Operating Manual: AVMM-2 Module Ultra High Speed Pulse Generator (188 kB, 2011-07-14)

Operating Manual: AVMM-2 Module Ultra High Speed Pulse Generator (188 kB, 2011-07-14)
AVTECH
ELECTROSYSTEMS
N A N O S E C O N D
P.O. BOX 265
OGDENSBURG, NY
U.S.A. 13669-0265
W A V E F O R M E L E CT RO NI C S
SI N C E 1 9 7 5
TEL: 888-670-8729 (USA & Canada) or +1-613-686-6675 (Intl)
FAX: 800-561-1970 (USA & Canada) or +1-613-686-6679 (Intl)
info@avtechpulse.com
-
LTD.
http://www.avtechpulse.com/
INSTRUCTIONS
MODELS AVMM-1, AVMM-2
0 to 2V (AVMM-1) or 5V (AVMM-2), 25 MHz
HIGH SPEED PULSE GENERATOR MODULE
WITH 300 ps RISE TIME
SERIAL NUMBER: ____________
X
BOX 5120, LCD MERIVALE
OTTAWA, ONTARIO
CANADA K2C 3H4
2
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: 888-670-8729 (USA & Canada) or +1-613-686-6675 (International)
Fax: 800-561-1970 (USA & Canada) or +1-613-686-6679 (International)
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...............................................................................................................4
AVAILABLE OPTIONS.....................................................................................................5
SPECIFICATIONS.............................................................................................................6
REGULATORY NOTES....................................................................................................7
FCC PART 18.......................................................................................................................... 7
EC DECLARATION OF CONFORMITY..................................................................................7
DIRECTIVE 2002/95/EC (RoHS).............................................................................................8
DIRECTIVE 2002/96/EC (WEEE)............................................................................................8
BASIC TEST ARRANGEMENT........................................................................................9
CONTROLS - FRONT............................................................................................................. 9
CONTROLS - REAR.............................................................................................................. 10
GENERAL OPERATING NOTES..........................................................................................10
PERFORMANCE CHECK SHEET.................................................................................12
Manual Reference: /fileserver/officefiles/instructword/avmm/avmm-2, avmm-1, module, edH.odt.
Last modified July 14, 2011.
Copyright © 2011 Avtech Electrosystems Ltd, All Rights Reserved.
4
INTRODUCTION
The AVMM-1 and AVMM-2 models are high performance DC-powered pulse
generators module capable of generating 1 to 10 ns pulses into 50Ω loads at repetition
rates up to 25 MHz. The rise time is less than 300 ps, and the fall time is less than 600
ps.
Instruments with the "-P" model suffix can generate 0 to +2V (AVMM-1) or +5V (AVMM2), whereas instruments with the "-N" model suffix can generate 0 to -2V (AVMM-1) or
-5V (AVMM-2).
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, development, test and calibration
laboratories by qualified personnel.
5
AVAILABLE OPTIONS
The AVMM-1 and AVMM-2 are available with several options:
-D Option: this option adds a 0-5 ns adjustable delay feature, which operates in both
the internal and external trigger modes.
-EA Option: the output amplitude can be controlled by an externally generated 0 to
+10V analog control voltage.
-ED Option: the 0-5 ns delay can be controlled by an externally generated 0 to +10V
analog control voltage. Units with the -ED option incorporate the -D option as well.
-EW Option: the output pulse width can be controlled by an externally generated 0 to
+10V analog control voltage.
-M Option: a monitor output is provided.
-TR Option: variable rise/fall time option. Permits the rise time to be varied from 300 ps
to 2.0 ns via a five-position switch. The TR switch also affects the fall time.
-M1 Option: AVMM-2 modules produced before December 2006 normally consisted of
two inter-connected modules (the main module and a smaller “output” module). The
-M1 option changed the packaging to eliminate the smaller of the two modules. AVMM2 modules produced in or after December 2006 now include this simplified packaging
as a standard feature,
6
SPECIFICATIONS
Model:
Amplitude3,4: (into 50 Ohm load)
Pulse width (FWHM) 3:
PRF:
Rise time2 (20% - 80%):
Fall time2 (80% - 20%):
Polarity5:
Propagation delay:
Variable propagation delay option 3,6:
Jitter:
Trigger required:
Monitor output option8:
Connectors:
Dimensions (H x W x D):
Power requirement:
Chassis material:
Temperature range:
1)
2)
3)
4)
5)
6)
7)
8)
AVMM-1
Variable to 2 Volts
AVMM-2
Variable to 5 Volts
Variable 1 to 10 ns
0 to 25 MHz
300 ps or variable 300 ps to 2.0 ns2
600 ps or variable 600 ps to 2.0 ns2
Positive or negative (specify)
≤ 30 ns (Ext trig in to pulse out)
0 to 5 ns
± 15 ps (Ext trig in to pulse out)
TTL-level8 (Low: 0V, High: +3V to +5V), 10 ns or wider.
≥ 1 kΩ input impedance.
Provides a 20 dB attenuated coincident replica of main output
In, Out: SMA, Power: Solder terminals
43 x 66 x 107 mm (1.7” x 2.6” x 4.2”)
+24V DC.
Cast aluminum, blue enamel
+5°C to +40°C
-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 http://www.avtechpulse.com/formats for additional details of the basic formats).
For rise times variable from 300 ps to 2.0 ns via a five-position switch add suffix
-TR. TR switch also affects fall time.
For electronic control (0 to +10V) of amplitude, pulse width, delay or offset suffix model number with -EA or -EW or -ED or -EO.
Electronic control units also include the standard front panel one-turn controls.
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.
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. (-PN available only for -C units).
Indicate delay option by suffixing model number with -D.
For internally generated DC offset option (0 to ±5 V, one turn control) add suffix -OT to model number. -OT and -EO options not
available on modules.
For monitor option add suffix -M.
7
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. 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 (info@avtechpulse.com) 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 (info@avtechpulse.com) if you require assistance.
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 specifications as
listed in the official Journal of the European Communities:
EN 50081-1 Emission
EN 50082-1 Immunity
8
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/EC of the European Union and
local 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.
9
BASIC TEST ARRANGEMENT
SYNC OUTPUT
TTL-LEVEL
LOGIC
PULSER
+3V to +5V (TTL)
0V
PW > 10 ns
PRF ≤ 25 MHz
MAIN OUTPUT
50Ω FEED-THROUGH
TERMINATOR
(OPTIONAL, BUT
RECOMMENDED)
AVTECH
AVMM
PULSER
SAMPLING
OSCILLOSCOPE
BW > 10 GHz
IN
CONNECTOR
+24V DC
POWER
SUPPLY
OUT
CONNECTOR
50 OHM INPUT
40 dB
ATTENUATOR
TRIG
ALL CABLES: 50 OHM COAXIAL
CONTROLS - FRONT
Standard modules have “AMP” and “PW” trimpots that may be adjusted using a
screwdriver.
Units with the -EA option will have a solder terminal to control the amplitude, rather
than a screwdriver-adjustable trimpot. The amplitude is then controlled by a 0 to +10V
DC voltage applied to the solder terminal.
Units with the -EW option will have a solder terminal to control the pulse width, rather
than a screwdriver-adjustable trimpot. The pulse width is then controlled by a 0 to +10V
DC voltage applied to the solder terminal.
Units with the -D option will have an additional screwdriver-adjustable trimpot, which
controls the 0 to 5 ns delay feature. Units with the -ED option will have a solder
terminal to control the 0 to 5 ns delay, rather than a screwdriver-adjustable trimpot. The
0 to 5 ns delay is then controlled by a 0 to +10V DC voltage applied to the solder
terminal.
Units with the -M option will have an additional SMA output connector.
10
An example of an AVMM-2-EA-EW is shown below:
CONTROLS - REAR
The location of the power terminals are shown in the photo below.
GENERAL OPERATING NOTES
1) The bandwidth capability of components and instruments used to display the pulse
generator output signal (attenuators, cables, connectors, etc.) should exceed 10
GHz.
11
2) The use of 40 dB attenuator on the output will ensure a peak input signal to the
sampling scope of less than one volt.
3) In general, the source pulse generator trigger delay control should be set in the 0.1
to 1.0 us range, for proper positioning of the output pulse on the sampling
oscilloscope display.
4) When testing using a general purpose 50 ohm laboratory pulse generator as the
input trigger signal source, the input signal should be applied via a 50 ohm feedthrough terminator, or alternatively the input to the AVM unit should be shunted
with a 50 ohm resistor. This will prevent reflection (and degradation of the input
pulse waveform) caused by the high impedance at the IN port. When triggering
from a TTL source, no 50 ohm feed-through load or resistor is necessary but lead
length should be as short as possible. High-speed TTL Schottky logic is
recommended for the driving circuitry.
5) The input trigger pulse width should be greater than 10 ns and less than one half of
the pulse repetition frequency period. The unit triggers on the leading edge of the
input trigger signal.
6) The output pulse width is controlled by means of the one-turn potentiometer (PW).
The pot should initially be set maximum clockwise and the pulse width adjusted
using an oscilloscope.
7) The output pulse amplitude is controlled by means of the one-turn potentiometer
(AMP). The pulse width may change by several nanoseconds as the output
amplitude is reduced from maximum to minimum. Therefore it is convenient to first
set the desired amplitude and then set the desired pulse width. Rotation of the PW
pot causes the position of the falling edge of the pulse to change.
8) The output pulse position or delay can be varied for up to 5 ns by means of the
delay (DELAY) control. Rotating the delay control clockwise increases the delay.
If the full 5 ns delay cannot be achieved then the input pulse width should be
increased by a few nanoseconds. (Option)
9) It is recommended that the module be bolted to a heatsink, for cooling purposes.
This will improve the stability of the output, by reducing thermal drift.
10) WARNING: The module may fail if triggered at a PRF greater than 25 MHz.
11) To DC offset the output pulse connect a DC power supply set to required DC offset
value to the terminals marked “OS”. The maximum attainable DC offset voltage is
+50 volts. (Option).
12) The monitor output port (M) provides a coincident attenuated (÷10) replica of the
main output to a 50 ohm load. (Option).
12
PERFORMANCE CHECK SHEET
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