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Gossen MetraWatt GEOHM 5 User Manual Download Page 13

GEOHM 5 

 

Instrument description 

 

13 

Step 2 

 

 

Set the function switch to 

R

EARTH

 position, the following menu will be displayed: 

 

 

 

Figure 7. Earth Resistance initial menu 

 
 

Step 3 

 

 

Press  START  key  and  view  the  test  result.  (If  you  want  to  perform 
more  than  one  measurement  press  the 

START

  key  and  keep  it 

pressed until the result has stabilized, then release the key. The last 
result will stay displayed.) 

 

Press  the  DISP  key  to  check  the  resistances  of  both  the  potential 
(

Rp)

, and the current (

Rc)

 test probes. After a short period

 

the main 

result will automatically be displayed again. 

 

 

Store the displayed result for documentation purposes, see instructions on how to 
use memory in chapter 3.1.1. Storing of test results. 

 
 

Notes! 

 

 

When an external voltage higher than 20 Vac/dc. is present between H and E or 
ES and S test terminals, the Earth Resistance measurement will not be carried out 
after pressing 

START

 key, but the message 

> 20 V

 will be displayed, marked with  

!

 symbol!  

 

If a noise voltage higher than approx. 5 V is present between the H and E or ES and 
S test terminals, a cursor mark pointing to the 

“

” (noise) symbol will be 

displayed, indicating that the test result may not be correct! 

 

If the resistance of the current or potential rod is too high (>(4 k 

 + 100 R

E

) or 

>50 k

, whichever is lower), then the test result will be marked with 

 symbol and 

the cursor will appear on 

Rc

 and / or 

Rp

.  

 

If the test result is out of measurement range (open test leads), 

>19,99 k

 

message will be displayed! 

Summary of Contents for GEOHM 5

Page 1: ...User Manual GEOHM 5 Earth Tester 3 349 418 03 3 12 20 ...

Page 2: ...blication may be reproduced or utilized in any form or by any means without permission in writing from Gossen Metrawatt GmbH Protection class II device Warning concerning a point of danger Attention observe documentation Warning regarding dangerous electrical voltage This device may not be disposed of with the trash Further information regarding the WEEE mark can be accessed on the Internet at www...

Page 3: ...surement with two test clamps 16 2 7 Specific Earth Resistance 19 2 8 Current True RMS 22 3 Memory and other operations 24 3 1 Memory 24 3 1 1 Storing of test results 25 3 1 2 Recalling of stored results 26 3 1 3 Erasing stored results 28 3 2 RS 232 communication 29 3 3 Reset of the instrument 30 4 Maintenance 31 4 1 Batteries 31 4 2 Cleaning 32 4 3 Recalibration 32 4 4 Service 33 4 5 Device Retur...

Page 4: ...hnology which requires practically no service intervention A custom designed LC display offers easy to read main results as well as subresults parameters and messages Application is simple and clear and the operator does not need to attend any special training except to read this Instruction Manual to operate the instrument 1 2 Warnings In order to ensure operator safety while carrying out various...

Page 5: ...er improved by means of averaging The frequency and algorithm once set will stay set even after replacing batteries Insert the frequency of mains voltage 50 60 Hz Setting the unit of Specific Earth Resistance parameter m ft Setting the measuring algorithm Switch OFF the instrument Keep ON key pressed while switching on the instrument until Fr followed by 50 or 60 value last selected starts to flas...

Page 6: ...eters measured by the Earth Tester Parameter Function switch position Used accessories Earth Resistance RE classic four lead method REARTH Four test terminals Two test rods Selective Earth Resistance Rs classic four lead method plus test sensitive clamp Rs clamp Four test terminals Two test rods One sensitive test clamp Selective Earth Resistance RE two test clamps RE 2 clamps Two test clamps Eart...

Page 7: ... in the general specifications The casing consists of a main section which includes the operator s panel and connectors and of a moveable cover The cover is permanently fixed to the base section and cannot be detached 2 2 Front panel The front panel consists of a custom LCD a rotary switch and a keyboard see the figure below mA M Vk m ft Hz MEM 1 Figure 1 Front panel 1 ...

Page 8: ...50 or 60 Hz 4 DISP key to display the subresults of the selected function Check current and potential probe resistances Rc and Rp in EARTH R EARTH and functions 5 MEM key to store and recall results 6 CLR key to erase memorized results and or reset the instrument 7 CURSOR down key to Decrease storage MEM code View the next result Earth resistivity function Decrease the distance a between test rods...

Page 9: ...ster to PC 4 Battery charger connector The test connector is intended for connection of the test cable and is accessible only when the instrument cover is lifted up RS 232 and battery charger connectors are accessible only when the cover of the instrument is closed For safety reasons both connector fields cannot be accessible at the same time the cover of the instrument selects the accessible one ...

Page 10: ...cription of possible display messages 1999 Result out of range and 20 V External voltage is higher than approx 20 Veff and on RC Current spike resistance is too high and on RP Potential spike resistance is too high and on Low IC Current tested by clamp is lower than 0 5 mA and on Current noise is higher than approx 2 1 A or and noise voltage is higher than approx 5 V MEM Operating with storage sto...

Page 11: ...nt methods The appropriate one is selected by the operator depending on the particular earthing system to be tested Selective Earth Resistances can be measured using test clamp without mechanical disconnection of tested earthing electrode Probeless measurement can be done using two test clamps 2 6 1 Standard four lead test method The four lead connection gives much better results than the three le...

Page 12: ...ection of standard 20 m long test leads Figure 6 Connection of optional 50 m long test leads REarthtot RE1 RE2 RE3 RE4 R E1 E4 separate earthing resistance R P potential spike resistance P Potenzial R C current spike resistance C Current R Earthtot total earth resistance of tested earthing system d probe distance d 20 m tolerance depending on potential gradient ...

Page 13: ...instructions on how to use memory in chapter 3 1 1 Storing of test results Notes When an external voltage higher than 20 Vac dc is present between H and E or ES and S test terminals the Earth Resistance measurement will not be carried out after pressing START key but the message 20 V will be displayed marked with symbol If a noise voltage higher than approx 5 V is present between the H and E or ES...

Page 14: ...ions are usually very difficult to disconnect because of corroded connection components screws nuts spacers etc The main advantage of the selective measurement method with clamp is that there is no need to mechanically disconnect the electrode under test Step 1 Connect test leads and sensitive test clamp E Clip 1 to the instrument and to the object under test in accordance with the figure below Fi...

Page 15: ...en the H and E or ES and S test terminals the Earth Resistance measurement will not be carried out after pressing START key but the message 20 V will be displayed marked with symbol If a noise voltage higher than approx 5 V is present between the H and E or ES and S test terminals a cursor mark pointing to the noise symbol will be displayed indicating that the test result may not be correct If the...

Page 16: ...drive test probes into the ground and measurements of complex earthing systems see figure 8 The advantage of this principle is that there is no need to drive measurement probes in or to separate the measured electrodes Equivalent electrical circuit diagram of Figure 10 is presented on the figure below Figure 10 Equivalent electrical circuit diagram If the total Earth Resistance of the parallel con...

Page 17: ... Connection of two test clamps Step 2 Set function switch to position the following menu will be displayed Figure 12 Earth Resistance initial menu Step 3 The measurement commences constant measurement results are continuously displayed Last result will stay displayed Store the displayed result for documentation purpose see instructions how to use memory in chapter 3 1 1 Storing of test results ...

Page 18: ...rrent However the accuracy in this instance is not guaranteed Procedure for adjusting non original clamp if used as generator clamp Using a clamp other than that a recommended could seriously impact on the measured results due to different coil inductivities It is possible to compensate for this effect when using 1 1000 current clamps from another supplier Compensation procedure for non original c...

Page 19: ...h Resistivity parameter namely m European countries ft The United States This is why the Earth Tester offers both units as well as allowing the use of both units for the selected distance a m ft between the test rods See the procedure on how to select appropriate unit in chapter 3 4 General settings Step 1 Connect test leads to the instrument and to test rods in accordance with the figure below Fi...

Page 20: ... adjustment menu Set appropriate Distance a Single press will increase decrease the value for one step while continuous pressure will increase decrease it continuously Return to Earth Resistivity initial menu Step 4 View the test result If you want to perform more than one measurement press the START key and keep it pressed until the result has stabilized then release the key The last result will ...

Page 21: ...ll not be carried out after pressing START key but the message 20 V will be displayed marked with symbol In case of a noise voltage higher than approx 5 V being present between the H and E or ES and S test terminals a cursor mark pointing to noise symbol will be displayed indicating that the test result may not be correct If the resistance of the current or potential probe is too high 4 k 100 RE o...

Page 22: ...ts can be caused by different faults in electrical installations or in earthing systems Do not attach any external voltage between C1 and C2 test terminals Step 1 Connect current current 1000 1 test clamp to Earth Tester see figure 15 or 16 Be aware that sensitive clamp E CLIP 1 supplied by METREL can cover the range 0 5 mA up to 20 A while standard range clamp can measure within 10 mA and 20 A Se...

Page 23: ...LIP 1 when searching for installation faults Step 3 Measurement commences constant measurement the result is continuously displayed Measurement stops last result will stay displayed Store the displayed result for documentation purpose see instructions in chapter 3 1 1 Storing of test results ...

Page 24: ...mory location can stack any measured result In storing result mode the operator selects a MEM code and then the result is stacked together with all its parameters into the selected memory location All results can be stored under a single MEM code e g No 001 if there is no need for grouping Organization of memory locations under a specific MEM code is explained on the figure below Figure 19 Organiz...

Page 25: ...esistance Potential Rp and current Rc Rs one clamp 2 Selective earth resistance Potential and current spike resistance Potential Rp and current Rc CURRENT TRMS 5 Current 3 1 1 Storing of test results All test results can be stored for later documentation purpose How to store displayed test result Once the test result is displayed the following procedure should be followed Last used MEM code is off...

Page 26: ... each measurement Figure 20 Function identification numbers Notes Each result can be stored only once Press The START key or change rotary switch position to cancel store procedure FUL message will be displayed when all memory locations are occupied 3 1 2 Recalling of stored results Stored results can be displayed whenever needed for visual check Main result potential subresult and potential funct...

Page 27: ...ill be displayed followed by the main result set by DISPLAY key before using the UP and DOWN keys Check subresult and function parameter When the last or first result is reached toP or bot message will appear followed by that result MEM or MEM Leave the recall function and return to the selected functions initial display If there are no stored results at all then no message will be displayed after...

Page 28: ...d CLR key until Clr MEM ALL MEM messages starts to alternate approx 3 s MEM MEM Confirm erasure all stored results will be erased Press the START key or change rotary switch position to cancel clear procedure How to erase the last stored result Press CLR key short until Clr MEM message appears MEM Confirm erasure The procedure may be repeated to erase other stored results Press the START key or ch...

Page 29: ... settings in Configuration COM Port menu Turn the instrument power ON Connect PC COM port to the instrument with the serial communication cable as shown on the figure below Figure 21 Connection of the Earth Tester to PC Run the Link exe program Push the Receive Results button third from left The PC and the instrument automatically recognize each other The program on the PC enables the following pr...

Page 30: ... to your PC All parameters will revert to their initial values Switch OFF the instrument Keep key pressed while switching ON the instrument A flashing rES message will be displayed After confirming reset rES message will be displayed for a short period meaning that the RESET function has been completed Parameter Function Initial value Frequency 50 Hz Distance a between test rods EARTH 10 m Table 2...

Page 31: ...f inserted batteries One set of full capacity batteries can supply the instrument for approx 50 hours Rechargeable NiCd or NiMH battery can be used instead of alkaline The instrument contains an additional connector for charging the batteries Caution Transfer stored results to PC before removing the batteries The results will be lost when the batteries are removed and all settable parameters will ...

Page 32: ...ring task and the stress to which your measuring instrument is subjected affect the ageing of the components and may result in deviations from the guaranteed accuracy If high measuring accuracy is required and the instrument is frequently used in field applications combined with transport stress and great temperature fluctuations we recommend a relatively short calibration interval of 1 year If yo...

Page 33: ...trical and Electronic Device Law This device is not subject to the RoHS directive We identify our electrical and electronic devices as of August 2005 in accordance with WEEE 2002 96 EG and ElektroG with the symbol shown to the right per DIN EN 50419 These devices may not be disposed of with the trash Please contact our service department regarding the return of old devices If you use batteries or ...

Page 34: ...est current 20 mA Automatic test of curr and pot test probe resistance yes Automatic test of voltage noise yes Earth Resistance using one clamp in combination with four lead method All technical data listed under four lead method are valid except display and meas ranges see adapted ones below Measurement range RE 0 11 1 99 k Display range Resolution Accuracy 0 00 19 99 0 01 2 rdg 3 D 20 0 199 9 0 ...

Page 35: ... Resistance resistivity All technical data listed under four lead method are valid except display range table see adapted one below Display range m Resolution m Accuracy 0 00 19 99 0 01 Consider accuracy of RE measurement 2 aRE 20 0 199 9 0 1 200 1999 1 2 00 k 19 99 k 10 20 0 k 199 9 k 0 1k 5 rdg 200 k 999 k a 8 m 200 k 1999 k a 8 m 1k Display range ft Resolution ft Accuracy 0 00 19 99 0 01 Consid...

Page 36: ...C LR14 or Rechargable batt 4 8 Vdc 4 1 2 V NiCd NiMH rechargeable battery per IEC LR14 Charging voltage 6 V Charging current 350 mA Battery charging 15 hours for full charge Battery capacity 3500 mAh Auto power off yes approximately 10 min of no activity Mechanical Data Dimensions w h d 15 5 9 5 19 cm Weight without accessories with batteries 1 3kg Display custom LCD Memories 1000 measurements Com...

Page 37: ...r 52 mm Transformation ratio 1000 A 1A Frequency range 40 Hz to 5 kHz Output signal 1 μA to 1 2 A Supplied with connector cable 1 5 m and laboratory safety plug E Clip 2 Clip On Generator Measuring range 0 2 A to 1200 A Measuring category 600 V CAT III Max cable diameter 52 mm Transformation ratio 1000 A 1A Frequency range 40 Hz to 5 kHz Output signal 0 2 mA to 1 2 A Equipped with laboratory safet...

Page 38: ... Germany Phone 49 911 817718 0 Fax 49 911 817718 253 e mail service gossenmetrawatt com www gmci service com This address is only valid in Germany Please contact our representatives or subsidiaries for service in other countries 8 Product Support If required please contact Gossen Metrawatt GmbH Product Support Hotline Phone 49 911 8602 931 Fax 49 911 8602 709 e mail support gossenmetrawatt com ...

Page 39: ...GEOHM 5 39 ...

Page 40: ...GEOHM 5 40 Phone 49 911 8602 111 Gossen Metrawatt GmbH Fax 49 911 8602 777 Südwestpark 15 e mail info gossenmetrawatt com 90449 Nürnberg Germany www gossenmetrawatt com ...

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