PVM – 100
6Pages

Internet: www.prescoag.com 1 Safety precautions 1. 1 Safety 1.2 Safety precautions 1.3 Impaired Safety Precautions 3. Technical Data 3.1 Scope of supply

Safety precautions 1.1 Safety The instrument described in this manual is designed to be used by properly trained personnel only. Adjustment, maintenance and repair of the exposed equipment should be carried out only by qualified personnel aware of the hazards involved. 1.2 Safety precautions For correct and safe use of this instrument it is essential that both operation and service personnel follow generally accepted safety procedures in addition to the safety precautions specified in the manual. Specific warning and caution statements, where they apply, will be found throughout the manual....

2.1 Function Principle The measuring instrument is a peak detecting digital voltmeter with differential input. Fig. 1 shows the principle of the measurement Fig.. 1 The input unit is a differential amplifier with 1 M input impedance. It is proposed to ground the input "UinL" and apply the voltage on the UinH input. The peak detector is an ultra –linear active peak detecting circuit. The digital voltmeter has 3.5 digits. The instrument has only one scale factor; in the given case, 100 V input results in a 100 kV display. The instrument makes one decade autoranging: at 10 kV it increases the...

3. Technical Data Peak Voltmeter To be connected to a standard capacitor with built-in capacitive divider Displayed value Display scale factor Highest input voltage to ground at any terminal Display Resolution Uncertainty Input impedance Dimensions Weight Power Mains With front and rear panel connectors Reference conditions temperature humidity altitude (pressure) Rated range of use according IEC 359 temperature humidity, non condensing altitude (pressure) 3.1 Scope of supply 1 p. peak voltmeter type PVM-100 1 p. power chord 1 p. test certificate 1 p. instruction manual

Measuring arrangements Establish a ground connection between ground of the laboratory and the ground terminal of the instrument. Because the instrument is built according to safety class I of IEC 359, the mains cable contains a ground conductor which also has to be connected to ground of the local mains. It is strictly forbidden to open the ground connection between "laboratory ground  " and "Instrument  ground of local mains"! Danger of life! Using the instrument with a divider. HV to be measured The instrument can be used with resistive, capacitive, inductive divider or voltage...

The example above shows a connection with a capacitive divider. The low voltage part of the divider must be dimensioned in a way that the 1 Mload impedance of the instrument causes lower than 1 % error. Example: The high voltage capacitor (CH) is: 100 pF For a 100 V output at 100 kV input we need a low voltage capacitor of: CL= 99 900 pF The error, resulted by the 1 Mload is:  (1/2)*( =( *R*C*L)2 )-1= 0.2% 5.2 Measurement Make the test set up using the example above. Connect input green-yellow (GROUND) to laboratory ground Connect input black (UinL) to ground point of divider Connect...