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Keithley 617 User Manual
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6011
CABLE
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617
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SAFETY
SIGNAL
SHIELD
GUARD
r
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WARNING:
SAFETY
SWELO
RECOMMENDED
FOR
GUARDED
RESISTANCE
MEASUREMENTS
ABOVE
30GR.
UP
TO
300”
MA,’
SE
PRESENT
ON
GUARD
I
COM
617
PREAMP
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A/D
CONVERTER
EQUIVALENT
CIRCUIT
Figure
4-2.
Insulation
Resistance
Measurement
(Guarded1
4-3
92
94
Table of Contents
Table of Contents
5
Features
16
Introduction
16
Manualaddenda
16
Safety Symbols and Terms
16
SECTION L-GENERAL INFORMATION
16
Warranty Information
16
Preparation for Use
17
Specifications
17
Unpacking and Inspection
17
Using this Instruction Manual
17
Accessories
18
Section 2-Operation
20
Repacking for Shipment
18
Introduction
20
Power up Procedure
20
Power up Self Test and Display Messages
20
Controls
21
Display and Indicators
23
Front Panel Familiarization
21
Front Panel Programs
23
IEEE-488 Address
23
Calibration
24
Exponent Mode (Alpha or Numeric)
24
Rear Panel Familiarization
24
Connectors and Terminals
24
Basic Measurement Techniques
26
Warm up Period
26
Linefuse
26
Input Connections
27
Making Voltage Measurements
27
Guarded Operation
29
Meter Loading Considerations
29
Unguarded Circuit
29
Currentmeasurements
31
Voltage Burden Considerations
32
Coulombs Connections
33
Resistance Measurement Connections
35
Voltage Source Connections
36
V/L Resistance Measurement Connections
38
Typical 2V Analog Output Connections
39
Typical Preamp out Connections
40
Electrometer Input Circuitry (Ampsmode)
41
Shielded Fixture Construction
41
Non-Decade Current Gains
44
External Trigger Pulse Specifications
48
Meter Complete Pulse Specifications
49
Leakage Resistance Effects
52
Input Capacitance Effects
53
Busdescription
55
Busmanagementlines
56
Datalines
56
Handshakelines
56
Ieee-488Buslines
56
Buscommands
57
Addressedcommands
58
Universalcommands
58
Commandcodes
59
Commandsequences
59
Hardwareconsiderations
61
Typical Controlled Systems
61
Busconnections
62
Universalcommandsequence
61
Primaryaddressprogramming
63
Talk-Onlymode
63
Controller Handler Software
64
Interface BASIC Programming Statements
64
Ieeecommandgroups
66
General Bus Command Programming
66
Interface Function Codes
66
Ren(Remoteenable)
67
Ifc(Interfaceclear)
68
Llo(Locallockout)
68
Gtl(Gotolocai)
68
Dcl(Deviceclear)
69
SDC (Selective Device Clear)
69
Get(Groupexecutetrigger)
70
Serial Polling (WE, SPD)
70
Device-Dependent Command Programming
71
Execute(X)
72
Function (F)
72
Baseline Suppression (N)
76
Reading Mode (B)
77
Data Store Mode
77
Voltage Source Value (V)
78
Calibration Value (A)
79
Voltage Source Operate
79
Data Format (G)
80
Non-Volatile Memory Storage (L)
80
Trigger Mode (T)
81
EOI and Bus Hold-Off Modes (K)
84
Status(U)
85
Terminator(Y)
85
Front Panel Messages
88
Buserror
88
Numbererror
89
Trigger Overrun Error
89
Bus Data Transmission Times
90
Section 4-Applications
91
Insulation Resistance Measurements
91
4-L
91
Low-Level Leakage Current Measurements
95
Introduction
91
Diodecharacterization
97
Capacitorleakagemeasurements
98
Voltage Coefficients of High-Megohm Resistors
100
Static Charge Detection
102
Using the Model 617 with External Voltage Sources
102
Initial Conditions
104
Introduction
104
Environmental Conditions
104
Recommended Test Equipment
104
Verification Procedure
105
Input Current Verification
105
Amps Verification
105
Coulombs Verification
106
Volts Verification
108
Ohms Verification
109
Ohms Verification (200M0 and Gfl Ranges)
109
Voltage Source Verification
111
Section 6-Theory of Operation
113
Input Preamplifier
113
Input Stage
115
Gain Stage
115
Output Stage
115
Introduction
113
Overall Functional Description
113
Ohms Voltage Source
118
Zero Check
119
Ranging Amplifier
119
Multiplexer and Buffer Amplifier
120
Reference Source
121
A/D Converter
121
Digital Circuitry
123
Microcomputer
123
Memory Elements
123
Device Selection
123
IEEE-486 Bus
123
Input/Output Circuitry
124
Display Circuitry
124
Voltage Source
125
Power Supplies
126
Section 7-Maintenance
127
Introduction
127
Linevoltageselection
127
Calibration
128
Recommended Calibration Equipment
128
Environmentalconditions
128
Warmupperiod
129
Calibrationjumper
129
Front Panel Calibration
130
IEEE-488 Bus Calibration
130
Calibration Sequence
174
Inputoffsetadjustment
174
Ampscalibration
174
Coulombs Calibration
176
Voltscalibration
176
Ohmscalibration
177
Comfuse
128
Fusereplacement
128
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Keithley 617 Specifications
General
Brand
Keithley
Model
617
Category
Measuring Instruments
Language
English
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