AEMC 6422 User Manual
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AEMC 6422 User Manual

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6422
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GROUND TESTER
6424
ENGLISH
User Manual

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Summary of Contents for AEMC 6422

  • Page 1 6422 ■ GROUND TESTER 6424 ENGLISH User Manual...
  • Page 2 Serial #: Catalog #: 6422 / 6424 Model #: Please fill in the appropriate date as indicated: Date Received: Date Calibration Due: ® Chauvin Arnoux , Inc. ® d.b.a AEMC Instruments www.aemc.com Ground Tester Models 6422/6424...

  • Page 3: Table Of Contents

    3.8. International Standards ..............38 3.9. Electromagnetic Compatibility (CEM) .......... 38 4. MAINTENANCE ................. 39 4.1. Cleaning ..................39 4.2. Replacing the batteries ..............39 REPAIR AND CALIBRATION .............. 40 TECHNICAL AND SALES ASSISTANCE ..........40 LIMITED WARRANTY ................ 41 Ground Tester Models 6422/6424...
  • Page 4 Thank you for purchasing the AEMC Ground Tester Model 6422 or 6424. For best results from your instrument and for your safety, read the enclosed operating instructions carefully and comply with the precautions for use. These products must be only used by qualified and trained users.
  • Page 5 Example: distribution panel, circuit-breakers, machines or fixed industrial devices. CAT II Measurement category II corresponds to measurements taken on circuits directly connected to low-voltage installations. Example: power supply to domestic electrical appliances and portable tools. Ground Tester Models 6422/6424...
  • Page 6 Ground Tester Model 6422…………………..…….……....Cat. #2135.55 Includes 6 AA alkaline batteries, carrying bag and user manual Ground Tester Model 6422 Kit-150 ft …………………..…..Cat. #2135.56 Includes ground tester, two 150 ft color-coded leads on spools (red/blue), one 30 ft lead (green), two T-shaped auxiliary ground electrodes, set of two ®...
  • Page 7 Bag – Multi-purpose large canvas bag (replacement for ground kits) …………..………..…….…..Cat. #2119.82 Case – Replacement carrying case for Models 3620, 3640, 4600, 4610, AN1, 6422, 6424, 6501 & 6503…………….……... Cat. #2126.71 ® Tape measure – AEMC 100 ft ………………………….……..… Cat. #2130.60 Test Kit for 3-Point Testing ………………………………….…..…...

  • Page 8: Introduction

    1.1 Battery Installation Open the battery compartment cover. With your fingers on either side of the cover, insert a tool (for example a screwdriver) in the latching system, and lift up. Remove the battery compartment cover. Ground Tester Models 6422/6424...
  • Page 9 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 6422, the battery level indicator will always display low battery level and the batteries will not last as long.

  • Page 10: Battery Charging (Model 6424)

    The instrument displays CHrG. While the battery charges, the battery level indicator displays progress. Full charging requires approximately 6 hours. When the battery level indicator shows full charge disconnect the USB cable from the instrument. Ground Tester Models 6422/6424...

  • Page 11: Desktop Stand

    Pull the supports out to lock them in place, then place the instrument on a flat surface. 1.4 Instrument Interface 1.4.1 Model 6422 Terminal block: 3 measurement terminals Hazardous voltage indicator TEST button ON/OFF button Backlit LCD display Ground Tester Models 6422/6424...
  • Page 12 1.4.2 Model 6424 Terminal block Battery charger Connector for optional input MN72 AC Current Probe Measurement terminals Hazardous voltage indicator Backlit LCD display ON/OFF button TEST button Function keys Measurement data storage location Ground Tester Models 6422/6424...

  • Page 13: Instrument Functions

    1.5 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.
  • Page 14 S rod at 72% of the distance (§2.3.4). Pressing and then deactivates the Auto Off feature. activates the “second” functions of the 52%, 62%, and 72% keys (§2.3). Pressing for >2 seconds erases the values stored in memory. Ground Tester Models 6422/6424...

  • Page 15: Lcd Display

    % indicates the range of variation in the averaged measurements Main display Errors in the displayed measurement and (Model 6424) in the ground measurement stored in memory (Model 6424) additional information about the ground measurement Ground Tester Models 6422/6424...

  • Page 16: Operation

    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. If the measurement falls outside the instrument’s measurement range, the LCD displays >700.0V. Ground Tester Models 6422/6424...

  • Page 17: Resistance Measurement (2P)

    P appears on the right side of the LCD. symbol 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. Ground Tester Models 6422/6424...
  • Page 18 When finished, the LCD displays 00.00Ω. If the message Err appears, the compensation procedure failed, either because the value to be compensated exceeds 5Ω or because the leads were disconnected during compensation. Press to deactivate/reactivate lead compensation. Ground Tester Models 6422/6424...
  • Page 19 A stray or foreign voltage U > 50V is detected between the Ω and COM terminals; in this case measurement is not possible. Note that 2P mode is useful for ensuring the H electrode connection is intact. Ground Tester Models 6422/6424...
  • Page 20 = 20 ohms It is not necessary to calculate all the measurements when using a ground tester. The ground tester will measure directly by generating its own current and displaying the resistance of the ground electrode. Ground Tester Models 6422/6424...
  • Page 21 The readings taken should be relatively close to each other, and are the best values for the resistance to ground of the ground E. The readings should be plotted to ensure that they lie in a “plateau” region as shown below. Ground Tester Models 6422/6424...
  • Page 22 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. Ground Tester Models 6422/6424...
  • Page 23 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. Ground Tester Models 6422/6424...
  • Page 24 1" in diameter. (For a diameter of 1/2", reduce the distance by 10%; for a diameter of 2" increase the distance by 10%.) Ground Tester Models 6422/6424...
  • Page 25 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 configuration is used and the ground electrodes are still connected in parallel and equally spaced (see below). Ground Tester Models 6422/6424...
  • Page 26 While turning ON the instrument, simultaneously press and hold down the and TEST buttons for >5 seconds. The terminal assignments will be changed to C, P, and X. These assignments will be retained even when the instrument is turned OFF. Ground Tester Models 6422/6424...

  • Page 27: Grounding Resistance Measurement (3P)

    5. Press TEST to take a measurement in automatic mode. The TEST button blinks red, then the measurement is displayed. It remains frozen (HOLD) until you press TEST again. (Model 6424) R and U values are displayed. Ground Tester Models 6422/6424...
  • Page 28 For the measurement to be valid, the difference must not exceed 5%. If it is, place the H electrode out further and repeat the tests at the 52%, 62%, and 72% distances. Press for >2 seconds to erase the stored measurements. Ground Tester Models 6422/6424...
  • Page 29 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, place the H electrode further away and repeat the measurement. Ground Tester Models 6422/6424...
  • Page 30 Another way to reduce rod resistance is to drive the rods deeper and  firmly pack the earth around them, or sprinkle water on them. After completing the measurement, reconnect the grounding strip before restoring power to the installation. Ground Tester Models 6422/6424...

  • Page 31: Ac Current Measurement (Model 6424)

    2.3.7 Error Messages >3.000kΩ (Model 6422) Measurement outside range >60.00kΩ (Model 6424) Measurement outside range S (blinking) S rod resistance >50kΩ P (blinking) RH ! (blinking) H rod resistance >15kΩ NOISE or U voltage amplitude is between 3 and 50V or U >...
  • Page 32 The measurement appears on the LCD. Error messages: >70.00A: The measured value falls outside the instrument’s measurement range. Err: The probe is not completely inserted (the symbol also blinks). Ground Tester Models 6422/6424...

  • Page 33: Specifications

    Quantity of influence Reference values Temperature 73 ± 3.6 °F (23 ± 2 °C) Relative humidity 45 to 75% RH Model 6422: 8 ± 0.2 V Supply voltage Model 6424: 6 ± 0.2 V Frequency 45 to 65Hz Electric field <...
  • Page 34 Resistance of the E lead: ≤ 0.1Ω (rod + lead) ≤ 100Ω (rod + lead) ≤ 1kΩ Spurious voltages on U and U ≤ 0.01V Model 6422 Ground Measurement Measurement 0.50 - 99.99Ω 80.0 - 999.9Ω 0.800 – 2.000kΩ range Resolution 0.01Ω...

  • Page 35: Influences

    Relative humidity 10 to 90% RH ± 2% R Frequency DC to 440Hz -3dB Peak factor 1.4 to 3 (up to 300V) ± 1% R DC and 50/60Hz 0 to 600V 65dB 50dB common mode rejection Ground Tester Models 6422/6424...
  • Page 36 10mΩ/°C) 2 mΩ/°C) Relative humidity 10 to 90% RH ± 1% R ± 2% R Model 6422: 6.0 to 9.6V Supply voltage ± (2% R + 1Ω) Model 6424: 6.0 to 7.6V 50/60Hz voltage 0 to 3V ± (0.5% R + 0.5Ω) ±...

  • Page 37: Uncertainty

    = influence of the network frequency from 99 to 101% of the nominal frequency = influence of the network voltage from 85 to 110% of the nominal voltage The uncertainty of operation of the instrument is ≤ 15% + 1Ω Ground Tester Models 6422/6424...

  • Page 38: Environmental Conditions

    Altitude < 6500’ (2,000m) Pollution 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 hours. During charging, the instrument cannot make measurements. All front panel buttons are disabled.

  • Page 39: Mechanical Specifications

    Assigned characteristics: measurement CAT IV, 600 V with respect to earth. Complies with IEC 61557 parts 1 and  Is protected by reinforced insulation.  3.9 Electromagnetic Compatibility (CEM) The instrument conforms with standard IEC 61326-1. Ground Tester Models 6422/6424...

  • Page 40: Maintenance

    2. Open the battery compartment as instructed in §1.1. 3. Remove the old batteries. 4. Insert new batteries as instructed in §1.1. Spent batteries must not be treated as ordinary household waste. Take them to the appropriate recycling collection facility. Ground Tester Models 6422/6424...

  • Page 41: Repair And Calibration

    ® ® Chauvin Arnoux , Inc. d.b.a. AEMC Instruments Phone: (800) 343-1391 (508) 698-2115 Fax: (508) 698-2118 E-mail: techsupport@aemc.com www.aemc.com NOTE: Do not ship instruments to our Foxborough, MA address. Ground Tester Models 6422/6424...

  • Page 42: Limited Warranty

    This warranty is void if the instrument has been tampered with or ® abused, or if the defect is related to service not performed by AEMC Instruments. The warranty does not apply in the following cases: Inappropriate use of the equipment or use with incompatible equipment.
  • Page 43 Ground Tester Models 6422/6424...
  • Page 44 03/20 99-MAN 100517 v1 Chauvin Arnoux ® , Inc. d.b.a. AEMC ® Instruments 15 Faraday Drive • Dover, NH 03820 USA Phone: (603) 749-6434 • Fax: (603) 742-2346 www.aemc.com...

This manual is also suitable for:

6424

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