Method of implementation of peak hold in a phasing voltmeter

A high voltage portable phasing voltmeter comprising:

• a first probe comprising an elongate insulated shield, an electrode extending from a distal end of the shield for contacting a high voltage electrical conductor, and a resistor in the shield connected in series with the electrode;
• a second probe comprising an elongate insulated shield, an electrode extending from a distal end of the shield for contacting a high voltage electrical conductor, and a resistor in the shield connected in series with the electrode;
• and
• a meter comprising a housing enclosing a peak hold selector switch and an electrical circuit for measuring true rms voltage, the electrical circuit comprising an input circuit for connection to the first and second probe resistors and developing a scaled voltage representing measured voltage across the electrodes, a converter circuit for converting the scaled voltage to a DC signal representing true rms value of the measured voltage, a peak hold circuit connected to the converter circuit to hold a peak value of the true rms value and a display connected to the peak hold circuit for displaying the measured voltage and selectively displaying the peak value of the true rms value when the peak hold selector switch is enabled.

A high voltage portable phasing voltmeter comprising:

• a first probe comprising an elongate insulated shield, an electrode extending from a distal end of the shield for contacting a high voltage electrical conductor, and a resistor in the shield connected in series with the electrode;
• a second probe comprising an elongate insulated shield, an electrode extending from a distal end of the shield for contacting a high voltage electrical conductor, and a resistor in the shield connected in series with the electrode;
• and
• a meter comprising a housing enclosing an electrical circuit for measuring true rms voltage, the electrical circuit comprising an input circuit for connection to the first and second probe resistors and developing a scaled voltage representing measured voltage across the electrodes, a converter circuit for converting the scaled voltage to a DC signal representing true rms value of the measured voltage, a peak hold element connected to the converter circuit to hold a peak value of the true rms value and a display connected to the peak hold element for displaying the peak value of the true RMS value, wherein a rectifier circuit has an input connected to the converter circuit and having an output connected to the peak hold element comprising a capacitor to hold the peak value of the true rms value.