Isolated vs Non-Isolated Multi-Channel DC Meter

In multi-channel DC measurement systems, dual-channel DC meters are generally classified into:

-. Non-Isolated Dual-Channel DC Meter
-. Isolated Dual-Channel DC Meter

The two architectures differ significantly in hardware structure, anti-interference capability, safety, and application scenarios. In practical applications, the selection should be comprehensively evaluated based on system grounding method, common-mode voltage level, and on-site electromagnetic environment.

Non-Isolated Architecture

Working Principle:

-. All channels share the same positive and negative power supply
-. All measurement channels share the same reference ground (GND)
-. No electrical isolation between Channel-I and Channel-II
-. Channels are logically independent only

Advantages:

-. Simple circuit architecture
-. Low BOM cost
-. Small PCB footprint
-. Good channel synchronization
-. Lower power consumption

Typical Applications:

-. Low-voltage DC systems
-. Common-ground battery systems
-. Telecom power monitoring
-. Small-scale energy storage equipment
-. Series-connected battery string monitoring
-. DC distribution systems with common busbar

Isolated Architecture

Working Principle:

-. Each channel has an independent reference ground
-. Electrical isolation between Channel-I and Channel-II
-. No direct electrical connection between bus-I and bus-II
-. Typically implemented using isolated ADCs / isolation amplifiers / digital isolators / isolated DC/DC power supplies

Advantages:

-. Complete electrical isolation between channels
-. Strong common-mode interference immunity
-. Capable of withstanding high common-mode voltage
-. Higher safety level
-. Reduced risk of ground loop formation
-. Suitable for complex industrial environments

Typical Applications:

-. Energy storage battery packs (Battery Pack)
-. EV charging systems
-. PV energy storage systems
-. High-voltage DC systems
-. Industrial floating-ground systems
-. Multi-loop monitoring in BMS systems
-. High-voltage floating measurement applications