Fluke 1504 4.4 DC Power Option

to pins4 and 5. (Pins 1 and 5 source current and pins 2 and 4 sense the poten-

tial.)If a shield wire is present it should be connected to pin 3.

A two-wireprobe can also be used with the 1504. It is connected by attaching

one wireto both pins 1 and 2 of the plug and the other wire to both pins 4 and

5. If a shieldwire is present it should be connected to pin 3. Accuracy may be

significantlydegraded using a two-wire connection because of lead resistance.

4.4 DC Power Option

Withthe DC power option (Model 2502) installed the 1504 can be powered

from a 12 V batteryor other 12 V DC power source. The DC power socket is

located on the rear panel of the 1504 abovethe AC power jack. The 1504 ac-

cepts a7/32 inch diameter, two-conductor DC power plug such as Switchcraft®

PN. 760. Observethe correct polarity as shown in Figure 2. The outside con-

1504 Thermometer Readout

User’s Guide

RTDSensor

ProbeConnector

Shield

Figure1 Connecting a four-wire probe

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)