National Instruments NI Vision NI 17xx User Manual

Also see for NI Vision NI 17 Series: User manual User manual

Contents

National Instruments NI Vision NI 17xx User Manual Manual pdf 32 page image

Chapter 4 LightingNI 17xx Smart Camera User Manual 4-2 ni.comNote Additional/replacement plugs for use with the lighting connector, part number780260-01, are available from NI.Direct Drive Lighting ControllerThis section applies only to the following NI Smart Cameras:The NI Smart Camera offers an innovative lighting controller that directlypowers third-party current controlled lights. With other smart cameras,a lighting controller that drives a light must be purchased separately.The Direct Drive lighting controller is capable of powering a variety ofthird-party lights.For a current controlled light, higher current produces more light, up to themaximum current rating of the light. The maximum current rating of thelight is specified by the manufacturer and based on the average amount ofpower that can be safely dissipated by the light.The Direct Drive controller can operate in continuous or strobed mode.When operating in strobed mode, the controller can provide more currentto the light than in continuous mode. The average power dissipated whilestrobing the light for a short period of time at a higher current can becomparable to the average power dissipated while running the lightcontinuously at a lower current. Table 4-1 shows the maximum allowedcurrent for continuous mode and strobed mode.For applications with a pause between exposures while new parts move intoposition, you can strobe the light, which allows the use of higher currentand produces more light; thus you can reduce the exposure time. A shorterexposure time decreases the time it takes to acquire an image andpotentially increases the total throughput of the system. Refer to theExposure section of Chapter 5, Image Acquisition, for more informationabout exposure control.• NI 1742 • NI 1762• NI 1744 • NI 1764Table 4-1. Maximum Allowed Current for Direct Drive Lighting ControllerMaximum Strobed Current Maximum Continuous Current1 A 500 mA