Prostat PRS-812 User manual

Category
Measuring, testing & control
Type
User manual

This manual is also suitable for

PRS-812
RESISTANCE METER
User Manual

  Page
I. Introducon & Descripon 4
II. Cauons & Warnings 7
III. Controls, Connecons & Indicators 9
IV. Baery Installaon and Replacement 15
V. Setup & Calibraon 16
VI. Instrument Operaon 18
VII. Instrument Maintenance 31
VIII. Warranty Informaon 32
General Specicaons 34
Instrument Controls 35

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. 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 condions. The PRS-812’s wide range and close tolerance make it the
ideal ESD Auding instrument for measuring resistance to a variety of ESD and
general industry specicaons. It is operated by programmed microprocessors
that control the instruments measurement process, resistance auto ranging,
test voltage selecon, electricaon periods, and display funcons. It can be
operated in either fully automac or manual modes, or a combinaon of
automac and manual modes.
The PRS-812 is unique in that it records and stores up to 80 resistance measure-
ments in its own non-volale memory register. Stored data is summarized with
a push of a buon.
Its accuracy is based on its ability to rapidly make several measurements each
second, and average them unl 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 sophiscated in design, the PRS-812 Resistance Meter is easy to use and extremely helpful in
making accurate ESD auding measurements, or general resistance and connuity checks.

To avoid electrical shock or damage to the PRS-812 Resistance Meter, read
this manual completely before installing baeries or using the instrument.
A. Measurement Applicaons
The PRS-812 Resistance Meter is designed to measure resistance characteriscs of electrostac
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 & Seang (ANSI/ESD STM 12.1)
Workstaons
Producon Aids & Hand Tools
Packaging (ANSI/ESD STM11.11, ANSI/ESD
STM11.12 & ASTM 257), and Other ANSI/
S20.20 ESD Program Control Elements
Addional xtures and electrodes supplied separately are required for many of these mea-
surement.


5
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 baeries.

Only use alkaline baeries for opmal 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 calibraon shunt for low range adjustment (PRS-801CC)
Oponal accessories are available for the PRS-812 Resistance Meter. Visit www.prostatcorp.com
for addional informaon.
C. PRS-812 Basic Descripon & Funcons
The PRS-812 Resistance Meter has several test, display and data logging funcons:
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 automacally controls volt-
age and resistance range based on resistance characteriscs of materials being measured. In
the  mode the operator may select test voltage and and resistance range. Note that
the most ecient mode of operaon in for maximum baery life.
7
Rev. C / January 2012
PRS-812 Resistance Meter
3. The PRS-812 displays resistance Measurements in several ways:
a. 14 factory programmable LEDs each represenng 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
mulplier indicaon 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
exponenal format (1.0EXX) with Ω -TΩ indicators.
4. The PRS-812 includes data logging (storage) capabilies 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 precauons and safe measurement procedures to
avoid personnel shock and arc discharge.
A. The PRS-812 Resistance Meter is baery operated and delivers test voltages up to 100 volts.
Only use alkaline baeries 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, parcularly at
100 volts.
C. While current limited, a hazard exists in personnel reacon to a potenal shock.
D. To avoid personnel shock, follow the General Operaons instrucons at all mes. Do not touch
energized electrodes or xtures when power is applied except as specically described in this and
accessory instrucons.
E. Do not operate or store the instrument in damp environments or wet condions.
8Rev. C / January 2012
PRS-812 Resistance Meter

Storage or use of this instrument in high humidity, damp or wet condions
may cause damage to the instruments electronic circuits, eect performance
and can increase the possibility of personnel shock or arc discharge.
F. Do not use the PRS-812 in combusble or explosive environments

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 ammable areas.
G. Do not aempt 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 aempt to service or repair the PRS-812
J. Other Safety & Operang Consideraons
1. This manual displays cauons and warnings alerng the user to hazardous operaon and ser-
vicing condions.  or  headings throughout this publicaon ag this infor-
maon, where appropriate. Follow all cauon and warning instrucons 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 Electrostac Discharge Sensive (ESDS) components
and includes precision alignment of circuit elements. Only Prostat trained and
ESD Qualied instrument repair personnel should perform service.
3. The PRS-812 contains Electrostac Discharge Sensive (ESDS) components. Qualied personnel
should service it only at ESD Controlled workstaons. Do not aempt to dismantle the PRS-812
9
Rev. C / January 2012
PRS-812 Resistance Meter
without Prostat’s authorizaon and expert supervision. The instrument contains exceponally
clean circuits that are aligned and adjusted in a precise manner for opmal operaon 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 enrety before installing baeries 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 condions.
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 condensaon that may accumulate on
the instrument’s circuit boards.
 
Before operang the PRS-812 instrument become familiar with each control and display funcon. A
thorough understanding of the instruments operaon will make its use a pleasant experience, en-
hance measurement accuracy, avoid mistakes and prolong the life of the instrument.

 Toggles Through Six Operaon Modes
(1) AUTO: (AUTOMATIC) displays data in exponenal format 1.0EXX
 AUTO in exponenal 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 electricaon periods in
AUTOMATIC mode.
10 Rev. C / January 2012
PRS-812 Resistance Meter

(3) MANUAL: displays data in exponenal 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 funcon automacally based on resistance range selected. The
operator determines electricaon period in seconds (SEC) using the
displayed mer in the center of the LCD.
(5) AUTO-MANUAL: displays data in exponenal format 1.0EXX
(6) AUTO-MANUAL: displays data in Ω, KΩ, MΩ, GΩ and TΩ
In  the operator may select the inial 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
baery life. In this mode the instrument automacally controls test voltage,
range and measurement electricaon period.
11
Rev. C / January 2012
PRS-812 Resistance Meter

 Two Triangular Arrows Buons, UP () and DOWN (), select Resistance
Measurement Range in single orders of magnitude while in MANUAL or
 modes
 Manual Selecon of <10, 10 or 100 volts in  selects inial 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)
 Opmal 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 sequenally 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 informaon:
 Provides access to data in Memory
 XX Flashes in LCD indicang number of data points in the
register and the last measurement is displayed. Pressing DOWN and UP
 displays other data points and their respecve posion in the register is
shown in the  XX secon 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 () calculaon.
 Returns System to normal operaons
 If in  mode, pressing  will return the instrument to normal
measurement operaons.
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 operaons.
 In normal operaons  erases data in Memory Register, discards most
recent measurement, or turns the  funcon OFF as follows:
a. When in any operaon mode, and  is not displayed, pressing
will erase all data stored in Memory.

The process of turning the  funcon OFF will clear the Memory
Register of all stored data. Be sure that this is indeed desirable before
pressing the  buon.
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 operaon 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 unl -
 is pressed once.
 Turns instrument  for normal operaons, performs funconal & Baery
tests, turns instrument OFF.
 Displays  on LCD if baery provides acceptable voltage for accurate
measurements, or displays  if unacceptable and baeries 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

 Baery buss cut-o switch is used to isolate the main baeries from the
instrument’s circuit during baery change, instrument storage and
transport.
13
Rev. C / January 2012
PRS-812 Resistance Meter

Switch baery buss to the OFF posion before changing baeries 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 mulplier. 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 preparaon for a new measurement.
The Memory Register can store up to 80 data points.
Also idenes a displayed data points posion in the Memory Register
when in the  mode.
 Displays electricaon period required for the measurement when in 
during  and  measurement modes. In ,
provides connuous measurement ming up to 99 seconds, then restarts at
0 seconds.
14 Rev. C / January 2012
PRS-812 Resistance Meter
 Displayed when  buon is pushed second me while in  mode.
Number displayed when  is indicated is the Minimum data value in
Memory Register.
 Displayed when  buon is pushed a third me (sequenally) in 
mode. Number displayed when  is indicated is the Maximum data value
in Memory Register.
 Displayed when  buon is pushed the fourth me (sequenally) in
 mode. Number displayed when  is indicated is the Average of all
data values in Memory Register that are less than 2.0x1014 ohms. (OLs are
not included in averaging calculaon.)
 Either the  buon must be depressed a h me or 
pressed to return the system to its operaonal, measurement mode.
 Indicates that the Memory Register is  and is Recording data each me
the  buon is depressed aer 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 unl instrument is  or  is depressed.
Baery indicaon 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 secon of case, opposite LCD display. Holds two 9V-transistor baeries. Two
screws secure the baery cover. Note: Use only Long Life Alkaline Baeries. Remove baeries
when instrument is not in use for long periods of me.
 

 
For opmal baery life and avoid instrument damage, always replace the baeries with high energy,
alkaline baeries. Failure to do so will result in a diminished baery life, measurement error and potenal
instrument damage that could void the warranty.
The baery caps on the instruments you have purchased are designed to t snugly. Please follow the di-
recons below for safe replacement of baeries.
A. Slide baery bus switch to the OFF posion (see gure 3).
B. Carefully remove the baery cover from the instrument.
C. Gently take the baeries from the baery compartment.
D. Unwind any baery lead that is wrapped around the top of the baery terminal. Do not pull bat-
tery connecon leads - this could cause instrument damage.
E. Very carefully place a at head screwdriver between the baery terminals and gently li the bat-
tery cover from the baery.
Baery Buss Switch
MUST be o during
baery change.
16 Rev. C / January 2012
PRS-812 Resistance Meter
F. Properly dispose of any old baeries.
G. Posion the new alkaline baery under the baery cover.
H. With your thumb, press the terminals in place one at a me.
I. Carefully wind any excess baery lead around the baery terminal below the cap. To avoid instru-
ment damagae, do not pull baery connecon leads
J. Place the baeries back into posion with the baery terminal covers facing the lead spurce
within the baery case shown in gure 4.
K. Carefully posion the instrument baery cover back into place without force.
L. Replace the baery cover screws.
M. Slide baery buss switch to the  posion.
Following the above direcons for baery replacement will insure that you do not damage the baery
covers or wires during this process.

It is recommended to measure the voltage of each baery with a mulmeter. If the voltage of
one baery measures at or below 6.75 volts, replace that baery. If both baeries measure at
or below 6.75 volts, replace both baeries.

A. Seng up the PRS-812 for low resistance range calibraon
1. Posion Baery Buss Cut O switch to OFF posion
2. To install baeries, remove two Phillips locking screws and cover. Aach two Long-Life, Alkaline
9V baeries to the baery connecon terminals.
3. Posion baeries in compartment with power leads neatly posioned above baery connec-
ons. Carefully re-install baery cover and locking screws.

Do Not change baeries with the baery buss . Always switch Baery Buss Cut O to OFF
when changing baeries. Should the  buon be depressed during baery change and
Baery Bus is  the instrument may lock up and not funcon properly or be seriously dam-
aged. In this case, simply disconnect the baeries, then re-install with Baery Buss switch in
the OFF posion.
B. Low Resistance Range (<10 Ohms) Calibraon
1. Install the calibraon shunt (PRS-801CC) across the Negave (-) and Posive (+) Lead Terminals
(Figure 5, below).
17
Rev. C / January 2012
PRS-812 Resistance Meter

2. Press the Red  power buon. The instrument display should become energized, each
LED will be tested in sequence, and  will is displayed in the LCD if the baeries have
sucient test capacity (gure 9).




3. Allow the instrument circuits to warm-up for a few minutes; approximately 2 - 3 minutes are
sucient, prior to compleng the calibraon sequence.
4. Press  once to shi display to ohms mode (Ω).
5. Press the Yellow , then the Gray  buon within ½ second. The message  will be
displayed in the LCD. (See Figure 8)
6. Press the Yellow RESET buon to complete low range (0.1 to 10 ohm) calibraon. The  mes-
sage will automacally be cleared when  is pressed. (See Figure 8)
7. Press the Green  buon. 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 calibraon process.
18 Rev. C / January 2012
PRS-812 Resistance Meter
8. Remove the calibraon 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 Operaon & Measurement Test Cycle Sequence
The following 10 points provide a general overview for calibrang and using the PRS-812 for resis-
tance measurements.
1. Slide Baery Buss Cut O switch to 
2. Press Red buon once to power up PRS-812
a. Instrument performs circuit check, and tests LED’s, LCD display, and baery voltage.
b. LCD displays  if baery voltage suitable for instrument operaon; displays  if bat-
teries require replacement
c. Instrument ends startup sequence in default , Exponent Display Mode 1.0EXX
3. Select Funcon Mode if other than , Exponent Display Mode 1.0EXX is desired by press-
ing  buon
4. Perform low resistance range calibraon aer 3 minute instrument warm-up, if desired
a. Install Calibraon Shunt between posive (+) and negave (-) terminals
b. Press  then  within ½ second
19
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  buon to prepare instrument for the next measurement
g. Repeat calibraon procedure if necessary
h. Remove Calibraon Shunt
5. Carefully connect test leads to posive (+) [Power] and negave (-) [Sensing] terminals. Insert
right angle sleeved banana into instrument terminal, press gently while twisng into posion.
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  buon to iniate Automac measurement Test Cycle
a. The resistance range is reset to minimum (0.1Ω). It is automacally adjusted in conjuncon
with the resistance characteriscs of the materials under test, based on:
(1) Test voltage; and,
(2) Current ow.
b. Test Voltage is reset to <10V and automacally increased in accordance with the following
material resistance characteriscs:
(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. Electricaon period, i.e., the me period during which test voltage is applied to the ma-
terial under test, is automacally adjusted to the PRS-812’s measurement characteriscs
and industry standards (ANSI/ESD STM11.11). Typical electricaon 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, consecuve
measurements, each within ±5% of each other.
b. The display is connuously recalculated and updated during the measurements elec-
tricaon period.
c. The nal displayed measurement is the averaged result of the last eight (8) individual,
consecuve measurements, each within ±5%, at the end of the electricaon period.
d. If the material or test condions vary such that eight consecuve measurements, each
within ±5% of each other cannot be obtained, the PRS-812 will extend the electrica-
on period unl the measurement criteria are met; or,
e. The electricaon period will automacally be terminated and the most recent aver-
aged result of eight (8) individual, consecuve 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 condions.
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 condions.
9. To save the displayed measurement in the Memory Register and prepare the PRS-812 for the
next measurement, press the Yellow  buon. Pressing  causes three funcons:
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 funcon mode in preparaon 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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Prostat PRS-812 User manual

Category
Measuring, testing & control
Type
User manual
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