Fluke 45 User Manual
Page 6
45
Users Manual
ii
Measuring Frequency......................................................................................... 3-8
Frequency Ranging........................................................................................ 3-8
Frequency Measurement Rates...................................................................... 3-9
Measuring Frequency of Current (100 mA and 10A) Inputs......................... 3-9
Frequency Sensitivity Selection .................................................................... 3-9
Selecting A Function Modifier .......................................................................... 3-10
REL (Relative Readings) Modifier................................................................ 3-11
dB (Decibels and Audio Power) Modifier..................................................... 3-12
HOLD (Touch Hold) Modifier ...................................................................... 3-13
MN MX (Minimum Maximum) Modifier..................................................... 3-13
Using Function Modifiers in Combination.................................................... 3-13
Selecting A Measurement Rate (Rate) .......................................................... 3-14
Using the
S Button .................................................................................... 3-14
Using The Compare (Comp) Function............................................................... 3-16
The List and Number Editors ........................................................................ 3-16
Using the List Editor ..................................................................................... 3-17
Using the Number Editor............................................................................... 3-18
Power-Up Configuration.................................................................................... 3-19
Factory Settings of Power-Up Configuration ................................................ 3-19
Changing the Power-Up Configuration ......................................................... 3-19
Calibration ......................................................................................................... 3-20
4
Applications........................................................................................ 4-1
Introduction........................................................................................................ 4-1
Using the Dual Display...................................................................................... 4-1
Using Measurement Functions in Combination ............................................ 4-2
Taking Voltage and Current Measurements Using the Dual Display ........... 4-2
Response Times ................................................................................................. 4-4
How the Meter Makes Dual Display Measurements ......................................... 4-5
Updating the Primary and Secondary Displays with a Single Measurement 4-5
Updating the Primary and Secondary Displays with Separate Measurements 4-5
Update Rate in the Dual Display Mode......................................................... 4-7
External Trigger ................................................................................................. 4-7
Thermal Voltages............................................................................................... 4-8
When Measuring Resistance.............................................................................. 4-9
Two-Wire Configuration ............................................................................... 4-9
Correcting for Test Lead Resistance ............................................................. 4-9
True RMS Measurements .................................................................................. 4-9
Effects of Internal Noise in AC Measurements............................................. 4-10
Calculated (AC + DC) RMS Measurements ................................................. 4-10
Waveform Comparison (True RMS vs. Average-Responding Meters) ........ 4-10
5
Operating the Meter Using the Computer Interface ......................... 5-1
Introduction........................................................................................................ 5-1
Local and Remote Operations ....................................................................... 5-1
Preparing the Meter for Operations via the RS-232 Interface ........................... 5-2
Setting Communication Parameters (RS-232)............................................... 5-2
RS-232 Print-Only Mode............................................................................... 5-3
Cabling the Meter to a Host or Printer (RS-232)........................................... 5-4
Character Echoing and Deletion.................................................................... 5-4
Device Clear Using ^C (CNTRL C).............................................................. 5-4
RS-232 Prompts............................................................................................. 5-4
Preparing the Meter to be Operated via IEEE-488 Interface ............................. 5-5
IEEE-488 Operating Limitations................................................................... 5-5