The Endevco 4430A is a programmable bridge transducer signal conditioner designed to amplify and condition signals from full, half, or quarter bridge transducers including pressure gages, strain gage potentiometers, and ISOTRON® type accelerometers. The unit delivers isolated, true differential signal processing with extensive front-panel programmability, making it suitable for demanding industrial and laboratory measurement applications.
## Technical Specifications
**Signal Path**
• True differential input with programmable AC or DC coupling
• Maximum input voltage: ±50 V differential, ±300 V common mode (DC or AC peak)
• Input impedance: 50 MΩ minimum (DC coupled); 1 MΩ typical (AC coupled)
• Common mode rejection ratio: 120 dB minimum (DC to 60 Hz at Gain ≥100)
• Isolated output; differential sensor inputs to output isolation 1000 MΩ
**Excitation**
• Isolated, programmable voltage excitation: 0.100 Vdc to 15.000 Vdc (5 mV steps)
• Programmable current: 0.5 mA to 100 mA (0.1 mA steps)
• Supports full, half, or quarter bridge completion
**Amplification**
• Gain range: 1 to 1000 (optional 4430A-1 extends to 10,000)
• Gain accuracy: ±0.1% of setting maximum
• Linearity: ±0.005% of full scale (best fit straight line, DC)
• Gain sensitivity to line voltage: ±0.01% of full scale
• Automatic and manual zeroing to <1 mV RTO
**Filtering**
• 4-pole Butterworth low pass filter: 10 Hz to 10 kHz (5 Hz steps)
• Fixed corner frequency options: 20 kHz, 30 kHz
• Wideband (filters bypassed): DC to 100 kHz (-3 dB minimum)
• AC coupled wideband: 2 Hz to 100 kHz (-3 dB minimum)
**Phase Response**
• Non-inverting: <2° (DC to 1 kHz); <5° (1 kHz to 10 kHz)
**Physical**
• Weight: 3.95 lbs
• Front-panel programming via EDIT, MENU SELECT, LED bar graph, and ENTER keys
• Five-character alphanumeric LCD display
## Key Features
• External calibration input (differential input switchable to calibration voltage)
• High common mode voltage operation: 300 Vdc or AC peak maximum
• ±300 V common mode rejection enables low-noise bridge measurements in high-noise environments
• Maximum 9 conductors supported for flexible transducer configurations
## Typical Applications
• Pressure measurement systems
• Strain gage signal conditioning
• ISOTRON® accelerometer signal processing
• Industrial and laboratory bridge transducer data acquisition
