earth and resistivity testers
DESCRIPTION
Earth and Resistivity Testers. C.A 6460 & C.A 6462. SALES PRODUCT INFORMATION Electrical Testing and Safety Cécile Le Goué. Mains characteristics. 4 Resistance (automatic range selection) 4 Measurement frequency : 128 Hz 4 Open circuit voltage : £ 42V peak - PowerPoint PPT PresentationTRANSCRIPT
TEST & MEASUREMENT DIVISION
PC_GB C.A 6460/62 - 1Personal and confidential
C.A 6460 & C.A 6462
SALES PRODUCT INFORMATION
Electrical Testing and SafetyCécile Le Goué
Earth and Resistivity Testers
TEST & MEASUREMENT DIVISION
PC_GB C.A 6460/62 - 2Personal and confidential
Resistance (automatic range selection)
Measurement frequency : 128 Hz
Open circuit voltage : 42V peak
Voltage detection from 20 to 250V AC (between H &E or E&S)
Auxiliary rod resistance :Voltage circuit resistance : max 50kCurrent circuit resistance : max 50k
Mains characteristics
Measurement range Resolution Test current Accuracy Open circuit voltage
0,00…19,99 0,01 10 mA ± 2%R + 1 ct 42 Vpeak
20,0…199,9 0,1 1 mA ± 2%R + 1 ct 42 Vpeak
200…1999 1 0,1 mA ± 2%R + 3 cts 42 Vpeak
TEST & MEASUREMENT DIVISION
PC_GB C.A 6460/62 - 3Personal and confidential
A special built-for-field designVery robust case, waterproof IP67 closed et IP53 opened
A folding cover
A folding handle
TEST & MEASUREMENT DIVISION
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A complete front panel...
3 lights indicate events liable to impair results
Fuse holder
Momentary-control push-button
C.A 6462:Mains supply socket with dust cover and charge indicator
4 connecting terminals and capture bar
Large backlit LCD display
TEST & MEASUREMENT DIVISION
PC_GB C.A 6460/62 - 5Personal and confidential
Strengths : On-site case with cover for use in difficult conditions
Large backlit LCD display constantly lit for good readability as well as legibility
3 indicators for measurement liability.
Automatic selection of the measurement range and current for maximum accuracy.
Captive bar between S and ES for switching easily from 4-wire to 3-wire measurement method
easy connection : terminals are colour-coded and correspond to the colour-coded accessory leads
Rechargeable NiMH battery with internal charger (only C.A 6462)
TEST & MEASUREMENT DIVISION
PC_GB C.A 6460/62 - 6Personal and confidential
"4-rod" resistivity measurement
"3-rod" earth measurement : 62% method
"3-rod" earth measurement : triangle method
"4-rod" earth measurement : 62% or triangle methods
"4-rod" coupling measurement
Applications
TEST & MEASUREMENT DIVISION
PC_GB C.A 6460/62 - 7Personal and confidential
The soil resistivity (.m) at the depth h(3/4a) is : 2 a RR is the resistance read on the instrument
Goal : To choose the best location and shape of earthing rods and networks, before they are put in place.
Method : to place the 4 spikes in line and equidistant from the distance a.
"4-rod" resistivity measurement : Wenner method
TEST & MEASUREMENT DIVISION
PC_GB C.A 6460/62 - 8Personal and confidential
"3-rod" earth measurement : 62% method
To validate the measurement, move the S rod at + 10% and - 10% :- if the result does not vary, the measurement is correct- if not, repeat measurements while increasing distances E-H and E-S.
DE-S = 62% DE-H
Goal: check the existing earth resistance value
Method : place the 2 auxiliary rods in line with existing earth rod so that :
TEST & MEASUREMENT DIVISION
PC_GB C.A 6460/62 - 9Personal and confidential
"3-rod" earth measurement : triangle method
This method is used when it's not possible to place the rods in line :Place E, S and H in equilateral triangle.
Goal : check the existing earth resistance value RE
To validate the measurement, move the S rod from one side to the other one :- if the result does not vary, the measurement is correct- if not, repeat measurements while increasing distances.
TEST & MEASUREMENT DIVISION
PC_GB C.A 6460/62 - 10Personal and confidential
"4-rod" earth measurement : 62% or triangle methods
Follow the same validation procedure as for "3-rod" methods.
The advantage of the 4-rods method is that frees itself from the resistance of the E(x) connected cords.
Goal : check the existing earth resistance value RE
Method : - connect E and ES with the earth to be measured- place the 2 others auxiliary rods so that :DE-S = 62% DE-H or in equilateral triangle.
TEST & MEASUREMENT DIVISION
PC_GB C.A 6460/62 - 11Personal and confidential
"4-rod" coupling measurement
The coupling coefficient is : k = Rcoupling / Rmwith Rcoupling = (Rm + Rn - Rmn ) / 2
EDF recommends k < 0.15
Goal : to test the influence of one earth on another in the event, for example of lightning
Method : - measure Rm and Rn with the 62% method- measure Rmn with the "4-wire" method explained opposite
TEST & MEASUREMENT DIVISION
PC_GB C.A 6460/62 - 12Personal and confidential
TO ORDER Earth and resistivity tester C.A 6460 P01.1265.01delivered with batteries and user's manual in 5 languages
Earth and resistivity tester C.A 6462 P01.1265.02delivered with a 2m European-type mains supply lead and a user's manual in 5 languages
Replacements parts :European mains lead P01.2951.74NiMH 9.6V/3.5AH storage battery P01.2960.21HPC 0.1A fuses (pack of 10) P01.2970.121.5V alkaline LR14 battery (pack of 2) P01.2960.27
Accessories :STANDARD Earth / Resistivity kitP01.1018.23PRESTIGE Earth / Resistivity kit P01.1018.25