Avtech AVMH-1 User manual

INSTRUCTIONS
MODEL AVMH-1-C
10 VOLTS, 20 MHz
IMPULSE GENERATOR
WITH 0.2 – 1 ns PULSE WIDTH
SERIAL NUMBER: 1 312
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
[e-mail]
http://www.avtechpulse.com/
Tel: [phone] (USA & Canada)
or [phone] (Worldwide)
BOX 5120, LCD MERIVALE
OTTAWA, CANADA K2C3H5

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 is either expressed or implied.
TECHNICAL SUPPORT
Phone: [phone] (USA & Canada)
or [phone] (Worldwide)
E-mail: [e-mail]
World Wide Web: http://www.avtechpulse.com
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TABLE OF CONTENTS
WARRANTY....................................................................................................................2
TECHNICAL SUPPORT..................................................................................................2
TABLE OF CONTENTS.................................................................................................. 3
INTRODUCTION............................................................................................................. 5
AVAILABLE OPTIONS...........................................................................................................5
SPECIFICATIONS...........................................................................................................6
REGULATORY NOTES.................................................................................................. 7
FCC PART 18.......................................................................................................................... 7
EC DECLARATION OF CONFORMITY..................................................................................7
DIRECTIVE 2011/65/EU (RoHS .............................................................................................8
DIRECTIVE 2002/96/EC (WEEE ............................................................................................8
INSTALLATION.............................................................................................................10
VISUAL CHECK.................................................................................................................... 10
POWER RATINGS................................................................................................................10
CONNECTION TO THE POWER SUPPLY...........................................................................10
PROTECTION FROM ELECTRIC SHOCK...........................................................................11
ENVIRONMENTAL CONDITIONS........................................................................................12
FUSES........................................................................................................................... 13
AC FUSE REPLACEMENT...................................................................................................13
DC FUSE REPLACEMENT...................................................................................................14
FUSE RATINGS.................................................................................................................... 14
FRONT PANEL CONTROLS........................................................................................ 15
REAR PANEL CONTROLS..........................................................................................17
GENERAL INFORMATION...........................................................................................18
BASIC TEST ARRANGEMENT.............................................................................................18
BASIC PULSE CONTROL....................................................................................................18
SHAPING THE IMPULSE......................................................................................................19
POLARITY INVERSION........................................................................................................19
MINIMIZING WA EFORM DISTORTIONS...................................................................20
USE 50Ω TRANSMISSION LINES AND LOADS..................................................................20
USE LOW-INDUCTANCE LOADS........................................................................................20
PRE ENTING DAMAGE............................................................................................... 20
OPTIONS.......................................................................................................................21
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-OS OPTION.......................................................................................................................... 21
-M OPTION............................................................................................................................ 21
MECHANICAL INFORMATION.....................................................................................22
TOP COVER REMOVAL.......................................................................................................22
ELECTROMAGNETIC INTERFERENCE..............................................................................22
MAINTENANCE............................................................................................................ 23
REGULAR MAINTENANCE..................................................................................................23
CLEANING............................................................................................................................23
WIRING DIAGRAMS.....................................................................................................24
WIRING OF AC POWER.......................................................................................................24
PCB 158R5 - LOW VOLTAGE POWER SUPPLY................................................................25
PCB 219E - OSCILLATOR AND TRIGGER..........................................................................26
MAIN WIRING....................................................................................................................... 27
PERFORMANCE CHECK SHEET................................................................................28
Manual Reference: /fileserver2/officefiles/instructword/avmh/AVMH-1-C,ed10.odt.
Last modified December 1 , 2022.
Copyright © 2022 Avtech Electrosystems Ltd, All Rights Reserved.

INTRODUCTION
The AVMH-1-C is a high performance instrument capable of generating up to 10V into
50Ω loads at repetition rates up to 20 MHz. The output pulse width may be adjusted
from < 0.2 ns to > 1 ns.
Instruments with the "-P" model suffix can generate up to +10V, whereas instruments
with the "-N" model suffix can generate up to -10V.
Instruments with the "-P-PN" suffix generate up to +10V at the main output, and are
supplied with an inverting transformer that can be installed on the output to generate a
negative signal.
Instruments with the "-N-PN" suffix generate up to -10V at the main output, and are
supplied with an inverting transformer that can be installed on the output to generate a
positive signal.
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 laboratories.
AVAILABLE OPTIONS
The AVMH-1-C is available with several options:
-M Option: a monitor output is provided.
-OS Option: an externally generated DC offset can be added to the output.
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SPECIFICATIONS
Model1: AVMH-1-C
Max.5 amplitude (50Ω load ): 10 V
Pulse width: 0.2 - 1 ns
Pulse width measured at: 50% (FWHM)
PRF, internal trigger:
external trigger:
1 kHz - 20 MHz
0 - 20 MHz
Polarity2: Positive or negative or both (specify)
Propagation delay: ≤ 50 ns (Ext trig in to pulse out)
Jitter: ± 15 ps (Ext trig in to pulse out)
DC offset: Optional3: Apply the required externally-generated DC offset to
back-panel solder terminals (±50 Volts, ±250 mA max)
Trigger required:
(ext trig mode) TTL-level (Low: 0V, High: +3V to +5V), ≥ 10 ns, RIN = 50Ω6.
Sync output: +3 Volts, width varies with PRF (always > 10 ns), drives ≥ 50Ω
Sync delay: Variable 0 to 80 ns, Sync out to pulse out
Monitor output: Optional7. Provides a ÷11 (-21 dB) attenuated
coincident replica of the main output, into 50 Ohms.
Accuracy / calibration: Not calibrated. Controls may interact. For high-accuracy applications requiring
traceable calibration, verify the output with a calibrated oscilloscope.
Connectors: Out, Monitor: SMA, Trig: BNC
Power requirement: 100 - 2 0 Volts, 50 - 60 Hz
Dimensions (H×W×D): 100 x 30 x 375 mm (3.9” x 17” x 1 .8”)
Chassis material: Anodized aluminum, with gray plastic trim.
Temperature range: +5°C to + 0°C
1) -C suffix indicates stand-alone lab instrument with internal clock and line powering. (See http://www.avtechpulse.com/formats for additional details of the basic instrument
formats).
2) 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 where the suffix preceding -PN
indicates the polarity at the mainframe output port.
3) For DC offset option add suffix -OS.
) A 50 Ohm load is required. Other loads may damage the instrument. Consult Avtech ([e-mail]) if you need to drive other load impedances.
5) For operation at amplitudes of less than 20% of full-scale, best results will be obtained by setting the amplitude near full-scale and using external attenuators on the
output.
6) An input impedance of ≥1 kΩ can also be provided (-Z1K option).
7) For monitor option add the suffix -M to the model number.
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REGULATORY NOTES
FCC PART 18
This device complies with part 18 of the FCC rules for non-consumer industrial,
scientific and medical (ISM) equipment.
This instrument is enclosed in a rugged metal chassis and uses a filtered power entry
module (where applicable). The main output signal is provided on a shielded connector
that is intended to be used with shielded coaxial cabling and a shielded load. Under
these conditions, the interference potential of this instrument is low.
If interference is observed, check that appropriate well-shielded cabling is used on the
output connectors. Contact Avtech ([e-mail]) for advice if you are unsure
of the most appropriate cabling. Also, check that your load is adequately shielded. It
may be necessary to enclose the load in a metal enclosure.
If any of the connectors on the instrument are unused, they should be covered with
shielded metal “dust caps” to reduce the interference potential.
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 ([e-mail]) if you require assistance.
EC DECLARATION OF CONFORMITY
We Avtech Electrosystems Ltd.
P.O. Box 5120, LCD Merivale
Ottawa, Ontario
Canada K2C 3H5
declare that this pulse generator meets the intent of Directive 200 /108/EG 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
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and that this pulse generator meets the intent of the Low Voltage Directive 2006/95/EC.
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 2011/65/EU (RoHS)
We Avtech Electrosystems Ltd.
P.O. Box 5120, LCD Merivale
Ottawa, Ontario
Canada K2C 3H5
declare that, to the best of our knowledge, all electrical and electronic equipment (EEE)
sold by the company are in compliance with Directive 2011/65/EU of the European
Parliament and of the Council of 8 June 2011 on the restriction of the use of certain
hazardous substances in electrical and electronic equipment (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.
Material/Substance Threshold level
Lead (Pb) < 1000 ppm (0.1% by mass)
Mercury (Hg) < 1000 ppm (0.1% by mass)
Hexavalent Chromium (Cr6+) < 1000 ppm (0.1% by mass)
Polybrominated Biphenyls (PBB) < 1000 ppm (0.1% by mass)
Polybrominated Diphenyl ethers (PBDE) < 1000 ppm (0.1% by mass)
Cadmium (Cd) < 100 ppm (0.01% by mass)
Bis(2-ethylhexyl) phthalate (DEHP) < 1000 ppm (0.1% by mass)
Butyl benzyl phthalate (BBP) < 1000 ppm (0.1% by mass)
Dibutyl phthalate (DBP) < 1000 ppm (0.1% by mass)
Diisobutyl phthalate (DIBP) < 1000 ppm (0.1% by mass)
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/EC of the European Union and local
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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.
Requirements for WEEE compliance may include registration of products with local
governments, reporting of recycling activities to local governments, and financing of
recycling activities.
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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 - 2 0 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 IEC-320 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. 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:
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