Avtech AV-1023-C User manual

INSTRUCTIONS
MODEL AV-1023-C
±10 VOLT, 10 MHz
DUAL-CHANNEL
GENERAL PURPOSE PULSE GENERATOR
SERIAL NUMBER: 13964
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 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] (Intl)
Fax: [phone] (USA & Canada) or [phone] (Intl)
BOX 5120, LCD MERIVALE
OTTA A, CANADA K2C3H5

ARRANTY
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] (International)
Fax: [phone] (USA & Canada) or [phone] (International)
E-mail: [e-mail]
orld ide eb: http://www.avtechpulse.com
2

TABLE OF CONTENTS
WARRANTY......................................................................................................................2
TECHNICAL SUPPORT...................................................................................................2
TABLE OF CONTENTS....................................................................................................3
INTRODUCTION...............................................................................................................5
SPECIFICATIONS............................................................................................................6
REGULATORY NOTES....................................................................................................7
FCC PART 18.......................................................................................................................... 7
EC DECLARATION OF CONFORMITY..................................................................................7
DIRECTIVE 2011/65/EU (RoHS)............................................................................................8
DIRECTIVE 2002/ 6/EC (WEEE)............................................................................................8
INSTALLATION..............................................................................................................10
VISUAL CHECK....................................................................................................................10
POWER RATINGS................................................................................................................10
CONNECTION TO THE POWER SUPPLY...........................................................................10
PROTECTION FROM ELECTRIC SHOCKs.........................................................................11
ENVIRONMENTAL CONDITIONS........................................................................................12
FUSES.............................................................................................................................13
AC FUSE REPLACEMENT...................................................................................................13
DC FUSE REPLACEMENT...................................................................................................14
FUSE RATINGS.................................................................................................................... 14
FRONT PANEL CONTROLS..........................................................................................15
REAR PANEL CONTROLS............................................................................................18
GENERAL INFORMATION............................................................................................19
BASIC PULSE CONTROL....................................................................................................1
SUMMING OUTPUTS........................................................................................................... 20
OUTPUT IMPEDANCE.......................................................................................................... 21
MINIMI ING WAVEFORM DISTORTIONS....................................................................22
USE 50Ω TRANSMISSION LINES.......................................................................................22
USE LOW-INDUCTANCE LOADS........................................................................................22
MECHANICAL INFORMATION......................................................................................23
TOP COVER REMOVAL.......................................................................................................23
ELECTROMAGNETIC INTERFERENCE..............................................................................23
3

MAINTENANCE..............................................................................................................24
REGULAR MAINTENANCE..................................................................................................24
CLEANING............................................................................................................................ 24
WIRING DIAGRAMS.......................................................................................................25
WIRING OF AC POWER.......................................................................................................25
PCB 158R4 - LOW VOLTAGE POWER SUPPLY................................................................26
PCB 134B - MAIN BOARD...................................................................................................27
PCB 134B - MAIN BOARD - DC POWER............................................................................28
PCB 134B - MAIN BOARD - OSCILLATOR.........................................................................2
PCB 134B - MAIN BOARD - TIMING A................................................................................30
PCB 134B - MAIN BOARD - TIMING B................................................................................31
PCB 134B - MAIN BOARD - AMPLITUDE A........................................................................32
PCB 134B - MAIN BOARD - AMPLITUDE B........................................................................33
PCB 134B - MAIN BOARD - FRONT PANEL.......................................................................34
PERFORMANCE CHECK SHEET.................................................................................35
Manual Reference: /fileserver2/officefiles/instructword/av-1020/av-1023-c,ed4.odt.
Last modified March 25, 2020.
Copyright © 2020 Avtech Electrosystems Ltd, All Rights Reserved.
4

INTRODUCTION
The Avtech AV-1023-C is a versatile, general-purpose, low-cost, dual-channel 10 MHz
laboratory pulse generator, useful everywhere from undergraduate university
classrooms to the most advanced research and development laboratories. This pulse
generator features variable pulse repetition frequency (PRF), delays, pulse widths, and
amplitudes.
The generator can be triggered internally or externally. The internal trigger is
continuously variable from 1 Hz to 10 MHz. The delays and pulse widths are variable
up to 500 ms. The amplitudes are variable up to ±10V. Rise and fall times less than 10
ns (20%-80%).
The two main outputs (“A” and “B”) have all of their characteristics variable, and are
designed to drive 50Ω loads. A synchronizing trigger output (“SYNC”) is also supplied,
for triggering oscilloscopes and other test equipment (50 ns wide, +2V into 50Ω).
The two output channels can be summed together, if desired. One output connector
can supply either A or A+B, and the other can supply B or B+A.
This instrument is intended for use in research and development laboratories by
qualified personnel.
5

SPECIFICATIONS
Model: AV-1023-C
Number of channels out: Two
Pulse Repetition Rate: 1 Hz to 10 MHz
Amplitude (to 50 Ohms): 0 to ± 10 V (± 5 V if ZOUT = 50 Ω)
Pulse width (F HM): 50 ns to 0.5 sec
Rise & fall times (20%-80%): ≤ 10 ns
DC offset: 0 to ± 10 Volts (± 5 V if ZOUT = 50 Ω)
when used in summing mode with one channel's P set at “DC”
Source impedance: 1 Ohm or 50 Ohms
Polarity: Positive or negative
Duty cycle (maximum)1: 0 - 3 MHz: 80%,
3 - 5 MHz: 70%,
5 - 10 MHz: 50%,
100% in P DC mode
Overshoot, undershoot, ringing
and slope aberration:
< ± 3% at amplitudes of >300 mV
with outputs terminated in 50 Ω.
Propagation delay: 80 ns to 0.5 sec (Ext trig in to pulse out)
Trigger required (Ext trig
mode):
+ 5 Volts, > 40 ns (TTL)
Trig input impedance: 1 k Ω
Sync delay, jitter: 35 ns to 0.5 sec, ≤ ±50 ps or ±0.05%
(sync out to pulse out)
Sync output: +2 Volts, 50 ns, will drive 50 Ohm loads
Signal connectors: BNC
Power requirement: 100 - 240 Volts, 50 - 60 Hz
Dimensions (H x x D): 100 mm x 430 mm x 375 mm
(3.9” x 17” x 14.8”)
Chassis material: Anodized aluminum, with blue-grey plastic trim
Temperature range: +5°C to +40°C
Rack-mount kit: Optional. Specify -R5 option.
1)The outputs can be logically-complemented, effectively extending the duty cycle range.
6

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
e 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. Compliance pertains to the following specifications as
listed in the official Journal of the European Communities:
EN 50081-1 Emission
EN 50082-1 Immunity
7

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)
e 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 ( EEE)
European customers who have purchased this equipment directly from Avtech will have
completed a “ EEE Responsibility Agreement” form, accepting responsibility for EEE
compliance (as mandated in Directive 2002/96/EC of the European Union and local
8

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 EEE
compliance. Normally, such responsibilities with lie with the representative, unless other
arrangements (under Article 9) have been made.
Requirements for EEE compliance may include registration of products with local
governments, reporting of recycling activities to local governments, and financing of
recycling activities.
9

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.
PO ER RATINGS
This instrument is intended to operate from 100 - 240 V, 50 - 60 Hz.
The maximum power consumption is 57 atts. 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 PO ER 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.)
arning: 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:
10

Destination Region Description Option Manufacturer Part Number
United Kingdom, Hong Kong,
Singapore, Malaysia
BS 1363,
230V, 50 Hz -AC00 Qualtek 370001-E01
Australia, New Zealand AS 3112:2000,
230-240V, 50 Hz -AC01 Qualtek 374003-A01
Continental Europe, Korea,
Indonesia, Russia
European CEE 7/7
“Schuko” 230V, 50 Hz -AC02 Qualtek 364002-D01
North America, Taiwan NEMA 5-15,
120V, 60 Hz -AC03 Qualtek 312007-01
Switzerland SEV 1011,
230V, 50 Hz -AC06 Qualtek 378001-E01
South Africa, India SABS 164-1,
220-250V, 50 Hz -AC17 Volex 2131H 10 C3
Japan JIS 8303,
100V, 50-60 Hz -AC18 Qualtek 397002-01
Israel SI 32,
220V, 50 Hz -AC19 Qualtek 398001-01
China GB 1002-1 / 2099-1,
220V, 50 Hz -AC22 Qualtek 399012-01
PROTECTION FROM ELECTRIC SHOCKs
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 point. 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. herever 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.
11

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;
5. Mains supply voltage fluctuations up to ±10 % of the nominal voltage;
6. no pollution or only dry, non-conductive pollution.
12

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:
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:
13
Fuse
Drawer
Pry out the fuse
drawer using a
screwdriver.
Fuses #1 and #2
AC fuses)
Fuse #4
DC fuse)
Fuse #3
DC fuse)

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:
Fuses
Nominal
Mains
Voltage
Rating Case Size
Recommended Replacement Part
Littelfuse Part
Number
Digi-Key Stock
Number
#1, #2 (AC) 100-240V 0.5A, 250V,
Time-Delay 5×20 mm 0218.500HXP F2416-ND
#3 (DC) N/A 1.0A, 250V,
Time-Delay 5×20 mm 0218001.HXP F2419-ND
#4 (DC) N/A Not used.
A spare 1.0A fuse is installed here.
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.
14

FRONT PANEL CONTROLS
1. PO ER Switch . This is the main power switch. hen turning the instrument on,
there may be a delay of several seconds before the instrument appears to respond.
2. OVERLOAD Indicator . hen 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.
3. INT/EXT switch . In the "INT" position the instrument is internally triggered (i.e. the
pulse repetition frequency is controlled by the REPETITION RATE front panel
controls). In the "EXT" position the instrument is triggered by a TTL pulse (0 to +5V)
on the "TRIG" connector.
4. REPETITION RATE outer knob . This selects one of the seven pulse repetition rate
ranges:
1 Hz - 10 Hz
10 Hz - 100 Hz
100 Hz - 1 kHz
1 kHz - 10 kHz
15
3
8
1
2
4
5
6
7
9
11
10
12
13
14
15
16
17
18
19
21
20
22
23
24
25 26

10 kHz - 100 kHz
100 kHz - 1 MHz
1 MHz - 10 MHz
5. REPETITION RATE inner knob . This varies the pulse repetition rate within the
selected range.
6. PULSE DELAY A outer knob . This selects one of the seven delay ranges for
channel "A":
0.05 ms - 0.5 ms
0.5 ms - 5 ms
5 ms - 50 ms
50 ms - 500 ms
500 ms - 5 ms
5 ms - 50 ms
50 ms - 0.5 sec
7. PULSE DELAY A inner knob . This varies the channel "A" delay within the selected
range.
8. PULSE DELAY B outer knob . This selects one of the seven delay ranges for
channel "B".
9. PULSE DELAY B inner knob . This varies the channel "B" delay within the selected
range.
10.PULSE IDTH A outer knob . This selects one of the seven pulse width ranges for
channel "A":
0.05 ms - 0.5 ms
0.5 ms - 5 ms
5 ms - 50 ms
50 ms - 500 ms
500 ms - 5 ms
5 ms - 50 ms
50 ms - 0.5 sec
DC (i.e. constant output)
11.PULSE IDTH A inner knob . This varies the channel "A" pulse width within the
selected range.
12.PULSE IDTH B outer knob . This selects one of the seven pulse width ranges for
channel "B".
13.PULSE IDTH B inner knob . This varies the channel "B" pulse width within the
selected range.
14.AMPLITUDE A outer knob . This switch selects the output polarity (positive or
negative) of channel "A".
16

15.AMPLITUDE A inner knob . This varies the output amplitude of channel "A" between
0 and 10 Volts.
16.AMPLITUDE B outer knob . This switch selects the output polarity (positive or
negative) of channel "B".
17.AMPLITUDE B inner knob . This varies the output amplitude of channel "B" between
0 and 10 Volts.
18.NORM/COMP A switch . In the "NORM" position, channel "A" is logically non-
inverted. In the "COMP" position, channel "A" is logically complemented (i.e.
inverted). In the complemented state, the high and low voltage levels are reversed
relative to the "NORM" state. The polarities do not change.
19.NORM/COMP B switch . In the "NORM" position, channel "B" is logically non-
inverted. In the "COMP" position, channel "B" is logically complemented (i.e.
inverted). In the complemented state, the high and low voltage levels are reversed
relative to the "NORM" state. The polarities do not change.
20.A/A+B switch . In the "A" position, the leftmost OUT connector (item 23) outputs
channel "A". In the "A+B" position, this connector provides the sum of channels "A"
and "B" instead.
21.B/B+A switch . In the "B" position, the rightmost OUT connector (item 24) outputs
channel "B". In the "B+A" position, this connector provides the sum of channels "B"
and "A" instead.
22.ZOUT switch . This switch sets the output impedance of the two main outputs (items
23 and 24). The output impedance can be 1 or 50 .
23.OUT, left connector . This connector provides either "A" or "A+B" outputs, depending
on this position of the A/A+B switch. The output impedance is set by the ZOUT
switch.
24.OUT, right connector . This connector provides either "B" or "B+A" outputs,
depending on this position of the B/B+A switch. The output impedance is set by the
ZOUT switch.
25.SYNC connector . This output supplies a TTL-level pulse to trigger oscilloscopes or
other measurement equipment. The output pulse width is nominally fixed at 50ns.
26.TRIG connector . If the INT/EXT switch (item 3) is in the "EXT" position, the external
TTL-level trigger should be applied to this input. hen the INT/EXT switch is in the
"INT" position, this input has no effect. However, it should be left unconnected to
avoid electromagnetic interference with the internal clock.
17

REAR PANEL CONTROLS
1. AC PO ER 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.
2. AC FUSE DRA ER . The two fuses that protect the AC input are located in this
drawer. Please see the “FUSES” section of this manual for more information.
3. DC FUSES . These two fuses protect the internal DC power supplies. Please see the
“FUSES” sections of this manual for more information.
18
2
31

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, three output channels respond to the trigger: A, B, and SYNC.
A . This is the main signal for left OUT connector. The pulse width, amplitude,
and offset are all adjustable. The maximum output voltage is ±10V. (This voltage
is reduced by a factor of two if the output impedance is set at 50Ω, and a 50Ω
load is used.)
B . This is the main signal for right OUT connector. The pulse width, amplitude,
and offset are all adjustable. The maximum output voltage is ±10V. (This voltage
is reduced by a factor of two if the output impedance is set at 50Ω, and a 50Ω
load is used.)
SYNC . The SYNC pulse is a fixed-width TTL-level reference pulse used to
trigger oscilloscopes or other measurement systems. It precedes all other
outputs.
These pulses are illustrated below, assuming internal triggering and a non-zero delay
setting:
19
SYNC OUT
(generated by the
internal oscillator)
50 ns, FIXED
A
A PA DELAY
AMPLITUDE A, VARIABLE
(POSITIVE MODE SHO N)
2V, FIXED
B
B PB DELAY
AMPLITUDE B, VARIABLE
(NEGATIVE MODE SHO N)

The next figure illustrates the relationship between the signals when an external TTL-
level trigger is used (i.e., the INT/EXT switch is set to “EXT”):
SUMMING OUTPUTS
The two output connectors can supply A and B directly, or they can be added together,
and the two output connectors can be used to supply two of A, B, or A+B=B+A. This
allows complex waveforms to be constructed. Some examples are shown below.
20
SYNC OUT
(generated by the
internal oscillator)
50 ns, FIXED
A
A PA DELAY
AMPLITUDE A, VARIABLE
(POSITIVE MODE SHO N)
2V, FIXED
B
B PB DELAY
AMPLITUDE B, VARIABLE
(NEGATIVE MODE SHO N)
TRIG
input
3-5V, TTL LEVELS
> 40 ns
PROPAGATION DELAY
A
B
A+B
A
B
A+B