Dolby LM100 Broadcast Loudness Meter User's Manual

The Main Setup Menu
• Dolby E Program
• AES3 Channel Select mode
• Analog Input Cal (calibration) settings
On the LM100‐NTSC, you can also configure:
• RF Tuning Mode
• RF Channel
• RF Second Language
Input Source
In the Input Source menu, you can select the input to use for a measurement.
A special input source selection (RF/Digital) expects RF input by default, but
automatically switches to digital input if a valid Dolby E or Dolby Digital signal is present
on the Digital Input connector. This is used when the LM100‐NTSC is simultaneously
connected to the digital audio and the channel 3/4 remodulated outputs of a digital cable
set‐top box. Thus, when the set‐top box is tuned to an analog tiered service, the unit
measures the signal directly from the RF tuner; when the set‐top box is tuned to a digitally
tiered service, the unit autodetects the presence of a Dolby Digital stream from the S/PDIF
output on the digital set‐top box, and measures it.
Decode Format
Use the Decode Format menu to select the bitstream type you want the LM100 to decode.
This parameter is normally set to Autodetect. However, you can override this setting and
specify a bitstream type.
Dolby E Program
Use the Dolby E Program menu to identify which program to measure in a Dolby E
stream.
Note:
When the input source is a valid Dolby E signal, the selected Dolby E program
number must be present in the input stream, or no measurement can be made.
AES3 Channel Select
Use the AES3 Channel Select menu to specify how the unit recognizes a Dolby Digital
signal from the digital input.
Selecting Channel 1 or Channel 2 specifies that the Dolby Digital input must be
contained within that channel. Selecting Channel 1+2 requires a Dolby Digital stream in
both channels. When you select Autodetect, the LM100 locks onto the first signal it
recognizes. We recommend Autodetect unless there is a signal present in just one
channel.
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