2673  1/2-inch Microphone Preamplifier with insert voltage facility

Type 2673 consists of a high impedance input stage and an output stage giving a low output impedance for driving long cables and the Driven Guard surrounding the input stage. The thread which accepts the microphone cartridge is isolated from the preamplifier housing to allow an insert-voltage signal to be applied in series with the microphone for determination of the microphone’s open-circuit sensitivity.1/2-inch Microphone Preamplifier Type 2673 is very similar in design and performance to another Falcon Range product  –  Type 2669. The main difference is that Type 2673 includes an insert voltage calibration facility.

The Insert Calibration facility is used for reciprocity and insert voltage calibration of condenser microphones in accordance with IEC 1094 – 1: 1992 and ANSI S1.10.

  Documentación técnica

Usos

  • Insert voltage calibration of condenser microphones for open-circuit voltage determination
  • Calibration of condenser microphones with respect to reciprocity calibration methods
  • General sound measurements in connection with Brüel & Kjær condenser microphones

Características

  • Full electromagnetic compatibility (EMC)
  • Detachable cable for easy installation
  • Compact LEMO connector for connection to instrument input socket (adaptor for Brüel & Kjær connectors provided)
  • Wide dynamic range
  • Very low attenuation

EMC Certification

Microphones and Sockets

For insert voltage calibration of 1" microphones the adaptor (UA 0786) provided with the preamplifier must be used. This adaptor fulfils the requirements of microphone calibration standard IEC 1094 – 1.

The preamplifier is delivered with a 3 m detachable cable (AO 0419) which fits the new LEMO standard preamplifier input socket. Adaptor UA 1405 is provided for converting the preamplifier to traditional 7-pin Brüel & Kjær sockets.

For insert voltage calibration, the preamplifier may be connected directly to the preamplifier input socket of Frequency Analyzers Types 2010 or 2120 and Measuring Amplifiers Types 2606 and 2607, which also supply the insert voltage. This may originate either from the 1 kHz reference oscillator built into these instruments or from an external signal source such as Sine Generators Types 1049 /1051, allowing calibration at other frequencies and signal levels. For other Brüel & Kjær instruments such as Measuring Amplifiers Types 2610 and 2636, which do not provide direct insert voltage calibration, the cable included with UA 1405 can be used, or adaptor WB 0850 (not included) and an external oscillator.

Type 2673 is also used together with Reciprocity Calibration Apparatus Type 4143 which is designed for the reciprocity calibration of condenser microphones in accordance with IEC 1094, insert-voltage calibration, comparison calibration, and the measurement of the frequency response of condenser microphones using the electrostatic-actuator technique.

Note: When used in association with an electric actuator, it is recommended that you connect an external ground wire between the Preamplifier body and the actuator supply, to avoid interference from the actuator current. A clip (DM 0270) is provided for this purpose.

Accessories

For connecting an electrical input directly into the preamplifier, use Input Adaptor JJ 2617 together...

Para una descripción completa y especificaciones, consulteDocumentación técnica
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