Presco
AG
Manual_PVM100-Englisch.DOC/ PO/19.07.07
Page 3 of 6
2.
Introduction
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 "U
inL
" and apply the voltage on the U
inH
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 resolution.
