Chapter II
Digital Earth Tester
43
4. Technical specifications
4.1. Functional
specifications
(Accuracy = n % L + n D, means "n % of r n Digits" according to IEC 485).
4.1.1. Continuity (IEC 61557-4, 1997)
Range
0.10 - 20.00
:
Resolution
0.01
:
Accuracy
from 0.10
:
to 0.12
:
: -
± 3 D
from 0.13
:
to 0.19
:
: 2 % ± 4 D
from 0.20
:
to 20.0
:
: 2 % ± 5 D
Measuring current
> 200 mA
DC
Voltage at open circuit
4 V
d
V
d
24 V
DC
Protection
480 Vrms
Beeper threshold
2
:
± 0.15
:
Switching over the test leads inverts the current flow, thus providing
R AVG =
2
R2
R1
, where R1 and R2 are measured with opposite flow directions.
4.1.2. Earth (IEC 61557-5, 1997)
Rating
0.15 - 20.00
:
15 - 2000
:
Resolution
0.01
:
1
:
Accuracy
0.15
:
to 0.20
:
: 2 % ± 4 D
0.21
:
to 0.50
:
: 2 % ± 5 D
0.51
:
to 20
:
: 2 % ± 8 D
15
:
to 50
:
: 2 % ± 4 D
50
:
to 2000
:
: 2 % ± 5 D
Max. output current
< 5 mA
< 5 mA
Voltage at open circuit
< 25 V
< 25 V
U
TEST
frequency
1024 Hz
1024 Hz
Protection
480 Vrms
480 Vrms
4.1.3. R LOOP
Range
0,00 -
ȍ
0 -
ȍ
Resolution
ȍ
ȍ
Accuracy
± 2.0 % ± 8 D
± 2.0 % ± 5 D
Max. output current
< 5 mA
< 5 mA
Off-load voltage
< 25 V
< 25 V
U
TEST
frequency
1024 Hz
1024 Hz
Protection
480 V
RMS
480 V
RMS
