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Guildline 6675A User Manual

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VOLUME I
TECHNICAL MANUAL
FOR
MODEL 6675A
AUTOMATIC DIRECT-CURRENT-COMPARATOR
RESISTANCE BRIDGE
NOTICE
The contents and information contained in this manual are proprietary to
Guildline Instruments. They are to be used only as a guide to the operation
and maintenance of the equipment with which this manual was issued and may
not be duplicated or transmitted by any means, either in whole or in part,
without the written permission of Guildline Instruments.
VOL I TM6675A-C-00
January 30, 2001
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Guildline 6675A Specifications

General IconGeneral
BrandGuildline
Model6675A
CategoryMeasuring Instruments
LanguageEnglish

Summary

1. INTRODUCTION

1.1. MODEL 6675A AUTOMATIC DIRECT-CURRENT-COMPARATOR RESISTANCE BRIDGE GENERAL DESCRIPTION

Provides a general description of the Guildline Model 6675A Automatic Direct-Current-Comparator Resistance Ratio Bridge.

1.2. PANEL FRONT TERMINALS/CONTROLS

Details the front panel terminals and controls of the 6675A, including input terminals and keypad.

1.3. REAR PANEL CONNECTORS/CONTROLS

Describes the rear panel connectors and controls, such as chart recorder output, IEEE-488, RS232, and power switch.

2. PERFORMANCE SPECIFICATIONS

2.1. GENERAL SPECIFICATIONS

Lists general specifications for the 6675A, including operating temperature, humidity, power, dimensions, and weight.

2.2. GENERAL SPECIFICATIONS (continued)

Continues the general specifications, detailing resistance range, linearity, temperature coefficient, and analog/digital output.

2.3. RESISTANCE MEASUREMENT SPECIFICATIONS

Outlines the resistance measurement specifications, including resolution, uncertainty, and noise limits for various ranges.

2.4. TEMPERATURE MEASUREMENT SPECIFICATION

Details the specifications for temperature measurement, including recommended excitation current, resolution, and uncertainty.

3. OPERATING INSTRUCTIONS

3.1. PRELIMINARIES

Covers preliminary setup steps, including voltage selector, fuse installation, and power cord connection.

3.2. WARNING

Provides critical safety warnings regarding dangerous voltages and handling of the high voltage output terminal.

3.3. OPERATING PROCEDURE

Explains the operating procedure, including keypad functions, display areas, and menu navigation.

3.4. GENERAL KEY/DISPLAY OPERATIONS

Describes general key and display operations, including the base menu and its display configuration.

3.5. BASIC MENU OPERATIONS

Details basic menu operations, including function key actions and navigation between menu levels.

3.6. TITLE SCREEN

Describes the title screen displayed upon power-on and the self-test routines.

3.7. MAIN MENU

Explains the main menu structure and navigation, including Measure, Setup, Voltmeter, and Sofcal options.

3.8. MEASUREMENT OPERATION GUIDE

Provides guidance on measurement operations, including normal, high, low ohms, and thermometry measurements.

3.9. 6675A DATA ACQUISITION SOFTWARE

Details the hardware and software requirements for the 6675A Data Acquisition software, ResCal™.

4. THEORY OF OPERATION

4.1. THEORY I INTRODUCTION

Introduces the theory behind the 6675A's microprocessor-based direct-current-comparator bridge design.

4.2. THEORY II RESISTANCE MEASUREMENT

Explains the resistance measurement theory, background of the Model 9975, and the 6675A's principles.

4.3. NANOVOLT DETECTOR CPU OPTIONS

Details the nanovolt detector's CPU options, including dip switches and principles of operation.

5. REMOTE CONTROL

5.1. INTERFACES

Describes the available interfacing standards for remote control: IEEE-488 and RS232C.

5.2. IEEE-488 (GPIB) INTERFACE

Explains the IEEE-488 (GPIB) interface, its capabilities, and system connections.

5.3. RS232C INTERFACE

Details the RS232C interface for connecting to controllers or printers, including cable requirements.

5.4. COMMAND LANGUAGE

Covers the command language used for IEEE-488 and RS232C interfaces, including syntax rules.

5.5. REMOTE AND LOCAL OPERATION

Explains the operating states: Local, Remote, and Remote with Lockout.

6. CALIBRATION

6.1. TEST EQUIPMENT

Lists the required test equipment for calibrating the 6675A, including standard resistors and baths.

6.2. RATIO 1:1 Using Model 9330 / 1 Ω to Model 9330 / 1 Ω

Provides steps for calibrating a 1:1 ratio using two 1 Ohm standard resistors.

6.3. RATIO 1:1 Using Model 9330 / 10 kΩ to Model 9350 / (10 kΩ Configuration)

Details the procedure for calibrating a 1:1 ratio with 10 kΩ resistors.

6.4. RATIO 10:1

Outlines calibration procedures for 10:1 ratios using different resistor configurations.

6.5. RATIO 1:1

Describes the calibration steps for a 1:1 ratio using 100 MΩ resistors.

7. MAINTENANCE

7.1. INTRODUCTION

Introduces the section on troubleshooting, repair, and alignment of the 6675A.

7.1.1. Error Messages

Lists common error messages and their corresponding corrective measures.

7.1.2. 6675A Warnings

Provides a list of warnings that may appear during operation and recommended corrective actions.

7.1.3. Nanovolt Detector Calibration

Explains the calibration process for the nanovolt detector, including gain and offset adjustments.

7.1.4. Disassembly Procedure

Details the general procedure for disassembling the 6675A to access internal modules.

7.1.5. Reassembly Procedure

Outlines the procedure for reassembling the 6675A after disassembly.

7.2. TROUBLESHOOTING

Provides information to help localize faults to sub-assemblies or discrete components.

7.2.3. Power Supply Check

Details procedures for checking power supply voltages and noise levels on various PCBs.

7.2.4. Alignment Procedure

Covers the alignment procedures, including required test equipment and initial checks.

8. PARTS LISTS - MODEL 6675A

9. DRAWINGS - MODEL 6675A