Prostat PRF-922B User manual

PRF-922B
User Manual
MINIATURE TWO-POINT PROBE SET

PROSTAT® PRFͳ922B MINIATURE TWOͳPOINT PROBE SET
SecƟon Topic Page
I. Introducon & Descripon 4
II. Cauons & Warnings 4
III. PRF-922B Micro Probe & PRV-913B Verifier Operaons 6
IV. Using the PRF-922B as a One-Point Probe 10
V. Material & Device Measurements with Single Pin Probe 10
VI. Resistance to Ground (Rtg) Measurements 11
VII. Handling & Maintenance 12
VIII. Warranty Informaon 13
General Specificaons 15
Table of Contents
Copyright © 2012 by Prostat® Corporaon. All rights reserved. Printed in the United States of America. No part of this
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. 2 / 3-18-2019
PRF-922B Miniature Two-Point Probe Set
I. IntroducƟon & DescripƟon
The PRF-922B Miniature Two-Point Resistance Fix-
ture Set accurately measures surface resistance of
small areas. It consists of a PRF-922B Two-Point Re-
sistance Fixture assembly, shielded cable equipped
with BNC connectors; probe cover, and a BNC to
male banana adapter.
The PRF-922B works in conjuncon with a wide
range resistance instrument, such as the Prostat
PRS-801 Resistance System, PRS-812 Resistance
Meter, or ESD Check ESI-870 Resistance Indicator,
and an insulated test bed. This instrument and
fixture combinaon provides direct point-to-point
resistance measurements in ohms across the sur-
face of small parts and assemblies.
A. PRF-922B Two-Point Resistance Fixture Descrip-
on
This precision fixture consists of 2 gold plated,
spring-loaded contact electrodes spaced 0.250 inches (6.35mm) apart, center-to-center. The elec-
tronic quality gold plated contact probes are 0.1-inch (2.54mm) in diameter, and are supplied with
conducve synthec rubber contact boots, which are 0.125-inch (3.18mm) diameter. The conduc-
ve boots are used to reduce contact resistance between the gold contact probes and materials
under test in certain applicaons.
1. The resistance measurement range of the PRF-922B fixture is 0.9 ohms at <10 volts to 1.0E+12
(1.0x1012 ) ohms at 100 volts.
2. Contacts are pogo-pin type ATE quality probes made of beryllium Copper, coated with 60 micro
inch of hard Gold. Spacing allows for measurement of items with surfaces approximately 0.125
inches wide having a length of 0.32 inches or larger.
3. The contact assembly’s outer housing incorporates “stops” that insure consistent contact pres-
sure during measurement.
4. Overall size of the PRF-922B is 0.50 inches in diameter by 7.0 inches (178 mm) long. This op-
mal size and shape make the fixture very comfortable and easy to handle. Its outer housing is
made of black anodized aluminum.
II. CauƟons & Warnings
As with any electrical device, use proper electrical precauons and measurement pracces to avoid
personnel shock. Read this manual in its enrety before aempng to use these products.
NOTE
This manual displays Cauons and Warnings alerng the user to hazardous operaon and ser-
vicing condions. CAUTION or WARNING headings throughout this publicaon flag this infor-
maon, where appropriate. Follow all Cauon and Warning instrucons at all mes.
Figure 1: PRF-922B Miniature Two-Point Resistance
Fixture Measurement Set.

5
Rev. 2 / 3-18-2019
PRF-922B Miniature Two-Point Probe Set
A. Use of Measurement Power Supply
1. The PRF-922B is a high performance micro probed designed for use with a maximum input
voltage of 100 volts. As such, it is capable of delivering an annoying shock to any person touch-
ing the spring-loaded contacts when they are energized.
a. If used with the Prostat PRS-801 Resistance System, the current capability of the micro
probe instrument combinaon is limited to a very low, typically harmless level. However, a
disnct hazard exists in the operator’s reacon to a possible shock.
b. To avoid shock, operang personnel should not touch the electrodes, or any exposed me-
tallic parts of the PRF-922B fixture or cable assembly when power is applied to the probe.
CAUTION
To avoid electrical shock, Do Not Touch the fixture test electrodes, test bed, or exposed
metal BNC connecons when power is being applied to the probe.
c. The designed operang voltage limit for normal auding and laboratory measurements is
100 volts. Exceeding 100 volts greatly increases the risk of personnel shock hazards.
WARNING
Never exceed the maximum applied operang test voltage of 100 volts
d. Only qualified instrument repair and test personnel should exceed the 100-volt opera-
on limit, and then do so only under controlled condiƟons using maximum precauƟons
against personnel shock.
e. Never, under any condions, exceed 500 volts during fixture test or repair.
B. Other Operaonal Precauons
1. Do Not Use the PRF-922B Micro Probe if it fails to funcon during its connuity inspecon test.
2. Do Not Use the PRF-922B Micro Probe if it becomes damaged in any way
3. Only Prostat Corporaon authorized, qualified repair personnel may open PRF-922B or PRV-
913B housing, terminal assemblies, or perform product repair. Unauthorized opening of fixture
or instrument housings, device tampering, or aempted repair will absolutely void product
warranty and completely absolve Prostat Corporaon, its employees, suppliers and representa-
ves of any responsibility, liability, or other, whatsoever.
WARNING
Unauthorized opening of fixture or instrument housings, device tampering, or aempted re-
pair will absolutely void product warranty and completely absolve Prostat Corporaon of any
responsibility, liability, or other, whatsoever.
4. Do Not Touch Electrode Surfaces. Electrodes will become contaminated with skin oils and
salts, and may become damaged or rendered inaccurate.

6Rev. 2 / 3-18-2019
PRF-922B Miniature Two-Point Probe Set
5. Do Not Use Or Store PRF-922B Or PRV-913B In Damp Environments. Always store devices
with protecve caps in place in a dry environment, preferably at ≤20% Relave Humidity.
CAUTION
Storage or use of these instruments, fixtures and devices in damp or wet condions may
cause damage to electrical circuits, and contact surfaces, which may effect performance or
increase the possibility of personnel shock or arc discharge.
6. Do not use these fixtures and devices in combusble or explosive environments.
WARNING
Improper handling and use of energized circuits may cause arc discharge, which in turn may
cause the ignion of combusble materials or fumes. Do not use exposed energized circuits in
flammable areas.
7. Do not aempt to measure energized materials, items or circuits with the PRF-922B
8. The PRF-922B is a precision fixture to be operated by experienced personnel familiar in the use
and handling of devices employing energized power supplies.
9. Do Not Drop or cause mechanical damage to these devices.
III. PRF-922B Micro Probe & PRV-913B Verifier OperaƟons
A. PRF-922B Setup
1. Connect measurement cable to PRF-922B
a. Remove black rubber protecve cover from PRF-922B’s
BNC connecon.
b. Aach shielded cable to the probe’s BNC connecon
(Figure 2).
2. Connect measurement cable to Dual Banana BNC Converter
(Figure 3).
Figure 2: Connect shielded cable
to PRF-922B’s BNC fixture
BNC Connector

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Rev. 2 / 3-18-2019
PRF-922B Miniature Two-Point Probe Set
Figure 3: Connect Cable to Banana Con-
verter
Figure 4: PRF-922B with Cable & Banana
Coverter
3. Once the cable and BNC adapter are installed the PRF-922B is ready for connuity test, verifica-
on and use (Figure 4).
4. To use, connect dual banana converter to wide range, resistance instrument with ¾ inch termi-
nal spacing. Flange side of dual banana should be connected to the Posive (+) power terminal.
NOTE
To remove BNC connecons, apply slight pressure and twist connector counter clockwise
B. Confirming Proper BNC Connecons, Connuity & High Resistance Tests
The following confirms proper connecons by checking connuity of the micro probe against a
metal plate, then confirms its ability to measure high resistance.
1. To confirm general setup and funcon of the PRF-922B, place the electrodes against a clean
metal surface. For example, the plated metal side of the Prostat PTB-920, Dual Surface Test
Bed.
a. Hold the PRF-922B vercally, and apply pressure to slightly compress the electrodes, mak-
ing posive contact with the metal surface.
b. Acvate the wide range, resistance instrument to obtain a measurement.
(1) In the case where the Prostat PRS-801 is the measurement instrument, it should
measure approximately 1.0 ohm, or less.
(2) With other instruments, they should provide a LOW resistance indicaon. For
example, <103ohms when using the ESD Check ESI-870 Resistance Indicator, or <104
ohms when using the PRS-801 Resistance Meter.
2. Repeat the above procedure using the clean insulated surface (Black, labeled side) of the PTB-
920, or an insulated acrylic plate.

8Rev. 2 / 3-18-2019
PRF-922B Miniature Two-Point Probe Set
a. Hold the PRF-922B vercally, and apply pressure to compress the electrodes, making posi-
ve contact with the insulated surface.
b. Acvate the wide range, resistance instrument to obtain a measurement.
(1) In the case where the Prostat PRS-801 is the measurement instrument, it should
measure 1.0x1012 ohms, or greater.
(2) With other instruments, they should provide a HIGH resistance indicaon. For
example, 1012 or >1012 ohms when using the ESD Check ESI-870 Resistance Indicator
(3) or approximately 1011 ohms when using the PRS-801 Resistance Meter
C. PRF-922B Verificaon Using the PRV-913B Two-Point verificaon fixture
1. Connect the BNC/banana adapter to the wide range, resistance measurement instrument.
Flange side of dual banana should be connected to the Posive (+) power terminal. This applies
test voltage to the 10 outer ring electrodes.
2. Remove PRF-922B Probe Cover (Figure 5).
3. Posion PRF-922B vercally into the PRV-913B Two-Point
Verifier with its spring loaded pin electrodes making direct
contact with the Verifier’s gold plated test segments.
4. Depending on your resistance instrument select either 10V
or 100V test voltage.
5. Measure PRF-922B probe resistance while posioned in the
PRV-913B Two-Point Verifier. Resistance should be 1.0x106
ohms ±5%.
D. Basic Measurements Using the PRF-922B Micro Probe
1. Place material to be measured on an insulated test
bed, the clean insulated surface (Black, labeled
side) of the PTB-920, or an insulated acrylic plate.
2. Posion the PRF-922B vercally directly over test
area and lower it unl the spring loaded center
electrode makes direct contact with the material
under test.
3. Apply sufficient pressure on the probe unl the
center and outer spring loaded electrode are
parally compressed while in contact with the test
material.
Figure 5: Remove Probe Cover
Figure 6: Insert PRF-922B Fixture into PRV-
913B Two-Point Verifier and Measure Verifier
Resistance

9
Rev. 2 / 3-18-2019
PRF-922B Miniature Two-Point Probe Set
IMPORTANT NOTE
Adjust probe pressure to insure that the electrode springs are controlling the probe’s con-
necon with the material’s surface and that the springs are not fully compressed against
their stops. This will insure reproducible measurements.
4. Select appropriate instrument test voltage and iniate resistance measurement. ESD Associa-
on S11.11 test voltage guidelines for measuring packaging materials are as follows:
a. For material resistance measurements of less than 1.0x104ohms, use <10 volts.
b. For measurements of 1.0x104to <1.0x106ohms, use 10 volts.
c. For measurements greater than 1.0x106ohms, use 100 volts
NOTE: For opmal performance and accuracy, use the Prostat PRS-801 Resistance System
in its AUTOMATIC Mode (either Default Mode 1 [Ohms], or Mode 2 [Exponenal 1.0EXX/
Ohms] display). AUTOMATIC Mode will control test voltage, resistance range adjustment
and electrificaon period automacally.
Figure 7: Measurement IllustraƟons Using the Prostat PRF-922B Fixture

10 Rev. 2 / 3-18-2019
PRF-922B Miniature Two-Point Probe Set
IV. Using the PRF-922B as a One-Point Probe
A. Define pin connuity as shown in Figure 8. Using a connuity instrument such as a mulmeter,
measure from each fixture pin to the BNC/Banana Adapter installed at the end of the shielded
cable. On the PRF-922B 2-Point fixture this determines the probe pin that is connected to the
shielded cable and BNC/Banana Adapter. It also confirms measurement connuity through the
fixture.
Figure 8: Measure pin conƟnuity to the adapter banana to idenƟfy acƟve measuring pin.
B. If desired, remove the non-conducng pin from the PRF-922B fixture or PRF-922A-B adapter as
shown in Figure 9. This allows precise posioning of the single acve conducng pin.
Figure 9: Removing the inacƟve pin helps idenƟfy point of actual measurement by the acƟve pin.
C. Once pin connuity is determined and connecon confirmed, install a conducve rubber boot on
the acve measurement pin as shown below as shown in Figure 5. The boot reduces contact resis-
tance and enhances measurement repeatability. It is required by ANSI/ESD STM11.13.
V. Material & Device Measurements with Single Pin Probe
The single pin probe configuraon measures effecve resistance across and or through a material or as-
sembly. A proper measurement would include placing the material, or device under test (DUT), onto a
clean metal test bed that is isolated from ground, such as the Prostat PTB-920 Test Bed. This insures that
only the material is being measured and the measurement is not affected by voltage variables on ground.
Note that before the measurement, the metal test bed is temporarily grounded to dissipate exisng

11
Rev. 2 / 3-18-2019
PRF-922B Miniature Two-Point Probe Set
charges on its surface. The Operator should also be properly grounded to avoid body charges influencing
the measurement.
The metal test bed is connected to the resistance instruments posive (+) terminal, which provides volt-
age to the test bed during the measurement. The micro probe shielded cable with installed BNC/Banana
Adapter is connected to the resistance instruments negave (-) terminal. The negave terminal provides
the current from the DUT to the instrument circuit, which calculates and displays the resistance of the
material or DUT. Proper measurement setup is shown below in Figure 10.
Figure 10: Measurement setup for probe measurement of a material or device as described in ANSI/ESD
STM11.13
Figure 7 shows the classic setup for measurement of a material’s resistance in accordance with ANSI/
ESD STM11.12 Volume Resistance. It also provides an indicaon of the material’s probable resistance to
ground (Rtg) when in use and while in contact with a grounded conducve surface. Note that this mea-
surement is not an actual Rtg measurement. It is simply an indicaon that the material or DUT may be
Groundable, depending on its measured resistance characteriscs.
VI. Resistance to Ground (Rtg) Measurements
Rtg measurements are made on installed materials, or assemblies while used in the manufacturing pro-
cess. ESD control materials and tools are intended to funcon while properly grounded. Rtg measurement
confirms the material is (a) actually grounded, and (b) the total resistance of the material when grounded
is within the ESD program requirements. There are many process elements that must be confirmed as
grounded and within program requirements using Rtg. Examples of are:
• Floors, worksurfaces, chairs, carts
• Device trays when loaded into equipment
• Crical equipment parts, tools, assembly fixtures
• …and many others
Rtg measurements are made with the posive (+) instrument lead connected directly to the facility’s
equipment ground system (or auxiliary ground, if used), and the test probe connected to the instruments
negave (-) terminal as previously described above. During the measurement, test voltage is applied to
the ground system and current is measured on the installed material or device under test by the single
point probe.
Oen, Rtg measurement is described as a “system measurement” that includes addional materials,
objects, devices and connecons in series with the device under test and ground. Examples of Rtg system
measurements are described below.

12 Rev. 2 / 3-18-2019
PRF-922B Miniature Two-Point Probe Set
Device Tray in Feeder Equipment: This measurement confirms connuity from the tray to ground
through several elements
• Paint on tray contact surface
• Support shelf
• Shelf support and control linkage
• Shelf linkage to machine frame support
• Machine frame to ground
Device Transport Cart: This Rtg measurement combines equipment components with the environ-
ments floor surface, including:
• Cart shelf surface
• Cart frame
• Cart wheels
• Floor surface to ground
Assembly Fixture at Workstaon: Rtg measurement from the fixture may include several elements,
depending on how it is installed, such as:
• The fixture’s device holding assembly
• Fixture frame
• Workstaon surface supporng the fixture
• Workstaon surface to the workstaon’s frame
• Workstaon frame to ground
The photo in Figure 8 is an Rtg measurement of a tray on a worksurface mat. In this configuraon the
resistance measurement includes the tray, the mat, the mat connecons and wiring to ground. Noce that
the posive test lead is separately connected to ground.
VII.Handling & Maintenance
A. PRF-922B Miniature Two-Point Probe Fixture
1. Store the PRF-922B in a clean, dry environment with both BNC and Probe covers installed for
environmental and mechanical protecon.
2. Periodically, remove all spring-loaded test pins. Clean the spring-loaded test probes and Teflon
mounng disk with a soluon of laboratory grade isopropyl alcohol and a lint-less cloth, or
laboratory quality swab. Allow components to dry thoroughly be fore re-assembling.
a. Remove each test probe individually by grasping it firmly then
pulling it straight out of its socket.
b. Inspect each probe for damage, then clean with the
alcohol soluon. If a probe is damaged, i.e., bent, does not
compress smoothly, or has deep surface scratches, replace it
with a new probe of the same size and characteriscs.
(Contact Prostat Corporaon, Customer Service for spare
replacement probes.)
c. Clean and dry the Teflon mounng disk twice to insure
cleanliness
d. Carefully re-install the spring-loaded test probes, and fully
re-seat them in their sockets
Figure 11: Remove Spring-Loaded
probe electrode by grasping firmly
and pulling straight out of its
socket.
Pull straight out

13
Rev. 2 / 3-18-2019
PRF-922B Miniature Two-Point Probe Set
3. Aer cleaning, perform Connuity, High Resistance and Veri
fier checks.
B. Use of Conducve Rubber Electrode “Boots” to Reduce Contact Resistance
1. Measurements obtained without use of conducve rubber
boots will simulate material contact by metal objects. In this
situaon, contact resistance is high and the resulng measure-
ments will be higher than those obtained using conducve
rubber boots. (Figure 9)
2. Conducve rubber boots are used to reduce contact resistance
between the electrodes and material under test. Measure-
ments made with boots installed are typically lower than those
obtained without boots.
C. PRV-913B Two-Point Dual Verificaon Fixture
1. Store the PRV-913B in a clean, dry environment.
2. Periodically, clean and dry the gold fixture contact segments twice with a soluon of laboratory
grade isopropyl alcohol and laboratory quality swab.
V. Warranty InformaƟon
A. Prostat Warranty
Prostat Corporaon expressly warrants that for a period of one (1) year from the date of purchase, that
Prostat instruments will be free from defects in material (parts) and workmanship (labor). If Prostat
receives noce of such defect during the warranty period, Prostat will replace at its expense such parts
that it determines to be defecve. Any defecve part must be returned to PROSTAT postage prepaid
with proof of purchase date.
Warranty Exclusions – THE FOREGOING EXPRESS WARRANTY IS MADE IN LIEU OF ALL OTHER PRODUCT
WARRANTIES, EXPRESS AND IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE WHICH ARE SPECIFICALLY DISCLAIMED. The express warranty will not apply to defects or
damage due to accidents, neglect, misuse, alteraons, operator error, or failure to properly maintain,
clean, or repair products. Limit of Liability – in no event will PROSTAT or any seller be responsible or
liable for special, incidental, or consequenal losses or damages, under any legal theory including but
not limited to contract, negligence, or strict liability.
Fulfillment by Prostat of its express warranty obligaons described above will be purchaser’s
exclusive remedy and will be Prostat’s and seller’s limit of liability for any breach of warranty or
otherwise.
B. Shipping of Warranty Returns
1. Obtain a Return Materials Authorizaon (RMA) number and shipping address from Prostat custom-
er service. Pack the instrument carefully and ship it prepaid and insured to the proper desnaon
provided by Prostat’s customer service department.
2. For detailed shipping instrucons and Return Materials Authorizaon (RMA), contact Prostat.
Figure 9: Installing ConducƟve
Rubber Electrode “Boots”

14 Rev. 2 / 3-18-2019
PRF-922B Miniature Two-Point Probe Set
C. Shipping Non-Warranty Items
1. Any Prostat product returned for non-warranty repair or calibraon requires a Return Materials
Authorizaon (RMA) number and should be packaged and shipped as described above, and as di-
rected by Prostat’s customer service department.
2. The following informaon must be included with the returned product:
a. Descripon of the problem
b. Customer’s Purchase Order Number & Prostat’s Materials Authorizaon (RMA) number
c. Name, telephone number and fax number of individual contact who can provide more informa-
on regarding the problem and related applicaon(s).
d. Complete return address.

15
Rev. 2 / 3-18-2019
PRF-922B Miniature Two-Point Probe Set
PRF-922B & PRV-913B Miniature Concentric Ring Fixture Set SpecificaƟons
PRF-922B Miniature Two-Point
Physical Dimensions: Length: 5.9 inches (150mm) without probe cover. 6.5 inches (165mm) with probe
cover. Probe diameter 0.5 inches (12.7mm). Probe cover outer diameter 0.63
inches (16mm).
Probe Weight: 1.5 ounces (43 grams)
Finish: Black anodized
Dielectric Material: Teflon
Contact Dimensions: Inner (Center) Contact Probe: 0.1 inches (2.54mm)
Minimum Sample 0.32 inches (8.2mm) diameter
Size:
Probe Spring 3.5 pounds (1.6 kg)
Force/Test:
Probe Total Travel: 0.3 inches (7.8mm)
Connecon: BNC with outer source and inner sense connecons
Cable: RG-174 coaxial cable equipped with insulated BNC couplers, and BNC/Banana
adapter for connecon to Prostat PRS-801 Resistance System.
Power: Not applicable. Fixture powered by resistance instrument.
Warranty: Prostat Corporaon, Limited one year
PRV-913B Dual Verificaon Fixture
Physical Dimensions: 2.0 in x 2.0 in x 0.83 in (50.1mm x 50.1mm x 21mm)
Fixture Weight: 5.29 ounces (150 grams)
Finish: Black anodized
Contact Pads: Copper substrate with nickel and hard gold plang
Resistors: ±2% precision, 10-megohm resistors, total of 10 (Concentric Ring Side)
±2% precision, 1 each 10-megohm resistor (2-Point Side)
Power: Not applicable. Powered by PRF-912B during test
Warranty: Prostat Corporaon, Limited one year

16 Rev. 2 / 3-18-2019
PRF-922B Miniature Two-Point Probe Set
NOTES

17
Rev. 2 / 3-18-2019
PRF-922B Miniature Two-Point Probe Set
NOTES

18 Rev. 2 / 3-18-2019
PRF-922B Miniature Two-Point Probe Set
NOTES

PROFESSIONAL STATIC CONTROL PRODUCTS
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Prostat Corporaon
Specificaons are subject to change without noce.
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