Page 62 - Volume 12, Issue 2 - Spring 2012

Instrumentation
Dick Stern
Acoustical Society of America Melville, New York 11747
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Dytran Instruments, Inc., a manufacturer of piezoelectric and DC
Micro-Electro-Mechanical Systems (MEMS) accelerometers, force
and pressure transducers and associated electronics, has introduced
the model 4753B, a miniature IN-LINE CHARGE AMPLIFIER
DESIGNED FOR USE WITH HIGH TEMPERATURE CHARGE
MODE ACCELEROMETERS. This Integrated Electronics Piezo Electric
(IEPE) unit is powered using constant current sources and is compatible with
IEPE designated instrumentation. Charge amplifiers convert electrostatic, high
impedance charge signals generated by charge generators, such as charge mode
accelerometers, to lower impedance voltage mode signals that can drive longer cables without
signal degradation. The Model 4753B is specifically designed to operate with high temperature charge
mode sensors because of its ability to tolerate very low levels of insulation resistance. This is a typical char-
acteristic of high temperature piezoelectric accelerometers, and would force a conventional charge amplifier to shut down. The Dytran model 4753B can accept sensors with insulation resistance as low as 100kOhms without any deterioration in perform- ance. Available with a sensitivity of 10 mV/pC, the model 4753B is offered with a 10-32 jack input connector and BNC jack output connector, and features extremely fast turn-on time (<5 seconds). Contact: www.dytran.com
Mull it Over Products, of Grandville, Michigan announced the introduction of its patent pending MULL IT OVER TRIM CAPS which prevents sound transmission through the mul- lions in buildings with glass facades. A standard mullion has a sound transmission rating of 28. With the Mull It Over Mullion Trim Cap installed, the STC rating increases to 57. With an STC rating of 57 and a low profile 7/8” return leg, this mullion cap delivers high performance in a compact size. This mullion cap is compatible with most curtain wall systems with standard demising wall construction—making it the standard wall ter- mination detail for buildings with store front, curtain wall, or ribbon wall facades. Contact: bruce@mullitover.com
Editor’s Note—The items printed in “Instrumentation” are reported for informational purposes only and are not necessar- ily endorsements by the Editor, Acoustics Today, or the Acoustical Society of America.
Instrumentation 61