C.A 6470
Earth
and resistivity
tester
A complete, rapid appraisal of earths
MULTI-FUNCTION
? Earth resistance
? Earth coupling
? Soil resistivity
? Continuity / Resistance
ERGONOMIC
? Rugged, water-tight field casing
? Giant back-lit LCD display
? Direct access to the measurements
by selector switch
? Battery can be recharged from mains
or vehicle cigar lighter
RELIABLE & ACCURATE
? Uses conventional
rod methods
? Automatic recognition
of poor connections
or presence of parasitic
voltage
EFFECTIVE
? Extensive measurement range: resistance from 0.01 to 100 k
? ?
? Possibility of selecting measurement frequency from 41 Hz to 512 Hz
? Automatic calculation of earth coupling coefficient and of soil
resistivityEARTH MEASUREMENT BY 3-ROD METHOD
Traditional method using rods to measure the resistance R of an existing earth electrode
E
The resistances of the auxiliary rods, R and R , can also be measured.
S H
The user can choose the measurement frequency between 41 Hz and 512 Hz;
the instrument also does this automatically.
CHARACTERISTICS
? range of resistance R : from 0.01 to 100 k
E ? ?
? choice of measurement voltage: 16 or 32 Vrms
? adjustable measurement frequency: 41 to 512 Hz
? R and R : measurement from 0.01 to 100 k
S H ? ?
? U maximum 60 V
parasitic peak
UTILITY OF CHOOSING
THE MEASUREMENT
FREQUENCY:
the instrument or the user chooses
the measurement frequency
at which the influence
of parasitic voltage
is least.
Particular measurement:
EARTH COUPLING MEASUREMENT
To estimate the mutual influence of 2 earth resistances that are not connected to one another,
it is essential to calculate the coupling coefficient, which must be as low as possible.
The operator makes 3 successive measurements (2 conventional earth measurements by the 3-rod method - R
1
& R - and 1 earth measurement by the 2-rod method – R ) and the instrument automatically calculates the
2 1-2
coupling resistance:
Rc = (R + R – R ) / 2
1 2 1-2
MT network BT network MT network BT network MT network BT network
Phase Phase Phase
Neutral Neutral Neutral
(Same characteristics
as the conventional
earth measurement by
the 3-rod method)SOIL RESISTIVITY MEASUREMENT
When it is possible to choose the location of the earth electrode, the resistivity measurement serves
to qualify the soil and so determine the location where the earth resistance will be lowest
(optimization of construction costs).
The C.A 6470 automatically calculates the soil resistivity by the Wenner or Schlumberger method,
ρ
as soon as the distances between the rods have been programmed.
The resistances of the rods, R , R , R and R , can also be measured.
E ES S H
The measurement frequency can also be chosen.
CHARACTERISTICS
? range of resistance R : from 0.01 to 100 k
S-SE ? ?
? choice of measurement voltage: 16 or 32 Vrms
? adjustable measurement frequency: 41 to 128 Hz
? R , R , R and R : measurement from 0.01 to 100 k
E ES S H ? ?
? U maximum 60 V
parasitic peak
? automatic calculation of by the Wenner or Schlumberger method if distances entered
ρ
Reminder
methods of calculation of soil resistivity
ρ
?WENNER METHOD: ?SCHLUMBERGER METHOD:
- the distances between the 4 rods are identical: d - the distance between the 2 inner rods S & ES is A
- = 2. .d.R -the distance between the 2 outer rods E & H is 2d
ρW π S-ES
- = ( .(d2-A2/4).R ) /4
ρS π S-ES

您好，C.A 6470 Earth and Resistivity Tester是一款專業(yè)的地電阻和導(dǎo)電率測(cè)試設(shè)備。它主要用于測(cè)量土壤、地下水位、建筑物地基、電纜線路等的電阻值，以評(píng)估其導(dǎo)電性能和安全性。這款設(shè)備通常用于電氣工程、地質(zhì)勘查、環(huán)境監(jiān)測(cè)以及電力設(shè)施維護(hù)等領(lǐng)域。通過(guò)C.A 6470，您可以快速準(zhǔn)確地了解地下的電導(dǎo)狀況，這對(duì)于接地系統(tǒng)的優(yōu)化和故障排查非常重要。如果您有關(guān)于該設(shè)備的操作、功能或使用上的問(wèn)題，歡迎隨時(shí)向我提問(wèn)。