Avsl CSM660 Installation and Operating Instructions

Brand: Avsl

Model: CSM660

Type: Installation and Operating Instructions

PAGING MICROPHONE MODEL CSM660 DATA SHEET Rev 2.0

GENERAL DESCRIPTION

The paging microphone is of the desktop type and designed to be used for paging and announcements. It is

furnished with an easy to use talk switch and a convenient locking lever. In addition, the unit provides a

remote-control function to activate the amplifier's "claim" or chime function. Refer to your amplifier's

instruction manual for details of the available functions and connections.

CIRCUIT DIAGRAM

PPEARANCE

The microphone is supplied with a 5-pin DIN style connector pre-fitted.

This allows direct connection to the AVS AVU2001 or AVU2002 pre-

amplifier/line-driver units.

If required, this plug may be removed, and a different connector fitted.

Most preamplifiers or mixer amplifiers typically require a 3-pin, XLR

type plug, or a 3-pole 6.3mm (1/4”) jack plug.

The wiring for these types of connector is shown below.

HOT = MICROPHONE “HOT” WIRE

COM = MICROPHONE SCREEN WIRE

COLD = MICROPHONE “COLD” WIRE

NOTE the drawing of the ¼” JACK plug (below left) shows the elements of the connector. As the actual

internal terminals frequently differ from one manufacturer to another, you should use an ohm-meter to

establish which terminal of the plug is connected to which element (Tip, Ring and Sleeve).

NOTE the drawing of the XLR plug (below right) shows the REAR of the plug (the wiring side). Use pin

numbers as a reference, as plug pins and socket pins have their positions reversed. Refer to your amplifier's

instruction manual for details of the required connections

Typical 3-pin XLR Plug

Typical 6.3mm Jack Plug

HOT

COLD HOT SCREEN

COLD

SCREEN

DOCUMENT NUMBER AVS/CSM660/OEM/01 REV 2.0 25

November 2005 Page 2 of 3

As you can see from the circuit diagram, the microphones’ capsule is short-circuited by one half of the push-

to-talk switch. This means that the output wires (White & Red) are a short-circuit when the PTT switch is not

pressed, thus preventing any signal at all reaching the amplifier.

When the PTT switch is pressed, this short-circuit is removed, and the audio from the microphone capsule is

fed into the amplifiers’ input. At the same time, the second half of the PTT switch places a short-circuit

across the Blue & Black wires and these may be used to trigger an external action e.g. the “Chime” in a local

device, such as the AVU2002 pre-amplifier/line driver.

IMPORTANT SAFETY NOTICE :-

For safety reasons, the shield (or screen) of the microphone cable must be earthed at the equipment end.

Most equipment with microphone inputs has its’ chassis at earth potential, but some (typically low-voltage

supplied devices) may not. It is the installers’ responsibility to ensure that the microphone is

adequately earthed!

TECHNICAL SPECIFICATIONS

MODEL CSM660B

TYPE Moving Coil Microphone

Polar Pattern Unidirectional

Impedance 600 Ohms, Balanced

Sensitivity -58db @1 KHz (0db = 1V Pa)

Frequency Response 100Hz-10KHz

Connection Cable 2 core shielded + 2 core cable

Cable Length 2.5m (8 ft 2 ins)

Terminal Connector 5 Pin DIN Plug

Weight * 440 g (0.97 lb)

Dimensions 100 (W) X 215 (H) X 150 (D) mm (3.9 X 8.5 X 5.9 Ins)

Talk Switch Push-to-Talk (Short off circuit, with locking lever)

Remote Switch Leaf Spring Contact (Interlocked with Talk Switch)

Finish HEAD : Zinc Plated Steel Wire, Baked Paint (Grey)

BODY : ABS Resin (Grey)

* Weight given in the above table does not include the connection cable or plug.

DOCUMENT NUMBER AVS/CSM660/OEM/01 REV 2.0 25

November 2005 Page 3 of 3

Avsl CSM660 Installation and Operating Instructions

Brand: Avsl

Model: CSM660

Type: Installation and Operating Instructions

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Avsl CSM660 Installation and Operating Instructions

Avsl CSM660 Installation and Operating Instructions

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