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device’s nominal level matches the Model 45’s level setting its actual nominal level may be significantly different. With a digital matrix intercom system this problem could be due to an incorrect configuration hav- ing been made to a specific channel or port. For example, the RTS ADAM system has a published nominal level of +8 dBu, but using its configuration software it’s possible to set panels or ports to a level different than nominal. The best solution in this case is to adjust the associated port on the intercom system so that its levels comply with +4 dBu. This should, at least in theory, lead to the best system perfor- mance, including correct interfacing with the Model 45. But often it’s impossible to “clean up” the levels of an existing system.
The “to”
It’s also possible that an error is pres- ent on the
Auto Null
The Model 45 contains circuitry to auto- matically null the two
A pushbutton switch is provided to activate the auto null process. Refer to Figure 7 for a detailed view. To initiate auto null requires simply pressing and releasing (“tapping”) the button. The process begins by nulling channel 1 of the interface and, when completed, moves on to channel 2. Two LEDs provide a visual indication of the auto null process, flashing when the auto null process for its respective channel is active.
Figure 7. Detail of front panel showing auto null section
Issue Preliminary 2, March 2009 | Model 45 User Guide |
Page 22 | Studio Technologies, Inc. |