USER’S MANUAL SUPPLEMENT Document Number: DA00073602 Release Date: 4 April 2006
For customers in the U.S.A. This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications.
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DRAFT Contents Table of Contents 1 Purpose of This Document . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2 Gain Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2.1 Larger Gain Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2.2 Left Side Gain and Right Side Gain Binary Commands . . . . . . . . . . . . . . . . . . . . . . .
Contents II DRAFT Basler A202k High Gain
DRAFT 1 Supplement Purpose of This Document The Basler A202k High Gain camera is a variant of the standard Basler A202k camera. The purpose of this document is to describe the unique aspects of A202k High Gain cameras. The unique aspects of A202k High Gain camera are listed below. • As the name implies, A202k High Gain cameras have a higher available gain range than standard A202k cameras. The gain range and the gain related binary commands for high gain cameras are detailed in Section 3.
Supplement 2 DRAFT Document Applicability This user’s manual supplement applies to A202k High Gain cameras with a camera version ID number of 02. High gain cameras with a lower or a higher ID number may have fewer features or have more features than described in this supplement. Features on cameras with a lower or a higher ID number may not operate exactly as described in this supplement. An easy way to see the camera version ID number for an A202k High Gain camera is by using the CCT+.
DRAFT 3 Supplement Gain Changes 3.1 Larger Gain Range The major difference between the standard camera and the high gain version is the gain range. On standard cameras, the gain can be programmed on a decimal scale that ranges from 288 to 569 (0x0120 to 0x0239). At the highest gain setting on a standard camera, the gain will be 12 dB. On the high gain version, gain can be programmed on a decimal scale that ranges from 288 to 1023 (0x0120 to 0x03FF).
DRAFT Supplement 3.2 Left Side Gain and Right Side Gain Binary Commands On high gain cameras, the data range for the left side gain and the right side gain binary commands is larger than on standard cameras. The larger range is shown in the tables below. Left Side Gain Purpose: To set the gain for the left side of the CCD array or to read the current left side gain setting. Type: This is a read or write command.
DRAFT 4 Supplement Digital Shift Changes 4.1 Additional Digital Shift Setting Available On standard cameras, the digital shift feature has “shift once” and “shift twice” settings available. On high gain cameras, a “shift three times” setting has been added. The description of the digital shift feature that appears below includes the additional setting. Digital Shift On High Gain Cameras The “digital shift” feature lets you change the group of bits that is output from each ADC.
DRAFT Supplement L Note that if bit 9 is set to 1, all of the other bits will automatically be set to 1. This means that you should only use the shift once setting when your pixel readings in 10 bit mode with no digital shift are all below 512. Since the shift once setting requires that the least significant bit always be "0", no odd gray values can be output. In this case, the gray value scale will only include gray values of 2, 4, 6 and so forth.
DRAFT L Supplement Note that if bit 9, bit 8 or bit 7 is set to 1, all of the other bits will automatically be set to 1. This means that you should only use the shift three times setting when your pixel readings in 10 bit mode with no digital shift are all below 128. Since the shift three times setting requires that the three least significant bits always be "0", the gray value scale will only include every 8th gray value. For example, 8, 16, 24 and so forth. 4.1.
DRAFT Supplement Shift Twice When the camera is set to shift twice, the output from the camera will include bit 7 through bit 0 from each ADC. The result of shifting twice is that the output of the camera is effectively multiplied by four. For example, assume that the camera is set for no shift, that it is viewing a uniform white target, and that under these conditions the reading for the brightest pixel is 20. If you changed the digital shift setting to shift twice, the reading would increase to 80.
DRAFT Supplement 4.1.3 Precautions When Using Digital Shift There are several checks and precautions that you must follow before using the digital shift feature on high gain cameras. The checks and precautions differ depending on whether you will be using the camera in 10 bit output mode or in 8 bit output mode. If you will be using the camera in 10 bit output mode, make this check: 1.
DRAFT Supplement 4.2 Digital Shift Binary Command On high gain cameras, a “shift three times” setting has been added to the data formats for the digital shift binary command. The additional setting is shown in the table below. Purpose: To enable or disable digital shift. Type: This is a read or write command.
DRAFT 5 Supplement Pixel Clock, Timing Chart, and Frame Rate Formula Changes A202k High Gain cameras use a 36 MHz pixel clock rather than the 40 MHz clock used on standard cameras. This means that the pixel timings and the formulas for calculating the maximum allowed frame rate are different on high gain cameras. Figure 2 shows the pixel timing chart when a high gain camera is operating with level controlled exposure.
12 [3] [2] [1] Figure 2: Dual 10 Bit or Dual 8 Bit Output Mode with Level Controlled Exposure TIMING CHARTS ARE NOT DRAWN TO SCALE The diagram assumes that the area of interest (AOI) feature is not being used. With the AOI feature enabled, the number of lines transferred and the number of pixels in each line could be smaller. In the level controlled exposure mode, the fall of ExSync starts exposure.
Basler A202k High Gain [3] [2] [1] Figure 3: Dual 10 Bit or Dual 8 Bit Output Mode with Programmable Exposure TIMING CHARTS ARE NOT DRAWN TO SCALE The diagram assumes that the area of interest (AOI) feature is not being used. With the AOI feature enabled, the number of lines transferred and the number of pixels in each line could be smaller. In the programmable exposure mode, the rise of ExSync starts exposure.
DRAFT Supplement 5.1 Calculating the Maximum Allowed Frame Rate Based on the AOI Size When the area of interest feature is used, the camera’s maximum allowed frame rate increases. The amount that the maximum frame rate increases depends on the number of lines included in the area of interest. The smaller the number of lines in the area of interest, the higher the maximum frame rate.
DRAFT 6 Supplement Timer 1 and Timer 2 Binary Commands The Timer 1 and Timer 2 parameters are used to set several aspects of exposure timing on A202k cameras. On A202k High Gain cameras, the usage of the binary commands for setting Timer 1 and Timer 2 has changed. On standard A202k cameras, when you use the Timer 1 binary command to set the value of Timer 1, the setting represents a value in microseconds. For example, if Timer 1 is set to a value of 10, this represents 10 µs.
DRAFT Supplement 6.2 Timer 2 Binary Command Purpose: To set Timer 2 or to read the current Timer 2 setting. Timer 2 is used when the camera is operating in free-run mode. See Section 3.2 for details. Type: This is a read or write command.
DRAFT 7 Supplement Exposure Control Recommendation Changes The User’s Manual for standard A202k cameras contains a set of “Recommendations for Controlling Exposure in ExSync Programmable Mode” and a set of “Recommendations for Controlling Exposure in Free-run Programmable Mode”. The recommendations for A202k High Gain cameras are different from standard cameras. The recommendations for high gain cameras are listed below.
Supplement 18 DRAFT Basler A202k High Gain
DRAFT Revision History Revision History Doc. ID Number Date Changes DA00073601 2 March 2005 Initial release of this document. DA00073602 4 April 2006 Revised the entire document to reflect the changes made for the 36 MHz version of the high gain camera.
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