DESCRIPTION

Model 6136 is a four-channel, programmable charge amplifier-filter with a second input for piezoelectric sensors with integrated electronics (IEPE).

The high-performance charge amplifier can be used to measure dynamic acceleration, pressure, force and strain from piezoelectric transducers. Two charge-to-voltage input ranges optimize performance according to transducer sensitivity. A programmable time constant enables it to make quasi-static measurements. The charge amplifier has 3X overhead preventing its overload by signals in excess of full scale. A software “overload” flag informs the operator if the input signal exceeds a selected threshold. A reset switch is provided to discharge the accumulated charge when using long time constants.

The 6136 provides two modes of charge amplifier calibration. Voltage insertion mode injects dynamic signals through a precision resistor, input cables and transducer verifying the voltage gain and integrity of the input circuit. Charge calibration mode injects dynamic signals through a precision capacitor into the charge input simulating the output of a charge transducer. The voltage input for IEPE transducers has static or dynamic voltage substitution calibration. All static and dynamic calibration signals can be provided by external sources that are easily removed to be sent out for periodic certification.

The IEPE input is for piezoelectric sensors with built-in charge amplifiers. It provides 2 to 20 mA excitation with 26 Volt compliance to the transducer. A voltage amplifier has gains of 1 to 5,000 with 100 kHz bandwidth up to gain 1,000. The voltage amplifier is calibrated by static or dynamic voltage substitution.

The standard low-pass filter is a six-pole Bessel with four programmable bandwidths. An optional 4-pole, Bessel filter has continuously programmable bandwidth from 10 Hz to 20 kHz. A post-filter gain of 10 can be selected. Each channel has a ±10 Volt, 25 mA analog output.