Prostat PRV-813 User manual

Brand: Prostat

Model: PRV-813

Type: User manual

This manual is also suitable for

PRV-815

User Manual

PRV-813

CONDUCTIVE RUBBER ELECTRODE VERIFIER

PROSTAT® PRVͳ813 CONDUCTIVE RUBBER ELECTRODE VERIFIER

SecƟ on Topic Page

I. Introduc on 4

II. Using the PRV-813 Fixture for measuring Electrode Flatness 5

III. Using the PRV-813 Fixture for measuring Electrode Total Resistance 8

General Speciﬁ ca ons 10

Table of Contents

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. A / May 2016

PRV-813 Conduc ve Rubber Electrode Veriﬁ er

I. IntroducƟ on

The PRV-813 is a two-sided ﬁ xture designed to assess the ﬂ atness of

conduc ve rubber electrodes, and their total resistance to surfaces

under test. While virtually all 5 pound, 2.5 inch electrodes in industry

are perfect when delivered to their end users, over  me they may

change considerably. Varia on in electrodes may be due to extreme

use, contamina on, poor storage or ambient condi ons, general

wear, rough handling, and degrada on over  me.

This is not a cri cism of electrodes or their manufacturers. Rather,

electrode degrada on is a reality. Over 70% of all audit and periodic

veriﬁ ca on measurements made in support of ANSI/ESD S20.20 and

IEC ESD Program Standards are conducted using 5 pound, 2.5 inch

electrodes. Consequently, a set of electrodes may be required to

make several thousand measurements each year. Rarely are these

important ﬁ xtures assessed for resis ve performance or ﬂ atness.

The PRV-813 is intended for use by ESD Prac  oners and material

suppliers for the Qualiﬁ ca on of products, surfaces and materials to

current industry standards.

Fixture Design Concept for Flatness Indica on

The upper test surface is a blue masked, extra thick printed circuit

board (PCB) assembly consis ng of 20 test pads each connected to 10

megohm (1.0x107) ±1% resistors. See Figure 1, above. The 20 resis-

tors are a ached to each other in parallel.

• If all 20 pads are connected together, comple ng the parallel

circuit, the total resistance of the ﬁ xture will range from 4.95x105

to 5.05x105 ohms.

• When a ﬂ at conduc ve electrode is placed on the ﬁ xture, it com-

pletes the parallel circuit by contac ng all 20 test pads on the PCB.

• With the electrode connected to an ohmmeter, if the total resis-

tance of the electrode and ﬁ xture measures within the range of

the ﬁ xture, i.e., from 4.95x105 to 5.05x105 ohms, the electrode’s

contact surface is rela vely ﬂ at as compared to the ﬁ xture para

meters, i.e. 5.0 x 105 ±1%

• If the electrode’s total resistance is greater than 5.05x105, but less than 5.25x105 ohms, the elec-

trode is within 5% of the ﬁ xture’s parameters for indicated ﬂ atness.

• Higher resistance indicates that the electrode’s contact surface is not making posi ve contact with

one or more ﬁ xture pads and may require dressing before using the electrode for material qualiﬁ -

ca on purposes.

The Flatness por on of the ﬁ xture has its own dedicated instrument connec on in the ﬁ xture’s center

black ring next to the serial number label

Figure 1: PRV-813 with Blue Flatness

Test Surface and 20 test pads shown.

Note the ﬁ xture connecƟ on in the

center spacer next to the ﬁ xture’s

label.

Figure 2: Standard 5 lb., 2.5”

Electrode used for Qualifying

and Verifying Resistance of ESD

Controlled surfaces and mobile

equipment.

Rev. A / May 2016

PRV-813 Conduc ve Rubber Electrode Veriﬁ er

B. Fixture Design for Measuring Electrode resistance

The ﬁ xture’s second side is a heavy, polished, nickel plated brass test bed. This test surface is used

to measure the total resistance of the electrode. Industry stan-

dards require that the total resistance of 2 electrodes on a metal

plate shall be less than 1,000 ohms. [Ref: ANSI/ESD S4.1 Worksur-

faces] Thus, one electrode on a metal test bed shall be less than

500 ohms. When evaluated on the PRV-813 most new, good quality

electrodes measure far less than 100 ohms.

Note that the PRV-813’s metal test bed will indicate a much lower

resistance than general metal plates found in the industry. Stan-

dard test beds supplied with many resistance instruments are

made of brushed stainless steel, o en shipped with a protec ve

ﬁ lm on the test surface. The brushed surface considerably in-

creases contact resistance, and the adhesive from the protec ve

ﬁ lm o en leaves insula ve contamina on on the test surface.

Consequently, an electrode measured for resistance on a standard

brushed stainless test bed may measure 200 ohms, while its resis-

tance measurement on the PRV-813’s polished test bed may be less

than 30 ohms. The polished resistance test bed has its own dedi-

cated instrument connec on in the edge of the test bed, opposite

of the ﬂ atness instrument connec on

II. Using the PRV-813 Fixture for measuring Electrode Flatness

The PRV-813 is used in conjunc on with a precision resistance instrument and test leads, which are

not supplied. For the best accuracy, the instrument should be a digital unit with a nominal accuracy

of <±5%, and capable of displaying resistance to two decimal places. The instrument should have a

minimum measurement range of equal to or less than 1.00 ohms to greater than 1.00x109 ohms. For

Flatness measurements, typical measurements are between 4.95x105 and 1.0x108 ohms.

Measuring electrode ﬂ atness consists of three steps:

• Prepara on of the ﬁ xture and electrode to be measured

• Electrode Posi oning on Flatness ﬁ xture

• The resistance measurement

A. Electrode & Fixture Prepara on

Both the electrode being measured and the ﬁ xture must be clean

and free of even the smallest par cles of debris. Clean both sur-

faces with a solu on of 70% isopropyl alcohol (IPA) and water. Small

IPA wipes used by nurses and doctors are available in drug stores

and are typically 70/30% IPA and water.

A er cleaning, allow surfaces to dry thoroughly, typically 15 min-

utes or more. Inspect electrode and ﬁ xture surfaces for small

par cles. Use canned air to blow par cles oﬀ the test surfaces if

necessary.

Place the PRV-813 on a ﬂ at, stable surface with the blue ﬂ atness PCB facing up. Posi on the ﬁ xture

so that there is access to the ﬁ xture instrument connec on.

Figure 3: PRV-813 Shown with its

Polished Test Bed ready for an elec-

trode resistance measurement. Note

the test bed instrument connecƟ on

in the edge of the plate.

Figure 4: PRV-813 Instrument Con-

necƟ on for Flatness measurement

6Rev. A / May 2016

PRV-813 Conduc ve Rubber Electrode Veriﬁ er

Note: Install protec ve cover on metal test bed to avoid damage to its polished surface.

B. Electrode Posi oning on Flatness Fixture

The electrode must be centered on the ﬂ atness circuit board so that the electrode conduc ve

surface makes posi ve contact with each of the 20 measurement pads. Although the speciﬁ ed

diameter of the conduc ve rubber measurement pad is 2.5 inches, outer cases of electrodes made

by diﬀ erent suppliers may have various diameters. A spacer ring is provided to assist in posi oning

a variety of electrodes with diﬀ erent outer case diameters.

Figure 5: Split Ring for Flatness Fixture aids

in aligning and posiƟ oning Electrode

Figure 6: PRV-813 with Split Ring

Installed in Flatness Fixture

Typically, there are three sizes of electrode cases in the industry: Small, Medium and Large:

Figure 7: Small Elec-

trode Case with Split

Ring Installed & elec-

trode manually cen-

tered in Fixture

Figure 8: Medium Elec-

trode Case centered

in Fixture by the Split

Ring

Figure 9: Large Electrode Case,

Split Ring removed; Case Cen-

tered by Fixture’s Outer Ring

Rev. A / May 2016

PRV-813 Conduc ve Rubber Electrode Veriﬁ er

Once the electrode to be tested is properly posi oned in the center of the ﬂ atness ﬁ xture the resis-

tance instrument should be connected for measurement

C. Measuring Electrode Resistance

Connect the Posi ve (+) test voltage lead from the instrument directly to the electrode under

test. Connect the Nega ve (-) current sensing lead to the ﬂ atness electrode as shown in the below

photo.

Figure 10: Measuring Flatness Resistance of a 5 lb., 2.5 inch ConducƟ ve Rubber Electrode

IMPORTANT NOTE

Install protec ve cover on metal test bed to avoid damage to its

polished surface.

Once the instrument is connected to the electrode, measure its resistance to the ﬁ xture.

• Seat the electrode in the ﬁ xture: Apply some pressure to the electrode and rotate it slightly to

insure contact with the ﬁ xture’s 20 test pads.

• Make the ﬁ rst resistance measurement. It should be within the ﬁ xture’s range of 4.95x105 to

5.05x105 ohms. Test voltage is typically 10 V.

8Rev. A / May 2016

PRV-813 Conduc ve Rubber Electrode Veriﬁ er

◦If not within the ﬁ xture range, or 5% of the ﬁ xture range, clean or slightly sand the elec-

trode contact surface and repeat the measurement.

◦If within the ﬁ xture’s range, or 5% of the ﬁ xture’s range, proceed to the next step.

• Rotate the electrode 180o. Repeat Sea ng the Electrode and making another resistance mea-

surement.

◦Depending on user requirements, some prefer to rotate the electrode in 90o steps and

repeat the measurement a er each rota on.

If the same or similar resistance measurements were obtained for each measurement posi on and

all were within the user’s guidelines, the electrode is ready for use.

III. Using the PRV-813 Fixture for measuring Electrode Total Resistance

The PRV-813 is used in conjunc on with a precision resistance instrument and test leads, which are

not supplied. For the best accuracy, the instrument should be a digital unit with a nominal accuracy

of <±5%, and capable of displaying resistance to two decimal places. The instrument should have a

minimum measurement range of equal to or less than 1.00 ohms to greater than 1.00x109 ohms. For

electrode resistance measurements, typical measurements of new electrodes are far less than 500

ohms.

Measuring electrode resistance consists of three steps:

• Prepara on of the ﬁ xture and electrode to be measured

• Electrode Posi oning on polished plate

• The resistance measurement

IMPORTANT NOTE

Install protec ve cover on ﬂ atness ﬁ xture to prevent damage.

A. Electrode & Polished Test Bed Prepara on

Both the electrode being measured and the Test Bed must be clean and

free of even the smallest par cles of debris. Clean both surfaces with a

solu on of 70% isopropyl alcohol (IPA) and water. A er cleaning, allow

surfaces to dry thoroughly. Inspect electrode and ﬁ xture surfaces for

small par cles. Use canned air to blow par cles oﬀ the test surfaces if

necessary.

B. Electrode Posi oning on Resistance Test Bed

The electrode must be centered on the metal test bed so that the electrode conduc ve surface

makes posi ve contact with the polished plate. All por ons of the electrode’s rubber conduc ve

pad must make in mate contact with the test bed.

C. Measuring Electrode Resistance

Connect the Posi ve (+) test voltage lead from the instrument directly to the electrode under test.

Figure 11: PRV-813 Polished Nickel

Plated Brass Test Bed for Electrode

Resistance measurements. Note

Instrument ConnecƟ on in edge of

plate.

Rev. A / May 2016

PRV-813 Conduc ve Rubber Electrode Veriﬁ er

Connect the Nega ve (-) current sensing lead to the metal test bed as shown in the photo.

• Apply slight pressure to seat the electrode to the plate.

• Apply <10V to the electrode to make a low resistance measurement

• Electrode resistance must be less than 500 ohms for acceptance. Typical new electrodes are

less than 100 ohms

Figure 12: PRV-813 Shown with its Polished Test Bed ready for an electrode resistance measurement.

Note the test bed instrument connecƟ on in the edge of the plate.

10 Rev. A / May 2016

PRV-813 Conduc ve Rubber Electrode Veriﬁ er

PRV-813 ConducƟ ve Rubber Electrode Veriﬁ er Speciﬁ caƟ ons

Flatness Test Surface

Surface Resistance

Conﬁ gura on: Based on 20 each 1.0x107 (±1%) Ω Resistors in Parallel

Calculated Fixture

Resistance Range: 4.95x105 to 5.05x105 ohms

Average Range: 4.98x105 to 5.02x105 Ohms

Metal Test Bed

Descrip on: Nickel plated, polished brass

Plate Size: Diameter 4 in. (101.6 mm)

Thickness 0.387 in. (9.8 mm)

Plate Resistance: Resistance Point to Point (Rpp) on Surface <0.03 Ω

Resistance Surface to Plate Connec on <0.02 Ω

Height: 1.4 inches (35.6 mm)

Diameter: 4 inches (101.6 mm)

Weight: 1 lb. 12.8 oz. (0.9 kg)

Rev. A / May 2016

PRV-813 Conduc ve Rubber Electrode Veriﬁ er

12 Rev. A / May 2016

PRV-813 Conduc ve Rubber Electrode Veriﬁ er

NOTES

Rev. A / May 2016

PRV-813 Conduc ve Rubber Electrode Veriﬁ er

NOTES

14 Rev. A / May 2016

PRV-813 Conduc ve Rubber Electrode Veriﬁ er

Speciﬁ ca ons are subject to change without no ce.

All Prostat trademarks and trade names are the property of Prostat Corpora on.

All other trademarks and trade names are the property of their respec ve companies.

PROFESSIONAL STATIC CONTROL PRODUCTS

Prostat Corpora on

630-238-8883 • Fax: 630-238-9717 • 1-855-STATIC1 • www.prostatcorp.com

Prostat PRV-813 User manual

Brand: Prostat

Model: PRV-813

Type: User manual

This manual is also suitable for

PRV-815

Download PDF

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Prostat PRV-813 User manual

This manual is also suitable for

Prostat PRV-813 User manual

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