Fluke 8840A User Manual

Table of Contents
SECTION
TITLE
PAGE
3.58 . TIMING CONSIDERATIONS ............................................... 3-21
3.59
. IMMEDIATE MODE COMMANDS .......................................... 3-21
3-60
. EXAMPLE PROGRAMS ................................................... 3-21
4 Measurement Tutorial ........................................................... 4-1
4.1 . INTRODUCTION .......................................................... 4-1
4.2
. DC VOLTAGE MEASUREMENT ........................................... 4-1
4.3
. Circuit Loading Error .................................................... 4-1
4.4
. Input Bias Current Error ................................................. 4-1
4.5
. RESISTANCE MEASUREMENT ............................................ 4-2
4.6
. 2-Wire Ohms ........................................................... 4-2
4.7
.
Correcting for Test Lead Resistance in 2-Wire Ohms ........................ 4-2
4.8
. 4-Wire Ohms ........................................................... 4-3
4.9
. Applications of the Ohms Functions ....................................... 4-3
4.10
. TESTING DIODES ................................................... 4-4
4.11
. TESTING ELECTROLYTIC CAPACITORS .............................. 4-4
4.12
. A PRECISION CURRENT SOURCE .................................... 4-5
4.13
. DC CURRENT MEASUREMENT ........................................... 4-6
4.14
. REDUCING THERMAL VOLTAGES ........................................ 4-6
4.15
. AC VOLTAGE AND CURRENT MEASUREMENT ............................ 4-6
4.16
. True RMS Measurement ................................................. 4-6
4.17
. Waveform Comparison ................................................... 4-6
4.18
. Crest Factor ............................................................ 4-6
4.19
. AC-Coupled AC Measurements ............................................ 4-7
4.20
. Combined AC and DC Measurements ...................................... 4-9
4-2
1 . Bandwidth ............................................................. 4-9
4.22
. Zero-Input VAC Error ................................................... 4-9
5
Theory of Operation ............................................................. 5-1
.
........................................................
5.1 . INTRODUCTION ; 5-1
5.2
. OVERALL FUNCTIONAL DESCRIPTION .................................... 5-1
5.3
. DETAILED CIRCUIT DESCRIPTION ........................................ 5-1
5.4
. DC SCALING ............................................................ 5-1
5.5
. VDC Scaling ........................................................... 5-1
5.6
. VDC Protection ......................................................... 5-4
5.7
. m.4 DC Scaling ......................................................... 5-4
5.8
. Analog Filter ........................................................... 5-4
5.9
. TRACWHOLD CIRCUIT ................................................... 54
.....................................................
5.10 . Trackconfiguration 5-4
5.11
. Settling Configuration .................................................... 5-4
5.12
. Hold Configuration ...................................................... 5-4
5.13
. Pre-Charge Configuration ................................................. 5-4
5.14
. PRECISION VOLTAGE REFERENCE ....................................... 5-4
5.15
. OHMS CURRENT SOURCE ................................................ 5-5
5.16
. OHMS PROTECTION ..................................................... 5-5
5.17
. OHMS FUNCTIONS ....................................................... 5-8
5.18
. 2-Wire Ohms ........................................................... 5-8
5.19
. 4-Wire Ohms ........................................................... 5-8
5.20
. A/D CONVERTER ........................................................ 5-9
5.21
. TirninglData Control ..................................................... 5-11
5.22
. Precision DAC .......................................................... 5-12
5.23
. AD Amplifier .......................................................... 5-12
5.24
. Bootstrap Supplies ....................................................... 5-12
5.25
. DISPLAY 5-12
................................................................
.
5.26 KEYBOARD 5-13
..............................................................
5.27 . DIGITAL CONTROLLER .................................................. 5-13
iii
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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