Prostat CVM-780 Manuel utilisateur

User Manual

CVM-780

CONTACT VOLTMETER

PROSTAT® CVMͳ780 CONTACT VOLTMETER

SecƟon Topic Page

I. Introducon 4

II. General Descripons 4

III. Theory of Operaon 6

IV. Notes & Cauons 6

V. Receiving & Instrument Setup 8

VI. Making Electrostac Voltage Measurements 13

VII. Performance Characteriscs & Consideraons 14

VIII. Capacitance & Accuracy 17

IX. Measuring Insulators 18

X. Recording Measurement from Analog Output 18

XI. Instrument Maintenance 19

XII. Warranty 20

General Speciﬁcaons 21

Table of Contents

manual may be used or reproduced in any manner whatsoever without wrien permission. For informaon contact

Prostat Corporaon, 1072 Tower Lane, Bensenville, IL 60106 USA

Prostat is the registered trademark of Prostat® Corporaon

4Rev. D / January 2015

CVM-780 Contact Voltmeter

I. IntroducƟon

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, ﬁxtures, automac test

ﬁxtures, 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 signiﬁcant ESD or RF generaon. Robust metal ps are supplied for

general audit and equipment measurements.

Being a true electrostac voltmeter, not a ﬁeld meter means that the CVM-780 reads real voltage, without

confusing it with electrostac ﬁeld strength, which can be disnctly diﬀerent. The CVM-780 uses a unique

acve probe design which is fully guarded and shielded for minimal interference with the surrounding E

ﬁeld. 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. General DescripƟons

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

Rev. D / January 2015

CVM-780 Contact Voltmeter

IMPORTANT NOTE

Ceramic ps are fragile and used for direct contact with ESD sen-

sive devices and assemblies. Metal ps are robust and used to

measure equipment, ﬁxtures, tools and other non-ESD sensive

elements.

C. Connect the CVM-780 to a previously tested ground to provide a

deﬁned reference for accurate measurements

D. CVM-780 intended measurement range is 0 - ±525 volts in

one volt increments. All measurements are immediately

shown in the 3 digit LED display. Polarity switching during

measurements is automac

E. The round brass front panel

ground plate is used as a

zero reference for the

instrument. Between

measurements the probe

p (ceramic or metal pin) is placed in contact with the ground

plate to conﬁrm the probe p’s zero voltage as displayed on the

panel LED. Instrument zero is adjusted using the manual adjust-

ment provided below the LED display.

F. An analog output mini-jack receptacle is provided for monitoring or recording CVM-780 measure-

ments. The analog output jack provides an output of 0.1 millivolt for each 1.0 volt measured by

the CVM-780. The output is independent of the meter indicaon to maximize response me. The

output is compable with the Prostat® PGA-710 or PGA-710B Autoanalysis System™.

G. A universal AC/DC baery charger is provided for charging the AA sized Metal Hydride recharge-

able baeries. Baery life is approximately 3.5 hours. Fully charged baeries should provide a full

day of measurements if the unit is turned OFF when not in use.

6Rev. D / January 2015

CVM-780 Contact Voltmeter

H. A small p replacement tool is supplied to prevent probe and

p damage when exchanging ps. The p should never be over

ghtened

I. An outer removable rubber boot reduces mechanical shock

during portable operaons and provides an easel stand during

use.

J. few alcohol prep wipes are included to periodically clean the

black insulator mounted at the front of the probe assembly. The wipe may be used to clean the

probe and instrument cases. DO NOT USE the alcohol wipes on the display LED.

III. Theory of OperaƟon

The CVM-780 operaon is quite unique.

A. As the probe p of the CVM-780 approaches a charged conductor it senses the conductor’s

charge. The p is driven by the probe to match the conductor’s polarity and increases p voltage

as its distance to the conductor decreases.

B. While p voltage connues to increase as it approaches the charged conductor, the CVM-780

probe p does not reach the conductor’s full voltage unl it physically contacts the charged con-

ductor.

C. At the moment of contact a small transfer of electrons occurs from the conductor to the CVM-780

p that completes the measurement. The probe p voltage will be well within

1. 5% of the conductor’s original voltage, ±2 counts from ±25 to ±525 volts, and

2. Within 10% ±2 counts at <±25 volt measurements.

Therefore the change in conductor voltage at moment of p contact is very small.

D. Though very small electron transfer occurs at moment of contact, there is no measureable “ESD”

event when employing ceramic ps. The small amount of electron transfer is controlled by both p

and probe design. Also, there is no signiﬁcant RF generated because the electron transfer is small

and “relavely slow” to avoid a discharge event.

E. The resulng measurement accuracy depends on the actual voltage of the conductor, the length

and types of probe ps, and the inﬂuences in the measurement environment. Environmental

inﬂuences include presence and movement of objects and bodies, ambient condions, and size of

objects and their distance to ground (Capacitance).

IV. Notes & CauƟons

The CVM-780 is a precision instrument designed to measure electrostac DC voltage.

Rev. D / January 2015

CVM-780 Contact Voltmeter

• Do not use the instrument or probe assembly for AC measurement applicaons

• Do not expose the instrument it to shock or excessive moisture.

• Use good measurement pracces at all mes.

Warranty is VOID if either the instrument case or probe assembly are opened or misused. There are no

user adjustments inside the instrument or probe assembly. Contact Prostat Corporaon for service, fur-

ther informaon and operaonal suggesons

WARNING

HIGH VOLTAGE: Internal instrument and probe voltage can exceed ±575 volts.

• DO NOT OPEN the instrument case or probe assembly as painful personal

shock may occur.

• DO NOT INSERT METAL OBJECTS into instrument connectors

• DO NOT CONNECT any unauthorized instrument, ﬁxture or device to the

CVM-780 instrument or probe assembly as permanent equipment damage

and, or an unsafe condion may occur.

• DO NOT USE IN FLAMMABLE OR COMBUSTABLE ENVIRONMENTS when

metal probe p is installed

CAUTION: The CVM-780 probe assembly uses very sharp pin-like ceramic and metal ps for measure-

ments that will cause painful and possibly serious injury if not handled with care.

• Keep probe p covered with supplied probe p cover when not in actual use.

• Store reserve ps in supplied foam lined plasc accessories case

• DO NOT make contact to people with ceramic or metal pin ps; REMOVE pin ps when making

personnel measurements

CAUTION: The CVM-780 instrument is designed to measure electrostac voltage on objects; Do not mea-

sure AC energized circuits with this instrument

CAUTION: The operator is grounded during normal operaons while holding the probe assembly. Do not

make contact with, or touch energized AC circuits with your free hand or the probe p assembly

CAUTION: This instrument is not intended for use in ﬂammable or combusble environments

NOTE: Ceramic and metal measurement ps are supplied with this instrument. Tips are costly to replace

and may be easily damaged. Handle them with care; store them in the supplied accessory box.

Ceramic & Metal probe Ɵps are not covered by warranty. Lost or damaged ps can be replaced by con-

tacng your Authorized PROSTAT Reseller.

NOTE: The CVM-780 must be connected to an approved ground for proper operaon and accurate mea-

surements

NOTE: The CVM-780 is powered by rechargeable metal hydride baeries. Dispose of depleted baeries in

a safe manner and in accordance with local laws and ordinance.

NOTE: DO NOT OPEN the instrument or probe assembly. There are no customer serviceable parts or ad-

justments inside the instrument package or probe assembly.

The CVM-780 has been in test and use for over 2 years prior to manufacture for general ESD applicaons.

8Rev. D / January 2015

CVM-780 Contact Voltmeter

It has proven itself reliable and quite stable. The customer should have few if any problems with this

unique instrument. If aer examining this manual and you have quesons, contact Prostat or its Autho-

rized Resellers for assistance. See the “Warranty” secon later in this document for detailed informaon

regarding further coverage and support.

Prostat Corporaon assumes no liability in the event of instrument misuse, ignoring above Notes, CAU-

TION’s and WARNING’s. Should the instrument be opened or serviced by unauthorized personnel or dam-

aged by misuse, all liability, repair, replacement and freight costs are the customer’s responsibility.

V. Receiving & Instrument Setup

The CVM-780 meter assembly, probe and accessories set is shipped in foam lined shipping package and

includes the following items:

A. CVM-780 Meter Assembly with 4 each rechargeable Metal Hydride baeries (AA size) installed

during inial assembly and test.

B. Rubberized “boot” to enhance instrument protecon during mobile operaons, which incorpo-

rates an easel stand to assist viewing during measurements.

C. CVM-780 Probe assembly is an acve assembly equipped with precision electronics. Its sensing p

is protected by a removable p cover.

D. Probe/Meter DB-9 style cable connects the meter assembly and acve probe

E. Universal baery charger for recharging installed metal hydride baeries

BCD

Rev. D / January 2015

CVM-780 Contact Voltmeter

F. Accessories box containing

1. 2 Metal probe ps, approximately 0.9 and 0.4 inches

2. 2 Ceramic probe ps, approximately 0.9 and 0.4 inches

3. Tip installaon and removal tool

G. Q007B ESD Grounding Cube for connecng to equipment ground in

North American facilies

H. PFP-861LL 72 Inch Green ground lead

I. Heavy duty bulldog clip supplied for connecon to ESD common point ground points

CVM-780 Contact Voltmeter

Probe Assembly

6 . DB-9 Connecon Cable

Q007B ESD

Grounding Cube

Universal Baery Charger

PFP-861LL 72 inch Green

Lead

Pin Set & Tool

GHI

Analog Connecon

Cable

10 Rev. D / January 2015

CVM-780 Contact Voltmeter

Front Panel Side Panel

Low BaIndicator

Manual Zero

LED

Display

Ground

Plate

J. Before using the CVM-780 fully charge the

metal hydride baeries using supplied universal

baery charger.

1. Plug charger into a standard AC outlet. Use

appropriate adapter if necessary.

2. Plug charger’s DC output connector ﬁrmly

into the CVM-780 charging receptacle locat-

ed in the side panel of the Meter assembly

3. Baery charging LED will be ORANGE during

charging and GREEN when charge is com-

pleted.

4. Disconnect the charger from AC when

charge is complete and for mobile operaons

K. Install a ceramic or metal probe measurement p at the front end of the probe assembly

1. Remove the p cover by PULLING it straight oﬀthe probe. Avoid twisng the cover during its

removal or installaon.

2. Select an appropriate p from the accessory box.

CAUTION: Probe Tips have very sharp points – handle them with care to avoid injury

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