Fluke 1504 2 Introduction

2 Introduction

The 1504 Thermometer Readout is a low-costhigh-accuracy digital thermome-

ter readoutdesigned to be used with thermistors or RTDs with a nominal resis-

tanceof 1 ,000Ωor greater.Its unique combination of features makes it suitable

for a widevariety of applications from laboratory measurement to industrial

processes. Features of the 1504 include:

•Measures with most any thermistor

•Four-wire connection eliminates lead resistance effects

•Accuracy: 0.003°C, typical

•Resolution: 0.0001°C

•Fast one-second measurement cycle

•Adjustable digital filter

•Accepts Steinhart-Hart characterization coefficients

•Also accepts Callendar-VanDusen coefficients

•Auto-ranging from 0Ωto 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

•Detachable power cord

•Optional 12 V DC power

•Light weight, small and portable

•Sturdy, reliable construction

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2 Introduction

Contents

Main Rev. 571202 Table of Contents ii 7.3 Remote Commands . . . . . . . . . . . . . . . . . . . . . . . . . 28 8 Calibration Procedure . . . . . . . . . . . . . . . . . . . . . . 35 Page Page 1 Before You Start 1.1 Symbols Used 1.2 Safety Information 1.2.1 Warnings Page 1.2.2 Cautions 1.3 Authorized Service Centers Page 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 4.4 DC Power Option + Page 5 Parts and Controls 5.1 Front Panel Buttons 84.9814 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 6.4.1 Setting the Probe Characterization Type Pr= thr Pr= rtd 6.4.2 Setting the Characterization Coefficients b0 +4.336079 E -04 6.4.3 Steinhart-Hart Characterization () [] 6.4.4 Callendar-Van Dusen (RTD) Conversion The RTDconversion uses the Callendar-VanDusen equation: [] ()() () 6.4.5 Testing the coefficients 6.5 Filtering Page 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 29 7 Digital Communications Interface Remote Commands Table 5 Command List , n 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 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)