1ch Strain Gauge Amplifier
The WPC Strain Gauge Amplifier (SGA) is a high-bandwidth signal amplification front-end module specifically designed for strain gauge measurements. It accurately amplifies the minute voltage variation signals generated by strain gauges into standard voltage outputs, localized for high-frequency strain and structural stress analysis through general analog input channels.
Key Features
- High-Ratio Precision Amplification: Provides a fixed 1000x gain (Gain), boosting microscopic strain signals into the measurement range.
- High-Bandwidth Measurement Capability: Features a bandwidth of up to 300KHz, suitable for high-speed dynamic strain and shockwave observation.
- Dedicated Excitation Voltage: Built-in stable 2V excitation voltage (Excitation voltage), optimizing the performance of 1/4 bridge sensors.
- High Electrical Isolation: Power and signal feature internal isolation design, ensuring measurement accuracy and reducing ground loop interference.
- 1/4 Bridge Support: Specifically designed for 120 ohms 1/4 bridge strain gauge architectures.
Product Specifications and Features
The WPC SGA delivers outstanding performance for high-frequency strain measurement applications. Its main specifications are as follows:
- Power Input: 24 VDC
- Gain: 1000
- Excitation Voltage: 2 V
- Output Voltage Range: ±2 V
- Bandwidth: 300 KHz
- Base Noise: Approx. 50 mV (at full bandwidth)
- Sensor Type: 1/4 bridge, 120 ohms
- Isolation Design: Internal isolation between power and signal (0V is not connected to AGND)
Pinout and Hardware Interface
Below is the detailed pinout configuration for the WPC SGA:
| Pin Number | Label | Function Description |
|---|---|---|
| 1 | Sensor- | Connects to strain gauge (Load end -) |
| 2 | Sensor+ | Connects to strain gauge (Load end +) |
| 3 | AGND | Signal Ground |
| 4 | Vout | Signal Output |
| 5 | Vtune | Offset adjustment reference (can be used for external compensation) |
| 6 | 24V | Positive Power Input (24Vin) |
| 7 | 0V | Power Ground |
| VR | Offset | Offset adjustment resistor (Clockwise to increase offset) |
System Connection and Applications
Connection Diagram
Correctly connect the strain gauge to Sensor+ and Sensor- to start measurements.
Application with NI Data Acquisition Equipment
This module can be quickly integrated with common DAQ equipment (such as NI-6009 or NI-6363). Through the Vtune pin, users can accurately observe or adjust the zero-point offset.
Linear Relationship between V-tune and Offset (V-tune vs. Offset)
The table below displays the typical correlation for achieving offset compensation through Vtune calibration:
| Vtune Adjustment Value | Resulting Offset Level |
|---|---|
| ±10 mV | ±190 mV |
Advanced Testing and Performance
Noise Evaluation
At full bandwidth of 300kHz, the noise level of the SGA is approximately 60mV.
Dimensional Drawing
