A wide range of microphone preamplifier extension cables, adaptors and related products is available from Norsonic. Special attention is paid to the quality aspects – there is nothing as frustrating as cables and accessories that fail to work after a short while. Our products have been designed for many years of safe, reliable operation and to withstand rain, extreme temperatures and mechanical stress.

Microphone cable design

Preamplifier cables are an important part of a measuring system. Broken cables or low quality connectors cause many problems. It is therefore important that the microphone preamplifier cables and connectors are made of high quality material that withstand rain, extreme temperatures and mechanical stress. Norsonic has a therfore developed a wide range of microphone preamplifier cables and adaptors well suited for all applications.

The Norsonic “blue” preamplifier cable is a high performance, yet thin and flexible cable for use with Norsonic range of preamplifiers as well as other leading manufactures of acoustical instrumentation, following the 7 pin Lemo 1B standard, once developed by Norsonic, and later adopted by almost all manufactures.

The Norsonic microphone cable is made of high flexible copper wires coated with silver, each conductor insulated with Teflon, a material that has an extremely low absorption of water. This ensures high insulation under all environmental conditions and therefore no risk of leakage of the 200V polarisation voltage when cables are used in the field. The tinned copper braided screen give a high shielding effect to high frequency electromagnetic fields as well as low frequency fields such as the mains frequency.

The outer insulation is made of Polyurethane, a strong and flexible material even at low temperatures. The Norsonic microphone cable is also special treated with a material doped into the Polyurethane to ensure a low friction and highest possible flexibility.

Polyurethane is superior too PVC and silicone. Although PVC is attractive since it is a low-cost material, it has the disadvantage of becoming non-flexible at low temperatures and being unacceptably weak when it comes to mechanical stress. Silicone is a more flexible material than Polyurethane; the main drawback is its sensitivity to mechanical stress. It is therefore not considered suitable for field use.

The capacitance is kept at a minimum, and is typically 80pF/m. Suitable operating temperature range is -40 to +105 oC. Cable diameter is 4.8mm.

The Norsonic preamplifier extension cable comes in several versions. Common for all are the use of high quality cable and connectors with gold plated contact pins and the connector housing is protected with a special rubber sleeve (Nor1408A only). This protects the connectors in use from moisture, dirt and bumps.

A waterproof version of the cable system is also available (Nor1485). This enables the use of the cables down to a water depth of 100m. The waterproof cable systems require use of adaptors (Nor1475 and Nor1476) in both ends of the Nor1485 cable in order to enable a connection of waterproof connectors to standard Lemo connectors.

Available cables

The Nor1408A cable are delivered in several lengths. Standard lengths are 5, 10, 20, 30 and 50 metres. Other lengths available on request. The Nor1440 comes with a Brüel & Kjær male plug (B&K type JP0715) in the one end and a Lemo female connector in the other end. This cable is used for adapting the Norsonic preamplifier to measuring equipment with B&K socket. Standard length is 10m. Other lengths upon request. Frequently, a 2m cable is sufficient. Hence both 1408A and 1440 are available in 2m versions, but under separate names and without the special rubber sleeve. A 2m Lemo/Lemo cable is referred to as Nor1410A while a 2m B&K/Lemo cable is referred to as Nor1406.