QST 2002– HF User`s Manual Integral Solutions Int`l - us
Contents
1. QST 2002 HF User s Manual Integral Solutions Int l March 31 2010 Copyright 2003 2010 Integral Solutions Int l All rights reserved Integral Solutions Int l 3000 Olcott St Santa Clara CA 95054 Phone 408 653 0300 Web http www us isi com Fax 408 653 0309 E mail 1si us isi com While every effort has been made to verify the accuracy of the information contained in this publication this publication may contain technical and or typographical errors Please contact Integral Solutions Int to report any errors in this publication Contents Introduction 3 2 Related Documentation 3 3 System Components and Physical Characteristics 4 4 Interlock System Components and Power On Operation 5 4 1 Main Power Switch 6 4 2 EMO Button 6 4 3 Cover Door Switches 7 4 4 Service Key 8 4 5 Interlock System Testing Procedure 8 4 6 Normal Operation and Power On 8 5 Mechanical alignment and operation 9 5 1 Adjustment of Locked Unlocked Position Hard Stops 9 5 2 Changing Orientation of the Magnet Core Field 10 5 3 ISI Pole Spacer 1 5 4 Magnet Pole Adjustment 12 6 Software tests and operation 14 6 1 High Field Transfer test 14 6 2 High Field Parameters Menu 15 6 3 Closed Loop gain and Magnetic Field Calibration 16 7 Quasi97 17 8 Toolings 18 8 1 Hall Effect Cartridge 18 8 2 HGA Tooling 18 8 3 ESD Module HBM MM and CDM 18 8 4 HSA and HDA Toolings 19 8 5 1x Hotfinger HGA Temperature Stress System 19 9 Specifications 20 Ap2. 5 L x 60 H weight 500 Ibs During normal operation the tester monitor can be rotated and add as much as 4 on the right side of the tester and if lifted 4 in height On the ergonomic model the width of the tester extends by up to 16 on the left side and 10 to the front of the tester Maintenance may require access from the front back or the two sides of the tester Front and rear door can add 25 5 in the length of the tester when opened However both may be taken off using 2 clearance Side Panels can be removed using 2 clearance on the two sides When installing the tester consider that it can be wheeled out from the production line for access on all four sides For electrical troubleshooting allow 36 out by 30 wide space around the tester per electrical codes 4 Interlock System Components and Power On Operation The QST 2002HF unit is equipped with an interlock system which consists of an optional protective Cover and a set of Interlock components The control circuitry and many of the actual Interlock components of this system are enclosed in the Interlock Box mounted to the left hand panel inside the lower frame The QST 2002HF systems with this equipment can be identified by the EMO mushroom switch on the upper frame panel as shown in the picture below The Interlock System Components are shown below Switch to power off the tester This will be called an EMO event Reset Button Reset Button which must be pr
3. if the user decides to run the system with Cover Doors opened This mode is called Service Mode When the key is in vertical position or removed the tester 1s operating in normal mode and the Door Cover Switches are working normally To enter Service Mode turn the Service Key clockwise to horizontal position A Warning If the Service Key is turned to Service Mode the Cover Door Switches will be disabled 4 5 Interlock System Testing Procedure The following is a procedure to confirm all Interlock System components 1 Turn OFF the Main Power Switch The power to all components should turn off fans should stop working and the LED on Interlock Box should turn off 2 Turn ON the Main Power Switch The LED on the Interlock Box should turn on but power should not be restored to the rest of the components of the system 3 Push the Reset Button The power should be restored to most of the system components QPS 1050 and QST 2002E may stay off 1f a Cover Door 1s open 4 Turn on the PC then press the EMO Button The power to all components except the PC and monitor optionally should shut off 5 Twist the EMO button clockwise until it clicks out The power should not come on 6 Pushthe Reset Button The power should be restored to most components 7 Make sure that the Service Key is in vertical position and close the Cover Doors The QPS 1050 and QST 2002E should turn on 8 Open the Left Cover Door The QPS 1050 and QST 2002E
4. sensor will be placed exactly in the middle of the magnet gap Open calibration menu and press Calibrate Magnetic Field button In the window prompt entered the magnetic field measured by the Omega Gauss Meter and press OK After performing the above press Save to EEPROM button Ax Quasi97 4 3 35 SETUP lt C Program FilessIntegral Solutions Int l Quasi 97 Hf test mds gt LOG lt gt EN j a x File View System Tools Calibrate Add Ins Diagnostics Help Transverse Quasi Static Tests 1 A Static Tests 1 sf Sweep Test Production Calibration Menu Reader Resistance Aux Resistance Voice Co Read Bias Aux Bias Write Current Calibrate One op i 2941 Low D 99828 0017 4425 High U 0 8953 0 0067 6097 E z Calibrate All li i 1957 High Up Calibrate All Channels Bias Calibrate Selected Channel Bias Apply Cell to Column Automatic Input Fine Tune Offset Calibrate Amb Temperature Enter Amb Temp C 28 Cal Factor fo Calibrate Magnetic Fielc Gain 2295 5 Offset 45 5 Calibrate ADC Offsets Offs A1 01 804 Offs B2 0523 Zalibrate zT Capacitance Cal Factor 1 Cal Factor 2 Cal Factor 3 Hl Calibrate 2xBar Gen3 Save to EEPROM Close Abort Test START Run Test Head tt o a 0 0 00 Haofo 1000 Note The Gauss meter tool is recommended for periodic verification and if necessary
5. should turn off Close it and repeat with the Right Cover Door 9 Open either or both of the Cover Doors and confirm the QPS 1050 and QST 2002E are off Turn the Service Key to horizontal position The QPS and QST should turn on again 10 Return all Interlocks to normal operation 4 6 Normal Operation and Power On For normal tester operation the following conditions must be met e The EMO switch must be un pressed e The Service Mode Key must be turned to vertical position and removed from the lock e The front and rear lower frame doors must be closed and locked 8 e If equipped with a Cover the top Cover Doors must be closed To power ON the system the user must perform the following 1 Verify the above normal conditions are met 2 Unlock and open the front lower frame door 3 Engage the Main Power Switch on the front panel 4 Press the Reset Button 5 Close and lock the front lower frame door N Warning The system must only be powered ON if all Interlocks are in good working order 5 Mechanical alignment and operation 5 1 Adjustment of Locked Unlocked Position Hard Stops The Locked and Unlocked Position Hard stops can be adjusted by moving the hard stop along the channel in the base plate There are fixed limits at each end of the channel preventing the user from accidentally moving the Carriage off of the slide assembly The Unlocked Position Hard stop does not require fine adjustment Proper adjustment i
6. with the High Field Magnet 14 6 2 High Field Parameters Menu w High Field Parameters iH x Add Magnet Angle value as Lot ID Degauss Magnet Deaguss Peak Field 500 Calibrate Field Sensor Calibrate Magnet Angle Seve TEL e e rally Show High Field Magnet Position Dial 0 Show Diagnostics High Field Parameters Menu High Field Parameters window can be used by the user to specify certain operational options Add Magnet Angle value as Lot ID will display and log the magnet angle into Lot ID field of a test see picture below Show Magnet Angle form on Startup will display High Field Magnet Position Dial window each time Quasi 97 is entered Degauss Magnet will set positive and negative field according to peak field followed by setting smaller positive and negative fields for the purpose of degaussing the High Field Magnet Calibrate Field Sensor calibrates the closed loop circuit necessary only after modifying Magnet Pole type and or gap Calibrate Magnet cable calibrates the digitized reading on the Magnet Angle Save to EEPROM should be pressed after either of the above calibrations is performed Show High Field Magnet Position Dial displays Magnet Angle Dial window Show Diagnostics will prompt for password to enter diagnostic options The table on the right side shows the contents of the High Field Interconnect board EEPR
7. 0 2 and 0 85 standard adjustable Magnet Response Time 20ms steps up to 50 Oe Stray Magnetic Field at 6 radius from Magnet housing 0 2 Pole Gap lt 5 Oe 0 85 Pole Gap lt 10 Oe Thermal and Over current Protection Physical Specifications Footprint WxDxH 27 W x 26 5 D x 60 H VOID D anssexestureso i suuoe iain 500 Ibs POW Cl c orentostep Tint PTS 1 15VAC 4 996 50 60Hz Single Phase 8A peak current 5A RMS current LV RR No air or vacuum connections required 20 DC Read Channel All Measurements have 14 bit accuracy Bias Current Fo nteesces e pap tado E RPUR PDA EUIS 10 uA PAM UNG casa ignsasabinaswscaiousscotianecssaiadans 10 uV Resistance 1V IR 1V 2 Resistance 3V IR 3V 4 9o PSV MICU r 1 5 Pk Pk FLY SICEOSIS E ETS lt 1 5 Pk Pk UC T ES lt 5 uV RMS Max Voltage Range across MR 3V Max Amplitude Range 30 000 u V Amplitude Resolution 1 22 u V AC Read Channel Analog Bandwidth 200 MHz Ig inis T 0 5 dB Digitizer Bandwidth sss 160 Mhz Digitizer Resolution 2 coiere 10 Bit PPM py 1O 0S Tr 2 Pr SVG Soon E Low Pass or Band Pass Write Read Delay Gates Gsscacecestecetmaesinces 0 1 50000 uS Gates Resolution 2 6er retirada 0 1 uS Gates ACCUEIL osser s
8. E E a a I eee eee A p uv o SN _ o TA 9 ow o DISTANCE FROM CENTERLINE f OF POLES Oe VIEASURED FIELD THIS VALUE IS CONSTANT ALONG THE PERIMITER OF THE CIRCLES 26 0 85 Spaced Flat Poles Measured at Plane 2 Above Gap Centerline O COLO A j i m Nu so oe e p 8j c oA 9 cw o DISTANCE FROM CENTERLINE J OF POLES Oe m MEASURED FIELD THIS VALUE IS CONSTANT ALONG THE PERIMITER OF THE CIRCLES 27 0 85 Spaced Flat Poles Measured at Plane 3 Below Gap Centerline D 8j v A rv 19e CONEL ORE L 2 NNI S oA 9 o DISTANCE FROM CENTERLINE f OF POLES Oe SENE VIEASURED FIELD THIS VALUE IS CONSTANT ALONG THE PERIMITER OF THE CIRCLES 28
9. F 4 2 EMO Button The EMO button located on the right front side of the top frame allows the operator to quickly disconnect the power to all components except optionally for the PC therefore removing any hazardous energy from the system The EMO switch is open and accessible at any time and is activated by pressing the button IN Once pressed it will remain in a powered off condition until the user purposefully resets it To reset the system to normal power rotate the EMO button clockwise until it clicks out then press the Reset Button All components downstream of the SWITCHED plug on the Interlock Box will be powered off by the EMO button including the following e QST 1050 and QST 2002E subsequently High Field Magnet Chassis Ventilation Fans Monitor Optionally the PC not standard The software detects that an EMO event has occurred Whatever test was in progress 1s aborted and the software prompts operator to turn the power back on before continuing Once the power is restored the operator can either exit the software or home all axes and continue normal operation A Warning Power to the computer and monitor may not be disconnected by the EMO switch Also the Line Cord and some components within the Interlock Box will still be active even if the EMO Button is pressed 4 3 Cover Door Switches Door interlock override is installed by default It means if you open or close the door nothing will happen If you want
10. OM similar to EEPROM contents of QST boards in the Diagnostics window 15 High Field Transfer 1 Ha Grade Cycles rest Time Test Dae Time Pat ID Operator iD Tester Spa otio AN LK Hd NYA i 38593 HighFiediTram 4 18 20 181231 30 Averages fh Angular position Field Sweep Parameters Pombe ToGe nee ea High Field Transfer Gf the Magnet oo a 5000 25 Bw 10 Bias 0 201 Part ID Head 15000 Stress Parameters Paramete Grades Cr ir ci Current m Eg 61 Eg B1 Barkh Jump z 041 041 7999 07 214365 36 13 03 10401 15 ias Point 50 06 50 06 15000 10000 5000 0 5000 10000 15000 Magnetic Field Oe Clear Results Plot Reset Plot Scales Show All Curves Magnet Angle logged into Lot ID field Amplitude uv 6 3 Closed Loop gain and Magnetic Field Calibration Note Under normal circumstances it is not necessary to perform these calibrations It is only required when the magnet pole geometry is changed First to re program the closed loop gain go to High Field Parameters window and press the Calibrate Field Sensor button Second to calibrate the magnetic field use Omega Gauss Meter and probe assembly which is available for purchase separately 16 Insert the ISI Pole Spacer into the magnet insert the probe assembly into appropriate holes on the spacer With this configuration the field
11. e of stress conditions include field up to 15000 Oe write current to 60 mA O pk bias current to 20 mA full DFH exercise and elevated temperature With standard ISI open architecture design software using ActiveX technology customers can develop and revise their own custom tests in minutes with Visual Basic 2 Related Documentation The following documentation will be helpful to read and use with this manual Quasi97 Software Contains detailed description of all menus in Quasi97 software User s Manual along with procedures on how to set up test parameters log data and run the QST in production and engineering modes QST External Modules Description of additional tests provided with the QST and Quasi97 User s Manual software 3 System Components and Physical Characteristics The following sub assemblies are a part of the QST 2002HF QST 2002E Measurement electronics of the Quasi Static tester Field Magnet Monitor Interlock Box Controls power distribution throughout the QST 2002HF mH E QST 2002HF Full View Contents of Lower Frame with door open When planning the installation site you need to allow sufficient clearance for tester in normal operation and for maintenance There are two configurations with major differences in access dimensions with monitor directly on the tester and the model with monitor stand hanging on the side ergonomic Nominal dimensions for the QST 2002 HF are 27 W x 26
12. essed after either an EMO event or after the Main Power Switch has been turned ON to reset system power Cover Door Switches mounted to the upper frame Cover to detect that either of the Switches top Cover Doors are open Opening the door will shut off power to QST and the Magnet Maintenance A Service Key to override the Cover Door Switches in the event that Service Key maintenance operations are required within the upper frame area L The system should not be used if any components of the Interlock System do not work See Interlock Box Testing Procedure later in this chapter for component verifications EMD Switch serice Mode Key Main Power Switch Reset Button A description of the function and response of each of these Interlocks and the Hazards protected are listed below 4 1 Main Power Switch The Main Power Switch disconnects power to ALL modules inside the tester downstream of the Interlock Box electronics To turn OFF the power to the system push the switch down To turn ON the power push the switch up and press the Reset Button The Main Power Switch also has built in 10Amp circuit breaker which protects the equipment in the event of excessive current draw The software cannot detect the status of the Main Power Switch but will be non operational since the computer power will be off A Warning The Line Cord and some components within the Interlock Box will still be active even if the Main Power Switch is OF
13. ld 10 The dial attached to the back of the Magnet will show O in vertical position and 270 in horizontal position 5 9 ISI Pole Spacer ISI Pole Spacers are the tools provided with the QST 2002HF which are to be used in case of any pole gap or type modifications The spacers preserve symmetry of the pole gap with respect to the magnet cover opening and provide default gaps of 0 2 for tapered poles and 0 85 for flat poles One of them is inserted in between the poles of the High Field Magnet during shipping and should be removed and stored before running any tests ISI POLE SPACER 11 5 4 Magnet Pole Adjustment To adjust or reverse the poles of the High Field Magnet follow the steps in this section First remove back panel of the top plastic cover Change orientation of magnet from vertical to horizontal using instruction in section 3 2 Next loosen two screws located inside of the magnet This can be done by inserting a 10mm Allen wrench through the holes in the magnet cover into the screw and turning counter clockwise Note Do not unscrew more than 2 revolutions as the nut for the screw may come off m C Loosening these screws may require a large amount of force The torque value necessary is about 80 foot pounds or 110 Newton meters After loosening the screws the poles should be moveable without much resistance Now the pole gap can be changed or the poles can be reversed For pole gap adjust
14. ment you need to use ISI Pole Spacer and if you want to increase the distance use two identical shims on each side of the spacer Poles must be symmetrical relatively to the middle of the magnet cover opening The ISI Pole Spacer is designed to preserve such symmetry when inserted into the corresponding holes 12 Large amount of force should be used when tightening the screws after adjusting the appropriated pole gap The torque value necessary is about 80 foot pounds or 110 Newton meters N Warning If insufficient force is used to tighten the poles they can slide and fall out of the magnet possibly damaging the samples being tested Every time the pole gap and or shape is changed the closed loop gain should be re programmed followed by calibration of the magnetic field Refer to section 6 3 for calibration instruction HIGH FIELD MAGNET POLE DISTANCE VS FIELD RANGE Magnetic Field Range 0e 16500 14000 11000 9000 Not uniform Not uniform Not uniform Not uniform Not uniform Not uniform default configuration Warning Magnetic Field Hazard The High Field Magnet used on this system can disrupt pacemaker operation 13 6 Software tests and operation 6 1 High Field Transfer test High Field Transfer test was created specifically for the High Field Tester This test works like the Transverse test with the ability for the user to select field increment based on the field sweep ra
15. nge This feature was added to improve the test speed without sacrificing the high accuracy of measurement at specified field ranges Because of selectable step sizes the High Field Transfer reports Barkhausen Jump result using different units compared to the Transverse test The Barkhausen Jump result reports the highest Voltage difference between two neighboring points measured The units used in High Field Transfer test are uV Oe as opposed to uV used in the Transverse test JA High Field Transfer 1 81 xl Hd Grade Cycles TestTime Test_ Date Time PatlD JOperatorID T a n pe verages Field Sweep Parameters FromOe ToOe IncOe DE 300 5 Append Item 300 5000 25 5000 15000 100 Delete Item High Field Transfer Plot Sub Title Stress Parameters Results Parameters Grades x t gt Clear Results Plot Reset Plot Scales Show All Curves The High Field Magnet uses the Magnet Response Time programmed into the QST Motherboard EEPROM accessible from the Diagnostics window to determine the delay time for field steps up to 50 Oe For steps higher than 50 Oe the delay time is calculated using a polynomial function with coefficients saved in the High Field Interconnect board EEPROM which can be accessed from the High Field Parameters menu This delay generating function has been generated specifically to optimize the tests run
16. o sections 5 3 and 5 4 for pole spacing modification instructions and to section 6 3 for closed loop gain and magnetic field recalibration instructions For more details on the hotfinger operation software connections and troubleshooting please refer to the Watlow Manual Treat Hotfinger as the Hot only configuration when using the Watlow manual Also please note that if Hotfinger needs to be removed from the High Field tester it 1s recommended that the temperature controller QPS 1050H C be powered off before removing the tooling Power up the temperature controller only when Hotfinger tooling is completely reconnected 19 9 Specifications Write Channel Current Range 0000 10 0 60 0 mA bp Current Resolution 1 6 mA Frequency Range 12 5 400 MHz Resolution esns 1 MHz Last Polarity Programmable DC Write Capable Yes DC Polarity Programmable Yes Read Bias Currents her c 20 mA Resolution 2 4 uA PECCISUOBE srusen ss 3 uA Bias Off During Write Selectable Magnet Power Supply Mode T QPS 1050 DC Output Range 10A Peak Power coueeccemain 400W Max Field 4 sisesster etras 15 000 Oe Field Resolution 2 0 Oe UO OTE serccdeccerecatnen pe lt 2 Accuracy 0 2 Gap the greater of 20 Oe or 2 Accuracy 0 85 Gap the greater of 10 Oe or 4 2 Gap ICIS IM ooo oec
17. pendix A Stray Magnetic Field Figures 22 A Warning Magnetic Field Hazard G The High Field Magnet used on this system can disrupt pacemaker operation 1 Introduction The QST 2002HF or High Field Tester is an engineering test system for characterizing the performance of MR Heads at the Head Gimbal Assembly level at magnetic fields up to 15 000 Oe Most of the features of the High Field tester are based on the QST 2002 and therefore for tests and tooling information please refer to the QST 2002 manual Tests and mechanical features specific to the High Field tester will be covered in this manual Low Frequency measurements include Resistance and Transfer Curve analysis High Frequency measurements include the most advanced instability detection system available today These measurements performed through our unique HF channel with integrated digital scope include Popcorn HF Noise and patented Spectral Maximum Amplitude Noise SMAN The ultra high range of the QST 2002HF allows observation of sensor characteristics such as pin layer reversal and demagnetization in extreme conditions It is capable of resetting the hard magnetic layer at HGA and HSA level by applying an extremely high longitudinal magnetic field Weakly pinned layers can be characterized by applying extremely high magnetic fields at different angles from Q0 90 degrees Other applications include initialization investigation and environmental robustness The full suit
18. recalibration of the magnetic field 7 Quasi97 All Quasi 97 tests are available on the QST 2002HF with exception of AC noise test and Popcorn Sweep with AC field option measurement When running Transverse Curve the maximum field increment value is 50 Oe and the minimum increment value will be dependent on Magnet Pole geometry For the default magnet pole geometry 0 2 gap tapered poles the minimum increment value is about 3 Oe 17 8 Toolings 8 1 Hall Effect Cartridge Hall Effect Cartridge 1s a verification tool for verification of the magnitude and linearity of the magnetic field This cartridge is compatible with Gen2 2x HGA base and board assembly 8 2 HGA Tooling Like QST 2002 the QST 2002HF can be used to test HGA HSA and HDA samples The HGA toolings designed for the High Field Tester can be used on QST 2002 The main difference between HGA tooling for the two testers is an extension piece which has been added to make the tooling mechanically compatible with the High Field magnet 8 3 ESD Module HBM MM and CDM HBM and MM ESD testing modules are fully compatible with High Field system These modules can be used with the tapered poles configuration and at maximum magnetic field of 15000 Oe CDM module requires a rework and can operate only in the range of 5000 Oe fields in the tapered poles configuration For more information contact ISI 18 8 4 HSA and HDA Toolings Low Profile HSA tooling wa
19. s designed to work with the High Field tester Similarly to the HGA toolings the HSA toolings are equipped with an HSA Extender Block for mechanical compatibility with the High Field Magnet The magnet must be set to 0 85 spaced Flat Pole configuration and magnet rotation is not available in the HSA HDA mode Adjustment of locked unlocked position hardstops may be needed for different HS A HDA fixturing applications See section 5 1 E ELI P j E Be E EN i i a 1 a ei ae EA a 1 T Ae I s a a 2 ae jas T F i axe NE rm Fi S Em s EL P gr PF iac ams UI 4 SUE E X pio MO HSA Tooling with Extender Block HSA tooling on High Field Tester HSA Extender Block 7 B H Dependent on geometry and tooling HDA testing may be available for this tester as well For more information contact ISI 9 5 1x Hotfinger HGA Temperature Stress System The Ix Hotfinger can be used with the QST 2002HF with Flat Magnet Pole configuration The pole spacing required for compatibility with 1x Hotfinger 1s 0 85 giving the maximum field range of 5000 Oe The following parts and equipment are needed o reconfigure the magnet spacing ISI Pole Spacer Gauge block shim set 10mm Allen wrench Omega Gauss meter with HF probe assembly Every time the spacing of the poles is modified the closed loop gain and the magnetic field must be recalibrated Please refer t
20. s performed if the tooling clears the Magnet Core assembly when in the Unlocked Position Factory adjustment provides about 2 of clearance for easy removal of the head assembly The Locked Position Hard stop must be adjusted such that the head gap is centered within the Magnetic Core field as seen from the side see picture below Note The Bias will turn on only if the carriage reached the locked position hard stop For tapered pole configuration the Head should be positioned within 0 3 0 76 cm of the center of the poles HGA SIDE VIEW 5 2 Changing Orientation of the Magnet Core Field The Magnet Core can easily be changed between Transverse Hard Axis and Longitudinal Easy Axis orientations This 1s done by loosening the thumbscrews on the back of the Magnet Core Housing rotating the Magnet Core Housing to the desired angle and tightening the thumbscrews When rotating the magnet it is recommended for the tooling to be slid out of the magnet and moved into the Unlocked Position Hard stop For Magnet angle monitoring you can refer to the dial in the back or the High Field Magnet Position Dial feature in the Quasi 97 gt High Field Parameters menu JA High Field Magnet Rotation Magnet Position Dial Window in Quasi 97 The Magnet Position Dial window in Quasi 97 will display O degrees with magnet in vertical position Transverse Field and 90 degrees with magnet in horizontal position Longitudinal Fie
21. to use the Door Cover Switch you can connect cable instead of jumper Cable connected In case if cable connected The Door Cover Switches are embedded into the top Cover assembly and are engaged only when the Cover Doors are closed When disengaged meaning either Cover Door is opened the power to the QPS 1050 will be disconnected therefore stopping any current flow into the High Field Magnet The Doors should only be opened during maintenance or normal loading of customer parts for test The following components will be turned off directly by the Cover Door Switches e QPS 1050 e QST 2002E No other components will be affected This means the following components that will NOT be affected by the Door Cover Switches are e Interlock Box e Computer e Monitor e Chassis Ventilation Fans The software will detect that either Cover Door is open through a signal from the Interlock Box Once detected the software will abort any operation in progress and will display a message box informing that system power is off After closing the doors the software can be restarted N Warning The Cover Door Switches disconnect power to the Magnet and measurement circuitry only if the Service Key is in normal mode or removed If the system is in Service Mode using the Service Key refer to Service Key section then the Cover Door Switches will be disabled 4 4 Service Key A Service Key is provided as an override for the Cover Door Switches
22. usini 0 1 uS Threshold Resolution Suv Threshold Accuracy ccccceeeeeeees 10 uV NO O e E 2 nV sq rt Hz WIR IRC COV CI S coeno cuiua 2 us 21 Appendix A Stray Magnetic Field Figures The following figures represent the maximum magnitude of magnetic field measured at specified distances from the center of the Magnet Poles The values are measured with maximum magnetic field set 15000 Oe for 0 2 spaced Tapered Poles and 5000 Oe for 0 85 spaced Flat Poles MEASUREMENT PLANE 2 7 1 09 ABOVE GAP CENTERLINE MEASUREMENT PLANE 1 GAP CENTER MEASUREMENT PLANE 3 i 1 09 BELOW GAP CENTERLINE LLLI 0L QST 2002 7 Horizontal Stray Field Measurement Planes 22 0 2 Spaced Tapered Poles Measured at Plane 1 Center of Pole Gap D k g a DISTANCE FROM mm OF POLES VEASURED FIELD THIS VALUE IS CONSTANT ALONG THE PERIMITER OF THE CIRCLES a DISTANCE FROM mma 0 2 Spaced Tapered Poles Measured at Plane 2 Above Gap Centerline OF POLES e VIEASURED FIELD THIS VALUE IS CONSTANT ALONG THE PERIMITER OF THE CIRCLES 0 2 Spaced Tapered Poles Measured at Plane 3 Below Gap Centerline a DISTANCE FROM MA OF POLES IO el VIEASURED FIELD THIS VALUE IS CONSTANT ALONG THE PERIMITER OF THE CIRCLES 25 0 85 Spaced Flat Poles Measured at Plane 1 Center of Pole Gap eo Z7 ui PLAC
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