
802BT/802R Video Test Generator User Guide
45
Restoring factory settings
This section describes how to set and restore the generator system parameters.
System Parameters
The following system parameters are stored in the 802’s non-volatile system memory:
•
The reference rate calibration factor. The 802 uses a crystal controlled oscillator as the
reference for all timing signals. The crystal frequency has a maximum error of ±50 ppm.
The 802 hardware and firmware is capable of compensating for this small amount of
error by applying a user set calibration factor. The factory default setting is 1.000 for the
calibration factor. Use the
RATC
command to set the pixel calibration factors.
•
The maximum pixel clock rate used for error checking formats. All 802 generators will
operate, to some extent, at pixel rates beyond their spec sheet limits. The maximum
rate can be set to a higher limit if it is known that a particular unit will work reliably at
the higher limit. Use the
JRAT
command to set the maximum pixel rate used for error
checking of analog formats.
•
The gamma correction flag. This flag determines whether individual formats can control
the application of gamma correction or if gamma correction is disabled regardless of a
format’s setting. The factory default setting is to allow gamma correction to be
controlled by individual formats. Use the
GAMC
command to enable or disable the
gamma correction flag.
Setting and restoring system parameters
There are two ways of changing the settings of these parameters:
•
They can be restored to their default factory settings as part of a user initiated system
reset. This will also restore the entire format storage memory to its factory default
contents.
•
A suitably equipped computer or terminal connected to one of the communications
ports can be used to set the parameters to user defined settings.
When the generator is reinitialized, each format in the standard library is tested
(one-at-a-time), to determine if the format parameters are fully supported by the generator.
This algorithm is necessary because the standard format library is used across all
generators. If there are some limitation the generator applies a format justification
algorithm. In these cases the generator stores a modified version of the format under a
similar name. If the format is beyond what can be corrected the format is left out of the
generator’s list of formats.
WARNING: The initializing the generator permanently and irreversibly removes all
user-created formats, custom images, test sequences and directories from memory.
Содержание 802BT
Страница 1: ...802BT 802R Video Test Generator User Guide ...
Страница 52: ...42 Chapter 2 Testing Video Displays ...
Страница 62: ...52 Chapter 3 Administrative Tasks ...
Страница 87: ...802BT 802R Video Test Generator User Guide 77 IMGE end an editing session IMGA MyImage save image as MyImage ...
Страница 118: ...108 Chapter 7 Using GPIB Interface ...
Страница 194: ...184 Chapter 10 Testing EDID ...
Страница 204: ...194 Chapter 11 Testing HDCP ...
Страница 213: ...Video Test Generator User Guide 203 A Command Reference Topics in this appendix Commands by name ...
Страница 214: ...204 Appendix A Command Reference Commands by name ...
Страница 303: ...Video Test Generator User Guide 293 Example 7 Turn audio off DPTG 3 DPGU Example 8 Turn audio on DPTG 7 DPGU ...
Страница 595: ...Video Test Generator User Guide 585 ...
Страница 608: ...598 Appendix A Command Reference Related commands YMDO UNPK PKUP VTOF FLSH Example YMDI YMODEM BATCH upload ...
Страница 611: ...Video Test Generator User Guide 601 ...
Страница 612: ...602 Appendix A Command Reference ...
Страница 613: ...802BT 802R Video Test Generator User Guide 603 B Image Reference Topics in this appendix Standard image descriptions ...
Страница 716: ...706 Appendix B Image Reference ...
Страница 744: ...734 Appendix C Error Messages ...