Prostat PAS-853B User manual

User Manual
PAS-853B
wide range ohmmeter


  Page
I. Introducon & Descripon 4
II. Baery Installaon 6
III. Resistance Measurements in Automac Mode 8
IV. Electricaon Period in AUTO/GO A Mode 9
V. Measurements in Manual Mode 9
VI. Null Adjustment for Lead Resistance 10
VII. Baery Replacement 13
VIII. User Adjustments & Maintenance 14
IX. Warranty Informaon 14
General Specicaons 16

Copyright © 2016 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. A / February 2016
PAS-853B Wide Range Ohmmeter
 
The PAS-853B instrument is a wide range ohmmeter that measures accurately from 0.01 to <1.0x1013
ohms, i.e., 9.99x1012 ohms. In its AUTO mode the instrument automacally adjusts resistance range
and selects test voltage in accordance with standard pracces outlined in ANSI/ESD STM11.11, and
meets audit requirements of ESD TR53:
• <10 Volts Variable are applied from 0.01 to 9.9x103 ohms and provides audible connuity indica-
on below 1.6 ohms
• 10 Volts ± <0.5V (±<5% Constant Voltage, i.e., Under Load) applied from 1.0x104 to 9.99x105 ohms
• 100 Volts ± <5V (±<5% Constant Voltage, i.e., Under Load) applied from 1.0x106 to <1.0x1013 i.e.,
9.99x1012 ohms
GREEN HOLD LED
ON WHEN HOLDING
MEASUREMENT IN
DISPLAY
GREEN TEST PAD
STARTS MEASURE-
MENT & USED FOR
OPERATION MODE
SELECTION
MAIN POWER
SLIDE SWITCH
ON/OFF
LIQUID CRYSTAL DISPLAY
(LCD) DISPLAYS & HOLDS
DATA FOR 10 SECONDS
YELLOW MODE PAD
OVERRIDES HOLD, PRO-
VIDES VOLTAGE SELEC-
TION AND CHANGES
INSTRUMENT OPERATION
BETWEEN AUTO AND
CONTINIOUS MODES
RED POSITIVE (+)
TEST VOLTAGE
BLACK NEGATIVE (-)
CURRENT SENSING
WHITE SHIELDING
CONNECTION

5
Rev. A / February 2016
PAS-853B Wide Range Ohmmeter
A. Modes of Operaon
There are two main Modes of PAS-853B Operaon
 AUTO mode (Displayed as GO A): Automacally adjusts resistance range, test voltage and Elec-
tricaon Period (EP). Measurements stops at the end of EP, Green LED is , measurement is
displayed for 10 seconds then instrument resets for the next measurement.
  mode (Displayed as GO C): Funcons as in
AUTO mode by automacally adjusng resistance range
and test voltage, but connues to measure unl the
operator presses MODE, or restarts the measurement by
pressing TEST. GO C disables electricaon period control.
3. Manual Voltage Selecon can be made in either AUTO or
 modes by pressing the  pad before
starng the measurement.
a. To change the mode of operaon simultaneously press
and release the  and  pads.







6Rev. A / February 2016
PAS-853B Wide Range Ohmmeter
 
• Baery Main Power OFF
• Open Baery Cover
• Replace Baery (9V Alkaline)
• Close Cover
A. Install test leads or special xtures as shown:
1. Slide  Switch to 
2. “Go A” is the Default Operaon Mode and is displayed when
 is 
3. To Start Measurement use the Green  Pad
a. Press & release Pad
b. Measurement sequence is conducted automacally; ends
when Green  LED is 
c. Press  to interrupt or clear measurement
4. Data is displayed in the LCD & Hold Indicator LED [Top Panel]
glows green. Press the Yellow  buon once to erase the
data.
 Press  to restart the measurement at any me
B. The  buon performs four useful funcons:


-




 Shield
 Current Sensing
 Test Voltage

7
Rev. A / February 2016
PAS-853B Wide Range Ohmmeter
1. Override Displayed Data Hold: Resets the instrument for the next measurement and bypasses
the automac  funcon. Note that the exisng measurement in the display is discarded.
2. Used with  pad to change modes of operaon between 
 operaon
3. Selects funcon and starng test voltage for AUTO, or  mode
4. Iniates CAL? and Null funcons:
a. NULL Funcon: Is used to measure lead resistance and adjust the measurement circuit to
compensate for lead resistance. Properly used, when shorted together with supplied shunt
lead resistance should measure close to zero (0) i.e. 0 to 0.2E-1 ohms, aer the measure-
ment circuit is adjusted to compensate for lead resistance. (See Null Adjustment for Lead
Resistance)
b. CAL? Funcon: Is used by qualied Prostat® trained technicians to adjust instrument test
voltages using a special technique to maintain specicaon performance. Do not try to
adjust test voltages. Exit out of CAL?
5. Mode Sequence For manual selecon of test voltage:
a. First Press: Manual <10 Volt Test Voltage
b. Second Press: Manual 10 Volt Constant Test Voltage
c. Third Press: Manual 100 Volt Constant Test Voltage
d. Fourth Press: Return to AUTO mode operaon
C. Connecons
Leads are connected to the Posive (+) and Negave (-) receptacles for
resistance instrument measurements. The Black Prostat PAS-853BLB
sensing lead incorporates shielding; the shield is connected to the instru-
ment via the White banana plug and receptacle, as shown in Figure 7.
Receptacles are separated by ¾ inch spacing (see Figure 10) to accom-
modate dual banana plug connectors. These connectors are used for the
Prostat® type PRF-912B and PRF-922B microprobe resistance measurement xtures.
Leads supplied with the PAS-853B are specially designed for this instrument. They have superior
outer insulaon and a high number of stranded conductors to minimize measurement errors.
1. Be aware that non-Prostat leads may not provide similar performance and will require recali-
braon of the Null point to improve measurement accuracy.
2. Always use Prostat supplied leads with Prostat equipment for best performance.
a. Lead quality and length aect instrument accuracy. This is due to several factors such as
insulaon resistance, lead inductance and capacitance, as well as transmied “noise” in the


8Rev. A / February 2016
PAS-853B Wide Range Ohmmeter
environment. To minimize the eect of noise and transmied energy on measurement ac-
curacy, the black sensing lead is shielded.
b. Long 200 cm leads are supplied for auding purposes where lead length is physically neces-
sary. Long Prostat leads will allow the instrument to perform within its targeted perfor-
mance.
-




An auxiliary Remote Control connecon is installed for calibraon and future applicaon purposes.
 
In the default AUTO mode the instrument makes range and test voltage
adjustments automacally, depending on the resistance of the material
or object being measured, and in accordance with standard measurement
protocol.
A. Once leads are installed, slide the Main Power switch to .
B. Note that a yellow LED above AUTO lights to indicate the instrument is
in automac mode.
C. With leads installed press and release the  pad. The measurement
sequence will be conducted automacally unl either the Green LED
illuminates, or
a. The test is interrupted by pressing the  buon once, or
b. The  buon is pressed to restart the measurement sequence.


9
Rev. A / February 2016
PAS-853B Wide Range Ohmmeter

Test Voltage is supplied through the Red Posive (+) terminal. To measure in accordance
with industry standard protocol Test Voltage is applied during the measurement starng
at <10 volts (variable), and then automacally increased to constant 10 volts, or constant
100 volts as necessary. When applied, Test voltage magnitude is indicated on the front
panel by the illuminated yellow LED above the applicable voltage.
D. Record your measurement as may be required.
 Measurements will be erased and the instrument reset to zero for the next measurement
aer 10 seconds.
 
Electricaon Period (EP) is the me required for an instrument to make a measurement from zero
(0) to within 5% of 1.0x1012 ohms at 100 volts, plus 5 seconds. The EP is used for resistance measure-
ments equal to, or greater than 1.0x106 ohms. The PAS-853B was designed to incorporate variable EP
to allow fastest possible, accurate measurements. Typical EP up to less than 1.0x109 ohms is typically
less than 8.0 seconds. However, measurement condions in the factory environment vary consider-
ably. To compensate for variables in materials and condions, the PAS-853B makes many measure-
ments each second and evaluates their consistency and stability. If necessary the PAS-853B will au-
tomacally extend the measurement me (EP) to insure an accurate representaon of the material
under test.
The PAS-853B measurement process is quite fast and once a measurement is stable in the LCD, the
operator may elect to use the stable displayed measurement. In this case the EP is manually deter-
mined by the operator. This is an ecient operang procedure for determining if the measurement
is generally within the required range for the object being audited. In this case, the operator usually
observes and conrms measurement stability, which results in faster audit measurements. However,
if the measurement is of a crical nature, or being used for material qualicaon purposes, the full EP
for that measurement should be employed, i.e., when the measurement is completed and displayed,
and the Green LED comes  as described below.
If the operator desires the EP to be determined by the instrument in  mode, the Green
Hold LED illuminates when the appropriate measurement period for each measurement is reached. It
takes into account the material variables seen during the measurement and adjusts the EP for opmal
measurement accuracy. Typical EP’s for the PAS-853B instrument are:
0.01 to 1.0E9 ohms: Typically 2 to 8 seconds (Range Average 6.0 seconds)
1.0E09 to 1.0E11 ohms: 7 to 10 seconds
>1.0E11 to <1.0E13 ohms: 10 to 25 seconds
These values are variable and based on the stability of the materials being measured, as well as the envi-
ronmental condions. For example, while the default EP for the PAS-853B instrument is 7.5 seconds, EP
automacally adjusts to enhance measurement accuracy.

10 Rev. A / February 2016
PAS-853B Wide Range Ohmmeter
 
To manually select a specic test voltage, once leads or xtures are
installed, slide the Main Power switch to .
A. Press the  buon one me and note the illuminated LED
above AUTO is OFF, and the LED above , is ON. This means the
test voltage is manually set to vary from approximately 1 mv to less
than 10 volts, depending on the resistance being measured.
B. Pressing the  buon a second me turns the LED adjacent to
<10V OFF, and the LED next to 10V ON. This indicates all measure-
ments will be made at a constant test voltage of 10 volts, which may
vary up to <0.5V depending on material resistance.
C. Pressing the  buon a third me moves illuminates the LED
above 100V, which provides a constant test voltage of 100V ± <2.0
Volts.
D. Press and release the  pad to make the measurement.
E. Record the measurement within 10 seconds following the illumina-
on of the Green  LED.
F. Resistance measurement ranges in Manual mode are as follows.
@<10 Volts (Variable): 0.1E-1 to 1.0E9 Ohms
@10 Volts (Constant): 1.0E4 to 1.0E10 Ohms
@100 Volts (Constant): 1.0E6 to 9.99E12 Ohms
 
To  lead resistance means to compensate for, or to subtract lead resistance from the measurement
so that only the item or circuit resistance being measured is displayed in the LCD. This is especially impor-
tant when making low resistance measurements less than 1.0 or 2.0 ohms. Two 200 cm Prostat leads have
a combined resistance of approximately <0.35 ohms.
A. One method for making low resistance measurements is to determine lead resistance by shorng
the leads together with the supplied shorng shunt and press TEST to measure their resistance.
B. If less than 0.02E-1 ohms is displayed, virtually all lead resistance has been removed from the mea-
surement
C. If a value 0.2E0 or greater is displayed, either:
1. Perform the  procedure described below, or
2. Subtract that value from the nal measurement
3. Either 1 or 2, above, are acceptable for low resistance measurements depending on applicaon
requirements


11
Rev. A / February 2016
PAS-853B Wide Range Ohmmeter




D. To adjust the PAS-853B to compensate for lead resistance connect the leads to the instrument
and then short the leads together using the supplied shorng connector (shunt). The instrument
should be OFF before starng this sequence.
1. Press and hold the  buon while simultaneously sliding the Main Power switch to .
Connue to hold the  buon down unl the unit goes through its startup roune, then
CAL? is displayed in the LCD. Release the  buon.




12 Rev. A / February 2016
PAS-853B Wide Range Ohmmeter
2. While CAL? is displayed press  one me and nULLr? will be displayed.
NULL-

r nULL
3. Press  briey so that “r nULL” is displayed in the LCD, which begins the automac Null ad-
justment process. This automac process requires 10 to 12 seconds to complete. Do not touch
the instrument controls during this period – simply allow it to go through its lead measurement
sequence.
4. Aer 10+ seconds the lead resistance will be displayed in the LCD.
a. Press  to start memory sequence
b. E12 C? will be displayed; Press .
c. Then “StorE?” will be displayed. Press  to complete sequence.


13
Rev. A / February 2016
PAS-853B Wide Range Ohmmeter
5. Once the lead resistance is stored in memory, the unit restarts. During startup the instrument
rmware ID version is displayed when the instrument is ready to take measurements Go A is
displayed.


To conrm the adjustment was made, press the  pad to measure the leads while sll
shorted together. Lead resistance should be very low i.e., 0.0E-1 to 0.2E-1 ohms. If not,
repeat the Null adjustment process again.

Before replacing the single 9V alkaline baery, slide the Main Power switch
to OFF. Open the baery compartment by removing the small #1 Philips
head screw. The baery is located in a small sealed compartment. Carefully
remove the baery and disconnect the terminal cap from the baery.
DO NOT PULL THE WIRES TO RELEASE THE TERMINAL CONNECTOR!
CAREFULLY PRY THE TERMINAL CAP FROM THE BATTERY TO PREVENT
DAMAGE
Connect the new alkaline baery to the terminal and replace it in the
spring clamp; replace the baery cover. Use only alkaline baeries for long
life and to AVOID DAMAGE to the unit. Do not use standard carbon baer-
ies as they:
• Will not last nearly as long as alkaline baeries
• May overheat causing instrument damage
• Will VOID the instrument’s warranty
-


14 Rev. A / February 2016
PAS-853B Wide Range Ohmmeter
 
The primary user adjustments are limited and have been previously described in this manual, i.e., the
Null adjustment to compensate for test lead resistance. There is no reason for the operator or unau-
thorized personnel to break the warranty seal and open the unit. The instrument’s circuits and me-
chanical connecons have been precisely installed and the instrument tested.
Annual calibraon includes measurement of test voltage under load and a series of funconal resis-
tance test measurements. A Prostat Authorized Calibraon Laboratory should make these measure-
ments and adjustments if necessary. NOTE: THE INSTRUMENT IS NOT OPENED FOR, OR DURING
CALIBRATION, WHICH IS PERFORMED ELECTRONICALLY.
 
A. Limited Warranty & Limitaon of Liability
Each Prostat® product is warranted to be free from defects in material and workmanship under
normal use and service. The warranty period is one (1) year and begins on the date of shipment.
This warranty extends only to the original buyer or end-user customer of a Prostat Authorized
Reseller, and does not apply to fuses, disposable baeries or to any product which, in Prostat’s
opinion, has been misused, altered, neglected or damaged by accident or abnormal condions of
operaon or handling. Prostat warrants that soware will operate substanally in accordance with
its funconal specicaons for 90 days and that it has been properly recorded on non-defecve
media. Prostat does not warrant that soware will be error free or operate without interrupon.
Prostat Authorized Resellers shall extend this warranty on new and unused products to end-user
customers only but have no authority to extend a greater or dierent warranty on behalf of Pros-
tat. Warranty support is available if product is purchased through a Prostat authorized sales outlet
or Buyer has paid the applicable internaonal price. Prostat reserves the right to invoice Buyer for
importaon costs of repair/replacement parts when product purchased in one country is submit-
ted for repair in another country.
Prostat’s warranty obligaon is limited, at Prostat’s opon, to refund of the purchase price, free
of charge repair, or replacement of a defecve product which is returned to a Prostat authorized
service center within the warranty period. This warranty does not apply to roune calibraon of
the instrument.
To obtain warranty service, contact your nearest Prostat authorized service center or send the
product, with a descripon of the diculty, postage and insurance prepaid (FOB Desnaon), to
the nearest Prostat authorized service center. Prostat assumes no risk for damage in transit. Fol-
lowing warranty repair, the product will be returned to Buyer, transportaon prepaid (FOB Desna-
on). If Prostat determines that the failure was caused by misuse, alteraon, accident or abnormal
condion of operaon or handling, Prostat will provide an esmate of repair costs and obtain
authorizaon before commencing the work. Following repair, the product will be returned to the
Buyer transportaon prepaid and the Buyer will be billed for the repair and return transportaon
charges (FOB Shipping Point).
THIS WARRANTY IS BUYER’S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER WAR-
RANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. PROSTAT SHALL NOT BE LIABLE FOR
ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES, INCLUDING LOSS
OF DATA, WHETHER ARISING FROM BREACH OF WARRANTY OR BASED ON CONTRACT, TORT, RELI-
ANCE OR ANY OTHER THEORY.

15
Rev. A / February 2016
PAS-853B Wide Range Ohmmeter

Prostat expressly warrants that for a period of 90 Days from the date of repair, by Prostat, instru-
ments and products will be free of defects in material (parts) and workmanship (labor). If Pros-
tat receives noce of such defect during the warranty period, Prostat will replace or repair at its
expense such parts which it determines to be defecve. Any defecve part must be returned to
Prostat® postage prepaid with proof of purchase date. This warranty does not apply to roune
calibraon of the instrument.
Warranty Exclusions - THE FOREGOING EXPRESS WARRANTY IS IN LIEU OF ALL OTHER WARRAN-
TIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MER-
CHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. PROSTAT SHALL NOT BE LIABLE FOR ANY
SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES, INCLUDING LOSS OF
DATA, WHETHER ARISING FROM BREACH OF WARRANTY OR BASED ON CONTRACT, TORT, RELI-
ANCE OR ANY OTHER THEORY.
The express warranty does not apply to fuses, disposable baeries or to any product which, in
Prostat’s opinion, has been misused, altered, neglected or damaged by accident or abnormal con-
dions of operaon or handling.

In no event will Prostat or any authorized reseller be responsible or liable for special, incidental, or
consequenal losses or damages, under any legal theory including but not limited to contract, neg-
ligence, or strict liability. Fulllment by Prostat of its express warranty obligaons described above
will be Buyer’s exclusive remedy and will be
Prostat’s and authorized reseller’s limit of liability for any breach of warranty or otherwise.

Prostat’s instruments and xtures shall be operated at 65 – 90° Fahrenheit (18 – 32° Celsius), 10
– 60 % Relave Humidity. Prostat recommends making measurements using its instruments and
xtures in an environment of 72 – 76° Fahrenheit (22 – 24° Celsius), 25 – 35% Relave Humidity.

16 Rev. A / February 2016
PAS-853B Wide Range Ohmmeter



Slide Switch ON SIDE OF CASE
: Energizes instrument and LCD displays Soware Version then GO A with AUTO indicaon (Default)
OFF: Isolates baery and DC voltage from instrument controls and circuit. Use for transport and storage

With Test Leads installed: Press once & Release. Measurements performed automacally.
In conjuncon with MODE changes from Auto operaon to Connuous.

Steps through Auto/Voltage ranges with each press of MODE Pad:
• AUTO: Default automac resistance range & Voltage control
• <10V: Manual Operaon 0.01 to ≤10V Test Voltage;
- Resistance Range: 0.01E-1 to 9.99E9 Ω
• 10V: Manual Operaon at 10V (Nominal, Semi-Constant)
- Resistance Range: 0.98E4 to 9.99E10 Ω
• 100V: Manual Operaon at 100V (±<5V) Constant Voltage
- Resistance Range: 0.98E6 to 9.99E12 Ω
- When data in , press  to terminate  without changing operaonal mode
- Press  with  to change from Auto to Connuous
- Used to measure lead resistance (NULL)
- Used by Prostat Authorized Technicians for Voltage Calibraon

 Test Voltage (RED) – Supplies test voltage to electrodes/xtures
 Current sensing (BLACK) – Conducts current from electrode, xtures or Ground to instrument
  Shielding connecon to chassis (WHITE) – Reduces transmied energy and eect on current
measurement.
 ¾ inch spacing between RED and BLACK accommodates dual banana BNC adapters
 Colored LED’s indicate instrument operaonal  and Test Voltage (YELLOW) used for
the current measurement, as well as measurement compleon (GREEN LED).
• AUTO:  during automac operaons; OFF in Manual mode
• <10V:
• 10V
• 100V
• GREEN LED: Measurement hold

17
Rev. A / February 2016
PAS-853B Wide Range Ohmmeter

 1Nominal performance by range:
0.01E- 1 – 1.0E 0 Ω <±10%, ±2 Counts
1.0E 0 – 9.99E10 Ω <±2%, ±2 Counts
1.0E11 – 9.99E12 Ω <± 10%, ±4 Counts
 Automacally selected and controlled in AUTO mode. May be manually selected
by pressing  pad in the following order:
• <10V Variable based on resistance load
- Provides 0.001 to ≤10V
- Funconal in AUTO within range 0.01 Ω - <1.0E+4 Ω
- Manual Operaon Resistance Range: 0.01E-1 to 9.99E+9 Ω
• 10V Constant Voltage (Under Load)
- Test Voltage Varies ± <5% in AUTO or Manual Operaons
- Funconal in AUTO within range 1.0E+4 Ω - <1.0E+6 Ω
-Manual Operaon Resistance Range: 0.9E+4 to 9.99E+10 Ω
• 100V Constant Voltage (Under Load)
- Test Voltage Varies ± <2% in AUTO or Manual Operaons
- Funconal in AUTO within range 1.0E+6 Ω - <1.0E+13 Ω
- Manual Operaon Resistance Range: 0.90E6 to 9.99E12 Ω
• Returns to Auto Mode

 <3mA @ 100V

 GO A: Performs all automac and manual voltage select funcons, stops and dis
plays measurements aer Electricaon Period (EP) is complete, then displays data
with Green LED ON for 10 seconds.
GO C: Performs all automac and manual voltage select funcons, connuously
displays measurements unl the operator presses  or  pads. GO C
disables electricaon period controls.
 One 9V alkaline transistor baery; baery life > 50 hours
 7.25 in. (184 mm) x 4.3 in, (109 mm) x 1.4 in. (36 mm)
 13.2 oz. (375 gram) with baery installed
   1Tolerance and accuracy measurements were conducted under controlled condions with
close tolerance reference resistors. Do not aempt to open instrument case.
• No internal operaonal parts or adjustments
• Provides access to 100DCV power supply
• Damage to instrument and environmental seals may occur
• Will void warranty
• Store instrument in case and dry environment


18 Rev. A / February 2016
PAS-853B Wide Range Ohmmeter


19
Rev. A / February 2016
PAS-853B Wide Range Ohmmeter


20 Rev. A / February 2016
PAS-853B Wide Range Ohmmeter