
Megohmmeter Models 6550/6555
3
4.4 Insulation Measurements..................................................................................................................... 28
4.4.1 Description of the Measurement Principle ................................................................................ 28
4.4.2 Using a Fixed Voltage................................................................................................................ 29
4.4.3 Using a Variable Voltage............................................................................................................ 29
4.4.4 Using a Voltage Ramp............................................................................................................... 30
4.4.5 Using a Stepped Voltage........................................................................................................... 31
4.4.6 Connection ................................................................................................................................ 32
4.4.7 Before the Insulation Measurement .......................................................................................... 33
4.4.8 During the Insulation Measurement .......................................................................................... 34
4.4.9 After the Insulation Measurement ............................................................................................. 36
4.5 Error Indications................................................................................................................................... 37
4.6 DAR (dielectric absorption ratio) and PI (polarization index) ............................................................... 37
4.6.1 DAR/PI Measurement................................................................................................................ 38
4.6.2 Interpretation of the Results...................................................................................................... 39
4.7 DD (dielectric discharge index) ............................................................................................................ 40
4.7.1 DD Measurement ...................................................................................................................... 40
4.7.2 Interpretation of Results............................................................................................................ 41
4.8 Capacitance Measurement.................................................................................................................. 42
4.9 Measurement of the Residual Current ................................................................................................. 42
5. MEMORY FUNCTION .......................................................................................... 43
5.1 Recording a Measurement................................................................................................................... 43
5.2 Reading Recorded Values.................................................................................................................... 45
5.3 Erasing the Memory............................................................................................................................. 47
5.3.1 Erasing One Record .................................................................................................................. 47
5.3.2 Erasing All Records ................................................................................................................... 48
5.4 Error Codes.......................................................................................................................................... 48
6. DATAVIEW®SOFTWARE ..................................................................................... 49
6.1 Installing DataView............................................................................................................................... 49
6.2 Connecting the Instrument to the PC .................................................................................................. 52
6.3 Megohmmeter Control Panel............................................................................................................... 52
6.3.1 Opening the Control Panel........................................................................................................ 52
7. SPECIFICATIONS ............................................................................................... 53
7.1 Reference Conditions .......................................................................................................................... 53
7.2 Electrical Specifications....................................................................................................................... 53
7.2.1 Voltage....................................................................................................................................... 53
7.2.2 Current....................................................................................................................................... 53
7.2.3 Insulation Resistance ................................................................................................................ 53
7.2.4 DAR, PI, and DD........................................................................................................................ 58
7.2.5 Capacitance .............................................................................................................................. 58
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