CP43维护手册.pdf.pdf - 第158页
Chapter 18 Camera Proper Data Backup Procedure 18 – 6 V ersion 7.0 CP IV -3 Maintenance
18 – 5
Version 7.0
Chapter 18 Camera Proper Data Backup Procedure
18.3Troubleshooting
If camera Proper data does not load successfully from the SRAM memory
card, check for the following possible causes and take the appropriate
corrective measures.
Cause:
The SRAM card was write-protected when camera Proper data was
saved.
Remedy:
Remeasure camera Proper data. Turn off the SRAM card write
protection. Save camera Proper data on the SRAM card.
Cause:
The SRAM card was not inserted correctly when camera Proper data
was saved.
Remedy:
Remeasure camera Proper data. Insert the SRAM card correctly. Save
camera Proper data on the SRAM card.
Cause:
The SRAM card battery is dead.
Remedy:
Remeasure camera Proper data. Replace the SRAM card battery. Save
camera Proper data on the SRAM card.
Cause:
The SRAM card battery was dropped, bent, or otherwise damaged.
Remedy:
Remeasure camera Proper data. Use a new SRAM card. Save camera
Proper data on the SRAM card.
CP IV-3 Maintenance
Chapter 18 Camera Proper Data Backup Procedure
18 – 6
Version 7.0
CP IV-3 Maintenance
19 – 1
Version 7.0
Chapter 19 Video Signal Gain and Offset
19.Video Signal Gain and Offset
Gain and offset are parameters to which the vision system refers when
converting a camera’s analog signal to a digital signal for processing. Gain and
offset must be properly set for the mark and parts cameras to provide usable
images. These settings are made at the factory before the machine is shipped,
and normally the user has no need to change them. However, if image contrast
decreases as the result of damage to a camera, or if the marks on a set of boards
do not contrast well with the background, the user may adjust the gain and
offset as necessary.
19.1Gain
Gain determines the contrast of an image. The smaller the number, the
higher the gain. If the gain is set too high, background noise may increase
to an unacceptable level.
Gain can be set from 0 to 255.
19.2Offset
Offset determines the brightness of an image. The value defines the point
below which signals are ignored. Since noise levels rise as gain increases,
offset must be raised accordingly to exclude noise from the image.
Offset can be set from 0 to 255.
Note: The offset value can be changed if there is difficulty in reading the fiducial
mark or the part, but chances of this type of problem occurring are very
rare. Normally the user should not change the offset value.
CP IV-3 Maintenance