Earth and Resistivity Testers

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

PC_GB C.A 6460/62 - 4Personal and confidential

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