Avtech AV-112A-PS User manual

INSTRUCTIONS
MODEL AV-112A-PS
0 to ±200V, 300 kHz
VARIABLE-GAIN
LINEAR AMPLIFIER
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 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)
Fax [phone] (USA & Canada) or [phone] (International)
E-mail [email protected]
World Wide Web http //www.avtechpulse.com
2

TABLE OF CONTENTS
WARRANTY......................................................................................................................2
TECHNICAL SUPPORT...................................................................................................2
TABLE OF CONTENTS....................................................................................................3
INTRODUCTION...............................................................................................................5
HIGH-VOLTAGE PRECAUTIONS....................................................................................5
SPECIFICATIONS.............................................................................................................6
REGULATORY NOTES....................................................................................................7
FCC PART 18.......................................................................................................................... 7
EC DECLARATION OF CONFORMITY..................................................................................7
DIRECTIVE 2002/95/EC (RoHS).............................................................................................8
DIRECTIVE 2002/96/EC ( EEE)............................................................................................8
AC PO ER SUPPLY REGULATORY NOTES.......................................................................9
INSTALLATION..............................................................................................................10
VISUAL CHECK.................................................................................................................... 10
PO ER RATINGS................................................................................................................10
CONNECTION TO THE PO ER SUPPLY...........................................................................10
PROTECTION FROM ELECTRIC SHOCK............................................................................11
ENVIRONMENTAL CONDITIONS.........................................................................................12
FUSES.............................................................................................................................13
AC FUSE REPLACEMENT...................................................................................................13
DC FUSE REPLACEMENT...................................................................................................14
FUSE RATINGS.................................................................................................................... 14
FRONT PANEL CONTROLS..........................................................................................15
REAR PANEL CONTROLS............................................................................................17
GENERAL INFORMATION.............................................................................................1
BASIC CONTROL................................................................................................................. 18
CAPACITIVE LOADS............................................................................................................18
CABLE LENGTHS................................................................................................................. 19
CALIBRATION......................................................................................................................19
OPERATIONAL CHECK.................................................................................................20
MECHANICAL INFORMATION......................................................................................22
TOP COVER REMOVAL.......................................................................................................22
RACK MOUNTING................................................................................................................22
ELECTROMAGNETIC INTERFERENCE..............................................................................22
3

MAINTENANCE..............................................................................................................23
REGULAR MAINTENANCE..................................................................................................23
CLEANING............................................................................................................................23
WIRING DIAGRAMS.......................................................................................................24
IRING OF AC PO ER.......................................................................................................24
PCB 158N - LO VOLTAGE PO ER SUPPLY, 1/3............................................................25
PCB 158N - LO VOLTAGE PO ER SUPPLY, 2/3............................................................26
PCB 158N - LO VOLTAGE PO ER SUPPLY, 3/3............................................................27
PCB 168B - HIGH VOLTAGE DC PO ER SUPPLY............................................................28
MAIN SIGNAL IRING.........................................................................................................29
PERFORMANCE CHECK SHEET..................................................................................30
Manual Reference /fileserver2/officefiles/instructword/av-112/AV-112A-PS, edition 6.odt.
Last modified May 22, 2013.
Copyright © 2013 Avtech Electrosystems Ltd, All Rights Reserved.
4

INTRODUCTION
The Model AV-112A-PS variable-gain linear amplifier accepts input voltages in the
range of 0 to ±2V, and has a variable gain of < +1 to > +100. The maximum output
voltage is ±200V. The AV-112A-PS will drive load impedances of 5 kΩ or higher.
This instrument is intended for use in research, development, test and calibration
laboratories by qualified personnel.
HIGH-VOLTAGE PRECAUTIONS
CAUTION: This instrument provides output voltages as high as ±200 Volts, so
extreme caution must be employed when using this instrument. The instrument should
only be used by individuals who are thoroughly skilled in high voltage laboratory
techniques. The following precaution should always be observed
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 amplifier 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.
5

SPECIFICATIONS
Model AV-112A-PS
Output amplitude 0 to ±200 Volts
Maximum peak current 40 mA
Maximum average current 40 mA
Output polarity Bipolar
Load impedance ≥ 5 kΩ
Output resistance1≈ 50 Ω
Bandwidth (f-3dB) 300 kHz
Rise time (20%-80%, for
maximum output) 1 us
Average output power
(maximum) 8 W
Voltage gain2×1 to ×100
Gain polarity Standard Non-inverting (+)
Optional4 Switchable between Non-inverting (+) and Inverting (-) modes
Input range20 to ± 2 Volts
Input impedance 1 kΩ
Dual channel option Not available.
DC offset option30 to ±200 Volts
Connectors In, Out BNC
Dimensions 100 mm x 430 mm x 375 mm (3.9” x 17” x 14.8”)
Power requirement 100-240 Volts, 50-60 Hz
1) “Output resistance” is the internal resistance in series with output. Non-zero output impedances (ROUT) will reduce the maximum output amplitude
slightly when operating into low load impedances. That is, VOUT = VSET × RLOAD / (RLOAD + ROUT), where VSET is the set amplitude and RLOAD is the load
resistance.
2) These parameters can easily be adapted to meet special requirements. Contact Avtech ([email protected]) with your special application.
3) To specify the DC offset option, add the suffix -OS to the model number. The sum of the amplitude and the offset must remain within the rated
output amplitude range – i.e., this option does not change the minimum or maximum obtainable output voltage.
4) Add the suffix -INV to specify the switchable gain polarity featu
6

REGULATORY NOTES
FCC PART 18
This device complies with part 18 of the FCC rules for non-consumer industrial,
scientific and medical (ISM) equipment.
This instrument is enclosed in a rugged metal chassis and uses a filtered power entry
module (where applicable). The main output signal is provided on a shielded connector
that is intended to be used with shielded coaxial cabling and a shielded load. Under
these conditions, the interference potential of this instrument is low.
If interference is observed, check that appropriate well-shielded cabling is used on the
output connectors. Contact Avtech ([e-mail]) for advice if you are unsure
of the most appropriate cabling. Also, check that your load is adequately shielded. It
may be necessary to enclose the load in a metal enclosure.
If any of the connectors on the instrument are unused, they should be covered with
shielded metal “dust caps” to reduce the interference potential.
This instrument does not normally require regular maintenance to minimize interference
potential. However, if loose hardware or connectors are noted, they should be
tightened. Contact Avtech ([e-mail]) if you require assistance.
EC DECLARATION OF CONFORMITY
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
7

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.
8

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)
9

INSTALLATION
VISUAL CHECK
After unpacking the instrument, examine to ensure that it has not been damaged in
shipment. Visually inspect all connectors, knobs, and handles. Confirm that a power
cord is 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
10

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

ENVIRONMENTAL CONDITIONS
This instrument is intended for use under the following conditions
1. indoor use;
2. altitude up to 2 000 m;
3. temperature 5 °C to 40 °C;
4. maximum relative humidity 80 % for temperatures up to 31 °C decreasing linearly
to 50 % relative humidity at 40 °C;
5. Mains supply voltage fluctuations up to ±10 % of the nominal voltage;
6. no pollution or only dry, non-conductive pollution.
12

FUSES
This instrument contains four fuses. All are accessible from the rear-panel. Two protect
the AC prime power input, and two protect the internal DC power supplies. The
locations of the fuses on the rear panel are shown in the figure below
AC FUSE REPLACEMENT
To physically access the AC fuses, the power cord must be detached from the rear
panel of the instrument. The fuse drawer may then be extracted using a small flat-head
screwdriver, as shown below
13
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 0218.500HXP F2418-ND
230 V 0.5A, 250V,
Time-Delay 5×20 mm 0218.500HXP F2416-ND
#3
(DC) N/A 2.0A, 250V, Time-Delay 5×20 mm 0218002.HXP F2420-ND
#4
(DC) N/A 2.0A, 250V, Time-Delay 5×20 mm 0218002.HXP F2420-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.
14

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 is only likely to come on in two situations
•Briefly at startup. This is not a cause for concern.
•When the load impedance is too low (< 5 kΩ). In this case, turn off the instrument
and connect the proper load.
3. IN Connector . The input signal is applied to this connector. The input impedance is
approximately 1 kΩ. The input must not exceed ±2V.
4. GAIN Dial . This ten-turn dial is used to vary the amplifier gain between < +1 and >
+100. The gain dial is not calibrated. The output amplitude or gain should be verified
with an oscilloscope in applications where accuracy is an issue.
5. OUT Connector . This BNC connector provides the main output signal. The output is
an amplified version of the input on (3). The gain (VOUT/VIN) is controlled by (4).
Caution Voltages as high as ±200V may be present on the center conductor of
this output connector. Avoid touching this conductor. Connect to this connector using
15
1
25
4
36

standard coaxial cable, to ensure that the center conductor is not exposed.
6. OFFSET Controls . (Optional -OS option only.) This dial varies the DC offset on the
output from 0 to ±200V. The ON/OFF switch below the dial enables and disables this
function.
16

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.
17
2
31

GENERAL INFORMATION
BASIC CONTROL
The AV-112A-PS is a DC-300 kHz variable-gain linear amplifier. The gain is variable
from +1 to +100, and is adjusted by rotating the “GAIN” control.
The required voltage input signal is applied at the “IN” connector.
This mode is illustrated below
CAPACITIVE LOADS
The AV-112A-PS can drive resistive loads with impedances of 5 kilohms and higher. At
reduced frequencies, the AV-112A-PS can also drive a capacitive load of up to 6.8 nF.
The reduced maximum frequencies and increased rise times are outlined in the
following table
Maximum frequency
(for a given load resistance
and capacitance)
300 kHz (5 kΩ || 0 nF)
60 kHz (5 kΩ || 1 nF)
20 kHz (5 kΩ || 3 nF)
10 kHz (5 kΩ || 6.8 nF)
Square wave rise time
(20%-80%, for a given load
resistance and capacitance)
1 us (5 kΩ || 0 nF)
1.2 us (5 kΩ || 1 nF)
2.7 us (5 kΩ || 3 nF)
7 us (5 kΩ || 6.8 nF)
The || symbol means “in parallel with”.
18
ARBITRARY
WAVEFORM,
VIN, ± 2V MAXIMUM
INPUT VOLTAGE, ON
"IN" CONNECTOR
OUTPUT VOLTAGE, ON
"OUT" CONNECTOR
VOUT = VIN × GAIN,
GAIN = +1 TO +100,
ADJUSTABLE.
± 200V MAXIMUM.

CABLE LENGTHS
The length of cable used to connect the load to the output of the function generator
should be less than 3 feet (1 meter), and ideally less than 18 inches (0.5 meters). At
longer lengths, the transmission line reflections caused by the cabling will distort the
output signal, particularly if the signals with fast rise times are used.
CALIBRATION
The gain dial is not calibrated. The output amplitude or gain should be verified with an
oscilloscope in applications where accuracy is an issue.
19

OPERATIONAL CHECK
This section describes a sequence to confirm the basic operation of the instrument. It
should be performed after receiving the instrument. It is a useful learning exercise as
well.
asic Test Arrangement
1) Connect a 5 kΩ, 8W non-inductive test load between the OUT connector and
ground. A higher resistance may also be used, in which case the power rating may
be reduced. If cabling is used, keep it less than 3 feet / 1 meter in length. Confirm
that the oscilloscope and the test load are rated for 200 Volt operation.
2) Set the signal generator to produce a ±2V, 25 kHz waveform. (The input impedance
of the AV-112A-PS is 1 kΩ). Connect a cable from the SYNC connector of the
signal generator to the TRIG input of an oscilloscope. Set the oscilloscope to trigger
externally. Connect the main output of the signal generator to the input of the
amplifier.
3) Connect one oscilloscope probe (channel A) to the output of the signal generator.
Set the Channel A vertical scale to 1 V/div.
4) Connect one oscilloscope probe (channel B) to the 5 kΩ load. On the oscilloscope,
set the channel A vertical scale to 100 V/div, and the horizontal scale to 20 us/div.
20
AVTECH
AMPLIFIER
OUT
CONNECTOR
REAL-TIME
OSCILLOSCOPE
CHANNEL A
CHANNEL B
IN
CONNECTOR
SIGNAL
SOURCE
(±2V maximum)
TRIG
MAIN OUTPUT
SYNC OUTPUT
AC
POWER
SCOPE
PROBE
TEST LOAD,
5 kΩ, 8W
SCOPE
PROBE