Prostat CVM-780 - Making Electrostatic Voltage Measurements

13
Rev. D / January 2015
CVM-780 Contact Voltmeter
VI. 
The CVM-780 is designed to measure electrostac voltage on conductors without discharging the object
in queson. When using metal probe ps, a slight voltage dierenal during metal to metal contact will
cause low level ESD and RFI generaon. When using a ceramic probe p small ESD events and low level
RFI generaon are avoided. Use the following guidelines for making measurements on conductors. These
procedures assume the above receiving and setup steps above are completed, and all cauons and warn-
ings are followed.
1. Release the easel stand at the back of the unit and stand the
CVM in a semi vercal posion.
Place the instrument on a stable plaorm, or hand hold the
instrument with the easel retracted
2. Locate the power switch on the side panel and slide it toward
the meter’s front end to the ON posion.
a. The front panel LED display will illuminate
b. The instrument is energized for operaon
3. Remove the probe p cover by pulling it straight o. Do not twist the cover unnecessarily.
4. Place the probe p in direct contact with the round brass ground plate on the instrument’s
front panel
a. The LED should indicate 000
b. To adjust LED indicaon while the probe is grounded, turn the sloed Manual Zero knob
unl the LED indicates 000
Ground the p using this procedure between measurements

When the probe p is not in contact with ground or making a dened measurement,
the measurement system is “oang”. When oang free of a contact measurement any
indicated displayed voltage is normal and not meaningful. (See Instrument
Maintenance, below.)