In the field of instrumentation, the core task of a power supply is to convert unstable external input into a stable voltage with extremely low noise required by the device's internal needs, and its performance directly determines measurement accuracy.
Portable and handheld devices (such as multimeters): require low power consumption (quiescent current μA level) and small size, commonly using boost or buck modules.
High-precision desktop devices (such as 6-digit semi-multimeters): demanding noise and ripple (usually < 1mVpp) and excellent linear adjustment rate.
Automated Testing (ATE): System-level power supply. High dynamic response is required to handle sudden load changes, and multiple channels are isolated to prevent interference.
Process control and transmitters (such as 4-20mA two-wire instruments): require ultra-low quiescent power consumption (μA level) and a wide input voltage range.
