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RESISTOMAT

Model 2408

Page 84

Содержание RESISTOMAT 2408

Страница 1: ... co kg Talstraße 1 5 P O Box 1432 76593 Gernsbach 76587 Gernsbach Germany Germany Tel 49 07224 6450 Fax 49 07224 64588 E Mail info burster com www burster com 774 002408EN 5070 021513 2011 burster präzisionsmesstechnik gmbh co kg All rights reserved Valid from 18 02 2011 ...

Страница 2: ...rsterpraezisionsmesstechnik hereinafter referred to as product are the results of targeted development and meticulous research As of the date of delivery burster provides a warranty for the proper condition and functioning of these products covering material and production defects for the period specified in the warranty document accompanying the product However burster excludes guarantee or warra...

Страница 3: ... the declaration described above is in conformity with the requirements of the following documents Dokument Nr Titel Ausgabe Ausgabedatum Documents No Title Edition Date of issue 2006 95 EC Elektrische Betriebsmittel zur Verwendung innerhalb bestimmter Spannungsgrenzen 2006 Electrical Equipment designed for use within certain voltage limits 2004 108 EC Elektromagnetische Verträglichkeit 2004 Elect...

Страница 4: ...RESISTOMAT Model 2408 Page ...

Страница 5: ...OLTAGES 45 V ARE USED TAKE ALL MEASURE TO AVOID ACCIDENTAL CONTACT WITH ANY LIVE COMPONENTS USE MAXIMUM INSULATION AND MINIMIZE THE USE OF BARE CONDUCTORS WHEN USING THIS INSTRUMENT Use extreme caution when working with bare conductors or bus bars WHEN WORKING WITH HIGH VOLTAGES POST WARNING SIGNS AND KEEP UN REQUIRED PERSONNEL SAFETY AWAY CAUTION DO NOT APPLY ANY VOLTAGES OR CURRENT TO THE TERMIN...

Страница 6: ...RESISTOMAT Model 2408 Page ...

Страница 7: ...1 4 3 Power Requirements 27 1 4 4 Safety Inspection 29 Section 2 Operation 2 1 Terms and Conventions 31 2 2 Startup 31 2 3 Zeroing 32 2 4 Connection to Device Under Test 32 2 5 Measurement Procedure 34 2 5 1 General 34 2 5 2 Default Measurement Conditions 35 2 5 3 Automatic Measurement Mode 36 2 5 4 Manual Measurement Mode 38 2 6 Menu Functions 38 2 6 1 General 38 2 6 2 Setup Menu 39 2 6 2 1 Volta...

Страница 8: ... Calibration Date 59 2 6 4 9 Set Contrast 60 2 6 4 10 LCD Backlight 60 2 7 Input Output Interface 60 2 7 1 I O Interface 60 2 7 2 IEEE 488 2 Interface 62 2 7 3 Sample Program for IO Tech GPIB Card 68 2 7 4 RS232 Interface 69 2 7 5 Sample Program for RS232 70 2 7 6 Results to Printer 71 2 8 Error Messages 72 Section 3 Applications 3 1 Insulation Resistance Testing 75 3 2 Test Sample Resistivity Mea...

Страница 9: ...rchitecture 81 4 2 2 2408 Instrument Modules 82 4 2 3 Instrument Options 83 Section 5 Maintenance Calibration 5 1 Routine Maintenance 85 5 1 1 Battery Replacement 85 5 1 2 Resetting of Time and Date 85 5 1 3 Loss of Display Contrast 86 5 1 4 Preventive Maintenance 87 5 2 Calibration 88 5 2 1 General 88 5 2 2 Calibration Procedure 88 ...

Страница 10: ...RESISTOMAT Model 2408 Page 10 ...

Страница 11: ...ll scale current range in amperes Voltage Range 1 to 1000 V programmable in two ranges Voltage Accuracy 1 100 V 1 of setting 1 V 25mV resolution 100 1000 V 1 of setting 2 V 250 mV resolution Output Voltage Impedance 1 kΩ 5 Current Limited 2mA Current Measure 1x10 13 to 1x10 3 amps Current Accuracy 1nA to 1mA 0 5 0 0005 FS 2 pA 100pA to 1nA 1 0 0005 FS 2 pA 1pA to 100pA 10 0 0005 FS 2 pA Input Impe...

Страница 12: ... 133 4mm high x 444 5mm wide x 406 4mm deep Weight Approximately 8 2 kg Net Approximately 11 8 kg Shipping Environmental MIL T 28800D Type 3 Class 5 Style E F Operating 0 C to 50 C stated accuracy 45 RH Storage 40 C to 71 C Altitude 2000m Installation Category 1 Pollution Degree 1 Power 90 250 V 47 63 Hz 40 W max General Fully programmable via menu Zeroing Stored test conditions and results Select...

Страница 13: ...Model 2408 RESISTOMAT Page 13 Accessories ...

Страница 14: ...RESISTOMAT Model 2408 Page 14 ...

Страница 15: ...lips when the high voltage is applied and the red CAUTION HIGH VOLTAGE LED is lit 5 Before turning on the 2408 unit make sure the AC power cord is plugged into the proper voltage source and that there is no device DUT or fixture connected to the test leads 6 After each test press the STOP red button for safety This terminates the high voltage being applied to the output terminals 7 When the CAUTIO...

Страница 16: ...n cause hazard to human if the warning is neglected Caution Avoid product misuse It may cause damage to the product itself and the DUT if the caution is neglected Note Important information or tips for the procedures and applications Warning Signal During Testing DANGER HIGH VOLTAGE TEST IN PROGRESS UNAUTHORIZED PERSONS KEEP AWAY Disposal Do not dispose of electrical appliances as unsorted municip...

Страница 17: ...est DUT is program mable from 1 to 1000 V A pass fail indicator provides a visual display of test results based on a preset limit A set of power up default test conditions are stored in the unit and are as set by the factory 1V test times zero until reprogrammed by the user Start up The 2408 can be operated from a power source between 90 V and 250 Vac at a power line frequency of 47 to 63 Hz The s...

Страница 18: ... phases charge dwell measure and discharge and a pre stored set of test conditions are executed These test conditions can be DEFAULT those at power up set using menus or the operator can recall a previously stored setup 1 Connect the device under test to the 2408 test leads or other fixture being used 2 If the desired setup conditions are anything other than DEFAULT set using menus or proceed to R...

Страница 19: ...T to apply high voltage to the device The High Voltage Indicator will remain on as long as a voltage is applied The measurement can be aborted at any time during the test cycle by pressing STOP 9 Initiate a single measurement by pressing START again The measured result will be displayed on the LCD and will be updated each time START is pressed 10 To discharge the device press STOP 11 Before removi...

Страница 20: ...ame up to 8 characters under which these set of test conditions will be stored Press ENTER key to finalize storage of the setup conditions or if DEFAULT is selected one must answer Y or N to overwrite Changing Test Voltage 1 Set the desired test voltage Press MENU key to select menu display Press Right or Left Arrow key to select Setup menu Press Up or Down Arrow key to select Voltage Press ENTER ...

Страница 21: ...ange displayed measurement results between Resistance Current or Pass Fail Press MENU key to select menu display Press Right or Left Arrow key to select I O Menu Press Up or Down Arrow key to select Display Press ENTER key to activate the selection field Press Up or Down Arrow key to select desired measurement results Resistance Current or Pass Fail if a limit is to be used Press ENTER key to fina...

Страница 22: ...RESISTOMAT Model 2408 Page 22 ...

Страница 23: ... for measurements on capacitors transformers switches cables and connectors The 2408 provides a direct readout of resistance from 1000 Ω to 100 TΩ with fully automatic ranging The voltage applied to the unknown is programmable from 1 V to 1000 V The 2408 includes a high resolution graphics display and keypad for ease of use The test cycle is fully automatic with programmable charge dwell measure a...

Страница 24: ...or Guard Input to Chassis GND 1b Red Sheathed Banana Plug High Voltage Terminal for connection to DUT 1c Black Sheathed Banana Plug Low Voltage Terminal for connection to DUT 1d GUARD Blue Sheathed Ba nana Plug Guard Terminal for 3 Lead Guarded Mea surements 2 Display LCD Graphic Displays measurement results instrument status and user interface menus 3 SELECT 4 Gray Push Buttons Function as indica...

Страница 25: ...USB USB connection To store test setup conditions and measure ment results on a flash drive 11 STOP Red Push Button To stop the measurement terminate high voltage at the output terminals 12 TEST Indicate P F Measurement Result based on preset limit 12a FAIL Red LED When lit in Resistance Mode the measured value is below the set minimum value resis tance limit When lit in Current Mode the measured ...

Страница 26: ... Vent Rear Panel Portion Instrument ventilation 3 I O Port 36 pin Male Amp 552302 1 com patible 36 Pin Connector for Component Handler Use with Amp 552302 1 plug 552073 5 strain relief cover or ribbon cable clamp con nector 553600 1 or equivalent s 4 Parallel Port Not Available Not Available 5 Option 2408 03 Rear Panel Input Terminals Ground and Guard for connection to DUT with High Voltage Indica...

Страница 27: ... that for bench operation the front bail should always be used to angle the instrument up and for rack installation it should be mounted at eye level or higher 1 4 3 Power Requirements The 2408 Megohmmeter can be operated from a power source between 90 and 250Vac at a power line frequency of 47 to 63Hz Power connection to the rear panel is through an AC inlet module comprised of an ac connector an...

Страница 28: ...the small tab to pull the drawer outward If you wish to remove the drawer from the ac inlet module not required in order to change the fuse press the sides inward at the rear of the drawer and pull the drawer out 2 Remove the fuse from the drawer by prying upward using a small flat head screwdriver 3 Insert the replacement fuse 4 Optional Insert a spare fuse in the front section of the drawer 5 Sl...

Страница 29: ...tion to earth ground When the 2408 instrument is used in a rack installation using the 2408 Z001 Rack Mount Kit make sure the unit is secured using the cabinet mounting rails and not secured solely by the front panel angle brackets In bench or rack mount applications the instrument should be positioned with consideration for ample air flow to the rear panel ventilation holes An open space of at le...

Страница 30: ...RESISTOMAT Model 2408 Page 30 ...

Страница 31: ...y with no changes made From a numeric data field CNCL must be hit twice 2 2 Startup Check to make sure the line voltage indicator on the rear panel AC inlet module agrees with the AC power source available if not refer to paragraph 1 5 3 Connect the instrument power cord to the source of proper voltage The instrument must be used only with three wire grounded outlets WARNING A flashing CAUTION HIG...

Страница 32: ...ctions are given on the LCD display Refer to paragraph 2 6 4 3 2 4 Connection to Device Under Test Figure 2 1 illustrates the front panel input terminals and a basic block diagram of their function Figure 2 1 Input Panel and Block Diagram An optional shielded lead set is available for use with the 2408 unit Part Number 2408 Z002 How the connection to the DUT is made depends on the unknown being me...

Страница 33: ...er than through the lead set provided Figure 2 2 Two Wire Ungrounded Connection The two wire grounded measurement is a common type of connection to be used on the 2408 This is the recommended connection on grounded components or components that are some physical distance from the input terminals of the unit A grounded component is one in which one of its connections goes to an earth ground whereas...

Страница 34: ... In the automatic mode the test cycle is sequenced automatically through four phases Charge Dwell Mea sure and Discharge in accordance with user programmed times This is the preferred measurement mode especially when the approximate resistance value is unknown since the 2408 instrument employs an auto ranging technique The automatic mode would gen erally be used in a production environment where m...

Страница 35: ...e the factory default settings 2 5 2 Default Measurement Conditions A set of default measurement conditions are initially established at the factory and stored in instrument memory Default conditions are those that determine the instruments status on power up thus the instrument is always set to a known state before any testing begins These conditions can be changed by the user for tailoring to a ...

Страница 36: ...ined by either the power up default condi tions or by recalling a previously stored setup from instrument memory In either case a test cycle is sequenced automatically Figure 2 5 once START is pressed and results dis played Figure 2 6 When a test limit is entered a PASS FAIL indication can be displayed in place of the actual measured value Figure 2 7 Figure 2 5 Test Cycle Sequence Automatic ...

Страница 37: ...Model 2408 RESISTOMAT Page 37 Figure 2 6 Measurement Results Display with Value Figure 2 7 PASS FAIL Results Display ...

Страница 38: ...e times are not applicable Figure 2 8 Test Cycle Sequence Manual 2 6 Menu Functions 2 6 1 General All programmable functions of the 2408 are controlled by easy to use menu displays The user enters the menu mode by selecting the MENU key which calls up three top level menus Setup I O and Utilities Each one of these is comprised of a sub menu list whose functions are described in detail below Naviga...

Страница 39: ... to the unit under test during the test cycle and present at the DUT connection anytime that the CAUTION HIGH VOLTAGE lamp is ON As in the case of many of the menu entries on the 2408 instrument an error message will be displayed for an invalid entry Setup I O Utilities Voltage 1000 Charge Time 0 Dwell Time 0 Measure Time 0 Discharge Time 0 Mode Auto Manual Range Limit 100 e 9 Stop on Pass 0 to Av...

Страница 40: ...r low voltage measurements 5 V a minimum charge time of 2 seconds is recommended to meet the instruments stated accuracy 2 6 2 3 Dwell Time Accepts entry of a dwell time or electrification time between 0 and 300 seconds in 1 second intervals This is a time during which the test voltage is applied to the device under test and prior to any measurement 2 6 2 4 Measure Time Accepts entry of a measure ...

Страница 41: ...est cycle automatically The first pha se of the cycle is charge time during which the device initially charges up to the applied test voltage The second phase is dwell or time of electrification during which the device is fully charged but prior to a measurement The third phase is measure time during which measured results are displayed The fourth and last phase is discharge time during which the ...

Страница 42: ...s when repetitive measurements are to be made on a known range and there is a desire to reduce test time by eliminating range switching When auto ranging is selected the 2408 instrument will always begin the mea surement phase on the highest current range 1 mA and progress down depending on the current to the device under test If the current reaches 10 or less of the maximum for a given range the ...

Страница 43: ...culate the unknown resistance the input resistance of the instrument 5 kΩ must be taken into consideration For further discussion of this refer to Display Type in Paragraph 2 6 3 1 The measurement range capability is represented graphically in Figure 2 14 By locating the charge voltage on the vertical axis and the measured resistance or expected mea sured resistance on the horizontal axis one can ...

Страница 44: ...RESISTOMAT Model 2408 Page 44 Measurement Ranges at Specified Voltage Resistance in Ohms Figure 2 14 Measurement Range Capability C h a r g e V o l t a g e 1 kΩ 1 MΩ 1 GΩ 1 TΩ ...

Страница 45: ...elow the limit will result in a Fail The opposite is true when the unit is in the current mode the limit is a maximum value any value below the limit will result in a Pass and a value above the limit will result in a Fail If the display parameter on the I O Menu is selected as resistance the value entered will be an R limit if the display is selected as current the value entered will be an I limit...

Страница 46: ...ed The sixth measurement is averaged with the last four and the first ignored this continues until the user specified measurement time is complete When Stop on Pass is in effect n measurements are made and averaged If the Stop on Pass requirement is met the cycle stops with a Pass even though the measure time has not passed If the measure time has passed and the Stop on Pass requirement has not be...

Страница 47: ...splay Resistance Current Pass Fail or No Display In Resistance mode the 2408 instrument will display the mea sured value of resistance of the device under test In Current mode the 2408 displays the current to the device under test In Pass Fail mode the actual measured value is displayed in small font along with a Pass or Fail based on the measurement limit entered which could apply to either resis...

Страница 48: ...tific units are expressed as an exponent and engineering units are expressed in ohms for resistance and amps for current For example e6 in scientific units can be expressed as MΩ or as µA in engineering units This is strictly for the user s convenience When Sci is selected the results will always be displayed as 5 digits and an exponent The 5 digits will be configured as 1 to the left and 4 to the...

Страница 49: ...10 3 milli m 000001 10 6 micro µ 000000001 10 9 nano n 000000000001 10 12 pico p 000000000000001 10 15 femto f 2 6 3 3 RS 232 Figure 2 19 RS 232 Interface Setup Allows user setup of standard RS 232 interface formats Selections include Baud Rate 12 24 48 or 96 Parity None Even or Odd Data Bits 7 or 8 Stop Bits 1 or 2 When using the RS 232 interface with a printer the IEEE 488 2 Mode must be set to ...

Страница 50: ...hake routine assures that the active talker proceeds slowly enough for the slowest listener 2 6 3 5 Handler Allows user to turn Handler Interface function ON or OFF When off is selected input and output lines on the rear panel I O interface connector are ignored 2 6 3 6 Saving Measurement Results via USB The user can store measurement results on a USB flash drive When selected if a results file is...

Страница 51: ... 65R The test setup conditions are saved as a header at the beginning of a results file A sample file format is shown below Notice that the results can be stored in either engineer ing or scientific terms depending on what the user has selected for setup conditions 100 000000 voltage 0 000000 charge time 0 000000 dwell time 0 000000 measure time 0 000000 discharge time 0 000000 mode 0 auto 1 manua...

Страница 52: ...S 1 020015E 006 PASS 1 020015E 006 PASS 2 6 4 Utilities Menus Figure 2 21 Utilities Menu The last of the three main menus is Utilities shown in Figure 2 21 Each function is descri bed in detail in paragraphs 2 6 4 1 through 2 6 4 10 Setup I 0 Utilities Display Type Save Setup Recall Setup Zero Lock Out Calibration Set Time Date Elapsed Time Calibration Date Set Contrast LCD Backlite Off On ...

Страница 53: ... 2408 s internal memory a flash drive must be plugged into the USB port To store the current set of test conditions as a new set in unit memory you need to select NEW in the Save Setup menu and enter the identifying name up to 8 characters under which these conditions will be stored allowable characters from the keypad include 0 through 9 and minus characters can also include A through Z when oper...

Страница 54: ...etups than can fit on the display the page down key is active If there is less than a whole page below the display wraps around to the previous display Continu ing to page down will eventually return to the first display of setups The page down key is only shown when there are more setups than what is visible There are two ways to make the current set of test conditions overwrite an existing setup...

Страница 55: ...etup Figure 2 25 Recall Setup Test Conditions Allows a previously stored set of test conditions to be recalled from instrument memory Test conditions are those that are user programmable in the Setup and I O menus and sa ved as discussed above To recall a set of test conditions one needs to arrow down or up to the desired set DEFAULT is always one of the set of test conditions that can be recalled...

Страница 56: ...on to the DUT is changed Zeroing should also be performed anytime the test voltage is changed which also includes recal ling a set of test conditions from memory with a different test voltage It is important to note that anytime the instrument is zeroed it is done at the test voltage currently specified When Zero is selected in the menu screen and the Enter key is pressed you are promp ted by inst...

Страница 57: ...ed and entered again for verification testing can begin by pressing START or the password cleared or changed by selecting MENU HIT MENU KEY TO ENTER PASSWORD AND TO RETURN TO THE MENU OR HIT THE START KEY TO START A MEASUREMENT Once activated only the START STOP and MENU on the instrument front panel are active all other keys are disabled To turn the lockout feature off and reactivate menus select...

Страница 58: ... counter and stored calibration date T time is entered in HOURS up to 2 digits 0 through 23 MINUTES up to 2 digits 0 through 59 SECONDS up to 2 digits 0 through 59 D date is entered in MONTHS up to 2 digits 1 through 12 DAYS up to 2 digits 1 through 31 YEARS 4 digits 1991 through 2100 Tue Jan 14 10 37 10 2011 TO CHANGE TIME PRESS T KEY TO CHANGE DATE PRESS D KEY TO RETURN PRESS MENU T D ...

Страница 59: ...tory Figure 2 29 Display of Elapsed Time 2 6 4 8 Calibration Date When selected indicates date the unit was last calibrated This date is retained in instru ment memory until the unit is re calibrated and then it is updated Figure 2 30 Display of Calibration Date THE TOTAL OPERATING TIME FOR THIS INSTRUMENT IS 1205 50 hours HIT MENU KEY TO CONTINUE THIS INSTRUMENT WAS CALIBRATED ON 01 14 2011 AT 11...

Страница 60: ...F Turning the backlight off when it is not needed or if the display is not in use Keeping the backlight off prolongs the life of the display 2 7 Input Output Interface 2 7 1 I O Interface The 2408 instrument comes standard with an I O interface port available through a con nector 36 pin on the rear panel of the instrument This is generally used for interfacing to an automatic component handler Ref...

Страница 61: ...r Safety feature primarily for use with external fixtures i e operation of the 2408 instrument can be disabled until the cover of the fixture is closed To enable the interlock function pin 31 must be connected to ground or controlled electrically with a logic low This can be converted to an isolated active low input by removing jumper JP4 on the I O PCB The interlock connector supplied with the un...

Страница 62: ...ter currents can damage the instrument Pin 34 is connected to the input of the optical isolator through a 620 Ω current limiting resistor Pin 35 is connected to the side of the optical isolator Recommended force cur rent through this circuit should be between 1 and 5 mA nominal 10 mA max Figure 2 33 Isolated Connection 2 7 2 IEEE 488 2 Interface The IEEE 488 2 interface is available as an option t...

Страница 63: ...n quiescent state SRQ 10 Service Request Low state a talker or listener signals to the controller need for attention in the midst of the current sequence of events REN 17 Remote Enable Low state enables each device to enter remote mode when addressed to listen High state all devices revert to local control EOI 5 End of Identify if ATN is in high state then low state of EOI indicates end of a multi...

Страница 64: ...well time to value 000 TMEasure value Set the measure time to value 000 TDIScharge value Set the discharge time to value 000 MODE Set the mode to A Auto M Manual CAUTION When using Manual MODE via the RS232 interface a delay time must be inserted between the issuing of the Start command and the sending of the Fetch command This delay time must be sufficient to ensure that the 2408 has displayed a ...

Страница 65: ...quence is as follows terminated with a line feed N NNNNE NNN 2 spaces PASS The plus sign will be negative when the parameter is selected as current Pass can also be Fail or neither if no limit is entered IDN Returns instrument identification burster 2408 0 software version START Initiates a measurement in Auto mode in Manual mode it initiates charge if sent again it takes one measurement each time...

Страница 66: ... 20 The open circuit correction for range 6 21 The open circuit correction for range 7 Command Function Parameters RST Reset This command performs a device reset CLS Clear Status This command clears status data structures ESR Event Status Register Sends the event status register information This is a destructive read STB Status Byte Register Sends user the status byte register information ESE Even...

Страница 67: ...Model 2408 RESISTOMAT Page 67 ...

Страница 68: ...any identification is id INPUT 2 id PRINT Instrument identification is id INPUT 2 id PRINT Serial number is id INPUT 2 id PRINT Software revision is id PRINT 1 output 04 syst Dcal PRINT 1 enter 04 INPUT 2 c PRINT This unit was calibrated on c PRINT 1 output 04 conf volt 100 PRINT 1 output 04 conf lim 9 97e5 PRINT 1 output 04 conf disp r PRINT 1 spoll an error will produce a SRQ INPUT 2 y IF y THEN...

Страница 69: ...rt requires five lines receive data transmit data data terminal ready data set ready and signal ground With some controllers additional signals maybe required and are listed in Table 2 6 Refer to Figure 2 34 for null modem cable configuration to the standard db9 or db25 connector Refer to Table 2 5 for the command set which also applies to the RS232 interface When using the RS 232 interface with a...

Страница 70: ... Connect to 2 3 6 7 20 Transmit data Receive data Data set ready Signal ground Data terminal ready Figure 2 34 RS 232 Cable Configurations 2 7 5 Sample Program for RS 232 OPEN com1 9600 n 8 1 rs FOR RANDOM AS 2 some com ports require this ie rs OPEN com2 9600 n 8 1 FOR RANDOM AS 2 others run best without rs PRINT 2 system lock 1 PRINT 2 idn get unit identification GOSUB cget read serial data subro...

Страница 71: ...en get the rest of the string y x LOC 2 DO WHILE x y y x FOR j 1 TO 300 NEXT j x LOC 2 LOOP RETURN 2 7 6 Results to Printer The 2408 can be setup to output to an RS 232 or IEEE printer Results format is the same as results to USB refer to paragraph 2 6 3 6 RS 232 RS 232 must be selected on I O Menus and format set IEEE must also be selected for Talk mode and Disable state IEEE IEEE must be selecte...

Страница 72: ...C ERROR ON USB Stored setup lost or corrupt cyclic redundancy check PROTECT ERROR Flash drive is write protected ELAPSED TIME ERROR SET TO 0 Elapsed time is incorrect and has been set to zero battery for non volatile memory may be defective or has been disconnected FAILURE SEE DOCUMENTATION Hardware or software failure 1 99 list not included in this manual FILE ACCESS VIOLATION File selected from ...

Страница 73: ...ower up REBOOT LIMIT INVALID SET TO NONE No limit is accepted out of range or invalid LOW BATTERY VOLTAGE Memory backup battery low voltage setups and instrument zero could be lost MAXIMUM OF SETUPS REACHED Maximum number of files have been stored NO CALIBRATION DATA FOUND Calibration required refer to Paragraph 5 4 NO IEEE 488 2 INTERFACE Unit does not include IEEE 488 2 Option NO INTERLOCK SIGNA...

Страница 74: ...fix is incorrect for example to configure unit use CONFigure SHUT THE POWER OFF Malfunction of high voltage source TIME DATE ERROR PLEASE SET Reset time and date UNABLE TO READ FROM USB Flash drive is either not connected or defective UNABLE TO READ THAT FILENAME Selected file unreadable improper format UNABLE TO SAVE CALIBRATION DATA Repeat calibration data not stored UNABLE TO WRITE TO USB Flash...

Страница 75: ...terial with low insulation resistance might not breakdown during a voltage test Factors that affect insulation resistance measurements include such things as temperature humidity previousconditioning testvoltage chargingcurrentanddurationofthetestvoltage electrification time It is characteristic of certain components for example capacitors or capacitive components or materials for the current to f...

Страница 76: ... used for measuring the resistivity of test samples as described by ASTM Standard D 257 which describes in detail the techniques for both surface and volume resistivity measurements The 2408 Z006 Test Cell is shown in Figure 3 1 Figure 3 1 2408 Z006 Surface Volume Plate Test Sample Cell ...

Страница 77: ...entage of low frequency noise ripple Measurements on pure resistive elements will tolerate a high degree of ripple due to the voltage ratio measurements whereas a capacitor easily passes the noise ripple When this is amplified by the current amplifier of the measuring instrument results can fluctuate and vary widely To eliminate this in the 2408 two resistance adapters are supplied which can be pl...

Страница 78: ... of 250 kΩ the charge time will be increased by a factor of 0 4 and 4 respectively 3 3 3 Discharge Time The time constant for discharging a capacitor in the discharge phase is determined by the value of the capacitor times the resistance of the 2408 discharge circuit The discharge resistance is approximately 66 kΩ The CAUTION HIGH VOLTAGE lamp is turned off after the user specified discharge time ...

Страница 79: ... the 2408 where the instrument basic accuracy of 0 5 is adequate For single component resistors a two terminal connection UNKNOWN and UNKNOWN is recommended 3 5 Measurement of Voltage Coefficient The 2408 instrument may be used to measure voltage coefficient which is defined as R1 R2 x 100 R2 V1 V2 where V1 V2 R1 is the resistance at V1 the higher voltage R2 is the resistance at V2 For example if ...

Страница 80: ...ard RA is placed across the voltage source and has no effect if it is greater than 1 25 MΩ As long as RB is greater than RS standard range resistor the error caused by RB is minimized thus if there is a choice its better to have the higher of the two stray resistances connected to RB Figure 3 2 Guarded Measurement Configuration The guard terminal can be used whether GUARD or the UNKNOWN terminal i...

Страница 81: ...t software in an electronic chip disk The RS232 port is connected to its rear panel connector by a cable The processor board is stacked on the Digital I O Board which is mounted on the Analog Instrument board The processor board can have an optional IEEE 488 2 board stacked on it Digital I O Board The digital I O board provides interfaces to the LCD display the keypad and provides handler interfac...

Страница 82: ...ibration information This is the main board in the instrument compartment to the left of the power supply modules All other boards are mounted to it A brief description of the operation of the measurement detector is as follows Figure 4 1 shows the basic block diagram for the measurement module A programmable high voltage 0 1000V is applied to the unknown component Rx The current flowing through t...

Страница 83: ...and allows complete control over all aspects of the instrument Any user control available through the keyboard or any information available for display can be accessed over this interface This board is mounted towards the right rear of the unit stacked above the processor board Connection to the IEEE 488 2 connector on the rear panel is made by an interconnecting cable USB Port A USB port is inclu...

Страница 84: ...RESISTOMAT Model 2408 Page 84 ...

Страница 85: ...ility for in strument damage resulting from the batteries not being changed as recommended To replace the batteries refer to figure 5 1 and proceed as follows 1 Turn the instrument on and make sure it is not in measurement mode CAUTION If the batteries are removed with the power off there would be no power to the non volatile memory and important data such as stored test conditions would be lost 2...

Страница 86: ...nd the instrument zeroed before proceeding with any measurements Proceed as follows 1 Press MENU key to select menu display 2 Press Right or Left Arrow key to select Utilities menu 3 Press Up or Down Arrow key to select Set Time Date 4 Press ENTER key to activate the entry field 5 Set the current time and date as instructed on the display refer to paragraph 2 6 4 6 if necessary After the time and ...

Страница 87: ...and wait 20 seconds or after High Voltage light flashes 3 Press MENU key twice 4 Press SELECT 4 one time 5 Press SELECT 1 two times 6 Press ENTER 7 Press SELECT 1 many times till contrast returns to normal 8 Press ENTER 9 Arrow up to SAVE SETUP and save as DEFAULT If the above procedure fails to restore the contrast try repeating again Failing restoration of the contrast may be indication of anoth...

Страница 88: ...eable to NIST 1 MΩ standard resistor of known value within 0 01 at 100V for direct connection to 2408 input terminals traceable to SI 5 2 2 Calibration Procedure The step by step instructions for this procedure are shown on the instrument display and discussed below 1 First set time and date by selecting SET TIME DATE on the Utilities menu 2 Select CALIBRATION on the Utilities menu Once ENTER is s...

Страница 89: ...ted and press START 3 Enter the precise known value of the 1 MΩ standard and again press ENTER 4 Remove the short and connect the standard between the and terminals 5 When START is pressed a calibration measurement is made on the standard which takes approximately 25 seconds 6 Once the standard is removed and START pressed again a RANGE CALIBRATION is performed which takes approximately 45 seconds...

Страница 90: ...RESISTOMAT Model 2408 Page 90 ...

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