Gossen MetraWatt WZ11 Series, Руководство по эксплуатации

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4. CHARACTERISTICS
4.1 Reference conditions
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Temperature : + 20... + 26°C
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Humidity : 20... 75% RH
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Conductor centred in jaws
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Sinusoidal current : 48... 65 Hz
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Distortion factor : < 1%
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Direct current : no
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Continuous magnetic field: earth field (< 40A/m).
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Proximity of external conductors : no current
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Measuring device impedance :
• WZ11A : 1
Ω
• WZ11B : > 1 M
Ω
4.2 Specifications and references for ordering
Typical Output
Model Reference Input / In accuracy Connec- protected
to ouput ratio Range at tion from
over
order In
voltage
Alternating current output
WZ11A
Z108A 1 A~ / 1 mA~ 200 A 1% Lead No
Alternating voltage output
WZ11B Z108B
1 A~ / 10 mV~ 200 A
1% Lead
1 A~ / 100 mV~ 20 A
4.3 Precision and dephasing
n
200 A calibre
Intensity in A~ 0.5 à 10 A 10 à 40 A 40 à 100 A 100 à 240 A
Intrinsic error (1)
≤
3 %
≤
2.5 %
≤
2 %
≤
1 %
Dephasing (2)
≤
5 °
≤
3 °
≤
2.5 °
(1) As ± % of the ouput signal (2) + 5 mV (WZ11B)
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20 A calibre (WZ11B)
Intensity in A~ 0.1 à 20 A (24 A maxi)
Intrinsic error
≤
1 % + 50 mV
4.4 Conditions of use
The miniclamps must be used in the following conditions, in order to comply with
user safety and metrological performance requirements.
4.4.1 Overloads
Limit measuring time above 200 A.
Intensity I < 200 A~ 200 A~ < I < 240 A~
Operation Permanent (1)
10 min. ON
followed by 30 min. OFF
(1) With a frequency F < 1kHz and a peak factor Fc < 3