View Page Image Sensor Spectral Response Partial Scan Mode Binning Gain Hardware Binarization Page Lighting Lighting Connector Direct Drive Lighting Controller Page Lighting Files Selecting a Light Connecting a Light to the Direct Drive Lighting Controller External Lighting Controllers Connecting an External Lighting Controller to the NI Smart Camera Page Image Acquisition Exposure Acquiring Images Internal Timing External Trigger Page Page Maximum Frame Rate Determining the Maximum Frame Rate Determining the Scan Mode Determining the Exposure Time Determining the Lighting Mode Determining the Trigger Delay Calculating the Minimum Frame Period Page LEDs and DIP Switches Understanding the LED Indicators Device Initialization POWER LED STATUS LED Page IMG ACQ LED PASS LED FAIL LE D Configuring DIP Switches SAFE MODE Switch IP RESET Switch NO APP Switch CONSOLE Switch Ethernet Ports Ethernet LEDs ACTIVITY/LINK LED SPEED LED DHCP and Static IP Address Assignment Firewall Considerations Subnet Considerations Thermal Considerations and Mounting Thermal Considerations Mounting the NI Smart Camera Figure 8-2. Back View of the NI Smart Camera with Dimensions Figure 8-3. Front View of the NI Smart Camera with Dimensions Figure 8-4. Side View of the NI Smart Camera with Dimensions Figure 8-5. Bottom View of the NI Smart Camera with Dimensions A Specifications Power Requirements Memory Processor VGA Sensor (NI 1722/1742/1762 Only) SXGA Sensor (NI 1744/1764 Only) Page Lighting Network Serial Optically Isolated Inputs and Outputs Isolated Inputs Isolated Outputs Quadrature Encoder (NI 1742/1744/1762/1764 Only) Physical Characteristics Environmental Safety Electromagnetic Compatibility CE Compliance Environmental Management Waste Electrical and Electronic Equipment (WEEE) RoHS B Troubleshooting Configuration Problems The NI Smart Camera Does Not Appear in MAX or Vision Builder AI The NI Smart Camera Restarts Unexpectedly Run-Time Problems The NI Smart Camera is Unresponsive and Blinks the IMG ACQ and FAIL LED s Lighting Problems The Light Does Not Illuminate When Using the Direct Drive Controller There is No External Lighting Strobe MAX Vision Builder AI Triggering Problems No Trigger is Received LED Error Indications STATUS LED Error Conditions POWER LED is Not Lit When the NI Smart Camera is Powered On C Maintenance D Technical Support and Professional Services Page Glossary B C D E Page Page Page Index Numerics A B C G H I K L P Q R S T U V W