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2 Introduction
The 1502A is a low-cost high-accuracy digital thermometer readout designed to
be used with 25Ω and 100Ω RTDs and SPRTs. Its unique combination of fea
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tures makes it suitable for a wide variety of applications from laboratory mea
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surement to industrial processes. Features of the 1502A include:
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Measures 25Ω and 100Ω RTDs and SPRTs
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Four-wire connection eliminates lead resistance effects
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Accuracy: 0.006°C at 0°C
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Resolution: 0.001°C
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Fast one-second measurement cycle
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Adjustable digital filter
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Accepts ITS-90 characterization coefficients
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Also accepts Callendar-Van Dusen and IPTS-68 coefficients
• Adjustable excitation current
• 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
• Detachable power cord
• Light weight, small and portable
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Sturdy, reliable construction
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2 Introduction