Fluke Portable Multimedia Player 8842a Manual De Usuario

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Contents 
(continued)
iii
3-50.
The Serial Poll Register ................................................................... 3-27
3-51.
The SRQ Mask................................................................................. 3-28
3-52.
INTERFACE MESSAGES .................................................................. 3-29
3-53.
Address Messages ............................................................................ 3-29
3-54.
Universal Commands ....................................................................... 3-29
3-55.
Addressed Commands...................................................................... 3-30
3-56.
TALK-ONLY MODE .......................................................................... 3-30
3-57.
REMOTE CALIBRATION.................................................................. 3-31
3-58.
TIMING CONSIDERATIONS ............................................................ 3-31
3-59.
IMMEDIATE MODE COMMANDS .................................................. 3-31
3-60.
EXAMPLE PROGRAMS .................................................................... 3-32
4
Measurement Tutorial........................................................................ 4-1
4-1.
INTRODUCTION ................................................................................ 4-2
4-2.
DC VOLTAGE MEASUREMENT ..................................................... 4-2
4-3.
Circuit Loading Error ....................................................................... 4-2
4-4.
Input Bias Current Error................................................................... 4-3
4-5.
RESISTANCE MEASUREMENT ...................................................... 4-4
4-6.
2-Wire Ohms.................................................................................... 4-4
4-7.
Correcting for Test Lead Resistance in 2-Wire Ohms ..................... 4-5
4-8.
4-Wire Ohms.................................................................................... 4-5
4-9.
Applications of the Ohms Functions................................................ 4-7
4-10.
TESTING DIODES ..................................................................... 4-7
4-11.
TESTING ELECTROLYTIC CAPACITORS ............................ 4-7
4-12.
A PRECISION CURRENT SOURCE......................................... 4-8
4-13.
DC CURRENT MEASUREMENT ..................................................... 4-8
4-14.
REDUCING THERMAL VOLTAGES ............................................... 4-9
4-15.
AC VOLTAGE AND CURRENT MEASUREMENT ........................ 4-10
4-16.
True RMS Measurement .................................................................. 4-10
4-17.
Waveform Comparison .................................................................... 4-10
4-18.
Crest Factor ...................................................................................... 4-12
4-19.
AC-Coupled AC Measurements ...................................................... 4-12
4-20.
Combined AC and DC Measurements ............................................. 4-13
4-21.
Bandwidth ........................................................................................ 4-13
4-22.
Zero-Input VAC Error...................................................................... 4-13
4-23.
MAKING ACCURATE MEASUREMENTS ON THE 20 mV
AND 20
 RANGES ............................................................................ 4-14
4-24.
MAKING ACCURATE HIGH-RESISTANCE MEASUREMENTS . 4-15
5
Theory of Operation........................................................................... 5-1
5-1.
INTRODUCTION ................................................................................ 5-3
5-2.
OVERALL FUNCTIONAL DESCRIPTION ...................................... 5-3
5-3.
DETAILED CIRCUIT DESCRIPTION .............................................. 5-4
5-4.
DC SCALING ...................................................................................... 5-4
5-5.
VDC Scaling .................................................................................... 5-6
5-6.
VDC Protection................................................................................ 5-7
5-7.
mA DC Scaling ................................................................................ 5-7
5-8.
Analog Filter .................................................................................... 5-7
5-9.
TRACK/HOLD CIRCUIT ................................................................... 5-8
5-10.
Track Configuration ......................................................................... 5-10
5-11.
Settling Configuration...................................................................... 5-11
5-12.
Hold Configuration .......................................................................... 5-11
5-13.
Pre-Charge Configuration ................................................................ 5-11
5-14.
PRECISION VOLTAGE REFERENCE.............................................. 5-11