Reciprocity Calibration Apparatus Type 5998 is an easily operated high-precision and high-stability laboratory instrument designed for precision calibration of condenser microphones by the reciprocity method.
The apparatus determines the electrical transfer impedance as described in IEC 1094 – 2, and can calibrate microphones which fulfil IEC 1094 – 1, Laboratory Standard Microphones.
The system allows measurements to be done semi-automatically, but Type 5998 can be used in combination with the other instruments to do manual reciprocity calibration measurements, though of course these take longer than if using computer controlled measurement sequences.
Type 5998 includes all the couplers and adaptors necessary for manual or automatic calibration. In addition, calibration requires the use of an external voltmeter, filter and generator. These are available from Brüel & Kjær as Reciprocity Calibration System Type 9699, described on the first pages of this Product Data Sheet.
Apparatus
Each microphone channel has built-in relays to allow external control of the apparatus via its IEEE – 488 interface bus and selection of the required measurement configurations. This allows a PC to control an automatic sequence that measures the transmitter /receiver electrical transfer impedance. Software to control Type 5998 is included in Reciprocity Calibration System Type 9699.
The instrument also includes a high-precision 200 V polarization voltage supply for the condenser microphones. The polarization voltage can be checked using an external digital voltmeter connected to Type 5998. Any deviations can be adjusted by ± 1 V using a potentiometer accessible from the front panel. As an alternative, an external polarization voltage can be applied if voltages other than 0 V or 200 V are required.
The microphone capsules are connected to Type 5998 via the appropriate preamplifier and cable, terminated in a LEMO...
For a full Description and Specifications, see Product Data
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