Overview
The GRAS 90CA-S2 Microphone Calibration System delivers automated and highly reliable calibration of measurement microphones for both sensitivity and frequency response. The calibration procedures are performed in accordance with the following standards:
- IEC 61094
- ANSI S1.10 – 1966 (R1976)
- IEC 60942
- IEEE 1451.4 TEDS standard
The 90CA-S2 is based on the PXI architecture from National Instruments, featuring an embedded controller NI PXIe-8101, including:
- National Instruments PXIe-1071, 3U, 4-slot PXI Express chassis
- PXI modules for system control and data acquisition
Features
- Ready-to-use hardware and software
- High-precision calibration hardware
- Fully automated, computer-controlled calibration procedures
- High repeatability of calibration methods
- Predefined test parameters for GRAS microphones
- Easily adjustable test conditions
- Automatically generated documentation, customizable for printing and archiving
Applications
- All standard IEC 61094 measurement microphones in sizes 1", 1/2", 1/4", and 1/8" from GRAS and other manufacturers
- GRAS 46xx series reference microphone sets
- GRAS 47xx series flush-mounted microphone sets (optional)
- GRAS preamplifiers
- Calibration up to 92 kHz (optional up to 200 kHz)
The system is described in further detail in the User Manual.
Specifications
| Parameter |
Unit |
Value / Description |
| Standards |
– |
IEC 61094-5 & 61094-6 |
| Sensitivity Calibration – Method |
– |
Class 0 pistonphone |
| Sensitivity Calibration – Frequency |
Hz |
250 |
| Sensitivity Calibration – Uncertainty |
dB |
0.07 |
| Frequency Response Calibration – Method |
– |
Electrostatic actuator |
| Frequency Response Calibration – Range |
Hz |
20 Hz to 92 kHz (20 Hz to 200 kHz*) |
| Frequency Response Calibration – Uncertainty |
dB |
0.3 |
Note:
GRAS Sound & Vibration reserves the right to change specifications and accessories without prior notice.