METREL MI 3290 User Manual

MI 3290 Earth Analyser Table of contents
6
11.7 Earth Potential [Us] ................................................................................... 101
11.7.1 Potential Measurement ...................................................................... 102
11.7.2 Step and Touch Voltages Theory ...................................................... 106
11.8 Pylon Ground Wire Test (PGWT) ............................................................. 108
11.8.1 PGWT Measurement ......................................................................... 108
11.9 Current [I] .................................................................................................. 110
11.9.1 Iron Clamp Meter RMS Measurement ............................................... 111
11.9.2 Flex Clamp Meter RMS Measurement ............................................... 112
11.10 Voltage [V] ................................................................................................ 113
11.10.1 Voltage Meter RMS Measurement..................................................... 113
11.11 Checkbox .................................................................................................. 114
11.11.1 Check V - Meter Measurement .......................................................... 115
11.11.2 Check A - Meter Measurement .......................................................... 116
11.11.3 Check Iron, Flex Clamps Measurement ............................................. 117
12 Auto Sequences® ........................................................................................... 118
12.1 Selection of Auto Sequence® ................................................................... 118
12.2 Organization of Auto Sequence® ............................................................. 119
12.2.1 Auto Sequence® view menu ............................................................. 119
12.2.2 Step by step executions of Auto Sequence® ..................................... 121
12.2.3 Auto Sequence® result screen .......................................................... 122
12.2.4 Auto sequence memory screen ......................................................... 124
13 Communication ............................................................................................... 125
14 Maintenance .................................................................................................... 126
14.1 Cleaning .................................................................................................... 126
14.2 Periodic calibration ................................................................................... 126
14.3 Service ...................................................................................................... 126
14.4 Upgrading the instrument .......................................................................... 126
15 Technical specifications ................................................................................. 127
15.1 Earth [Ze] .................................................................................................. 127
15.1.1 2, 3, 4 - pole ....................................................................................... 127
15.1.2 Selective (Iron Clamp) ....................................................................... 128
15.1.3 2 Clamps ........................................................................................... 129
15.1.4 Passive (Flex Clamps 1-4) ................................................................. 129
15.1.5 HF Earth Resistance (25 kHz) ........................................................... 130
15.1.6 Selective (Flex Clamps 1 - 4) ............................................................. 131
15.2 Specific Earth Resistance Measurements [ρ] ........................................... 132
15.2.1 Wenner and Schlumberger method ................................................... 132
15.3 Earth Potential [Us] ................................................................................... 133
15.3.1 Potential ............................................................................................. 133
15.3.2 S&T Current Source .......................................................................... 133
15.4 Impulse Impedance [Zp] ........................................................................... 134
15.4.1 Impulse Measurement ....................................................................... 134
15.5 DC Resistance [R] .................................................................................... 135
15.5.1 Ω - Meter (200mA) ............................................................................. 135
15.5.2 Ω - Meter (7mA) ................................................................................. 136
15.6 AC Impedance [Z] ..................................................................................... 137
15.6.1 Impedance Meter ............................................................................... 137
15.7 Current [I] .................................................................................................. 137

METREL MI 3290 Specifications

General

Brand	METREL
Model	MI 3290
Category	Measuring Instruments
Language	English