Related Manuals for AEMC instruments 6422
Summary of Contents for AEMC instruments 6422
- Page 1 User Manual ENGLISH Ground Tester Models 6422 & 6424 GROUND RESISTANCE TESTERS WITH AEMC INSTRUMENTS ®...
- Page 2 Copyright Chauvin Arnoux , Inc. d.b.a. AEMC Instruments. All rights reserved. © ® ® No part of this documentation may be reproduced in any form or by any means (including electronic storage and retrieval or translation into any other language) without prior agreement and written consent from Chauvin Arnoux , Inc., as governed by United States and International copyright laws.
- Page 3 For recalibration, please use our calibration services. Refer to our repair and calibration section at www.aemc.com. Serial #: Catalog #: Model #: 6422 / 6424 Please fill in the appropriate date as indicated: Date Received: Date Calibration Due: Chauvin Arnoux , Inc.
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Page 4: Table Of Contents
1.4 BATTERY INSTALLATION ............10 1.5 BATTERY CHARGING MODEL (6424) ........12 1.6 DESKTOP STAND ..............12 1.7 INSTRUMENT INTERFACE ............ 13 1.7.1 Model 6422 ................ 13 1.7.2 Model 6424 ............... 14 1.8 INSTRUMENT FUNCTIONS ........... 15 1.9 BUTTONS AND KEYS ............. 15 1.10 LCD DISPLAY ................. - Page 5 3. SPECIFICATIONS .............34 3.1 GENERAL REFERENCE CONDITIONS........ 34 3.2 ELECTRICAL SPECIFICATIONS ........... 34 3.2.1 Voltage Measurement (Model 6424) (V/A) ....... 34 3.2.2 Resistance Measurement (2P) ......... 35 3.2.3 Ground Resistance Measurement (3P) ......35 3.2.4 Current Measurement (Model 6424) ........ 36 3.3 INFLUENCES ................
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Page 6: Introduction
Example: hardwired equipment in fixed installation and circuit breakers. CAT II corresponds to measurements performed on circuits directly connected to the electrical distribution system. Example: measurements on household appliances and portable tools. Ground Resistance Testers Models 6422 & 6424... -
Page 7: Precautions For Use
Save the damaged packing container to substantiate your claim. Ground Resistance Testers Models 6422 & 6424... -
Page 8: Ordering Information
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, (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... -
Page 9: Accessories And Replacement Parts
Bag – Multi-purpose large canvas bag (replacement for ground kits) …………..……..……..…….…....Cat. #2119.82 Case – Carrying case for Models 3620, 3640, 4600, 4610, AN1, 6422, 6424, 6501 & 6503…………….….……..Cat. #2126.71 Tape measure – AEMC Instruments 100 ft …..……..….……..… ... Cat. #2130.60 ®... -
Page 10: 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 Resistance Testers Models 6422 & 6424... - Page 11 Insert the batteries, ensuring correct polarities. We recommend disposable batteries for the Model 6422 (for example alkaline) and rechargeable batteries for the Model 6424. The Model 6422 comes with alkaline batteries installed, and the Model 6424 with rechargeable batteries installed.
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Page 12: Battery Charging Model (6424)
The instrument is equipped with two back supports that enable desktop operation from an angled position. Pull the supports out to lock them in place, then place the instrument on a flat surface. Ground Resistance Testers Models 6422 & 6424... -
Page 13: Instrument Interface
1.7 INSTRUMENT INTERFACE 1.7.1 Model 6422 Ground Resistance Testers Models 6422 & 6424... -
Page 14: Model 6424
1.7.2 Model 6424 Ground Resistance Testers Models 6422 & 6424... -
Page 15: Instrument Functions
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. - Page 16 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 Resistance Testers Models 6422 & 6424...
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Page 17: 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 Resistance Testers Models 6422 & 6424... -
Page 18: Operation
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. Ground Resistance Testers Models 6422 & 6424... -
Page 19: Resistance Measurement (2P)
2P appears on the right side of the LCD. Ω and COM terminals and 2. Connect one end of the leads to the the other end to the sample under test. The measurement appears on the LCD. Ground Resistance Testers Models 6422 & 6424... -
Page 20: Model 6424
NOTE: If the message Err appears, the compensation procedure failed, either because the value to be compensated exceeds 5 Ω or because the leads were disconnected during compensation. Press to deactivate/reactivate lead compensation. Ground Resistance Testers Models 6422 & 6424... - Page 21 : A stray or foreign voltage U > 50 V is detected between the 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 Resistance Testers Models 6422 & 6424...
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Page 22: Grounding Resistance (3P)
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 Resistance Testers Models 6422 & 6424... -
Page 23: Position Of The Auxiliary Electrodes In Measurements
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 Resistance Testers Models 6422 & 6424... -
Page 24: Measuring Resistance Of Ground Electrodes (62 % Method)
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 Resistance Testers Models 6422 & 6424... -
Page 25: Auxiliary Electrode Spacing
1 in in diameter. (For a diameter of 1/2 in, reduce the distance by 10 %; for a diameter of 2 in increase the distance by 10 %.) Ground Resistance Testers Models 6422 & 6424... -
Page 26: Multiple Electrode System
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 Resistance Testers Models 6422 & 6424... -
Page 27: Terminals Definitions
TEST buttons for >5 seconds. and hold down the The terminal assignments will be changed to C, P, and X. These assignments will be retained even when the instrument is turned OFF. Ground Resistance Testers Models 6422 & 6424... -
Page 28: Grounding Resistance Measurement
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 Resistance Testers Models 6422 & 6424... -
Page 29: Measurement Average (Model 6424)
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 Resistance Testers Models 6422 & 6424... -
Page 30: Measurement Mode (Model 6424)
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 Resistance Testers Models 6422 & 6424... -
Page 31: Auxiliary Rod Positioning
Another way to reduce rod resistance is to drive the rods deeper and firmly pack the earth around them, or sprinkle water on them. NOTE: After completing the measurement, reconnect the grounding strip before restoring power to the installation. Ground Resistance Testers Models 6422 & 6424... -
Page 32: Error Messages
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 clamp and place it on the conductor under test. Ground Resistance Testers Models 6422 & 6424... - Page 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). Ground Resistance Testers Models 6422 & 6424...
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Page 34: Specifications
Voltage Measurement Measurement range 0.1 – 600.0 V Resolution 0.1 V Intrinsic uncertainty ± (1 % R + 1 ct) the meter displays >700.0 V. For voltage above 700 V Input impedance: 1.3 MΩ Ground Resistance Testers Models 6422 & 6424... -
Page 35: Resistance Measurement (2P)
Measurement 128 Hz, or 256 Hz if the spurious voltage is at 128 Hz frequency no-load ±10 V PEAK voltage The measurement current is a square signal of not more than 20 mA. Ground Resistance Testers Models 6422 & 6424... -
Page 36: Current Measurement (Model 6424)
DC to 440 Hz -3 dB Peak factor 1.4 to 3 (up to 300 V) ± 1 % R DC and 50/60 Hz common mode (0 to 600) V 65 dB 50 dB rejection Ground Resistance Testers Models 6422 & 6424... -
Page 37: Resistance Measurement (2P)
(0 to 50) kΩ ± (2 % R + 1 Ω) < 100 x R Rod resistance and R < 50 kΩ ± (2 % R + 2 ct) ± (10 % R + 5 ct) Ground Resistance Testers Models 6422 & 6424... -
Page 38: Current Measurement (Model 6424)
= 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 % + 1 Ω Ground Resistance Testers Models 6422 & 6424... -
Page 39: Environmental Conditions
Altitude < 6500 ft (2,000 m) 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 h. NOTE: During charging, the instrument cannot make measurements. -
Page 40: Mechanical Specifications
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 61326-1. Ground Resistance Testers Models 6422 & 6424... -
Page 41: Maintenance
(603) 742-2346 repair@aemc.com E-mail: (Or contact your authorized distributor.) Contact us for the costs for repair, standard calibration, and calibration traceable to N.I.S.T. NOTE: You must obtain a CSA# before returning any instrument Ground Resistance Testers Models 6422 & 6424... -
Page 42: Technical Assistance
AEMC Instruments will repair or replace the faulty material ® at our discretion. www.aemc.com/warranty.html REGISTER ONLINE AT: Ground Resistance Testers Models 6422 & 6424... -
Page 43: Warranty Repairs
Phone: (800) 945-2362 (Ext. 360) / (603) 749-6434 (Ext. 360) Fax: (603) 742-2346 repair@aemc.com E-mail: Caution: To protect yourself against in-transit loss, we recommend that you insure your returned material. NOTE: You must obtain a CSA# before returning any instrument. Ground Resistance Testers Models 6422 & 6424... - Page 44 03/23 99-MAN 100517 v04 AEMC Instruments ® 15 Faraday Drive • Dover, NH 03820 USA Phone: (603) 749-6434 • (800) 343-1391 • Fax: (603) 742-2346 www.aemc.com © Chauvin Arnoux , Inc. d.b.a. AEMC Instruments. All Rights Reserved. ® ®...
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