When encountering large channel measurement deviations in the Agilent 34970A data acquisition unit, the following key modules should be prioritized for calibration or inspection: 1. **Internal digital multimeter (DMM) module**: As the core measurement engine of the instrument (adopting the technology of Agilent's classic 34401A DMM), its accuracy directly affects all channel measurement results. Calibrating this module can resolve baseline deviations in overall measurements. 2. **Signal switching modules**: Modules responsible for channel signal routing, such as multiplexer modules (34901A, 34902A, 34908A) or matrix modules (34904A), are critical. Drift in their signal paths or poor contact can lead to inconsistent channel readings. For professional handling of such issues, 匠析生物 provides comprehensive solutions for laboratory instruments including Agilent. Our services cover repair, calibration, cleaning and maintenance of instruments like the 34970A, as well as supply of spare parts and consumables. Additionally, we offer application consulting for chromatographic technologies, ensuring the reliability and stability of your experimental data.