Avtech AVR-G1-B User manual

INSTRUCTIONS
MODEL AVR-G1-B
250 Volt, 10 kHz, 100 ns to 1 s
PULSE GENERATOR
WITH IEEE 488.2 / RS-232 / ETHERNET CONTROL
SERIAL NUMBER: 14119
A V T E C H E L E C T R O S Y S T E M S L T D .
N A N O S E C O N D W A V E F O R M E L E C T R O N I C S
S I N C E 1 9 7 5
[e-mail]
http://www.avtechpulse.co /
Tel: [phone] (USA & Canada) or [phone] (Intl)
Fax: [phone] (USA & Canada) or [phone] (Intl)
BOX 5120, LCD MERIVALE
OTTAWA, CANADA K2C3H5

WARRANTY
Avtech Electrosyste s Ltd. warrants products of its anufacture to be free
fro defects in aterial and work anship under conditions of nor al 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 ite . This warranty does not apply to
units which have been disse bled, odified or subjected to conditions
exceeding the applicable specifications or ratings. This warranty is the extent of
the obligation assu ed by Avtech with respect to this product and no other
warranty or guarantee is either expressed or i plied.
TECHNICAL SUPPORT
Phone: [phone] (USA & Canada) or [phone] (International)
Fax: [phone] (USA & Canada) or [phone] (International)
E- ail: [e-mail]
World Wide Web: http://www.avtechpulse.co
2

TABLE OF CONTENTS
WARRANTY......................................................................................................................2
TECHNICAL SUPPORT...................................................................................................2
TABLE OF CONTENTS....................................................................................................3
INTRODUCTION...............................................................................................................5
-ADA SPECIAL OPTION.........................................................................................................5
AVAILABLE OPTIONS.....................................................................................................6
HIGH-VOLTAGE PRECAUTIONS....................................................................................7
SPECIFICATIONS............................................................................................................8
REGULATORY NOTES....................................................................................................9
FCC PART 18.......................................................................................................................... 9
EC DECLARATION OF CONFORMITY..................................................................................9
DIRECTIVE 2011/65/EU (RoHS ...........................................................................................10
DIRECTIVE 2002/96/EC (WEEE ..........................................................................................10
FIRMWARE LICENSING.......................................................................................................11
INSTALLATION..............................................................................................................12
VISUAL CHECK.................................................................................................................... 12
POWER RATINGS................................................................................................................12
CONNECTION TO THE POWER SUPPLY...........................................................................12
PROTECTION FROM ELECTRIC SHOCK...........................................................................13
ENVIRONMENTAL CONDITIONS........................................................................................14
LABVIEW DRIVERS..............................................................................................................14
FUSES.............................................................................................................................15
AC FUSE REPLACEMENT...................................................................................................15
DC FUSE REPLACEMENT...................................................................................................16
FUSE RATINGS.................................................................................................................... 16
FRONT PANEL CONTROLS..........................................................................................17
REAR PANEL CONTROLS............................................................................................19
GENERAL INFOR ATION............................................................................................21
BASIC PULSE CONTROL....................................................................................................21
DC OFFSET (-OT OPTION ..................................................................................................23
TRIGGER MODES................................................................................................................23
PULSE WIDTH MODES........................................................................................................24
GATING MODES...................................................................................................................24
3

OUTPUT IMPEDANCE..........................................................................................................24
LOAD IMPEDANCE..............................................................................................................25
BURST GENERATION (-BR OPTION .................................................................................25
PREVENTING OUTPUT STAGE FAILURE..........................................................................27
OPERATIONAL CHECK.................................................................................................28
PROGRA ING YOUR PULSE GENERATOR...........................................................31
KEY PROGRAMMING COMMANDS....................................................................................31
ALL PROGRAMMING COMMANDS.....................................................................................32
ECHANICAL INFOR ATION......................................................................................34
TOP COVER REMOVAL.......................................................................................................34
RACK MOUNTING................................................................................................................34
ELECTROMAGNETIC INTERFERENCE..............................................................................34
AINTENANCE..............................................................................................................35
REGULAR MAINTENANCE..................................................................................................35
CLEANING............................................................................................................................35
WIRING DIAGRA S.......................................................................................................36
WIRING OF AC POWER.......................................................................................................36
PCB 158R5 - LOW VOLTAGE POWER SUPPLY................................................................37
PCB 284C - HIGH VOLTAGE DC POWER SUPPLY............................................................38
PCB 183A-S AND 183A-P CAPACITOR BANKS.................................................................39
PCB 104G - KEYPAD / DISPLAY BOARD...........................................................................40
MAIN WIRING - POSITIVE POLARITY (-P UNITS..............................................................41
PERFOR ANCE CHECK SHEET.................................................................................42
Manual Reference: /fileserver2/officefiles/instructword/avr-g/AVR-G1-B,ed5.odt.
Last odified March 16, 2021.
Copyright © 2021 Avtech Electrosyste s Ltd, All Rights Reserved.
4

INTRODUCTION
The AVR-G1-B is a high perfor ance, GPIB and RS232-equipped instru ent capable
of generating up to 250V at repetition rates up to 10 kHz into high-i pedance loads of
10 kΩ or higher. The pulse width is variable fro 100 ns to 1 s, and the duty cycle
ay be as high as 80%. Rise and fall ti es are fixed at less than 20 ns. The AVR-G1-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 instru ent. The output
pulse width can be set to follow an input trigger pulse width.
The output voltage polarity depends on the odel nu ber:
"-P" units: up to +250 Volts
"-N" units: up to -250 Volts
"-PN" units: up to ±250 Volts
The AVR-G1-B features front panel keyboard and adjust knob control of the output
pulse para eters along with a four line by 40-character backlit LCD display of the
output a plitude, pulse width, pulse repetition frequency, and delay. The instru ent
includes e ory to store up to four co plete instru ent setups. The operator ay use
the front panel or the co puter interface to store a co plete “snapshot” of all key
instru ent settings, and recall this setup at a later ti e.
The instru ent is protected against overload conditions (such as short circuits) by an
auto atic control circuit. An internal power supply onitor re oves the power to the
output stage for five seconds if an average power overload exists. After that ti e, the
unit operates nor ally for one second, and if the overload condition persists, the power
is cut again. This cycle repeats until the overload is re oved.
This instru ent is intended for use in research, develop ent, test and calibration
laboratories by qualified personnel.
-ADA SPECIAL OPTION
Units with the -ADA special option have a ini u pulse width of 50 ns, rather than the
standard 100 ns.
5

AVAILABLE OPTIONS
-BR Option: This optional feature allows a burst of 1-500 pulses to be generated in
response to each trigger event.
-OT Option: Allows a DC offset (in the range of -50V to +50V) to be added to the
output. When generating a pulse with positive a plitude, the offset plus
a plitude ust re ain between 0 and +250V, and when generating a
pulse with negative a plitude, the offset plus a plitude ust re ain
between 0 and -250V.
-R5 Option: Rack- ount kit.
6

HIGH-VOLTAGE PRECAUTIONS
CAUTION: This instru ent provides output voltages as high as 250 Volts under
nor al operating conditions, and generates up to 260V internally, so extre e caution
ust be e ployed when using this instru ent. The instru ent should only be used by
individuals who are thoroughly skilled in high voltage laboratory techniques. The
following precautions should always be observed:
1. Keep exposed high-voltage wiring to an absolute ini u .
2. Wherever possible, use shielded connectors and cabling.
3. Connect and disconnect loads and cables only when the instru ent is turned off.
4. Keep in ind that all cables, connectors, oscilloscope probes, and loads ust
have an appropriate voltage rating.
Do not atte pt any repairs on the instru ent, beyond the fuse replace ent procedures
described in this anual. Contact Avtech technical support (see page 2 for contact
infor ation) if the instru ent requires servicing.
7

SPECIFICATIONS
Model: AVR-G1-B1
A plitude: 10 to 250 Volts
Basic wavefor : Nor al pulse
Pulse width (FWHM): 100 ns to 1 s2
Load i pedance: ≥ 10 kΩ
Output i pedance6: 50 Ω
Rise, fall ti es (20%-80%)7: ≤ 20 ns
PRF: 1 Hz - 10 kHz
Maxi u duty cycle: 80 %
Polarity3: Positive or negative or both (specify)
GPIB and RS-232 control1: Standard on -B units.
LabView Drivers: Check http://www.avtechpulse.co /labview for availability and downloads
Ethernet port, for re ote
control using VXI-11.3, ssh,
telnet, web:
Included. Reco ended as a odern alternative to GPIB / RS-232.
See http://www.avtechpulse.co /options/vxi for details.
Settings resolution: The resolution of the ti ing para eters (pulse width, delay, period) varies, but is always better than
0.15% of (|set value| + 20 ns). The a plitude resolution is < 0.1% of the axi u a plitude.
Settings accuracy: Typically ± 3% (plus ±1V or ± 2 ns) after 10 inute war up. For high-accuracy applications
requiring traceable calibration, verify the output para eters with a calibrated oscilloscope8.
Burst ode: Optional4. Generates 1-500 pulses per trigger event. See http://www.avtechpulse.co /options/br.
Propagation delay: ≤ 100 ns (Ext trig in to pulse out)
Jitter: ± 100 ps ± 0.03% of sync delay (Ext trig in to pulse out)
DC offset: Option available5
Trigger odes: Internal trigger, external trigger (TTL level pulse, > 10 ns, 1 kΩ input i pedance), front-panel
“Single Pulse” pushbutton, or single pulse trigger via co puter co and. In the external trigger
ode, the pulse width ay be set by the instru ent, or it ay be set to track the input pulse width.
Variable delay: Sync to ain out: 0 to 1.0 seconds, for all trigger odes (including external trigger).
Sync output: > +3 Volts, > 50 ns, will drive 50 Oh loads
Gate input: Synchronous or asynchronous, active high or low, switchable. Suppresses triggering when active.
Connectors: Out, Trig, Sync, Gate: BNC
Power require ents: 100 - 240 Volts, 50 - 60 Hz
Di ensions (H x W x D): 100 x 430 x 375 (3.9” x 17” x 14.8”)
Chassis aterial: Alu inu fra e and handles, gray vinyl on alu inu cover plates
Rack- ount kit: Optional. Add -R5 to the odel nu ber.
Te perature range: +5°C to +40°C
1) -B suffix indicates IEEE-488.2 GPIB and RS-232 control of a plitude, pulse width or duty cycle (as appropriate), pulse repetition frequency, and
delay (See http://www.avtechpulse.co /gpib).
2) When triggered externally, the pulse width can be set by the pulse instru ent controls, or it ay be set to track the input trigger pulse width.
3) Indicate desired polarity by suffixing odel nu ber with -P or -N (i.e. positive or negative) or -PN for dual polarity option.
4) Add the suffix -BR to the odel nu ber to specify the burst ode option. See http://www.avtechpulse.co /options/br for details about this option. Not
available on the AVR-G5-B odel.
5) To generate a 0 to ±50V offset internally, add the suffix -OT to the odel nu ber. When generating a pulse with positive a plitude, the offset plus
a plitude ust re ain between 0 and +250V, and when generating a pulse with negative a plitude, the offset plus a plitude ust re ain between
0 and -250V.
6) This is the resistance in series with the output, internally. The 50 Oh series resistance provides trans ission line back- atching to absorb
reflections fro the load. This is not the sa e as the load i pedance. The AVR-G series can not drive 50 Oh loads.
7) For a non-capacitive load. The 50 Oh output i pedance will cause rise and fall ti e degradation if the load has capacitance, governed by the RC
ti e constant.
8) These instru ents are provided with a basic calibration checksheet, showing a selection of easured output para eters. These easure ents are
perfor ed with equip ent that is calibrated on a regular basis by a third-party ISO/IEC 17025:2005 accredited calibration laboratory. However,
Avtech itself does not clai any accreditation. For applications requiring traceable perfor ance, use a calibrated easure ent syste rather than
relying on the accuracy of the pulse generator settings.
8

REGULATORY NOTES
FCC PART 18
This device co plies with part 18 of the FCC rules for non-consu er industrial,
scientific and edical (ISM) equip ent.
This instru ent is enclosed in a rugged etal chassis and uses a filtered power entry
odule (where applicable). The ain 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 instru ent 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 ost appropriate cabling. Also, check that your load is adequately shielded. It
ay be necessary to enclose the load in a etal enclosure.
If any of the connectors on the instru ent are unused, they should be covered with
shielded etal “dust caps” to reduce the interference potential.
This instru ent does not nor ally require regular aintenance to ini ize interference
potential. However, if loose hardware or connectors are noted, they should be
tightened. Contact Avtech ([email protected] ) if you require assistance.
EC DECLARATION OF CONFORMITY
We Avtech Electrosyste s Ltd.
P.O. Box 5120, LCD Merivale
Ottawa, Ontario
Canada K2C 3H5
declare that this pulse generator eets the intent of Directive 2004/108/EG for
Electro agnetic Co patibility. Co pliance pertains to the following specifications as
listed in the official Journal of the European Co unities:
EN 50081-1 E ission
EN 50082-1 I unity
9

and that this pulse generator eets the intent of the Low Voltage Directive 2006/95/EC.
Co pliance pertains to the following specifications as listed in the official Journal of the
European Co unities:
EN 61010-1:2001 Safety require ents for electrical equip ent for
easure ent, control, and laboratory use
DIRECTIVE 2011/65/EU (RoHS)
We Avtech Electrosyste s Ltd.
P.O. Box 5120, LCD Merivale
Ottawa, Ontario
Canada K2C 3H5
declare that, to the best of our knowledge, all electrical and electronic equip ent (EEE)
sold by the co pany are in co pliance with Directive 2011/65/EU of the European
Parlia ent and of the Council of 8 June 2011 on the restriction of the use of certain
hazardous substances in electrical and electronic equip ent (also known as “RoHS
Recast”). In addition, this declaration of confor ity is issued under the sole
responsibility of Avtech Electrosyste s Ltd. Specifically, products anufactured do not
contain the substances listed in the table below in concentrations greater than the listed
axi u value.
Material/Substance Threshold level
Lead (Pb) < 1000 pp (0.1% by ass)
Mercury (Hg) < 1000 pp (0.1% by ass)
Hexavalent Chro iu (Cr6+) < 1000 pp (0.1% by ass)
Polybro inated Biphenyls (PBB) < 1000 pp (0.1% by ass)
Polybro inated Diphenyl ethers (PBDE) < 1000 pp (0.1% by ass)
Cad iu (Cd) < 100 pp (0.01% by ass)
Bis(2-ethylhexyl) phthalate (DEHP) < 1000 pp (0.1% by ass)
Butyl benzyl phthalate (BBP) < 1000 pp (0.1% by ass)
Dibutyl phthalate (DBP) < 1000 pp (0.1% by ass)
Diisobutyl phthalate (DIBP) < 1000 pp (0.1% by ass)
DIRECTIVE 2002/96/EC (WEEE)
European custo ers who have purchased this equip ent directly fro Avtech will have
co pleted a “WEEE Responsibility Agree ent” for , accepting responsibility for WEEE
co pliance (as andated in Directive 2002/96/EC of the European Union and local
10

laws) on behalf of the custo er, as provided for under Article 9 of Directive
2002/96/EC.
Custo ers who have purchased Avtech equip ent through local representatives
should consult with the representative to deter ine who has responsibility for WEEE
co pliance. Nor ally, such responsibilities with lie with the representative, unless other
arrange ents (under Article 9) have been ade.
Require ents for WEEE co pliance ay include registration of products with local
govern ents, reporting of recycling activities to local govern ents, and financing of
recycling activities.
FIRMWARE LICENSING
Instru ents with fir ware versions 5.00 or higher use open-source software internally.
So e of this software requires that the source code be ade available to the user as a
condition of its licensing. This source code is available upon request (contact
[email protected]o ).
Earlier fir ware versions do not contain any open source software.
11

INSTALLATION
VISUAL CHECK
After unpacking the instru ent, exa ine to ensure that it has not been da aged in
ship ent. Visually inspect all connectors, knobs, liquid crystal displays (LCDs), and the
handles. Confir that a power cord, a GPIB cable, and two instru entation anuals
(this anual and the “Progra ing Manual for -B Instru ents”) are with the instru ent.
If the instru ent has been da aged, file a clai i ediately with the co pany that
transported the instru ent.
POWER RATINGS
This instru ent is intended to operate fro 100 - 240 V, 50 - 60 Hz.
The axi u power consu ption is 57 Watts. Please see the “FUSES” section for
infor ation about the appropriate AC and DC fuses.
This instru ent is an “Installation Category II” instru ent, intended for operation fro a
nor al single-phase supply.
CONNECTION TO THE POWER SUPPLY
An IEC-320 three-pronged recessed ale socket is provided on the back panel for AC
power connection to the instru ent. One end of the detachable power cord that is
supplied with the instru ent plugs into this socket. The other end of the detachable
power cord plugs into the local ains supply. Use only the cable supplied with the
instru ent. The ains supply ust be earthed, and the cord used to connect the
instru ent to the ains supply ust provide an earth connection. (The supplied cord
does this.)
Warning: Failure to use a grounded outlet ay result in injury or death due to
electric shock. This product uses a power cord with a ground connection. It ust be
connected to a properly grounded outlet. The instru ent chassis is connected to the
ground wire in the power cord.
The table below describes the power cord that is nor ally supplied with this instru ent,
depending on the destination region:
12

Destination Region Description Option Manufacturer Part Nu ber
United Kingdo , 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 A erica, 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 SHOCK
Operators of this instru ent ust be protected fro electric shock at all ti es. The
owner ust ensure that operators are prevented access and/or are insulated fro
every connection point. In so e cases, connections ust be exposed to potential
hu an contact. Operators ust be trained to protect the selves fro the risk of electric
shock. This instru ent is intended for use by qualified personnel who recognize shock
hazards and are fa iliar with safety precautions required to avoid possibly injury. In
particular, operators should:
1. Keep exposed high-voltage wiring to an absolute ini u .
2. Wherever possible, use shielded connectors and cabling.
3. Connect and disconnect loads and cables only when the instru ent is turned off.
4. Keep in ind that all cables, connectors, oscilloscope probes, and loads ust
have an appropriate voltage rating.
5. Do not atte pt any repairs on the instru ent, beyond the fuse replace ent
procedures described in this anual. Contact Avtech technical support (see
page 2 for contact infor ation) if the instru ent requires servicing. Service is to
be perfor ed solely by qualified service personnel.
13

ENVIRONMENTAL CONDITIONS
This instru ent is intended for use under the following conditions:
1. indoor use;
2. altitude up to 2 000 ;
3. te perature 5 °C to 40 °C;
4. axi u relative hu idity 80 % for te peratures up to 31 °C decreasing
linearly to 50 % relative hu idity at 40 °C;
5. Mains supply voltage fluctuations up to ±10 % of the no inal voltage;
6. no pollution or only dry, non-conductive pollution.
LABVIEW DRIVERS
A LabVIEW driver for this instru ent is available for download on the Avtech web site,
at http://www.avtechpulse.co /labview. A copy is also available in National Instru ents'
Instru ent Driver Library at http://www.natinst.co /.
14

FUSES
This instru ent contains four fuses. All are accessible fro the rear-panel. Two protect
the AC pri e 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 ust be detached fro the rear
panel of the instru ent. The fuse drawer ay then be extracted using a s all flat-head
screwdriver, as shown below:
Fuse
Drawer
Pry out the fuse
drawer using a
screwdriver.
15
Fuses #1 and #2
AC fuses)
Fuse #4
DC fuse)
Fuse #3
DC fuse)

DC FUSE REPLACEMENT
The DC fuses ay 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
No inal
Mains
Voltage
Rating Case Size
Reco ended Replace ent Part
Littelfuse Part
Nu ber
Digi-Key Stock
Nu ber
#1, #2 (AC) 100-240V 0.5A, 250V,
Ti e-Delay 5×20 0218.500HXP F2416-ND
#3 (DC) N/A 1A, 250V,
Ti e-Delay 5×20 0218001.HXP F2419-ND
#4 (DC) N/A 0.8A, 250V,
Ti e-Delay 5×20 0218.800HXP F2418-ND
The reco ended fuse anufacturer is Littelfuse (http://www.littelfuse.co ).
Replace ent fuses ay be easily obtained fro Digi-Key (http://www.digikey.co ) and
other distributors.
16

FRONT PANEL CONTROLS
1. POWER Switch . This is the ain power switch. When turning the instru ent on,
there ay be a delay of several seconds before the instru ent appears to respond.
2. OVERLOAD Indicator . When the instru ent is powered, this indicator is nor ally
green, indicating nor al operation. If this indicator is yellow, an internal auto atic
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 i pedance), the
protective circuit will disable the output of the instru ent and turn the indicator light
yellow. The light will stay yellow (i.e. output disabled) for about 5 seconds after
which the instru ent will atte pt 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 re oved, the
instru ent will resu e nor al operation.
This overload indicator ay flash yellow briefly at start-up. This is not a cause for
concern.
3. OUT CONNECTOR . This BNC connector provides the output to a 10 kΩ (or higher)
load.
Caution: Voltages as high as ±250V ay be present on the center conductor of
this output connector. Avoid touching this conductor. Connect to this connector
using standard coaxial cable, to ensure that the center conductor is not exposed.
4. SYNC OUT . This connector supplies a SYNC output that can be used to trigger
other equip ent, particularly oscilloscopes. This signal leads (or lags) the ain
output by a duration set by the "DELAY" controls and has an approxi ate a plitude
of +3 Volts to RL > 1kΩ with a pulse width of approxi ately 100 ns.
5. LIQUID CRYSTAL DISPLAY (LCD) . This LCD is used in conjunction with the
keypad to change the instru ent settings. Nor ally, the ain enu is displayed,
which lists the key adjustable para eters and their current values. The
2
3
4
56
1
17

“Progra ing Manual for -B Instru ents” describes the enus and sub enus in
detail.
6. KEYPAD .
Control Na e Function
MOVE This oves the arrow pointer on the display.
CHANGE This is used to enter the sub enu, or to select the operating
ode, pointed to by the arrow pointer.
×10 If one of the adjustable nu eric para eters is displayed, this
increases the setting by a factor of ten.
÷10 If one of the adjustable nu eric para eters is displayed, this
decreases the setting by a factor of ten.
+/- If one of the adjustable nu eric para eters is displayed, and
this para eter can be both positive or negative, this changes the
sign of the para eter.
EXTRA FINE This changes the step size of the ADJUST knob. In the extra-
fine ode, the step size is twenty ti es finer than in the nor al
ode. This button switches between the two step sizes.
ADJUST This large knob adjusts the value of any displayed nu eric
adjustable values, such as frequency, pulse width, etc. The
adjust step size is set by the "EXTRA FINE" button.
When the ain enu is displayed, this knob can be used to
ove the arrow pointer.
18

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 ale socket is
provided on the back panel for AC power connection to the instru ent. One end of
the detachable power cord that is supplied with the instru ent 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 anual for ore infor ation.
3. DC FUSES . These two fuses protect the internal DC power supplies. Please see the
“FUSES” sections of this anual for ore infor ation.
4. GATE . This TTL-level (0 and +5V) logic input can be used to gate the triggering of
the instru ent. This input can be either active high or active low, depending on the
front panel settings or progra ing co ands. (The instru ent triggers nor ally
when this input is unconnected). When set to active high ode, this input is pulled-
down to ground by a 1 kΩ resistor. When set to active low ode, 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 instru ent, if
the instru ent is set to triggering externally. The instru ent triggers on the rising
edge of this input. The input i pedance of this input is 1 kΩ. (Depending on the
length of cable attached to this input, and the source driving it, it ay be desirable to
add a coaxial 50 Oh ter inator to this input to provide a proper trans ission line
ter ination. The Pasternack (www.pasternack.co ) PE6008-50 BNC feed-thru 50
Oh ter inator is suggested for this purpose.)
8
19
6
3
51
4
2
7
GATE
RS-232
GPIB
TRIG

When triggering externally, the instru ent 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.
6. GPIB Connector . A standard GPIB cable can be attached to this connector to allow
the instru ent to be co puter-controlled. See the “Progra ing Manual for -B
Instru ents” for ore details on GPIB control.
7. RS-232 Connector. A standard serial cable with a 25-pin ale connector can be
attached to this connector to allow the instru ent to be co puter-controlled. A user
na e (“ad in”) and a password (“default”, as shipped fro the factory) are required
when logging into a serial ter inal session. The internal controller atte pts to auto-
sense the parity setting. It ay be necessary to send a few return characters before
atte pting a login in order to provide enough data to allow this auto-sensing to work.
(A standard Linux “agetty” process is used to i ple ent serial control internally.) See
the “Progra ing Manual for -B Instru ents” for ore details on RS-232 control.
8. Network Connector . This Ethernet connector allows the instru ent to be re otely
controlled using the VXI-11.3, ssh (secure shell), telnet, and http (web) protocols. See
the “Progra ing Manual for -B Instru ents” for ore details.
20