The Endevco 2775A is a low-noise signal conditioner engineered to process outputs from piezoelectric, ISOTRON®, and remote charge converter transducers in dynamic testing environments. It delivers selectable AC, Servo, and DC outputs with instantaneous recovery across a wide input charge range, making it suitable for vibration analysis, pressure measurement, and precision sensor signal amplification requiring integrated filtering and gain control.
Technical Specifications
Input Channels
• Piezoelectric (PE): Single-ended configuration; accepts 3,000–110,000 pC maximum depending on gain; compatible with accelerometers spanning 0.1–1099 pC/g
• ISOTRON®: Single-ended; constant current excitation 0.5–20 mA DC (factory set 4 mA); 21 V maximum compliance voltage (AC + DC)
• Grounded or isolated input modes available; isolated mode provides minimum 50 MΩ shunt resistance with maximum 600 pF capacitance; 6 V pk common-mode maximum for full specification compliance; 500 V pk absolute maximum without damage
• Test input: Transformer-coupled signal insertion capability
• External calibration input: 1000 pF ± 0.5% internal capacitor
Output Channels
• AC output: 1–10 V pk adjustable (linear to 12 V pk, factory set 10 V pk); 85 mA pk maximum; DC offset ≤ 20 mV (< 5 mV typical); capacitive load drive capable
• DC output: Peak-average coupled to AC output; 10 VDC full scale; 3 mA DC maximum
• Servo output: Selectable 10 mV/g or 100 mV/g sensitivity via internal jumper; 12 V pk maximum linear output 1–20 kHz; 3 mA pk maximum
• All outputs short-circuit protected, single-ended configuration
– Key Features
• Wide dynamic range, low-noise architecture
• Multi-input transducer compatibility (PE, ISOTRON, RCC)
• Selectable output modes (AC, DC, Servo) for diverse measurement requirements
• Isolated or grounded input configuration options
• Internal calibration signal injection capability
– Typical Applications
• Vibration analysis and measurement
• Pressure transducer signal conditioning
• Dynamic test environments requiring precise amplification and filtering
• Systems requiring X-Y plotter or strip chart recorder integration
– Compatibility & Integration
Accepts piezoelectric accelerometers, ISOTRON integral-electronics transducers, and remote charge converter preamplifiers. Output impedance and drive specifications support connection to analog recording and analysis instrumentation.
