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Fluke
Multimeter
8840A
Fluke 8840A User Manual
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4
6
Table of Contents
Section 1
8
Introduction and Specifications
6
Options and Accessories
6
Table of Contents
8
Introduction
10
Section 2
15
Operating Instructions
18
Introduction
18
Specifications
18
The 8840A Digital Multimeter
18
External Dimensions
25
Installing the Power-Line Fuse
26
Connecting to Line Power
26
Adjusting the Handle
26
Rack Mounting Kits
26
Operating Features
27
Front and Rear Panel Features
27
Power-Up Features
27
Line Voltage Selection Settings
27
Adjusting the Handle
27
Display Features
28
Error Messages
28
Overrange Indication
28
Rack-Mount Kits
28
Autorange
32
Continuous Trigger Mode
32
Diagnostic Self-Tests
32
External Trigger Mode
32
Manual Range
32
Ranging
32
Triggering
32
Automatic Settling Time Delay
34
External Trigger Input (Option -05 Only)
34
Reading Rates and Noise Rejection
34
Sample Complete Output (Option -05 Only)
34
Making Measurements
34
Input Overload Protection Limits
34
Overrange Indication
34
Measuring Voltage and Resistance
36
External Cleaning
36
Measuring Current
36
Remote Programming
38
Introduci'ion
38
Capabilities
38
Bus Set-Up Procedure
38
An Overview of Remote Operation
39
A Note about Examples
39
Device-Dependent Command Set
39
Bn (Offset Gommands)
39
IEEE-488 Address Seiection
39
Cn (Calibration Commands)
41
Fn (Function Commands)
41
Get Commands
43
G O (Get Instrument Configuration)
44
G1 (Get SRQ Mask)
44
G2 (Get Calibration Prompt)
44
Output Data Format
45
G3 (Get User-Defined Message)
46
G4 (Get Calibration Status)
46
G5 (Get IAB Status)
46
G6 (Get YW Status)
46
G7 (Get Error Status)
46
N (Numeric Entry Command)
47
Put Commands
47
P O (Put Instrument Configuration)
47
P2 (Put Calibration Value)
47
Sn (Reading Rate Commands)
49
Tn (Trigger Mode Commands)
49
Wn (Terminator Commands)
49
Trigger Selection Logic Diagram
50
ZO (Self-Test Command)
51
(Single-Trigger Command)
51
Input Syntax
51
Definitions
51
Input Processing
51
Syntax Rules
52
Interpretation of Messages
53
Output Data
54
Error Messages
54
Loading Output Data
54
Measurement Data
54
Numeric Data and Error Messages
54
Overrange Indication
54
Types of Output Data
54
Output Priority
55
Status Data
55
Service Requests
55
The Serial Poll Register
55
The SRQ Mask
55
Serial Poll Register
55
Interface Messages
56
Address Messages
56
Addressed Commands
56
Universal Commands
56
Talk-Only Mode
56
Timing Considerations
57
Example Program: Taking 10 Readings
58
Example Program: Taking Readings with Local Control
59
Example Programs: Using the IBM PC
62
Example Programs
72
DC Voltage Measurement
75
Circuit Loading Error
75
Input Bias Current Error
75
Introduction
75
Measurement Tutorial
75
Resistance Measurement
76
2-Wire Ohms
76
Circuit Loading Error Calculation
76
4-Wire Ohms
77
Applications of the Ohms Functions
77
Measuring Input Bias Current Error
77
Testing Diodes
78
Testing Electrolytic Capacitors
78
2-Wire Ohms Measurement
78
Aprecision Current Source
79
4-Wire Ohms Measurement
79
Ac Voltage and Current Measurement
80
DC Current Measurement
80
Reducing Thermal Voltages
80
AC-Coupled AC Measurements
81
Burden Voltage Error Calculation
81
Crest Factor
81
Waveform Comparison Chart
82
Bandwidth
83
Typical Crest Factors for Various Waveforms
83
Combined AC and DC Measurement
83
Combined AC and DC Measurements
83
Zero-Input VAC Error
83
Detailed Circuit Description
85
DC Scaling
85
VDC Scaling
85
Introduction
85
Overall Functional Description
85
Theory of Operation
85
DC Scaling (VDC and Rna DC)
87
VDC Protection
88
DC Scaling
88
Hold Configuration
88
Analog Filter
88
Pre-Charge Configuration
88
Precision Voltage Reference
88
Settling Configuration
88
Tracwhold Circuit
88
Ohms Current Source
89
Ohms Protection
89
2-Wire Ohms
92
Ohms Functions
92
Ohms Scaling
94
Display
96
Precision DAC
96
Keyboard
97
Function and Range Control
99
Calibration Correction
99
Troubleshooting Modes
99
Guard-Crossing Communication
99
Guard Crossing
100
Power Supply
101
Ieee-488 Interface (Option -05)
102
Out-Guard Microcomputer
102
Signal Conditioning
102
Frequency Response Trimming
103
IEEE488 Interface Power Supply
103
Ma AC Scaling
103
True Rms Ac (Option -09)
103
True RMS AC-To-DC Conversion
103
VAC Scaling
103
Maintenance
107
Introduction
107
Performance Test
107
Diagnostic Self-Tests
107
DC Voltage Test
107
AC Voltage Test (Option -09 Only)
109
Resistance Test
110
DC Current Test
111
AC Current Test (Option -09 Only)
112
Calibration
113
Initial Procedure
113
Offset and Gain Calibration
113
High-Frequency Ac Calibration
115
Advanced Features and Special Considerations
116
Storing Variable Inputs
116
Erasing Calibration Memory
117
Verifying Cajjbration
117
Ac Calibration at Other Frequencies
118
Optimizing Use of the 5450A
118
Tolerance Check
118
Remote Calibration
119
Remote Erasure
121
Example Calibration Program
122
Disassembly Procedure
122
Case Removal
123
True RMS AC PCA Removal (Option -09)
123
IEEE-488 Interface PCA Removal (Option -05 Only)
123
Main PCA Removal
123
Front Panel Disassembly
128
Reassembly Procedure
128
Internal Fuse Replacement
130
External Trigger Polarity Seleci1On
131
EXTERNAL TRIGGER POLARITY SELECTION (Option -05 Only)
131
Initial Troubleshooting Procedure
131
Troubleshooting
131
Diagnostic Self-Tests
135
Self-Test Descriptions
135
Digital Controller Troubleshooting
137
In-Guard Microcomputer System
137
In-Guard Microcomputer
138
Address Latch (U219)
139
External Program Memory (XU222)
139
Calibration Memory (U220)
139
Relay Buffer (U201)
139
3-To-8 Chip Select Decoder (U208)
140
8-Bit Digit Driver (U215)
140
3-To-8 Strobe Decoder (U213)
140
8-Bit Digit Driver (U218)
140
8-Bit Segment Driver (U217)
140
Display Control (U212)
140
Display System
140
Hex Inverter (U203)
140
Hex Inverter (U221)
140
Analog Control Signals
141
Keyboard Wiring
141
Quad or Gate ( ' 2 1 1)
141
Evaluating Dynamic Signals
142
Evaluating Static Signals
142
DC Scaling Troubleshooting
144
Ohms Current Source Troubleshooting
145
Power Supply Troubleshooting
148
IEEE-488 Interface Troubleshooting (Option -05)
150
Service Position
150
Diagnostic Program
151
Service Position
152
Major Problems
152
More Obscure Problems
153
Guard Crossing Troubleshooting
154
Internal Cleaning
154
Cleaning after Soldering
155
List of Replaceable Parts
157
Introduction
158
How to Obtain Parts
158
Manual Status Information
158
Newer Instruments
158
Service Centers
158
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Fluke 8840A Specifications
General
Frequency Range
20 Hz to 100 kHz
Operating Temperature
0°C to 50°C
Display
Vacuum Fluorescent
DC Current Range
0 to 2 A
AC Current Range
0 to 2 A
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