Ross ACO-4400A, User Manual, Page: 105 / 112

ACO-4400A User Manual (Iss. 03) Calibration Procedure • 9–3
Calibrating the ACO-4400A
The ACO-4400A 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
• SPG-4400 producing at least 2 outputs of analog Color Black (without VITS, VITC or
any other ancillary signals)
• Several short BNC cables
• Configure the ACO-4400A 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-4400A
1. Navigate to the Calibration Menu.
• Select the channel to be adjusted.
• 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”.
8. Press the rotary control. The Menu reads: “Add 50ohm term”.
9. Add a 50ohm termination onto the T-piece already on the output BNC of the channel
being adjusted.
10. Press the rotary control. The Menu reads: “Take fail values”.
11. Press the rotary control. The Menu shows that the next channel is ready to be calibrated.
12. If you wish to continue, repeat from step 2. for the next channel. Use either the same
T-piece or a second one for applying the terminations.
13. If you do not wish to continue, use the back button to return to the Main Menu.
14. You must exit fully from the Menu system in order to permanently save the new
calibration values.
15. If you had previously recorded the calibration values when you received the unit, the
values stored after this calibration session should correspond quite closely with those
original ones.
Note
— In the event of a procedural error, simply use the back button to return to the start of
the current channel calibration.