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2 Introduction
The 1504 Thermometer Readout is a low-cost high-accuracy digital thermome
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ter readout designed to be used with thermistors or RTDs with a nominal resis
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tance of 1,000Ω or greater. Its unique combination of features makes it suitable
for a wide variety of applications from laboratory measurement to industrial
processes. Features of the 1504 include:
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Measures with most any thermistor
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Four-wire connection eliminates lead resistance effects
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Accuracy: 0.003°C, typical
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Resolution: 0.0001°C
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Fast one-second measurement cycle
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Adjustable digital filter
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Accepts Steinhart-Hart characterization coefficients
• Also accepts Callendar-Van Dusen coefficients
• Auto-ranging from 0Ω to 1 MΩ
• Excitation current adjusts automatically to minimize self-heating
• Displays temperature in Celsius, Fahrenheit, or Kelvin or displays resis-
tance in ohms
• Password protection of critical parameters
• Large, bright eight-digit LED display
• Serial RS-232 interface standard; IEEE-488 GPIB interface optional
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Detachable power cord
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Optional 12 V DC power
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Light weight, small and portable
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Sturdy, reliable construction
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2 Introduction