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DC differential amp touts less than 20µVrms noise input

04 Jun 2013

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Measurement Specialties has released a 3-channel DC differential amplifier boasting an exceptionally low noise input of less than 20µVrms. According to the firm, the Model 121 enables precision measurement on up to three channels simultaneously.

Offering programmable gain up to 9,999 and user-defined output scaling, the signal conditioner is geared for bridge-type or differential output accelerometers, pressure transducers and load cells.

The unit's low noise floor over a wide frequency bandwidth up 200kHz makes for exceptional, accurate measurement of dynamic signals, stated the company. The Model 121 is used in a variety of instrumentation lab, vibration and shock testing as well as process monitoring applications.

Full scale accuracy is ±0.5 per cent and linearity is ±0.1 per cent. The Model 121 also features an auto-zero function that can be initiated by the operator to maximise voltage span in the data acquisition system. Each of the amplifier's three channels features a 9-pin D-sub connector. Input impedance is less than 1MΩ.

User-configurable shunt calibration can be applied via an internal or external resistor to any of the four legs of the transducer under test. Default shunt value is 150kΩ.

Testing parameters of the Model 121 can be easily set from the unit's front panel via a simple push button interface. The unit stores settings for all functions on internal memory, and will automatically restore the last session's settings on power-up.

Weighing 8.2lbs and constructed of durable aluminium, the unit is easily transported for use in a variety of testing environments, added the firm. The 3-channel Model 121 DC differential amplifier is available.

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