Fluke 9140 7.7 Operating Parameters, 7.8 Serial Interface Parameters

7.6.1.2 ALPHA

This probe parameter refers to the average sensitivityof the probe between 0

and 100°C. The value of this parameter is set at the factory for best instrument

accuracy.

7.6.1.3 DELTA

This probe parameter characterizes the curvature of the resistance-temperature

relationship of the sensor.The value of this parameter is set at the factory for

best instrument accuracy.

7.7 Operating Parameters

The operating parameters menu is indicated by,

PAr Operating parameters menu

The operating parameters menu contains NOTHING ATPRESENT.

7.8 Serial Interface Parameters

The serial RS-232 interface parameters menu is indicatedby,

SErIAL Serial RS-232 interface parameters menu

Press “UP” to enter the menu. The serial interface parameters menu contains

parameters which determine the operation of the serial interface. These controls

only apply to instruments fitted with the serial interface. The parameters in the

menu are — baud rate, sample period, duplex mode, and linefeed.

7.8.0.1 Baud Rate

The baud rate is the first parameter in the menu. The baud rate setting deter-

mines the serial communications transmission rate.

The baud rate parameter is indicated by,

bAUd Serial baud rate parameter

Press “SET” to choose to set the baud rate. The current baud rate value will

then be displayed.

2400 b Current baud rate

The baud rate of the serial communications may be programmed to 300, 600,

1200, 2400, 4800, or 9600 baud. The default factory setting is 2400 baud. Use

“UP” or “DOWN” to change the BAUDrate value.

9140 Dry-well Calibrator

User’s Guide

30

Contents

Main Page Table of Contents 8 Digital Communication Interface . . . . . . . . . . . . . . . . 33 9 Test Probe Calibration . . . . . . . . . . . . . . . . . . . . . . 39 Page Figures Page 1 Before You Start 1.1 Symbols Used Table1 lists the symbols used on the instrument or in this manual and the meaning of each symbol. 1.2 Safety Information 1.2.1 WARNINGS Page 1.2.2 CAUTIONS 1.3 Authorized Service Centers Page 2 Introduction 3 Specifications and Environmental Conditions 3.1 Specifications 3.2 Environmental Conditions 9 3 Specifications and Environmental Conditions Specifications 3.3 Warranty 4 Quick Start 4.1 Unpacking 4.2 Set-Up 4.3 Power 4.4 Setting the Temperature 5 Parts and Controls 5.1 Rear Panel 5.2 Front Panel 5.3 Constant Temperature Block Assembly 5.3.1 Constant Temperature Block 5.3.2 Probe Sleeves and Tongs Page 6 General Operation 6.1 Calibrator Set-Up 6.2 Changing Display Units Un= C 6.3 Switching to 230 V Operation 6.4 Setting the Temperature 6.5 Calibrating Probes Page 7 Controller Operation 7.1 Well Temperature 100.0 C 7.2 Temperature Set-point 7.2.1 Programmable Set-points Page S 7.3 Scan S 7.4 Temperature Display Hold 7.4.1 Hold Temperature Display 143.5 C U c 144.8 7.4.2 Mode Setting 7.4.3 Switch Wiring 7.4.4 Switch Test Example 7.5 Secondary Menu 7.5.1 Heater Power 100.0 C S+EAccess heater power in secondary menu SEC 12.0P 7.5.2 Proportional Band S+EAccess heater power in secondary menu SEC S 12.0P S 7.6 Controller Configuration 7.6.1 Calibration Parameters CAL 7.7 Operating Parameters PAr 7.8 Serial Interface Parameters SErIAL bAUd Page Page 8 Digital Communication Interface 8.1 Serial Communications 8.1.1 Wiring 8.1.2 Setup 8.1.3 Serial Operation 8.2 Interface Commands Users Guide Tabl e 2 9140 controller communications commands 36 37 8 Digital Communication Interface Interface Commands Tabl e 3 9140 controller communications commands continued 9 Test Probe Calibration 9.1 Comparison Methods 9.1.1 Calibrating a Single Probe 9.1.2 Comparison Calibration 9.1.3 Calibration of Multiple Probes 9.2 Dry-well Characteristics 9.2.1 Vertical Gradient 9.2.2 Heating and Cooling Rates WARNING:DO NOT remove inserts when heating or when the unit is hot. 9.2.3 Stabilization and Accuracy Figure 8 Typical Cooling Rate 41 9 Test Probe Calibration Dry-well Characteristics BlockTemperature C Page 10 Calibration Procedure 10.1 Calibration Points 10.2 Calibration Procedure 10.2.1 Compute DELTA: 10.2.2 Compute R0& ALPHA: 10.2.3 Accuracy & Repeatability 11 Maintenance 12 Troubleshooting 12.1 Troubleshooting Problems, Possible Causes, and Solutions 12.2 CE Comments 12.2.1 EMC Directive 50 12.2.2 Low Voltage Directive (Safety) Users Guide