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AEMC instruments 6422, User Manual

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AEMC instruments 6422 User Manual Download Page 15

Ground Resistance Testers Models 6422 & 6424 

15 

1.8 INSTRUMENT FUNCTIONS

The Models 6422 and 6424 are battery-powered portable measuring instruments 

with LCD displays.
These instruments check the safety of electrical installations. They can be used 

to test a new installation before it is powered up. They can also check an existing 

installation (after it has been disconnected) or diagnose a malfunction in an 

installation.

Function

6422

6424

Ground resistance measurement (with three rods)

✔

 

✔

Voltage measurement

✔

Resistance measurement

✔

 

✔

Average of ground measurements at 52, 62, and 72 %

✔

RH over limit detection

✔

 

✔

RE over limit detection

✔

 

✔

Stray or foreign voltage on USE detection

✔

 

✔

AC current measurement with current clamp (optional)

✔

 

1.9 BUTTONS AND KEYS

Both Models:

Buttons

Function

Long press (> 2 seconds) turns instrument ON.

Second long p ress turns instrument OFF.

TEST

Short press starts ground measurements in 

automatic mode (§ 2.3.3).
Long press starts ground measurements in 

permanent mode. Pressing 

TEST

 during a 

measurement stops the measurement (§ 2.3.5).
At the end of the measurement, pressing 

TEST

 

exits the frozen measurement display.

. 

+ TEST

Pressing 

 and 

TEST

 simultaneously for 

> 5 seconds while turning ON the instrument 

changes the names of the H, S, E terminals to C, 

P, X (§ 2.3.2).

Summary of Contents for 6422

Page 1: ...Ground Tester Models 6422 6424 User Manual ENGLISH GROUND RESISTANCE TESTERS WITH AEMC INSTRUMENTS ...

Page 2: ...742 2346 This documentation is provided as is without warranty of any kind express implied or otherwise Chauvin Arnoux Inc has made every reasonable effort to ensure that this documentation is accurate but does not warrant the accuracy or completeness of the text graphics or other information contained in this documentation Chauvin Arnoux Inc shall not be liable for any damages special indirect in...

Page 3: ... at the time of purchase or obtained by returning the instrument to our repair and calibration facility for a nominal charge The recommended calibration interval for this instrument is 12 months and begins on the date of receipt by the customer For recalibration please use our calibration services Refer to our repair and calibration section at www aemc com Serial Catalog Model 6422 6424 Please fil...

Page 4: ...EASUREMENT 2P 19 2 2 1 Model 6422 19 2 2 2 Model 6424 20 2 3 GROUNDING RESISTANCE 3P 22 2 3 1 3 Point Test Theory of Operation 22 2 3 1 1 Position of the Auxiliary Electrodes in Measurements 23 2 3 1 2 Measuring Resistance of Ground Electrodes 62 Method 24 2 3 1 3 Auxiliary Electrode Spacing 25 2 3 1 4 Multiple Electrode System 26 2 3 2 Terminals Definitions 27 2 3 3 Grounding Resistance Measureme...

Page 5: ...e Measurement Model 6424 36 3 3 2 Resistance Measurement 2P 37 3 3 3 Resistance Measurement 3P 37 3 3 4 Current Measurement Model 6424 38 3 4 UNCERTAINTY 38 3 5 ENVIRONMENTAL CONDITIONS 39 3 6 POWER SUPPLY 39 3 7 MECHANICAL SPECIFICATIONS 40 3 8 INTERNATIONAL STANDARDS 40 3 9 ELECTROMAGNETIC COMPATIBILITY CEM 40 4 MAINTENANCE 41 4 1 CLEANING 41 4 2 BATTERY REPLACEMENT 41 4 3 REPAIR AND CALIBRATION...

Page 6: ... Clamp The product has been declared recyclable Battery This product complies with the Low Voltage Electromagnetic Compatibility European directives 73 23 CEE 89 336 CEE In the European Union this product is subject to a separate collection system for recycling electrical and electronic components in accordance with directive WEEE 2002 96 EC Definition of Measurement Categories CAT CAT IV correspo...

Page 7: ...eck the condition of the insulation on the leads housing and accessories Any item of which the insulation is deteriorated even partially must be set aside for repair or scrapping Before using your instrument check that it is perfectly dry If it is wet it must be thoroughly dried before it can be connected or used The use of leads or accessories of a lower voltage or category limits the voltage or ...

Page 8: ...ble carrying bag and user manual Ground Tester Model 6424 Kit 150 ft Cat 2135 58 Includes ground tester 2 150 ft color coded leads on spools red blue 1 30 ft lead green 2 T shaped auxiliary ground electrodes set of 2 5 ft color coded red blue leads 1 100 ft AEMC Instruments tape measure 6 AA rechargeable NiMH batteries USB to wall charger 5 V 2 A USB charger cable carrying bag and user manual Grou...

Page 9: ...ludes 2 150 ft color coded leads on spools red blue 1 30 ft lead green 2 14 5 in T shaped auxiliary ground electrodes set of 2 5 ft color coded red blue leads 1 100 ft AEMC Instruments tape measure and carrying bag Test Kit for 3 Point Testing Cat 2135 36 Includes 2 300 ft color coded leads on spools red blue 2 100 ft color coded leads hand tied green black set of 2 5 ft color coded red blue leads...

Page 10: ...s 6422 6424 1 4 BATTERY INSTALLATION 1 Open the battery compartment cover 2 With your fingers on either side of the cover insert a tool for example a screwdriver in the latching system and lift up 3 Remove the battery compartment cover ...

Page 11: ...kaline batteries installed and the Model 6424 with rechargeable batteries installed 3 Press the rubber seal back in place ensuring it correctly covers the compartment 4 Replace the battery compartment cover NOTE If you insert disposable batteries in the Model 6424 the batteries will last longer but the battery level indicator will be inaccurate If you insert rechargeable batteries in the Model 642...

Page 12: ... USB cable to the Model 6424 terminal block and the other end to a wall outlet using the provided external power to USB adapter 2 The instrument displays CHrG While the battery charges the battery level indicator displays progress Full charging requires approximately 6 hours 3 When the battery level indicator shows full charge disconnect the USB cable from the instrument 1 6 DESKTOP STAND The inst...

Page 13: ...Ground Resistance Testers Models 6422 6424 13 1 7 INSTRUMENT INTERFACE 1 7 1 Model 6422 ...

Page 14: ...14 Ground Resistance Testers Models 6422 6424 1 7 2 Model 6424 ...

Page 15: ...Average of ground measurements at 52 62 and 72 RH over limit detection RE over limit detection Stray or foreign voltage on USE detection AC current measurement with current clamp optional 1 9 BUTTONS AND KEYS Both Models Buttons Function Long press 2 seconds turns instrument ON Second long p ress turns instrument OFF TEST Short press starts ground measurements in automatic mode 2 3 3 Long press st...

Page 16: ...t 52 of the distance 2 3 4 Pressing and then activates deactivates lead compensation Pressing and then for 2 seconds compensates the resistance of the leads for the resistance measurement 2 2 2 62 stores the displayed measurement with the S rod at 62 of the distance 2 3 Pressing and then turns on backlighting for one minute or turns backlighting off 72 stores the displayed measurement with the S r...

Page 17: ...ound measurement HOLD indicates measurement is frozen AVG indicates the displayed measurement is the average of 3 measurements indicates the range of variation in the averaged measurements 4 Main display 5 Errors in the displayed measurement and Model 6424 in the ground measurement stored in memory 6 Model 6424 additional information about the ground measurement ...

Page 18: ...ON the instrument by pressing for 2 seconds 2 Press to access the voltage measurement mode The symbol V appears on the right side of the LCD 3 Connect one end of the leads to the V and COM terminals and the other end to the sample under test The measurement appears on the LCD NOTE If the measurement falls outside the instrument s measurement range the LCD displays 700 V ...

Page 19: ... 6422 NOTE The sample under test should not be live 1 Turn ON the instrument by pressing for 2 seconds The symbol 2P appears on the right side of the LCD 2 Connect one end of the leads to the Ω and COM terminals and the other end to the sample under test The measurement appears on the LCD ...

Page 20: ...ents perform lead compensation This subtracts the test lead resistance from the measurement Connect one end of the leads to the Ω and COM terminals and touch the other ends together creating a short circuit 4 Press the button 5 Press for 2 seconds The symbol blinks during the compensation procedure When finished the LCD displays 00 00Ω NOTE If the message Err appears the compensation procedure fai...

Page 21: ...s that were compensated In this case repeat the compensation Lead compensation is preserved after Auto Off but not after the instrument is manually turned OFF NOTE Error messages 99 99 kΩ The measured value falls outside the instrument s measurement range NOISE A stray or foreign voltage UHE 3 V is detected between the Ω and COM terminals A stray or foreign voltage UHE 50 V is detected between the...

Page 22: ...inals USE 3 Calculates the value of RE USE IHE The 3P test can also be performed on an existing electrical installation but the power must be OFF Whether testing a new or existing installation the grounding electrode system under test must be isolated from other grounding connections during the measurement 2 3 1 3 Point Test Theory of Operation 3 Point measurement is used to measure resistance to ...

Page 23: ...ance areas is to move it between E and H and to take a reading at each location If the auxiliary potential rod S is in an effective resistance area or in both if they overlap by displacing it the readings taken will vary noticeably in value Under these conditions no exact value for the resistance to ground may be determined On the other hand if the auxiliary potential rod S is located outside the ...

Page 24: ... that the ground tested is a single unit This method applies only when all three electrodes are in a straight line and the ground is a single electrode pipe or plate etc as shown below Consider the illustration below which shows the effective resistance areas concentric shells of the ground electrode E and of the auxiliary current electrode H The resistance areas overlap ...

Page 25: ... is placed at 62 of the distance from E to H and that the readings on either side of the initial Y setting are most likely to be within the established tolerance band This tolerance band is defined by the user and expressed as a percent of the initial reading 2 5 10 etc 2 3 1 3 Auxiliary Electrode Spacing No definite distance between X and Z can be given since this distance is relative to the diam...

Page 26: ...e System A single driven ground electrode is an economical and simple means of making a good ground system but sometimes a single rod will not provide sufficient low resistance and several ground electrodes will be driven and connected in parallel by a cable Very often when two three or four ground electrodes are used they are driven in a straight line When four or more are used a hollow square co...

Page 27: ... 78 ft 125 ft 8 ft 87 ft 140 ft 10 ft 100 ft 160 ft 12 ft 105 ft 170 ft 14 ft 118 ft 190 ft 16 ft 124 ft 200 ft 18 ft 130 ft 210 ft 20 ft 136 ft 220 ft 30 ft 161 ft 260 ft 40 ft 186 ft 300 ft 50 ft 211 ft 340 ft 60 ft 230 ft 370 ft 80 ft 273 ft 440 ft 100 ft 310 ft 500 ft 120 ft 341 ft 550 ft 140 ft 372 ft 600 ft 160 ft 390 ft 630 ft 180 ft 434 ft 700 ft 200 ft 453 ft 730 ft 2 3 2 Terminals Defini...

Page 28: ...ding electrode To avoid electromagnetic interference we recommend using the full length of the cables placing them several inches apart and avoiding loops 2 Connect the cables to the H and S terminals 3 Power down the installation and isolate the ground under test from other ground systems and connections 4 Connect the E terminal to the grounding electrode to be tested 5 Press TEST to take a measu...

Page 29: ...easurement 2 Press to store the measurement 3 Place the S rod at 52 of d and take another measurement 4 Press to store the measurement The instrument immediately calculates and displays the average of the three measurements and the percent difference between the lowest and highest values For the measurement to be valid the difference must not exceed 5 If it is place the H electrode out further and...

Page 30: ...played Model 6424 RH and USE values are displayed 3 Press TEST to stop measurement 2 3 6 Validating the Measurement 1 Place the S rod at 72 of d and take a measurement 2 Move the S rod to 52 of d and take a measurement All three measurements must be within 5 of each other for the measurement to be valid If not the S rod is within the zone of influence of the grounding electrode If this is the case...

Page 31: ...d If in line rod configuration is not possible you can place the rods in an equilateral triangle To validate the measurement move the S rod on either side of the line HE 2 3 6 2 Ground Measurement Tips To avoid cross talk with the measurement current do not route the connecting cables of the rods near or parallel to other cables transmission or power supply metal pipes rails or fences To reduce au...

Page 32: ...ISE USE or UHE voltage amplitude is between 3 and 50 V blinking USE or UHE 50 V no measurement is possible 2 4 AC CURRENT MEASUREMENT MODEL 6424 AC current measurement requires an optional MN72 current probe 1 Turn ON the instrument by pressing for 2 seconds 2 Press 3 Connect the clamp to the instrument s current terminal identified by the symbol The A and symbols appear o n the LCD 4 Open the cla...

Page 33: ...esters Models 6422 6424 33 The measurement appears on the LCD NOTE Error messages 70 00 A The measured value falls outside the instrument s measurement range Err The probe is not completely inserted the symbol also blinks ...

Page 34: ...intrinsic uncertainty plus the effects of variation of the quantities of influence supply voltage temperature interference etc as defined in standard IEC 61557 5 The uncertainties are expressed in of the reading R and in number of display cts a R b ct NOTE The Model 6424 cannot make measurements when the battery charger is connected 3 2 ELECTRICAL SPECIFICATIONS 3 2 1 Voltage Measurement Model 642...

Page 35: ...al reference conditions Resistance of the E lead 0 1 Ω RH rod lead 100 Ω RS rod lead 1 kΩ Spurious voltages on UHE and USE 0 01 V Model 6422 Ground Measurement Measurement range 0 50 99 99 Ω 80 0 999 9 Ω 0 800 2000 kΩ Resolution 0 01 Ω 0 1 Ω 1 Ω Intrinsic uncertainty 1 R 10 ct 1 R 2 ct 1 R 1 ct Measurement frequency 128 Hz or 256 Hz No load voltage 10 VPEAK Model 6424 Ground Measurement Measuremen...

Page 36: ... two of the three input terminals 3 2 4 Current Measurement Model 6424 Additional reference condition Peak factor 2 Measurement range 0 5 999 9 mA 0 800 9 999 A 8 00 60 00 A Resolution 0 1 mA 1 mA 10 mA Intrinsic uncertainty 1 R 4 ct 1 R 2 ct 1 R 2 ct 3 3 INFLUENCES 3 3 1 Voltage Measurement Model 6424 Quantities of influence Limits of the range of use Variation of the measurement Typical Maximum ...

Page 37: ...25 V 0 5 R 0 5 Ω 2 R 5 Ω 2 R 1 Ω 4 R 10 Ω 3 3 3 Resistance Measurement 3P Quantities of influence Limits of the range of use Variation of the measurement Typical Maximum Temperature 14 to 122 F 10 to 50 C 1 R 2 R Relative humidity 10 to 90 RH 2 R Supply voltage Model 6422 6 0 to 9 6 V Model 6424 6 0 to 7 6 V 2 R 1 Ω Voltage in series between S and E 50 60 Hz 0 to 3 V 0 5 R 0 2 Ω 1 R 1 Ω 3 to 25 V ...

Page 38: ...ting uncertainty B be less than 30 In ground measurement with A intrinsic uncertainty E1 influence of the reference position 90 E2 influence of the supply voltage within the limits indicated by the manufacturer E3 influence of the temperature between 32 and 95 F 0 and 35 C E4 influence of the interference voltage in series mode 3 V at 16 6 50 60 and 400 Hz E5 influence of the resistance of the rod...

Page 39: ...n degree 2 3 6 POWER SUPPLY Model 6422 6 LR6 or AA disposable batteries Model 6424 6 NiMH type AA rechargeable batteries The charging time is approximately 6 h NOTE During charging the instrument cannot make measurements All front panel buttons are disabled Function Model 6422 disposable batteries Model 6424 rechargeable batteries Voltage Current 80 h 50 h Resistance 2500 measurements from 5 s to ...

Page 40: ...529 IK 04 per IEC 50102 Free fall test 1 meter per IEC 61010 1 3 8 INTERNATIONAL STANDARDS The instrument Conforms with IEC 61010 2 030 600 V CAT IV pollution degree 2 Assigned characteristics measurement CAT IV 600 V with respect to earth Complies with IEC 61557 parts 1 and 5 Is protected by reinforced insulation 3 9 ELECTROMAGNETIC COMPATIBILITY CEM The instrument conforms with standard IEC 6132...

Page 41: ...ernal procedures For instrument repair and calibration You must contact our Service Center for a Customer Service Authorization Number CSA Send an email to repair aemc com requesting a CSA you will be provided a CSA Form and other required paperwork along with the next steps to complete the request Then return the instrument along with the signed CSA Form This will ensure that when your instrument...

Page 42: ...efects in manufacture This limited warranty is given by AEMC Instruments not by the distributor from whom it was purchased This warranty is void if the unit has been tampered with abused or if the defect is related to service not performed by AEMC Instruments Full warranty coverage and product registration is available on our website at www aemc com warranty html Please print the online Warranty C...

Page 43: ... steps to complete the request Then return the instrument along with the signed CSA Form Please write the CSA on the outside of the shipping container Return the instrument postage or shipment pre paid to Chauvin Arnoux Inc d b a AEMC Instruments 15 Faraday Drive Dover NH 03820 USA Phone 800 945 2362 Ext 360 603 749 6434 Ext 360 Fax 603 742 2346 E mail repair aemc com Caution To protect yourself a...

Page 44: ...AEMC Instruments 15 Faraday Drive Dover NH 03820 USA Phone 603 749 6434 800 343 1391 Fax 603 742 2346 www aemc com 03 23 99 MAN 100517 v04 Chauvin Arnoux Inc d b a AEMC Instruments All Rights Reserved ...

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