PRS-812
RESISTANCE METER
User Manual
Page
I. Introducon & Descripon 4
II. Cauons & Warnings 7
III. Controls, Connecons & Indicators 9
IV. Baery Installaon and Replacement 15
V. Setup & Calibraon 16
VI. Instrument Operaon 18
VII. Instrument Maintenance 31
VIII. Warranty Informaon 32
General Specicaons 34
Instrument Controls 35
Copyright © 2012 by Prostat® Corporaon. 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 wrien permission. For informaon contact
Prostat Corporaon, 1072 Tower Lane, Bensenville, IL 60106 USA
Prostat is the registered trademark of Prostat® Corporaon
4Rev. C / January 2012
PRS-812 Resistance Meter
The PRS-812 Resistance Meter makes precision resistance measurements from
0.1 up to 1.0x1012 ohms with an overall measurement tolerance of ±5%. It is
capable of measuring up to 2.0x1014 ohms with tolerance depending on proce-
dures and condions. The PRS-812’s wide range and close tolerance make it the
ideal ESD Auding instrument for measuring resistance to a variety of ESD and
general industry specicaons. It is operated by programmed microprocessors
that control the instrument’s measurement process, resistance auto ranging,
test voltage selecon, electricaon periods, and display funcons. It can be
operated in either fully automac or manual modes, or a combinaon of
automac and manual modes.
The PRS-812 is unique in that it records and stores up to 80 resistance measure-
ments in its own non-volale memory register. Stored data is summarized with
a push of a buon.
Its accuracy is based on its ability to rapidly make several measurements each
second, and average them unl a stable set of eight measurements, all within
5% tolerance, are obtained. The nal averaged data is displayed as the resis-
tance measurement. Typically, measurements at less than 1 ohm are within
5% of tolerance, and those between 1.0 and 1.0x1012 ohms are within 0.5% of
laboratory references
While quite sophiscated in design, the PRS-812 Resistance Meter is easy to use and extremely helpful in
making accurate ESD auding measurements, or general resistance and connuity checks.
To avoid electrical shock or damage to the PRS-812 Resistance Meter, read
this manual completely before installing baeries or using the instrument.
A. Measurement Applicaons
The PRS-812 Resistance Meter is designed to measure resistance characteriscs of electrostac
discharge (ESD) control materials and products to current ESD industry standards, including:
Wrist Straps (ANSI/ESD S1.1)
Flooring (ANSI/ESD STM7.1)
ESD CP Grounds (ANSI/ESD S6.1)
Footwear (ANSI/ESD STM9.1)
Equipment (ESD SP10.1)
Material Handling Containers
Garments (ESD STM2.1)
Worksurfaces (ANSI/ESD S4.1)
Carts & Seang (ANSI/ESD STM 12.1)
Workstaons
Producon Aids & Hand Tools
Packaging (ANSI/ESD STM11.11, ANSI/ESD
STM11.12 & ASTM 257), and Other ANSI/
S20.20 ESD Program Control Elements
Addional xtures and electrodes supplied separately are required for many of these mea-
surement.
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Rev. C / January 2012
PRS-812 Resistance Meter
B. PRS-812 Resistance Meter Components:
The PRS-812 Resistance Meter includes the following items:
1. PRS-812 Resistance Meter Instrument with 2 each 9V alkaline baeries.
Only use alkaline baeries for opmal performance.
2. Two 10-foot leads (PRS-800LB & PRS-800LR) for general audit measurements up to 1.0x1012
ohms.
3. One heavy duty, black “Bulldog” clip (PRS-801BC)
4. Two Metal Alligator Clips (PSI-870MAC)
5. One Audit Test Bed (PTB-915)
6. One calibraon shunt for low range adjustment (PRS-801CC)
Oponal accessories are available for the PRS-812 Resistance Meter. Visit www.prostatcorp.com
for addional informaon.
C. PRS-812 Basic Descripon & Funcons
The PRS-812 Resistance Meter has several test, display and data logging funcons:
1. The PRS-812 six basic measurement modes are described in the following table
6Rev. C / January 2012
PRS-812 Resistance Meter
-
AUTOMATIC 1
[Default]
1.0EXX
IND Ω - TΩ AUTO AUTO. AUTO. AUTOMATIC RESISTANCE RANGE,
TEST VOLTS, ELECTRIFICATION,
DISPLAY HOLD
AUTOMATIC 2 OHMS
Ω - TΩ AUTO AUTO. AUTO.
MANUAL 1 1.0EXX
IND Ω - TΩ MANUAL MAN
MAN. or
AUTO TEST ONLY; NO DISPLAY HOLD
UL= UNDER DECADE LEVEL
OL= OVER DECADE LEVEL
MANUAL 2 OHMS
Ω - TΩ MANUAL MAN
MAN. or
AUTO
MANUAL/
AUTOMATIC 1
1.0EXX
IND Ω - TΩ
AUTO &
MANUAL
MAN. Start
AUTO
Run
AUTO.
MANUAL SETUP STARTING
DECADE, AUTO ADJUST RANGE,
TEST VOLTS, ELECTRIFICATION
DISPLAY HOLD
MANUAL/
AUTOMATIC 2
OHMS
Ω - TΩ
AUTO &
MANUAL
MAN. Start
AUTO
Run
AUTO.
#1 AUTOMATIC: RESISTANCE RANGES IN AUTO 0.1Ω TO <2.0E+12Ω as follows
@<10V: 0.1 TO <1.0E+04Ω (0.1Ω - < 10KΩ)
@ 10V: 1.0E+04 TO <1.0E+06Ω (10KΩ - < 1MΩ)
@100V: 1.0E+06 TO <2.0E+12Ω (1MΩ - <200TΩ)
#2 MANUAL: RESISTANCE RANGES IN MAN 0.1Ω TO <2.0E+12Ω as follows
@<10V: 0.1 TO <1.0E+05Ω (0.1Ω - <100KΩ)
@ 10V: 1.0E+03 TO <1.0E+09Ω (1KΩ - <1GΩ)
@100V: 2.0E+05 TO <2.0E+12Ω (200KΩ - < 200TΩ)
#3 AUTO-MANUAL: (Same as AUTOMATIC)
RESISTANCE RANGES IN AUTO-MANUAL 0.1Ω TO <2.0E+12Ω as follows
@<10V: 0.1 TO <1.0E+04Ω (0.1Ω - < 10KΩ)
@ 10V: 1.0E+04 TO <1.0E+06Ω (10KΩ - < 1MΩ)
@100V: 1.0E+06 TO <2.0E+12Ω (1MΩ - <200TΩ)
2. The PRS-812 provides three separate test voltages for resistance measurements as indicated in
the table, above:
<10 Volts
10 Volts
100 Volts
In and modes the instrument automacally controls volt-
age and resistance range based on resistance characteriscs of materials being measured. In
the mode the operator may select test voltage and and resistance range. Note that
the most ecient mode of operaon in for maximum baery life.
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PRS-812 Resistance Meter
3. The PRS-812 displays resistance Measurements in several ways:
a. 14 factory programmable LED’s each represenng one order of magnitude from <103 to
>1012 ohms. LED’s have three colors, including:
The PRS-812 provides very accurate measurements up to 1.0x1012 ohms, and
has the capability to display values up to 2.0x1014 ohms. However, the user
should be aware that accuracy degrades rapidly above 1.0x1012 ohms.
b. The large Liquid Crystal Display (LCD) includes an analog (1 - 10) scale and X1, X10 and X100
mulplier indicaon for measurement in Ω, KΩ, MΩ, GΩ and TΩ.
c. Digital measurements are provided using integers and Ω, KΩ, MΩ, GΩ, TΩ indicators, or in
exponenal format (1.0EXX) with Ω -TΩ indicators.
4. The PRS-812 includes data logging (storage) capabilies for up to 80 data points when
is selected. The instrument will provide access to the memory register, calculate and display
Minimum, Maximum and Average of all measurements in the instrument’s memory whenever
is selected.
As with any electrical device, use proper safety precauons and safe measurement procedures to
avoid personnel shock and arc discharge.
A. The PRS-812 Resistance Meter is baery operated and delivers test voltages up to 100 volts.
Only use alkaline baeries in the PRS-812.
B. The instrument is current limited for safety, however, if improperly used it may be capable of deliv-
ering an annoying shock to a person touching conductors energized by the PRS-812, parcularly at
100 volts.
C. While current limited, a hazard exists in personnel reacon to a potenal shock.
D. To avoid personnel shock, follow the General Operaons instrucons at all mes. Do not touch
energized electrodes or xtures when power is applied except as specically described in this and
accessory instrucons.
E. Do not operate or store the instrument in damp environments or wet condions.
8Rev. C / January 2012
PRS-812 Resistance Meter
Storage or use of this instrument in high humidity, damp or wet condions
may cause damage to the instrument’s electronic circuits, eect performance
and can increase the possibility of personnel shock or arc discharge.
F. Do not use the PRS-812 in combusble or explosive environments
Improper handling and use of energized circuits may cause arc discharge,
which in turn may cause the ignion of combusble materials or fumes.
Do not use exposed energized circuits in ammable areas.
G. Do not aempt to measure energized circuits with the PRS-812
H. Do not use the PRS-812 if it becomes damaged in any way
I. Only Prostat trained instrument personnel should aempt to service or repair the PRS-812
J. Other Safety & Operang Consideraons
1. This manual displays cauons and warnings alerng the user to hazardous operaon and ser-
vicing condions. or headings throughout this publicaon ag this infor-
maon, where appropriate. Follow all cauon and warning instrucons at all mes.
2. The PRS-812 is a precision instrument and should be operated by experienced personnel famil-
iar with the use and handling of devices containing power supplies.
The PRS-812 Contains Electrostac Discharge Sensive (ESDS) components
and includes precision alignment of circuit elements. Only Prostat trained and
ESD Qualied instrument repair personnel should perform service.
3. The PRS-812 contains Electrostac Discharge Sensive (ESDS) components. Qualied personnel
should service it only at ESD Controlled workstaons. Do not aempt to dismantle the PRS-812
9
Rev. C / January 2012
PRS-812 Resistance Meter
without Prostat’s authorizaon and expert supervision. The instrument contains exceponally
clean circuits that are aligned and adjusted in a precise manner for opmal operaon and ac-
curate performance. Unauthorized opening of the PRS-812 housing will void the instrument’s
warranty.
Unauthorized opening of the PRS-801 case or dismantling in any manner
WILL VOID THE INSTRUMENT’S WARRANTY.
4. Read this manual in its enrety before installing baeries or using the PRS-812.
5. Do not drop or cause unnecessary mechanical shock to your PRS-812 instrument.
6. Store the instrument in a clean, dry environment. Do not expose the instrument to wet, ex-
tremely hot or cold condions.
7. If the unit is stored in a cold environment, allow it to stabilize at room temperature before
powering up the unit. This will prevent damage due to condensaon that may accumulate on
the instrument’s circuit boards.
Before operang the PRS-812 instrument become familiar with each control and display funcon. A
thorough understanding of the instrument’s operaon will make its use a pleasant experience, en-
hance measurement accuracy, avoid mistakes and prolong the life of the instrument.
Toggles Through Six Operaon Modes
(1) AUTO: (AUTOMATIC) displays data in exponenal format 1.0EXX
AUTO in exponenal format, e.g., 1.3E05, is the Default start up
mode when the instrument is turned ON.
(2) AUTO: (AUTOMATIC) displays data in Ω, KΩ, MΩ, GΩ and TΩ. The instru
ment controls resistance ranges, test voltage and electricaon periods in
AUTOMATIC mode.
10 Rev. C / January 2012
PRS-812 Resistance Meter
(3) MANUAL: displays data in exponenal format 1.0EXX
(4) MANUAL: displays data in Ω, KΩ, MΩ, GΩ and TΩ
In , the operator selects resistance range in single decade
increments. Test voltage may be selected by the operator, or allowed
to funcon automacally based on resistance range selected. The
operator determines electricaon period in seconds (SEC) using the
displayed mer in the center of the LCD.
(5) AUTO-MANUAL: displays data in exponenal format 1.0EXX
(6) AUTO-MANUAL: displays data in Ω, KΩ, MΩ, GΩ and TΩ
In the operator may select the inial resistance range in
decade increments. Once set, the PRS-812 starts the measurement process
from the preset resistance decade, rather than re-zeroing itself for each
measurement. This feature saves measurement cycle me and extends
baery life. In this mode the instrument automacally controls test voltage,
range and measurement electricaon period.
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Rev. C / January 2012
PRS-812 Resistance Meter
Two Triangular Arrows Buons, UP () and DOWN (), select Resistance
Measurement Range in single orders of magnitude while in MANUAL or
modes
Manual Selecon of <10, 10 or 100 volts in selects inial test
voltage. Test Voltage & Resistance Limits are as follows:
0.1 to <1.0E+05Ω (0.1Ω - <100KΩ)
1.0E+03 to <1.0E+09Ω (1KΩ - <1GΩ)
2.0E+05 to <2.0E+14Ω (200KΩ - <200TΩ)
Opmal minium measurement in using 100
volts is 2.0E+05.
If is not displayed in the lower le corner of the LCD, pressing
once turns Memory Register ON [ will then be displayed in
LCD]. If is ON and measurement data is stored in memory, pressing
once will provide access to the memory register. Pressing
successively will calculate and sequenally display
Minimum [], Maximum [] and Average [] of data stored in the
Memory Register. If memory is and register contains stored data pressing
will provide the following informaon:
Provides access to data in Memory
XX Flashes in LCD indicang number of data points in the
register and the last measurement is displayed. Pressing DOWN and UP
displays other data points and their respecve posion in the register is
shown in the XX secon of the LCD.
Displays MIN Data Point in Memory
Displays MAX Data Point in Memory
When displayed, [Over Level] indicates a measurement greater
than (>) 2.0x1014 ohms, which is beyond the measurement capability of the
PRS-812.
Displays of all Memory Data Points
[Over Level] measurements [>2.0x1014 ohms] are not included in
displayed average () calculaon.
Returns System to normal operaons
If in mode, pressing will return the instrument to normal
measurement operaons.
12 Rev. C / January 2012
PRS-812 Resistance Meter
If is not pressed, a h me OOPS will be displayed in the
LCD when is next pressed. To Clear OOPS, press . The instrument will
return to normal operaons.
In normal operaons erases data in Memory Register, discards most
recent measurement, or turns the funcon OFF as follows:
a. When in any operaon mode, and is not displayed, pressing
will erase all data stored in Memory.
The process of turning the funcon OFF will clear the Memory
Register of all stored data. Be sure that this is indeed desirable before
pressing the buon.
b. If a measurement is displayed in , prior to pressing buton
pushing will discard that held value and will not enter it into
Memory. Other data in Memory Register remains intact.
c. If reviewing data in the Memory Register while in the mode,
pressing will discard the displayed data point. Other data in
Memory Register remains intact and indexes down one space to replace
the discarded data point.
d. When in any operaon mode, and is not displayed, pressing
will erase all data stored in the Memory Register. Pressing OFF
will disble the mode and the instrument will be de-energized. When
powered up again the mode will remain disabled unl -
is pressed once.
Turns instrument for normal operaons, performs funconal & Baery
tests, turns instrument OFF.
Displays on LCD if baery provides acceptable voltage for accurate
measurements, or displays if unacceptable and baeries require replace
ment.
Saves measurement and prepares instrument for next test cycle, i.e., enters
measurement into Memory Register if is , and clears and the
LCD display between measurements.
Begins measurement sequence in accordance with selected mode
Baery buss cut-o switch is used to isolate the main baeries from the
instrument’s circuit during baery change, instrument storage and
transport.
13
Rev. C / January 2012
PRS-812 Resistance Meter
Switch baery buss to the OFF posion before changing baeries to avoid re-
verse polarity damage to the instrument.
14 LED’s across the top of the PRS-812 indicate measurement order of mag-
nitude in decades from <103 to >1012 ohms.
The PRS-812 provides very accurate measurements up to 1.0x1012 ohms, and
has the capability to “indicate” values up to 2.0x1014 ohms. However, the user
should be aware that accuracy degrades rapidly above 1.0x1012 ohms.
When ON Indicates instrument in mode
When ON indicates instrument in mode
When and are , indicates instrument is in
mode.
The one decade analog scale elements darken to indicate measurement in
teger. X1, X10 or X100 darken to indicate the scale mulplier. Combine the
Analog indicators with Ω, KΩ, MΩ, GΩ and TΩ symbols to obtain an analog
measurement.
Provides the number of data points stored in the Memory Register when
is and instrument is in preparaon for a new measurement.
The Memory Register can store up to 80 data points.
Also idenes a displayed data point’s posion in the Memory Register
when in the mode.
Display’s electricaon period required for the measurement when in
during and measurement modes. In ,
provides connuous measurement ming up to 99 seconds, then restarts at
0 seconds.
14 Rev. C / January 2012
PRS-812 Resistance Meter
Displayed when buon is pushed second me while in mode.
Number displayed when is indicated is the Minimum data value in
Memory Register.
Displayed when buon is pushed a third me (sequenally) in
mode. Number displayed when is indicated is the Maximum data value
in Memory Register.
Displayed when buon is pushed the fourth me (sequenally) in
mode. Number displayed when is indicated is the Average of all
data values in Memory Register that are less than 2.0x1014 ohms. (OL’s are
not included in averaging calculaon.)
Either the buon must be depressed a h me or
pressed to return the system to its operaonal, measurement mode.
Indicates that the Memory Register is and is Recording data each me
the buon is depressed aer a measurement.
Ohms: Indicates measurement between 0.1 and 999 ohms
Indicates measurements from 1,000 (1.0x103) to 990,000 (9.9x105) ohms
Indicates measurements from 1,000,000 (1.0x106) to 999,000,000 (9.9x108)
ohms
Indicates measurements from 1,000,000,000 (1.0x109) to 999,000,000,000
(9.9x1010) ohms
Indicates measurements from 1,000,000,000,000 (1.0x1012) to
200,000,000,000,000 (2.0x1014) ohms
Indicates <10, 10 or 100 volts being applied as the test voltage.
Indicates measurement is complete at the end of a cycle. Holds data
point in display unl instrument is or is depressed.
Baery indicaon for low voltage
Power terminal for supplying Test Voltage to xture or material under test.
Sensing Terminal for measurement of current (I) through xture or material
under test.
15
Rev. C / January 2012
PRS-812 Resistance Meter
Located in lower secon of case, opposite LCD display. Holds two 9V-transistor baeries. Two
screws secure the baery cover. Note: Use only Long Life Alkaline Baeries. Remove baeries
when instrument is not in use for long periods of me.
For opmal baery life and avoid instrument damage, always replace the baeries with high energy,
alkaline baeries. Failure to do so will result in a diminished baery life, measurement error and potenal
instrument damage that could void the warranty.
The baery caps on the instruments you have purchased are designed to t snugly. Please follow the di-
recons below for safe replacement of baeries.
A. Slide baery bus switch to the OFF posion (see gure 3).
B. Carefully remove the baery cover from the instrument.
C. Gently take the baeries from the baery compartment.
D. Unwind any baery lead that is wrapped around the top of the baery terminal. Do not pull bat-
tery connecon leads - this could cause instrument damage.
E. Very carefully place a at head screwdriver between the baery terminals and gently li the bat-
tery cover from the baery.
Baery Buss Switch
MUST be o during
baery change.
16 Rev. C / January 2012
PRS-812 Resistance Meter
F. Properly dispose of any old baeries.
G. Posion the new alkaline baery under the baery cover.
H. With your thumb, press the terminals in place one at a me.
I. Carefully wind any excess baery lead around the baery terminal below the cap. To avoid instru-
ment damagae, do not pull baery connecon leads
J. Place the baeries back into posion with the baery terminal covers facing the lead spurce
within the baery case shown in gure 4.
K. Carefully posion the instrument baery cover back into place without force.
L. Replace the baery cover screws.
M. Slide baery buss switch to the posion.
Following the above direcons for baery replacement will insure that you do not damage the baery
covers or wires during this process.
It is recommended to measure the voltage of each baery with a mulmeter. If the voltage of
one baery measures at or below 6.75 volts, replace that baery. If both baeries measure at
or below 6.75 volts, replace both baeries.
A. Seng up the PRS-812 for low resistance range calibraon
1. Posion Baery Buss Cut O switch to OFF posion
2. To install baeries, remove two Phillips locking screws and cover. Aach two Long-Life, Alkaline
9V baeries to the baery connecon terminals.
3. Posion baeries in compartment with power leads neatly posioned above baery connec-
ons. Carefully re-install baery cover and locking screws.
Do Not change baeries with the baery buss . Always switch Baery Buss Cut O to OFF
when changing baeries. Should the buon be depressed during baery change and
Baery Bus is the instrument may lock up and not funcon properly or be seriously dam-
aged. In this case, simply disconnect the baeries, then re-install with Baery Buss switch in
the OFF posion.
B. Low Resistance Range (<10 Ohms) Calibraon
1. Install the calibraon shunt (PRS-801CC) across the Negave (-) and Posive (+) Lead Terminals
(Figure 5, below).
17
Rev. C / January 2012
PRS-812 Resistance Meter
2. Press the Red power buon. The instrument display should become energized, each
LED will be tested in sequence, and will is displayed in the LCD if the baeries have
sucient test capacity (gure 9).
3. Allow the instrument circuits to warm-up for a few minutes; approximately 2 - 3 minutes are
sucient, prior to compleng the calibraon sequence.
4. Press once to shi display to ohms mode (Ω).
5. Press the Yellow , then the Gray buon within ½ second. The message will be
displayed in the LCD. (See Figure 8)
6. Press the Yellow RESET buon to complete low range (0.1 to 10 ohm) calibraon. The mes-
sage will automacally be cleared when is pressed. (See Figure 8)
7. Press the Green buon. Indicated resistance should be 1.02 (±0.02) ohms as shown in
Figure 8. Press to clear the display. NOTE: If 1.02 (±0.02) ohms is not displayed, repeat
the calibraon process.
18 Rev. C / January 2012
PRS-812 Resistance Meter
8. Remove the calibraon shunt assembly from the lead terminals
9. The PRS-812 is now ready for wide range measurements from 0.1 to 1.0E+12 Ohms
±
A. Overview of PRS-812 Operaon & Measurement Test Cycle Sequence
The following 10 points provide a general overview for calibrang and using the PRS-812 for resis-
tance measurements.
1. Slide Baery Buss Cut O switch to
2. Press Red buon once to power up PRS-812
a. Instrument performs circuit check, and tests LED’s, LCD display, and baery voltage.
b. LCD displays if baery voltage suitable for instrument operaon; displays if bat-
teries require replacement
c. Instrument ends startup sequence in default , Exponent Display Mode 1.0EXX
3. Select Funcon Mode if other than , Exponent Display Mode 1.0EXX is desired by press-
ing buon
4. Perform low resistance range calibraon aer 3 minute instrument warm-up, if desired
a. Install Calibraon Shunt between posive (+) and negave (-) terminals
b. Press then within ½ second
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Rev. C / January 2012
PRS-812 Resistance Meter
c. is displayed in LCD
d. Press to calibrate instrument to shunt reference
e. Press to measure shunt resistance of 1.02 ±0.02 ohms (Ω)
f. Press buon to prepare instrument for the next measurement
g. Repeat calibraon procedure if necessary
h. Remove Calibraon Shunt
5. Carefully connect test leads to posive (+) [Power] and negave (-) [Sensing] terminals. Insert
right angle sleeved banana into instrument terminal, press gently while twisng into posion.
Standard 10-foot test leads are used for general audit measurements, and provides excellent
accuracy up to 1.0x1012 ohms
6. Connect test leads to electrodes, xture or circuit to be measured
7. Press Green buon to iniate Automac measurement Test Cycle
a. The resistance range is reset to minimum (0.1Ω). It is automacally adjusted in conjuncon
with the resistance characteriscs of the materials under test, based on:
(1) Test voltage; and,
(2) Current ow.
b. Test Voltage is reset to <10V and automacally increased in accordance with the following
material resistance characteriscs:
(1) <10 Volts: 0.1 to less than 1.0x104 ohms (0.1Ω - <10KΩ)
(2) 10 Volts: 1.0x104 to less than 1.0x106 ohms (10KΩ - < 1MΩ)
(3) 100 Volts: 1.0x106 to 2.0x1014 ohms (1MΩ - 200TΩ)
(4) When is displayed, it mean that the resistance is greater than 2.0x1014 ohms
c. Electricaon period, i.e., the me period during which test voltage is applied to the ma-
terial under test, is automacally adjusted to the PRS-812’s measurement characteriscs
and industry standards (ANSI/ESD STM11.11). Typical electricaon periods are:
(1) 2 to 3 Seconds: 0.1 to less than 1.0x104 ohms (0.1Ω - <10KΩ)
(2) 2 to 4 Seconds: 1.0x104 to less than 1.0x106 ohms (10KΩ- < 1MΩ)
(3) 7 to 8 Seconds: 1.0x106 to >1.0x1012 ohms (1MΩ->1TΩ)
(4) 15+ Seconds: 1.0x1012 to 2.0x1014 ohms (1TΩ - 200TΩ)
20 Rev. C / January 2012
PRS-812 Resistance Meter
8. When the PRS-812 displays and holds the nal resistance measurement, is indicated in
the lower, right corner of the LCD.
The PRS-812 is processor controlled to obtain hundreds of measurements per second, and
to make rapid adjustments in resistance range and test voltage as necessary. It will display
the resistance measurement of the material under test based on the following criteria:
a. A digital numeric display is the averaged result of eight (8) individual, consecuve
measurements, each within ±5% of each other.
b. The display is connuously recalculated and updated during the measurement’s elec-
tricaon period.
c. The nal displayed measurement is the averaged result of the last eight (8) individual,
consecuve measurements, each within ±5%, at the end of the electricaon period.
d. If the material or test condions vary such that eight consecuve measurements, each
within ±5% of each other cannot be obtained, the PRS-812 will extend the electrica-
on period unl the measurement criteria are met; or,
e. The electricaon period will automacally be terminated and the most recent aver-
aged result of eight (8) individual, consecuve measurements will be displayed and
held. NOTE: Several material measurements that vary greater than 15 to 20 percent of
each other typically indicate inconsistencies in the material or test condions.
f. In rare cases, when a stable measurement cannot be obtained the display will reset.
NOTE: When several “held” measurements vary greater than 15 to 20 percent of each
other this typically indicates inconsistencies in the material or test condions.
9. To save the displayed measurement in the Memory Register and prepare the PRS-812 for the
next measurement, press the Yellow buon. Pressing causes three funcons:
a. Enters (saves) last measurement into Memory Register
must be displayed in the lower, le corner of the LCD in order to enter the
measurement in the Memory Register. If is not displayed, press
once, then press to save the data.
b. Increases LCD displayed number of data points in the Memory Register () by one, e.g.,
MEM 02
c. Returns the PRS-812 to its last funcon mode in preparaon for the next measurement
10. To make several measurements, simply press to obtain the next measurement, and then
to save it. Repeat the and process for each measurement.
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