FLUKE 1625-2 Advanced Geo Earth Ground Tester Kit User Manual

FLUKE 1625-2 Advanced Geo Earth Ground Tester Kit User Manual

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 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.

Introduction

The 1623-2 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 1623-2 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 128 Hz

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

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.

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
• Use the Product only as specified, or the protection supplied by the Product can be
• Do not use the Product if it operates
• Do not use the Product if it is
• Do not use test leads if they are damaged. Examine the test leads for damaged insulation, exposed metal, or if the wear indicator Check test lead continuity.
• Do not use the Product around explosive gas, vapor, or in damp or wet
• Do not apply more than the rated voltage, between the terminals or between each terminal and earth
• Use only current probes, test leads, and adapters supplied with the
• 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
• The battery door must be closed and locked before you operate the
• Replace the batteries when the low battery indicator shows to prevent incorrect
• Do not connect directly to
• Do not touch voltages >30 V ac rms, 42 V ac peak, or 60 V dc.

Table 1 is a list of symbols used on the Tester and in this manual.
Table 1. Symbols

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.

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.

Models and Accessories

These standard accessories were shipped with your Tester:

• 6 alkaline AA – type (LR6) batteries
• 2 measuring leads 5 m
• 1 connector cable (for RA 2-pole measurements)
• 2 alligator clips
• 1 Documentation CD with Users Manual
• Quick Reference Guide
• Safety Information

Table 2. Models and Accessories ****

Description

| Part Number
---|---
1623-2 Earth Ground Tester

(Includes Users Manual, Safety Information, QRG, Geox Probe Cable, 2 clips, Lead set)

|

4325155

1623-2 Earth Ground Tester Kit

(Includes Users Manual, Safety Information, QRG, Geox Probe Cable, 2 clips, Lead set, 4 Earth Stakes, 3 Cable Reels, C1620 Carrying Case, EI-162X & EI- 162AC)

|

4325170

162x-7001 Service Replacement Kit (Includes Lead set & 2 clips)

| 2577167
Earth Stake|

4325492

ES-162P3-2 Stake Set for 3 Pole Measurement

(Includes 3 Earth Stakes, 1 Cable Reel 25M Blue, 1 Cable Reel 50M Red)

|

4359377

ES-162P4-2 Stake Set for 4 Pole Measurement

(Includes 4 Earth Stakes, 1 Cable Reel 25M Blue, 1 Cable Reel 25M Green, 1 Cable Reel 50M Red)

|

4359389

EI-1623 Selective/Stakeless Clamp Set for 1623-2/1625-2 (Includes EI-162X, EI- 162AC)

| 2577115
EI-162X Clip-on Current Transformer (sensing) with shielded cable set|

2577132

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
Cable Reel, 25M, Blue wire|

4343731

Cable Reel, 25M, Green wire

| 4343746
Cable Reel, 50M, Red wire|

4343754

C1620 Carrying Case

|

4359042

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. Transformer half (2)
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.
3. Transformation ratio connections: ⊥, 200, 500, and 1000
4. Fastener (2)

Features

Typical applications for the Tester include:

• Earth/ground resistance measurements in different installations, such as, high voltage pylons, buildings, electrical service grounding systems, mobile communication stations, and HF transmitters.
• Monitor and plan lightning protection systems
• Resistance measurements with earth electrodes; no separation See Table 3 for a list of features and functions.

Table 3. Features and Functions

Display

The LCD is a 1999-digit display with special symbols and digit height of 25 mm. See Table 4 for location and description of each display element.
Table 4. Display

RS>Limit: Probe resistance too high

Setup

Warning
Read the safety information before you power on the instrument. If you have problems, see How to Troubleshoot.

Batteries

Warning

To prevent possible electrical shock, fire, or personal injury:

• The battery door must be closed and locked before you operate the
• Replace the batteries when the low battery indicator shows to prevent incorrect
• Batteries contain hazardous chemicals that can cause burns or If exposure to chemicals occurs, clean with water and get medical aid.

Warning
For safe operation and maintenance of the Product:

• Repair the Product before use if the battery
• Be sure that the battery polarity is correct to prevent battery

To insert the batteries:

1. Switch off instrument, see Figure
2. Disconnect all test
3. Open battery
4. Insert Always replace the complete set of batteries.
5. Close battery compartment.

Figure 2. Battery Insertion

Description of Functions

The functions are selected with the central rotary switch. Measurement values are shown on a liquid crystal display with correct decimal point and unit. Additional special characters indicate measurement mode, operating condition, and error messages.

The Tester includes these measurement functions:

• Earthing Resistance (R E) The earthing resistance is determined by a 3-pole 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 (R E )

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.

• Low Battery Indicator Battery voltage is low, replace

Operation

The Tester is equipped with a 3-pole as well as a 4-pole resistance measurement that renders measurements of resistances of earthing systems and measurements of the soil resistivity of geological strata. The Tester also makes measurements with an external current transformer, with which a measurement of single resistance branches in interlinked networks (lightning protection and high voltage pylons with cabling) can be performed without separating parts of the system.

RA 2-Pole, 3-Pole Measurements

To make 2-pole or dead-earth measurements, connect a jumper between terminals H/C2 and S/P2 with the supplied connector cable. Use only the earth electrode and the auxiliary earth electrode. Minimum distance between earth electrode (E/CD1) and auxiliary earth (H/C2) should be at least 20 m.
See Figures 3 and 4 and do steps 1 thru 4:

1. Select 3 POLE.

2. Connect the test
   Connect terminal E/C1 to the earth/ground system to be measured with the supplied test lead and clip (1.5 m). Place two ground stakes in earth/dirt.
   Note
   Minimum distance between earth electrode (E/C1), probe (S/P2), and auxiliary earth (H/C2) should be at least 20 m.
   Connect the stakes with the 25 m and 50 m cable reels to H/C2 and S/P2 as shown in Figures 3 and 4.

3. Push START.
   indicates that a measurement is in progress. For a continuous measurement, continue to push the START button.

4. active indicates a completed measurement. The result is kept on the display until a new measurement is started or the main switch is turned.

Figure 3. RA 2-Pole Measurement

Figure 4. RA 3-Pole Measurement

RA 4-Pole Measurements

To make 4-pole measurements:

1. Select 4 POLE function. See Figure 5.

2. Connect test leads.
   Connect terminals E/C1 and ES/P1 to the earth system to be measured with the two supplied test leads (1.5 m). Place two ground stakes in earth/dirt. Minimum distance between earth electrode (E/C1), probe (S/P2), and auxiliary earth (H/C2) should be at least 20 m. The ES test lead eliminates the influence of the test leads.
   Connect the stakes with the 25 m and 50 m cable reels to H/C2 and S/P2 as shown below.

3. Push START.  indicates that a measurement is in progress. For a continuous measurement, continue to push the START button.

4. indicates a completed measurement. The result is kept on the display until a new measurement is started or the rotary switch is turned.

Figure 5. RA 4-Pole Measurements

RA 3-Pole Selective Earth Resistance Measurement with Current Clamp

The RA 3-pole Selective Earth Resistance Measurement with Current Clamp procedure is useful for the resistance measurement of different parallel sections of an earth/ground system

1. Select 3 POLE . See Figure 6.

2. Connect test leads.
   Connect the supplied test lead (1.5 m) to terminal E/C1 and its other end to the ground system to be measured. Place two ground stakes in earth/dirt. Minimum distance between earth electrode (E/C1), probe (S/P2) and auxiliary earth (H/C2) should be at least 20 m.
   Connect stakes with 25 m and 50 m wires to H/C2 and S/P2 as shown.
   Connect current clamp with adapter cable as shown.

3. Push START.  indicates that measurement is in progress. For continuous measurement, continue to push the START button.

4. indicates completed measurement. The result is kept on display until a new measurement is started or the rotary switch is turned.

Figure 6. RA 3-Pole Selective Earth R esistance Measurement with Current Clamp

RA 4-Pole Selective Earth Resistance Measurement with Current Clamp

The RA 4-pole Selective Earth Resistance Measurement with Current Clamp procedure is useful for the resistance measurement of different parallel sections of an earth/ground system.

1. Select function 4 POLE . See Figure 7.

2. Connect test leads.
   Connect terminals E/C1 and ES/P1 with the supplied safety test leads (1.5 m) to the earth electrode to be measured. Place two ground stakes in earth/dirt.
   Minimum distance between earth electrode (E/C1), probe (S/P2) and auxiliary
   earth (H/C2) should be a minimum 20 m. The  test lead eliminates the influence of the test leads.
   Connect stakes with 25 m and 50 m wires to H/C2 and S/P2 as shown.
   Connect current clamp with adapter cable as shown.

3. Push START.
   indicates that measurement is in progress. For continuous measurement, continue to push the START button.

4. indicates completed measurement. The result is kept on display until a new measurement is started or the rotary switch is turned.

Figure 7. RA 4-Pole Selective Earth Resistance Measurement with Current Clamp

Stakeless Ground Loop Measurement

With this test method, two clamps are placed around the earth ground rod or the connecting cable and each are connected to the Tester. Earth ground stakes are not used. A known voltage is induced by one clamp, and the current is measured with the second clamp. The tester automatically determines the ground loop resistance at this ground rod.

1. Select . See Figure 8.

2. Connect current clamps.
   Connect the inducing clamp (see Models and Accessories) to terminals H/C2 and E/C1 with the supplied safety test leads (1.5 m) as shown.
   Note
   Use the recommended current clamp for inducing only.
   Other current clamps are not suited.
   Connect the second current clamp using the adapter cable (sensing current clamp).
   Clamp both current clamps around the earth electrode, which will subsequently be measured.
   Note
   Minimum distance between the two current clamps is 10 cm.

3. Push START.
   indicates that measurement is in progress. For continuous measurement, continue to push the START button.

4. indicates completed measurement. The result is kept on display until a new measurement is started or the rotary switch is turned.

Figure 8. Stakeless Ground Loop Measurement

Advanced Operation

The Tester uses advanced features to measure earth resistance of a single high voltage pylon and soil resistivity for calculation and design of earthing systems.

Measurements on High Voltage Pylons

The measurement of the earth resistance of a single high voltage pylon usually requires the overhead earth wire to be disengaged (lifted off) or the separation of the earthing system from the pylon construction. Otherwise, false reading of the resistance of the pylon earth electrode are liable to occur because of the parallel circuit of the other pylons connected to each other by an overhead earth wire.
The new measuring method employed in this instrument – with its external current transformer to measure the true current flowing through the earth electrode – allows measurements of earth electrode resistances without disconnection of the earthing system or disengaging the overhead earth wire. See Figure 9.

Figure 9. Earthing Resistance without Disengaging the Overhead Earth Wire

As all four pylon stubs are connected to the foundation earth of the pylon, the measuring current Imeas is divided into five components according to the present resistances
involved.
One part flows via pylon construction to the overhead earth wire and further to the parallel circuited pylon earthing resistances.
The other four current components (I1… I4) flow via the individual pylon foots.
The addition of all currents result in a current IE going through the earthing resistance, for example, the resistance of the “composite” earth electrode to the soil.
If the current transformer is fixed to each pylon stub, one after the other, four resistances have to be measured which show a behavior inversely proportional to the corresponding current components I1 … I4. The feeding point of the measuring current is to be left unchanged to avoid a change in the current distribution.
Accordingly, these equivalent resistances are displayed as:

Therefore the earthing resistance RE of the pylon is determined as a parallel circuit of the individual equivalent resistances:

1. Turn central rotary switch to position ì RE 3pole” or RE 4pole”. The instrument is to be wired according to picture and messages on the display.

2. Apply current transformer to the pylon stub.

3. Push START.
   Now a fully automated test sequence of all relevant parameters like auxiliary earth electrode, probe and earth electrode resistances is implemented and finishes with the display of the result RE.

4. Read out measured value RE.
   Note
   Before setting the earth stakes for probe and auxiliary earth electrode make sure that the probe is set outside the potential gradient of earth electrode and auxiliary earth electrode. Such a condition is normally reached by allowing a distance of >20 m between the earth electrode and the earth stakes as well as to the earth stakes to each other. An accuracy test of the results is made with another measurement after repositioning of auxiliary earth electrode or probe. If the result is the same, the distance is sufficient.
   If the measured value changes, probe or auxiliary earth electrode must be repositioned until the measured value RE remains constant.
   Stake wires should not run too close.

5. Apply current transformer to next pylon stub.

6. Repeat measuring sequence.
   Current feeding point of measuring current (alligator clip) and the polarity of the split core current transformer has to be left unchanged.
   After values of REi of all pylon foots are determined, the actual earth resistance RE has to be calculated:
   

If the displayed RE value is negative despite correct orientation of the current transformer, a part of the measuring current is flowing upwards into the tower body. The earthing resistance, thus coming into effect, correctly calculates if the individual equivalent resistances (under observation of their polarity) are inserted into the equation above.

Measurement of Soil Resistivity

The soil resistivity is the geological and physical quantity for calculation and design of earthing systems. The measuring procedure shown in Figure 10 uses the method developed by Wenner (F. Wenner, A method of measuring earth resistivity; Bull. National Bureau of Standards, Bulletin 12 (4), Paper 258, S 478-496; 1915/16).

Figure 10. Measurement of Soil Resistivity

1. Four earth stakes of the same length are positioned into the soil in an even line and with the same distance “a” to each other. The earth stakes should not be hammered in deeper than a maximum of 1/3 of “a”.

2. Turn central rotary switch to position “RE 4pole”.
   The instrument is to be wired according to picture and notices given on the display.

3. Push START.

4. Read out measured value RE.

From the indicated resistance value RE, the soil resistivity calculates according to the equation:

The measuring method according to Wenner determines the soil resistivity down to a depth of approx. the distance “a” between two earth stakes. By increasing “a”, deeper strata can be measured and checked for homogeneity. By changing “a” several times, a profile can be measured from which a suitable earth electrode can be determined.
According to the depth to be measured, “a” is selected between 2 m and 30 m. This procedure results in curves depicted in the graph below.

Curve 1: As ρE decreases only deeper down, a deep earth electrode is advisable
Curve 2: As ρE decreases only down to point A, an increase in the depth deeper than A does not improve the values.
Curve 3:
With increasing depth ρE is not decreasing: a strip conductor electrode is advisable.
As measuring results are often distorted and corrupted, for example, by underground pieces of metal and underground aquifers, a second measurement, in which the stake axis is turned by an angle of 90 °, is always advisable (see graph below).

Export Stored Data to PC
Test data is automatically stored for all tests as a .csv file. Table 5 is an example of the .csv file.
To export data from the Tester to a PC:

1. Connect the USB cable from the Tester to the PC.
2. Use Windows Explorer on the PC to find new EGT drive in the Devices list.
3. Locate the Data.csv file on the EGT drive.
4. Use the standard PC tools to copy the file to a new location.

Table 5. Sample .CSV File for Logged Data

**Measurement| Timestamp| Measurement Mode| Earth Ground Resistance R E| Error Status**
---|---|---|---|---
1| 15th Oct 2013 20:13:55| 3-pole RE| 1.022 W| NA
2| 15th Oct 2013 20:13:55| 4-pole RE| 1.022 W| NA
3| 15th Oct 2013 20:13:55| 3-pole Selective| 1.022 W| NA
4| 15th Oct 2013 20:13:55| 4-pole RE| NA| Rh Limit

Delete Stored Data

To delete stored data in the Tester:

1. Connect the USB cable from the Tester to the PC.
2. Use Windows Explorer on the PC to find new EGT drive in the Devices list.
3. Locate the Data.csv file on the EGT drive.
4. Use the standard PC tools to delete the file from the EGT drive or move the file to a new location.

This action removes all stored date from the Tester.

How to Troubleshoot

Follow the steps in Table 6. See Figure 11 for steps 1-5.
Table 6. Troubleshooting

If the external voltage applied to the instrument is too high, usually from leakage currents in the system under test, no measurement can be started (see Specifications for Uext limit). Hint: Reposition probe (S/P2) and restart measurement.
2.| Auxiliary earth electrode resistance (RH) too high
If the auxiliary earth electrode resistance is too high it is not possible to drive the current necessary for reliable measurements. The measurement is blocked (see Specifications for Rh limit). Hint: Check connection of test lead with terminal H/C2, check auxiliary earth stake.
3.| Probe resistance (Rs) too high
If the probe resistance is too high measurements are not reliable. The measurement is blocked (see Specifications for Rs limit). Hint: Check connection of test lead with terminal S/P2, check probe stake.
4.| Weak batteries
If the batteries are weak, the supply voltage may break down during measurement. If there is enough energy to complete the measurement “    ” symbol is displayed – measurement results are valid. If not, a reset occurs. Hint: Replace batteries. Use 6 alkaline AA-type (LR6) batteries.
5.| Is your R A measurement result reliable?
Probe S/P2 must be outside the potential gradient areas of E/C1 and H/C2 for accurate measurements. Normally a probe distance of more than 20 m is sufficient. However, in some environmental conditions where the soil resistivity is variable, this may not be sufficient. To be sure, reposition the probes and take several measurements. If the readings are approximately the same, your measurement results are reliable. If not, increase the probe distance.
6.| Is the result of a “Stakeless ground loop measurement” reliable?
** Ensure that you have the correct inducing clamp (see Accessories ).The clamp parameters are suited for this test method. An undefined clamp will give incorrect results.Ensure that the recommended minimum distance between the current clamp is kept. If the clamps are positioned too close together, the magnetic field of the inducing clamp will influence the sensing current clamp. To avoid mutual influencing, the distance between the clamps can be varied and a new test performed. If the measurement values vary only a little or not at all, the value can be regarded as reliable.

Figure 11. Troubleshooting

Maintenance

If used and treated properly, the instrument needs no maintenance. To clean the instrument, use only a moist cloth with some soap water or soft household detergent or spirit. Avoid aggressive cleaning agents and solvents, such as trilene or chlorothene.

Service work must only be undertaken by trained qualified staff.

In all repair work care must be taken that the design parameters of the instrument are not modified to the detriment of safety, that assembled parts correspond to the original spares and that they are reassembled properly (factory state).
Warning
To prevent possible electrical shock, fire, or personal injury:

• Use only specified replacement
• Have an approved technician repair the
• The battery door must be closed and locked before you operate the
• Replace the batteries when the low battery indicator shows to prevent incorrect
• Batteries contain hazardous chemicals that can cause burns or If exposure to chemicals occurs, clean with water and get medical aid.
• Remove the input signals before you clean the

Warning
For safe operation and maintenance of the Product:

• Repair the Product before use if the battery
• Be sure that the battery polarity is correct to prevent battery

Calibration

One-year calibration intervals are recommended.

Service

If you suspect that the Tester has failed, review this manual to make sure you are operating it correctly. If the meter still fails to operate properly, pack it securely (in its original container if available) and forward it, postage paid, to the nearest Fluke Service Center. Include a brief description of the problem. Fluke assumes NO responsibility for damage in transit.

To locate an authorized service center, go to www.fluke.com.

Specifications

Temperature ranges

Operating temperature range: 0 °C to +35 °C (+32 °F to +95 °F)
Storage temperature range: -20 °C to +60 °C (-4 °F to +140 °F)
Temperature coefficient: ±0.1 % of rdg / °C (below 18 °C and above 28 °C)
Operating humidity: <95 % RH noncondensing
Operating altitude: 2000 m
Climatic class: C1 (IEC 654-1), -5 °C to +45 °C, 5 % to 95 % RH
Protection type
Case: IP56
Battery door : IP40
Electromagnetic compatibility: Complies with IEC61326-1: Portable
Safety: Complies with IEC 61010-1: CAT None, Pollution Degree 2
External voltage: Uext, max = 24 V (dc, ac < 400 Hz), measurement inhibited for higher values
Noise rejection: >120 dB (162/3, 50, 60, 400 Hz)
Measurement time: 6 seconds, typical
Maximum overload: 250 Vrms (pertains to misuse)
Batteries: 6 x 1.5 v, AA, LR6 Alkaline
Battery life span: >3000 measurements, typical
Dimensions: 240 mm x 180 mm x 110 mm (9.5 in x 7.1 in x 4.4 in)
Weight with batteries: 1.49 kg (3.28 lb)
Memory: Internal memory storage up to 1500 records accessible via USB port

RA 3-Pole and 4-Pole ground resistance measurement __

Note

For 2-pole measurements, connect terminals H and S with the supplied connector cable. __

Measurement principle: Current and voltage measurement Measurement
voltage: Um = 48 V ac
Short-circuit current: > 50 mA ac
Meas. frequency : 128 Hz
Probe resistance (R S): max 100 kW Auxiliary earth electrode resistance (RH):max 100 kW
Additional error from R H and RS : RH[kW] ž RS[kW]/Ra[W] ž 0.2 %
RA 3-Pole and 4-Pole selective ground resistance measurement with current clamp (RA )

Measurement principle: Current/voltage measurement (with external current clamp)
Measurement voltage: Um = 48 V ac
Short-circuit current: > 50 mA ac
Measurement frequency: 128 Hz
Probe resistance (Rs): max 100 kΩ
Auxiliary earth electrode resistance (Rh): max 100 kΩ

Measuring principle: Stateless measurement of resistance in closed loops using two current clamps

References

• Fluke Registration
• Fluke Corporation: Fluke Electronics, Calibration and Networks

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