p i c lt d .co m
5
pri nci ples of operation
The SPY
®
Model JM JeepMeter (voltmeter) is an instrument designed
to provide accurate and reliable measuring of the crest value of high
voltage non-sinusoidal waveforms. The output wave form of holiday
detectors typically has this type of shape and therefore prevents the
use of conventional RMS voltmeters.
The Model JM enables the operator to measure DC up to 7,000 kV or
pulse up to 35 kV.
Holiday detectors output both types of waveforms depending on the
type of coating they are being used on. For example, the SPY
®
785 and
790 holiday detectors have pulse only output used for inspecting tapes,
extruded coatings, coal tar enamels and sometimes thin film epoxy
coatings and has a voltage range of 1 to 15 kV (785) and 5 to 35 kV (790)
respectively. The SPY
®
780 holiday detector is a DC output used for thin
film epoxy coatings and has an output voltage range of 1 to 5 kV.
