Vishay Measurements 2311 Signal Conditioning Amplifier

The Vishay Measurements 2311 Signal Conditioning Amplifier processes weak electrical signals from strain gauges, transducers, and temperature sensors with continuously variable gain from 1 to 11,000. This module delivers precise amplification, filtering, and signal conversion for data acquisition in industrial and laboratory test environments. It combines high linearity (±0.02% DC), ultra-low noise (1 microvolt p-p RTI at 0.01–10 Hz), and excellent gain stability (±2 microvolts/°C RTI maximum) to support demanding measurement applications.

– Technical Specifications

Signal Conditioning
• Gain: 1 to 11,000 (ten-turn knob X1 to X11, decade multiplier X1 to X1000)
• Linearity (DC): ±0.02%
• Stability (Gain over X100): ±2 microvolts/°C maximum RTI
• Noise (Gain over X100): 1 microvolt p-p RTI (0.01–10 Hz); 5 microvolts rms maximum RTI (0.5 Hz–125 kHz)
• Input Impedance: 100 megohms minimum (differential and common-mode)
• Bias Current: ±50 nA typical per input
• Source Impedance: 0 to 1000 ohms

Excitation Source
• Voltage Settings: 12 selectable outputs—variable 0.4 to 6 Vdc, fixed 0.7, 1, 1.4, 2, 2.7, 3.5, 5, 7, 10, 12, 15 Vdc (±1% maximum)
• Current: 0–100 mA, limited at 175 mA maximum
• Regulation (0–100 mA, ±10% line change): ±0.5 mV ±0.04% maximum at remote sense
• Remote Sense Error: 0.0005% per ohm of lead resistance (350-ohm load)

Filtering
• Type: 2-pole Butterworth low-pass active filter
• Selectable Frequencies (-3 dB ±1 dB): 10, 100, 1000, 10,000 Hz, or wide-band
• Output Filtering: Switch-selectable per output

Frequency Response
• DC Coupled: DC to 50 kHz (-0.5 dB max); DC to 125 kHz (-3 dB max)
• AC Coupled: 1.7 Hz to 125 kHz (-3 dB max)
• Reduced Output (2 Vrms max): 200 kHz (Gain 1–11); 170 kHz (Gain 10–110); 135 kHz (Gain 100–1100); 125 kHz (Gain 1000–11,000)

– Key Features

• Bridge excitation with 12 voltage settings and variable range
• Quarter-, half-, and full-bridge strain gauge configurations (50–1000 ohms)
• Installed dummy resistors for bridge completion
• Remote sense capability for lead resistance compensation
• Switchable filtering on PC board for independent output control

– Compatibility & Integration

Sensor Types
• Foil and piezoresistive strain gauges (all bridge configurations)
• Potentiometers and DCDT displacement transducers
• Thermocouples, RTDs, and nickel temperature sensors

Input Source
• Impedance tolerance: 0 to 1000 ohms