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
-
tures makes it suitable for a wide variety of applications from laboratory mea
-
surement to industrial processes. Features of the 1502A include:
•
Measures 25Ω and 100Ω RTDs and SPRTs
•
Four-wire connection eliminates lead resistance effects
•
Accuracy: 0.006°C at 0°C
•
Resolution: 0.001°C
•
Fast one-second measurement cycle
•
Adjustable digital filter
•
Accepts ITS-90 characterization coefficients
•
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
•
Sturdy, reliable construction
7
2 Introduction
