Reference Conditions; Precision And Dephasing; Conditions Of Use - Gossen MetraWatt WZ11 Instrucciones De Servicio

4. CHARACTERISTICS

4.1 Reference conditions

Temperature : + 20... + 26°C
Humidity : 20... 75% RH
Conductor centred in jaws
Sinusoidal current : 48... 65 Hz
Distortion factor : < 1%
Direct current : no
Continuous magnetic field: earth field (< 40A/m).
Proximity of external conductors : no current
Measuring device impedance :
• WZ11A : 1 Ω
• WZ11B : > 1 MΩ
4.2 Specifications and references for ordering
Model Reference Input /
to ouput ratio
order
Alternating current output
WZ11A Z108A 1 A~ / 1 mA~
Alternating voltage output
1 A~ / 10 mV~
WZ11B Z108B
1 A~ / 100 mV~

4.3 Precision and dephasing

200 A calibre
Intensity in A~ 0.5 à 10 A
Intrinsic error (1) ≤ 3 %
Dephasing (2)
(1) As ± % of the ouput signal (2) + 5 mV (WZ11B)
20 A calibre (WZ11B)
Intensity in A~
Intrinsic error

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~
Operation Permanent (1)
(1) With a frequency F < 1kHz and a peak factor Fc < 3
Typical Output
In accuracy Connec- protected
over
Range at tion from
voltage
In
200 A 1% Lead No
200 A
1% Lead
20 A
10 à 40 A 40 à 100 A 100 à 240 A
≤ 2.5 % ≤ 2 % ≤ 1 %
≤ 5 ° ≤ 3 ° ≤ 2.5 °
0.1 à 20 A (24 A maxi)
≤ 1 % + 50 mV
200 A~ < I < 240 A~
10 min. ON
followed by 30 min. OFF
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