Monroe Electronics Electrostatic Voltmeter - Isoprobe® - model 244A - Manual (Page 4)

4
BEWARE - - HIGH VOLTAGE
GENERAL:
Monroe Electronics ISOPROBE instruments are non- contacting voltage
followers.
This means an instrument indicating 1500 volts has its probe operating at
1500 volts off ground.
If it is accidentally touched, the probe will apply VERY BRIEFLY 1500
volts to the unwary participant.
Typically, a spark will jump which will be disturbing but not hazardous
electrically, (but you could recoil from the surprise and hurt yourself.)
SHORT CIRCUIT CURRENT:
The short circuit current that can be delivered by an ISOPROBE Volt-
meter is limited to approximately 500
µ A which is below the threshold of
feeling for most people and therefore is clearly no hazard.
STORED ENERGY:
The high voltage spark is caused by the discharge of the capacitance of
the system through the body. This stored energy is typically in the order
of a few millijoules while the lethal level of stored energy has been
approximated at 27 joules.
A safety factor of better than 1000:1 therefore exists.
ALTHOUGH THE SPARK IS CLEARLY ANNOYING, IT WON'T HARM
YOU UNLESS YOU OVERREACT.
MONROE ELECTRONICS, INC.
LYNDONVILLE, NEW YORK
14098