Lab.gruppen PLM Series Operation Manual

Also see for PLM 10000Q: Supplementary guide User manual addendum Specifications Quick start Technical data

Contents

Lab.gruppen PLM Series Operation Manual Manual pdf 76 page image

70Back Panel InterfacePLM Series Operation M anual R ev 1.3.58.2.4 Iso-Float Electronic BalancingThe analog input electronic balancing circuits use the Lake Iso-Float system.The Iso-Float technology combines the benefits of transformer-coupled isolation with the advantages ofclean, direct-coupled inputs. The audio converters are galvanically isolated, and not connected to the mainground. High-quality transformers and opto-isolators create a barrier between the device and possiblegrounding aberrations from the outside electrical environment.Iso-Float settings are adjustable via the front panel menu or the Lake Controller software.8.3 AES3 Digital I/O8.3.1 AES3 XLR ConnectorAES3 digital audio input is via an XLR3F connector, which is directly paralleled to the adjacent XLR3M AES3Link connector. Wiring of this connector follows the same standard as for analog XLR connections as shownsection 8.2.2.AES/EBUINPUT 1-2 LINK 1-2Figure 8-15: AES3 XLR Input and Link ConnectorsFigure 8-12 on page 69 shows the only possible method of wiring; there is no equivalent of an unbalancedconnection in the digital domain.The AES3 signal format carries two channels of audio and associated data on a single cable/connector.Selection of Ch 1 or Ch 2 is performed within the digital processing section of the PLM and is controlledfrom the menu system. Please refer to section 7.11.3.1 for further details.The AES3 Link connector may be used to daisy-chain the inputs of multiple PLMs together. Unlike daisy-chaining of analog inputs, attention must be paid to line termination. When daisy-chaining PLMs together,only the last PLM in the chain should be set to TERMINATED. All other PLMs should be set to UNTERMI-NATED. When a PLM is powered off (disconnected from mains power) the AES3 input is UNTERMINATED.Please refer to section 7.11.3.2 for further details.As with balanced analog audio, there is a finite limit to how many PLMs may have their AES3 inputs daisy-chained together. The practical limit will be determined by cable type and length as well as the output circuitof the driving source. It may be necessary to employ an AES3 line driver or distribution amplifier to achievereliable results in some situations.