The Astronics/EADS/Racal 4072 Resistance Module is a programmable dual-channel resistance module designed for precision calibration, testing, and sensor simulation in VXIbus systems. Each channel provides four decades of resistance selection with 0.01% resolution across ranges from 0.1 Ω to 1 MΩ, delivering accuracy down to ±(0.015% + 200 mΩ) on the standard 4072 model. The module supports independent or paired-channel configuration and operates within a 3 W power dissipation limit, making it suitable for high-accuracy measurement applications and digital control of potentiometric circuits.
## Technical Specifications
• **Channels:** Dual, configurable as one or two independent channels
• **Decades per Channel:** 4
• **Resolution:** 0.01%
• **Resistance Range:** 0.1 Ω to 1 MΩ
• **Accuracy (Model 4072):** ±(0.015% + 200 mΩ)
• **Accuracy (Model 4072A):** ±(0.05% + 200 mΩ)
• **Accuracy (Model 4073):** ±(0.1% + 800 mΩ)
• **Available Ranges:** 0–999.9 Ω (0.1 Ω step), 0–9999 Ω (1 Ω step), 0–99.99 kΩ (10 Ω step), 0–999.9 kΩ (100 Ω step)
• **Input Impedance:** 100 MΩ @ 23°C
• **Maximum Power Dissipation:** 3 W
• **Module Configuration:** Single-slot VXIbus module
## Key Features
• SCPI-compatible programming for automated test integration
• VXIbus trigger capability via TTL trigger lines
• Four-decade resistance selection per channel with fine 0.01% resolution
• Low input impedance loading at 100 MΩ
• Software drivers available for LabWindows/CVI, LabVIEW, and VXI plug-and-play environments
## Typical Applications
• Precision resistance calibration and verification
• Temperature and sensor simulation for test systems
• Digital potentiometer control in process measurement
• High-accuracy current measurement when paired with digital voltmeters
• Industrial control and measurement circuits requiring stable reference resistances
## Compatibility & Integration
The 4072 series integrates directly into VXIbus instrument chassis. SCPI command compatibility enables straightforward integration into automated test sequences. Standard VXI plug-and-play driver support accelerates deployment in LabVIEW and LabWindows/CVI environments.
