Charge Amplifiers

Boost the accuracy of your vibration and signal analysis with MTI Instruments’ differential charge amplifiers engineered to deliver unmatched reliability, signal integrity, and noise immunity in demanding test environments. Whether you’re balancing gas turbines, analyzing engine vibration, or measuring structural motion, our charge amplifiers transform charge-mode accelerometer signals from piezoelectric sensors into clean, stable voltage signals optimized for high-speed diagnostics and monitoring.

Designed for both industrial and aerospace applications, MTI’s accelerometer charge amplifiers deliver flexible configurations, seamless system integration, and rugged performance—ensuring your piezoelectric sensors produce accurate, interference-free data without distortion, delay, or signal degradation. Perfect for vibration testing, charge-mode signal conversion, and dynamic structural analysis, these amplifiers provide the precision and durability trusted in mission-critical environments.

CA1800: Rack-mount Multiple Channel Charge Amplifier

41CA: Dual Channel Rugged Charge Amplifier

55CA: Single Channel Rugged Charge Amplifier

Why Choose MTI Instruments Charge Amplifiers?

Convert Charge to Voltage with Confidence

  • Seamlessly convert signals from piezoelectric  charge- mode  accelerometers into buffered voltage outputs—eliminating noise and maximizing signal clarity.
  • Gain stable, integrated velocity and acceleration outputs for real-time analysis, even in electrically noisy or high-vibration environments.

Superior Compatibility & Flexibility

  • Choose from single-channel, dual-channel, or multi-channel configurations—engineered to support your application size and complexity.
  • Configure gain, filter settings, and signal output types at the factory—tailored to match your sensor sensitivity and test conditions.
  • Support for both single-ended and differential inputs/outputs, ensuring integration with any setup.

Rugged and Reliable for Harsh Test Environments

  • Built for high temperatures, shock, and vibration—MTI charge amplifiers stand up to the most extreme engine test cells and field environments.
  • Compact and mountable designs with DIN rail, flange, and rack-mount options for seamless installation.

FAQ’s

A charge amplifier is a precision signal conditioning device that processes the high-impedance charge output from a piezoelectric sensor or accelerometer. It amplifies the signal and converts it to a usable low-impedance voltage signal for data acquisition systems, condition monitoring, or vibration analysis.

A Differential Charge Amplifier is the correct technical term for a device that converts high-impedance charge signals from piezoelectric sensors into low-impedance voltage signals. It includes amplification, signal filtering, and often integration to produce both acceleration and velocity outputs. The term Differential Charge Converter is non-standard and may create confusion, as it lacks the specificity and functionality conveyed by amplifier. MTI Instruments’ 55CA and CA1800 are true Differential Charge Amplifiers designed for precision signal conditioning in test environments.

MTI’s amplifiers work with charge-mode piezoelectric sensors, including:
• Piezoelectric accelerometers
• Vibration sensors
• Dynamic pressure transducers
These sensors generate high-impedance charge signals that MTI’s amplifiers convert into usable differential or single-ended voltage outputs.

MTI charge amplifiers typically offer configurable gain settings such as 1, 4, or 10 mV/pC, allowing users to match the amplifier to the sensitivity of their piezoelectric sensor.

Yes. Most MTI Differential Charge Amplifiers, such as the 55CA and CA1800, provide both a buffered acceleration output and an integrated velocity output. This dual-output configuration supports a wide range of vibration analysis and machinery diagnostic applications.

Absolutely. MTI’s amplifiers are designed for seamless integration with:
• Data acquisition systems (DAQs)
• Vibration analyzers
• PBS-4100 series portable balancing systems

They support both differential and single-ended outputs, and offer various mounting styles, including DIN rail, flange mount, and rack-mount configurations (e.g., CA1800 supports 4 to 8 channels in a 19″ rack-mount chassis).

Consider the following:
• Number of channels: Single (55CA), Dual (8000-4225), or Multi-channel (CA1800)
• Gain and filter requirements
• Signal output type (acceleration, velocity, or both)
• Mounting environment (field, engine bay, or control room)
• Power supply needs: MTI amplifiers support ±12 VDC, 20–30 VDC, or 110–240 VAC depending on model

Our applications engineers can assist you in configuring the ideal Differential Charge Amplifier system based on your specific sensor and measurement requirements.