Avtech AVOZ-D2-B User manual

INSTRUCTIONS
MODEL AVOZ-D2-B
0 TO 700 VOLT, 70 AMP
PULSE GENERATOR
WITH IEEE 488.2 AND RS-232 CONTROL
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 F 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)
FAX: [phone] (USA & Canada) or [phone] (Intl)
[e-mail] - http://www.avtechpulse.com/
X
BOX 5120, LCD MERIVALE
OTTAWA, ONTARIO
CANADA K2C 3H4

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

TABLE OF CONTENTS
WARRANTY......................................................................................................................2
TECHNICAL SUPPORT...................................................................................................2
TABLE OF CONTENTS....................................................................................................3
INTRODUCTION...............................................................................................................5
AVAILABLE OPTIONS.....................................................................................................6
SPECIFICATIONS............................................................................................................7
REGULATORY NOTES....................................................................................................8
FCC PART 18..........................................................................................................................8
EC DECLARATION OF CONFORMITY..................................................................................8
DIRECTIVE 2002/95/EC (RoHS).............................................................................................9
DIRECTIVE 2002/96/EC (WEEE)............................................................................................9
AC POWER S PPLY REG LATORY NOTES.....................................................................10
INSTALLATION..............................................................................................................11
VIS AL CHECK....................................................................................................................11
POWER RATINGS................................................................................................................11
CONNECTION TO THE POWER S PPLY...........................................................................11
PROTECTION FROM ELECTRIC SHOCK...........................................................................12
ENVIRONMENTAL CONDITIONS.........................................................................................13
LABVIEW DRIVERS..............................................................................................................13
FUSES.............................................................................................................................14
AC F SE REPLACEMENT...................................................................................................14
DC F SE REPLACEMENT...................................................................................................15
F SE RATINGS.................................................................................................................... 15
FRONT PANEL CONTROLS..........................................................................................16
REAR PANEL CONTROLS............................................................................................18
GENERAL INFORMATION............................................................................................2
BASIC P LSE CONTROL....................................................................................................20
TRIGGER MODES................................................................................................................22
P LSE WIDTH MODES........................................................................................................22
GATING MODES...................................................................................................................22
AMPLIT DE DECAY TIME...................................................................................................23
THE LOAD AND O TP T MOD LE....................................................................................23
B RST GENERATION (-BR OPTION)..................................................................................24
3

PREVENTING O TP T STAGE FAIL RE...........................................................................26
OPERATIONAL CHECK.................................................................................................27
PROGRAMMING YOUR PULSE GENERATOR...........................................................3
KEY PROGRAMMING COMMANDS....................................................................................30
ALL PROGRAMMING COMMANDS.....................................................................................31
MECHANICAL INFORMATION......................................................................................33
TOP COVER REMOVAL.......................................................................................................33
RACK MO NTING................................................................................................................ 33
ELECTROMAGNETIC INTERFERENCE..............................................................................33
MAINTENANCE..............................................................................................................34
REG LAR MAINTENANCE..................................................................................................34
CLEANING............................................................................................................................ 34
WIRING DIAGRAMS.......................................................................................................35
WIRING OF AC POWER.......................................................................................................35
WIRING OF DC POWER.......................................................................................................36
PCB 158N - LOW VOLTAGE POWER S PPLY, 1/3............................................................37
PCB 158N - LOW VOLTAGE POWER S PPLY, 2/3............................................................38
PCB 158N - LOW VOLTAGE POWER S PPLY, 3/3............................................................39
PCB 170 - HIGH-VOLTAGE POWER S PPLY (-PN AND -N NITS)..................................40
PCB 197A - HIGH-VOLTAGE POWER S PPLY (-P NITS)...............................................41
PCB 183A-S AND 183A-P CAPACITOR BANKS.................................................................42
PCB 104E - KEYPAD / DISPLAY BOARD, 1/3.....................................................................43
PCB 104E - KEYPAD / DISPLAY BOARD, 2/3.....................................................................44
PCB 104E - KEYPAD / DISPLAY BOARD, 3/3.....................................................................45
MAIN WIRING - POSITIVE (-P) NITS.................................................................................46
MAIN WIRING - D AL-POLARITY (-PN) NITS..................................................................47
PERFORMANCE CHECK SHEET.................................................................................48
Manual Reference: /fileserver/officefiles/instructword/avoz/AVOZ-D2-B,ed4.odt.
Last modified November 1, 2011.
Copyright © 2011 Avtech Electrosystems Ltd, All Rights Reserved.
4

INTRODUCTION
The AVOZ-D2-B is a high performance, GPIB and RS232-equipped pulser generator
that features five identical outputs. These outputs can either be combined to drive a
single low-impedance (10 Ohm) load, or can be used separately to drive multiple 50
Ohm loads simultaneously. This unique flexibility makes the AVOZ-D2-B ideal for
testing high-current laser diode arrays, as well as testing multiple identical lower-current
devices (for instance, production testing of attenuators).
The AVOZ-D2-B is capable of generating 0 to 700V on each of its five identical outputs,
at repetition rates up to 2.5 kHz. The pulse width is variable from 200 ns to 10 us, and
the duty cycle may be as high as 0.05%. Rise and fall times are fixed at less than 100
ns. The AVOZ-D2-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. The output pulse width can be set to follow an input trigger pulse width.
The five outputs are all wired to the same point internally, and thus share common
timing and amplitude controls. If the five outputs are connected to a common 10 Ohm
load, the AVOZ-D2-B can deliver up to 70 Amps of pulsed current to the load.
An optional output module is available to simplify the connection of a single load to the
multiple outputs. Cable kits are also optionally available.
The output voltage polarity depends on the model number:
"-P" units: 0 to +700 Volts
"-N" units: 0 to -700 Volts
The AVOZ-D2-B features front panel keyboard and adjust knob control of the output
pulse parameters along with a four line by 40-character backlit 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
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.
The instrument is protected against overload conditions (such as short circuits) by an
automatic control circuit. An internal power supply monitor removes the power to the
output stage for five seconds if an average power overload exists. After that time, the
unit operates normally for one second, and if the overload condition persists, the power
is cut again. This cycle repeats until the overload is removed.
This instrument is intended for use in research, development, test and calibration
laboratories by qualified personnel.
5

AVAILABLE OPTIONS
-CK5 Option: Cable kit (five RG-58C/U cables, 5ft/152cm)
-OM5 Option: Output module, with five input connectors and one output connector.
-BR Option: This optional feature allows a burst of 1-500 pulses to be generated in
response to each trigger event.
-R5 Option: Rack-mount kit.
-TNT Option: Adds a rear-panel Ethernet connector, providing Telnet-based remote
control from a network.
6

SPECIFICATIONS
Model1: AVOZ-D2-B
Amplitude2:
voltage (each output):
current (sum of all outputs):
0 to 700V
0 to 70A
Minimum load impedance:
(parallel combination of loads on all
outputs)
10 Ω
(Must be non-inductive3.)
Maximum number of 50Ω loads (if
outputs used separately): 5
Pulse width: 200 ns - 10 us
Rise time (20%-80%): < 100 ns
Fall time (80%-20%): < 100 ns
Maximum PRF: 2.5 kHz
Duty cycle: (max) 0.05%
Output impedance: < 0.4 Ohms
Average output power: 25W maximum
Droop: < 5%, at maximum pulse width and maximum amplitude
Polarity4: Positive or negative or dual-polarity (specify)
GPIB & RS-232 control1: Standard on -B units.
See http://www.avtechpulse.com/gpib for details.
LabView drivers: Check http://www.avtechpulse.com/labview
for availability and downloads
Propagation delay: < 200 ns (Ext trig in to pulse out)
Jitter: ± 100 ps ± 0.03% of sync delay (Ext trig in to pulse out)
Trigger required: External trigger mode: + 5 Volts, 50 to 500 ns (TTL)
Sync delay: Variable, 0 to ±1.0 seconds (sync out to pulse out)
Sync output: + 3 Volts, 100 ns, will drive 50 Ohm loads
Gate input: Synchronous or asynchronous, active high or low, switchable.
Suppresses triggering when active.
Output connectors:
(see above for quantity)
Mainframe: Multiple SMA female connectors, for connection to an equal number of
separate 50 Ohm loads, or for connection to the output module.
Output module (if ordered): Multiple SMA female connectors for connection to
mainframe, and one Type-N female connector for connection to a low
impedance load.
Number of output connectors: 5
Optional cable kit:
(RG58C/U cables,
5 feet / 152 cm)
5 cables. Add -CK5 to model number.
Optional output module (for combining
multiple outputs on to a single Type-N
connector):
Add -OM5 to the model number.
Other connectors: Trig, Gate, Sync: BNC
Power, temperature: 100 - 240 Volts,
50 - 60 Hz.
Dimensions: Mainframe: 100 x 430 x 375 mm (3.9 x 17 x 14.8”),
-OM20 optional output modules: 43 mm x 66 mm x 107 mm (1.7” x 2.6” x 4.2”)
Chassis material: Anodized aluminum, with blue plastic trim
Temperature range: +5°C to +40°C
1) -B suffix indicates IEEE-488.2 GPIB and RS-232 control of pulse amplitude, pulse width, delay and PRF. (See http://www.avtechpulse.com/gpib).
2) For operation at voltage amplitudes of less than 10% of full-scale, better results may be obtained by setting the amplitude near full-scale and increasing the load
impedance accordingly. This will provide lower output currents.
3) For applications where additional resistance must be added in series with the device under test, Avtech recommends connecting multiple Ohmite (www.ohmite.com) OY-
series ceramic composition resistors in parallel to create a high-power, low-inductance effective resistance. These resistors can be purchased readily at http://www.digi-
key.com.
4) Indicate desired polarity by suffixing model number with -P or -N (i.e. positive or negative) or -PN for dual polarity option.
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 (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 3H4
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 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

AC POWER SUPPLY REGULATORY NOTES
This instrument converts the AC input power to the +24V DC voltage that powers the
internal circuitry of this instrument using a Tamura AAD130SD-60-A switching power
supply. According to the manufacturer, the Tamura AAD130SD-60-A has the following
certifications:
UL60950-1
IEC60950 -1
CSA C22.2 No. 60950- 1
EN60950 -1
and is compliant with:
EN61000-3-2
EN61000-4-2 Level 2
EN61000-4-2 Level 3 (Air Only)
EN61000-4-4 Level 3
EN61000-4-5 Level 3
EN61000-4-11
CISPR 11 and 22 FCC Part 15 Class B (conducted)
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 a power cord, a GPIB cable, and two instrumentation manuals
(this manual and the “Programming Manual for -B Instruments”) 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 - 240 V, 50 - 60 Hz.
The maximum power consumption is 90 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:
11

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 FROM 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.
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.
12

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.
LABVIEW DRIVERS
A LabVIEW driver for this instrument is available for download on the Avtech web site,
at http://www.avtechpulse.com/labview. A copy is also available in National Instruments'
Instrument Driver Library at http://www.natinst.com/.
13

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:
14
Fuses #1 and #2
(AC fuses)
Fuse #4
(DC fuse)
Fuse #3
(DC fuse)
Fuse
Drawer
Pry out the fuse
drawer using a
screwdriver.

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)
115 V 0.8A, 250V,
Time-Delay 5×20 mm 0218.800HXP F2418-ND
230 V 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 2.5A, 250V,
Time-Delay 5×20 mm 021802.5HXP F2427-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

FRONT PANEL CONTROLS
1. POWER Switch . This is the main power switch. When turning the instrument on,
there may be a delay of several seconds before the instrument appears to respond.
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 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. 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
output by a duration set by the "DELAY" controls and has an approximate amplitude
of +3 Volts to RL > 1kΩ with a pulse width of approximately 100 ns.
4. 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.
16
23
45
1

5. 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.
×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 FINE 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 FINE" button.
When the main menu is displayed, this knob can be used to
move the arrow pointer.
17

REAR PANEL CONTROLS
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 FUSE DRAWER . 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.
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.)
When triggering externally, the instrument can be set such that the output pulse
width tracks the pulse width on this input, or the output pulse width can be set
independently.
GATE
TRIG
AMP RS-232
GPIB
LAN
GRN=LNK
YEL=ACT
OUT
18
2
3
6
1
45 8
97
10

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. See the
“Programming Manual for -B Instruments” for more details on RS-232 control.
8. LAN Connector and Indicator . (Optional feature. Present on -TNT units only.) The
-TNT option "Internet-enables" Avtech pulse generators by adding this standard
Ethernet port to the rear panel, in addition to the IEEE-488.2 GPIB and RS-232 ports
normally found on "-B" units. Commands are sent using the standard Telnet protocol.
The SCPI-compliant command set is the same as that used for GPIB and RS-232
control. The -TNT option uses the Dynamic Host Configuration Protocol (DHCP) to
obtain its network address. A DHCP server must be present on the local network for
the -TNT option to operate properly.
9. AMP Connector . (Optional feature. Present on "-EA" units only.) The output amplitude
can be set to track the voltage on this input. Zero Volts in corresponds to zero
amplitude output, and +10V in corresponds to maximum amplitude within the selected
range. This mode is activated by selecting "Ext Control" on the front-panel amplitude
menu, or with the "source:voltage external" command.
10.OUT CONNECTORS . These five SMA connectors provide the main output signals.
For best results, each output should be terminated with a 50Ω load (or, equivalently, all
five outputs may be connected to a common 10Ω load). These five connectors are all
wired to the same point internally.
-PN units will have two sets of output connectors - one set for each polarity (for a total
of ten SMA connectors). Only one set of outputs is active at a time.
Caution: Voltages as high as ±700V may be present on the center conductor of
these output connectors. Avoid touching this conductor. Connect to these connectors
using standard coaxial cables, to ensure that the center conductor is not exposed.
19

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. The SYNC pulse is a fixed-width TTL-level reference pulse used to trigger
oscilloscopes or other measurement systems. When the delay is set to a positive value
the SYNC pulse precedes the OUT pulse. When the delay is set to a negative value the
SYNC pulse follows the OUT pulse.
These pulses are illustrated below, assuming internal triggering and a positive delay:
Figure A
If the delay is negative, the order of the SYNC and OUT pulses is reversed:
Figure
The next figure illustrates the relationship between the signal when an external TTL-
level trigger is used:
20
SYNC OUT
(generated by the
internal oscillator)
100 ns, FIXED
MAIN OUTPUT
PULSE WIDTH
DELAY < 0
AMPLITUDE,
VARIABLE
3V, FIXED
SYNC OUT
(generated by the
internal oscillator)
100 ns, FIXED
MAIN OUTPUT
PULSE WIDTHDELAY > 0
AMPLITUDE,
VARIABLE
3V, FIXED