Document Outline

• Table of Contents
  • 1 Before You Start 1
    • 1.1 Symbols Used 1
    • 1.2 Safety Information 2
      • 1.2.1 Warnings 2
      • 1.2.2 Cautions 3
    • 1.3 Authorized Service Centers 4
  • 2 Introduction 7
  • 3 Specifications and Environmental Conditions 9
    • 3.1 Specifications 9
    • 3.2 Environmental Conditions 10
  • 4 Quick Start 11
    • 4.1 Unpacking 11
    • 4.2 Power 11
    • 4.3 Connecting the Probe 11
  • 5 Parts and Controls 13
    • 5.1 Front Panel Buttons 13
    • 5.2 Rear Panel 14
  • 6 General Operation 15
    • 6.1 Selecting Units 15
    • 6.2 Parameter Menus 15
    • 6.3 Menu Lockout 15
    • 6.4 Selecting the Probe Characterization 17
      • 6.4.1 Setting the Probe Characterization Type 17
      • 6.4.2 Setting the Characterization Coefficients 17
      • 6.4.3 ITS-90 PRT and Coefficients 18
      • 6.4.4 Callendar-Van Dusen (RTD) Conversion 20
      • 6.4.5 IPTS-68 Conversion 21
        • 6.4.5.1 Setting the Characterization Coefficients 21
        • 6.4.5.2 Testing the Coefficients 21
    • 6.5 Filtering 22
    • 6.6 Setting the Current 22
    • 6.7 Power Saver 22
  • 7 Digital Communications Interface 23
    • 7.1 Serial Interface 23
      • 7.1.1 Setting the Baud Rate 23
      • 7.1.2 Automatic Transmission of Measurements 24
      • 7.1.3 Time Stamp and System Clock 24
      • 7.1.4 Duplex Mode and Linefeed 25
    • 7.2 GPIB Interface 25
      • 7.2.1 Setting the Address 26
      • 7.2.2 Setting the Termination Character 26
      • 7.2.3 Time Stamp 26
    • 7.3 Remote Commands 26
      • 7.3.1 Measurement Commands 26
        • 7.3.1.1 Reading Temperature 28
        • 7.3.1.2 Automatically Transmitting Measurements 29
        • 7.3.1.3 Selecting the Unit of Measurement 29
        • 7.3.1.4 Enabling the Time Stamp 29
        • 7.3.1.5 Setting the Clock 29
      • 7.3.2 Probe Characterization Commands 29
        • 7.3.2.1 Selecting the Characterization 30
        • 7.3.2.2 Testing the Characterization 30
      • 7.3.3 Sample Commands 30
        • 7.3.3.1 Setting the Filter 31
        • 7.3.3.2 Setting the Probe Current 31
        • 7.3.3.3 Setting the Power Saver 31
      • 7.3.4 Communication Commands 31
        • 7.3.4.1 Setting the Duplex Mode 31
        • 7.3.4.2 Setting the Linefeed Option 31
      • 7.3.5 Calibration Commands 32
        • 7.3.5.1 Entering the Password 32
        • 7.3.5.2 Setting the Menu Lockout 32
        • 7.3.5.3 Setting the Calibration Coefficients 32
        • 7.3.5.4 Setting the Serial Number 32
      • 7.3.6 Other Commands 32
        • 7.3.6.1 Instrument Identification 32
        • 7.3.6.2 Reading a List of Commands 33
  • 8 Calibration Procedure 35
    • 8.1 Accessing the Calibration Parameters 35
    • 8.2 Calibration Procedure 36
  • 9 Maintenance 37
  • 10 Troubleshooting 39
    • 10.1 CE Comments 40
      • 10.1.1 EMC Directive 40
        • 10.1.1.1 Immunity Testing 41
        • 10.1.1.2 Emission Testing 41
      • 10.1.2 Low Voltage Directive (Safety) 41
• Figures
  • Figure 1 Connecting a four-wire probe 12
  • Figure 2 1502A Front Panel 13
  • Figure 3 1502A Back Panel 14
  • Figure 4 Parameter Menu Structure 16
  • Figure 5 Serial Cable Wiring 23
• Tables
  • Table1 International Electrical Symbols 1
  • Table 2 Matching Certificate Values to 1502A ITS-90 Coefficients 18
  • Table 3 Setting Coefficients Rtpw, a8, b8, a4, and b4 19
  • Table 4 Setting Coefficients Rtpw, a5, and b5 19
  • Table 5 Setting Coefficients R(273.16), a6, b6, c6, and d 20
  • Table 6 Command List 27
  • Table 6 Command List Continued 28