Avtech AVRF-7A-B User manual

INSTRUCTIONS
MODEL AVRF-7A-B
0 TO 750 V, 5 ns RISE TIME
ULTRA-FAST PULSE GENERATOR
WITH IEEE 488. AND RS- 3 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 65
OGDENSBURG, NY
U.S.A. 13669-0 65
TEL: [phone] (USA & Canada) or [phone] (Intl)
FAX: [phone] (USA & Canada) or [phone] (Intl)
[e-mail] - http://www.avtechpulse.com/
X
BOX 51 0, LCD MERIVALE
OTTAWA, ONTARIO
CANADA K C 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: [e-mail]
World Wide Web: http://www.avtechpulse.com

TABLE OF CONTENTS
WARRANTY......................................................................................................................2
TECHNICAL SUPPORT...................................................................................................2
TABLE OF CONTENTS....................................................................................................3
INTRODUCTION...............................................................................................................5
HIGH-VOLTAGE PRECAUTIONS....................................................................................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 INFOR ATION............................................................................................20
BASIC P LSE CONTROL....................................................................................................20
TRIGGER MODES................................................................................................................22
P LSE WIDTH MODES........................................................................................................22
GATING MODES...................................................................................................................22
AMPLIT DE CONTROL........................................................................................................23
LOAD IMPEDANCE...............................................................................................................23
PREVENTING O TP T STAGE FAIL RE...........................................................................23
3

ALARMS................................................................................................................................ 24
OPERATIONAL CHECK.................................................................................................25
PROGRA ING YOUR PULSE GENERATOR...........................................................28
KEY PROGRAMMING COMMANDS....................................................................................28
ALL PROGRAMMING COMMANDS.....................................................................................29
ECHANICAL INFOR ATION......................................................................................31
TOP COVER REMOVAL.......................................................................................................31
RACK MO NTING................................................................................................................ 31
ELECTROMAGNETIC INTERFERENCE..............................................................................31
AINTENANCE..............................................................................................................32
REG LAR MAINTENANCE..................................................................................................32
CLEANING............................................................................................................................ 32
WIRING DIAGRA S.......................................................................................................33
WIRING OF AC POWER.......................................................................................................33
WIRING OF DC POWER.......................................................................................................34
PCB 158N - LOW VOLTAGE POWER S PPLY, 1/3............................................................35
PCB 158N - LOW VOLTAGE POWER S PPLY, 2/3............................................................36
PCB 158N - LOW VOLTAGE POWER S PPLY, 3/3............................................................37
PCB 94G - ALARM BOARD..................................................................................................38
PCB 157C - HIGH-VOLTAGE POWER S PPLY..................................................................39
PCB 168B - HIGH VOLTAGE DC POWER S PPLY............................................................40
PCB 183A-S AND 183A-P CAPACITOR BANKS.................................................................41
PCB 104E - KEYPAD / DISPLAY BOARD, 1/3.....................................................................42
PCB 104E - KEYPAD / DISPLAY BOARD, 2/3.....................................................................43
PCB 104E - KEYPAD / DISPLAY BOARD, 3/3.....................................................................44
MAIN WIRING (-P AND -PN NITS).....................................................................................45
MAIN WIRING (-N NITS).....................................................................................................46
PERFOR ANCE CHECK SHEET.................................................................................47
Manual Reference: /fileserver /officefiles/instructword/avrf/AVRF-7A-B,ed .odt.
Last modified October 19, 01 .
Copyright © 01 Avtech Electrosystems Ltd, All Rights Reserved.
4

INTRODUCTION
The AVRF-7A-B is a high performance, GPIB and RS 3 -equipped instrument capable
of generating 0 to 750V at repetition rates up to 5 kHz into loads of 50Ω.
For positive amplitudes, the pulse width is variable from 150 ns to 10 us, and the rise
and fall times ( 0% - 80%) are 5 ns or less.
Units with the -N or -PN options can generate negative output amplitudes. For negative
amplitudes, the pulse width is variable from 150 ns to 5 us, and the rise and fall times
( 0% - 80%) are 8 ns or less.
The duty cycle may be as high as 0.1%.
A 50 Ohm load impedance is required. Open circuits, short circuits, and other non-
50Ω loads may damage the instrument.
The AVRF-7A-B includes an internal trigger source, but it can also be triggered or gated
by an external source. The output pulse width can be set to follow an input trigger pulse
width. A front-panel pushbutton can also be used to trigger the instrument.
The AVRF-7A-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 some overload conditions 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

HIGH-VOLTAGE PRECAUTIONS
CA TION: This instrument provides output voltages as high as 750 Volts under
normal operating conditions, and generates up to 900V internally, 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 precautions should always be observed:
1. Keep exposed high-voltage wiring to an absolute minimum.
. 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.
Do not attempt any repairs on the instrument, beyond the fuse replacement procedures
described in this manual. Contact Avtech technical support (see page for contact
information) if the instrument requires servicing.
6

SPECIFICATIONS
Model: AVRF-7A-B1
Amplitude : 0 to 750 Volts (50 Ohm load required)
Rise & fall times ( 0%-80%): ≤ 5 ns for positive outputs,
≤ 8 ns for negative outputs
Pulse width (FWHM): 0.15 to 10 us for positive outputs,
0.15 to 5 us for negative outputs
PRF: 0 to 5 kHz
Duty cycle (max): 0.1%
Average power out (max): 11 Watts
Polarity: Positive (-P option), negative (-N option), or both (-PN option)
Propagation delay: ≤ 150 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)
Mode A: + 5 Volts, 50 ns or wider (TTL)
Mode B: + 5 Volts, PWIN = PWOUT (TTL)
Sync delay: Variable, 0 to ± 1 second
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.
Connectors: Out: BNC3
Trig, Sync, Gate: BNC
GPIB and RS- 3 control1: Standard on -B units.
Telnet / Ethernet control: Optional (-TNT option).
See http://www.avtechpulse.com/options/tnt for details.
Power requirements: 100 - 40 Volts, 50 - 60 Hz
Dimensions: (H x W x D) 100 mm x 430 mm x 475 mm (3.9” x 17” x 18.8”)
Rack-mount kit: Optional. Add -R5 to the model number.
Temperature range: +5°C to +40°C
1) -B suffix indicates IEEE-488. GPIB and RS- 3 control of amplitude, pulse width, PRF and delay. (See http://www.avtechpulse.com/gpib).
) For operation at amplitudes of less than 0% of full-scale, best results will be obtained by setting the amplitude near full-scale and using external attenuators on the output.
3) Add the suffix -NC, -HN, -MHV, or -SHV to the model number to replace the standard BNC output connector with N, HN, MHV, or SHV connectors, respectively.
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 51 0, LCD Merivale
Ottawa, Ontario
Canada K C 3H4
declare that this pulse generator meets the intent of Directive 004/108/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 5008 -1 Immunity
8

and that this pulse generator meets the intent of the Low Voltage Directive 7 / 3/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: 001 Safety requirements for electrical equipment for
measurement, control, and laboratory use
DIRECTIVE 00 /95/EC (RoHS)
This instrument is exempt from Directive 00 /95/EC of the European Parliament and
of the Council of 7 January 003 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 00 /96/EC. The Directive 00 /95/EC only applies to
Directive 00 /96/EC categories 1-7 and 10, as stated in the "Article - Scope" section
of Directive 00 /95/EC.
DIRECTIVE 00 /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 00 /96/EC of the European Union and
local laws) on behalf of the customer, as provided for under Article 9 of Directive
00 /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 + 4V 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 C . No. 60950- 1
EN60950 -1
and is compliant with:
EN61000-3-
EN61000-4- Level
EN61000-4- Level 3 (Air Only)
EN61000-4-4 Level 3
EN61000-4-5 Level 3
EN61000-4-11
CISPR 11 and 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 - 40 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-3 0 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,
30V, 50 Hz -AC00 Qualtek 370001-E01
Australia, New Zealand AS 311 : 000,
30- 40V, 50 Hz -AC01 Qualtek 374003-A01
Continental Europe, Korea,
Indonesia, Russia
European CEE 7/7
“Schuko” 30V, 50 Hz -AC0 Qualtek 36400 -D01
North America, Taiwan NEMA 5-15,
1 0V, 60 Hz -AC03 Qualtek 31 007-01
Switzerland SEV 1011,
30V, 50 Hz -AC06 Qualtek 378001-E01
South Africa, India SABS 164-1,
0- 50V, 50 Hz -AC17 Volex 131H 10 C3
Japan JIS 8303,
100V, 50-60 Hz -AC18 Qualtek 39700 -01
Israel SI 3 ,
0V, 50 Hz -AC19 Qualtek 398001-01
China GB 100 -1,
0V, 50 Hz -AC Volex 137H 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.
. 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 for contact information) if the instrument requires servicing. Service is to
be performed solely by qualified service personnel.
1

ENVIRONMENTAL CONDITIONS
This instrument is intended for use under the following conditions:
1. indoor use;
. altitude up to 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, # (AC)
115 V 0.8A, 50V,
Time-Delay 5× 0 mm 0 18.800HXP F 418-ND
30 V 0.5A, 50V,
Time-Delay 5× 0 mm 0 18.500HXP F 416-ND
#3 (DC) N/A 3.15A, 50V,
Time-Delay 5× 0 mm 0 183.15HXP F 430-ND
#4 (DC) N/A .0A, 50V,
Time-Delay 5× 0 mm 0 1800 .HXP F 4 0-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.
. 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. OUT CONNECTOR . This BNC connector provides the output to a 50Ω load.
Caution: Voltages as high as 750V may 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 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.
5. 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
16
2
3
4
56
1

detail.
6. 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-3 0 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.
. 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
RS-232
GPIB
18
3
6
1
45
7

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- 3 Connector. A standard serial cable with a 5-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- 3 control.
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:
0
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