Amprobe DGC-1000A Manual del usuario - Página 15
Navegue en línea o descargue pdf Manual del usuario para Equipos de prueba Amprobe DGC-1000A. Amprobe DGC-1000A 20 páginas. Clamp-on ground resistance tester
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circuit is shown in Figure A. If R
then only R
and R
are left in the circuit (refer to Figure B). If a
g
eq
constant voltage is applied to the circuit, the following equation will be
derived.
where
If R
and R
, R
, ... R
are about the same, and n is a large number
g
1
2
n
(such as 200), then R
eq
zero.
Example:
If R
and R
, R
, ... R
are all 10 , respectively and n = 200. Then R
g
1
2
n
by calculation equals
R
e q
V
R
R
g
I
In this example, we can see that as long as the number of multiple
electrodes is large enough, the equivalent resistance is negligible with
respect to the ground resistance to be measured.
GlobalTestSupply
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, R
, R
, ... R
are combined as R
1
2
3
n
V
R
R
g
eq
I
1
Req
, i 1, 2, ......, n
1
Ri
will be much less than R
and maybe approach
g
(Req → 0)
R
>> R
g
eq
1
Ω
0 05
.
1
1
1
...
10
10
10
10 0.05 10.05
eq
12
,
eq
eq
R
g
.com