The Peak Atlas SCR rev 1 User Guide
Contents
1. that value Trigger current The gate trigger current displayed is that for quadrant 1 Quadrant 3 will usually be very similar The load current at which the Triac was tested is also displayed This value is fixed for all devices and simply serves as a reminder The ue symbol indicates that this is the final page of information Pressing the scroll off button again will return the display to the first page of information Note 1 See the Gate Sensitivity section later in this guide Page 7 Atlas SCR User Guide September 2004 Rev 1 Notes on SCRs and Triacs Silicon Controlled Rectifiers SCR Turn On SCRs Thyristors act as a controlled diode They block reverse current at all times and they conduct in the forward direction only when triggered by a pulse of current to the control gate terminal Once triggered the SCR will continue to conduct current in the forward direction until the device is turned off SCR Turn Off In order to turn off a triggered SCR it is necessary to reduce the main terminal current below the holding current for typically 5 200uS Shorter periods may leave insufficient time for free charge carriers to recombine and thus when main current is reapplied the device may remain triggered Page 8 Atlas SCR User Guide September 2004 Rev 1 Notes on SCRs and Triacs Triacs Triacs are a well established technology designed specifically for the solid state control of AC l2. Atlas SCR Thyristor and Triac Analyser Model SCR100 Peak Electronic Design Limited 2004 In the interests of development information in this guide is subject to change without notice E amp OE CE Atlas SCR User Guide September 2004 Rev 1 Want to use it now We understand that you want to use your Atlas SCR right now The unit is ready to go and you should have little need to refer to this user guide but please make sure that you do at least take a look at the notices on page 4 Contents Page PO CUICU OT renean iranian atiadasbenndters 3 Safety Considerati n S aeoiee i E EEE 4 Analysing COMP ON EMS wi scsessscecssevcsedsossshesvenetoodeatesvesseveseess 5 SOCR Staa a a teathecer meeuaudtae 6 TENS AE EEE E E T E E AA E 7 Notes on SCRs Thyristors and Triacs cccccceeeeeeeeeees 8 Gate CMS UL VIN castes cantiee cue ated a cult dein tae aed Gk 10 Care OF your Atlas SC Rekreoren a a encoded Gib 11 Battery R placement esencia ele rtens tdi 11 S12 UB oh een eee cre perenne E 12 Appendix A ACCESSOTSIECS ccccccceeeeeeeeeeeeeeeeeeeeeeeeeeees 13 Appendix B Technical Specifications eeeeeee 14 Warranty Information 0ccccccccceceeeeeeseeeeeeeeeeeeeeeeees 15 Page 2 Atlas SCR User Guide September 2004 Rev 1 Introduction The Atlas SCR is a capable instrument designed specifically for the analysis of SCR Thyristor and Triac devices Summary Feature
3. der Trigger test level 1 100uA Trigger test level 2 Trigger test level 3 Trigger test level 4 Trigger test level 5 Trigger test level 6 First test Trigger test level 7 Last test Trigger test level 8 Thus for example a reported trigger current of 10mA means that device triggering occurred at a gate current of 10mA but not at 2 5mA Therefore the trigger current for the device under test is between 2 5mA and 10mA Although Triacs are tested in both quadrants 1 and 3 the reported gate trigger current for both SCRs and Triacs is that which applies to quadrant 1 Page 10 Atlas SCR User Guide September 2004 Rev 1 Care of your Atlas SCR The Peak Atlas SCR should provide many years of service if used in accordance with this user guide Care should be taken not to expose your unit to excessive heat shock or moisture Additionally the battery should be replaced at least every 12 months to reduce the risk of leak damage If a low battery warning message Low Batter y appears replacement of the battery iS mandatory The Atlas will not continue to operate if this condition is encountered New batteries can be purchased from many retailers and directly from Peak Electronic Design Ltd or an authorised agent Battery types Suitable battery types include 23A V23A GP23A MN21 or a good quality 12V alkaline equivalent as used in many test instruments and automotive remote key fobs Bat
4. med Page 12 Atlas SCR User Guide September 2004 Rev 1 Appendix A Accessories A range of useful additions is available to enhance your Atlas SCR Carry Case A specially designed case with custom made foam compartments and a smart tough exterior is ideal for protecting your Atlas SCR and probes There is even space for a spare battery Crocodile Clips Long Reach Grabbers and other probes Other probe types are available for your Atlas SCR to allow for the easy testing of a variety of component packages Fitting is easy because these accessories are terminated in the standard Atlas SCR probe connectors All accessories are available from Peak Electronic Design Limited or an authorised agent Page 13 Atlas SCR User Guide September 2004 Rev 1 Appendix B Technical Specifications All values are at 25 C unless otherwise specified Parameter Minimum Typical Maximum Peak testcurrentintoS C_ l00mA 120mA 1 Peak test voltage acrossO C_ 120v 125v 1 Gate trigger current range lor Olma 90ma Battery type GP23A12V Alkaline an e sv gv i Battery voltage warning threshold __ ssy Tnactivity power down period 0 seus 2 voce for single soreen Waulls __ Dimensions excluding testleads 103x 0x20mm Operating temperature range oc oc 7 1 Between any pair of test clips 2 Subject to acceptable LCD visibility Page 14 Atlas SCR Use
5. oads They offer bi directional load current switching for both half cycles of the mains supply and also bi directional gate current capability to trigger the device The combinations of the load currents and gate control currents are referred to as quadrants These quadrants are shown below MT2 Positive positive half cycle The main load current is bail Bias handled by the connections MT1 and MT2 The device is switched to the on state by a MT2 ae current into or out of the gate terminal with respect to GT a 2 E the MT1 terminal Ea MT1 MT1 i Once triggered main load Quadrant 3 Quadrant 4 current will continue to flow until a zero cross in the mains cycle is encountered me at this point the device a AY switches off Therefore if the T JL device is to be kept on a ay MTI continuous gate current must be provided or at least a gate MT2 Negative negative half cycle current pulse that occurs immediately after each mains zero cross Many triacs however are only capable of operating reliably in 3 of the 4 quadrants In particular Q1 Q2 and Q3 Quadrant 4 negative gate current and negative load current can be troublesome with some triacs suffering from poor gate sensitivity and slow response Page 9 Atlas SCR User Guide September 2004 Rev 1 Gate Sensitivity The Peak Atlas SCR attempts to trigger the device under test at eight discrete gate currents in ascending or
6. r Guide September 2004 Rev 1 Warranty Information Peak Satisfaction Guarantee If for any reason you are not completely satisfied with the Peak Atlas SCR within 14 days of purchase you may return the unit to your distributor You will receive a refund covering the full purchase price if the unit is returned in perfect condition Peak Warranty The warranty is valid for 12 months from date of purchase This warranty covers the cost of repair or replacement due to defects in materials and or manufacturing faults The warranty does not cover malfunction or defects caused by a Operation outside the scope of the user guide b Unauthorised access or modification of the unit except for battery replacement c Accidental physical damage or abuse The customer s statutory rights are not affected by any of the above All claims must be accompanied by a proof of purchase At Peak Electronic Design Ltd we are committed to continual product development and improvement The specifications of our products are therefore subject to change without notice 2004 Peak Electronic Design Limited E amp OE Atlas House Kiln Lane Harpur Ind Est Buxton Derbyshire SK17 9JL UK www peakelec co uk Tel 44 0 1298 70012 Fax 44 0 1298 70046 Page 15
7. s e Automatic component identification e Automatic pinout identification e Displays actual trigger gate current classification e Fixed load current of 100mA e Suitable for devices requiring gate currents up to 90mA e Automatic and manual power off e Interchangeable probe sets Page 3 Atlas SCR User Guide September 2004 Rev 1 Safety Considerations WARNING This instrument must NEVER be connected to powered equipment components or equipment components with any stored energy e g charged capacitors Failure to comply with this warning may result in personal injury damage to the equipment under test damage to the Atlas SCR and invalidation of the manufacturer s warranty Analysis of discrete unconnected components is recommended The Atlas SCR is designed to provide accurate and reliable information for the majority of supported component types SCRs and Triacs as described in the technical specifications Testing of other component types or component networks may give erroneous and misleading results Page 4 Atlas SCR User Guide September 2004 Rev 1 Analysing Components The Peak Atlas SCR is designed to analyse discrete unconnected unpowered components This ensures that external connections don t influence the measured parameters The three test probes can be connected to the component any way round The Atlas SCR will start component analysis when the on est button is pre
8. ssed Analysing The analysis typically takes less than a second to complete after which the results of the analysis are displayed Information is displayed a page at a time each page can be displayed by briefly pressing the scroll off button If the Atlas SCR cannot recognise the component connected to the test probes or the component under test is outside the specifications covered by this instrument the following message will be displayed No SCR or Triac detected Note The arrow symbol on the display indicates that more pages are available to be viewed Page 5 Atlas SCR User Guide September 2004 Rev 1 Silicon Controlled rectifiers SCRs a The Atlas will analyse almost any SCR with the proviso that a gate G K trigger current of more than 90mA is not required The three test clips can be connected to the device under test any way round If SCR detected the Atlas detects an SCR the following Details follow message will be displayed RED GREEN BLUE Pressing the scroll off button will then display the pinout details for the device Anod Cath Gate In this example the Anode of the SCR is connected to the Red test clip the Cathode is connected to the Green test clip and the Gate terminal is connected to the Blue test clip The gate trigger current is displayed on the next screen Note that SCRs are often only specified to have a certain maximum trigger Tri gger current curren
9. t the actual measured trigger current may be well below that value G 50mA The load current at which the SCR was Tested at a load tested is also displayed This value is fixed for all devices and simply serves as a reminder The 1 symbol indicates that this is the final page of information Pressing the scroll off button again will return the display to the first page of information current Page 6 Atlas SCR User Guide September 2004 Rev 1 Triacs MT2 The Atlas will analyse almost any Triac with the proviso thata G MT1 gate trigger current of more than 90mA is not required The three test clips can be connected to the device under test any way round If the Triac detected Atlas detects a Triac the following l message will be displayed Details follow Note The device under test will be analysed in quadrants 1 and 3 The definition of these quadrants is given later in this guide Pressing the scroll off button will then RED GREEN BLUE display the pinout details for the device MT1 MT2 Gate In this example the MT1 terminal of the Triac is connected to the Red test clip the MT2 terminal is connected to the Green test clip and the Gate terminal is connected to the Blue test clip The gate trigger current is displayed on the next screen Note that Triacs are often only specified to have a certain maximum G 25mA trigger current the actual measured trigger current may be well below
10. tery access To replace the battery unscrew the three screws to remove the rear panel Remove the old battery and insert a new one taking care to observe the correct polarity Carefully replace the rear panel do not over tighten the screws Peak Safe Battery Disposal Scheme Please return your old analyser battery to Peak Electronic Design Ltd for safe and environmentally responsible disposal Page 11 Atlas SCR User Guide September 2004 Rev 1 Self Test Procedure Each time the Atlas SCR is powered up a self test procedure is performed In addition to a battery voltage test the Atlas measures the performance of many internal functions such as the voltage and current sources amplifiers analogue to digital converters and test lead multiplexers If any of these function measurements fall outside tight performance limits a message will be displayed and the Atlas will switch off automatically If the problem was caused by a temporary condition such as applying Error M6 power to the test clips then simply restarting the Atlas may clear the problem If a persistent problem does arise it is likely that damage has been caused by an external event such as excessive power being applied to the test clips or a large static discharge taking place If the problem persists please contact us for further advice quoting the displayed fault code 4 If there is a low battery condition the automatic self test procedure may not be perfor
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