Coupling Measurement (3-Pole Measurement); Connections; Pre-Measurement Settings - Chauvin Arnoux C.A 6470 Manual De Instrucciones

(1)
Operating error
Resistance of rods R and R
H
Measurement range
Resolution
Intrinsic error
(1)
with spurious voltages ≤ 60V
signal frequency > 0.2 x measurement frequency.

4.4 COUPLING MEASUREMENT (3-pole measurement)

This measurement is performed on the 3-pole position of the switch and in MANUAL mode only.
The earth coupling value is calculated using 3 successive earth resistance measurements :
- the first 2 measurements are two 3-pole classic measurements (see §4.3); these give
results R and R ,
1 2
- the third measurement is a 2-pole measurement which gives the result R
Once the 3 measurements have been performed, the instrument automatically calculates the coupling
resistance R as follows :
C
As well as the coupling factors C
and the resistances R and R
A
4.4.1

CONNECTIONS :

See above, §4.3.1.
4.4.2

PRE-MEASUREMENT SETTINGS

Configure the instrument for an EARTH COUPLING measurement:
- set the rotary switch to the 3-pole position,
CONFIG CONFIG CONFIG
- using the key, select the MANUAL mode, then EARTH COUPLING.
DISTANCE DISTANCE
CONFIG CONFIG CONFIG
Once again, using the
DISTANCE DISTANCE
- select the measurement frequency (41, 55, 92, 110, 119, 128, 476 Hz, or USr
- select the voltage applied (16 or 32 V).
(1)
The frequency "USr" is defined by the user for between 41 and 512 Hz using the
R and/or R ≤ 20kΩ
H S
R /R and/or R /R
H E S
Measurement freq. btw 41 and 300 Hz
R and/or R ≤ 100kΩ
H S
R /R and/or R /R
H E S
Measurement freq. btw 41 and 150 Hz
R and/or R ≤ 20kΩ
H S
R /R and/or R /R
H E S
Measurement freq. btw 300 and 500 Hz
S
0.01 – 9.99Ω 10.0 – 99.9Ω
0.01Ω 0.1Ω
± (10% + 2pt) at 128 Hz
and difference between measurement frequency and spurious
peak
R = (R + R - R
C 1 2 1-2
and C defined by :
1 2
C = R / R and C
1 C 1
defined by :
B
R = R - R and R
A 1 C B
key, you can then:
46
± (5% + 2pt)
≤ 5000
E
± (20% + 3pt)
≤ 20000
E
± (10% + 1pt)
≤ 1000
E
100 - 999Ω 1.00 – 9.99kΩ 10 – 99.9kΩ
1Ω 10Ω
.
1-2
) / 2
= R / R
2 C 2
= R - R
2 C
100Ω
(1)
),
keys.