Benning ST 720 Bedienungsanleitung Seite 26

7.5 Contact current (direct measurement method)
Measuring range
0.10 mA - 1.99 mA
Nominal voltage:
Rated current:
Max. breaking capacity:
Max. lamp load:
Max. measuring duration:
Preset limiting value:
Resistance to external
voltages:
For non-sinusoidal current supply, an additional error has to be considered:
crest factor of > 1.4 to 2.0, additional error + 3.1 %
7.6 Cord test
- measurement of the protective conductor resistance according to 7.1
- measurement of the insulating resistance according to 7.2
- line break testing of the external conductor (L) and the neutral conductor (N)
- short-circuit testing of the external conductor (L) and the neutral conductor (N)
7.7 Tripping time measurement of RCDs
Measuring range
10 ms - 500 ms
Testing current/ polarity:
Preset limiting value:
7.8 Protective conductor current (direct measurement method) of three-phase test ob-
jects under operating conditions
Measuring range
0.25 mA - 9.99 mA
Nominal voltage:
Rated current:
Preset limiting value:
7.9 Voltage measuring on external shock-proof socket
Measuring range
50 V - 270 V
AC
Display:
- voltage between the external conductor (L) and the neutral conductor (N)
- voltage between the external conductor (L) and the ground conductor (PE)
- voltage between the neutral conductor (N) and the ground conductor (PE)
7.10 Limiting values according to DIN VDE 0701-0702 and ÖVE/ ÖNORM E 8701-1
Note:
Limiting values preset in bold are stored in the BENNING ST 720.
Protective con-
ductor resist-
ance
R
the calculated ohmic resistance value
PE
08/ 2010
Resolution
1 V
Protection class I
for cords with rated current ≤ 16 A:
≤ 0.3 Ω up to a length of 5 m,
per further 7.5 m:
additional 0.1 Ω, max. 1 Ω,
For cords with higher rated currents
applies.
BENNING ST 720
Resolution
0.01 mA
230 V ± 10 % (as mains feed-in)
16 A
3000 VA
1000 W
30 seconds
0.5 mA (protection class II)
max. 276 V
Resolution
1 ms
30 mA sinusoidal/ 0° and 180°
200 ms
Resolution
0.01 mA
3 x 400 V ± 10 % (as mains feed-in)
16 A respectively 32 A
3.5 mA
Measuring accuracy
5 % ± 2 Digit
Protection class II, III
Measuring accuracy
5 % ± 2 Digit
Measuring accuracy
5 % ± 2 Digit
Measuring accuracy
5 % ± 2 Digit
Overload protection
300 V
Line test
≤ 0.3 Ω
(see protec-
tion class I)
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