Prostat CVM-780 - Introduction; General Descriptions

4
Rev. D / January 2015
CVM-780 Contact Voltmeter
I. 
The Prostat CVM-780 is a portable high impedance voltmeter with
an acve probe system used for locang and measuring electrostac
potenals on conductors and other materials. Its intended purpose
is to determine voltages on crical conductors such as devices and
assemblies in electronics industry manufacturing and test environ-
ments. It is indispensible for
• Analyzing the electronic manufacturing/test/repair process
to determine levels of protecon for ESD sensive devices
from Machine Model (MM) and Charge Device Model
(CDM) damage, and
• Locang cause(s) of ESD failures.
• Measuring voltages on devices, subassemblies, assembly equipment, xtures, automac test
xtures, tools, chassis, mobile equipment, dissipave materials, etc.
The CVM-780 Contact Voltmeter™ combines the ease of use of a digital voltmeter with the high input im-
pedance and low input capacitance of a true electrostac voltmeter in a small, portable, baery operated
package. The contact probe enables you to measure voltages with pinpoint accuracy. Ceramic Probe Tips
allow accurate measurement without signicant ESD or RF generaon. Robust metal ps are supplied for
general audit and equipment measurements.
Being a true electrostac voltmeter, not a eld meter means that the CVM-780 reads real voltage, without
confusing it with electrostac eld strength, which can be disnctly dierent. The CVM-780 uses a unique
acve probe design which is fully guarded and shielded for minimal interference with the surrounding E
eld. The CVM-780 is powered by rechargeable Nickel Metal Hydride baeries; a compact universal bat-
tery charger is supplied for internaonal use. Properly used, the CVM-780 Contact Voltmeter will become
one of your most valuable portable ESD Analysis tools.
II. 
The CVM-780 features a large easy to read LED display, analog output, and rechargeable baery in a shock
absorbent package, and a specially designed acve probe assembly.
A. The probe assembly is connected to the CVM-780 case using
a supplied 6-foot DB9 cable
B. Ceramic or metal probe ps are used to make direct contact
with objects and surfaces under test. Voltage is shared with
the probe assembly, the measurement is calculated, and
shown on the LED display