Ross 4500DR-204-03, User Manual, Page: 63 / 70

ACO-4500 User Guide (v3.0) Calibration Procedure • 63
Calibration Procedure
The Calibration Menu contains fundamental settings relating to the functionality and accuracy of the ACO-4500.
These settings are programmed during initial testing and through subsequent configuration and alignment. 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 out the table at the end of the System Setup Menu section, and record the
stored values. You can then store this list in a safe place.
Disclaimer
Most of these settings are determined during initial testing and through subsequent configuration and alignment.
They should not normally require re-configuration during service. In some cases, specific test equipment or even
custom apparatus is required to perform calibration and configuration.
On no account should the user attempt to alter any of these settings without proper authorization from Ross Video
Limited.
If problems are encountered, these settings can only be re-instated by performing the detailed Calibration Procedure
that follows.
Contact Ross Video for further instructions.
Calibrating the ACO-4500
The ACO-4500 Calibration Procedure should ideally be performed on a test bench. Easy access to the rear panel
BNCs is required.
The following specific equipment is required to perform this procedure:
• At least 2 x 75ohm BNC terminations (certified)
• At least 2 x 50ohm BNC terminations (certified)
• At least 2 x 75ohm BNC T-piece adapters
• SRG-4500 producing at least 2 outputs of analog Color Black (without VITS, VITC or any other ancillary
signals)
• Several short BNC cables
• Configure the ACO-4500 for Operating Mode = “Manual”, and Output = “Primary”

Familiarity with menu navigation will be assumed - specific menu selection instructions may be shortened for
clarity.
To calibrate the ACO-4500
1. Navigate to the Calibration Menu.
a. Select the channel to be adjusted.
b. Select “Do Calibration” = “Yes”.
2. Verify that the Menu reads: “Terminate the output”.
3. Connect a T-piece with a 75ohm termination onto the output BNC of the channel to be adjusted.
4. Press the rotary control. The Menu reads: “
Taking no signal val
.”.
5. Press the rotary control. The Menu reads: “
Apply signals
”.
6. Connect 2 x Color Black to the Primary and Backup inputs of the channel being adjusted.
7. Press the rotary control. The Menu reads: “
Taking signal values
”.