Each Fluke product is warranted to be free from defects in material and workmanship under normal use and
service. The warranty period is two years and begins on the date of shipment. Parts, product repairs, and
services are warranted for 90 days. This warranty extends only to the original buyer or end-user customer of
a Fluke authorized reseller, and does not apply to fuses, disposable batteries, or to any product which, in
Fluke's opinion, has been misused, altered, neglected, contaminated, or damaged by accident or abnormal
conditions of operation or handling. Fluke warrants that software will operate substantially in accordance
with its functional specifications for 90 days and that it has been properly recorded on non-defective media.
Fluke does not warrant that software will be error free or operate without interruption.
Fluke authorized resellers shall extend this warranty on new and unused products to end-user customers
only but have no authority to extend a greater or different warranty on behalf of Fluke. Warranty support is
available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the
applicable international price. Fluke reserves the right to invoice Buyer for importation costs of
repair/replacement parts when product purchased in one country is submitted for repair in another country.
Fluke's warranty obligation is limited, at Fluke's option, to refund of the purchase price, free of charge repair,
or replacement of a defective product which is returned to a Fluke authorized service center within the
warranty period.
To obtain warranty service, contact your nearest Fluke authorized service center to obtain return
authorization information, then send the product to that service center, with a description of the difficulty,
postage and insurance prepaid (FOB Destination). Fluke assumes no risk for damage in transit. Following
warranty repair, the product will be returned to Buyer, transportation prepaid (FOB Destination). If Fluke
determines that failure was caused by neglect, misuse, contamination, alteration, accident, or abnormal
condition of operation or handling, including overvoltage failures caused by use outside the product’s
specified rating, or normal wear and tear of mechanical components, Fluke will provide an estimate of repair
costs and obtain authorization before commencing the work. Following repair, the product will be returned to
the Buyer transportation prepaid and the Buyer will be billed for the repair and return transportation charges
(FOB Shipping Point).
THIS WARRANTY IS BUYER'S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY
OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. FLUKE SHALL NOT BE LIABLE
FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES,
INCLUDING LOSS OF DATA, ARISING FROM ANY CAUSE OR THEORY.
Since some countries or states do not allow limitation of the term of an implied warranty, or exclusion or
limitation of incidental or consequential damages, the limitations and exclusions of this warranty may not
apply to every buyer. If any provision of this Warranty is held invalid or unenforceable by a court or other
decision-maker of competent jurisdiction, such holding will not affect the validity or enforceability of any other
provision.
Fluke Corporation
P.O. Box 9090
Everett, WA 98206-9090
U.S.A.
Fluke Europe B.V.
P.O. Box 1186
5602 BD Eindhoven
The Netherlands
11/99
To register your product online, visit register.fluke.com.
14. Compensation of Measuring Lead Resistance ...................................................... 36
v
1625-2
Users Manual
vi 1
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)
•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.
1625-2
Users Manual
The effectiveness of grounding systems should be checked using a earth/ground tester
such as the 1625-2 which checks the effectiveness of connections to the ground. The
1625-2 provides the perfect solution by combining the latest technology into a compact,
field-rugged instrument. In addition to performing standard 3-pole and 4-pole ground
resistance measurements, an innovative process accurately measures individual earth
electrode resistances in single and meshed earthed systems without disconnecting any
parallel electrodes. One specific application of this capability is quick and accurate
measurement of power pylon grounds. The 1625-2 has automatic frequency control
(AFC) to minimize interference. Before measuring, the instrument identifies existing
interference and selects a measurement frequency to minimize its effect.
Notes
•The terms earth and earthing also refer to ground and grounding and is used
interchangeably throughout this manual.
•For stakeless earth resistance measurements, the Selective/Stakeless
Clamp Set (EI-1623) must be purchased. (The1625-2 Kit includes this
clamp set.)
•Selective measurements are described in the main section of this manual.
How to Contact Fluke
To contact Fluke, use one of these telephone numbers:
• USA: 1-800-760-4523
• Canada: 1-800-36-FLUKE (1-800-363-5853)
• Europe: +31 402-675-200
• Japan: +81-3-6714-3114
• Singapore: +65-6799-5566
• Anywhere in the world: +1-425-446-5500
Or, visit Fluke's website at www.fluke.com.
Go to www.fluke.com to register your product, download manuals, and find more
information.
To view, print, or download the latest manual supplement, visit
http://us.fluke.com/usen/support/manuals.
2
Earth/Ground Tester
Safety Information
Safety Information
A Warning identifies hazardous conditions and procedures that are dangerous to the
user. A Caution identifies conditions and procedures that can cause damage to the
Product or the equipment under test.
Warning
To prevent possible electrical shock, fire, or personal injury:
• Read all safety information before you use the Product.
• Use the Product only as specified, or the protection supplied by
the Product can be compromised.
• Do not use the Product if it operates incorrectly.
• Do not use the Product if it is damaged.
• Do not use test leads if they are damaged. Examine the test leads
for damaged insulation, exposed metal, or if the wear indicator
shows. Check test lead continuity.
•Do not use the Product around explosive gas, vapor, or in damp
or wet environments.
•Do not apply more than the rated voltage, between the terminals
or between each terminal and earth ground.
•Use only current probes, test leads, and adapters supplied with
the Product.
•Do not use a current measurement as an indication that a circuit
is safe to touch. A voltage measurement is necessary to know if a
circuit is hazardous.
•The battery door must be closed and locked before you operate
the Product.
•Replace the batteries when the low battery indicator shows to
prevent incorrect measurements.
• Do not connect directly to mains.
• Do not touch voltages >30 V ac rms, 42 V ac peak, or 60 V dc.
3
1625-2
Users Manual
Table 1 is a list of symbols used on the Tester and in this manual.
Table 1. Symbols
Symbol Description
Risk of Danger. Important information. See Manual.
Conforms to relevant Australian EMC requirements.
Storage
If the Tester is stored for an extended period of time or is not in use for a long time, you
should remove the batteries.
Hazardous voltage. Risk of electrical shock.
Battery Indicator
Conforms to European Union directives.
Conforms to relevant South Korean EMC Standards.
This product complies with the WEEE Directive (2002/96/EC) marking
requirements. The affixed label indicates that you must not discard this
electrical/electronic product in domestic household waste. Product Category:
With reference to the equipment types in the WEEE Directive Annex I, this
product is classed as category 9 "Monitoring and Control Instrumentation”
product. Do not dispose of this product as unsorted municipal waste. Go to
Fluke’s website for recycling information.
4
Earth/Ground Tester
Models and Accessories
Models and Accessories
These standard accessories were shipped with your Tester:
EI-1623 Selective/Stakeless Clamp Set for 1623-2/1625-2
(Includes EI-162X, EI-162AC)
EI-162X Clip-on Current Transformer (sensing) with shielded cable set2577132
EI-162AC Clip-on Current Transformer (inducing)2577144
EI-162BN Split Core Transformer - for Pylon Testing
(12.7 inch - 320 mm) 2577159
Shielded Cable (Used w/ EI-162X Clamp)2630254
4325181
2577167
4359389
2577115
Cable Reel, 25M, Blue wire4343731
Cable Reel, 25M, Green wire4343746
Cable Reel, 50M, Red wire4343754
C1620 Carrying Case4359042
5
1625-2
Users Manual
Additional Accessories
An external current transformer is available as an option, see Figure 1. The
transformer has a transformation ratio between 80 and 1200:1 for the measurement of a
single branch in mesh-operated earthing systems. This enables the user to measure on
high voltage pylons without separating the overhead earth wires or earth strips at the
bottom of the pylons. It is also used to measure lightning protection systems without
separating the individual lightning protection wires.
1
3
NORMA
1000
500
A 6805 06211
200
!
2
Figure 1. External Current Transformer EI-162BN
Transformer half (2)
Transformer end faces have bolts that pivot to aid in separating the Transformer
halves. One Transformer end face has a slotted bolt hole that allows the bolt to
pivot out of the end face.
Transformation ratio connections: ⊥, 200, 500, and 1000
Fastener (2)
evx01.eps
6
Earth/Ground Tester
Features
Features
The 1625-2 Earth/Ground Tester (Tester) is an earth resistance meter with fully
automated measuring frequency selection process. The Tester includes automatic testing
of probe and auxiliary earth electrode resistances and possible interference voltages in
accordance with DIN IEC61557-5/EN61557-5:
• Measurement of interference voltage (U
• Measurement of interference frequency (F
• Measurement of probe resistance (R
• Measurement of auxiliary earth electrode resistance (R
• Measurement of earthing resistance 3-pole, 4-pole, (R
external clip-on current transformer for selective measurement of single earthing
branches in mesh operated earthing systems
• Resistance measurement 2-pole with ac voltage (R~)
• Resistance measurement with dc voltage 2-pole, 4-pole, (R)
With its various possibilities of measurement and the fully automated measuring
sequence control (incl. automatic frequency control AFC), this instrument offers the latest
measuring technology in the field of earthing resistance measurements. By means of the
selectable limit input with visual and acoustical confirmation/error message and with the
code programmable and customer defined special functions, such as measuring voltage
20 V (for agricultural systems), earthing impedance R* (measuring frequency 55 Hz)
switched on or off, these instruments are individually programmable for use as a simple
meter as well as a high end fully automated measuring device.
)
ST
)
ST
)
S
)
H
) with or without using the
E
The Tester includes automatic testing of probe, auxiliary earth electrode resistances, and
possible interference voltages.
See Table 3 for a list of features and functions.
Warning
• No voltage permissible to sockets .
• Do not open or close the instrument with force.
• Disconnect all leads before opening the instrument.
7
1625-2
Users Manual
Table 3. Features and Functions
6
2
3
4
5
1
ST
12
Rear Side
1413
10
11
7
8
9
edw006.eps
No. Description
Rotary switch to select measurement function and ON/OFF
"START TEST" button to start the selected measurement function
"DISPLAY MENU" button to select the setting or show test data
"CHANGE ITEM" button to change the selected setting value
"SELECT" button to confirm the setting value
Liquid crystal display (LCD)
Connection "H/C2" for auxiliary earth (4 mm ø)
Connection "S/P2" for probe (4 mm ø)
Connection to sense current test clamp
Connection "ES/P1" for earth electrode probe (4 mm ø)
Connection "E/C1" for the earth/ground electrode to be measured (4 mm ø)
USB Type B Port
Battery compartment for 6 alkaline batteries (type AA, LR6)
Screws to fasten the battery compartment
8
Earth/Ground Tester
Display
Display
The display is a 4-digit (2999 Digit), 7 segment liquid crystal display (Table 4).
Table 4. Display Elements
1
10
11
9
2
3
4
8
6
7
5
edw004.eps
Item Description
Test Type
UST Interference voltage (AC + DC)
FST Frequency of interference voltage
FM Frequency of measuring voltage
UM Measuring voltage limit 20/48 V
RE Earthing resistance
R
Auxiliary earth electrode resistance
H
R
Probe resistance
S
R
Compensation resistance
K
R1, R2 Low voltage measurement with polarity indication
R ~ AC- resistance
R* Earthing impedance (measuring frequency 55 Hz)
Measurement
Measurement Unit: V, Ω, kΩ, Hz
Symbols Key
Recognition of current transformer socket
Socket recognition
Measuring circuit ( E-S,E-H ) interrupted or measured value unstable
Error
Measuring sequence in process
Limit value/Limit value exceeded
Warning for exceeded limit
Battery level indicator
9
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