3
1176 LN Operation
Meter Function / On-Off Pushbutton Switches
The pushbutton switches located to the right of the meter are used to determine the
metering mode as well as to turn the unit on and off. The 1176LN is turned on by
selecting any pushbutton other than the Off selection.
The VU meter can be used to indicate either Gain Reduction or output level. When used to
measure output level, the user can choose either +4 or +8 dBm output. The Meter function
is determined using the four pushbuttons to the right of the meter. When GR is depressed,
the meter reads Gain Reduction level in dB. When the +4 or +8 buttons are depressed,
the meter displays the limiter output level. When +4 is depressed, a meter reading of 0
corresponds to an output level of +4 dBm.
Compression Ratio
The four pushbutton switches to the left of the meter control the compression ratio. Four
ratios are provided: 20:1, 12:1, 8:1, and 4:1. The 20:1 and 12:1 settings are typically
used when peak-limiting is desired, while the 4:1 and 8:1 settings are used for general
dynamic range compression.
Input Level
The 1176LN uses a fixed threshold level, and utilizes the Input Level control to determine
the relative threshold as well as the total amount of gain reduction.
In order to set the limiter to provide a specific amount of compression, first adjust the Input
and Output controls to a fully counterclockwise (CCW) position. Adjust the Attack control
a few degree clockwise (CW) so that Gain Reduction is enabled. Use the Meter
pushbutton switches so that the meter reads Gain Reduction. Rotate the Input Level control
CW until the desired amount of gain reduction is achieved.
Output Level
Once the desired amount of limiting is adjusted by setting the Input Control, the Output
Control can be used to set the required output level.
Set the meter to measure the output level by pressing either +4 or +8. Adjust the Output
Control until the desired output level is achieved.
Attack Control
The Attack Control adjusts the time it takes the limiter to respond to an input signal and
adjust the gain appropriately. Additionally, when it is in the fully CCW position,
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