KYOWA WGI 300B-1 JAPAN USED INSTRUMENTATION AMPLIFIER 16:41

The KYOWA WGI-300B-1 is a precision Instrumentation Amplifier manufactured by KYOWA Electronic Instruments Co., Ltd., a renowned Japanese company specializing in precision measurement equipment, including strain gauges, sensors, and signal conditioning electronics.

This unit is a critical component in data acquisition and measurement systems. Its primary function is to amplify a very small differential voltage signal (often from a sensor like a strain gauge, load cell, or thermocouple) while rejecting any common-mode noise (interference that appears on both signal wires). This makes the signal stronger, cleaner, and suitable for processing by a data logger, oscilloscope, or analog-to-digital converter (ADC).

The “USED” designation indicates this is a previously owned unit, likely sourced from surplus or decommissioned industrial or research equipment.

Key Specifications (General for WGI-300 Series)

• Manufacturer: KYOWA (Japan)

• Model: WGI-300B-1 (This specific variant indicates certain factory-set parameters like gain range and filter settings).

• Type: Instrumentation Amplifier (Conditioning Amplifier)

• Condition: USED

• Country of Origin: Japan

Key Features and Functions

• High-Gain, Low-Noise Amplification: Designed to accurately amplify very weak millivolt (mV) signals from sensors without adding significant electrical noise.

• Excellent Common-Mode Rejection Ratio (CMRR): This is its most important feature. It effectively cancels out noise interference that is common to both input lines, which is crucial for accurate measurements in electrically noisy industrial environments.

• High Input Impedance: Draws minimal current from the sensor source, preventing the amplifier from “loading” the sensor and affecting the measurement accuracy.

• Adjustable Parameters (Typical for such units):

  • Gain: The amplification factor is often selectable via DIP switches or a rotary switch on the unit (e.g., x10, x100, x1000).

  • Filtering: Includes low-pass filters to remove high-frequency noise from the signal.

  • Excitation Voltage: May provide a stable DC voltage or AC carrier signal to power the connected sensor (e.g., a strain gauge bridge).

• Bridge Completion: Often includes resistors to complete a Wheatstone bridge circuit for strain gauge-based sensors.

• Rack-Mountable Design: The WGI-300 series units are typically designed to be mounted in a standard 19-inch equipment rack, making them ideal for permanent test bench or laboratory setups.

Common Applications

This amplifier was used in precision measurement and testing scenarios, such as:

• Structural Testing: Measuring stress and strain on beams, frames, and materials using strain gauges.

• Vibration Analysis: Conditioning signals from accelerometers.

• Force Measurement: Used with load cells in research, development, and quality control.

• Automotive and Aerospace Testing: Data acquisition from various sensors during component and full-scale testing.

• University and Research Laboratories: General-purpose signal conditioning for physics and engineering experiments.

Important Notes for Potential Use

1. Not a General-Purpose Amplifier: This is a highly specialized, precision instrument for measurement applications. It is not suitable for audio or general electronic projects.

2. Manual Required: To use this unit effectively, you must find the official KYOWA WGI-300 series operation manual. The manual is essential to understand:

   • The meaning of the “B-1” suffix and its factory configuration.

   • The pinout of the input and output connectors.

   • How to set the gain, filters, and excitation voltage.

   • Calibration procedures.

3. Verified Functionality: As a used unit, its functionality should be verified before reliance on its measurements. Components like potentiometers for calibration can degrade over time.

4. Power Requirements: It will require specific AC or DC power supplies, details of which will be in the manual.

5. Obsolescence: This is a legacy piece of equipment. While often very well-built, finding technical support or repair services may be difficult.