Dolby Laboratories 737 - Manual (Page 13)

Model 737 Soundtrack Loudness Meter - Leq(m) Operation and Features
2-6
2.3.2 Connecting to a Dolby Cinema Processor
The method for connecting a Dolby cinema processor with the Model 737 depends on
the application. For a cinema processor used in a studio or dubbing stage, the matrix-
encoded Lt and Rt signals are found on the Cat. No. 150E card. If the connection for
measurement is occasional, use the red and green test points, respectively. For more
permanent installations, connect to pins L and J on the rear panel of the cinema processor.
For a cinema processor used in a theatre, the Lt and Rt signals are found on the red and
green test points (ground is black), respectively, on the Cat. No. 150E or Cat. No. 150F.
The Cat. No. 150D does not have test points. Thread up and play a length of Cat. No. 69T
test film at Dolby Level as the signal source. Set the unit to Format 04 for the calibration
steps that follow in section Section 2.3.6 - Calibration Procedure.
Note: Alignment in Format 05 or mono will result in incorrect levels.
2.3.3 Connecting to a DA10/20 Digital Adapter
When checking levels in a theatre or print-checking facility, the Model 737 derives its
input signals directly from the J8 connectors on the back of the DA10/20. The following
table lists the CP Audio Out Conn. J8 pin number signal assignments and the nearest
ground pin.
Table 2-5 DA10/20 Audio Out Conn. J8 Signal Assignments
For each channel, the active pin of the output is wired to pin 2 and the ground to pin 3
of that channel’s XLR connector. If the units are in the same rack, there should be a
connection between the metal parts of the Model 737 and the digital adapter. If the
Model 737 is not in the same rack, there must be a connection between any of the
ground pins (1, 4–13) of J8 and one of the ground pins on the 8-pin power and control
connector on the rear panel of the Model 737.
When used in a theatre to check released prints, thread up and play a length of Cat. No. 69T
(US) SR.D test film at Dolby Level as the signal source (Cat. No. 1012 is still available
but seldom used).
Output Active Ground
Left 14 9
Center 20 12
Right 17 11
Left Surround 15 10
Right Surround 2 1
Subwoofer 24 13
MAIN