Fluke 1502A 2 Introduction

2 Introduction

The 1502A is a low-costhigh-accuracy digital thermometer readout designed to

be used with25Ωand 100ΩRTDs and SPRTs. Its unique combination of fea-

tures makes it suitable for a wide variety of applications from laboratory mea-

surement to industrialprocesses. Features of the 1502A include:

•Measures 25Ωand 100ΩRTDsand 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-VanDusen 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

Contents

Main Rev. 722101 Table of Contents 7 Digital Communications Interface . . . . . . . . . . . . . . . 23 ii 7.3 Remote Commands . . . . . . . . . . . . . . . . . . . . . . . . . 26 8 Calibration Procedure . . . . . . . . . . . . . . . . . . . . . . 35 Page Page 1 Before You Start 1.1 Symbols Used 1.2 Safety Information 1.2.1 Warnings 1.2.2 Cautions 1.3 Authorized Service Centers Page 2 Introduction 3 Specifications and Environmental Conditions 3.1 Specifications 9 3 Specifications and Environmental Conditions Specifications 3.2 Environmental Conditions 4 Quick Start 4.1 Unpacking 4.2 Power 4.3 Connecting the Probe Page 5 Parts and Controls 5.1 Front Panel Buttons 84.981 C 5.2 Rear Panel l 6 General Operation 6.1 Selecting Units 6.2 Parameter Menus 6.3 Menu Lockout Page 6.4 Selecting the Probe Characterization E -04 6.4.3 ITS-90 PRT and Coefficients Page [] () [] 6.4.4 Callendar-VanDusen (RTD) Conversion The RTDconversion uses the Callendar-VanDusen equation: 6.4.5 IPTS-68 Conversion A4 +4.336079 E -04 6.5 Filtering 6.6 Setting the Current 6.7 Power Saver 7 Digital Communications Interface 7.1 Serial Interface 7.1.1 Setting the Baud Rate 7.1.2 Automatic Transmission of Measurements 7.1.3 Time Stamp and System Clock 7.1.4 Duplex Mode and Linefeed 7.2 GPIB Interface 7.2.1 Setting the Address 7.2.2 Setting the Termination Character 7.2.3 Time Stamp 7.3 Remote Commands 7.3.1 Measurement Commands 27 7 Digital Communications Interface Remote Commands Table 6 Command List Page 7.3.2 Probe Characterization Commands 7.3.3 Sample Commands 7.3.4 Communication Commands 7.3.5 Calibration Commands 7.3.6 Other Commands Page 8 Calibration Procedure 8.1 Accessing the Calibration Parameters 8.2 Calibration Procedure 9 Maintenance 10 Troubleshooting 10.1 CE Comments 10.1.1 EMC Directive 10.1.2 Low Voltage Directive (Safety)