Fluke 9150 S

”EXIT” simultaneously and release. The heater power is displayed as a percent-

age of full power.

962.4 Well temperature

S+E Access heater power in secondary menu

100.0 P Heater power in percent

Toexit out of the secondary menu press “EXIT”. To continue on to the

set-point voltage setting function press “SET”.

8.7 Set-point Voltage

The set-pointvoltage is displayed for informational purposes and is used to cal-

ibrate the instrument.

The valueof the set-point voltage changes when the set-point temperature is

changed and also when DC1 and DC2 areadjusted.

S+E Access heater power in secondary menu

100.0 P Heater power in percent

SAccess set-point voltage

11.934U Set-point voltage in millivolts

Toexit out of the secondary menu, press “EXIT”. To continue on to the propor-

tional band setting function press “SET”.

8.8 Proportional Band

In a proportionalcontroller such a this the heater output power is proportional

to the welltemperature over a limited range of temperatures around the

set-point.This range of temperature is called proportional band. At the bottom

of the proportionalband the heater output is 100%. At the top of the propor-

tionalband the heateroutput is 0. Thus as the temperature rises the heater

poweris reduced, which consequently tends to lower the temperature back

down. In this waythe temperatu reis main tained ata fairly constan t

temperature.

The temperature stability of the well and response time depend on the width of

the proportionalband. If the band is too widethe well temperature deviates ex-

cessivelyfrom the set-point due to varying external conditions. This deviation

is because the poweroutput changes very little with temperature and the con-

29

8 Controller Operation

Set-point Voltage

Contents

Main Page Table of Contents 9 Digital Communication Interface . . . . . . . . . . . . . . . . 37 10 Test Probe Calibration . . . . . . . . . . . . . . . . . . . . . . 43 Page 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 3.2 Environmental Conditions 3.3 Warranty 4 Safety Guidelines 5 Quick Start 5.1 Unpacking 5.2 Set-Up 5.3 Power 5.4 Setting the Temperature 6 Parts and Controls 6.1 Back Panel 6.2 Front Panel 6.3 Constant Temperature Block Assembly 6.3.1 Constant Temperature Block 6.3.2 Probe Sleeves and Tongs Page 7 General Operation 7.1 Changing Display Units Un= C 7.2 Switching to 230V Operation 8 Controller Operation 8.1 Well Temperature 962.3 C 8.2 Temperature Set-point 8.2.1 Programmable Set-points Page S 8.3 Scan S 8.4 Ramp and Soak Program 8.4.1 Program Points 962.4 S+U S 8.4.3 Program Set-Points SP 1 SP 4 S 0962.7 0970.0 S Pt 4 S 00001 00200 S Sr 4 S 10.0 11.3 S 8.4.4 Program Function Mode Pf=1 Pf=4 S 8.4.5 Program Control P=OFF P=Go S 8.5 Secondary Menu 8.6 Heater Power 962.4 8.7 Set-point Voltage S 11.934U 8.8 Proportional Band S 11.934 U S ProP 30.0 30.5 S 8.9 Controller Configuration 8.10 Operating Parameters S 8.11 Serial Interface Parameters Page 8.12 Calibration Parameters Page 9 Digital Communication Interface 9.1 Serial Communications 9.1.1 Wiring 9.1.2 Setup 9.1.3 Serial Operation 9.2 Interface Commands Table 2 Communications Command Summary 9 Digital Communication Interface Interface Commands Table 3 Communications Commands Summary continued Table 4 Communications Commands Summary continued 10 Test Probe Calibration 10.1 Calibrating a Single Probe 10.2 Furnace Characteristics 10.2.1 Stabilization and Accuracy Page 11 Calibration Procedure 11.1 Calibration Points 11.2 Calibration Procedure Page 12 Maintenance 13 Troubleshooting 13.1 Troubleshooting Problems,Possible Causes, and Solutions 13.2 Comments 13.2.1 EMC Directive 13.2.2 Low Voltage Directive (Safety)