Atlas SCR User Guide
Contents
1. 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 3 Page 10 Atlas SCR User Guide January 2008 Rev 3 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 1S 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 ora good quality 12V alkaline equivalent as used in many test instruments and automotive remote key fobs Battery 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 Batte2. for quadrant 3 Quadrant 1 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 a 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 January 2008 Rev 3 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 January 2008 Rev 3 Notes on SCRs and Triacs Triacs Triacs are a well established technology designed specifically for the solid state control of AC loads They offer bi directional load current switching for both half cycles of the mai
3. 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 2008 Peak Electronic Design Limited E amp OE West Road House 26a West Road Buxton Derbyshire SK17 6HF UK www peakelec co uk Tel 44 0 1298 70012 Fax 44 0 1298 70046 Page 15
4. Atlas SCR Thyristor and Triac Analyser Model SCR100 Peak Electronic Design Limited 2004 2008 In the interests of development information in this guide is subject to change without notice E amp OE CE PEAK electronic design Itd Atlas SCR User Guide January 2008 Rev 3 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 PEP OCUCUION wsuaitisstetrad ates a isusatedastetadeseuiat ata tnidantsbuatsasadeaexeuacs 3 Safety C ONSICEALONS incase tatscaataniancirimhecnectiud Mustetantateseniies 4 ATGIY SINS COMPONE DIS he Ei 5 CIR raa ia T A A 6 EAC iore E OTE O E 1 Notes on SCRs Thyristors and Triacs cccscssseeeeeeees 8 Gate DCNSIE VIGY scsnaids TEE 10 Care Of YOUE Alas SCR oeni E AEAEE 1 Battery Replacement zaa AA 11 SEIE TE S So ea E EOE O 12 Appendix A ACCESSOLICS ccccccccccccccceeeeeeesssssseeeeeeeees 13 Appendix B Technical Specifications 14 Warranty Information eenaa a 15 Page 2 Atlas SCR User Guide January 2008 Rev 3 Introduction The Atlas SCR is an advanced instrument designed specifically for the analysis of SCR Thyristor and Triac devices Summary Features e Automatic component identification e Automatic pinout identification e Displays actua
5. econd 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 January 2008 Rev 3 Silicon Controlled rectifiers SCRs The Atlas will analyse almost any SCR provided that a gate trigger G current of no more than 90mA is 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 curre nt current the actual measured trigger current may be well below that value c 50
6. ior is ideal for protecting your Atlas SCR and probes There is even space for a spare battery Replacement Probes If your probes become damaged you may wish to purchase a new set of probes or alternatively fit a different style of probes Replacement Battery Replacement batteries are available from Peak Electronic Design Limited your agent or many good electronic stores All accessories are available from Peak Electronic Design Limited or an authorised agent Page 13 Atlas SCR User Guide January 2008 Rev 3 Appendix B Technical Specifications All values are at 25 C unless otherwise specified Parameter Minimum Typical Maximum Note Peak testcurrentintoS C_ 100mA 120mA Peak test voltage acrossO C_ 120v SV Gate trigger current range lor Olma 90mA Oo Battery voltage range 85v 12V J Battery voltage warning threshold ere e taI Acti pinot down petal e 2 ses for e tee 0 C 1 Between any pair of test clips 2 Subject to acceptable LCD visibility Page 14 Atlas SCR User Guide January 2008 Rev 3 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
7. l trigger gate current classification e Fixed load current of 100mA e Device test voltage of 12V regardless of battery condition e Suitable for devices requiring gate currents up to 90mA e Automatic and manual power off Page 3 Atlas SCR User Guide January 2008 Rev 3 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 January 2008 Rev 3 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 test button is pressed Analysing The analysis typically takes less than a s
8. ns 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 eget ess handled by the connections MT 1 and MT2 The device is switched to the on state by a MT2 me current into or out of the gate terminal with respect to ar TL Ay the MT1 terminal pan MT1 i MT1 Once triggered main load Quadrant 3 Quadrant 4 current will continue to flow until a zero cross in the mains cycle is encountered ke at this point the device av switches off Therefore if the GT ops device is to be kept on a ae MT 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 January 2008 Rev 3 Gate Sensitivity The Peak Atlas SCR attempts to trigger the device under test at eight discrete gate currents in ascending order Trigger test level 2 500uA Last test First test Thus for example
9. ry 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 January 2008 Rev 3 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 If there is a low battery condition the automatic self test procedure may not be performed Page 12 Atlas SCR User Guide January 2008 Rev 3 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 exter
10. to 75mA 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 2 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 Page 6 Atlas SCR User Guide January 2008 Rev 3 MT2 Triacs 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 message will be displayed Details follow Note The device under test will be analysed in quadrants 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 25 to 50mA trigger current the actual measured trigger current may be well below that value Trigger current The gate trigger current displayed is that
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