Keithley 7059 Service manual
Model 7059
Low Voltage Scanner Plug-h Card
Instruction Manual
Publication Date: February 1989
Document Number: 7059-901-01 Rev. E
WARRANTY
SPECIFICAITONS
MODEL 7059 LOW VOLTAGE SCANNER CARD
CHANNELS PER CARD: 10.
CONTACT CONFIGURATION: Z-pole Form A, common guard connection.
CONNECTOR TYPE: Screw terminal, No. 18 AWG maximum wire size.
RELAY DRIVE CURRENT: UmA per relay typical.
MAXIMUM SIGNAL LEVEL: ZOOV, lOOmA, 2VA peak (resistive load).
CONTACT LIFE: IO 8 &sues (cold switching); 10’ closuvs (at maximum signal level).
CONTACT RESISTANCE: <Zfl to rated life.
CONTACT POTENTIAL: <l&J input to output with copper leads (< 2OOnV typical < 1
minute after actuation).
WARM UP: 1 hour for thermal stability
ACTUATION TIME: <2ms, exclusive of mainframe.
CHANNEL ISOLATION: >lOl*fI and <lO@
INPUT ISOLATION,
Differential: >109fl and 40pF.
Common Mode: >lOQ and <15OpE
COMMON MODE VOLTAGE: <ZOOV peak.
ENVIRONMENT,
Operating: 0” to 50°C. up to 35’C at 70%
Storage: -25” to 65°C.
DIMENSIONS, WEIGHT: 32mm
10%“). Net weight 0.35kg (12% oz.).
high x 114mm wide x 272mm long (1%” x 4’lr” x
RH.
Bec.wse of the high impedance of the board special care should be
taken in both handling and using the board to prevent degradation of
performance. Handle the board only by the edges when using it and
keep the board free of body oils. dirt and contaminants. To clean the
board use FreorP TMS or TE or equivalent and a clean cotton swab
or soft brush. Care should be taken to ensure that the solvent is not
contaminated before using it on the board. After the solvent has been
applied blow dry the board with dry nitrogen 888.
SAFETY SYMBOLS AND TERMS
The symbol m denotes that the user should refer to the operating instructions.
The symbol & denotes that a high voltage may be present on the ter-
minallsl.
The WARNING used in this manual explains dangers that could result in
personal injury or death.
The CAUTION used in this manual explains hazards that could damage the
instrument.
NOTE
TABLE OF CONTENTS
SECTION l-GENERAL INFORMATION
Introduction ............................................
1.1
Warranty Information
1.2
ManualAddenda ........................................
1.3
SECTION Z-OPERATION
Introduction ............................................
2.1
Wiring and Installation
2.2
Operating Considerations .................................
2.3
Operating Hints
2.4
SECTION 3-MAINTENANCE
Introduction ............................................
3.1
Required Test Equipment
3.2
PerformanceVerification
3.3
3.3.1
3.3.2 Contact ResistanceTest
3.3.3 Isolation Test.
4.1
4.2
4.3
4.4
4.5
Thermal Offset Test
SECTION 4--REPLACEABLE PARTS
Introduction ............................................
ReplaceableParts ........................................
Ordering Information .....................................
Factory Service
Component Layout and Schematic Diagram .................
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LIST OF FIGURES
5
5
5
z
7
9
9
9
9
9
Plug-In Card Installation and Assembly
1
How to Use GUARD Connections
2
Test Set Up for Thermal Offset Test
3
ShortingHIandLOofallChannelsonCard.. ................
4
Test Set Up for Contact Resistance Test
5
Channel Isolation Test Setup
6
GUARD Differential Isolation Test Setup
7
Common Mode Isolation Test Setup
6
Model 7058 Component Location Drawing
9
Model 7059 Schematic Diagram
10
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.......................... 4
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LIST OF TABLES
Recommended Test Equipment,,
1
Model 7059 Replaceable Parts List.
2
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6
6
7
;
9
13
15
5
12
SECTION 1
GENERAL INFORMATION
1.1 INTRODUCTION
The Model 7059 is a low-voltage scanner plug-in card which is fieldinstallable in the Model 705 and Model 706 scanner mainframes. The Model
7059 will switch up to 10 channels. For low-level transducer and thermo-
couple output switching the Model 7059 is designed to introduce a minimum
of thermal voltage error I < l&V input to output with copper leads). and ensure that high isolation (10% is maintained between input signals. Expected relay life (106 closures) is obtained when signals less than 1OV or
1OmA are switched. However, peak signals up to 2OOV or lOOmA may be
switched with the scanner. Quick disconnect screw terminals are used to
facilitate input and output connections to the scanner plug-in card (relay
cardl. The plug-in card is easily removed through the rear panel of the scanner mainframe.
1.2 WARRANTY INFORMATION
Warranty information is stated on the inside front cover of this manual. If there is
a need for service, contact the Keithley representative or authorized repair facility
in your area. Check the back cover of this manual for addresses. The service
form supplied at the end of the manual should be used to provide the repair
facility with adequate information concerning any difficulty.
1.3 MANUAL ADDENDA
Improvements or changes to this manual will be explained on an addendum
included with this manual.
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