Guildline 6560 User manual

TECHNICAL MANUAL
FOR
MODEL 6560
"RESISTANCE CALIBRATOR"
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 consent of Guildline Instruments.
TM6560-J-00

i
TABLE OF CONTENTS
1INTRODUCTION 1
1.1 SCOPE ........................................................................................................................................ 1
1.2 GENERAL DESCRIPTION........................................................................................................... 1
2 SPECIFICATIONS..................................................................................................................................... 2
3 OPERATING INSTRUCTIONS................................................................................................................... 5
3.1 INSTALLATION ........................................................................................................................... 5
3.2 FRONT PANEL INDICATORS..................................................................................................... 5
3.2.1 DISPLAY WINDOW ........................................................................................ 5
3.2.2 GUARD INDICATOR...................................................................................... 7
3.2.3 CAL MODE INDICATOR................................................................................ 7
3.2.4 2-TERMINAL INDICATOR.............................................................................. 7
3.2.5 4-TERMINAL INDICATOR.............................................................................. 7
3.2.6 SRQ INDICATOR............................................................................................ 7
3.2.7 LISTEN INDICATOR ....................................................................................... 7
3.2.8 TALK INDICATOR .......................................................................................... 7
3.2.9 REMOTE INDICATOR..................................................................................... 7
3.2.10 LOCAL INDICATOR ...................................................................................... 8
3.3 FRONT PANEL CONTROLS........................................................................................................ 8
3.3.1 POWER SWITCH............................................................................................. 8
3.3.2 REMOTE LOCAL KEY..................................................................................... 8
3.3.3 GUARD KEY.................................................................................................... 8
3.3.4 RESET KEY ....................................................................................................... 8
3.3.5 CAL EDIT KEY................................................................................................. 8
3.3.6 CAL MODE KEY............................................................................................. 9
3.3.7 2-TERMINAL KEY ........................................................................................... 9
3.3.8 4-TERMINAL KEY............................................................................................ 9
3.3.9 ↓kΩKEY.......................................................................................................... 9
3.3.10 ↑MΩKEY ........................................................................................................ 9
3.3.11 0-9 DIGIT KEYS............................................................................................... 9
3.3.12 ENTER KEY ..................................................................................................... 10
3.3.13 BACK SPACE KEY......................................................................................... 10
3.4 REAR PANEL CONTROLS......................................................................................................... 10
3.4.1 VOLTAGE SELECTION DRUM....................................................................... 10
3.4.2 GPIB ADDRESS SWITCHES........................................................................... 13
3.4.3 NORMAL/CAL KEY SWITCH........................................................................ 15
3.5 FRONT PANEL CONNECTORS................................................................................................. 15
3.5.1 C1- CURRENT TERMINAL 1.......................................................................... 17
3.5.2 C2- CURRENT TERMINAL 2.......................................................................... 17
3.5.3 P1- POTENTIAL TERMINAL 1........................................................................ 17
3.5.4 P2- POTENTIAL TERMINAL 2........................................................................ 18
3.5.5 GUARD TERMINAL........................................................................................ 18
3.5.6 GND - GROUND TERMINAL........................................................................ 18
3.6 REAR PANEL CONNECTORS................................................................................................... 18

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3.6.1 GPIB DATA CONNECTOR ........................................................................... 18
3.6.2 POWER INLET CONNECTOR........................................................................ 18
3.7 SELECTING A RESISTANCE...................................................................................................... 18
3.8 CHANGING CALIBRATION COEFFICIENTS .......................................................................... 18
4 REMOTE CONTROL................................................................................................................................. 20
4.1 GPIB INTERFACE....................................................................................................................... 20
4.1.2 GPIB OUTPUT BUFFERING............................................................................ 23
4.1.3 GPIB DEADLOCK.......................................................................................... 23
4.1.4 GPIB DEVICE CLEAR.................................................................................... 23
4.1.5 GPIB DEVICE TRIGGER ................................................................................ 23
4.1.6 REMOTE AND LOCAL OPERATION............................................................. 23
4.1.7 UNRECOGNIZED GPIB COMMANDS ........................................................ 25
4.1.8 GPIB COMMAND PARSER .......................................................................... 25
4.1.9 GPIB END OF MESSAGE TERMINATOR...................................................... 25
4.2 GPIB COMMANDS................................................................................................................... 26
4.2.1 *ESE - SET EVENTS ENABLE REGISTER......................................................... 26
4.2.2 *ESE? - EVENT STATUS ENABLE QUERY...................................................... 26
4.2.3 *ESR? - EVENT STATUS REGISTER QUERY................................................... 26
4.2.4 *IDN? - IDENTIFICATION QUERY................................................................ 29
4.2.5 *OPC - OPERATION COMPLETE................................................................. 29
4.2.6 *OPC? - OPERATION COMPLETE QUERY.................................................. 29
4.2.7 *OPT? - REPORT AVAILABLE OPTIONS...................................................... 29
4.2.8 *RST - DEVICE RESET..................................................................................... 30
4.2.9 *SRE - SERVICE REQUEST ENABLE COMMAND........................................ 30
4.2.10 *SRE? - SERVICE REQUEST ENABLE QUERY............................................... 31
4.2.11 *STB? - READ STATUS BYTE QUERY............................................................. 31
4.2.12 *TRG - GROUP EXECUTE TRIGGER............................................................. 31
4.2.13 CAL? - DISPLAY THE DATE OF THE LAST CALIBRATION........................... 31
4.2.14 DATE - SET THE SYSTEM DATE...................................................................... 33
4.2.15 DATE? - DISPLAY THE 6560 INTERNAL DATE............................................. 33
4.2.16 KEY? REPORT LAST KEY PRESSED................................................................ 33
4.2.17 KEY <KEYNAME> ENTER A KEYSTROKE..................................................... 34
4.2.18 OPTIONS? - DISPLAY THE OPTION SWITCH SETTINGS............................. 35
4.2.19 RESISTOR - SELECT A RESISTOR................................................................... 35
4.2.20 RESISTOR? - DISPLAY THE CURRENTLY SELECTED RESISTOR .................. 36
4.2.21 ROMCHECKSUM? - DISPLAY THE ROM CHECKSUM............................... 36
4.2.22 SINCE? - DISPLAY THE TIME THE 6560 WAS LAST RESET ......................... 37
4.2.23 SERIALNUMBER - SET THE 6560 SERIAL NUMBER...................................... 37
4.2.24 SOFCALTM - SET CALIBRATION COEFFICIENTS......................................... 37
4.2.25 SOFCAL? - EXAMINE CALIBRATION COEFFICIENTS............................... 38
4.2.26 TERSE - TURN OFF VERBOSE MODE............................................................ 39
4.2.27 TIME - SET THE TIME SYSTEM........................................................................ 39
4.2.28 TIME? - DISPLAY THE SYSTEM TIME............................................................. 39
4.2.29 TIMEZONE - SET THE OPERATIONAL TIMEZONE........................................ 39
4.2.30 UPTIME? - DISPLAY HOW LONG THE 6560 HAS BEEN RUNNING........... 40
4.2.31 VERBOSE - SET VERBOSE MODE................................................................. 40
4.3 PROGRAMMING HINTS........................................................................................................... 40
5 OPTIONS.................................................................................................................................................. 41
5.1 DIP SWITCHES........................................................................................................................... 41

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5.1.1 OPTION SWITCHES 1 TO 4 - RESERVED...................................................... 41
5.1.2 OPTION SWITCH 5 - 50/60 Hz SELECT ....................................................... 42
5.1.3 OPTION SWITCH 6 - LAST RESISTANCE...................................................... 42
5.1.4 OPTION SWITCH 7 - OPEN/SHORT............................................................. 42
5.1.5 OPTION SWITCH 8 - FACTORY CALIBRATION.......................................... 42
6 SPECIFICATION VERIFICATION............................................................................................................ 44
6.1 ULTIMATE SPECIFICATIONS..................................................................................................... 44
6.1.1 EQUIPMENT REQUIRED .............................................................................................. 44
6.2 RESISTANCE MEASUREMENT WITH A 9975 CURRENT COMPARATOR .............................. 45
6.2.1 10 kΩAND BELOW ...................................................................................... 45
6.2.2 19 kΩAND 100 kΩ...................................................................................... 49
6.2.3 ABOVE 100 kΩ............................................................................................. 53
6.3 BASIC SPECIFICATIONS.......................................................................................................... 57
6.4 COMPUTING RESISTANCE VALUES........................................................................................ 57
7 PRINCIPLES OF OPERATION ................................................................................................................. 58
7.1 INTRODUCTION........................................................................................................................ 58
7.2 POWER SUPPLY......................................................................................................................... 58
7.3 CONTROL pcb.......................................................................................................................... 58
7.3.1 POWER AND CONTROL............................................................................... 59
7.3.2 CENTRAL PROCESSING UNIT...................................................................... 59
7.3.3 MEMORY....................................................................................................... 61
7.3.4 SERIAL INTERFACES (OPTIONAL) ............................................................... 61
7.3.5 KEYBOARD INTERFACES.............................................................................. 62
7.3.6 CHART RECORDER OUTPUT (OPTIONAL).................................................. 62
7.3.7 GPIB INTERFACE........................................................................................... 63
7.4 FRONT PANEL pcb................................................................................................................... 63
7.4.1 VACUUM-FLUORESCENT DISPLAY............................................................. 63
7.4.2 KEYBOARD.................................................................................................... 63
7.4.3 LIGHT EMITTING DIODES ............................................................................. 64
7.4.4 DISPLAY TO RESISTOR pcb INTERFACE..................................................... 64
7.5 RESISTOR/RELAY pcb.............................................................................................................. 64
7.6 SOFTWARE................................................................................................................................. 65
8 TROUBLESHOOTING AND MAINTENANCE......................................................................................... 66
8.1 TROUBLESHOOTING................................................................................................................. 66
8.2 SOFTWARE DIAGNOSTICS...................................................................................................... 66
8.2.1 SETTING THE INTERNAL REAL TIME CLOCK............................................... 67
8.2.2 CHECKING THE ROM CHECKSUM............................................................. 67
8.2.3 TESTING THE NON-VOLATILE MEMORY (EEROM).................................... 67
8.2.4 TESTING THE RELAY DRIVERS ...................................................................... 68
8.2.5 TESTING THE DISPLAY................................................................................... 68
8.2.6 TESTING THE GPIB SWITCHES...................................................................... 69
8.2.7 DISPLAYING THE DATE CALIBRATION....................................................... 69
8.2.8 SETTING THE INSTRUMENT SERIAL NUMBER .............................................. 69
8.3 PREVENTATIVE MAINTENANCE.............................................................................................. 69
9 PARTS LISTS.............................................................................................................................................. 71

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10 DRAWINGS ............................................................................................................................................. 72

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LIST OF FIGURES
Figure 3.1: Keyboard and Display.............................................................................................. 6
Figure 3.2: Rear Panel.................................................................................................................. 11
Figure 3.3: Opening the Power Receptacle .......................................................................... 12
Figure 3.4: Switch Settings........................................................................................................... 14
Figure 3.5: Ideal Circuit................................................................................................................ 15
Figure 3.6: Functional Circuit...................................................................................................... 16
Figure 3.7: Leakage Circuit......................................................................................................... 17
Figure 4.1: Event Status Bit Operation ...................................................................................... 27
Figure 5.1: Location of Option Switch on Control PCB......................................................... 41
Figure 6.1: 9975 Current Comparator ...................................................................................... 45
Figure 6.2: 9975 Current Comparator connections for measurement of
resistances up to 10 kΩ............................................................................................ 46
Figure 6.3: 9975 Current Comparator connections for measurement of
resistances between 19 kΩand 100 kΩ............................................................... 50
Figure 6.4.: 9975 Current Comparator connections for measurement of
resistances greater than 100 kΩ............................................................................ 54

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LIST OF TABLES
Table 2.1: Basic Instrument Specifications..................................................................................................... 2
Table 2.2: Resistance Specifications (4-wire Mode) .................................................................................... 4
Table 3.1: Recommended Fuses.................................................................................................................... 12
Table 3.2: Line Cord Wiring............................................................................................................................... 13
Table 3.3: GPIB Mode Switches....................................................................................................................... 14
Table 4.1: IEEE-488.1 Pin Designations............................................................................................................ 21
Table 4.2: GPIB Device Capabilities............................................................................................................... 22
Table 4.3: Remote/Local State Transitions.................................................................................................... 25
Table 4.4: Event Status Register....................................................................................................................... 28
Table 4.5: Status Byte Register......................................................................................................................... 32
Table 4.6: Keyboard Character Designations.............................................................................................. 34
Table 5.1: Option Switches............................................................................................................................... 43
Table 6.1: CURRENT IxmA to Applied Voltage Conversion....................................................................... 52

1
1 INTRODUCTION
1.1 SCOPE
This manual contains technical specifications, detailed description and maintenance information
and diagrams for the Guildline Instrument's 6560 Resistance Calibrator.
1.2 GENERAL DESCRIPTION
The 6560 Resistance Calibrator provides a wide range of high precision resistors selected for use in
calibrating ohm-meters. All of the resistors may be selected under remote control from the GPIB
interface, this is especially useful in automated calibration setups.
Uses for the 6560 Resistance Calibrator include:
• Maintaining a set of precision reference resistors.
• Automatic calibration of precision resistance measurement apparatus.
• Providing an easy to use resistance standard.
In addition to the front panel manual controls, the Resistance Calibrator can be controlled from a
GPIB (IEEE-488) bus interface. Remote control commands include monitoring the current resistance
as well as selecting alternate resistances.

2
2 SPECIFICATIONS
┌
─────────────────────────────────────────
─
─
───────────
┐
│Specifications for Guildline Instruments │
│6560 Resistance Calibrator │
╞══════════════╤══════════════════════════╤════════════╡
│Operating │23 ± 5 │°C │
│├──────────────────────────┼────────────┤
│Temperature │70 ± 8 │°F │
├──────────────┼──────────────────────────┼────────────┤
│Operating │││
│Humidity │< 70% │R.H. │
├──────────────┼──────────────────────────┼────────────┤
│Power │││
│Requirements │50 │Volt Amps │
├──────────────┼──────────────────────────┼────────────┤
│Voltage │││
│Requirements │100,120, 220, 240 ± 10% │VAC 50/60 Hz│
├──────────────┼──────────────────────────┼────────────┤
│Dimensions │44.2 X 45.7 X 8.9 high │cm │
│├──────────────────────────┼────────────┤
││17.4 X 18 X 3.5 high │in │
├──────────────┼──────────────────────────┼────────────┤
│Weight │11 │kg │
│├──────────────────────────┼────────────┤
││25 │lbs │
└──────────────┴──────────────────────────┴────────────┘
Table 2.1: Basic Instrument Specifications

3
Other features include:
• Bench top mounting or rack mount with extra flanges provided separately.
• Hidden voltage selection switch on rear panel.
• GPIB Bus Address selectable from rear panel.
Each resistance element will be within 0.1% of the nominal value. The actual resistance values will
be displayed on the instrument's front panel readout with an uncertainty which is the sum of the
following:
1. the uncertainty of the original calibration.
2. the error due to the stability of the resistance element and the time elapsed from the date
of last calibration.
3. the product of the temperature coefficient (the fourth column of Table 2.2) and the
change in ambient temperature from the temperature at which the instrument was
calibrated.
The computation of total uncertainty is based on the following assumptions:
1. the relative humidity of the environment is <70% and the instrument has been in a
controlled environment for at least 72 hours.
2. the resistance elements have not been stressed beyond their maximum current ratings at
any time since calibration.
3. the resistance elements have not been stressed by large changes in their ambient
conditions (temperature and humidity) at any time since calibration.