AEMC 6470-b User Manual page 21

Max.Value for R
Calculation Formula, Wenner: ρ
Calculation Formula, Schlumberger: ρ
Maximum Value of
Measuring Time:
Measurement
Range
Resolution
Intrinsic error
The intrinsic error specified refers to reference conditions with a test voltage of
32V, test frequency of 128Hz, R
Operating conditions : R
R is the resistance of the earth rods R
rod
cal.
Note: With a test voltage U
Measurement of Auxiliary Electrodes R
Measurement
Range
Resolution
Operating error
The START button must be pressed for more than 2s. For frequencies between 41
and 128Hz, the resistance of the auxiliary earth electrodes is measured at the test
frequency set. At higher frequencies the resistance is measured at 128Hz.
Ground Resistance Tester Model 6470-B
uality Products Online at:
, R , R , R : 100kΩ
H S ES E
= 2p d R
W
ρ
: 999kΩm (display in kΩft is not possible)
Short push on START: approx. 8 s for first value of R
128 Hz, then 3 measurements per s.
Long push on START: approx. 20 s for first value of R
128 Hz, then 3 measurements per s.
0.00 to 10.0 to
9.99Ω 99.9Ω
0.01Ω 0.1Ω
, R
ρ-H
< 3 x R
ρ
-H
S-ES
≤ 100kΩ
R
electrode
≤ 2000
R / R
electrode S-ES
≤ 50kΩ
R
electrode
≤ 10,000
R / R
electrode S-ES
≤ 10kΩ
R
electrode
≤ 20,000
R / R
electrode S-ES
of 16V, halve the value of R
OUT
0.14 to 10.0 to
9.99Ω 99.9Ω
0.1Ω 0.1Ω
GlobalTestSupply
www.
S-ES
= (p (d2 - (A/2)²) / A) R
S
100 to
999Ω
1Ω
± (2% + 1ct)
, R and R = 1kΩ, no external voltage.
ρ-S ρ-ES ρ-E
and: Operating error for R
, R , R , R
ρ ρ ρ
-E -ES -E
, R , R
ρ ρ ρ
-H -S -ES
100 to
999Ω
1Ω
± (10% + 2cts)
.com
S-ES
1.00 to 10.0 to
9.99kΩ 99.9kΩ
10Ω 100Ω
S-ES
± (7% + 2cts)
± (15% + 3cts)
± (20% + 1ct)
assumed to be identi-
ρ
-H
.
rod
, R
ρ
-E
1.00 to 10.0 to
9.99kΩ 99.9kΩ
10Ω 100Ω
sales@GlobalTestSupp
at
S-ES
at
S-ES
19