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Measurement of High Voltage and Currents

Impulse Voltage Test System

Impulse Voltage Test System: It is extremely difficult to control and adjust the Impulse Voltage Test System wave shapes for different load conditions as in the case of large capacitive loads, very low inductors or coils, transformers with high inductance and capacitance. Further whenever the tests require comparison of test records, the resolution and uncertainty …

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Multiple Shield Enclosures

Impulse measurements using Multiple Shield Enclosures and Signal Cable: Multiple Shield Enclosures – It is essential that leads, layout, and connections from the signal sources to the CRO are to be arranged such that the induced voltages and stray pick-ups due to electromagnetic interference are avoided. For slowly varying signals, the connecting cables behave as either …

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Cathode Ray Oscillograph for Impulse Measurements

Cathode Ray Oscillograph for Impulse Measurements: Modern Cathode Ray Oscillograph for Impulse Measurements are sealed tube, hot cathode oscilloscopes with photographic arrangement for recording the waveforms. The cathode ray oscilloscope for impulse work normally has input voltage range from 5 m V/cm to about 20 V/cm. In addition, there are probes and attenuators to handle signals up …

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Low Ohmic Shunt

Low Ohmic Shunt: The most common method employed for high impulse current measurements is a Low Ohmic Shunt shown in Fig. 7.46. The equivalent circuit is shown in Fig. 7.46b. The current through the resistive element R produces a voltage drop V(t) = i (t)R. The voltage signal generated is transmitted to a CRO through …

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Low Voltage Arms for Voltage Divider

Low Voltage Arms for Voltage Divider: Low Voltage Arms for Voltage Divider – The mode of connection and the layout arrangement of the secondary arm of the divider is very critical for the distortion less measurement of fast transients. The L.V. arm of the divider itself introduces large distortions if not properly connected. Different corrections …

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Capacitance Voltage Dividers

Capacitance Voltage Dividers: Capacitance voltage dividers are ideal for measurement of fast rising voltages and pulses. The capacitance ratio is independent of the frequency, if their leakage resistance is high enough to be neglected. But usually the dividers are connected to the source voltage through long leads which introduce lead inductances and residual resistances. Also, …

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