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…
Measurement of High Direct Current: High magnitude direct currents are measured using a resistive shunt of low ohmic value. The voltage drop across the resistance is measured with a millivoltmeter. The value of the resistance…
Peak Reading Voltmeter Circuit: Sometimes it is enough if the Peak Reading Voltmeter Circuit of an impulse voltage wave is measured; its waveshape might already be known or fixed by the source itself. This is…
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…
Mixed RC Potential Divider: Mixed RC Potential Divider use R-C elements in series or in parallel. One method is to connect capacitance in parallel with each R′1 element. This is successfully employed for 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…
Potential Dividers for Impulse Voltage Measurements: Potential or voltage dividers for high voltage Impulse Voltage Measurements, high frequency a.c. measurements, or for fast rising transient voltage measurements are usually either resistive or capacitive or mixed…
Uniform Field Electrode Gaps: Sphere gaps, although widely used for voltage measurements, have only limited range with Uniform Field Electrode Gaps. Hence, it is not possible to ensure that the sparking always takes place along…
Factors Influencing the Sparkover Voltage of Sphere Gaps: Various factors that affect the sparkover voltage of a sphere gap are: nearby earthed objects, atmospheric conditions and humidity, irradiation, and polarity and rise time of voltage…
Sphere Gaps are used to measure Voltage Measurement: Sphere Gaps are used to measure Voltage Measurement - A uniform field spark gap will always have a sparkover voltage within a known tolerance under constant atmospheric…
