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The Concept of the 90CA Microphone Calibration System
The G.R.A.S. Microphone Calibration System 90CA provides you with a convenient,
yet reliable and automated level and frequency response calibration of measurement
microphones and microphone sets. The 90CA calibrates in compliance with
• ANSI S1.10 – 1966 (R1976)
• IEC Norm 61094-1
• IEC 61094-6
An optional module for calibration of preamplifiers is available.
The 90CA is delivered with ready-to-use software and hardware, as well as preinstalled
test parameters for G.R.A.S. microphones and preamplifiers. The 90CA is available in
two versions: a PXI-based version with boards for mounting in a NI PXI Express chassis
and a PCI-based version with boards for use in a PC. Functionality and specifications are
identical for the two. See Packing List and Electrical Connections for further information.
Main Features
• A highly automated and computer-controlled calibration process
• Accurate calibration hardware
• Ready-to-use software and hardware
• Preinstalled test parameters for G.R.A.S. microphones and microphone sets
• Optional software for test of preamplifiers
• Test conditions easily changeable
• Highly reproducible calibration method
• Auto-generated, customizable documentation for printing
Fig. 4.
Example of a calibration certificate