18 25-Seven Program Delay Manager
Version 2.3 Manual April 2013
Input Level Meter
PDM’s four color-coded LEDs indicate audio input level at the processor. They’re con-
nected after the analog-to-digital converter on XLR-equipped PDMs, so they can accu-
rately monitor any input regardless of the
Input
Sensitivity
setting.
•
If all four LEDs are dark, the input signal is below
-36 dBFS. This usually represents normal studio
background noise, with no talking or music.
•
As the peak input signal increases between -36
dBFS and Full Scale, successive LEDs light up.
All four LEDs will light yellow if PDM is expecting a Livewire input but not seeing a valid
signal. This is usually a configuration problem. All four LEDs will also light yellow in the
unlikely event of internal error, even on XLR (analog and AES/EBU) systems.
PDM’s input meter shows instantaneous peaks as a diagnostic aid. It doesn’t display
RMS voltage or time-integrated level, and isn’t a replacement for the sophisticated
loudness meters found in a modern broadcast facility.
Detailed Operating Instructions
When PDM is first powered up, transport buttons will light, and the unit will be in By-
pass mode. After about 10 seconds, the LCD displays this initialization screen for a few
moments:
Welcome to
25 Seven Systems
PDM
Please wait...
Once the hardware is successfully initialized, the screen will update; the level meters
will show activity if there is a valid audio input. PDM stays in Bypass mode
1
, and a
screen like this appears:
PDM is in Bypass
10:32:00a
Menu
This says the current time is 10:32 AM. PDM can display time in 12 or 24
hour modes; see page 24.
Press
to enter the configuration menus.
After you turn off Bypass mode, the “ready” screen appears. This screen also appears
after you exit a delay.
1
You may also see a brief
Waiting
for
audio
stream
message while PDM initializes its audio hard-
ware.
Summary of Contents for program delay manager
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