VAR4 / VAR12 / VAR20 - Operation Manual
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Is
Page 185 of 308
An ASL amplifier connected to this input requires the pulse interval to be set to 20 seconds, as
described in Section “
6.3.4.2.3 Configuring an Amplifier’s AC Surveillance Interval
”.
Default value:
‘
−
12’
•
[Mode=Pulsed]
A pulsed surveillance tone with 20 seconds pulse interval is generated at the selected output.
Default value:
‘Mode=Pulsed’
5. Move to, and scroll the possible tone levels until the required value is displayed in the right field:
Mode=Pulsed [Level(dB)-12]
Possible values:
−
40 to 0dB (1dB steps)
Note:
In a typical ASL system, the normal settings would be: ‘Pulsed’ and ‘
−
12dB’.
6. Save the changes by pressing the SELECT key, or cancel by pressing the BACK key.
When the system’s AC surveillance is being set-up, the surveillance tone produced by the
VAR Router is made continuous even if set to pulsed. This is because the amplifier
surveillance system needs a continuous signal to acquire its surveillance tone thresholds.
When the set-up menu is exited, the tone automatically returns to pulsed operation.
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Содержание VAR12
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