Airborne charge amplifiers Model 2680M1-M7 PIN FUNCTIONS • For use with piezoelectric transducers • Small, rugged, light weight • Dual outputs, biased and unbiased • Adjustable gain • Optional low pass filter Table 1: Gain ranges Table 2: Frequency response Models 2680M1-XXX through 2680M7-XXX charge amplifiers are designed for use with piezoelectric transducers and are suitable for airborne applications. Hybrid microcircuit construction results in small size, ruggedness and low power consumption. The airborne charge amplifiers have an output voltage proportional to the input charge. As a result, the amplifier sensitivity is not appreciably affected by the capacitance of the input cable. The use of modular construction techniques permits great versatility in gain and filter choices. This unit has two outputs, a biased output and an unbiased output. Both outputs are adjustable with a common gain control. The M1 through M7 defines the charge gain per Table 1. The -XXX describes the upper cutoff frequency (-5% point) per Table 2. For example, a -101 has a low pass filter which is flat up to 100 Hz, a -502 has a low pass filter which is flat up to 5000 Hz. ENDEVCO www.endevco.com Tel: +1 (866) ENDEVCO [+1 (866) 363-3826] Piezoelectric accelerometers | Piezoresistive accelerometers | IEPE accelerometers | Variable capacitance accelerometers | Piezoresistive pressure sensors | Piezoelectric pressure sensors | High intensity microphones | Inertial sensors | Signal conditioners and supportive instrumentation | Cable assemblies

Airborne charge amplifiers Model 2680M1-M7 Specifications The following performance specifications conform to ISA-RP-37.2 (1964) and are typical values, referenced at +75°F (+24°C) and 100 Hz, unless otherwise noted. Calibration data, traceable to National Institute of Standards and Technology (NIST), is supplied. Inputs Type Source resistance Source capacitance Overload recovery Piezoelectric single-ended with one side connected to signal ground 3 MO minimum 10 000 pF max A half sine pulse of 1ms duration and with an amplitude as specified in Table 1 (or less) will cause no spurious effects...

Airborne charge amplifiers Model 2680M1-M7 Accessories Contact ENDEVCO www.endevco.com Tel: +1 (866) ENDEVCO [+1 (866) 363-3826] Notes 1. Maintain high levels of precision and accuracy using Endevco's factory calibration services. Call Endevco's inside sales force at 866-ENDEVCO for recommended intervals, pricing and turn-around time for these services as well as for quotations on our standard products. Continued product improvement necessitates that Endevco reserve the right to modify these specifications without notice. Endevco maintains a program of constant surveillance over all products...