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20

 

PRS-812 Resistance Meter 

 

7.  Measurements Less than 10,000 ohms (<1.0x10

4

 ohms):  

 

a.   When the resistance measurement is less than 1.0x10

4

 ohms, test voltage will remain 

at 

<10V

, the resistance range will be adjusted automatically and a stable resistance 

measurement will be obtained within 2.0 to 3.0 seconds. 

 

b.   Once a stable measurement is confirmed and displayed by the instrument, 

HOLD

 will 

be energized in the LCD and the electrification timer will stop. 

 
c.   An LED corresponding to the measurement’s order of magnitude will be energized 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Figure 10:

 Comparing PRS-812 Display in Automatic Ohms Mode and Automatic Exponential Mode after the same 

low resistance measurement. 

8. Measurements from 1.0x10

4

 to less than 1.0x10

6

 ohms: 

 

a.  

When the resistance measurement is 
greater than 1.0x10

4 

ohms test voltage 

will automatically be increased to 

10 

volts, and the resistance range will be 
adjusted as necessary. 

 

b.  

A stable resistance measurement will be 
obtained within 2.0 to 4.0 seconds. 

 

c.  

Once a stable measurement is 
confirmed and displayed, 

HOLD

 will be 

energized in the LCD and the 
electrification timer will stop.  

 

d.  

An LED corresponding to the 
measurement’s order of magnitude will 
be energized 

 

 

Measuring 958

 in Auto Ohms Mode

Measuring 958

 in Auto Exponential Mode 

Analog Scale & 
X100 Multiplier 

<E03 
LED 

<E03
LED 

RECord & 
Ohms Range 
Indicators 

<10 Volts 
Test Voltage 

HOLD Indicates 
Measurement 
Is Complete 

RECord & 
Ohms Range 
Indicators 

<10 Volts 
Test Voltage 

HOLD Indicates 
Measurement 
Is Complete 

 

Electrification Remains 2.0 – 3.0 sec. 
on Measurements <1.0E+06 Ohms 

Test Voltage Automatically shifts to 
10 V @ 1.0E+04 Ohms 

Note K

 

Indicator 

E04 
LED 

Figure 11:

 Test Voltage at 10 Volts from 1.0E+04 to 

<1.0E+06 Ohms in Auto 

Summary of Contents for PRS-812

Page 1: ...P R O F E S S I O N A L S T A T I C C O N T R O L P R O D U C T S Operations Manual Resistance Meter PRS 812 ...

Page 2: ...in the United States of America No part of this manual may be used or reproduced in any manner whatsoever without written permission For information contact PROSTAT Corporation 1072 Tower Lane Bensenville IL 60106 PROSTAT is the registered trademark of PROSTAT Corporation ...

Page 3: ...TANCE METER Title Page I Introduction Description 2 II Cautions Warnings 5 III Controls Connections Indicators 7 IV Setup Calibration 13 V Instrument Operation 15 VI Instrument Maintenance 29 VII Warranty Information 29 General Specifications 31 Instrument Controls 32 ...

Page 4: ......

Page 5: ... 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 sophisticated in design the PRS 812 Resistance Meter is easy to use and extremely helpful in making accurate ESD auditing measurements or general resistance and continuity checks CAUTION To avoid electrical shock or damage to t...

Page 6: ...1 0EXX IND T AUTO AUTO AUTO AUTOMATIC RESISTANCE RANGE TEST VOLTS ELECTRIFICATION DISPLAY HOLD AUTOMATIC 2 OHMS T AUTO AUTO AUTO SEE TABLE NOTE 1 MANUAL 1 1 0EXX IND T MANUAL MAN MAN or AUTO TEST ONLY NO DISPLAY HOLD UL UNDER DECADE LEVEL MANUAL 2 OHMS T MANUAL MAN MAN or AUTO SEE TABLE NOTE 2 MANUAL AUTOMATIC 1 1 0EXX IND T AUTO MANUAL MAN Start AUTO Run AUTO MANUAL SETUP STARTING DECADE AUTO ADJ...

Page 7: ... be desired by the user the program may be modified by PROSTAT during routine annual calibration or upon request A modest service charge is required for this service LED colors include GREEN RED YELLOW and OFF Blank b The large Liquid Crystal Display LCD includes an analog 1 10 scale and X1 X10 and X100 multiplier indication for measurement in K M G and T c Digital measurements are provided using ...

Page 8: ...tions may cause damage to the instrument s electronic circuits effect performance and can increase the possibility of personnel shock or arc discharge G Do not use the PRS 812 in combustible or explosive environments WARNING Improper handling and use of energized circuits may cause arc discharge which in turn may cause the ignition of combustible materials or fumes Do not use exposed energized cir...

Page 9: ...t Do not expose the instrument to wet extremely hot or cold conditions 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 condensation that may accumulate on the instrument s circuit boards III Controls Connections Indicators Before operating the PRS 812 instrument become familiar with each control and...

Page 10: ...strument controls resistance ranges test voltage and electrification periods 3 MANUAL displays data in exponential format 1 0EXX 4 MANUAL displays data in K M G and T In MANUAL the operator selects resistance range in single decade increments Test voltage may be selected by the operator or allowed to function automatically based on resistance range selected The operator determines electrification ...

Page 11: ... is not displayed in the lower left corner of the LCD pressing RECORD RECALL once turns Memory Register ON REC will then be displayed in LCD If REC is ON and measurement data is stored in memory pressing RECORD RECALL once will provide access to the memory register Pressing RECORD RECALL successively will calculate and sequentially display Minimum MIN Maximum MAX and Average AVG of data stored in ...

Page 12: ... d When in any operation mode and HOLD is not displayed pressing CLEAR will erase all data stored in the Memory Register Pressing OFF will disable the REC mode and the instrument will be de energized When powered up again the REC mode will remain disabled until RECORD RECALL is pressed once 7 ON OFF Turns instrument ON for normal operations performs functional Battery tests turns instrument OFF 8 ...

Page 13: ...nts darken to indicate measurement integer X1 X10 or X100 darken to indicate the scale multiplier Combine the Analog indicators with K M G and T symbols to obtain an analog measurement MEM 00 Provides the number of data points stored in the Memory Register when REC is ON and instrument is RESET in preparation for a new measurement The Memory Register can store up to 80 data points 00 SEC Display s...

Page 14: ...urement between 0 1 and 999 ohms K Indicates measurements from 1 000 1 0x103 to 990 000 9 9x105 ohms M Indicates measurements from 1 000 000 1 0x106 to 999 000 000 9 9x108 ohms G Indicates measurements from 1 000 000 000 1 0x109 to 999 000 000 000 9 9x1011 ohms T Indicates measurements from 1 000 000 000 000 1 0x1012 to 999 000 000 000 000 9 9x1014 ohms 100 V Indicates 10 10 or 100 volts being app...

Page 15: ...onnections Carefully re install battery cover and locking screws NOTE Do Not depress Red ON OFF button during battery installation while Battery Buss Cut Off is ON Always switch Battery Buss Cut Off to OFF when changing batteries Should the ON OFF button be depressed during battery change and Battery Bus is ON the instrument may lock up and not function properly In this case simply disconnect the ...

Page 16: ...to complete low range 0 1 to 10 ohm calibration The CAL message will automatically be cleared when RESET is pressed See Figure 7 6 Press the Green TEST button Indicated resistance should be 1 02 0 02 ohms as shown in Figure 7 Press RESET to clear the display NOTE If 1 02 0 02 ohms is not displayed repeat the calibration process 7 Remove the calibration shunt from the lead terminals 8 The PRS 812 i...

Page 17: ...ss Red ON Off button once to power up PRS 812 a Instrument performs circuit check and tests LED s LCD display and battery voltage b LCD displays Good if battery voltage suitable for instrument operation displays Lo if batteries require replacement c Instrument ends startup sequence in default AUTO Exponential Display Mode 1 0EXX 3 Select Function Mode if other than AUTO Exponential Display Mode 1 ...

Page 18: ...lly increased in accordance with the following material resistance characteristics 1 10 Volts 0 1 to less than 1 0x104 ohms 0 1 10K 2 10 Volts 1 0x104 to less than1 0x106 ohms 10K 1M 3 100Volts 1 0x106 to 2 0x1014 ohms 1M 200T c Electrification period i e the time period during which test voltage is applied to the material under test is automatically adjusted to the PRS 812 s measurement character...

Page 19: ... other b The display is continuously updated during the measurement s electrification period c The final displayed measurement is the averaged result of the last eight 8 individual consecutive measurements each within 5 at the end of the electrification period d If the material or test conditions vary such that eight consecutive measurements each within 5 of each other cannot be obtained the PRS 8...

Page 20: ... Be sure fresh batteries are installed when beginning an extensive measurement sequence Periodically check the condition of your batteries by pressing BATT TEST If Lo is indicated replace your batteries e When making resistance measurements at or below 10 ohms always perform The Low Range Calibration Procedure Repeat the procedure to confirm the instrument s response f During resistance measuremen...

Page 21: ... 812 to warm up for 3 minutes and perform the Low Resistance Calibration procedure If extensive measurements are being made periodically check the instrument s calibration by measuring the supplied calibration shunt C Operation in AUTOMATIC Modes The PRS 812 was designed to simplify measurement standards and general rules for making wide range resistance measurements The PRS 812 s AUTOMATIC mode c...

Page 22: ...ndustry standards 5 At completion of Test Cycle displays and HOLDS measurement test voltage order of magnitude LED analog scale multiplier and electrification time at end of period D Automatic Mode Procedures 1 Attach the desired test leads to the fixture electrodes or points to be measured 2 Slide the Battery Buss Cut Off to the ON position This connects the 9V batteries to the instrument s circu...

Page 23: ...is activates the Memory Register enabling data storage 6 Press the Green TEST button to begin the AUTOMATIC measurement sequence The instrument will automatically reset the resistance range to 0 1 Ohms 1 0E 01 and select 10 volts to be applied to the Positive Lead Terminal The electrification timer will start counting seconds Figure 9 PRS 812 Powered Up in AUTO Exponential Mode Right To change to ...

Page 24: ...ment is greater than 1 0x104 ohms test voltage will automatically be increased to 10 volts and the resistance range will be adjusted as necessary b A stable resistance measurement will be obtained within 2 0 to 4 0 seconds c Once a stable measurement is confirmed and displayed HOLD will be energized in the LCD and the electrification timer will stop d An LED corresponding to the measurement s orde...

Page 25: ...than 1 0x1012 ohms the test voltage will remain at 100 volts and the instrument will adjust the resistance range b The instrument s ELECTRIFICATION PERIOD is extended to a 15 seconds A stable resistance measurement will be obtained in approximately 15 0 to 20 0 seconds c Once a stable measurement is confirmed and displayed by the instrument HOLD will be displayed in the LCD and the electrification...

Page 26: ... To select MANUAL MODE press the MODE button until MANUAL appears in the LCD a Press the MODE button 2 times selects MANUAL Exponential display 1 0EXX b Pressing the MODE button three 3 times selects MANUAL display in Ohms 4 Set RESISTANCE RANGE SELECTION using the UP and DOWN arrow keys a Selects Range in one decade increments as indicated with colored LED s b For resistance ranges below E03 use ...

Page 27: ... the decade that the PRS 812 is set for OL Over Level will be displayed To move the selected resistance range up to a higher decade a Press RESET once this stops the Test Cycle but does not add OL to the Memory b Press MANUAL RESISTANCE RANGE SELECTION up arrow to select the desired decade the appropriate LED will illuminate indicating the current selection c Press TEST to restart the Test Cycle d...

Page 28: ...NUAL Mode Operations and assumes test leads are properly connected 1 Slide Battery Buss Cut Off switch to ON position 2 Press Red ON OFF button once to power up the instrument 3 Select AUTOMATIC MANUAL MODE by pressing the MODE select button until AUTO and MANUAL appear in the LCD display a Pressing the MODE button four 4 times selects AUTOMATIC MANUAL display in Exponential 1 0EXX b Pressing the ...

Page 29: ... maximum and average values by pressing the RECALL button 1 To Activate the Record Mode press the gray RECORD RECALL button once REC will be displayed in the lower left corner of the instrument s LCD display 2 To Turn the Recording Mode REC OFF perform the following sequence a With the unit ON press CLEAR b Then press the Red ON OFF button to turn the instrument OFF c Press the Red ON OFF button t...

Page 30: ... USA for service contact Prostat calibration customer service for a Return Material Authorization RMA tracking number by the following means See WARRANTY INFORMATION below for further instructions B General Handling Maintenance 1 Cleaning a Wipe case and LCD with clean low linting damp cloth b Do not use solvents for cleaning case or LCD Note When displayed OL Over Level indicates a measurement gr...

Page 31: ... THE FOREGOING EXPRESS WARRANTY IS MADE IN LIEU OF ALL OTHER PRODUCT WARRANTIES EXPRESS AND IMPLIED INCLUDING MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE WHICH ARE SPECIFICALLY DISCLAIMED The express warranty will not apply to defects or damage due to accidents neglect misuse alterations operator error or failure to properly maintain clean or repair products Limit of Liability in no event...

Page 32: ... to 1 0E 4 Ohms Constant Voltage 10 volts 0 2 volts 1 0E 4 to 1 0E 6 Ohms At 10 100 Volts 100 volts 2 0 volts 1 0E 6 to 2 0E 14 Ohms Manual Mode 0 01 to 10 volts Variable 1 0E 1 to 1 0E 4 Ohms 10 volts 0 2 volts 1 0E 3 to 1 0E 9 Ohms 100 volts 2 0 volts2 0E 5 to 2 0E 14 Ohms Accuracy Overall _ 5 at ambient conditions at 23o F and 30 Rh Specific Range Tolerances 1 0E 1 to 1 0E 1 ohms 5 Corrected fo...

Page 33: ...Current I 4ma 100 Volts PRS 812 Instrument Controls FUNCTION MODE Toggles Through Six 6 Operation Modes MODE DISPLAYED UNITS INDICATION RESIST RANGE TEST VOLTS TEST FUNCTIONS AUTOMATIC 1 1 0EXX IND T AUTO AUTO AUTO AUTOMATIC RESISTANCE RANGE TEST VOLTS ELECTRIFICATION DISPLAY HOLD AUTOMATIC 2 OHMS T AUTO AUTO AUTO SEE TABLE NOTE 1 MANUAL 1 1 0EXX IND T MANUAL MAN MAN or AUTO TEST ONLY NO DISPLAY H...

Page 34: ...angular button Arrows UP and DOWN Select Resistance Range Select Range in single decades in Manual and Automatic Manual modes Test Volts Manual Selection of 10 10 or 100 volts in Manual Mode Record Recall Turns Memory Register ON if OFF Provides access to all data in Memory Register Calculates and Displays Minimum Maximum and Average of data stored in Memory Register Clear Erases data in Memory Re...

Page 35: ......

Page 36: ...Copyright 2001 2009 Prostat Corporation Printed in U S A 1072 Tower Lane Bensenville IL 60106 USA www prostatcorp com ...

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