The Keithley 580 Micro-ohmmeter is a precision instrument for accurate low-resistance measurements from 200 mΩ to 200 kΩ across seven selectable ranges. It employs four-terminal Kelvin sensing to eliminate lead resistance errors, delivering 10 µΩ resolution on the lowest range and accuracy to ±0.05% of reading + 0.1 µΩ. The microprocessor-based design supports selectable pulsed or DC test current from 10 mA to 10 A, with polarity selection and automatic thermal offset cancellation in pulsed mode. A dry circuit test function limits test voltage to 20 mV on sensitive contact junctions. Auto or manual ranging completes in 200 ms per range change, with settling time under 1 second and 3 readings per second conversion rate. The instrument displays results on a 4½ digit ±20,000 count LCD and tolerates 30V rms common mode voltage. Optional interfaces include the Model 5802 for isolated analog output and IEEE-488 control, or the Model 1755 for digital calibration via GPIB.
Technical Specifications
• Measurement Ranges: 200 mΩ to 200 kΩ (seven ranges)
• Resolution: 10 µΩ minimum
• Accuracy: ±0.05% of reading + 0.1 µΩ
• Test Current: 10 mA to 10 A at ±0.2% of reading + 0.02 mA
• Test Voltage: 20 mV (dry circuit); 1 V (standard)
• Settling Time: <1 second to within 10 counts
• Conversion Rate: 3 readings/second typical
• Ranging: Auto (200 ms) or manual
• Display: 4½ digit LCD, ±20,000 counts
• Maximum Input Overload: 10 V limited to 10 A
• Common Mode Voltage: 30 V rms at DC, 50–60 Hz
• Temperature Coefficient: ±(0.1 × accuracy)/°C from 0–18 °C and 28–50 °C
• Power Supply: 105–125 V or 210–250 V, 50–60 Hz, 12 VA
• Dimensions: 89 mm H × 241 mm W × 300 mm D
• Weight: 3.2 kg
– Key Features
• Four-terminal Kelvin sensing eliminates lead resistance errors
• Selectable pulsed or DC source current with automatic thermal offset cancellation
• Dry circuit test protects sensitive contact junctions at ≤20 mV
• Positive or negative polarity selection
• Optional battery pack (Model 1978) for ~6 hours operation
– Typical Applications
• Component evaluation and material resistance characterization
• Quality control testing of low-resistance connections
• Contact resistance assessment in sensitive circuits
– Compatibility & Integration
• Model 5802: Isolated analog output (1 V = 10,000 counts at ×1 gain) and IEEE-488 interface; ±(0.25% of reading + 2 mV) analog accuracy; 1000 Ω output impedance; maximum ±4 V output
• Model 1755: Digital calibration interface via IEEE-488 controller
• Rear panel banana jack connectors for measurement and external trigger inputs
