Keithley / MetraByte MB31-02 Voltage Input SCM

The Keithley/MetraByte MB31-02 is a voltage input signal conditioning module (SCM) engineered for precision voltage measurement in industrial and laboratory data acquisition systems. This module delivers -5V to +5V input and output ranges with calibrated accuracy of ±0.05% span ±10 µV RTI ±0.05 Vz, supported by laser-trimmed circuitry and chopper-stabilized amplification for exceptional long-term stability.

## Technical Specifications

• **Input/Output Range:** -5V to +5V
• **Calibrated Accuracy:** ±0.05% span ±10 µV RTI ±0.05 Vz
• **Common Mode Rejection:** 160 dB
• **Normal Mode Rejection:** 90 dB
• **Signal Isolation:** 1500 Vrms transformer isolation (signal and power sections)
• **RFI/EMI Immunity:** High
• **Weight:** 70 g (MB31)

## Key Features

• Transformer isolation eliminates ground loops, guards against transients, and prevents common-mode voltage problems
• Chopper-stabilized amplification minimizes drift without requiring manual adjustment
• Laser-trimmed for high calibrated accuracy
• Integrated filtering and amplification conditioning
• Identical pin-out and size across MB Series modules enable seamless integration and module interchangeability

## Typical Applications

• Industrial voltage measurement systems requiring high rejection of common-mode and normal-mode noise
• Laboratory data acquisition platforms where long-term stability and low drift are critical
• Ground-isolated measurement channels in multi-channel test environments
• Systems operating in high-EMI environments

## Compatibility & Integration

The MB31-02 integrates into Keithley MetraByte MB Series backplane systems. Standardized pin-out and form factor allow mixing with other MB Series modules without modification. Installation is rated for IEC 60664 Installation Category I sources; avoid direct connection to mains or high-transient sources.