Iso-Float; Aes/Ebu Input Termination; Attenuation Submenu - Lab.gruppen PLM series Operation Manual

9. Front Panel Interface
dB. This parameter may be adjusted by pressing the associated soft button to highlight the current sensitiv-
ity/offset value, and using the rotary encoder.
All input selection and sensitivity parameters may also be adjusted from the Lake Controller software.

9.13.3.2 Iso-Float

This option is selected by pressing soft button 4 (Iso-Float) from Menu è Input Cfg.
The PLM's analog inputs utilize Iso-Float transformerless electronic balancing circuitry. This provides electri-
cal isolation from an analog source comparable to that achieved with transformer-based designs. However,
pin 1 of the XLR input connector may be connected to ground within the PLM if desired. This option is
selected by using the rotary encoder to toggle between Floating and Grounded. It may be necessary
under some circumstances to alter this setting to resolve ground loop problems when using analog inputs.
The Iso-Float setting may also be adjusted from the Lake Controller software.

9.13.3.3 AES/EBU input termination

This option is selected by pressing soft button 8 (AES Term) from MenugInput Cfg.
Please see the warning regarding using AES/EBU
signals at section 6.2.1.
For fault-free operation when using AES/EBU digital audio as an input source, inputs must be correctly
terminated with the characteristic impedance of 110 ohm. Whether a particular unit in an set of multiple
PLMs should have its AES/EBU input terminated will be determined by the method used to distribute the
AES/EBU signals.
If the PLM is at the end of a distribution line, its setting should be Terminated. Otherwise, it should be
Unterminated. If an AES/EBU distribution amplifier (DA) is being used to distribute the digital audio signals,
with one DA output per PLM, then all terminations should be on. However, if the AES/EBU link connectors
are being used to "daisy-chain" the PLM inputs together, then only the "last" PLM in the chain should have
its termination set on.
Once the Menu è Input Cfg è Aes Term page is displayed, the rotary encoder can be used to change
the termination setting from Unterminated to Terminated.

9.13.4 Attenuation submenu

This submenu is selected by pressing soft button 4, labeled Attenuation from the menu top page.
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PLM Series Operation Manual rev 1.1.3