Ross 4500DR-104-07, User Manual, Page: 90 / 161

90 • Front Panel Menu System SRG-4500 User Guide (v7.0)
Figure 7.32 Calibration Menu Example
 The Calibration menu contains fundamental settings relating to the functionality and accuracy of the SRG-4500.
These settings are programmed during initial testing, configuration and alignment. Under normal circumstances,
it should not be necessary to adjust any of these settings after the unit has been installed. It is a good idea to make
a manual record of these settings in case they become corrupted or are inadvertently changed. A convenient way
to achieve this is to print this page, record the stored values alongside the respective menu lines, then store the
list in a safe place.
Enable Adjustments
This menu line enables the user to change any of the calibration settings in the remainder of this menu.This menu
option is always set to “No” upon entry - it requires a conscious action on the part of the user to set the option to
“Yes” and thereby enable calibration value adjustments.
The options are:
• No — Calibration is disabled (Default). The user may view the menu values at any time.
• Yes — Calibration is enabled. The user is able to change any of the preset values.
Oven Frequency
This menu line allows the user to adjust the frequency of the internal 10MHz oscillator.
When the SRG-4500 is configured for Internal Lock (refer to the section“
Genlock Menus ” on page 72), the video
outputs on the SRG-4500 will “free run” compared to an external video signal from a known reference.
To set the 10MHz oscillator
1. View both the Composite output and the known reference on a vector scope.
2. On the vector scope, ensure that the known reference is also looped through to the EXT REF input, and that the
EXT REF function is enabled.
3. Adjust the “Oven Frequency” menu value so that the Composite video output signal rotates at less than 1
cycle/second compared to the known reference.
When the SRG-4500 has a GPS receiver installed and enabled, this value is automatically adjusted by the
SRG-4500, using embedded clock data in the GPS signal.
This setting varies from unit to unit.
PAL SCPhase 0000 =
PAL HGenlockPoint 0000 =
PAL OPScH 000 =
PAL IPSCH 000 =
Oven Frequency +00000 =
Enable adjustments No
DC=000
NTSC IPSCH 000 =
NTSC HGenlockPoint 0000 =
NTSC OPScH
000
=
Comp Gain=000
NTSC SCPhase 0000 =
Black1 DC=000 Gain=000
Black2
DC=000
Gain=000
Black4 DC=000 Gain=000
Black3 DC=000 Gain=000
=