SCS 9001

Sound and Vibration

SCS 9001 – N & V Measurements Systems verification and calibration

SCS9001 SYSTEM TO PERFORM COMPLETE ACOUSTIC CHECK OF: Sound Level Meter, Noise Dose meters, 1/1 and 1/3 octave Analyzers, Acoustic Calibrators, Microphones and Preamplifiers, DAT Recorders, Vibration Transducers and Vibration Calibrators, Signal Conditioners .

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The SCS 9001 (optionally) extended for vibration measurements

Accelerometers traceability, Vibration calibrators, Force transducers, Velocimeters, etc.

• Easy to use and eliable
• Sound level meters and integrating SLM, Noise dose meters
• 1/1 and 1/3 octave analyzers
• Acoustic calibrators, microphones and preamplifiers, DAT recorders
• Standards IEC: 651, 804, 1672, 225, 1260; ANSI: S1-4-71, S1-11-86; BS: 5969-81, 6698-86
• Microphone freq. resp. tracing w/ elecrostatic actuator or acoustic coupler
• Extension for accelerometer sensitivity and frequency response
• Versatile high performance test unit SCS 5013A

SCS 9001: Acoustic Measurement System

From the first DOS release SCS 9001 in 1994, to the present MS-Windows version, a lot of new features have been added, but in the meantime the system has become much more compact and simple.
The SR-DS360 synthesizer and the high precision reference voltmeter are PC driven through the IEEE-488 interface, to generate and measure all the test signals required for the SLM tests: RMS levels, crest factors, frequency response, weighting filters, polarisation voltages, etc.

The SCS 5013A front end provides the preamplifier power supply, the low noise amplifier, the electrostatic actuator driver. A pistonphone is the class 0 “Acoustic Source Reference”

Acoustic: Main Procedures implemented

Sound Level Meters are electrically tested using the synthesizer and the reference voltmeter for: full scale attenuator, self noise, primary range linearity, weighting filters, RMS time constants, peak detector, averaging, overload detector.
The microphone test can be performed using an acoustic coupler where two microphones are mounted face to face, one of them being the reference, or alternatively with an electrostatic actuator providing special insulated microphone grids to be fitted on the microphone under test.

In the Filter section there is a test of filter shape on 17 points and the filter response time according to IEC 1260.

Calibrators are tested for exact level produced using an “Insert Voltage” preamplifier connected to the SCS 5013A front-end unit, exact frequency generated and THD can be measured with an FFT analyzer.

The software interface guides the operator through all the tests and for preparation of results files which are automatically read by Microsoft Word (MACRO) to prepare a test report. Results data are stored in an internal data base in Microsoft Access.

Vibration: Main Procedures implemented

Accelerometers are tested using the synthesizer, the reference voltmeter and a reference transducer in a back-to-back or side-by-side configuration, using an electrodynamic shaker as a vibration source.
Frequency response and sensitivity can be tested with “unlimited” frequency steps.
Linearirty range is verified by automatically repeating the test at different vibration excitation levels in “unlimited” resolution steps. Several accelerometers can be traced at the same time, providing a suitable shaker fixture and necessary force level.

SCS 9001 components

ACOUSTIC

STANFORD RESEARCH DS360 synthesizer
AGILENT or KEITHLEY Multimeter
SCS 5013A Front-end
GRAS or BK Reference microphone
GRAS or BK Reference Pistonphone
GRAS electrostatic actuator (and/or) BK acoustic coupler
GRAS “Insert Voltage” preamplifier
SCS 8200 software series
Standard PC with IEEE 488 interface
Several accessories and 19” standard rack

VIBRATION (add on)

References

APAT ROMA
ASL Siena
Modulo UNO