A V T E C H E L E C T R O S Y S T E M S L T D . N A N O S E C O N D W A V E F O R M E L E C T R O N I C S S I N C E 1 9 7 5 P.O. BOX 265 TEL: 1-800-265-6681 X BOX 5120, LCD MERIVALE OGDENSBURG, NY FAX: 1-800-561-1970 OTTAWA, ONTARIO U.S.A. 13669-0265 CANADA K2C 3H4 TEL: (315) 472-5270 e-mail: info@avtechpulse.com TEL: (613) 226-5772 FAX: (613) 226-2802 http://www.avtechpulse.com/ FAX: (613) 226-2802 INSTRUCTIONS MODEL AVMR-2-C 0 TO 20 VOLTS, 10 MHz HIGH SPEED PULSE GENERATOR WITH 3 ns RISE & FALL TIMES SERIAL NUMBER: ____________ __________________________________________________________________ 2 WARRANTY Avtech Electrosystems Ltd. warrants products of its manuf acture 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, Avtec h shall at its option repair or replace said defective item. This warranty does no t apply to units which have been dissembled, modified or subjected to conditions exceeding the applicable specifications or ratings. This warranty is th e extent of the obligation assumed by Avtech with respect to this product and n o other warranty or guarantee is either expressed or implied. TECHNICAL SUPPORT Phone: 613-226-5772 or 1-800-265-6681 Fax: 613-226-2802 or 1-800-561-1970 E-mail: info@avtechpulse.com World Wide Web: http://www.avtechpulse.com __________________________________________________________________ 3 TABLE OF CONTENTS WARRANTY............................................................... ..................................................... 2 TECHNICAL SUPPORT...................................................... ............................................ 2 TABLE OF CONTENTS...................................................... ............................................ 3 INTRODUCTION........................................................... .................................................. 5 AVAILABLE OPTIONS...................................................... ..................................................... 5 SPECIFICATIONS......................................................... .................................................. 6 EC DECLARATION OF CONFORMITY........................................... ...............................7 INSTALLATION........................................................... .................................................... 8 VISUAL CHECK........................................................... ........................................................... 8 POWER RATINGS.......................................................... ........................................................ 8 CONNECTION TO THE POWER SUPPLY......................................... .................................... 8 ENVIRONMENTAL CONDITIONS............................................... ........................................... 8 FUSES.................................................................. ........................................................... 9 AC FUSE REPLACEMENT.................................................... ................................................. 9 DC FUSE REPLACEMENT.................................................... ............................................... 10 FUSE RATINGS........................................................... ......................................................... 10 FRONT PANEL CONTROLS................................................... ..................................... 11 REAR PANEL CONTROLS.................................................... ...................................... 13 GENERAL INFORMATION.................................................... ....................................... 15 BASIC TEST ARRANGEMENT................................................. ............................................ 15 BASIC PULSE CONTROL.................................................... ................................................ 16 MINIMIZING WAVEFORM DISTORTIONS........................................ ...........................17 USE 50 OHM TRANSMISSION LINES AND LOADS................................ ...........................17 USE LOW-INDUCTANCE LOADS............................................... ......................................... 17 PREVENTING DAMAGE...................................................... ......................................... 17 MECHANICAL INFORMATION................................................. ....................................18 TOP COVER REMOVAL...................................................... ................................................. 18 ELECTROMAGNETIC INTERFERENCE........................................... ................................... 18 MAINTENANCE............................................................ ................................................ 18 REGULAR MAINTENANCE.................................................... .............................................. 18 CLEANING............................................................... ............................................................. 18 PERFORMANCE CHECK SHEET................................................ ................................ 19 __________________________________________________________________ 4 Manual Reference: /fileserver1/officefiles/instructword/avmr/avmr-2-c,e dition1.sxw. Last modified February 29, 2024. Copyright © 2024 Avtech Electrosystems Ltd, All Rights Reserved. __________________________________________________________________ 5 INTRODUCTION The AVMR-2-C is a high performance instrument capable of generating up to 20V into 50Ω loads at repetition rates up to 10 MHz. The output pulse width is v ariable from 20 to 200 ns, and the sync delay is variable up to 200 ns. The rise fall t imes are less than 3 ns. The maximum duty cycle is 20%. Instruments with the "-P" model suffix can generate 0 to +20V, whereas instruments with the "-N" model suffix can generate 0 to -20V. Instruments with the "-PN" suffix can generate both polarities. The output is designed to drive 50Ω loads. (A 50Ω load is required for proper operation.) The output is AC-coupled. This instrument is intended for use in research and development laborat ories. AVAILABLE OPTIONS This instrument is available with several options: "-OT" Option: this option adds an internally-generated 0 to ±5V DC offs et to the main output. "-EO" Option: the DC offset can be controlled by an externally generate d 0 to +10V analog control voltage. "-EA" Option: the amplitude can be controlled by an externally generate d 0 to +10V analog control voltage. "-EW" Option: the pulse width can be controlled by an externally genera ted 0 to +10V analog control voltage. "-M" Option: a monitor output is provided. __________________________________________________________________ 6 SPECIFICATIONS Model: AVMR-2-C1 Amplitude3,4: (50 Ohm load) Variable to 20 Volts Pulse width3: 20 to 200 ns PRF: 0 to 10 MHz Duty cycle: 20% Rise and fall times: 3 ns fixed (standard), or (20%-80%) 300ps/3ns switchable (-TRF option5) Polarity6: Positive or negative or both (specify) Propagation delay: < 150 ns. Ext trig in to pulse out. Jitter: ± 15 ps DC offset or bias insertion3,7: Apply required DC offset to back panel solder terminals (± 50 V, 250 mA max) Trigger required: ext trig mode: + 5 Volts, 10 ns or wider (TTL) Sync delay and output: Sync out to pulse out delay: variable 0 to 200 ns. Sync output: +2V, 200 ns, will drive 50 Ohms. Monitor output option8: Provides a 20 dB attenuated coincident replica of main output Connectors: Out, Monitor: SMA. Trig: BNC Power requirements: 100 - 240 Volts, 50-60 Hz Dimensions: (H x W x D) 100 mm x 215 mm x 375 mm (3.9” x 8.5” x 14.8”) Chassis material: cast aluminum frame & handles, blue vinyl on aluminum cover plates Temperature range: +5°C to +40°C 1) -C suffix indicates stand-alone lab instrument with internal clock and line powering. No suffix indicates miniature module requiring DC power and external trigger. (See page 112 for additional details of the basic ins trument formats). 2) -B suffix indicates IEEE-488.2 GPIB and RS-232 control of amplitude, pu lse width, PRF and delay (See page 8). 3) For electronic control (0 to +10V) of amplitude, pulse width, or DC off set, suffix model number with -EA or -EW or -EO. Electronic control un its also include standard front-panel controls. 4) For operation at amplitudes of less than 10% of full-scale, best result s will be obtained 5) by setting the amplitude near full-scale and using external attenuators on the output. 6) For switchable rise/fall time option suffix the model number with -TRF. Available only on -C units and modules. 7) Indicate desired polarity by suffixing model number with -P or -N (i.e. positive or negative) or -P-PN or -N-PN for dual polarity option wher e the suffix preceding -PN indicates the polarity at the mainframe output. ( -PN available only for -B & -C units). 8) For internally generated DC offset option (0 to ± 5V, one-turn control) add the suffix -OT to model number. -OT and -EO options not available on modules. 9) For monitor option add suffix -M (not available on modules). __________________________________________________________________ 7 EC DECLARATION OF CONFORMITY We Avtech Electrosystems Ltd. P.O. Box 5120, LCD Merivale Ottawa, Ontario Canada K2C 3H4 declare that this pulse generator meets the intent of Directive 89/336/ EEC for Electromagnetic Compatibility. Compliance pertains to the following spe cifications 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 Direc tive 72/23/EEC as amended by 93/68/EEC. Compliance pertains to the following specifica tions 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 __________________________________________________________________ 8 INSTALLATION VISUAL CHECK After unpacking the instrument mainframe and the transfor mer module, examine to ensure that they have not been damaged in shipment. Visually inspect al l connectors, knobs, and handles. Confirm that a power cord and an instrumentation ma nual (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” secti on for information about the appropriate AC and DC fuses. This instrument is an “Installation Category II” instrument, intended f or operation from a normal single-phase supply. CONNECTION TO THE POWER SUPPLY An IEC-320 three-pronged recessed male socket is provided on the back p anel for AC power connection to the instrument. One end of the de tachable power cord that is supplied with the instrument plugs into this socket. The other end of t he 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 cable used to connect the instrument to the mains supply must provide an earth connection. (The s upplied cable does this.) ENVIRONMENTAL CONDITIONS This instrument is intended for use under the following conditions: a) indoor use; b) altitude up to 2 000 m; c) temperature 5 °C to 40 °C; d) maximum relative humidity 80 % for temperatures up to 31 °C decreasing linearly to 50 % relative humidity at 40 °C; e) Mains supply voltage fluctuations up to ±10 % of the nominal voltage ; f) no pollution or only dry, non-conductive pollution. __________________________________________________________________ 9 FUSES This instrument contains four fuses. All are accessible from the rear-p anel. Two protect the AC prime power input, and two protect the interna l DC power supplies. The locations of the fuses on the rear panel are shown in the figure below: 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 a small flat-head screwdriver, as shown below: Pry out the fuse drawer using a screwdriver. Fuse Drawer __________________________________________________________________ 10 DC FUSE REPLACEMENT The DC fuses may be replaced by inserting the tip of a flat-head screwd river 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 Manufacturer’s Distributor’s Case Fuses Mains Rating Part Number Part Number Size Voltage (Wickmann) (Digi-Key) 0.5A, 250V, #1, #2 (AC) 100-240V 5×20 mm 1950500000 WK5041-ND Time-Delay 0.8A, 250V, #3 (DC) N/A 5×20 mm 1950800000 WK5046-ND Time-Delay 0.5A, 250V, #4 (DC) N/A 5×20 mm 1950500000 WK5041-ND Time-Delay The fuse manufacturer is Wickmann (http://www.wickmann.com/). Replacement fuses may be easily obtained from Digi-Key (http://www.digi key.com/) and other distributors. __________________________________________________________________ 11 FRONT PANEL CONTROLS 3 5 6 1 2 4 7 8 1) P OWER Switch . This is the main power switch. When turning the instrum ent on, there may be a delay of several seconds before the instrument appears t o respond. 2) O VERLOAD Indicator . When the instrument is powered, this indicator is normally green, indicating normal operation. If this indicator is yellow, an int ernal 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 instr ument and turn the indicator light yellow. The light will stay yellow (i.e. outpu t disabled) for about 5 seconds after which the instrument will attempt to re-enable th e output (i.e. light green) for about 1 second. If the overload condition persis ts, the output will be disabled again (i.e. light yellow) for another 5 seconds. If th e overload condition has been removed, the instrument will resume normal operation . This overload indicator may flash yellow briefly at start-up. This is n ot a cause for concern. 3) P RF Range Switch . This switch sets the pulse repetition frequency (PR F) range of the internal oscillator. The marked value of each position is the up per limit of the 10:1 range, approximately. The vernier dial directly below the swit ch varies the PRF within the set range. __________________________________________________________________ 12 If this switched is set to the “EXT” position, the instrument is trigge red by a signal applied to the TRIG connector, rather than by the internal oscillator. 4) T RIG Connector . When the PRF Range Switch is set to one of the four i nternal oscillator ranges, this connector is an output, which supplies a 2V, 20 0 ns wide pulse for each trigger event. This output may be used to trigger oscill oscopes or other equipment. When the PRF Range Switch is set to “EXT”, the instrument is triggered by a TTL pulse applied to this connector. The pulse must be at least 50 ns w ide. The input impedance of this input is 1 kΩ. 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.pasternack.co m) PE6008-50 BNC feed-thru 50 Ohm terminator is suggested for this purpose . For systems using SMA connectors, the PE6026 SMA feed-thru 50 Ohm terminato r is suggested. 5) D elay Controls . When the PRF Range Switch is set to one of the four i nternal oscillator ranges, the main output is advanced or delayed relative to t he TRIG output pulse (item 3). The delay is variable up to 500 ns, approximatel y, using the DELAY and DELAY FINE dials. 6) P ulse Width Control . This dial controls the pulse width. 7) A mplitude Control . This dial controls the pulse amplitude. 8) O UT Connector . This connector provides the main output signal, into l oad impedances of 50Ω. (This output requires a 50Ω load to function properl y). __________________________________________________________________ 13 REAR PANEL CONTROLS 1 3 4 M INT EXT A 5 PW OFFSET 6 AMP ON OFF OS 7 OS GND OFFSET OUT U 8 9 2 1. A C POWER INPUT . An IEC-320 C14 three-pronged recessed male socket is provided on the back panel for AC power connection to the instrument. O ne end of the detachable power cord that is supplied with the instrument plugs in to this socket. 2. A C FUSE DRAWER . The two fuses that protect the AC input are located i n this drawer. Please see the “FUSES” section of this manual for more informat ion. 3. D C FUSES . These two fuses protect the internal DC power supplies. Ple ase see the “FUSES” sections of this manual for more information. 4. M ONITOR Output (Optional, -M units only) . Provides an attenuated (÷1 0) coincident replica (to 50 Ohms) of the main output. 5. P W INT/EXT SWITCH AND CONNECTOR (Optional, -EW units only) . To contro l the pulse width of the output with an external DC voltage, set the two-posi tion switch to the EXT position and apply 0 to +10V to the BNC Connector (RIN ≥ 10 kΩ) . When this switch is in the “INT” position, the pulse width is controlled by the front-panel controls. 6. A MP INT/EXT SWITCH AND CONNECTOR (Optional, -EA units only) . To contr ol the amplitude of the output with an external DC voltage, set the two-po sition switch to the EXT position and apply 0 to +10V to the BNC Connector (RIN ≥ 10 kΩ). When this switch is in the “INT” position, the amplitude is controlled by th e front-panel controls. 7. O S INT/EXT SWITCH AND CONNECTOR (Optional, -EO units only) . To contro l the offset of the output with an external DC voltage, set the two-position switch to the EXT position and apply 0 to +10V to the BNC Connector (RIN ≥ 10 kΩ). Wh en this switch is in the “INT” position, the offset is controlled by the front- panel controls. __________________________________________________________________ 14 8. O S INPUT (For units without -OT or -EO options) . To add a DC offset t he output pulse, connect a DC power supply set to the desired offset value to the se terminals. The maximum allowable DC offset voltage is ±50 Volts, and the maximum D C current is 250 mA. When not used, this input should be connected to the adjacent ground terminal. 9. O FFSET ON/OFF SWITCH & OUTPUT (Optional, -EO and -OT units only) . Thi s switch enables the offset feature when it is set to “ON”. When it is se t to “OFF”, no offset is added to the output. The internally generated offset is avail able at the “OFFSET OUT” BNC connector, for monitoring purposes. __________________________________________________________________ 15 GENERAL INFORMATION BASIC TEST ARRANGEMENT The AVMR-2-C should be tested with an oscilloscope with a bandwidth of at least 300 MHz to properly observe the high-speed waveform. A typical test arrange ment is shown below using a real-time oscilloscope: AVTECH REAL-TIME PULSER OSCILLOSCOPE SCOPE PROBE MAIN OUTPUT CHANNEL A CONNECTOR TEST AC LOAD POWER SYNC TRIG OUTPUT INPUT ALL CABLES: 50 OHM COAXIAL A high-speed sampling oscilloscope can also be used: AVTECH SAMPLING PULSER OSCILLOSCOPE MAIN OUTPUT 50 OHM INPUT CONNECTOR 40 dB AC ATTENUATOR POWER TRIG TRIG CONNECTOR CONNECTOR ALL CABLES: 50 OHM COAXIAL If a sampling oscilloscope is used, attenuators are required to prevent damage to the sampling oscilloscope. A 40 dB attenuator with sufficient voltage ratin g should be used on the main output. Factory tests are conducted using several Midwest M icrowave 10 dB and 20 dB attenuators (models ATT-0444-10-SMA-02 and ATT-0444-20-SMA -02, respectively) connected in series. __________________________________________________________________ 16 BASIC PULSE CONTROL This instrument can be triggered by its own internal clock or by an ext ernal TTL trigger signal. When triggered internally, two mainframe output channels respon d to the trigger: OUT and SYNC.  OUT. This is the main output. The maximum output voltage is 20V.  TRIG. The TRIG pulse is a fixed-width TTL-level reference pulse used to trigger oscilloscopes or other measurement systems. The TRIG output precedes the main output. These pulses are illustrated below: 200 ns, FIXED TRIG (generated by the 2V, FIXED internal oscillator) DELAY PULSE WIDTH AMPLITUDE, VARIABLE MAIN OUTPUT When triggered externally, the TRIG connector acts as an input. The del ay controls do not function in this mode. This illustrated below: > 50 ns TRIG TTL LEVELS (external input) (0V and 3V-5V) PROPAGATION DELAY (FIXED) PULSE WIDTH MAIN OUTPUT AMPLITUDE, VARIABLE __________________________________________________________________ 17 MINIMIZING WAVEFORM DISTORTIONS USE 50 OHM TRANSMISSION LINES AND LOADS Connect the load to the pulse generator with 50Ω transmission lines (e. g. RG-58 or RG- 174 cable). This instrument requires a 50Ω load for proper operation. It will not p roperly drive a high-impedance load. The output stage will be damaged if it is operated into an open circuit (or any other high impedance). Failures due to improper output loading are not covered by the warranty. USE LOW-INDUCTANCE LOADS Lenz’s Law predicts that for an inductive voltage spike will be generat ed when the current through an inductance changes. Specifically, VSPIKE = L × dILOA D/dt, where L is the inductance, ILOAD is the load current change, and t is time. For th is reason, it is important to keep any parasitic in the load low. This means keeping wir ing short, and using low inductance components. In particular, wire-wound resistors sh ould be avoided. PREVENTING DAMAGE The AVMR-2-C may fail if triggered at a PRF greater than 10 Mhz, or if the duty cycle exceeds 20%. This unit is designed to operate into a load impedance of 50 Ohms and t he output stage will be damaged if it is operated into an open circuit (or any other hi gh impedance). Failures due to improper output loading are not covered by the warranty . The lifetime of the switching elements in the pulse generator module is proportional to the running time of the instrument. For this reason the prime power to the instrument should be turned off when the instrument is not in use. __________________________________________________________________ 18 MECHANICAL INFORMATION TOP COVER REMOVAL If necessary, the interior of the instrument may be accessed by removin g the four Phillips screws on the top panel. With the four screws removed, the top cover may be slid back (and off). Always disconnect the power cord before opening the instrument. There are no user-adjustable internal circuits. For repairs other than fuse replacement, please contact Avtech (info@avtechpulse.com) to arrange for the instrum ent to be returned to the factory for repair. Caution: High voltages are present inside the instrument during normal operation. Do not operate the instrument with the cover removed. ELECTROMAGNETIC INTERFERENCE To prevent electromagnetic interference with other equipment, all used outputs should be connected to shielded 50Ω loads using shielded 50Ω coaxial cables. U nused outputs should be terminated with shielded 50Ω coaxial terminators or w ith shielded coaxial dust caps, to prevent unintentional electromagnetic radiation. All cords and cables should be less than 3m in length. MAINTENANCE REGULAR MAINTENANCE This instrument does not require any regular maintenance. On occasion, one or more of the four rear-panel fuses may require repla cement. 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 compres sed air to dislodge any accumulated dust. (See the “TOP COVER REMOVAL” section for instructions on accessing the interior.) No other cleaning is recommend ed. __________________________________________________________________ 19 PERFORMANCE CHECK SHEET __________________________________________________________________ Document Outline * [1]WARRANTY * [2]TECHNICAL SUPPORT * [3]TABLE OF CONTENTS * [4]INTRODUCTION + [5]AVAILABLE OPTIONS * [6]SPECIFICATIONS * [7]EC DECLARATION OF CONFORMITY * [8]INSTALLATION + [9]VISUAL CHECK + [10]POWER RATINGS + [11]CONNECTION TO THE POWER SUPPLY + [12]ENVIRONMENTAL CONDITIONS * [13]FUSES + [14]AC FUSE REPLACEMENT + [15]DC FUSE REPLACEMENT + [16]FUSE RATINGS * [17]FRONT PANEL CONTROLS * [18]REAR PANEL CONTROLS * [19]GENERAL INFORMATION + [20]BASIC TEST ARRANGEMENT + [21]BASIC PULSE CONTROL * [22]MINIMIZING WAVEFORM DISTORTIONS + [23]USE 50 OHM TRANSMISSION LINES AND LOADS + [24]USE LOW-INDUCTANCE LOADS * [25]PREVENTING DAMAGE * [26]MECHANICAL INFORMATION + [27]TOP COVER REMOVAL + [28]ELECTROMAGNETIC INTERFERENCE * [29]MAINTENANCE + [30]REGULAR MAINTENANCE + [31]CLEANING * [32]PERFORMANCE CHECK SHEET __________________________________________________________________ References 1. file:///root/tmp.html#2 2. file:///root/tmp.html#2 3. file:///root/tmp.html#3 4. file:///root/tmp.html#5 5. file:///root/tmp.html#5 6. file:///root/tmp.html#6 7. file:///root/tmp.html#7 8. file:///root/tmp.html#8 9. file:///root/tmp.html#8 10. file:///root/tmp.html#8 11. file:///root/tmp.html#8 12. file:///root/tmp.html#8 13. file:///root/tmp.html#9 14. file:///root/tmp.html#9 15. file:///root/tmp.html#10 16. file:///root/tmp.html#10 17. file:///root/tmp.html#11 18. file:///root/tmp.html#13 19. file:///root/tmp.html#15 20. file:///root/tmp.html#15 21. file:///root/tmp.html#16 22. file:///root/tmp.html#17 23. file:///root/tmp.html#17 24. file:///root/tmp.html#17 25. file:///root/tmp.html#17 26. file:///root/tmp.html#18 27. file:///root/tmp.html#18 28. file:///root/tmp.html#18 29. file:///root/tmp.html#18 30. file:///root/tmp.html#18 31. file:///root/tmp.html#18 32. file:///root/tmp.html#19