Contents (continued)
iii
4 Motor Loads................................................................................ 37
Introduction .................................................................................. 37
Induction Motors........................................................................... 38
Checking Voltage Imbalance .................................................. 38
Checking Current and Current Imbalance............................... 40
Measuring 3-Phase Balanced Power...................................... 42
Measuring Peak and Inrush Current ....................................... 44
Measuring Power Factor of 3-Phase Motors........................... 47
Grounded Y-Connection with Balanced Load..................... 47
Delta connection or floating systems.................................. 48
Measuring Voltage Harmonics................................................ 50
Adjustable Speed Drives.............................................................. 51
Checking Current on Phases .................................................. 51
Measuring Fundamental of Motor Voltage .............................. 52
Measuring Frequency of Motor Current................................... 53
5 Scope Mode................................................................................ 55
Introduction .................................................................................. 55
Basic One Channel Measurement ............................................... 56
Set Up Selection .......................................................................... 57
Viewing Signal Details.................................................................. 59
Triggering..................................................................................... 61
Return to Auto Mode.................................................................... 62
Dual Channel Measurement ........................................................ 63
Single Mode................................................................................. 67
6 Handling Screens and Data....................................................... 67
Introduction .................................................................................. 67
Saving Screens............................................................................ 68
Viewing and Deleting screens...................................................... 68
Printing Screens........................................................................... 70
Creating Reports.......................................................................... 71
Recording Harmonics over Time.................................................. 72
7 Definitions................................................................................... 75
Index
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