The IET Labs Inc 2PRS-F-4-1-2IEEE-2D-RM is a programmable resistance substitution unit engineered for precision calibration and metrology. It delivers stable, traceable resistance values across a wide range with ±(0.05% + 15 mΩ) accuracy after zero subtraction, meeting stringent IEEE specifications. The instrument combines local front-panel thumbwheel control with remote IEEE-488.2 operation for seamless integration into automated test systems.
## Technical Specifications
• **Resistance Range:** 0 to 99,999,999.9 Ω in 0.1 Ω increments
• **Accuracy:** ±(0.05% + 15 mΩ) after zero resistance subtraction, 4-terminal “true-ohm” measurement at 23 °C, SI-traceable
• **Zero Resistance:** <140 mΩ typical <100 mΩ; <25 mΩ with SC (Short Circuit) option; +20 mΩ if OC (Open Circuit) option present
• **Maximum Load:** 3 A or 200 V (dc + ac peak) or 0.5 W/step or 4.5 W maximum (whichever applies first)
• **Resistance Elements:** Low-inductance wirewound resistors hermetically sealed (1 Ω to 100 kΩ); precious metal-oxide film resistors (1 MΩ and above); resistance wire steps below 0.1 Ω
• **Relay Contacts:** Low thermal EMF gold-clad silver-alloy contacts
• **Power Supply:** 110–250 V, 50–60 Hz; 0.5 A fuse (5×20 mm)
• **Thermal EMF:** Low-EMF relays employed; copper wire and copper alloys recommended for connections handling microvolts
## Key Features
• Four gold-plated tellurium-copper binding posts (HI/LO CURRENT and SENSE pairs) plus chassis GND post
• LOCAL/REMOTE front-panel switch for operational mode selection
• Hardware or software configurable GPIB addressing (0–30)
• Supports *IDN and CAL:DATE? SCPI 1994.0 commands
• 19" rack-mount configuration; 4.5 kg (10 lb)
• Optional OC mode for reproducible break-before-make transitions; optional SC mode for reduced zero resistance
## Compatibility & Integration
Conforms to IEEE STD 488.2 with 24-pin GPIB connector. Supports IEEE-488.2-1987 and SCPI 1994.0 command sets, enabling direct integration with test automation platforms and instrument control frameworks.
