User manual ASL INTERCOM PS 29 M

[. . . ] ASL has taken great care to ensure this product reaches you in flawless condition. 3. 0 INSTALLATION To connect the PS 29 M onto the intercom system, use professional flexible microphone cable with 2 wires and 1 shield only. Connect the system intercom cables into the LINE connector sockets on the rear panel. Finally connect the listening headset plug into the HEADSET connector, also on the rear panel. The PS 29 M is fully protected against mis-wiring (reverse power) or short-circuit in the interconnecting cables. This PS 29 M will form part of an existing or new intercom system, and connections to it is straightforward. [. . . ] Adjusting the sidetone does not affect the level of your voice as it is heard by other stations. 9 BUZZER VOLUME trimmer This trimmer adjusts the volume of the internal buzzer. The buzzer will be activated if a CALL-button is pressed for longer than 2 seconds and the buzzers are not muted on the power supply. 7 8 A side tone buzzer volume serial number 9 10 10 MIC GAIN The mic gain can be adjusted by a trimmer. gain headset intercom line A intercom line B User Manual PS 29 / Issue 1 © 2000 ASL Intercom, Utrecht, Holland. 5 7. 0 CABLING For the PRO Series Intercom system the interconnecting cables are of the shielded two-conductor microphone cable type and the intercom line connectors are of the XLR-3 type. XLR pin 1 is connected to the shield of the cable which functions as the common return for audio and power. Since the audio signal is transferred in an unbalanced Ú way, certain rules have to be obeyed when installing the cables of an intercom network. This is to avoid earth loops and to minimize power loss and the possible effect of electromagnetic fields. For interconnecting user stations, power supplies and accessories in an ASL Intercom network, use high quality shielded two-conductor (minimum 2x 0. 30 mm2) microphone cable only. In case of a multi channel intercom network, use high quality microphone 'multipair' cable only, each pair consisting of two conductors (minimum 2x 0. 15 mm2) with separate shield. Use flexible single and multipair microphone cable instead of cable with solid cores, especially when the cable is subjected to bending during operation or installation. The screen of each separate microphone cable and/or the screen of each single pair in a multipair cable, should be connected to pin 1 of each XLR-3 connector. Do not connect this cable screen to the metal housing of the connector or to metal wall boxes (outlets). Cable trunks, connection boxes and overall multipair cable screen to clean earth. Metal cable trunks, metal connection boxes and overall multipair cable screen should be interconnected and, at one point (the 'central earthing point') in the intercom network only, be connected to a clean earth or a safety earth. Keep metal connection boxes and cable trunks isolated from other metal parts. Metal housings for intercom cables and connectors should be mounted in such a way that they are isolated from other metal cable and connector housings and from any other metal construction parts. When two (multi channel) units in a network are connected by more than one cable, make sure that these cables are parallel to each other over the whole distance between those units. When using multipair cable, parallelism is ensured in the best possible way. So-called 'ring intercom' should not physically be cabled as a ring. All cable routes should have a 'star' configuration, with the central earthing point (usually close to the power supply position) as the center of the star. Intercom cables should cross high energy cables at an angle of 90E only. [. . . ] - due to the high bridging impedance offered by each station, the number of stations 'on line' has no influence on the level of the communications signal. It develops a DC potential over the line impedance which will be sensed by each station and interpreted as a Call signal. 30 mA quiescent 45 mA signalling 170 mA at max. impedance gain presence filter frequency response V electret mic 200 ohms 40 dB - 70 dB (adjustable internally) +6 dB at 5 kHz 200 Hz - 13 kHz (-3 dB) +9 V DC HEADPHONES DRIVER AMP max. output level normal 14 V rms (200 ohms) binaural 8 V rms (400 ohms) max. [. . . ]