The Fluke Hart Scientific 1590 Super Thermometer II is a precision resistance thermometer readout instrument engineered for metrology, calibration, and laboratory applications requiring exceptional accuracy. It measures resistance across 0 Ω to 500 kΩ with 1 ppm accuracy when paired with standard platinum resistance thermometers (SPRTs) and 0.00025°C temperature resolution. The instrument supports RTDs, PRTs, SPRTs, HTPRTs, and thermistors, with measurement cycles as fast as 2 seconds and a programmable current source spanning 0.001 mA to 20 mA.
– Technical Specifications
• Accuracy: 1 ppm with SPRT; 0.00025°C with SPRT; 0.000125°C with standards-quality thermistor
• Resistance measurement range: 0 Ω to 500 kΩ
• Internal reference resistors: 1 Ω, 10 Ω, 100 Ω, 10 kΩ
• Resolution: 10 ppm at 0.25 Ω; 5 ppm at 2.5 Ω; 1 ppm at 25 Ω and 100 Ω; 3 ppm at 10 kΩ
• Minimum measurement period: 2 seconds
• Programmable current source: 0.001 mA to 20 mA
• Temperature algorithm: ITS-90
• Display: Color LCD with CCFT backlight
• Power supply: 100–125 Vac / 200–250 Vac (user switchable), 50/60 Hz, 1 A
• Dimensions: 178 mm (H) × 516 mm (W) × 320 mm (D)
• Weight: 16 kg
– Key Features
• Automated data logging to 3.5-inch disk drive in ASCII format
• Analog output: −5 V to +5 V
• Communications: Serial, IEEE-488, and printer output
• Gold-plated Hart DWF connectors for sensor interfaces
• LogWare software compatibility for data management
– Compatibility & Integration
Works with the 2590 ‘Mighty Mux II’ multiplexer, offering 10 channels per unit with cascade capability up to 5 units (50 channels total). Multiplexer features include 4-wire plug floating guard connectors, low thermal EMF hermetically sealed relays with magnetic shielding, 1 × 10¹² Ω isolation between relay legs, 20 mA active channel current capability, and manual or automatic channel selection.
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