Fluke 1625 User Manual
Earth/Ground Tester
Users Manual
®
1625
January 2006
© 2006 Fluke Corporation, All rights reserved. Printed in USA
All product names are trademarks of their respective companies.
LIMITED WARRANTY AND LIMITATION OF LIABILITY
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 enduser 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
Table of Contents
Title Page
Introduction .......................................................................................... 1
Models and Accessories........................................................................ 3
Safety Instructions ................................................................................ 4
Qualified Staff .................................................................................. 5
Setup..................................................................................................... 5
Unpacking......................................................................................... 5
Checking the Scope of Delivery ....................................................... 5
General ................................................................................................. 6
Additional Accessories ......................................................................... 6
Assembly .............................................................................................. 7
Description of Functions....................................................................... 7
Measurement of Interference Voltage (UST) ..................................... 8
Measurement of Interference Frequency (FST).................................. 8
Measurement of Earthing Resistance (RE)........................................ 9
Selective Measurement of Earthing Resistance (RE A) ................ 9
Resistance Measurement (R~) .......................................................... 9
Low Resistance Measurement (RF)................................................. 9
Checking for Correct Measuring Connection ................................... 9
Beeper............................................................................................... 9
LO-BAT............................................................................................ 10
Specifications........................................................................................ 10
Measurement of Interference Voltage DC + AC (UST) ..................... 13
Measurement of Interference Frequency (FST).................................. 13
Earthing Resistance (RE)................................................................... 13
Selective Measurement of the Earthing Resistance (REA)............ 17
Resistance Measurement (R~) .......................................................... 18
Resistance Measurement (RF)......................................................... 19
Compensation of Lead Resistance (RK) ............................................ 20
Description of the Operating Elements ................................................. 21
Description of Display Elements ...................................................... 23
Procedure of Measurements.................................................................. 24
POWER ON Functions ................................................................. 25
Operation ...................................................................................... 26
Checking of Correct Measuring Connection (Socket Allocation). 30
Safety Control Measurements....................................................... 31
i
1625
Users Manual
Measurement of Interference - Voltages and Frequencies................ 31
Measurement of Earthing Resistances.............................................. 32
Measurement of Soil Resistivity....................................................... 45
Measurement of Resistances ............................................................ 48
Changing of All Data Settings with Personalized CODE................. 51
Description of Displays........................................................................ 55
Care and Maintenance.......................................................................... 60
Replacing Batteries........................................................................... 61
Recalibration .................................................................................... 62
Storage.............................................................................................. 62
Specifications ....................................................................................... 64
Principle of Operation .......................................................................... 65
Purpose............................................................................................. 65
Operation.......................................................................................... 68
Applications ..................................................................................... 70
3-pole/4-pole Measurement of Earthing Resistance..................... 33
Measurement of Single Earth Electrode Resistances in
Mesh Operated Earthing Systems Using Selective Clamp
Method ......................................................................................... 36
3-pole/4-pole Measurement of Single Earth Electrode
Resistances ................................................................................... 37
Measurements on High Voltage Pylons........................................ 39
Correcting Clip-on Transformer Errors ........................................ 42
Compensation of Earth Electrode Connecting Lead..................... 44
Resistance Measurement (R~)...................................................... 48
Resistance Measurement (RF)..................................................... 49
Compensation of Measuring Lead Resistance.............................. 50
Storing a Code.............................................................................. 53
Deleting a Code............................................................................ 54
Settings on the Tester ................................................................... 69
Description of Displays................................................................ 72
ii
List of Tables
Table Title Page
1. Models and Accessories................................................. 3
2. Electrical Measurement Specifications .......................... 14
3. Description of Displays.................................................. 56
iii
1625
Users Manual
iv
List of Figures
Figure Title Page
1. Fluke 1625 Earth/Ground Tester.................................... 2
2. Description of Functions ................................................ 8
3. Display ........................................................................... 10
4. Operating Elements........................................................ 21
5. Display Elements ........................................................... 23
6. Operational Modes ......................................................... 27
7. Measurement of Interference -
Voltages and Frequencies............................................... 32
8. Earthing Resistances Measurement - Method ................ 33
9. 3-pole/4-pole Measurement of Earthing Resistance -
Process............................................................................ 34
10. Earth Resistance - Maximum Permissible Value ........... 35
11. Measurement of Single Earth Electrode Resistances in
Mesh Operated Earthing Systems .................................. 36
12. 3-pole/4-pole Measurement of Single Earth
Electrode Resistances..................................................... 37
13. Measuring the Earthing Resistance without
Disengaging the Overhead Earth Wire........................... 40
14. Correcting Clip-on Transformer Errors.......................... 43
15. Compensation of Earth Electrode Connecting Lead ...... 44
16. Measurement of Soil Resistivity .................................... 45
17. Resistance Measurement (R~) ....................................... 48
18. Resistance Measurement (RF) ...................................... 49
19. Evaluation of Measured Value....................................... 50
20. Compensation of Measuring Lead Resistance ............... 51
v
1625
Users Manual
vi
Earth/Ground Tester
Introduction
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.
The effectiveness of grounding systems should be checked using a ground test
instruments such as the 1625 which checks the effectiveness of connections to
the ground. The 1625 provides the perfect solution by combining the latest
technology into a compact, field-rugged and extremely easy to use instrument.
In addition to performing standard 3- 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 also incorporates
automatic frequency control (AFC) to minimize interference. Before measuring, the instrument identifies existing interference and selects a measurement
frequency to minimise its effect. The 1625 incorporates microprocessor controlled automatic measurements including checking probe hookup to ensure
that measurements are taken correctly. It measures all probe ground resistances
to ensure reliable, repeatable results. Probe resistance and auxiliary earth resistance are also measured and displayed.
1
1625
Users Manual
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 EI-1625 must
be purchased. (The EI-1625 comes standard with the 1625 Kit).
Refer to Appendix A for a complete set of operating information
including specifications.
• Selective measurements are described in the main section of this
manual.
Figure 1 displays the Fluke 1625 Earth/Ground Tester:
EARTH / GROUND TESTER
1625
START
TEST
ST
H/C2
2
DISPLAY
MENU
CHANGE
ITEM
SELECT
Earth/Ground Resistance 300 k
RA
4
POLE
3
POLE
4
POLE
3
POLE
OFF
AC
Resistance
300 k
R
2
POLE
DC Low Resistance 3k
2
POLE
S/P2
R
4
POLE
ES/P1
E/C1
Figure 1. Fluke 1625 Earth/Ground Tester
edw001.eps
Earth/Ground Tester
Models and Accessories
Models and Accessories
Table 1 lists the models and accessories.
Table 1. Models and Accessories
Description Item/Part Number
Earth Ground Tester - Basic
(Includes manual, 2 leads and 2 clips)
Earth Ground Tester - Fully Loaded
(Includes manual, 2 leads and 2 clips,
ES162P4, EI-1623)
Service Replacement Kit
(Includes 2 Leads, 2 Clips)
Stake Set for 3 Pole Measurement
(Includes three stakes, one 25 m cable
reel, one 50 m cable reel)
Stake set for 4 Pole Measurement
(Includes four stakes, two 25 m cable
reels, one 50 m cable reel)
Selective/Stakeless Clamp Set for
1625. (Includes EI-162X and EI162AC and 2-3 wire adapter cable)
Clip-on Current Transformer (sensing)
with shielded cable set
Shielded Cable (Used w/EI-162X
Clamp)
Clip-on Current Transformer (inducing) EI-162AC
12.7 Inch (320mm) Spilt Core Transformer
2-3 Wire Adapter Cable for 1625 for EI162AC Current Transformer
Earth Stake 2539121
Cable Reel w/25m Wire 2539100
Cable Reel w/50m Wire 2539117
1625 Users Manual 2560348
Fluke-1625
Fluke-1625 Kit
Fluke-162x-7001
ES-162P3
ES-162P4
EI-1625
EI-162X
2539195
EI-162BN
2577171
3
1625
Users Manual
Safety Instructions
W Warning
This measuring equipment is only to be operated by qualified staff and in accord with its technical data in compliance with the safety precautions and instructions set forth
below. In addition, use of this equipment requires compliance with the legal and safety instructions pertaining to
the specific application in question. Similar precuations
apply to the use of accessories.
Caution
Operation of electrical equipment inevitably causes certain
parts of such equipment to carry dangerous voltage. Noncompliance with precautions may therefore cause major
physical or material damage.
Fault-free and reliable operation of this instrument requires suitable transport
and storage, setting-up and assembly, as well as care in operation and maintenance.
If there is reason to believe that risk-free operation is no longer possible, the
instrument should be switched off immediately and protected against accidental restarting. Risk-free operation shall be deemed to be no longer possible if
and when the instrument
• shows visible damage,
• fails to work in spite of functioning batteries,
• has been exposed for some time to unfavorable conditions ( e.g. stor-
age beyond the permissible climatic limits without adaptation to the
ambient climate, dewing etc.),
• has been exposed to major strain during transport ( e.g. been dropped
from some height without visible external damage etc.), or
• shows " E1 ... E5 " on the display.
4
Earth/Ground Tester
Setup
Qualified Staff
Consists of persons familiar with the setting up, assembly, starting up and operation of the product and possess the qualifications required for such activities, such as
• training, instruction and/or authorization to perform the following op-
erations on circuits and equipment according to safety engineering
standards: switching on and off, disconnecting, earthing/grounding,
labeling;
• training or instructions according to safety engineering standards in
the care and main tenance of adequate safety equipment.
• training in rendering first aid.
Setup
Unpacking
Check delivery for damage during transport. Keep the packing material for
later transport and check scope of delivery.
Checking the Scope of Delivery
Upon unpacking immediately check the accessories for missing parts. The accessories supplied are listed on page 2.
Caution
Although the instrument is easy to operate please read
these operating instructions carefully for safety reasons
and in order to make optimum use of the instrument.
The measuring functions are only all activated when the instrument is connected.
5
1625
Users Manual
General
Microprocessor controlled universal earth resistance meter with fully automated measuring frequency selection process as well as automatic testing of
probe- and auxiliary earth electrode resistances and possible interference voltages as per 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 3pole, 4pole, (R
)
ST
)
ST
)
S
)
H
) with or without
E
using the external clip-on current transformer for selective measurement of single earthing branches in mesh operated earthing systems
A
• Resistance measurement 2pole with AC voltage (R~)
• Resistance measurement with DC voltage 2pole, 4pole, (RF)
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 accoustical
confirmation/error message and with the code programmable and customer
defined special functions, e.g. measuring voltage 20 V (for agricultural systems), earthing impedance R* (measuring frequency 55 Hz) switched on or off
etc., these instruments are individually programmable for use as a simple meter
as well as a high end fully automated measuring device.
Additional Accessories
An external current transformer with a transformation ratio between 80 and
1200:1 for the measurement of a single branch in mesh operated earthing systems is available as an option and enables the user to measure on high voltage
pylons without seperating the overhead earth wires or earth strips at the bottom
of the pylons and also to measure lightning protection systems without seperating the individual lightning protection wires.
6
Earth/Ground Tester
Assembly
Assembly
The instrument is made up of two parts:
1. The base part which contains the measuring electronics.
2. The protective housing.
The functions are selected with the central rotary switch. Four rubber buttons,
which start measurements, read out supplementary measuring values and select
special functions, are located on the left hand side of the front panel. This design enables quick and clear one-hand operation.
The measured values are displayed on a liquid crystal display with correct
decimal point and unit. Various additional special characters indicate measuring mode, operating condition and error messages.
The auxiliary power supply consists of 6 x 1.5 V batteries (IEC R6 or LR6 or
type AA).
This device has been developed, designed and manufactured in compliance
with quality system DIN ISO 9001.
Description of Functions
The following flowchart presents a description of the functions of the 1625
Earth/Ground Tester.
7
1625
Users Manual
EXT
H
S
ES
E
Switching
Voltage
measurement
ADC
Comp
Current
measurement
Processor
Relais
driver
Source
driver
Rotary selector
switch buttons
LCD
Undervoltage
detection
Display
Supply
voltage
edw003.eps
Figure 2. Description of Functions
Measurement of Interference Voltage (UST)
Fullwave rectification for DC and AC (DC without operational sign, AC signal
sinus calibrated for r.m.s. values). If limit values are exceeded no measurement
will be started.
Measurement of Interference Frequency (FST)
For interference voltage >1 V its frequency is derived from the period time.
8
Earth/Ground Tester
Description of Functions
Measurement of Earthing Resistance (RE)
The earthing resistance is determined by a 3- or 4-pole current and voltage
measurement. The measuring voltage is a square pulse AC voltage with 48 /
20 V and a frequency of 94, 105, 111 or 128 Hz. The frequency can be selected
manually or automatically (AFC).
Selective Measurement of Earthing Resistance (RE
Measurement of a single earth electrode in a mesh operated (parallel) earthing
system. The current flowing through the single earth electrode is measured
with an external current transformer.
A
)
Resistance Measurement (R~)
The resistance is determined by a 2 pole current and voltage measurement. The
measuring voltage is a square pulse AC voltage with 20 V and a frequency of
94, 105, 111 or 128 Hz. The frequency can be selected manually or automatically (AFC).
Low Resistance Measurement (RF)
The resistance is determined by DC current and voltage measurement. 2- as
well as 4-pole measurement is possible. The short circuit current is > 200 mA.
The resistance of both current directions is measured and stored.
Checking for Correct Measuring Connection
The processor checks if the measuring lead is properly connected according to
the selected function via isolated, two piece contacts, inside of each 4 mm (banana) input socket, in combination with detection circuitry. A wrong or missing connection is indicated by an optical or acoustical signal.
Beeper
The built in beeper has two functions:
1. Giving messages if set limit values are exceeded.
2. Indicating dangerous conditions or maloperation.
Controlling is done by means of the microprocessor.
9
1625
Users Manual
LO-BAT
Supervision of the battery charge status is done with a comparator circuit. Via
microprocessor, a drop in battery capacity down to typ. 10 % of its specified
value is indicated on the display with symbol LO-BAT.
Specifications
General: Microprocessor controlled, fully automated earth
measuring instrument with additional functions
Measuring function: interference voltage and frequency, earthing resis-
tance 3- and 4-pole with / without clip-on current
transformer, resistance 2-pole with AC, 2- and 4-pole
with DC
Display
(see Figure 4):
ST
4 digit (2999 Digit) - 7 segment liquid crystal display,
digit size 18 mm with supplementary signs and active
illumination.
edw004.eps
Figure 3. Display
10
Earth/Ground Tester
Specifications
Operation: Central rotary switch and function keys
Working temperature range: -10 °C … +50 °C
Operating temperature range: 0 °C … +35 °C
Nominal temperature range: 18 °C … +28 °C
Storage temperature range: -30 °C … +60 °C
Note
The chart of four temperature ranges for the instrument exist to satisfy European Standards requirements; the instrument can be used
over the full Working temperature range by using the temperature coefficient to calculate accuracy at the ambient temperature of use.
Temperature coefficient: ± 0.1 % of range / Kelvin
Operating errors: refer to operating temperature range and RH
< 20 RE, RS < 100 RE
The maximum percentage operating error within the measurement range does
not exceed ± 30 % with the measured value as fiducial value, as determined in
accordance with TABLE 1.
The operating error applies under the rated operating conditions given in
IEC1557-1 and the following:
• injection of series interference voltages with system frequencies of
400 Hz, 60 Hz, 50 Hz, 16
2
/3 Hz or with d.c. voltage respectively
across the terminals E (ES) and S. The r.m.s. value of the series interference voltage shall be 3 V;
• resistance of the auxiliary earth electrode and of the probes: 0 to 100 x
but ≤ 50 kΩ;
R
A
• system voltages between 85 % and 110 % of the nominal voltage and
between 99 % and 101 % of the nominal system frequency for measuring equipment with a mains supply and/or measuring equipment deriving its output voltage directly from the distribution system.
Limits of error: refer to nominal temperature range
Climate class: C1 (IEC 654-1), -5 °C...+45 °C, 5 %...95 % RH
Type of protection: IP 56 for case, IP 40 for battery door according to
EN 60529
11
1625
Users Manual
Max voltage:
Urms = 0 V
Sockets ” E ES S H " to each other in any com-
EMC (Emission Immunity):
Quality standard: developed, designed and manufactured to comply
External field influence:
Auxiliary power: 6 x 1,5 V alkali-manganese-batteries (IEC
Battery life span: with IEC LR6/type AA: typ. 3000 measurements
with IEC LR6/type AA : typ. 6000 measurements
Dimensions: 240 mm (W) x 220 mm (D) x 90 mm ( H )
Weight: ≤ 1.1 kg without accessories
Wsocket A to socket EFGH
bination, max. Urms= 250 V (pertains to misuse)
IEC 61326-1:1997 Class A
with DIN ISO 9001
complies with DIN 43780 (8/76)
LR6 or type AA )
(RE+R
(RE + R
≤ 1 kΩ)
H
>10 kΩ)
H
≤ 5.5 kg incl. accessories and batteries in carrying
case
Case material: NORYL, shock -and scratch proof thermoplast
12
Earth/Ground Tester
Specifications
Measurement of Interference Voltage DC + AC (UST)
Measuring method: fullwave rectification
Measuring
Range
1…50 V 0.0…50 V 0.1 V DC/AC
Display
Range
Resolu-
tion
Frequency
Range
45…400 Hz
sine
Limits of Er-
ror
± (5% of
reading +5
digit)
Measuring sequence: approx. 4 measurements /s
Internal resistance:
Max. overload:
approx. 1.5 MΩ
U
= 250 V
rms
Measurement of Interference Frequency (FST)
Measuring method: Measurement of oscillation period of the interfer-
ence voltage
Measuring
Range
16.0 … 400
Hz
Display Range Resolution Range
16.0…299.9…99
9 Hz
0.1 … 1 Hz 1 V …
50 V
Limits of
Error
± (1% v. mv
+2 digit)
Earthing Resistance (RE)
Measuring method: current and voltage measurement with probe
as IEC61557-5
Open circuit voltage: 20 / 48 V, AC
Short circuit current: 250 mA AC
Measuring frequency: 94 , 105 , 111 , 128 Hz selected manually or
automatic.(AFC) 55 Hz in function R*
Noise rejection: 120 dB ( 16 2/3, 50 , 60, 400 Hz )
Max. overload: U
13
= 250 V
rms
1625
Users Manual
Intrinsic Er-
ror or Influ-
ence Quan-
tity
Table 2. Electrical Measurement Specifications
Requirements
Reference Con-
ditions or Speci-
fied Operating
Range
Designation
Code
or Test in Ac-
cordance with
the Relevant
Parts of
IEC 1557
Type
of
Test
Intrinsic error Reference condi-
A Part 5, 6.1 R
tions
Position Reference posi-
E1 Part 1, 4.2 R
tion
± 90°
Supply voltage
At the limits
stated by the
E2 Part 1, 4.2,
4.3
manufacturer
Temperature 0 °C and 35 °C E3 Part 1, 4.2 T
Series interference volt-
See 4.2 and 4.3 E4 Part 5, 4.2,
4.3
age
Resistance
of the probes
and auxiliary
0 to 100 x R
but ≤ 50 kΩ
A
E5 Part 5, 4.3 T
earth electrodes
System frequency
99 % to 101 % of
the nominal fre-
E7 Part 5, 4.3 T
quency
System voltage
85 % to 110 % of
the nominal volt-
E8 Part 5, 4.3 T
age
R
T
Operating
error
14
Part 5, 4.3 R
282726252423222
15,1( EEEEEEEEAB +±=
1
Earth/Ground Tester
Specifications
A = intrinsic error
En = variations
R = routine test
T = type test
[]
%B ±=
B
valuefiducial
100% x
Measuring
Range
0.001 Ω...2.999 Ω 0.001 Ω
3.00 Ω...29.99 Ω 0.01 Ω
0.020 Ω 30.0 Ω...299.9 Ω 0.1 Ω
300 kΩ 0.300 kΩ...2.999 kΩ 1 Ω
3.00 kΩ...29.99 kΩ 10 Ω
30.0 kΩ...299.9 kΩ 100 Ω
Display Range Resolution
Instrinsic
Error
± ( 2 % of
mv +2 digit )
Max. Op-
erating
Error
± ( 5% of
mv +5
digit )
Measuring time: typ. 8 sec. with a fixed frequency
30 sec. max. with AFC and complete cycle of all
measuring frequencies
Additional error because of
probe-and auxiliary earth
electrode resistance:
Measuring error of RH and
RR
SH
R
E
typ. 10 % of
)2000(
Ω+
RRR ++
6
−
HsE
+××
digits
5%1025.1
RS:
Max. probe resistance: ≤ 1 M Ω
Max. auxiliary earth elec-
≤ 1 M Ω
trode resistance:
Automatic check if error is kept within the limits required by IEC61557-5.
If after a measurement of probe-, auxiliary earth electrode- and earthing resistance, a measurement error of higher than 30 % is assumed because of the in-
15
1625
R
Users Manual
fluencing conditions (see diagramm), the display shows a warning symbol W
and a notice that RS or RH are too high.
F
%0001
%001
%01
%1
0
%1,
1 01
k
1 00
k01
3
k001
0001000
E
00
H
=R/R
3
0
01
3
0
01
3
1
3,0
S
M
1
edw005.eps
Automatic switchover of measuring resolution in dependence to auxiliary earth
electrode resistance R
:
H
RH with Umeas = 48 V RH with Umeas = 20 V Resolution
< 300 Ω < 250 Ω 1 mΩ
< 6 kΩ < 2,5 kΩ 10 mΩ
< 60 kΩ < 25 kΩ 100 mΩ
< 600 kΩ < 250 kΩ 1 Ω
16
Earth/Ground Tester
Specifications
Selective Measurement of the Earthing Resistance
(R
A
)
E
Measuring method: Current and voltage measurement with probe as per
EN61557-5 and current measurement in the individual
branch with additional current transformer (patent applied for).
Open circuit volt-
20 / 48 V AC
age:
Short circuit current: 250 mA AC
Measuring frequency:
94, 105, 111, 128 Hz selected manually or automatically (AFC), 55 Hz (R
*
)
Noise rejection: 120 dB (16 2/3 , 50 , 60 , 400 Hz)
Max. overload: max. Urms = 250 V (measurement will not be started)
Measuring
Range
0.001...2.999 Ω 0.001 Ω
3.00...29.99 Ω 0.01 Ω
0.020 Ω... 30.0...299.9 Ω 0.1 Ω
30 kΩ 0.300...2.999 kΩ 1 Ω
3.00...29.99 kΩ 10 Ω
Display Range Resolution
Intrinsic
Error *
± (7 % of
m.v. +2
digit)
Operating
Error *
± (10% of m.v.
+5 digit)
* With recommended current clamps / transformers.
Additonal error because
of probe- and auxiliary
earth typ.electrode resis-
RR
R
SH
ETOTAL
)2000(
Ω+
6
−
+××
digits
5%1025.1
tance:
Measuring error of RH
and RS:
Measuring time:
typ.of 10% of
RRR ++
HSETOTAL
typ. 8 sec. with a fixed frequency 30 sec.max.
with AFC and complete cycle of all measuring
frequencies
17
1625
Users Manual
Minimal current in single
0.5 mA with transformer (1000:1)
branch to be measured:
Max. interference current
through transformer:
0.1 mA with transformer (200:1)
3 A with a transformer (1000:1)
Resistance Measurement (R~)
Measuring method: current and voltage measurement
Measuring voltage: 20 V AC, square pulse
Short circuit current: > 250 mA AC
Measuring frequency: 94, 105, 111, 128 Hz selected manually or auto-
matically (AFC)
Measuring
Range
0.001 Ω ... 2.999 Ω 0.001 Ω
3.0 Ω ... 29.99 Ω 0.01 Ω
0.020 Ω... 30 Ω ... 299.9 Ω 0.1 Ω
300 kΩ 300 Ω ... 2999 Ω 1 Ω
Display Range Resolution
Intrinsic
Error
± ( 2 %
of m.v.
+2 digit )
Operating
Errors
± ( 5% of m.v.
+5 digit )
3.0 kΩ ... 29.99 kΩ 10 Ω
30.0 kΩ ... 299.9 kΩ 100 Ω
Measuring time: typ. 6 sec.
Max. interference voltage: 24 V, with higher voltages measurement will not
be started
Max overload: Urms max. = 250 V
18
Earth/Ground Tester
Specifications
Resistance Measurement (RF)
Measuring method: current- voltage measurement as per IEC61557-4
possible
Open circuit voltage: 20 V DC
Short circuit current: 200 mA DC
Formation of measured
value:
with 4-pole measurement wires on H, S, ES can
be extended without additional error.
Resistances >1 Ω in wire E can cause additional
error of 5m Ω/Ω.
Measuring
Range
0.001 Ω ... 2.999 Ω 0.001 Ω
0.020 Ω 3.0 Ω ... 29.99 Ω 0.01 Ω
3 kΩ 30.0 Ω ... 299.9 Ω 0.1 Ω
300 Ω ... 2999 Ω 1 Ω
Display Range Resolution Intrinsic
Error
±( 2 % of
m.v. +2
digit)
Operating
Error
±( 5% of
m.v. +5
digit)
Measuring sequence: approx. 2 measurements/s
Measuring time: typ. 4 sec. incl. reversal of polarity (2 pole or 4
pole)
Max. interference voltage: ≤ 3 V AC or DC, with higher voltages measure-
ment will not be started
Max inductivity: 2 Henry
Max. overload: Urms = 250 V
19
Loading...