Rigol MC3120 – 20 channel differential Multiplexer module

The Rigol MC3120 is a 20-channel differential multiplexer module that expands the input channel capacity of Rigol M300 series data acquisition systems. It enables measurement of multiple signals with a single mainframe through automated channel switching and scanning. The module supports both 2-wire and 4-wire measurement configurations, with automatic channel pairing for 4-wire resistance measurements. Break-before-make switching ensures signal integrity in complex test setups.

– Technical Specifications

Channel Configuration
• 20 differential channels organized into two banks (A and B) of 10 two-wire channels each
• 2-wire and 4-wire measurement support; 4-wire mode pairs channel n with channel n+10 automatically
• Scanning speed up to 60 channels/s; open/close speed up to 200 channels/s
• Break-before-make switching action for all scan-listed channels

Electrical Performance
• Voltage isolation: 300 VRMS
• Current handling: 1 ARMS
• Power handling: 50 VA
• Bandwidth: 1 MHz
• 78-pin module interface for mainframe and terminal block connection

Physical
• Dimensions: 17.00″ L × 9.00″ W × 6.00″ H

– Key Features

• Dual-bank architecture with independent 10-channel banks for flexible signal routing
• High switching speed accommodates time-critical measurement sequences
• 4-wire resistance measurement capability with automatic channel pairing eliminates external jumpers
• Multiple channels can be closed simultaneously when not in scan list configuration
• Break-before-make action prevents signal transients and crosstalk

– Typical Applications

• Automated test systems requiring multi-signal acquisition
• Temperature monitoring using thermocouple arrays
• Resistance and impedance measurement in production environments
• Data logging for extended monitoring campaigns
• Environmental chamber testing with distributed sensor networks

– Compatibility & Integration

The MC3120 integrates with Rigol M300 and M301 DAQ system mainframes. External signal connection requires the M3TB20 terminal block, which includes a built-in thermocouple reference junction. The module operates alongside the MC3065 DMM module; ensure signals on the analog bus do not exceed 300 VDC or 300 VRMS. ESD protection during operation and handling is mandatory.