Fluke 1521 2 Introduction

2 Introduction

The 1521 Handheld Thermometer Readoutis a low-cost, high-accuracy digital

thermometer readoutdesigned to be used with PRTs and thermistors. The

uniquecombination of f eaturesmakes this instrument suitable for a wide vari-

ety of applications in industry.Features and capabilities of the 1521 include the

following:

•Measures with platinum resistance thermometers (PRTs) and thermistors

•Works with Hart’s special INFO-CON probe connector (which is partially

based on U.S. Patent 5,857,777) to automatically recognize the type of

sensor and its characteristics

•Automatically alerts the operator when the probe calibration or meter cal-

ibration expires

•Measures with an accuracy of ±0.025°C at 25°C with PRTsand ±0.005°C

at 25°C with thermistors

•Accepts three- or four-wire sensors to eliminate lead resistance errors

•Is immune to thermoelectric EMF

•Measures with a fast one-second measurement cycle

•Displays maximum, minimum, and delta temperatures

•Stores up to six measurements in memory

•Uses a unique factory-assigned pass-code to protect programmed settings

•Displays measurements and settings on a high-contrast LCD display

•Communicates with other equipment using an RS-232 serial interface

•Can be powered from its AC adapter or rechargeable battery

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2 Introduction

Contents

Main Rev. 571203 Table of Contents 7 Display Functions. . . . . . . . . . . . . . . . . . . . . . . . . 25 8 Communications Interface. . . . . . . . . . . . . . . . . . . . 37 9 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 10 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Page Figures and Tables 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 Use Proper Care with the 1521 and Accessories 4.3 Learn About the Features and Components 4.4 Connect the Probe 4.5 Connect the Power Source 4.6 Switch the Power On 4.7 Measure Temperature Page Page 5.2 Top and Side Features 5.3 Back Features 5.4 Internal Features 5.5 Accessories Page 6 General Operation 6.1 Battery 6.2 DC Power Source + 6.3 Power Button 6.4 Display and Backlight 6.5 Probe 6.6 INFO-CON Connector 1521 Handheld Thermometer Readout Figure6 Probe Wiring Diagrams 24 7 Display Functions Each of these operating modes is described in the sections that follow. 7.1 Blank Mode This mode is identified by Blank that temporarily appears on the display. 7.2 Min/Max Mode 7.3 Hold Mode 7.4 Delta(x) Mode 7.5 Units 7.6 Rate 7.7 Resolution 7.8 CAL MODE 7.8.1 Mtr Due 7.8.2 Prb Due 7.8.3 Time 7.8.4 Passcode 7.8.5 Date 7.8.6 Probe Lock 7.8.7 Prb # 7.8.8 Prb Type 7.8.9 ITS-90 7.8.10 IEC751 7.8.11 CVD 7.8.12 YSI-400 7.8.13 THERM 7.8.14 Probe Wires 7.8.15 PCal 7.8.16 PDue 7.8.17 Filter 7.8.18 MCal 7.8.19 MDue 7.8.20 CAL1 and CAL2 8 Communications Interface 8.1 RS-232 Connection 8.2 Communication Command List 8.2.1 Primary Commands 8.2.2 Calibration Commands 39 8 Communications Interface Communication Command List Page Page 9 Calibration 9.1 Required Equipment 9.2 Calibration Procedure Page 10 Maintenance 11 Troubleshooting 11.1 An Error Message Is Displayed The followingtable lists possible error messages, their causes, and suggested actions. 47 11 Troubleshooting An Error Message Is Displayed 11.2 CE Comments 11.2.1 EMC Directive 11.2.2 Low Voltage Directive (Safety)