Prostat PAS-853B Bedienungsanleitung
User Manual
PAS-853B
wide range ohmmeter
Page
I. Introducon & Descripon 4
II. Baery Installaon 6
III. Resistance Measurements in Automac Mode 8
IV. Electricaon Period in AUTO/GO A Mode 9
V. Measurements in Manual Mode 9
VI. Null Adjustment for Lead Resistance 10
VII. Baery Replacement 13
VIII. User Adjustments & Maintenance 14
IX. Warranty Informaon 14
General Specicaons 16
Copyright © 2016 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. 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 automacally adjusts resistance range
and selects test voltage in accordance with standard pracces 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 connuity 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 Operaon
There are two main Modes of PAS-853B Operaon
AUTO mode (Displayed as GO A): Automacally adjusts resistance range, test voltage and Elec-
tricaon 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): Funcons as in
AUTO mode by automacally adjusng resistance range
and test voltage, but connues to measure unl the
operator presses MODE, or restarts the measurement by
pressing TEST. GO C disables electricaon period control.
3. Manual Voltage Selecon can be made in either AUTO or
modes by pressing the pad before
starng the measurement.
a. To change the mode of operaon simultaneously press
and release the and pads.
6Rev. A / February 2016
PAS-853B Wide Range Ohmmeter
• Baery Main Power OFF
• Open Baery Cover
• Replace Baery (9V Alkaline)
• Close Cover
A. Install test leads or special xtures as shown:
1. Slide Switch to
2. “Go A” is the Default Operaon Mode and is displayed when
is
3. To Start Measurement use the Green Pad
a. Press & release Pad
b. Measurement sequence is conducted automacally; 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 buon once to erase the
data.
Press to restart the measurement at any me
B. The buon performs four useful funcons:
-
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 automac funcon. Note that the exisng measurement in the display is discarded.
2. Used with pad to change modes of operaon between
operaon
3. Selects funcon and starng test voltage for AUTO, or mode
4. Iniates CAL? and Null funcons:
a. NULL Funcon: 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, aer the measure-
ment circuit is adjusted to compensate for lead resistance. (See Null Adjustment for Lead
Resistance)
b. CAL? Funcon: Is used by qualied Prostat® trained technicians to adjust instrument test
voltages using a special technique to maintain specicaon performance. Do not try to
adjust test voltages. Exit out of CAL?
5. Mode Sequence For manual selecon 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 operaon
C. Connecons
Leads are connected to the Posive (+) and Negave (-) 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 insulaon 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-
braon 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 aect instrument accuracy. This is due to several factors such as
insulaon resistance, lead inductance and capacitance, as well as transmied “noise” in the
8Rev. A / February 2016
PAS-853B Wide Range Ohmmeter
environment. To minimize the eect of noise and transmied energy on measurement ac-
curacy, the black sensing lead is shielded.
b. Long 200 cm leads are supplied for auding 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 connecon is installed for calibraon and future applicaon purposes.
In the default AUTO mode the instrument makes range and test voltage
adjustments automacally, 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 automac mode.
C. With leads installed press and release the pad. The measurement
sequence will be conducted automacally unl either the Green LED
illuminates, or
a. The test is interrupted by pressing the buon once, or
b. The buon is pressed to restart the measurement sequence.
9
Rev. A / February 2016
PAS-853B Wide Range Ohmmeter
Test Voltage is supplied through the Red Posive (+) terminal. To measure in accordance
with industry standard protocol Test Voltage is applied during the measurement starng
at <10 volts (variable), and then automacally 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
aer 10 seconds.
Electricaon 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 condions in the factory environment vary consider-
ably. To compensate for variables in materials and condions, the PAS-853B makes many measure-
ments each second and evaluates their consistency and stability. If necessary the PAS-853B will au-
tomacally extend the measurement me (EP) to insure an accurate representaon 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 ecient operang 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 conrms measurement stability, which results in faster audit measurements. However,
if the measurement is of a crical nature, or being used for material qualicaon 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 opmal
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 condions. For example, while the default EP for the PAS-853B instrument is 7.5 seconds, EP
automacally adjusts to enhance measurement accuracy.
10 Rev. A / February 2016
PAS-853B Wide Range Ohmmeter
To manually select a specic test voltage, once leads or xtures are
installed, slide the Main Power switch to .
A. Press the buon 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 buon 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 buon 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 shorng
the leads together with the supplied shorng 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 applicaon
requirements
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