Avtech AVR-3-PW-TEK3-B User manual

INSTRUCTIONS
MODEL AVR-3-PW-TEK3-B
250V / 5A, 10 ns RISE TIME,
50V / 1A, 0.5 ns RISE TIME
DUAL-OUTPUT PULSE GENERATOR
OR CURRENT PROBE TESTS
SERIAL NUMBER: ____________
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 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
OGDENSBURG, NY
U.S.A. 13669-0265
TEL: [phone] (USA & Canada) or [phone] (Intl)
AX: 800-561-1970 (USA & Canada) or [phone] (Intl)
[e-mail] - http://www.avtechpulse.com/
X
BOX 5120, LCD MERIVALE
OTTAWA, ONTARIO
CANADA K2C 3H5

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] (International)
ax: 800-561-1970 (USA & Canada) or [phone] (International)
E-mail: [e-mail]
World Wide Web: http://www.avtechpulse.com
2

TABLE O CONTENTS
WARRANTY......................................................................................................................2
TECHNICAL SUPPORT...................................................................................................2
TABLE OF CONTENTS....................................................................................................3
INTRODUCTION...............................................................................................................5
SPECIFICATIONS............................................................................................................7
REGULATORY NOTES....................................................................................................8
FCC PART 18.......................................................................................................................... 8
EC DECLARATION OF CONFORMITY..................................................................................8
DIRECTIVE 2011/65/EU (RoHS)............................................................................................9
DIRECTIVE 2002/96/EC ( EEE)............................................................................................9
FIRM ARE LICENSING.......................................................................................................10
INSTALLATION..............................................................................................................11
VISUAL CHECK....................................................................................................................11
PO ER RATINGS................................................................................................................11
CONNECTION TO THE PO ER SUPPLY...........................................................................11
PROTECTION FROM ELECTRIC SHOCK...........................................................................12
ENVIRONMENTAL CONDITIONS........................................................................................13
FUSES.............................................................................................................................14
AC FUSE REPLACEMENT...................................................................................................14
DC FUSE REPLACEMENT...................................................................................................15
FUSE RATINGS.................................................................................................................... 15
FRONT PANEL CONTROLS..........................................................................................16
REAR PANEL CONTROLS............................................................................................18
GENERAL INFORMATION............................................................................................20
BASIC TEST ARRANGEMENT, ITHOUT OUTPUT MODULES.......................................20
BASIC TEST ARRANGEMENT, ITH OUTPUT MODULES...............................................21
OUTPUT MODULE EQUIVALENT CIRCUIT........................................................................23
-CT OPTION (AVX-TEK3-CT3).............................................................................................24
BASIC PULSE CONTROL....................................................................................................24
TRIGGER MODES................................................................................................................ 26
GATING MODES...................................................................................................................27
REPLACEMENT CABLES....................................................................................................27
UNUSED OUTPUTS..............................................................................................................27
3

TYPICAL RESULTS.......................................................................................................28
OUT1..................................................................................................................................... 28
OUT2..................................................................................................................................... 29
MEASUREMENT ACCURACY AND CALIBRATION....................................................32
VOLTAGE AMPLITUDE CALIBRATION..............................................................................32
LOAD RESISTANCE CALIBRATION...................................................................................32
OPERATIONAL CHEC .................................................................................................33
PROGRAMMING YOUR PULSE GENERATOR............................................................36
KEY PROGRAMMING COMMANDS....................................................................................36
ALL PROGRAMMING COMMANDS.....................................................................................37
MECHANICAL INFORMATION......................................................................................39
TOP COVER REMOVAL.......................................................................................................39
RACK MOUNTING................................................................................................................ 39
ELECTROMAGNETIC INTERFERENCE..............................................................................39
MAINTENANCE..............................................................................................................40
REGULAR MAINTENANCE..................................................................................................40
CLEANING............................................................................................................................ 40
WIRING DIAGRAMS.......................................................................................................41
IRING OF AC PO ER.......................................................................................................41
PCB 158R4 - LO VOLTAGE PO ER SUPPLY................................................................42
PCB 235B - HIGH VOLTAGE DC PO ER SUPPLY...........................................................43
PCB 284B - HIGH VOLTAGE DC PO ER SUPPLY ITH DISCHARGE...........................44
PCB 183A - CAPACITOR BANKS........................................................................................45
PCB 241B - DUAL CHANNEL PULSE IDTH BOARD.......................................................46
PCB 104F - KEYPAD / DISPLAY BOARD, 1/3....................................................................47
PCB 104F - KEYPAD / DISPLAY BOARD, 2/3....................................................................48
PCB 104F - KEYPAD / DISPLAY BOARD, 3/3....................................................................49
MAIN IRING.......................................................................................................................50
PERFORMANCE CHEC SHEET.................................................................................51
Manual Reference: /fileserver2/officefiles/instructword/avr-3/AVR-3-PW-TEK3-B,ed6.odt.
Last modified September 12, 2018.
Copyright © 2018 Avtech Electrosystems Ltd, All Rights Reserved.
4

INTRODUCTION
The AVR-3-PW-TEK3-B series is specifically designed for testing Tektronix current
probes. Two main output channels are provided.
One output provides 10 ns rise time voltage pulses (up to 250V, 250 ns to 250 us),
suitable for testing A6303 or TCP303 probes. A 50Ω termination is provided inside a
supplied output module. A variable current of up to 5 Amperes is defined by the 250
Volt pulse and the 50Ω termination. or other applications, the output pulse may be
connected to a user-supplied 50Ω load, if desired.
The second output is intended for testing lower-current, higher-speed current probes. It
can generate pulse amplitudes up to 50V and 1A, with 0.5 ns rise times. The pulse
width is variable from 50 ns to 200 ns.
The two outputs allow this model to test both high-speed lower-current probes such as
the TCP312 or TCP305, and lower-speed high-current probes such as the A6303 or
TCP303.
An external output module is provided for each output. Replaceable flexible shorting
cables are mounted on these output modules. (The shorting cables are standard RG-
316 coaxial cables.) During tests, the output module are connected to the mainframe by
a 12" / 30 cm length of coaxial cable, and the current probes are clamped around the
shorting cables. The output modules also contain the 50 Ohm termination.
The supplied cables and output modules are designed to preserve the fast rise and falls
times as much as possible, despite the parasitic inductance introduced by the probes
and the unshielded connections (i.e., imperfect transmission lines) required to measure
current flow.
The AVR-3-PW-TEK3-B is optionally available with an additional output module that is
physically suitable for use with the Tektronix CT-1 and CT-2 ultra-fast (i.e., sub-
nanosecond rise time) current probes.
Instruments with the "-P" model suffix can generate positive output voltages (and thus
source current), whereas instruments with the "-N" model suffix can generate negative
voltages (and thus sink current).
The AVR-3-PW-TEK3-B is a highly flexible instrument. Aside from the internal trigger
source, it can also be triggered or gated by external TTL-level signals. A front-panel
pushbutton or a computer command can also be used to trigger the instrument.
The AVR-3-PW-TEK3-B features front panel keyboard and adjust knob control of the
output pulse parameters along with a four line by 40 character back-lit LCD display of
the output amplitude, pulse width, pulse repetition frequency, and delay. The instrument
includes memory to store up to four complete instrument setups. The operator may use
5

the front panel or the computer interface to store a complete “snapshot” of all key
instrument settings, and recall this setup at a later time.
This instrument is intended for use in research, development, test and calibration
laboratories by qualified personnel.
6

SPECI ICATIONS
Model: AVR-3-PW-TEK3-B2
Basic Description: High and low current "combo" pulser,
with GPIB / RS-232
Number of Outputs: 2
Output 1 Output 2
Amplitude (RL ≥ 50 Ω)3,4: 10 to 250 V 10 to 50V
Amplitude accuracy: Greater of ±2% or ±0.5V.
Provided termination: 50.0 ± 1%
Voltage rise & fall times: ≤ 10 ns (20%-80%) ≤ 0.5 ns (20%-80%)
Pulse width ( WHM): 250 ns to 250 us 50 to 200 ns
Droop (at max. pulse width): ≤ 2%
Overshoot (at max. amp.): ≤ 5%
PR : Internal trigger: 1 Hz to 10 kHz, External trigger: 0 Hz to 10 kHz
Duty cycle (max): 0.25% 0.2%
Polarity5: Positive or negative (specify)
Propagation delay: ≤ 150 ns (Ext trig in to pulse out)
Jitter: ± 100 ps ± 0.03% of sync delay (Ext trig in to pulse out)
Output connector: BNC SMA
Probe attachment style: lexible clamping cable on output module6. The output module is
connected to the front panel by a 12" / 30 cm coaxial cable.
Trigger modes: Internal trigger, external trigger (TTL-level pulse, > 10 ns, 1 kΩ input impedance),
front-panel “Single Pulse” pushbutton, or single pulse trigger via computer command.
Variable delay:
(Sync to main out) 0 to 1.0 seconds, for all trigger modes (including external trigger). Common to all outputs.
Sync output (will drive 50Ω): +3 Volts, 100 ns
Gated operation: Synchronous, active high or low, switchable.
GPIB and RS-232 control2: Standard feature on all -B units.
Ethernet port, for remote
control using VXI-11.3, ssh,
telnet, & web:
Optional7. Recommended as a modern alternative to GPIB / RS-232.
See http://www.avtechpulse.com/options/vxi for details.
LabView drivers: Check for available downloads at http://www.avtechpulse.com/labview.
Power requirements: 100 - 240 Volts, 50 - 60 Hz
Dimensions: 100 mm x 430 mm x 375 mm (3.9” x 17” x 14.8”)
Mounting: Any. Add -R5 to the model number to add a rack-mount kit.
Temperature range: +5°C to +40°C
1) -C suffix indicates stand-alone lab instrument with internal clock and line powering. (See http://www.avtechpulse.com/formats for the basic instrument formats). Not
recommended for new designs. Use -B versions instead.
2) -B suffix indicates IEEE-488.2 GPIB and RS-232 control of amplitude, pulse width, PR and delay (See http://www.avtechpulse.com/gpib).
3) or operation at amplitudes of less than 10% of full-scale, best results will be obtained by setting the amplitude near full-scale and using external attenuators on the
output.
4) The amplitude of the AVR-3-PW-TEK2-C may also be controlled by a 0 to +10V DC voltage applied to a rear-panel BNC connector, in addition to the standard front-panel
controls.
5) Indicate desired polarity by suffixing model number with -P or -N (i.e. positive or negative).
6) An optional additional output module is available for "Output 2" of the AVR-3-PW-TEK3-B, which is suitable for use with CT-1 and CT-2 current probes. This output module
uses a very short length of de-solderable bus-bar wire (instead of flexible cable) which must be fed through the probe. Add the suffix "-CT" to the model number to specify
this option.
7) Add the suffix -VXI to the model number to specify the Ethernet port.
7

REGULATORY NOTES
CC PART 18
This device complies with part 18 of the CC 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 O CON ORMITY
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 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
8

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)
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
9

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.
IRMWARE LICENSING
Instruments with firmware versions 5.00 or higher use open-source software internally.
Some of this software requires that the source code be made available to the user as a
condition of its licensing. This source code is available upon request (contact
[email protected]om).
Earlier firmware versions do not contain any open source software.
10

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 the following items have been supplied with the instrument:
•A power cord
•A GPIB cable
•Two instrumentation manuals (this manual and the “Programming Manual for -B
Instruments”)
•Two output modules (AVX-TEK3-TM1 and AVX-TEK3-TM2), with a 6" / 15 cm
length of RG-316 installed across the "A" and "B" connectors of each module.
•A 12" / 30 cm length of RG-58 coaxial cable.
•A 12" / 30 cm length of RG-316 coaxial cable.
Instruments with the -CT option will also include:
•One AVX-TEK3-TM3 output module (a small PCB)
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 “ USES” 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.)
11

Warning: ailure 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:
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,
220V, 50 Hz -AC22 Volex 2137H 10 C3
PROTECTION ROM ELECTRIC SHOCK
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. Wherever possible, use shielded connectors and cabling.
3. Connect and disconnect loads and cables only when the instrument is turned off.
12

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.
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.
13

USES
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 USE 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:
14
Fuses #1 and #2
(AC fuses)
Fuse #4
(DC fuse)
Fuse #
(DC fuse)
Fuse
Drawer
Pry out the fuse
drawer using a
screwdriver.

DC USE 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.
USE RATINGS
The following table lists the required fuses:
uses
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 2416-ND
#3 (DC) N/A 1.0A, 250V,
Time-Delay 5×20 mm 0218001.HXP 2419-ND
#4 (DC) N/A 1.0A, 250V,
Time-Delay 5×20 mm 0218001.HXP 2419-ND
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.
15

RONT 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.
If the main menu does not appear after 30 seconds, turn off the instrument and
leave it off for at least 60 seconds before applying power again.
2. OVERLOAD Indicator . When 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
abOUT1 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. OUT1 CONNECTOR . This BNC connector provides the 250V/5A (maximum) output
with 10 ns rise times. It is normally connected to the AVX-TEK3-TM1 output module
using a 12" / 30 cm length of RG-58 coaxial cable.
4. OUT2 CONNECTOR . This SMA connector provides the 50V/1A (maximum) output
with 0.5 ns rise times. It is normally connected to the AVX-TEK3-TM2 or AVX-TEK3-
TM3 output modules using a 12" / 30 cm length of RG-316 coaxial cable.
16
2
3
5
67
1
4

5. SYNC OUT . This connector supplies a SYNC output that can be used to trigger
other equipment, particularly oscilloscopes. This signal leads (or lags) the main
outputs by a duration set by the "DELAY" controls and has an approximate
amplitude of +3 Volts to RL > 50Ω with a pulse width of approximately 100 ns.
6. LIQUID CRYSTAL DISPLAY (LCD) . This LCD is used in conjunction with the
keypad to change the instrument settings. Normally, the main menu is displayed,
which lists the key adjustable parameters and their current values. The
“Programming Manual for -B Instruments” describes the menus and submenus in
detail.
7. KEYPAD .
Control Name unction
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.
×10 If one of the adjustable numeric parameters is displayed, this
increases the setting by a factor of ten.
÷10 If one of the adjustable numeric parameters is displayed, this
decreases the setting by a factor of ten.
+/- If one of the adjustable numeric parameters is displayed, and
this parameter can be both positive or negative, this changes
the sign of the parameter.
EXTRA INE This changes the step size of the ADJUST knob. In the extra-
fine mode, the step size is twenty times finer than in the normal
mode. This button switches between the two step sizes.
ADJUST This large knob adjusts the value of any displayed numeric
adjustable values, such as frequency, pulse width, etc. The
adjust step size is set by the "EXTRA INE" button.
When the main menu is displayed, this knob can be used to
move the arrow pointer.
17

REAR PANEL CONTROLS
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.
2. AC USE DRAWER . The two fuses that protect the AC input are located in this
drawer. Please see the “ USES” section of this manual for more information.
3. DC USES . These two fuses protect the internal DC power supplies. Please see the
“ USES” sections of this manual for more information.
4. GATE . This TTL-level (0 and +5V) logic input can be used to gate the triggering of
the instrument. This input can be either active high or active low, depending on the
front panel settings or programming commands. (The instrument triggers normally
when this input is unconnected). When set to active high mode, this input is pulled-
down to ground by a 1 kΩ resistor. When set to active low mode, this input is pulled-
up to +5V by a 1 kΩ resistor.
5. TRIG . This TTL-level (0 and +5V) logic input can be used to trigger the instrument, if
the instrument is set to triggering externally. The instrument triggers on the rising
edge of this input. 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.com) PE6008-50 BNC feed-thru 50
Ohm terminator is suggested for this purpose.)
18
86
3
51
4
2
7
GATE
RS-232
GPIB
TRIG

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. A user
name (“admin”) and a password (“default”, as shipped from the factory) are required
when logging into a serial terminal session. The internal controller attempts to auto-
sense the parity setting. It may be necessary to send a few return characters before
attempting a login in order to provide enough data to allow this auto-sensing to work.
(A standard Linux “agetty” process is used to implement serial control internally.) See
the “Programming Manual for -B Instruments” for more details on RS-232 control.
8. Network Connector . (Optional feature. Active on -VXI units only.) This Ethernet
connector allows the instrument to be remotely controlled using the VXI-11.3, ssh
(secure shell), telnet, and http (web) protocols. See the “Programming Manual for -B
Instruments” for more details.
19

GENERAL IN ORMATION
BASIC TEST ARRANGEMENT, WITHOUT OUTPUT MODULES
or initial testing of the AVR-3-PW-TEK3-B, the instrument can be operated without the
output modules. Both outputs require a 50 Ohm load. OUT1 can be observed on a
common "real-time" oscilloscope with a bandwidth of 200 MHz or higher, since the rise
time is approximately 10 ns. However, OUT2 should be observed with a high-bandwidth
(> 2 GHz) sampling oscilloscope in order to accurately reproduce the very fast (< 500
ps) rise time.
or testing OUT1 with a real-time oscilloscope, the instrument should be connected as
shown below:
A high-quality low-inductance 50 Ohm load is required for the above test arrangement.
The worst case power dissipation in the load resistor is 3.1 Watts.
or testing OUT2 with a high-bandwidth sampling oscilloscope, the instrument should
be connected as shown below:
20
AVTECH
AVR-3-P -TEK3-B
OUT1
SYNC
OUTPUT
AC
POWER
ALL CABLES: 50 OHM COAXIAL
REAL-TIME
OSCILLOSCOPE
CHANNEL A
TRIG
INPUT
SCOPE
PROBE
50Ω
TEST
LOAD
OUT2