AVR-3-PW-C-P-TEK2edi - Avtech Electrosystems Ltd.
Contents
1. 1 1 3 4 5 PAD n n n n n n T n n n n E n 1 11 a an 1 C16 1 1 m 1 11 1 14 11 Sh J oaf vur onifa HR D L 4 113 4 TO FRONTPANEL c it 5 1 11 got mgt gu ir TTTS u gt USED qs T CETTE 01 H 2 3 1 012 1 2 i EIE T n i TER 1 118 n 9 5 TO TRIG BNC GND Agte Ur 0 5 Ho No 1 59 1 Title p AVR 3 PW C P TEK2 SIMPLIFIED COMPACTED VERSION OF PCB 808 Tire Revisa DULL 8 Date 21 Jun 2009 Fi jelleslpebiS2Uek pchm ddh Documents 157 sch i MAIN WIRING2. hits LEHEL 010 IN P cu P deena 15 n ap J use OND T lite ix diy DC DE OND RTI GND t 15 S 0AT aF Rd USED cass pO daa pe 2 C dip at NOT USED m T LI USED pF Es BON T UND C2980 cm 152A gt C22 523 A 2 eO 22 DC p gt m DEAD IN borrow view CHS GND EXTERNAL AVX TEK2 SB1 SHORTING BAR Tine AVR 3 PW C P TEK2 Date Revista 24 Jun 2009 Lim jetile ste irc u its la VEN V V R N D di AVRA PW C P TEK2Wiring pebm Y Lsch PERFORMANCE CHECK SHEET 30
3. 4 5 i 1 1 1 1645180 2 PIN SOCKET ON BOTTON 16 1 D 111415 vy 0 2 PIN SOCKET ON BOTTOM GND our our Pot 1 PI N SOCKET BOTTON 4 11612 3 50 13 PIN SOC BOTTOM T 1 3 05 14 0 taav 14937 EEV ER SE T ENABLE 2 AMP IN 110 04 n KEEP PINS 1 2 WELL SEPARATED FRON PINS 4 m Roda 110 0 via Lo 1 CIT 1 Y a 1 1 H0 GN 1111 4 i 1 1111506 14 mE 1 1 CC EQVIIIS 2 ONLY H T ONLY T T 1 OK TO 600 500V It 1 i N 4 i 4 101 4 zz 141 1 4 1 s i 8 21 1 NUTAND BOLT H3 LEVERSE FO Y N44 Y 11 114 11 lf J 4 1 EII 100 BOLT 1 14 THT HY WARNING EV WARNING The discharge circuitry is disabled by the 123 ifthe UV status pin indicates that the UV is current limiting This is ignored if the status pin is low because the PCB has disabled the UV Title The main solid state relay turns on ifthe voltage atthe UV outputis more than 5V lowerthan the voltage on the capacitorbanks This Wins ona
4. ELECTROSYSTEMS LTD AVTECH V an NANOSECOND WAVEFORM ELECTRONICS SINCE 1975 265 TEL 888 670 8729 USA 4 Canada 1 613 686 6675 Intl BOX 5120 LCD MERIVALE OGDENSBURG NY FAX 800 561 1970 USA amp Canada or 1 613 686 6679 Intl OTTAWA ONTARIO U S A 13669 0265 CANADA K2C 3H4 info avtechpulse com http www avtechpulse com INSTRUCTIONS MODEL AVR 3 PW C P TEK2 0 TO 250 VOLT 0 TO 5 AMP PULSE GENERATOR FOR CURRENT PROBE TESTING SERIAL NUMBER WARRANTY Avtech Electrosystems Ltd warrants products of its manufacture to be free from defects in material and workmanship under conditions of normal use If within one year after delivery to the original owner and after prepaid return by the original owner this Avtech product is found to be defective Avtech shall at its option repair or replace said defective item This warranty does not apply to units which have been dissembled modified or subjected to conditions exceeding the applicable specifications or ratings This warranty is the extent of the obligation assumed by Avtech with respect to this product and no other warranty or guarantee 15 either expressed or implied TECHNICAL SUPPORT Phone 888 670 8729 USA amp Canada or 1 613 686 6675 International Fax 800 561 1970 USA amp Canada or 1 613 686 6679 International E mail info avtechpulse com World Wide Web http www avtechpulse com TABLE
5. CONTENTS WARRAIN EY derer E 2 TECHNICAL SUPPORT 2 iiti cx o tie e PD 3 INTRODUCTION amp SPECIFICATIOMNS 5 EUROPEAN REGULATORY NOTES i 6 EC DECLARATION OF CONFORMITY ciccsvescsisssccceeseseseestetsentccnsncecsencadsdeadsocedessncdissusdsescsedaeseoss 6 DIRECTIVE 2002 95 EC 6 DIRECTIVE 2002 9G EC WEEE 6 INSTALLATION e ee eim 8 VISUAL CHECK qe 8 POWER RATINGS 8 CONNECTION TO THE POWER SUPPLY 5 2 ier 8 PROTECTION FROM ELECTRIC risk etu he RI te onis 9 ENVIRONMENTAL 9 EE E PR TN 11 FUSE 11 DC FUSE REPLACEMENT 12 FUSE 12 FRONT PANEL S 13 REAR PANEL CONMOSS 16 GENERAL INFORMATION 17 TEST lS lc z ge 17 SHORTING T 17 MECHANICAL INFORMA TION eene pens as seu snae ERN Race uuo Dra odds 19 COVER REMOVAL 19 ELECTROMAGNETIC INTERFERENGCE oerte ook roihi ne ad 20e
6. 19 20 acum a rimi rre 20 eU cc 20 WIRING DIAGRAMS 21 WIRING OF AC POWER STYLE UN E Fea EY TRY Feo uae eaa bu gru 21 WIRING OF AC POWER STYLE 2 tei eee ees 22 158N LOW VOLTAGE POWER SUPPLY 113 23 158N LOW VOLTAGE POWER SUPPLY 23 eee eene entente nnno 24 158N LOW VOLTAGE POWER SUPPLY 3 3 s sscsssssssososesssccssssesssesseveessscveseseseues 25 157C HIGH VOLTAGE DC POWER 9 26 1528 OSCILLATOR AND TRIGGER CIRCUIT 12 27 1528 OSCILLATOR AND TRIGGER CIRCUIT 2 2 28 MANIRINe x 29 PERFORMANCE CHECK SHEET aes 30 Manual Reference fileserver officefiles instructword avr 3 AVR 3 PW C P TEK2edi odt Last modified June 24 2009 Copyright O 2009 Avtech Electrosystems Ltd All Rights Reserved INTRODUCTION amp SPECIFICATIONS Model AVR 3 PW C P TEK2 is a special order item which was custom designed for Tektronix for the testing of current probes such as the A6303 probe Specifications are as follows Model designation Description Output Amplitude Output pulse width Output connectors Rise fall time Max duty cycle Overshoot at max output Droop at max pulse width Chassis Other AVR 3 PW C P T
7. from 0 25 us to 250 us The minimum and maximum pulse width PW for each range and the corresponding maximum pulse repetition frequency PRF are as follows Note that the unit may fail if operated at duty cycles exceeding 0 25 PW min PW Range 1 0 25 us 2 5 us PRF max 10 kHz 2 5 kHz Range 2 2 55us 25 us PRF max 2 5 kHz 250 Hz Range 3 25us 250 us PRF max 250 Hz 25 Hz AMP Control This ten turn locking dial varies the output pulse amplitude from 0 to 250 Volts to 50 Ohms INT MAN EXT A EXT B Mode Switch With this switch in the INT position the repetition rate of the unit is controlled by an internal oscillator which in turn is controlled by the REPETITION RATE controls With the switch in the EXT A position the unit requires a 50 ns or wider TTL 15 level pulse applied at the TRIG input in order to trigger the output stages The output pulse width is set by the front panel controls in this mode With the switch in the EXT B position the unit requires a 0 25 250 us wide TTL level pulse applied at the TRIG input in order to trigger the output stages The output pulse width is equal to the input pulse width in this mode For a single pulse output the switch should be in the position and then push the SINGLE PULSE pushbutton 10 10 SINGLE PULSE Pushbutton When the INT MAN EXT A EXT B switch is in the MAN position the instrument can be triggered by pressing this pushbutto
8. EK2 The AVR 3 PW C TEK2 generates a 10 ns rise time voltage pulse 0 to 250 Volts 0 25 to 250 us which is accessible at the front panel OUT terminal A shorting bar is connected between the OUT and IN terminals and the current probe is placed over the shorting bar The IN terminal connects to ground via a 50 Ohm termination A variable current of up to 5 0 Amperes is defined by the 250 Volt pulse and the 50 Ohm termination For other applications the OUT terminal may be used to pulse a user supplied 50 Ohm load if desired In this case the shorting bar and the IN terminal are not used 0 to 250 Volts to gt 50 Ohms ie 5 amperes peak current Ten turn locking dial control 250 ns to 250 us 3 position range switch and ten turn fine control Two SMA connectors Output Shorting bar connects between two connectors Tektronix probe clips over this shorting bar lt 10ns 0 25 eg PRF max 25 Hz for PW 250 us lt 5 lt 2 3 9 x 17 x 14 8 See standard AVR 3 C pages 43 and 44 Cat No 11 Model AVR 3 PW C TEK2 is modelled on our standard product model AVR 3 C P see Cat 11 pages 43 and 44 or http www avtechpulse com speed avr 3 This instrument is intended for use in research and development laboratories EUROPEAN REGULATORY NOTES EC DECLARATION OF CONFORMITY We Avtech Electrosystems Ltd P O Box 5120 LCD Merivale Ottawa Ontario Canada K2C 3H4 declare that this pulse generator m
9. GRS 4022 0013 L3 Molex 19002 0009 0 187 x 0 032 Safety earth ground Primary earth ground TPVP103 24004 2 Protective conductor term inal CORCOM GEGGI 2POWERENTRY NODULE Molex 19002 0001 0 250 x 0 032 Molex 19073 0013 ring term inal 8 Installgreenlyellow wires at bottom of stack closest to wall Chassis ground post Secondary earth ground WIRE LENGTHS CM 2U 13 20 15 20 17 30 13 30 15 30 117 20 AWG ALPHA 3073 UL STYLE 1015 600 Vrms 62 GRNIYLW 20 5 20 5 20 5 28 28 28 63 GRNIYLW 20 5 20 5 20 5 23 23 23 20 AWG BELDEN 83008 M IL W 16878 4 600 Vrms AL BROWN 48 5 53 5 58 5 60 5 66 5 71 5 2 BLUE 46 5 51 5 56 5 61 66 71 BLACK 36 41 46 42 47 52 Ad WHITE 36 41 46 42 47 52 81 26 26 26 27 5 27 5 27 5 G1 GREEN 16 16 16 21 21 21 G4 GREEN 25 25 25 26 5 26 5 26 5 24 AWG BELDEN 35003 IL W 16878 4 600 Vrms C1 RED 23 5 23 5 23 5 25 25 25 C2 GRN 23 5 23 5 23 5 25 25 25 C3 PUR B 34 39 44 45 50 55 C4 GRN B 34 39 44 45 50 55 LED 4557 12 18 18 18 18 24 Title QC3HARNESS FOR PCBISBK Date Revision 20 May 2009 jcfilesipcbltS8lswitthing amp 0hz ddb USAGEIQC3 vS sch E 1 i i WIRING OF POWER STYLE 2 Do notattemptany repairs on this instrument Mains circuits hazardous live beyond the fuse replacement procedures described in the manu
10. MOSFET thatdischarges the capacitors through the high im pulse rated resis tors POSINEG DISCHARGER CIRCUIT Thesecond MOSFET supplies aconstant2 m bias to Matis switched between the 1N4937 SSR 1N4937 100 OHM depending on the voltage levels 2 24 Jun 2009 Revision Lm 57 discharge 157 15 seh 5 i PCB 1528 OSCILLATOR AND TRIGGER CIRCUIT 1 2 1 3 6 11 1 cew 1 qu D zi Uit Clr 11 D 541 any mnm EI Qr rt L ES 11 11 C1 TIAD 1360141 4 0 Al C1 t1 4 0 0 5 4 0 HX 0 12 EE ACA t es T 1 9 1 TRAN ot 4 97r 9 B4 E 9 1i SIMPLIFIED COMPACTED VERSION OF PCB 808 1 1 41 A Title i AVR 3 PW C P TEK2 PC BM HOT USED Size Number Revision 8 Date 24 Jun 2009 Other File Zim jelileslpchb 52 ddh Docum 2015 115205 C DLY sch i PCB 1528 OSCILLATOR AND TRIGGER CIRCUIT 2 2
11. O REAR SNIP OFF CONN TO USE SCREW TERMINALS LED ASSY 3 63 0K BUTRE POSITION 12 18 18 18 18 A3AL RE INSTALL CONN IN NEW ORIENTATION TUE WARNESS FOR PC BISON AAD a 5 BRACKETUNDER AAD INSTALL MESH UNDER FAN AND ON REAR PANEL m 01 n P385 ND LED 1 jcfilesipcblt58lswitching amp 0hz ddb USAGEIQC3 58 AAD sch i PCB 158N LOW VOLTAGE POWER SUPPLY 1 3 POISON switching QIPEN itching sch Title LOW VOLTAGE DCIDC POWER SUPPLY Da Revision 11 00 2008 Z n 158 ing GOhz ddb 15 sch i PCB 158N LOW VOLTAGE POWER SUPPLY 2 3 FUSER 61144 T e 1451 1001 E
12. PFECT 0 1 0845 H 1 1 4 z 4 4 41 100 18CTQUAD IN 194 ND 5711 11415114 111 40 y i 5i diro 0 411 4 01 S a S B 1 1 4 3 4 5 PM DISABLE t 1 2 14 m iT kd soray K21 8 ORM ALLY INSTALLED 110 151 SWITCHED BY 010 NORMALLY INSTALQED DISABLE ATPOWER ON IN 4145 i 1 F18V LAGS HY BY 500 s 11 1 1 OPT a Quin 1 1 1 i i 1 T gt i RESET T DISABLE OLOWHENCHARGING i A t CONT T 018 ino els ANY 15V NON CHOS 554 tis pit K 11 MOUNT KELSTONE G11 BRACKET 2 Te S A TEST LOO d 011 A CASH POT ACCESS Title OVER CURRENT PROTECTION SER Date Revision Z m SB iswiteh ing GO0h2 ddb 158Nlpcbl58N switching 1 1 3 4 i i PCB 157 HIGH VOLTAGE DC POWER SUPPLY
13. PROBE O USE CONTROLS 5 5 Ol ol 5 ah hr OA ko PROBE OVER ote pel POWER Switch This is the main power switch When turning the instrument there may be a delay of several seconds before the instrument appears to respond REPETITION RATE Controls When triggering internally the range switch sets the pulse repetition frequency of the internal oscillator to one of four range RANGE 1 1 Hz 10 Hz RANGE 2 10 Hz 100 Hz RANGE 3 100 Hz 1 kHz RANGE 4 1 kHz 10 kHz The FINE knob varies the frequency within each range DELAY Control Controls the relative delay between the reference output pulse provided at the TRIG output 4 and the main output 5 This delay is variable over the range of 0 25 to 250 us The TRIG output precedes the main output when the ADVANCE DELAY switch is in the ADVANCE position and lags when the switch is in the DELAY position TRIG Connector When the MODE switch item 9 is set to the EXT position a TTL level pulse applied to this connector will trigger the instrument The instrument triggers on the rising edge of this input The input impedance of this input is 1 kO Depending on the length of cable attached to this input and the source driving it it may be desirable to add a coaxial 50 Ohm terminator to this input to provide a proper transmission line termination The Pasternack www past
14. S i i t E t D 3 5 T tl a a T qued 6 OR TELA BYPASS NORMALLY 1 P LI Via Vout E z 4 Pe sy 7 1 0 DEM ALLY STALLED 4 E 009 H s 4 ajz 5 LE n Eee n IN n v np GND T itle i DCIDC A OVER VOLTAGE PROTECTION OUT HOM ALLY U N Date Revision SED VOT ISE mw 12 Dec 2008 Lm sip eb 5 15 ovpesch i PCB 158N LOW VOLTAGE POWER SUPPLY 3 3 1 3 4 i 6 111 IH 1 5K T il ve Lik ETT 1 hl vio NORMALLY INSTALLED SHORTS OUTBASE WHEN CHARGING NT PS NORM ALLY INSTALLED A C16 30035 EU SER DLDER 04 T 151 Yir 115 z N LARIOPFECT 0 1 ORMS EST LOOP HEN T vi 1 1 0 WLARIO
15. al ContactAyv tech if the instrument requires servicing Service is to be performed WARNING solely by qualified service personnel Ad WHITE POWER SWITCH SW 325 ND CW INDUSTRIES 685 4022 0013 Molex 19002 0009 0 187 x 0 032 802 PCBi04D KEYPAD BOARD BUNITS ONLY Safety earth ground Primary earth ground Protective conductor term inal TT Yt CORCOM GEGGI 2POWERENTRY NODULE Molex 19002 0001 0 250 x 0 032 C3 PUR Molex 19073 0013 ring term inal 8 Install greenlyellow wires at bottom of stack closest to wall Chassis ground post Secondary earth ground FAN N HARN P9768 ND WIRE LENGTHS CM 20 13 20 15 20 17 30 13 3U 15 30 17 20 AWG ALPHA 3073 UL STYLE 1015 600 Vrms 62 GRNIYLW 20 5 20 5 20 5 28 28 28 63 GRNIYLW i 20 AWG BELDEN 83008 MIL W 16878 4 600 Vrm s AL BROWN 4 5 53 5 58 5 60 5 66 5 71 5 AL BLUE 46 5 51 5 56 5 81 66 71 A3 BLACK 2 A4 WHITE 61 GREEN 16 16 16 21 21 21 64 GREEN USE TIE DOW N POINTON 158 14 BELDEN 83003 M IL W 16878 4 600 Vrms hs C1 RED NOTUSED Vcc Leo wount C2 GRN NOT USED CHANGES RELATIVE TO TPVP VERSION C3 PUR 34 39 44 45 50 55 1 SNIP OFF C1 C2 SENSE WIRES ENTIRELY C4 GRN B 34 39 44 5 50 55 2 81164 T
16. ations the OUT terminal may be used to pulse a user supplied 50 Ohm load if desired In this case the shorting bar and the IN terminal are not used SHORTING BAR The shorting bar allows a Tektronix current probe to be clamped around it The current bar is reversible it may be installed in either orientation A photo of the shorting bar is shown below 18 The next photo shows the shorting bar installed with a Tektronix A6303 current probe clamped to it Note that the probe is upside down in order for the probe to sense a positive current 19 MECHANICAL INFORMATION TOP COVER REMOVAL If necessary the interior of the instrument may be accessed by removing the four Phillips screws on the top panel With the four screws removed the top cover may be slid back and off Always disconnect power cord and allow instrument to sit unpowered for 10 minutes before opening the instrument This will allow any internal stored charge to discharge There are no user adjustable internal circuits For repairs other than fuse replacement please contact Avtech info avtechpulse com to arrange for the instrument to be returned to the factory for repair Service is to be performed solely by qualified service personnel Caution High voltages are present inside the instrument during normal operation Do not operate the instrument with the cover removed ELECTROMAGNETIC INTERFERENCE To prevent electromag
17. e power cord that is supplied with the instrument plugs into this socket The other end of the detachable power cord plugs into the local mains supply Use only the cable supplied with the instrument The mains supply must be earthed and the cord used to connect the instrument to the mains supply must provide an earth connection The supplied cord does this Warning Failure to use a grounded outlet may result in injury or death due to electric shock This product uses a power cord with a ground connection It must be connected to a properly grounded outlet The instrument chassis is connected to the ground wire in the power cord The table below describes the power cord that is normally supplied with this instrument depending on the destination region European CEE 7 7 Continental Europe Schuko 230V 50Hz Qualtek http www qualtekusa com 319004 01 United Kingdom Be 1707 Qualtek http www qualtekusa com 370001 01 230V 50Hz 1011 2 Switzerland 30V 50Hz Volex http www volex com 2102H C3 10 Israel SI 32 Volex http www volex com 2115H C3 10 220V 50Hz NEA North America NEMA 5 15 ahd areas 120V 60 Hz Qualtek http www qualtekusa com 312007 01 PROTECTION FROM ELECTRIC SHOCK Operators of this instrument must be protected from electric shock at all times The owner must ensure that operators are prevented access and or are insulated from every connection poin
18. eets the intent of Directive 89 336 EEC for Electromagnetic Compatibility Compliance pertains to the following specifications as listed in the official Journal of the European Communities EN 50081 1 Emission EN 50082 1 Immunity and that this pulse generator meets the intent of the Low Voltage Directive 72 23 EEC as amended by 93 68 EEC Compliance pertains to the following specifications as listed in the official Journal of the European Communities EN 61010 1 2001 Safety requirements for electrical equipment for measurement control and laboratory use DIRECTIVE 2002 95 EC ROHS This instrument is exempt from Directive 2002 95 EC of the European Parliament and of the Council of 27 January 2003 on the Restriction of the use of certain Hazardous Substances ROHS in electrical and electronic equipment Specifically Avtech instruments are considered Monitoring and control instruments Category 9 as defined in Annex 1A of Directive 2002 96 EC The Directive 2002 95 EC only applies to Directive 2002 96 EC categories 1 7 and 10 as stated in the Article 2 Scope section of Directive 2002 95 EC DIRECTIVE 2002 96 EC WEEE European customers who have purchased this equipment directly from Avtech will have completed a WEEE Responsibility Agreement form accepting responsibility for WEEE compliance as mandated in Directive 2002 96 of the European Union and local laws on behalf of the customer as provided for under Artic
19. ernack com PE6008 50 BNC feed thru 50 Ohm terminator is suggested for this purpose When the MODE switch item 8 is set to the INT position this connector is 14 used as an output that generates 200 ns wide TTL level pulse for each trigger event This output can be used to trigger an oscilloscope or other test equipment The separation between the main output pulse and the TRIG output pulse is controlled by the DELAY controls and the ADVANCE DELAY switch For this output to operate correctly the delay setting must be less than the period OUT Connector SMA connector provides 0 to 250 Volt output to a 50 Ohm load 5 and 6 are normally connected together via the shorting bar as discussed in later sections of this manual Caution Voltages as high as 250V may be present the center conductor of this connector Avoid touching this conductor The center conductor is not user accessible when the supplied shorting bar is installed IN Connector This SMA input connects to the internal 50 Ohm load 5 and 6 are normally connected together via the shorting bar as discussed in later sections of this manual Caution Voltages as high as 250V may be present the center conductor of this connector Avoid touching this conductor The center conductor is not user accessible when the supplied shorting bar is installed PW Control one turn knob and three position range switch vary the output pulse width
20. le 9 of Directive 2002 96 EC Customers who have purchased Avtech equipment through local representatives should consult with the representative to determine who has responsibility for WEEE compliance Normally such responsibilities with lie with the representative unless other arrangements under Article 9 have been made Requirements for WEEE compliance may include registration of products with local governments reporting of recycling activities to local governments and financing of recycling activities INSTALLATION VISUAL CHECK After unpacking the instrument mainframe and the transformer module examine to ensure that they have not been damaged in shipment Visually inspect all connectors knobs and handles Confirm that a power cord and an instrumentation manual this manual are with the instrument If the instrument has been damaged file a claim immediately with the company that transported the instrument POWER RATINGS This instrument is intended to operate from 100 240 V 50 60 Hz The maximum power consumption is 57 Watts Please see the FUSES section for information about the appropriate AC and DC fuses This instrument is an Installation Category II instrument intended for operation from a normal single phase supply CONNECTION TO THE POWER SUPPLY An 320 three pronged recessed male socket is provided on the back panel AC power connection to the instrument One end of the detachabl
21. n A single pulse is generated for each button press 11 OVERLOAD Indicator When the instrument is powered this indicator is normally green indicating normal operation If this indicator is yellow an internal automatic overload protection circuit has been tripped If the unit is overloaded by operating at an exceedingly high duty cycle or by operating into a very low impedance the protective circuit will disable the output of the instrument and turn the indicator light yellow The light will stay yellow i e output disabled for about 5 seconds after which the instrument will attempt to re enable the output i e light green for about 1 second If the overload condition persists the output will be disabled again i e light yellow for another 5 seconds If the overload condition has been removed the instrument will resume normal operation This overload indicator may flash yellow briefly at start up This is not a cause for concern Overload conditions may be removed by e Reducing repetition rate e Reducing pulse width e Increasing the load impedance e Reducing the output amplitude 16 REAR PANEL CONTROLS AC POWER INPUT An IEC 320 C14 three pronged recessed male socket is provided on the back panel for AC power connection to the instrument One end of the detachable power cord that is supplied with the instrument plugs into this socket AC FUSE DRAWER The two fuses that protect the AC inpu
22. netic interference with other equipment all used outputs should be connected to shielded loads using shielded coaxial cables Unused outputs should be terminated with shielded coaxial terminators or with shielded coaxial dust caps to prevent unintentional electromagnetic radiation All cords and cables should be less than 3m in length 20 MAINTENANCE REGULAR MAINTENANCE This instrument does not require any regular maintenance On occasion one or more of the four rear panel fuses may require replacement All fuses can be accessed from the rear panel See the FUSES section for details CLEANING If desired the interior of the instrument may be cleaned using compressed air to dislodge any accumulated dust See the TOP COVER REMOVAL section for instructions on accessing the interior No other cleaning is recommended W IRING OF AC POWER STYLE 1 WIRING DIAGRAMS Do notattemptany repairs on this instrument beyond the fuse replacement procedures described in the manual ContactAv tech ifthe instrument requires servicing Service is to be performed WARNING solely by qualified service personnel 802 PCBi04D KEYPAD BOARD B UNITS ONLY C3 PUR C4 GRN POT6E ND USE TIE DOWN POINTON 158 ks LED MOUNT Di Pa95 ND LED BDL PCB 158N Mount with M2 5 0 45X12 POWER SWITCH SW 325 ND CW INDUSTRIES
23. om the rear panel Two protect the AC prime power input and two protect the internal DC power supplies The locations of the fuses on the rear panel are shown in the figure below Ejoo Fuses 1 and 2 Fuse 4 Fuse 3 AC fuses DC fuse DC fuse AC FUSE REPLACEMENT To physically access the AC fuses the power cord must be detached from the rear panel of the instrument The fuse drawer may then be extracted using small flat head screwdriver as shown below Pry out the fuse drawer using a screwdriver Fuse Drawer 12 DC FUSE REPLACEMENT The DC fuses may be replaced by inserting the tip of a flat head screwdriver into the fuse holder slot and rotating the slot counter clockwise The fuse and its carrier will then pop out FUSE RATINGS The following table lists the required fuses Nominal Recommended Replacement Part Fuses Mains Rating Case Size Littelfuse Digi Key Stock Voltage Number Number 0 5A 250V 1 2 100 240V Time Delay 0218 500HXP F2416 ND 1 6 250V 3 DC Time Delay 5520 021801 6 F2424 ND TA 250V 4 DC Time Delay 5 20 mm 0218001 F2419 ND The recommended fuse manufacturer is Littelfuse http www littelfuse com Replacement fuses may be easily obtained from Digi Key http www digikey com and other distributors 13 FRONT PANEL CONTROLS AMPLITUDE PULSE WIDTH
24. t In some cases connections must be exposed to potential human contact Operators must be trained to protect themselves from the risk of electric shock This instrument is intended for use by qualified personnel who recognize shock hazards and are familiar with safety precautions required to avoid possibly injury In particular operators should 1 Keep exposed high voltage wiring to an absolute minimum 2 Wherever possible use shielded connectors and cabling 3 Connect and disconnect loads and cables only when the instrument is turned off 4 Keep in mind that all cables connectors oscilloscope probes and loads must have an appropriate voltage rating 5 Do not attempt any repairs on the instrument beyond the fuse replacement procedures described in this manual Contact Avtech technical support see page 2 for contact information if the instrument requires servicing Service is to be performed solely by qualified service personnel ENVIRONMENTAL CONDITIONS This instrument is intended for use under the following conditions 1 indoor use 2 altitude up to 2 000 m 3 temperature 5 C to 40 C 10 maximum relative humidity 80 temperatures up to 31 C decreasing linearly to 50 relative humidity at 40 C Mains supply voltage fluctuations up to 10 of the nominal voltage no pollution or only dry non conductive pollution 11 FUSES This instrument contains four fuses All are accessible fr
25. t are located in this drawer Please see the FUSES section of this manual for more information DC FUSES These two fuses protect the internal DC power supplies Please see the FUSES sections of this manual for more information EA SWITCH AND INPUT When this switch is set to the INT position the output amplitude is controlled by the front panel amplitude dial When this switch is set to the EXT position the output amplitude is controlled by the voltage applied to the A BNC connector OV in corresponds to zero amplitude and 10V DC in corresponds to maximum amplitude 250V The input impedance of the A connector is gt 10 kQ 17 GENERAL INFORMATION TEST ARRANGEMENT The AVR 3 PW C TEK2 generates a 10 ns rise time voltage pulse 0 to 250 Volts 0 25 to 250 us which is accessible at the front panel OUT terminal A shorting bar is connected between the OUT and IN terminals and the current probe is placed over the shorting bar The IN terminal connects to ground via a 50 Ohm termination A variable current of up to 5 0 Amperes is defined by the 250 Volt pulse and the 50 Ohm termination The basic test arrangement is illustrated below AVTECH REAL TIME AVR 3 PW C P TEK2 OSCILLOSCOPE IN CONNECTOR DIRECTION OF CURRENT FLOW CHANNEL A AC OUT CONNECTOR POWER CLAMP THE USER SUPPLIED PROBE AROUND THE SHORTING BAR SYNC OUTPUT ALL CABLES 50 OHM COAXIAL For other applic
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