4-14
MAINTENANCE ORBAN MODEL 8685
c) Verify that the frequencies measured at the 8685’s O
UTPUT 1/2 follow the
values Table 4-4 on page 4-11 within the given tolerances.
13. Test Digital I/O and Sync for Input/Output 3/4 (C/LFE).
Connect the 8685’s O
UTPUT 1/2 BNC connector to its INPUT 3/4 BNC connector,
connect the analyzer to O
UTPUT 3/4, and follow the procedure in step 4 by anal-
ogy. Use Setups A
UDIT38 through AUDIT42.
14. Test Digital I/O and Sync for Input/Output 5/6 (Ls/Rs).
Connect the 8685’s O
UTPUT 1/2 BNC connector to its INPUT 5/6 BNC connector,
connect the analyzer to O
UTPUT 5/6, and follow the procedure in step 4 by anal-
ogy. Use Setups A
UDIT43 through AUDIT47.
15. Test the Sync Input.
A) Connect the BNC “Tee” connector to the 8685’s S
YNC input.
B) Connect O
UTPUT 1/2 to one end of the “Tee” connector.
C) Connect I
NPUT 5/6 to the other end of the “Tee” connector.
D) Connect the AES3id analyzer to O
UTPUT 5/6 (where it should be already).
E) Follow the procedure in step 4 by analogy. Use Setups A
UDIT48 through
A
UDIT52.
F) Skip to step 17.
The
following steps test the optional HD-SDI module, which has three AES3id inputs
and outputs in addition to an AES3id/AES11id/Wordclock sync input.
16. Test the optional SDI/HD-SDI I/O module
Detailed instructions on testing the optional HD-SDI I/O are beyond the scope of
this edition of the manual but may be added in the future. An outline of the ap-
propriate tests is as follows:
A) Use a test set like the recommended Phabrix to verify that the 8685 can pass a
SMPTE-compliant SDI/HD-SDI signal from its input to output at 480i, 480p,
720p, 1080i, and 1080p at frames rates of 24, 25, and 30 frames/second and
24*(1000/1001) and 30*(1000/1001) (pull-down) frames/second.
B) Verify that the rise time, fall time, and jitter appearing at the 8685’s SDI out-
put meets the following SMPTE specifications. Be sure to use cable with 75
ohm coax and connectors; 50 ohm cable/connectors will degrade the perform-
ance.
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