Introduction - Fluke 1625-2 User Manual

Introduction

The 1625-2 Earth Ground Tester (Tester or Product) is a compact, field-rugged
instrument that performs all four types of earth ground measurement. Specifically, the
Tester is able to measure earth ground loop resistances using only clamps – called
Stakeless testing. This method doesn't require the use of earth ground stakes or the
disconnection of ground rods.
The Tester features:
•
One-button measurement concept
•
3-pole and 4-pole earth ground measurement
•
4-pole soil resistivity testing
•
Selective testing, no disconnection of ground conductor (1 clamp)
•
Stakeless testing, quick ground loop testing (2 clamps)
•
Measuring frequency 94, 105, 111, 128 Hz
The Tester includes these advanced features:
•
Automatic Frequency Control (AFC) – identifies existing interference and chooses a
measurement frequency (94, 105, 111, 128 Hz) to minimize its effect, providing a
more accurate earth ground value.
•
R* measurement – calculates earth ground impedance at 55 Hz to more accurately
reflect the earth ground resistance that a fault-to-earth ground would see.
•
Adjustable limits – for quick test result verification.
At locations involving the generation, distribution and consumption of electrical energy,
certain safety measures must be met in order to protect human life. In many cases, these
safety measures are national and international regulations which must be checked
regularly. Grounding, the connection of exposed conductive parts to the earth in case of a
fault, represents the most fundamental safety measure. There are requirements for
grounding of transformers, high and medium voltage power pylons, railway tracks, tanks,
vats, foundations and lightning protection systems.
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