910 User Manual - Electro Tech Systems
Contents
1. ON OFF switch to OFF up Set the INTERVAL control to 9 the COUNT HOLD switch to COUNT then depress the RESET switch and when ready depress the DISCHG Switch Using an external timing reference measure the time interval between flashes of the AMBER DISCHARGE light Adjust the INTERVAL control until the desired cool down period is obtained NOTE The discharge cycle time has been set during assembly to 0 65 seconds hence the cool down time will be the time measured between flashes of the amber DISCHARGE light minus 0 65 seconds Refer to Figure 2 0 3 After calibration turn on the High Voltage High Voltage ON OFF switch to ON Discharge Pulse Count Setting To select the number of discharge pulses rotate the DISCHARGE selector until the desired number is opposite the point marking on the panel Automatic Discharge Pulse Generation Depress the RESET button to set the AUTO mode counter to zero When ready to start the automatic test sequence momentarily depress the DISCHARGE button The Automatic mode timing sequence starts with the interval delay hence the first discharge pulse will not occur until the INTERVAL time has lapsed Upon reaching the end of the first interval the AMBER DISCHARGE indicator will flash the AUTO mode indicator will advance to the count of one and the first discharge pulse will be generated This sequence will continue until the AUTO mode readout displays the same number as set on the DISCHARGES2. the high voltage output is disabled High Voltage HI LO Mode Select This switch push on push off selects either the LO Voltage Range 0 to 2kV when in the up position or the HI Voltage Range 0 to 10K when in the down position The unit will change modes only if the HIGH VOLTAGE ON OFF switch is in the OFF up position The mode LEDs directly below the DPM shown in Figure 2 2 2 indicate the mode selected NOTE If the indicator lights indicate a mode that is different from that selected by the push buttons the user must turn off the high voltage The unit will then automatically switch to the correct mode This is a safety feature which protects the unit s internal components from switching when high voltage is present High Voltage POLARITY Select This switch push on push off selects the polarity of the discharge pulse that is to be generated by the Discharge Simulator When in the up position a positive pulse is produced and when down a negative pulse NOTE As with the HI LO mode select switch the Simulator will only respond to a change in the setting of the POLARITY select switch when the HIGH VOLTAGE ON OFF switch is in the OFF position High Voltage COARSE and FINE Adjust These two controls adjust the level of the high voltage This voltage will be near zero with both controls fully counterclockwise and increases as each control is rotated clockwise The COARSE adjust control is used to set the high voltage level close
3. 5V logic input with a minimum of 1mA The required signal is a positive pulse from 0 5V 200msec duration having a rise and fall time of less than 100usec Pin 1 of the DIN connector is signal ground and Pin 3 is the trigger signal Pin 4 is system 12 ground and Pin 5 controls the Optional Model 9902 trigger In addition a High Voltage connector is installed near the banana jack for the Model 9902 Remote Discharge Input MADE IN USA Figure 2 0 8 Rear Panel NOTE The Model 910 starting with Serial 358 utilizes universal switching power supplies that operate from 90 260VAC 50 60Hz it will not be necessary to change the voltage settings or the 34 Amp Sloblo 750mA Time Delay fuse in the Power module 3 0 OPERATION 3 1 Initial Set Up Before connecting the Simulator to the AC line MAINS set the controls on the front panel to the following positions 1 POWER ON OFF OFF up 2 HIGH VOLTAGE ON OFF OFF up 3 High Voltage COARSE and FINE adjust both fully counterclockwise 3 1 1 Human Body and Machine Model Installation The Model 910 ESD Simulator features plug in components to achieve the HBM and MM networks The HBM consists of a total 100pF of capacitance that is discharged through a 1500 Ohm resistor module that also contains a wave shaping network to obtain the specified discharge waveform These components are shown in Figure 3 0 1a along with the associated test leads The high voltage discharge re
4. is used to decrease the value of the displayed charging voltage relative to the actual voltage stored in the Human Body Model capacitor This control is set at the factory and should not be adjusted unless the instrument is being recalibrated Indicators The Model 910 Electrostatic Discharge Simulator utilizes LED indicators for all status and numeric readouts These are located on the vertical sloping portion of the enclosure above the control panel as shown in Figure 2 0 6 PULSE CUR PEAK PULSE AMPLITUDE a AUTO MODE OUTPUT don Figure 2 0 6 Display Panel Status Indicators High Voltage Mode Two indicators are provided to indicate which of the two voltage modes the unit has been set for The GREEN indicator will be on when the unit is set for LO Voltage 0 to 2kV while the AMBER indicator will be on when the HI Voltage Mode has been selected These indicators that display the actual mode programmed are controlled by the HI LO select switch and the HIGH VOLTAGE ON OFF switch When the High Voltage switch is in the ON down position changes in the setting of the HI LO mode select switch will be ignored by the system and the status lights will not alter their indication High Voltage ON This single RED indicator will be illuminated when the high voltage power has been turned on It is a signal to the operator that high voltage may be present depending on the setting of the HI Voltage COARSE and FINE adjust controls Polar
5. meets all of the testing requirements specified in Mil Std 883E Method 3015 7 ESD STM 5 1 JEDEC TEST METHOD A114 A and other specifications based on the Mil Std 883E model The Machine Model MM as defined in ESD STM 5 2 is An electrostatic discharge simulation test based on a discharge network consisting of a charged 200 picofarad Capacitor and nominally zero ohms of series resistance Actual series resistance and inductance are specified in terms of the current waveform through a shorting wire The simulation test approximates the electrostatic discharge from a machine The Machine Model network is standard with the Model 910 The Charged Device Model CDM as defined in ESD STM 5 3 is when a component is slowly charged to a given voltage and then discharged to ground through one or more leads of the device The CDM is available as an option Another model commonly used is the one specified in IEC61000 4 2 This model simulates a person holding a tool when discharging to a device It is typically used for system ESD testing The model 150pF 330Q can be added to the Model 910 as a customized option The Model 910 utilizes individual plug in resistor and capacitor networks to achieve the required waveforms Figure 1 0 2 shows typical HBM MM and IEC waveforms Human Body Model HBM Machine Model MM IEC Hand Tool Model 100pF 150022 200pF 0Q 150pF 330Q Figure 1 0 2 Typical HBM MM and IEC waveforms The Model 910
6. that allows an isolated device to be charged slowly enough not to cause an ESD discharge as specified in current CDM standards In addition the REMOTE output of the Model 910 provides 5V to operate an external CDM test fixture that is capable of performing both field induced and direct charging tests The Charge Device Model CDM is a more severe test than the standard HBM model since this event occurs when the device itself becomes charged then when touched to ground or a lower potential causes a very fast rise time discharge to occur as shown in Figure 5 0 3 Charge Touch to GND for discharge GND Figure 5 0 3 Basic Charge Device Model equivalent circuit The CDM discharge is a function of the device capacitance that may be as low as a few picofarads the example is a 6 8pF disc or can be as high as several hundred picofarads a complete assembly This variation has a significant affect on the severity of the discharge Small component packages may not be able to hold sufficient charge to meet specified discharge levels 26 The Charged Device Model CDM test as defined in standards JEDS22 C101C ANSI ESD STM 5 3 and AEC Q101 005 describe a test procedure where a component is slowly charged to a given voltage and then discharged to ground through one of the device leads The CDM test permits either field induced or direct charge discharge The optional Model 9903 Charge Device Test Fixture shown in Figure 5 0 4 is a comp
7. DS WITHOUT THE BLACK TUBING AT THE PLUG END MUST BE USED TO OBTAIN THE CORRECT MM WAVEFORM keng ee PRR P ye Ne ae RISRSEE Ae a at TIME IN NANOSECONDS CURRENT IN AMPERES PI hal D D L lt YEN AAN DAN R O O O O re GG WD Pi tt yt TT op 20 60 80 100 120 140 160 A ia 200 TIME IN NANOSECONDS CURRENT IN Figure 4 0 8 Current waveform through a 500 Ohm resistor to ground 23 5 0 DUT TESTING PROCEDURE 5 1 5 2 Set Up Set the High Voltage controls to the desired Range and Polarity Turn the HIGH VOLTAGE ON and adjust for the desired voltage level Insert the DUT into either the clamping fixture or the appropriate optional zero insertion force Socket Test Fixture Connect the minigrabber or to the desired pin pairs when the clamping fixture is used lf a Socket Test Fixture is used follow the procedure described in Figure 5 0 1 on how to program the module for the desired pin group configurations Use the 080 plug cables to connect the socket module to the Simulator output jacks Test Procedure lf manual operation is desired select MAN mode button up Set the COUNT HOLD button to COUNT Depress the DISCHARGE button to initiate a discharge across the DUT Each time the DISCHARGE button is depressed a discharge will occur To reverse polarity turn the HIGH VOLTAGE to OFF and set the COUNT HOLD button to HOLD optional depress the POLARITY button for either or then turn the HIGH
8. ELECTROSTATIC DISCHARGE SIMULATOR Model 910 Operating Manual 11 12 electro tech systems inc www electrotechsystems com 3101 Mt Carmel Avenue Glenside PA 19038 Tel 215 887 2196 Fax 215 887 0131 IMPORTANT SAFETY INSTRUCTIONS Equipment containing HV The equipment described in this Manual is designed and manufactured to operate within defined design limits Any misuse may result in electric shock or fire To prevent the equipment from being damaged the following rules should be observed for installation use and maintenance Read the following safety instructions before operating the instrument Retain these instructions in a safe place for future reference POWER POWER CORD Use only the power cord specified for this equipment and certified for the country of use If the power mains plug is replaced follow the wiring connections specified for the country of use When installing or removing the power plug hold the plug not the cord The power cord provided is equipped with a 3 prong grounded plug a plug with a third grounding pin This is both a safety feature to avoid electrical shock and a requirement for correct equipment operation If the outlet to be used does not accommodate the 3 prong plug either change the outlet or use a grounding adapter FUSES Replace fuses only with those having the required current rating voltage and specified type such as normal blow time delay etc DO NOT use makes
9. MM use the leads without the black tubing Incorrect leads will result in out of spec waveforms Refer to Figure 3 0 1 Connect the test lead spring loaded minigrabber to the appropriate leads on the DUT mounted in the Universal Test Fixture as shown in Figure 3 0 3 Socket test fixtures use 0 080 8mm pin plugs For the best possible output waveshape the leads should be positioned such that they are away from one another by a minimum of 4 18mm and away from the units chassis ground Do not reverse the test leads when the opposite polarity is desired Switch the HVPS to the opposite polarity 3 2 Initial Turn On Refer to Figure 2 0 4 for the location of the various controls described below 3 2 1 3 2 2 Power Turn on by placing the POWER ON OFF switch in the ON down position The Power ON state will be indicated by illumination of the colored status indicators The AUTO Mode indicator may or may not be illuminated depending on the setting of the AUTO MAN selector switch Charging Voltage Set up The Procedure described in this section is common to both the Manual and the Automatic Mode and should be followed independent of the mode selected HI LO Voltage Select Select the desired operating voltage by placing the High Voltage HI LO switch in the LO position up for testing below 2000V or in the HI position down for testing at or above 2000V to a maximum of 8000V Polarity Select Set the POLARITY switch to
10. Round trip freight and related charges are the owner s responsibility WARNING WOODEN CRATES MUST NOT BE USED TO PACKAGE THE ELECTRONIC UNITS PACKAGING OF DELICATE INSTRUMENTS IN WOODEN CRATES SUBSTANTIALLY INCREASES THE CONTENT S SUSCEPTIBILITY TO SHOCK DAMAGE ELECTRO TECH SYSTEMS INC WILL NOT ASSUME RESPONSIBILITY FOR ADDITIONAL COST OF REPAIR DUE TO DAMAGE INCURRED DURING SHIPMENT DUE TO POOR PACKAGING 28
11. VOLTAGE back on and set the COUNT HOLD button to COUNT NOTE The HIGH VOLTAGE must be turned off before Polarity or Range can be changed If the AUTO Mode is desired set the OPERATING Mode controls to AUTO and HOLD Select the number of discharge pulses 1 9 and cool down interval period button to start the test sequence These settings are typically 3 discharges at 1 second intervals The first discharge will occur after the INTERVAL time selected has elapsed Each discharge will register on the AUTO Mode display until the total number of cycles selected have been completed To interrupt the test cycle set the COUNT HOLD button to HOLD To resume the test depress the DISCHARGE button To start a new cycle depress the RESET button then depress the DISCHARGE button 24 5 3 A Pins 1 9 amp 36 40 tied together Group 1 B Pins 10 14 tied together Group 2 C Pins 15 20 tied together and connected to Group 1 D Pins 21 25 tied together and connected to Group 2 OUTPUT GND Figure 5 0 1 Programming IC Adapter Modules HBM Method 3015 7 ANSI ESD STM5 1 amp JESD22 A114 B A sample of devices shall be characterized for the device ESD failure threshold using voltage steps of 500 1000 2000 and 4000 Volts as a minimum Finer voltage steps may optionally be used to obtain a more accurate measure of the failure voltage Testing may begin at any voltage step except for devices which have demonstrated healing effects including t
12. and microcircuits This latent failure mechanism results in performance degradation and eventually a failure Personnel are prime sources of ESD for damaging electrical and electronic parts Electrostatic charges generated by rubbing or separating materials are readily transmitted to a person s conductive sweat layer charging that person When a person handles or comes in close proximity to an ESD sensitive part that part can then be damaged from a direct discharge by touching the part or by subjecting the part to an electrostatic field The ESD from a human body can be reasonably simulated for test purposes from the circuit shown in Figure 1 0 1 R 1500 fr P DISCHG Variable C 100 pf Voltage T Figure 1 0 1 Basic Human Body Model equivalent circuit This circuit is specified in Mil Std 883E Method 3015 7 and ESD STM 5 1 to represent a human body discharge for ESD testing The human body capacitance however may be as high as several hundred picofarads but more typically 50 to 250 pf Studies have shown that approximately 80 of the population tested have a capacitance of 100 pf or less The variation in human capacitance is due to factors such as variations in the amount and type of clothing and shoes worn by personnel and differences in floor materials Human body resistances can range from 100 to 100 000 ohms but is typically between 1 000 and 5 000 ohms for actions that are considered pertinent to holding or touching ESD se
13. aner as these products may have an adverse affect on system performance SERVICE Do not attempt to repair or service the instrument yourself unless instructed by the factory to do so Opening or removing the covers may expose you to high voltages charged capacitors electric shock and other hazards If service or repair is required contact the factory 1 0 INTRODUCTION The rapid advancement in the electronics industry during the past decade has placed an ever increasing importance on the understanding of electrostatics and its effect on electronic devices and systems Electrostatic discharge ESD is a common cause of microelectronic circuit failure Many devices can be seriously damaged or destroyed by an electrostatic discharge below 20 Volts The sensitivity to ESD of other components has also become evident through use testing and failure analysis The trend in technology towards greater complexity increased packaging density and hence thinner dielectrics between active elements result in parts becoming even more sensitive to ESD Failure mechanisms of electrical and electronic parts due to ESD typically include thermal breakdown metalization melt and bulk breakdown that are power dependent dielectric breakdown metalization to metalization arc over surface breakdown and surface inversion that are voltage dependent ESD can also induce latent failure mechanisms in both MOS structures and bipolar junctions in both discrete devices
14. anufactured by the manufacturer and found to have been defective The Seller shall not be liable for damage resulting or claimed to result from any cause whatsoever This warranty becomes null and void should the equipment or any part thereof be abused or modified by the customer of if used in any application other than that for which it was intended This warranty to replace or repair is the only warranty either expressed or implied or provided by law and is in lieu of all other warranties Seller denies any other promise guarantee or warranty with respect to the equipment or accessories and in particular as to its or their suitability for the purposes of the buyer or its or their performance either quantitatively or qualitatively or as to the products that it may produce The buyer is expected to expressly waive rights to any warranty other than that stated herein ETS must be notified before any equipment is returned for repair ETS will issue an RMA Return Material Authorization number for return of equipment Equipment should be shipped prepaid and insured in the original packaging If the Original packaging is not available the equipment must be packed in a sufficiently large box or boxes if applicable of double wall construction with substantial packing around all sides The RMA number description of the problem along with the contact name and telephone number must be included in formal paperwork and enclosed with the instrument
15. e Tektronix CT 1 is polarized and is marked with a on one side When 20 verifying a positive discharge pulse the OUTPUT signal from the 1 5kQ resistor should be connected to this side When verifying a negative discharge pulse the GND connection should be connected to this side No changes in scope setting are necessary 4 1 2 Calibration Procedure Peak Current Rise Time and Ringing at 4kV Set the scope vertical amplifier sensitivity to 2 Volts Div and the time base to 5 nsec Div If the CT 1 probe is used then the total current measurement range is 3 2 Amps CTI 1 Probe calibration is 5 Volts Amp Probes with different calibration will necessitate using different scope vertical amplifier settings At a charging voltage of 4kV the peak current Ip must be 2 67 amps 10 2 40 2 93 Amps If using the Tektronix Model 2067 analog scope switch the vertical amplifier out of the CAL position and adjust the vernier such that a discharge pulse will go from the 0 graticule marking to the 100 graticule marking as shown in Figure 4 04 The rise time is defined as the time for the leading edge to rise from the 10 point to the 90 point The specification calls for a rise time between 2 and 10 nsec For the Model 910 ESD Simulator the rise time will normally fall between 2 5 and 8 nsec The peak to peak ringing must be less than 15 of Ip If using a digital scope all the calculations are performed by the scope and displayed on t
16. e a minimum frequency response of 350 MHz or better and a sampling rate 1 Gs sec or better Tektronix TDS 300 and 3000 series Agilent Technologies Model DSO6102A or any other oscilloscope that meet this criteria are satisfactory If CDM testing is also to be performed then a 1GHz scope should be obtained to perform all three tests Tektronix Models CT 1 or CT 2 current transducers are satisfactory for detecting the current pulse The 50 Ohm impedance of the current probe must be matched to the input impedance of the oscilloscope For oscilloscopes with only a 1 MegOhm input impedance a terminator is available to match the 50 Ohm impedance of the probe to the 1 MegOhm impedance of the scope Because of the very high frequencies being measured it may be necessary to double shield the current probe Figure 4 0 1 is the waveform requirement Peak to peak ringing not drawn to scale The current pulse shall have the following characteristics T rise time 2 10 nanoseconds Ty decay time 150 20 nanoseconds peak current within 10 l ringing The decay shall be smooth with ringing break points double time constants or discontinuities less than 15 lp maximum but not observable 100 nanoseconds after start of the pulse Figure 4 0 1 Current Waveform per Method 3015 7 To obtain this waveform place a 1 25 81mm 18 gauge wire through the CT 1 sensor then connect the minigrabber leads to the wire The current prob
17. er up or during changing of test samples Automatic Mode MAN AUTO Mode Select This push push switch when placed in AUTO down position places the unit in the Automatic mode In this mode the AUTO Mode numeric indicator will be illuminated DISCHARGES Selector This ten position switch selects the number of discharge pulses that will be automatically produced by the Simulator once the DISCHARGE button is depressed It is set before the start of a discharge test sequence by rotating the control until the number on the control knob flange corresponding to the desired number of pulses is opposite the black pointer on the control panel INTERVAL Adjust This rotary control is functional only in the Automatic mode and determines the time interval or delay between discharge pulses The control is rotated clockwise to increase the time interval from a minimum of approximately 0 5 seconds to a maximum of 30 seconds It should be noted that the interval setting of this control corresponds to the approximate cool down period between discharge cycles Since each discharge cycle lasts about 0 65 seconds the minimum discharge period pulse to pulse duration is about 1 1 seconds This timing relationship is illustrated in Figure 2 0 5 JL TI Discharge Cycle ais Cool Down Interval 65 sec e Pulse to pulse period 0 65 interval setting Figure 2 0 5 Automatic Mode Timing Cycle METER CAL This calibration control
18. eter to correspond to the actual charge on the capacitor A detailed description of all controls and indicators is provided in the following paragraphs Controls All controls for operating the Discharge Simulator are located along the front edge of the unit as shown in Figure 2 0 4 Four types of controls are used two position push button switches momentary push button switches rotary controls and a ten 10 position rotary switch The status of the 2 position push button switches are indicated by panel markings above and below each switch The marking above each switch defines the mode with the switch in the up position Accordingly the marking below defines the state with the switch in the down position OPERATING MODE cdl EM MAN COUNT RESET DISHO ADJUST INT T VE ma eee Soe 20 FINE j G AUTO HOLO DISCHARGES SECONDS MIN CO Figure 2 0 4 Front panel controls 2 2 1 2 2 2 Main AC Power ON OFF This self latching push on push off switch controls the AC power MAINS input to the unit When placed in the down position the AC power will be ON and the front panel indicator lamps will be illuminated High Voltage Controls High Voltage ON OFF This switch push on push off controls the high voltage output of the Simulator In the down position the high voltage output is turned on enabling the capacitor to be charged to the level shown on the DPM When this switch is in the OFF position up
19. he screen and printout as shown in Figure 4 0 4 j AAR m A l mn ai fae Rise 5 85ns l Mali j 244A H Comite e Alle Bw Lait oe AC RE Figure 4 0 4 Rise Time and Ringing Waveform at 4kV Fall Time at 4kV set the scope vertical amplifier sensitivity 2 Volts Div the same setting as was done for the rise time measurement Change the time base to 50 nsec Div The discharge pulse should resemble that shown in Figure 4 0 5 The fall time decay time must be 150 20 nsec from the 100 point to the 37 point 2l Falli y 134 0ns J Mast rt 251A e Dt ES By tant SC Figure 4 0 5 Discharge Pulse Fall Time Measurement at 4kV 4 1 4 Additional Information The measurement of the current waveform can be significantly affected by the test instrument used Excessive ringing and poor waveform characteristics could be a result of an incorrect test set up or an oscilloscope that is not adequately shielded The charging voltage calibration is preset at the factory No field adjustment should be made to the METER CAL adjustment The Model 910 incorporates a curve tracer output The CURVE TRACER output connector is connected to the output side of the discharge relay when in the CHARGE Mode and is disconnected from this point during the DISCHARGE cycle This switching function is accomplished by a high voltage relay This relay since it is part of the discharge circuit does affect the purity of the d
20. hift fuses or short the fuse holder This could cause a shock or fire hazard or severely damage the instrument POWER LINE VOLTAGE MAINS If the line mains voltage is changed or isolated by an autotransformer the common terminal must be connected to the ground earth terminal of the power source OPERATION CAUTION Equipment designed to simulate a high voltage electrostatic discharge such as the Series 900 ESD Simulators and the Model 4046 Static Decay Meter utilize voltages up to 30kV The basic nature of an ESD event will result in electromagnetic radiation in addition to the high level short duration current pulse Therefore personnel with a heart pacemaker must not operate the instrument or be in the vicinity while it is being used DO NOT OPERATE WITH COVERS OR PANELS REMOVED Voltages inside the equipment consist of line mains that can be anywhere from 100 240VAC 50 60Hz and in some equipment voltages as high a 30kV In addition equipment may contain capacitors up to 0 035 uF charged to 30kV and capacitors up to 0 5 uF charged up 6kV Capacitors can retain a charge even if the equipment is turned off DO NOT OPERATE WITH SUSPECTED EQUIPMENT FAILURES If any odor or smoke becomes apparent turn off the equipment and unplug it immediately Failure to do so may result in electrical shock fire or permanent damage to the equipment Contact the factory for further instructions DO NOT OPERATE IN WET DAMP CONDITIONS If water or
21. hose with spark gap protection which shall be started at the lowest step Cumulative damage effects may be eliminated by retesting at the failure voltage step using a new sample of devices starting at one or two voltage steps lower than the failure threshold 5 3 1 Control Settings Initially select the LO Range Polarity and adjust the level to 500 Volts Select the AUTO Mode and set the number of DISCHARGES to 3 and the INTERVAL cool down period to a minimum of 1 second 5 3 2 Testing Procedure Refer to the appropriate test standard being used to establish the correct testing protocol starting voltage number of discharges pin combinations etc 25 MM ANSI ESD STM5 2 Machine Model testing is described in ANSI ESD STM5 2 that is available from the ESD Association at 7900 Turin Road Rome NY 13440 This Standard defines five component classification levels and four stress levels as shown in Figure 5 0 2 Testing protocol and pin combinations are also defined Level __ Firstpeak current Peak current into Current into 500 Equivalent into a shorting wire 500 ohms IPAR ohms at 100ns Charging voltage Ip1 Amps Amps Amps Vp volts Figure 5 0 2 MM classification and stress levels CDM Charged Device Model Option The standard Model 910 is not configured to perform Charged Device Model testing directly However the charging system of the Model 910 incorporates a 400 MegOhm resistor in the charging circuit
22. ill start again from Zero NOTE THE DISCHARGE SIMULATOR IS CAPABLE OF PRODUCING HIGH VOLTAGE OUTPUT PULSES OF UP TO 8 000 VOLTS ATA STORED ENERGY LEVEL OF ABOUT 75x10 JOULES WHEN IT IS NECESSARY TO HANDLE THE DUT OR ANY OF THE OUTPUT INTERCONNECT TEST LEADS IT IS RECOMMENDED THAT THE HIGH VOLTAGE ON OFF SWITCH BE PLACED IN THE OFF POSITION AND THE COUNT HOLD BUTTON BE SET TO HOLD 4 0 WAVEFORM VERIFICATION PROCEDURES 4 1 Human Body Model Mil Std 883E Method 3015 7 ANSI ESD STM5 1 amp JESD A114B These test methods require system calibration utilizing the discharge pulse current waveform The Human Body Model is C 100pF and R 1500 Ohms The waveform must be verified using both and 4kV charging voltages The discharge current must be within 10 of the specified lp value 2 67 Amps Photographs of the rise time fall time and peak current calibration are required Figure 4 0 1 shows the waveform requirements specified in Method 3015 7 and ANSI ESD STM5 1 USE THE HBM TEST LEADS WITH THE BLACK TUBING AT THE PLUG END TO OBTAIN THE CORRECT WAVEFORM 4 1 1 Set Up A high speed oscilloscope and current probe with a bandwidth of at least 350 MHz and a visual writing soeed 4 cm nsec minimum are required Scopes satisfactory for this measurement are the Tektronix Model 2467 high speed analog oscilloscope or the Model 7834 or 19 7934 storage oscilloscopes Digital Storage Oscilloscopes DSO should also hav
23. is available with the optional Model 9902 Remote Discharge Probe that operates only in the LO Range up to 2000V for HBM MM and CDM Models The Model 910 must be modified to provide the necessary signals to operate the Probe The Probe shown in Figure 1 0 3 can be used as a handheld device or with the addition of remote cables be attached to an automatic test system Figure 1 0 3 Model 9902 Remote Discharge Probe 2 0 EQUIPMENT DESCRIPTION 2 1 General The Model 910 Electrostatic Discharge Simulator shown in Figure 2 0 1 is designed to produce discharge pulses that meet the requirements of Mil Std 883E Method 3015 7 and ESD STM 5 1 for HBM and ESD STM 5 2 for MM ESD sensitivity testing The pulse amplitude may be set to any level from less than 20 Volts to 8 25kV and may be either positive or negative Two voltage ranges are provided 0 to 2kV and 0 to 10kV A digital readout indicates the voltage level stored in the Human Body Model HBM capacitor prior to discharge In the Low Voltage Mode 0 to 2kV the Digital Panel Meter DPM provides an adjustment resolution of 1V In the High Voltage Mode the resolution is 10V Device testing may be performed either manually or automatically In the Manual mode the user initiates each discharge pulse In the Automatic mode the user selects the number of discharge pulses desired 0 9 and the time interval between pulses lt 0 5 20sec When the DISCHARGE button is pushed the correct numbe
24. ischarge waveform Disconnecting this relay from the discharge relay will reduce the ringing associated with the current waveform ANSI ESD STM5 1 also requires an additional calibration waveform using a 500 resistor to ground Other standards such as the JEDEC standards reference Method 3015 7 and or ANSI ESD STM5 1 The specific standard to which testing will be performed should be referred to for the correct calibration of the Model 910 ESD Simulator Machine Model ANSI ESD STM5 2 This standard requires system calibration utilizing the discharge pulse waveform obtained from a 200pF capacitor discharged through 0 Ohms to ground The same oscilloscope and current transducer setup used for HBM verification are used for the MM verification waveforms ZZ The waveform must be verified using both and 400 Volts through both a short circuit to ground and through a 500 Ohm resistor Other stress levels of 100 200 and 800 Volts may be performed using only the discharge through a short to ground A photograph or printout of the waveforms is required Figure 4 0 6 shows the waveform requirements for the discharge through a short to ground at 400 Volts and Figure 4 0 8 shows the waveform requirements through the 500 Ohm resistor to ground The MM capacitor module is keyed so when MM testing is selected the HI RANGE is disconnected and only the LO RANGE can be used This allows MM testing from less than 20 Volts to 2000 Volts THE LEA
25. ity Mode Two indicators are provided to show which polarity has been selected An illuminated GREEN light indicates that the output 10 discharge pulse will be POSITIVE relative to system ground while AMBER indicates that the pulse will be NEGATIVE Like the High Voltage mode indicators the polarity may be changed via the High Voltage Polarity select switch only if the High Voltage ON OFF switch is in the OFF up position Charging Discharge Indicators Two indicators are provided to display the Charge Discharge status of the Simulator When the GREEN Charge indicator is illuminated the internal circuits are in the Charge mode allowing the capacitor to be charged to the desired voltage level The AMBER Discharge light will flash when a discharge cycle is taking place the capacitor is connected to the OUTPUT terminal Numeric Displays Charging Voltage This 31 2 digit LED display shows the actual high voltage level and polarity applied to the capacitor In the LO Voltage Mode GREEN LO V indicator on the readout indicates the charging voltage directly in Volts In the HI Voltage Mode AMBER HI kV indicator on a decimal point will appear on the display and the charging voltage will be displayed in kilovolts In the LO 0 to 2kV Voltage Mode the readout displays a maximum level of 1 999 Volts If the operator sets the Charging Voltage to a level above this maximum the readout will blank out indicating an ove
26. lacing the High Voltage ON OFF switch in the OFF up position This last function is to ensure no discharges occur after the test and for safety when high voltages are being used The function can be omitted if required To resume testing turn on the High Voltage if necessary re adjust the FINE control set the COUNT HOLD button to COUNT and when ready depress the DISCHG button AUTOMATIC Mode In the Automatic Mode the operator selects the number of discharge pulses desired and the interval between pulses Upon depression of the RESET then the DISCHG buttons the Simulator proceeds to automatically generate the selected number of pulses at the chosen interval The HOLD button may be used to hold the count at any time before the selected count is reached To operate the Automatic Mode follow the set up procedures in 3 1 and 3 2 then proceed as described in the following sub paragraphs AUTOMATIC Mode Selection Set the MAN AUTO switch to the AUTO down position The AUTO Mode numeric indicator will now be illuminated 17 3 2 6 INTERVAL Adjustment The INTERVAL adjust control which provides for setting the cool down time interval between discharges is an uncalibrated control and if accurate timing is required must be calibrated against an external reference e g digital watch stopwatch with sweep hand etc To accurately set the INTERVAL control turn off the internal High Voltage Supply by setting the High Voltage
27. lay has an intrinsic capacitance of approximately 50pF hence SOpF of Capacitance is added internally to obtain the specified 100pF The plug in capacitor module labeled 100pF contains no additional capacitors It may be used to obtain other capacitance values above 100pF The MM consists of a total of 200pF capacitance that is discharged through 0 Ohms to the DUT The capacitor module labeled 200pF contains 100pF of capacitance that adds to the 100pF already built into 13 3 1 2 the system The plug in OQ resistor is just a shorting bar that plugs into the output jack This network plus associated test leads are shown in Figure 3 0 1b b MM discharge network Figure 3 0 1 HBM and MM discharge networks IEC 61000 4 2 Network a HBM discharge network This network consists of 150pF discharged through 3309 Both the R and C components are connected in series within the module shown in Figure 3 0 2 The added 50pF capacitance described in Section 3 1 1 is must removed from the discharge relay input and moved into the individual modules Both HBM and MM modules now include an additional 50pF capacitance and are labeled 100pF Special and 200pF Special respectively The 0Q MM resistor is plugged into the OUTPUT jack to complete the network Figure 3 0 2 IEC 61000 4 2 RC network module and HBM amp MM Special 3 1 3 Test Fixture and DUT Installation Install the appropriate Test Fixture by pressing it gently int
28. letely integrated unit that provides the means of performing both direct charge and field induced CDM tests IMPRORTANT NOTE The Model 9903 only provides the means to perform CDM testing It does not produce verification waveforms that meet all the requirements specified in the test standards referenced above J SH j D CHARGE DEVICE MODEL TEST FIXTURE i ci ae i E Figure 5 0 4 Model 9903 Charge Device Model Test Fixture 11 12 27 6 0 WARRANTY Electro Tech Systems Inc warrants its equipment accessories and parts of its manufacture to be and remain free from defects in material and workmanship for a period of one 1 year from date of invoice It will at it s discretion either replace or repair without charge F O B Glenside similar equipment or a similar part to replace any equipment or part of its manufacture which within the above stated time is proved to have been defective at the time it was sold All equipment claimed defective must be returned properly identified to the Seller or presented to one of its agents for inspection This warranty only applies to equipment operated in accordance with Seller s operating instructions Seller s warranty with respect to those parts of the equipment that are purchased from other manufacturers shall be subject only to that manufacturer s warranty The Seller s liability hereunder is expressly limited to repairing or replacing any parts of the equipment m
29. nsitive parts or containers of ESD sensitive parts The variation in human body resistance is due to factors such as the amount of moisture salt and oils at the skin surface skin contact area and pressure A value of 1 500 ohms provides a reasonable lower human body resistance value In view of the above Mil Std 883E specifies a Human Body Model HBM using 100 pf discharged through 1 500 Ohms For power sensitive parts a change to a worst case Human Body Model capacitance i e greater than 100 pf could result in damage to ESD sensitive parts at voltage levels below those shown in Mil Std 883E Appendix 1 Therefore a component that has been classified as non ESD sensitive could actually become ESD sensitive under more stringent Human Body Model conditions For voltage sensitive ESD parts a variation in the capacitance value in the test circuit generally will not affect ESD sensitivity However a decrease in Human Body Model resistance will increase the voltage and power delivered to the e part that could adversely affect voltage and power sensitive ESD sensitive parts at lower HBM voltage levels The Human Body Model specified is considered a reasonable test circuit for evaluating the sensitivity of ESD sensitive parts because personnel are generally the most common source of damaging ESD The Model 910 Electrostatic Discharge Simulator is an instrument specifically designed to simulate the electrostatic discharge produced by human handling and
30. o the four mounting jacks located on the sloping panel When using the Standard Universal Clamp Test Fixture shown in Figure 3 0 3 HBM Testing secure the device under test DUT to the holding fixture on the Test Fixture using the spring loaded clamp 14 Adjust the sliding post to provide the proper spring loaded force on the DUT When properly adjusted the DUT will be securely held and is removed by sliding the spring loaded portion of the holding fixture to the right CAPACITOR GND Spring loaded Clamp ee Adjustable Clamp Figure 3 0 3 Universal Clamp Test Fixture HBM When using one of the optional socketed DIP type DUT Test Fixtures shown in Figure 3 0 4 move the lever up to insert the package then move the lever down to lock the pins in place For SOIC flat pak and other multi pin arrays follow the instructions supplied with the respective test socket CURVE TRACER OUTPUT Figure 3 0 4 40 pin DIP Socket Test Fixture HBM 15 3 1 4 Connecting Discharge Leads to DUT Plug the red minigrabber test lead into the red OUTPUT jack and the black minigrabber test lead into the black GND jack If a curve tracer or other test instrument is to be used to check the characteristics of the pin pair of the DUT before and after a discharge sequence plug the Curve Tracer input lead into the CURVE TRACER OUTPUT banana jack on the Model 910 Discharge Panel For HBM use the leads with the black tubing at the plug end For
31. other liquid penetrates the equipment unplug the power cord and contact the factory for further instructions Continuous use in this case may result in electrical shock fire or permanent damage to the equipment DO NOT OPERATE IN HIGH HUMIDITY Operating the equipment in high humidity conditions will cause deteriation in performance system failure or present a shock or fire hazard Contact the factory for further instructions DO NOT OPERATE IN AREAS WITH HEAVY DUST Operating the equipment in high dust conditions will cause deteriation in performance system failure or present a shock or fire hazard Contact the factory for further instructions DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE Operating the equipment in the presence of flammable gases or fumes constitutes a definite safety hazard For equipment designed to operate in such environments the proper safety devices must be used such as dry air or inert gas purge intrinsic safe barriers and or explosion proof enclosures DO NOT USE IN ANY MANNER NOT SPECIFIED OR APPROVED BY THE MANUFACTURER Unapproved use may result in damage to the equipment or present an electrical shock or fire hazard MAINTENANCE and SERVICE CLEANING Keep surfaces clean and free from dust or other contaminants Such contaminants can have an adverse affect on system performance or result in electrical shock or fire To clean use a damp cloth Let dry before use Do not use detergent alcohol or antistatic cle
32. r of discharge pulses is produced A HOLD button halts the test sequence in the Automatic mode or prevents an unintentional discharge in the Manual mode ee RGE D ula ror waren Figure 2 0 1 Model 910 ESD Simulator with optional CDM Indicator lights on the front panel display the mode selected the status ON or OFF of the high voltage power supply output and the charge discharge state of the unit A single digit LED readout indicates the number of discharge pulses produced in the Automatic mode and is extinguished in the Manual mode Adapter modules are available for holding a wide variety of devices and providing for their connection to the OUTPUT terminals of the Discharge simulator Standard with the Model 910 is a universal holding fixture that retains the device under test DUT so the minigrabber test leads can be connected to the appropriate pin pair as shown in Figure 2 0 2 Standard test fixtures with zero insertion force test sockets for DIP and SOIC type packages shown in Figure 2 0 3 are also available as accessories along with custom designed fixtures for special applications These test fixtures feature programming pins for tying groups of like V signal and ground pins together as required in many specifications 2 2 DIP 40 3 6 Adj SOIC 16 SOIC 28 Figure 2 0 3 Socketed DUT test fixtures A front panel accessible calibration adjustment is provided to allow the user to calibrate the digital panel m
33. rscale condition This is normal and the readout will not be damaged by settings above the 1 999V Testing above 1 999V requires switching to the HI Voltage Mode AUTO MODE Count Indicator This display is a single digit LED numeric readout that displays the discharge pulse count in the Automatic mode In the Manual mode this indicator is not illuminated When the RESET switch is depressed the AUTO mode count indicator will reset to zero and hold this count until the discharge cycle is started Once the discharge cycle is started the AUTO mode count indicator will automatically increase its count by one for each discharge pulse produced Upon reaching the count set on the DISCHARGES selector automatic test cycling is ended and the AUTO mode indicator will hold the final pulse count until the RESET button is depressed lf during an automatic test cycle the HOLD button is depressed the AUTO mode pulse counter will display the total number of discharges produced up to the time the HOLD button was depressed If the HOLD button is then placed in the COUNT up position and the DISCHARGE button is depressed the test cycle will resume and the remaining pulses as set on the DISCHARGES control will be produced II 2 3 2 2 4 Output Panel The Output Panel shown in Figure 2 0 7 is located on the right side of the instrument and contains the RESISTOR CAPACITOR GROUND and CURVE TRACER output jacks The R C modules are easily replaced b
34. selector At this time the test is concluded the Simulator automatically stops generating output discharge pulses and the AUTO mode readout displays the final count of the number of discharges produced Nothing further will occur unless the operator wishes to repeat the test sequence To do this momentarily depress the RESET button then depress the DISCHARGE button The automatic discharge cycle will be repeated Upon completion of testing set the High Voltage switch to OFF up Interrupting AUTO Mode Count To stop the discharge pulses in the AUTO mode before the full count is reached two 2 methods may be used HOLD Button If the HOLD button is depressed while automatic testing is in progress and the full count as set on the DISCHARGES control has not yet been reached AUTO mode indicator 18 DISCHARGES setting the discharge pulses will be stopped and the AUTO mode indicator will hold the discharge pulse count as produced up to that point To complete the unfinished count set the COUNT HOLD button to COUNT and then depress the DISCHARGE button Unless the DISCHARGE button is depressed after the COUNT HOLD button is set to COUNT the automatic discharge sequence will not be resumed RESET Button If the RESET button is depressed while the automatic discharge Is in progress the AUTO mode count will immediately reset to zero and upon release of the RESET button and depression of the DISCHARGE button the discharge sequence w
35. the desired output pulse polarity up for positive down for negative High Voltage ON Depress this pushbutton to turn on the high voltage 16 3 2 3 3 2 4 3 2 9 High Voltage Level Adjustment Rotate the FINE adjust control clockwise until the pointer is in the twelve o clock position Rotate the COARSE adjust control clockwise until the approximate desired voltage level is indicated on the CHARGING VOLTAGE readout Now re adjust the FINE control to trim the voltage reading to the final level Allow several seconds for the reading to stabilize then if necessary re adjust the FINE control The unit is now ready to produce the desired output pulse MANUAL Mode In the MANUAL mode AUTO MAN button in MAN up position the operator is in complete control of the number of pulse discharges and the interval to be impressed on the DUT To operate the Discharge Simulator in this mode follow the above procedure then proceed as described below Discharge Pulse Generation With the COUNT HOLD button to the COUNT up position depress the DISCHG button once each time a high voltage discharge pulse is required The Amber DISCHARGE indicator will flash each time an output pulse is produced At least one second should be allowed between pulses for the cool down period After the DUT has been subjected to the desired number of pulses place the COUNT HOLD button in the HOLD down position and turn off the high voltage supply by p
36. to the desired level The FINE adjust control is used for precise setting of this level The adjustment range of the FINE control is approximately 600 volts thus if this control is set to its mid position 12 o clock before the COARSE control is set it will allow the output level to be adjusted by approximately 300 Volts about the COARSE control setting 2 2 3 Operating Mode Controls LO and HI Ranges Manual Mode Manual Auto Mode Select This push push switch when in the MAN up position places the unit in the MANUAL mode The AUTO mode numeric indicator will be extinguished in this mode DISCHARGE Control Manual Mode This momentary push button switch causes the Simulator to produce one discharge pulse each time it is depressed In this mode the user should allow a minimum of about one 1 second between discharge pulses If the discharge button is depressed more rapidly than once per second an incomplete discharge cycle may be produced HOLD Button This push push switch when in the COUNT up position allows one discharge pulse to be produced with each depression of the DISCHARGE button When placed in the HOLD down position the Simulator is prevented from producing an output discharge pulse This button should normally be left in the HOLD down position except when tests are being conducted Using this control in this manner will insure that output pulses are obtained only when required and not at other times such as pow
37. y unplugging them from the panel The CURVE TRACER output is a standard banana jack that is connected to a high voltage relay When the system is in the Charge mode the relay is closed connecting the CT output to the Discharge Resistor This connects the CT output to the pin under test When the system is in the Discharge mode the relay opens thereby disconnecting the CT output from the DUT It again closes when the system returns to CHARGE This enables the user to check the DUT both prior to and after a discharge without removing any connectors NOTE The CURVE TRACER output is not connected when shipped from the factory If the user wants to use this function the top cover must be removed and the CT 040 pin must be plugged into the 040 jack located on top of the discharge relay DO NOT USE ABOVE 5kV Induced voltages may damage the Curve Tracer User must determine suitability before using PULSE OUTPU CAPACITOR GND Figure 2 0 7 Output Panel Rear Panel The rear panel is shown in Figure 2 0 8 It contains the input power module Mains with fuse and a standard 0 160 4mm banana for ground The Power module accepts the standard IEC power cord REMOTE DISCHARGE Optional This feature enables the Model 910 to have a computer or other remote trigger source to control the DISCHARGE cycle It can only be used in the MANUAL mode A 5 pin Din connector is installed for the optional remote discharge It requires a
Download Pdf Manuals
Related Search