Installation manual

2–28 Hardware installation
All VU and PPM meter outputs require frequency information for the filtering functions. This information is ob-
tained from the reference section of the DAP. If operating at frequencies other than + or – 4% of 32 kHz, 44.1 kHz,
or 48 kHz, the meters will show incorrect ballistics.
10. AES vari speed. This mode is the same as the AES Automatic mode mentioned above except that the low–jitter
PLL circuits are never enabled. This mode is mainly provided for factory test to confirm correct operation of the
primary PLL circuitry.
The same problem with frequency filter information applies as mentioned in 11 above, but an additional problem
may occur due to the absence of low–jitter internal clocks. The DMX 3500 digital–to–analog convertor board re-
quires low–jitter reference clocks to provide the lowest distortion for D–to–A conversion. In this reference mode,
any incoming jitter is not attenuated. Increased jitter on conversion clocks has been shown to cause distortion on
analog converted outputs. In order to provide the highest quality monitor outputs either mode 1 or 4 should be used.
11. Manual override. When configuration software is set to this position, then the internal rotary DIP switch can be
used to set reference modes.
Manual override can be useful when it is desired to use one DAP in a system as a master Sync generator locking
to a video reference. When using software configuration, the reference section will not function correctly during
a download from the Jupiter file server. This could cause an interruption of sync reference for those devices locking
to the DAP master.
We recommend that when using the DAP as the master sync generator, that the reference mode be set to manual
selection in the Jupiter configuration tables, and that the manual rotary DIP switch be used to set reference modes.
This will allow the reference section of the DAP hardware to continue to provide correct reference signals even
during a download from the Jupiter file server.
The options that can be selected form the rotary DIP switch are the same as those from the File Server configuration
tables. They are as follows:
0. 48 kHz narrow
1. 48 kHz NTSC video
2. 48 kHz PAL video
3. 48 kHz internal
4. 48 kHz AES auto
5. 44.1 kHz narrow
6. Not used
7. Not used
8. 44.1 kHz internal
9. 44.1 kHz AES auto
A. AES automatic
B. AES vari speed
C. Not used
D. Not used
E. Not used
F. Software Configuration (Using File Server information, Factory Default)
To use internal DIP switch, set software to Manual Override.