Fluke 8840A User Manual

Table of Contents
I
SECTION
TITLE PAqE
In-Guard Microcomputer .................................................. 5-10
Function and Range Control .............................................. 5-15
AD Control and Computation ............................................ 5-15
Calibration Correction .................................................... 5-16
KeyboardDilay Control .................................................' 5-15
Troubleshooting Modes ................................................... 5-15
Guard-Crossing Communication ............................................ 5-15
GUARD CROSSING ....................................................... 5-15
POWER SUPPLY ......................................................... 5-1P
IEEE-488 INTERFACE (OPTION -05) ....................................... 5-18
Out-Guard
Microcomputer ................................................ 5-18
Guard Crossing ......................................................... 5-18
Bus Interface Circuitry ................................................... 5-18
Signal Conditioning ...................................................... 5-18
IEEE-488 Interface Power Supply .......................................... 5-19
TRUE RMS AC (OPTION -09) .............................................
5-18
VAC Scaling ........................................................... 5-19
mA AC Scaling ......................................................... 5-19
Frequency Response Trimming ............................................ 5-19
True RMS AC-to-DC Conversion .......................................... 5-18
6 Maintenance .................................................................... 6-1
6.1 . INTRODUCTION .......................................................... 6-1
....................................................
6-2 PERFORMANCE TEST 6-1
6-3
. Diagnostic Self-Tests ..................................................... 6-1
6-4
. DC Voltage Test ........................................................ 6-1
6-5
. AC Voltage Test (Option -09 Only) ....................................... 6.3,
6-6
. Resistance Test ......................................................... 6-4
6.7
. DC Current Test ........................................................ 6-5'
6-8
. AC Current Test (Option -09 Only) ....................................... 6-6
. 6-9 CALIBRATION ........................................................... 6.6,
6-10
. Basic Calibration Procedure ............................................... 6-61
6-11
. INITIAL PROCEDURE ................................................ 6-7
6-12
. \ A/D CALlBRAnON .................................................. 6-7
6.13
. OFFSET AND GAIN CALIBRATION ................................... 6-7
6-14
. HIGH-FREQUENCY AC CALIBRATION ................................ 6-9
6.15
. Advanced Features and Special Considerations ............................... 6-10
6.16
. STORING VARIABLE INPUTS ........................................ 6-19
6-17
. CALIBRATING INDMDUAL RANGES ................................. 6-10
6-18
. VERIFYING CAJJBRATION ........................................... 6-1 ;1
6-19 . ERASING CALIBRATION MEMORY ................................... 6-lp
6-20 . TOLERANCE CHECK ................................................ 6-12
6-21
.
AC CALIBRATION AT OTHER FREQUENCIES .........................
6-22 . OPTIMIZING USE OF THE 5450A ..................................... 6-1
6-23
.
3
Remote Calibration ...................................................... 6-13
6-24
. TIMING CONSIDERATIONS .......................................... 6-l$
6.25
. REMOTE ERASURE .................................................. 6-15
6-26 . EXAMPLE CALIBRATION PROGRAM ................................. 6-16
.
6-27 DISASSEMBLY PROCEDURE .............................................. 6-16
6-28
. Case Removal .......................................................... 6-17
.
6-29 True RMS AC PCA Removal (Option -09) ................................. 6-lj
.
6.30 IEEE-488 Interface PCA Removal (Option -05 Only) ......................... 6-17
6-31
. Main PCA Removal ..................................................... 6-17
.
6-32 Front Panel Disassembly ................................................. 6-22
.
6.33 REASSEMBLY PROCEDURE ............................................... 6-2E
.
6.34 INTERNAL FUSE REPLACEMENT ......................................... 6-2k
.
6.35 EXTERNAL TRIGGER POLARITY SELECI1ON (Option -05 Only) ............. 6-25
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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