Products

Technology

Introduction

The GRAS 90CA-S2 Microphone Calibration System provides for automated and reliable level and frequency response calibration of measurement microphones. The implemented calibration methods conform with these standards:

IEC Standard 61094
ANSI S1.10 – 1966 (R1976)
IEC Standard 60942
TEDS Standard IEEE 1451.4

The 90CA-S2 is based on National Instruments' PXI architecture: NI PXIe-8101 Embedded Controller, including: National Instruments PXIe1071 4-Slot 3U PXI Express Chassis and PXI cards for Control and Data Acquisition.

Features

Ready-to-use software and hardware
Accurate calibration hardware
Automated and computer-controlled calibration process
Highly reproducible calibration method
Pre-installed test parameters for GRAS microphones
Test conditions easily changable
Auto-generated, customized documentation to print and archive

Applications

All types of IEC 61094 standardized 1", 1/2", 1/4", and 1/8" measurement microphones from GRAS and other manufacturers
GRAS 46xx series standard microphone sets
GRAS 47xx series flush-mount microphone sets (optional)
GRAS preamplifiers
Calibration up to 92 kHz (optional up to 200 kHz)

The system is described in more detail in the Instruction Manual.

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Specifications

IEC standard

61094-5 & 61094-6

Sensitivity Calibration
Method		Pistonphone, class 0
Frequency		250 Hz
Uncertainty		0.07 dB
Frequency Calibration
Method		Electrostatic actuator
Frequency		20 to 92 kHz (20 to 200 kHz)*
Uncertainty		0.3 dB
*With HP34410a (or similar) multimeter, not included.

GRAS Sound & Vibration reserves the right to change specifications and accessories without notice.

Ordering info

Included items

GRAS HW1002	PXI: NI PXIe-8821 Embedded Controller, including National Instruments PXIe1071 4-Slot 3U PXI Express Chassis NI Dynamic Signal Acquisition Board PXI-4461, and National Instruments Digital I/O PXI-6509
GRAS SW0013	National Instruments software Diadem version 2017 (or later), Base Edition
GRAS SW0002	Calibration System Software for 90CA
GRAS SW0012	National Instruments Sound and Vibration Analysis SW Run-Time License 779875-01
For Level Calibration
GRAS AL0017	Pistonphone Calibration Stand
GRAS 42AP	Intelligent Pistonphone, including RS-232 control cable
GRAS 26AN	¼” LEMO Insert Voltage Preamplifier
GRAS 26AG	½” LEMO Insert Voltage Preamplifier
For Frequency Calibration
GRAS 26AB	¼” LEMO Preamplifier with Inline Barrel Adapter AF0008 for ¼” preamplifier and ½” microphone
GRAS 26AK	½” LEMO preamplifier (for use with most non-GRAS microphones)
GRAS RA0014	½” Electrostatic actuator (includes ¼” microphone adapter RA0017)
GRAS AL0010	Actuator Calibration Stand
GRAS AL0021	Microphone Set Calibration Stand
GRAS 14AA	Electrostatic Actuator Amplifier, including 230 V AC power cable
For Power, Signal Conditioning and Switching
GRAS 12AQ	2-Channel CCP/LEMO Power Module with Signal Conditioning and Computer Interface
GRAS RA0192	Control box (no cables included in the box)
GRAS 40AG	½” Pressure microphone for reference
Cables, Connectors, Adapters and Tools
GRAS AA2006	National Instruments Cable 180524-10 (50-position ribbon cable)
GRAS AA0033	1 m BNC cable (5 pcs)
GRAS AA0074	1 m LEMO extension cable (2 pcs)
AC0021	BNC T-connector
GRAS RA0003	Straight adapter for ½” microphone and ¼” preamplifier
GRAS RA0063	⅛ microphone and ¼” preamplifier adapter
RA0081	½” microphone tool
RA0200	¼” microphone tool
RA0210	⅛” microphone tool
Documents
-	GRAS license for SW0002
LI0028	90CA Instruction Manual
-	Instruction manuals for 42AP, 12AQ and 14AA