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Fluke Manuals
Multimeter
8840A
Instruction manual
Table Of Contents - Fluke 8840A Instruction Manual
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Instruction manual
(182 pages)
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Table Of Contents
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
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Table of Contents
Multimeter Safety
3
Section Guide
5
Table Of Contents
7
List Of Tables
13
List Of Illustrations
14
Introduction And Specifications
17
Options And Accessories
17
Operating Instructions
25
Installation
25
Installing The Power-Line Fuse
25
Connecting To Line Power
25
Operating Features
26
Power-Up Features
26
Front And Rear Panel Features
26
Line Voltage Selection Setting
26
Display Features
27
Error Messages
27
Overrange Indication
27
Rack-Mount Kits
27
Front Panel Features
28
Rear Panel Features
30
Diagnostic Self-Tests
31
Ranging
31
Triggering
31
Autorange
31
Error Codes
32
Making Measurements
33
Reading Rates And Noise Rejection
33
Automatic Setting Time Delay
33
External Trigger Input
33
Measuring Voltage And Resistance
34
Measuring Current
34
Current Fuse Protection
34
Offset Measurements
34
External Cleaning
35
Remote Programming
37
Capabilities
37
Bus Set-Up Procedure
37
An Overview Of Remote Operation
37
A Note About Examples
38
Device-Dependent Command Set
38
Bn (Offset Commands)
38
Ieee-488 Address Selection
38
Remote Operation Block Diagram
39
Cn (Calibration Commands)
40
Dn (Display Commands)
40
Fn (Function Commands)
40
Get Commands
40
Commands Which Correspond To The Front Panel
41
G0 (Get Instrument Configuration)
43
G1 (Get Srq Mask)
43
G2 (Get Calibration Prompt)
43
Output Data Format
44
G3 (Get User-Defined Message)
45
G4 (Get Calibration Status)
45
G5 (Get Iab Status)
45
G6 (Get Yw Status)
45
N (Numeric Entry Command)
46
Put Commands
46
P0 (Put Instrument Configuration)
46
P1 (Put Srq Mask)
46
Status Data
47
P3 (Put User-Defined Message)
48
Rn (Range Commands)
48
Sn (Reading Rate Commands)
48
Tn (Trigger Mode Commands)
48
Trigger Selection Logic Diagram
49
Z0 (Self-Test Command)
50
? (Single-Trigger Command)
50
Input Syntax
50
Definitions
50
Syntax Rules
51
Device-Dependent Messages
52
Output Data
53
Loading Output Data
53
Types Of Output Data
53
Numeric Data And Error Messages
53
Output Priority
54
Service Requests
54
The Serial Poll Register
54
Talk-Only Mode
55
Address Messages
55
Universal Commands
55
Addressed Commands
55
Timing Considerations
56
Immediate Mode Commands
56
Example Programs
56
Immediate-Mode Commands For Various Controllers
56
Using The Ibm Pc
61
Asci/Ieee Std 488-1978 Bus Codes
73
Measurement Tutorial
74
Dc Voltage Measurement
74
Circuit Loading Error
74
Input Bias Current Error
74
Resistance Measurement
75
2-Wire Ohms
75
Correcting For Test Lead Resistance In 2-Wire Ohms
75
Circuit Loading Error Calculation
75
4-Wire Ohm
76
Applications Of The Ohms Functions
76
Measuring Input Bias Current Error
76
Testing Diodes
77
Testing Electrolytic Capacitors
77
A Precision Current Source
78
Dc Current Measurement
79
Reducing Thermal Voltages
79
Ac Voltage And Current
79
True Rms Measurement
79
Ac-Coupled Ac Measurements
80
Burden Voltage Error Calculation
80
Waveform Comparison Chart
81
Combined Ac And Dc Measurements
82
Bandwidth
82
Zero-Input Vac Error
82
Reduction Of Zero-Input Error
83
Theory Of Operation
84
Overall Functional Description
84
Detailed Circuit Description
84
Dc Scaling
84
Overall Functional Block Diagram
85
Dc Scaling (Vdc And Ma Dc)
86
Vdc Protection
87
Ma Dc Scaling
87
Analog Filter
87
Track/Hold Circuit
87
Ohms Current Source
88
Ohms Protection
88
Track/Hold Amplifier
88
Track/Hold Circuit Configurations
89
Timing Diagram For One A/D Cycle
90
Ohms Functions
91
4-Wire Ohms
91
Precision Voltage Reference
91
A/D Converter
92
Ohms Scaling
93
Timing/Data Control
94
Analog-To-Digital Converter
94
First Remainder-Store Period
95
Precision Dac
95
A/D Amplifier
95
Bootstrap Supplies
95
Keyboard
96
Digital Controller
96
In-Guard Microcomputer
96
Autozero Period
96
Digital Controller Block Diagram
97
Function And Range Control
98
A/D Control And Computation
98
Calibration Correction
98
Keyboard/Display Control
98
Read/Write Timing Diagrams For Internal Bus
99
Power Supply
100
Sample Rates And Reading Rates
100
Guard Crossing Circuit
100
Out-Guard Microcomputer
101
Guard Crossing
101
Bus Interface Circuitry
101
Signal Conditioning
101
Ieee-488 Interface Power Supply
102
True Rms Ac (Option -09)
102
Vac Scaling
102
Ma Ac Scaling
102
True Rms Ac-To-Dc Converter
103
Maintenance
106
Performance Test
106
Dc Voltage Test
106
Recommended Test Equipment
107
Ac Voltage Test
108
Connections For Kelvin-Varley Voltage Divider
108
Resistance Test
109
Low- And Mid-Frequency Ac Voltage Test
109
High-Frequency Ac Voltage Test
110
Calibration
111
Basic Calibration Procedure
111
Calibration Functions
113
A/D Calibration
113
A/D Calibration Test
113
Offset And Gain Calibration
114
Advanced Features And Special Considerations
115
Storing Variable Inputs
115
Calibrating Individual Ranges
115
Verifying Calibration
116
Prompts When Calibrating Individual Ranges
116
Tolerance Check
117
Ac Calibration At Other Frequencies
117
Optimizing Use Of The 5450A
117
Remote Calibration
118
Commands Used During Remote Calibration
118
Error Numbers Which Are Displayed When Commands Are Not Valid
120
Remote Erasure
120
Disassembly Procedure
121
Example Calibration Program
121
Example A/D Calibration Program
121
Case Removal
122
True Rms Ac Pca Removal
122
Ieee-488 Interface Pca Removal
122
Main Pca Removal
122
8840A Disassembly
123
Front Panel Disassembly
127
Reassembly Procedure
127
Internal Fuse Replacement
129
Removing The Display Window
129
External Trigger Polarity Selection
130
Troubleshooting
130
Overall State Table
131
Circuitry Tested By The Analog Self-Tests
133
Self-Test Descriptions
134
Digital Controller Troubleshooting
136
In-Guard Microcomputer System
136
U202 Pin Diagram
137
Waveforms For In-Guard Troubleshooting Mode
138
Display System
139
Analog Control Signals
140
Waveforms For Display Logic
140
Evaluating Static Signals
141
Evaluating Dynamic Signals
141
Keyboard Wiring
141
Analog Control Devices
141
Analog Control Logic States
142
Dc Scaling Troubleshooting
143
Track/Hold Troubleshooting
143
Typical Dynamic Control Signals
143
Dc Scaling And Track/Hold Supply Voltages
143
Ohms Current Source Troubleshooting
144
Precision Voltage Reference Troubleshooting
144
Typical Output Waveforms For Track/Hold Circuit (Tp103)
145
A/D Converter Troubleshooting
146
Output Of A/D Amplifier (Tp101)
146
Power Supply Troubleshooting
147
Waveforms At U101-24 And U101-25
147
Typical Bus Data Line Waveform
148
Waveforms At Tp102 For Several Inputs On 2V Dv Range
148
Ieee-488 Interface Troubleshooting
149
Calculating The A/D Reading From Tp102 Waveform
149
Power Supply Voltages
149
Diagnostic Program
150
True Rms Ac Troubleshooting
151
I/O Port Configurations
151
Isolating A Defective Ac Stage
152
Internal Cleaning
153
Guard Crossing Troubleshooting
153
Cleaning Printed Circuit Assemblies
153
Ac Signal Tracing
153
Cleaning After Soldering
154
Guard Crossing Test Waveforms
154
List Of Replaceable Parts
156
How To Obtain Parts
157
Manual Status Information
157
Newer Instruments
157
Service Centers
157
8840A Digital Multimeter
158
A1 Main Pca
163
Main Pca, Dc Scaling And F/R Switch
165
Display Pca
175
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Table of Contents
Troubleshooting
External Trigger Polarity Selection
130
Digital Controller Troubleshooting
136
Waveforms for In-Guard Troubleshooting Mode
138
DC Scaling Troubleshooting
143
Ohms Current Source Troubleshooting
144
A/D Converter Troubleshooting
146
Power Supply Troubleshooting
147
IEEE-488 Interface Troubleshooting
149
True RMS AC Troubleshooting
151
Internal Cleaning
153
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