AVTECH ELECTROSYSTEMS AVR-7B-B Instructions Manual
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AVTECH ELECTROSYSTEMS AVR-7B-B Instructions Manual

700 volt, 10 khz pulse generator with ieee 488.2 and rs-232 control
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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
info@avtechpulse.com
Tel: 888-670-8729 (USA & Canada)
BOX 5120, LCD MERIVALE
http://www.avtechpulse.com/
or +1-613-686-6675 (Worldwide)
OTTAWA, CANADA K2C3H5
INSTRUCTIONS
MODEL AVR-7B-B
700 VOLT, 10 kHz PULSE GENERATOR
WITH IEEE 488.2 AND RS-232 CONTROL
SERIAL NUMBER:
14297

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  • Page 1 S I N C E 1 9 7 5 info@avtechpulse.com Tel: 888-670-8729 (USA & Canada) BOX 5120, LCD MERIVALE http://www.avtechpulse.com/ or +1-613-686-6675 (Worldwide) OTTAWA, CANADA K2C3H5 INSTRUCTIONS MODEL AVR-7B-B 700 VOLT, 10 kHz PULSE GENERATOR WITH IEEE 488.2 AND RS-232 CONTROL SERIAL NUMBER: 14297...

  • Page 2: Warranty

    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.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS WARRANTY........................2 TECHNICAL SUPPORT....................2 TABLE OF CONTENTS....................3 INTRODUCTION......................5 AVAILABLE OPTIONS....................6 HIGH-VOLTAGE PRECAUTIONS..................7 SPECIFICATIONS......................8 REGULATORY NOTES....................10 FCC PART 18........................10 EC DECLARATION OF CONFORMITY................10 DIRECTIVE 2011/65/EU (RoHS)...................11 DIRECTIVE 2002/96/EC (WEEE)..................11 FIRMWARE LICENSING.......................12 INSTALLATION......................13 VISUAL CHECK........................13 POWER RATINGS........................
  • Page 4 PCB 197K - HIGH VOLTAGE DISCHARGE CIRCUIT............42 PCB 183A-S AND 183A-P CAPACITOR BANKS..............43 PCB 104H - KEYPAD / DISPLAY BOARD................44 MAIN WIRING........................45 PERFORMANCE CHECK SHEET................46 Manual Reference: /fileserver2/officefiles/instructword/avr-7/AVR-7B-B,ed29.odt. Last modified November 4, 2022. Copyright © 2022 Avtech Electrosystems Ltd, All Rights Reserved.

  • Page 5: Introduction

    -XP1 option, or 1.6% with the -XP2 option). Rise and fall times are fixed at less than 20 ns (or 30 ns for units with the -R50 option). The AVR-7B-B includes an internal trigger source, but it can also be triggered or gated by an external source. A front-panel pushbutton can also be used to trigger the instrument.

  • Page 6: Available Options

    AVAILABLE OPTIONS -HN Option: The standard N-type output connector is replaced with an HN-type connector. -MHV Option: The standard N-type output connector is replaced with an MHV-type connector. -SHV Option: The standard N-type output connector is replaced with an SHV-type connector.

  • Page 7: High-Voltage Precautions

    HIGH-VOLTAGE PRECAUTIONS CAUTION: This instrument provides output voltages as high as 700 Volts under normal operating conditions, and generates up to 750V internally, so extreme caution must be employed when using this instrument. The instrument should only be used by individuals who are thoroughly skilled in high voltage laboratory techniques.

  • Page 8: Specifications

    SPECIFICATIONS Model AVR-7B-B Amplitude (V 2,13 < 25 to 700 Volts Maximum output current: 14 Amps Output resistance (in series with Standard: Nominally zero (< 2Ω) output): Optional : Nominally zero (< 2Ω), or 50Ω, switchable Rise & fall times (20%-80%) ≤...
  • Page 9 11) The output amplitude is controlled by internal high-voltage DC power supplies. This is the time required for the power supplies to rise from 5% to 95% of their full value in response to a change in settings from zero to the maximum setting. 12) Valid for 50 Ohm loads.

  • Page 10: Regulatory Notes

    This instrument does not normally require regular maintenance to minimize interference potential. However, if loose hardware or connectors are noted, they should be tightened. Contact Avtech (info@avtechpulse.com) if you require assistance. EC DECLARATION OF CONFORMITY Avtech Electrosystems Ltd. P.O. Box 5120, LCD Merivale Ottawa, Ontario Canada K2C 3H5 declare that this pulse generator meets the intent of Directive 2004/108/EG for Electromagnetic Compatibility.

  • Page 11: Directive 2011/65/Eu (Rohs)

    (also known as “RoHS Recast”). In addition, this declaration of conformity is issued under the sole responsibility of Avtech Electrosystems Ltd. Specifically, products manufactured do not contain the substances listed in the table below in concentrations greater than the listed maximum value.

  • Page 12: Firmware Licensing

    laws) on behalf of the customer, as provided for under Article 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.

  • Page 13: Installation

    INSTALLATION VISUAL CHECK After unpacking the instrument, examine to ensure that it has not been damaged in shipment. Visually inspect all connectors, knobs, liquid crystal displays (LCDs), and the handles. Confirm that a power cord, a GPIB cable, and two instrumentation manuals (this manual and the “Programming Manual for -B Instruments”) are with the instrument.

  • Page 14: Protection From Electric Shock

    Destination Region Description Option Manufacturer Part Number United Kingdom, Hong Kong, BS 1363, -AC00 Qualtek 370001-E01 Singapore, Malaysia 230V, 50 Hz AS 3112:2000, Australia, New Zealand -AC01 Qualtek 374003-A01 230-240V, 50 Hz Continental Europe, Korea, European CEE 7/7 -AC02 Qualtek 364002-D01 Indonesia, Russia “Schuko”...

  • Page 15: Environmental Conditions

    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; 4. maximum relative humidity 80 % for temperatures up to 31 °C decreasing linearly to 50 % relative humidity at 40 °C;...

  • Page 16: Fuses

    FUSES This instrument contains four fuses. All are accessible from 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: Fuses #1 and #2 Fuse #4 Fuse #3...

  • Page 17: Dc Fuse Replacement

    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 for standard models: Recommended Replacement Part Nominal Fuses...

  • Page 18: Front Panel Controls

    FRONT PANEL CONTROLS 1. POWER Switch . This is the main power switch. When turning the instrument on, there is normally a delay of 10 seconds before anything is shown on the main display, as the internal operating system boots up. 2.
  • Page 19 which lists the key adjustable parameters and their current values. The “Programming Manual for -B Instruments” describes the menus and submenus in detail. 6. KEYPAD . Control Name Function MOVE This moves the arrow pointer on the display. CHANGE This is used to enter the submenu, or to select the operating mode, pointed to by the arrow pointer.

  • Page 20: Rear Panel Controls

    REAR PANEL CONTROLS GATE TRIG RS-232 GPIB Note: some connectors may be in different positions than shown above, depending on the exact combination of options ordered. 1. 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.
  • Page 21 6. GPIB Connector . A standard GPIB cable can be attached to this connector to allow the instrument to be computer-controlled. See the “Programming Manual for -B Instruments” for more details on GPIB control. 7. RS-232 Connector. A standard serial cable with a 25-pin male connector can be attached to this connector to allow the instrument to be computer-controlled.

  • Page 22: General Information

    GENERAL INFORMATION BASIC PULSE CONTROL This instrument can be triggered by its own internal clock or by an external TTL trigger signal. In either case, two output channels respond to the trigger: OUT and SYNC. The OUT channel is the signal that is applied to the load. Its amplitude and pulse width are variable.
  • Page 23 > 50 ns TRIG TTL LEVELS (external input) (0V and 3V-5V) PROPAGATION DELAY (FIXED) 100 ns, FIXED SYNC OUT 3V, FIXED DELAY > 0 PULSE WIDTH AMPLITUDE, VARIABLE MAIN OUTPUT Figure C As before, if the delay is negative, the order of the SYNC and OUT pulses is reversed. The last figure illustrates the relationship between the signal when an external TTL-level trigger is used in the PW mode.

  • Page 24: Trigger Modes

    TRIGGER MODES This instrument has four trigger modes:  Internal Trigger: the instrument controls the trigger frequency, and generates the clock internally.  External Trigger: the instrument is triggered by an external TTL-level clock on the back-panel TRIG connector.  Manual Trigger: the instrument is triggered by the front-panel “SINGLE PULSE” pushbutton.

  • Page 25: Preventing Output Stage Failure

    PREVENTING OUTPUT STAGE FAILURE The output stage is protected against overload conditions by an overload circuit and fuses on the main frame back panel. However, the output switching elements may fail if the unit is triggered at a PRF exceeding 10 kHz or at duty cycles resulting in an average output power in excess of 50 Watts.

  • Page 26: Output And Load Impedance (Standard Units)

    350 Volts, from 700 Volts. LOAD IMPEDANCE The AVR-7B-B can provide voltage of up to 700V, and currents of up to 14A. When operated at maximum amplitude, the load impedance must therefore be 700V / 14A = 50Ω, or higher.

  • Page 27: Output And Load Impedance (-R50 Units)

    OUTPUT AND LOAD IMPEDANCE (-R50 UNITS) -R50 OPTION The output impedance (the internal resistance in series with the output) on standard models (without the -R50 option) is low, to allow the pulsers to act as true voltage sources (R ≈ 0Ω), and to maximize the voltage output into 50Ω loads. However, for some applications it may be desirable to have R =50Ω.

  • Page 28: Driving A Diode Load Directly

    = 0Ω = 50Ω = 220Ω LOAD = ∞ LOAD It should be observed that maximum voltages are obtained when R = 0Ω, but transmission line reflections are minimized with R = 50Ω. Also, regardless of the value of R , reflections and ringing are minimized when R = 50Ω.
  • Page 29 Top: +700V pulse, internally (before ROUT) Bottom: resulting +14A current, measured with a CT2 current probe (1V/A).

  • Page 30: Operational Check

    OPERATIONAL CHECK This section describes a sequence to confirm the basic operation of the instrument. It should be performed after receiving the instrument. It is a useful learning exercise as well. Before proceeding with this procedure, finish read this instruction manual thoroughly. Then read the “Local Control”...
  • Page 31 3. Turn on the AVR-7B-B. The main menu will appear on the LCD. 4. To set the AVR-7B-B to trigger from the internal clock at a PRF of 1 kHz:  The arrow pointer should be pointing at the frequency menu item. If it is not, press the MOVE button until it is.
  • Page 32  Press the MOVE button until the arrow pointer is pointing at the output menu item.  Press the CHANGE button. The output submenu will appear.  Press MOVE until the arrow pointer is pointing at the “ON” choice.  Press CHANGE to return to the main menu. 9.

  • Page 33: Programming Your Pulse Generator

    PROGRAMMING YOUR PULSE GENERATOR KEY PROGRAMMING COMMANDS The “Programming Manual for -B Instruments” describes in detail how to connect the pulse generator to your computer, and the programming commands themselves. A large number of commands are available; however, normally you will only need a few of these.

  • Page 34: All Programming Commands

    ALL PROGRAMMING COMMANDS For more advanced programmers, a complete list of the available commands is given below. These commands are described in detail in the “Programming Manual for -B Instruments”. (Note: this manual also includes some commands that are not implemented in this instrument.
  • Page 35 TRIGger: :SOURce INTernal | EXTernal | MANual | HOLD | IMMediate *CLS [no query form] *ESE <numeric value> *ESR? [query only] *IDN? [query only] *OPC *SAV 0 | 1 | 2 | 3 [no query form] *RCL 0 | 1 | 2 | 3 [no query form] *RST [no query form]...

  • Page 36: Mechanical Information

    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 the power cord and allow the instrument to sit unpowered for 10 minutes before opening the instrument.

  • Page 37: Maintenance

    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.

  • Page 38: Wiring Diagrams

    WIRING DIAGRAMS WIRING OF AC POWER (STANDARD UNITS)

  • Page 39: Wiring Of Dc Power

    WIRING OF DC POWER...

  • Page 40: Pcb 158R7 - Low Voltage Power Supply

    PCB 158R7 - LOW VOLTAGE POWER SUPPLY...

  • Page 41: Pcb 156D - Polarity Control Pcb (-Pn Units)

    PCB 156D - POLARITY CONTROL PCB (-PN UNITS) R2 8 R2 3 "UV- ON" IS HIGH IF: 1) "UV+ HIGH" IS LOW, AND +1 5 V VC C VC C 2) "POL" IS LOW. R1 9 R1 2 0 . 1 u F R1 6 5 6 K SU RF AC E MOUN T , ON B OTTOM.

  • Page 42: Pcb 197K - High Voltage Discharge Circuit

    PCB 197K - HIGH VOLTAGE DISCHARGE CIRCUIT...

  • Page 43: Pcb 183A-S And 183A-P Capacitor Banks

    PCB 183A-S AND 183A-P CAPACITOR BANKS 183A-S (SERIES CAPACITOR BANK) 7 2 00 K -ND, Mfg . 7 2 0 0, 4 -4 0 th read stan do ff 3 /8" HV + GN D 7 2 00 K -ND, Mfg . 7 2 0 0, 4 -4 0 th read stan do ff 3 /8" X1 1 7 2 00 K -ND, Mfg .

  • Page 44: Pcb 104H - Keypad / Display Board

    PCB 104H - KEYPAD / DISPLAY BOARD...

  • Page 45: Main Wiring

    MAIN WIRING...

  • Page 46: Performance Check Sheet

    PERFORMANCE CHECK SHEET...

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14297

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