The difference between the two models: basically the same function, high precision of the large board and better stability High-precision microvolt/millivoltage amplifier small signal instrumentation amplifier AD620 transmitter The AD620 is used as the main amplifier, which can amplify microvolt and millivolt voltages. Magnification is 1.5-10000 times, adjustable. High accuracy, low offset, and better linearity. Adjustable zeros to improve accuracy. Can be used for ac and DC models. High-precision, low offset, AC, DC microvoltage, millivolt voltage amplifier, can be used for small signal amplification of AC and DC, microvoltage, millivolt voltage amplification. (The use of modules requires a certain electronic foundation. If there is no basic customer, please purchase with caution. This store does not provide technical support.) Product Highlights: 1: Wide input range This product uses AD620 to amplify, which can amplify microvolts and millivolts, which is better than on the market. The LM358 has high amplification accuracy and good linearity, and the maximum voltage output range is 10V. 2: Amplification factor: Use potentiometer to amplify the input signal, and the amplification factor is up to 1000 times. It only needs to be adjusted through a potentiometer. 3: Adjustable zero point Adjust the zero point through the zero potentiometer to improve the accuracy, and there will be no zero point drift, meeting customer needs. 4: Negative voltage output The module uses a 7660A negative voltage chip to output negative voltage (-Vin), which can be provided to customers to drive other dual power loads. 5: Mini type: 32*22mm, with 4 3mm positioning holes evenly distributed around, and the array on both sides is 2.54mm standard spacing. Product parameters: 1. Input voltage: 3-12VDC. (Batch customization) 2. Magnification: 1.5-1000 times adjustable, zero point adjustable 3. Signal input voltage: 100uV--300mV 4. Signal output range: ±(Vin-2V) 5. Negative pressure output: greater than -Vin. Due to the problem of internal resistance of negative voltage chip output, the actual output is greater than -Vin, the greater the load power, the greater the negative voltage drop. 6. Offset voltage: 50μV. 7. Input bias current: 1.0nA (maximum value). 8. Common mode rejection ratio: 100dB 9. Offset voltage drift: 0.6μV/℃ (maximum value). 10. Stable, time: 2μV/month maximum 11. Module weight: 4g 12. Size: 32*22mm