Fluke 1521 +,

adapter supplied with the instrument. The DC power source plugs into the DC

powerinput on the right side of the 1521.

WARNING:The AC adapter has circuits with high voltages inside that

could present danger of electric shock or fire if exposed. If the AC adapter

is damaged in any way or becomes hot, discontinue its use immediately,

disconnect it from any AC supply, and have it replaced. Do not attempt to

open, repair, or continue using a damaged or defective AC adapter.

6.3 Power Button

The powerbutton controls power to the instrument and operates the backlight.

The following table summarizes the power button functions.

Function Action

Poweron Pressthe power button for at least two seconds when the power is off

Poweroff Pressthe power button momentarily (1/2 second or less) when the power is on

Backlighton Pressthe power button for three seconds or more when the power is on and

thebacklight is off

Backlightoff Pressthe power button for three seconds or more when the backlight is on

6.4 Display and Backlight

The displayshows measurement data and other information depending on the

selected mode.

The upper part of the display continually showsthe most recent measurement.

It uses largedigits for easy viewing. A new measurement is produced and dis-

played everysecond. The unit associated with the measurement is shown in

21

6 General Operation

Power Button

+–

Figure5 12V DC Power Source Polarity

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)