Megaimpulse NPG18P14 User manual

FOUR-CHANNEL
NANOSECOND PULSE GENERATOR
NPG18P14 (positive output pulse pola ity)
AND
NPG18N14 (negative output pulse pola ity)
USER MANUAL
v. 0.1
© 2021 Megaimpulse Ltd.

Copyright © 2021 MEGAIMPULSE Ltd. All Rights Reserved.
MEGAIMPULSE LTD. PROVIDES THIS MANUAL "AS IS" WITHOUT WARRANTY OF ANY KIND,
EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OR
CONDITIONS OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
SHALL MEGAIMPULSE LTD., ITS DIRECTORS, OFFICERS, EMPLOYEES OR AGENTS BE LIABLE FOR
ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES (INCLUDING DAMAGES
FOR LOSS OF PROFITS, LOSS OF BUSINESS, LOSS OF USE OR DATA, INTERRUPTION OF BUSINESS
AND THE LIKE), EVEN IF MEGAIMPULSE LTD. HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
DAMAGES ARISING FROM ANY DEFECT OR ERROR IN THIS MANUAL OR PRODUCT.
SPECIFICATIONS AND INFORMATION CONTAINED IN THIS MANUAL ARE FURNISHED FOR
INFORMATION ONLY, AND ARE SUBJECT TO CHANGE AT ANY TIME WITHOUT NOTICE, AND
SHOULD NOT BE CONSTRUED AS A COMMITMENT BY MEGAIMPULSE LTD. MEGAIMPULSE LTD.
ASSUMES NO RESPONSIBILITY OR LIABILITY FOR ANY ERRORS OR INACCURACIES THAT MAY
APPEAR IN THIS MANUAL, INCLUDING THE PRODUCTS AND SOFTWARE DESCRIBED IN IT.
P oducts and co po ate names appea ing in this manual may o may not be egiste ed t adema ks o copy ights of
thei espective companies, and a e used only fo identification o explanation and to the owne s' benefit, without
intent to inf inge.
Megai pulse Ltd. contact infor ation
Mail add ess: 26 Polytechnicheskaya st ., St. Pete sbu g, 194021 Russia
www: http://www.megaimpulse.com
e-mail: mp@powe .ioffe. ssi. u
fax: [phone]

CONTENTS
Package content ........................................................................................... 2
Gene al view of the nanosecond pulse gene ato ........................................... 2
Safety manual .............................................................................................. 3
Technical specification ................................................................................. 4
Ope ation p inciples ..................................................................................... 5
F ont panel ................................................................................................... 9
F ont panel in detail ...................................................................................... 10
Putting the gene ato into ope ation .............................................................. 12
Exte nal t igge ing ....................................................................................... 14
Elect onic fuse ............................................................................................. 17
Wa anty ...................................................................................................... 17
Appendix A.
List of p eset f equencies and numbe of pulses within a bu st ................ 18
Use manual of NPG18P14 (NPG18N14) 1

PACKAGE CONTENT
Please check the package fo the following items:
 NPG18P14 (NPG18N14) fou -channel nanosecond pulse gene ato
(he einafte "gene ato ")
 Powe supply cable
 High voltage output coaxial cables, 4 pcs.
 Use manual (elect onic o p inted ve sion)
Fig.1. Gene al view of NPG18P14 (positive output pulse pola ity) o NPG18N14
(negative output pulse pola ity) nanosecond pulse gene ato .
MEGAIMPULSE LTD. 2

SAFETY MANUAL
Electrical safety
 NPG18P14 (NPG18N14) pulse gene ato is high voltage equipment. Please
be ve y ca eful and ope ate by qualified pe sonnel only.
 The e is a isk of elect ic shock, st ong elect omagnetic inte fe ence,
damage to the gene ato o othe elect onic equipment in case of imp ope
use.
 Do not switch on the gene ato without p ope g ounding. A th ee-te minal
powe supply outlet with g ound contact should be used.
 It is st ongly p ohibited to switch on the gene ato without the output
coaxial cables connected to all fou HV outputs on the ea panel. The
elect ical a cing on the open coaxial connecto may damage the gene ato .
Please use ou special high voltage coaxial connecto and cable only.
Standa d N-, HN- o 7/3-types connecto s a e not suitable. High voltage
connecto s should be clean and d y, f ee f om dust and di t. The mating
Teflon pa ts should be lub icated by silicone g ease.
 When adding o emoving the gene ato to o f om the system, ensu e that
the main powe supply ON/OFF switch is tu ned off and/o powe supply
cable is unplugged befo e the output HV cables a e connected o
disconnected.
 Please connect o disconnect any equipment, toggle between inte nal and
exte nal t igge ing modes while the gene ato is in high voltage OFF state
by HV ON/HV OFF switch.
Operation safety
 Please ead this manual befo e installing and using the gene ato .
 Befo e using the p oduct, make su e that all cables a e applicable and not
damaged.
 Please keep metal pa ts like clips, sc ews, and staples away f om the
gene ato to avoid a sho t ci cuit.
 The gene ato is designed to wo k in no mal labo ato y conditions. Please
avoid dust, humidity, and tempe atu e ext emes. Do not place the gene ato
in any place whe e it may become wet.
 Place the gene ato on a stable su face.
 If you encounte any technical p oblem with the gene ato , please contact
Megaimpulse Ltd. Do not epai the gene ato by you self.
Use manual of NPG18P14 (NPG18N14) 3

TECHNICAL SPECIFICATION
Output pulse amplitude
(typical)
s ooth regulated within 13.0 kV ... 18.0 kV
(50 steps) on atched 75 Oh load;
up to 36kV on open cable and discharge
Numbe of channels 4
Type of the output
connecto s
special HV coaxial connectors with 75 Oh
i pedance
Type of the output cables 75 Oh i pedance coaxial cables,
outer dia eter 9.6
Pulse pola ity positive (NPG18P14), negative (NPG18N14)
Pulse ise time < 4 ns (fast part of the output pulse)
Pulse width (FWHM) 10 ns
Pulse ene gy regulated within 15 J ... 30 J (50 steps)
Peak pulse powe up to 4.5 MW
Ope ation modes continuous, burst, single pulse odes;
internal and external triggering
Continuous mode epetition
ates (each channel)
fro 1 Hz to 4 kHz (internal triggering)
fro single pulse to 4 kHz (external triggering)
Bu st mode epetition ates;
numbe of pulses in a bu st
(each channel)
up to 100 kHz; up to 400 pulses within a burst or
100 s interval ( ax 4000 pulses in a second)
Exte nal t igge ing BNC connectors, +2.4V ... +5V a plitude
Inte nal gene ato delay < 1 μs
Jitte RMS (typical) 1 ns
SYNC OUT BNC connector, TTL level
Powe supply AC 110-230V, 50-60 Hz
Size 460 х 360 х 140 3
Weight (without cables) 16 kg
MEGAIMPULSE LTD. 4

OPERATION PRINCIPLES
The nanosecond pulse gene ato is a powe ful and sma t device. Despite of
its compact size and a small numbe of cont ol elements, it implements a lot of
ope ation egimes and high output powe acco ding to the use demand. Please
ead this manual ca efully to be familia with the basic ope ation p inciples.
The gene ato p oduces high voltage unipola nanosecond pulses. The
typical output pulse wavefo ms on the matched impedance 75 Ohm load a e
p esented in Fig. 2 and Fig.3. The f ont panel cont ol elements a e shown in Fig.4
and emphasized in the text by bold red colo .
 The e is open and sho t load p otection as well as ove heating p otection.
Howeve , it is st ongly p ohibited to switch on the gene ato without output
cables attached to all output HV connecto s o use less than 3-mete length
output cables. Othe wise, it may lead to pe manent damage to the output
ci cuits o HV connecto s.
Fig.2. The oscillog am of typical output pulse wavefo m of NPG18P14 positive
pulse pola ity gene ato at 99% (maximum) ene gy level. Ze o voltage
level is shown by dashed line and ma ke . The scales a e 10ns/div and
5kV/div, the measu ed pulse amplitude is 18.3kV.
Use manual of NPG18P14 (NPG18N14) 5

Fig.3. The oscillog am of typical output pulse wavefo m of NPG18N14 negative
pulse pola ity gene ato at 99% (maximum) ene gy level. Ze o voltage
level is shown by dashed line and ma ke . The scales a e 10ns/div and
5kV/div, the measu ed pulse amplitude is -18.3kV.
The gene ato has fou channels that p oduce HV output pulses and can be
tu ned on and tu ned off independently by buttons 17. LED indicato s 18 show the
channels which a e cu ently active. The output pulse width, ise time, and
pola ity a e fixed. The adjustable pa amete s a e pulse ene gy (amplitude),
f equency, and the numbe of pulses in a bu st, which can be set by the f ont panel
knobs 10 and 6. The min/max anges and default values of these pa amete s a e
the following:
- FREQUENCY f om 1 Hz to 101 kHz, the default value is 10 kHz;
- Fo the inte nal t igge ing mode, NUMBER OF PULSES in a bu st f om
1 to 400 (in each channel), the default value is 100, the pe iod of the
bu sts is fixed to 100 ms (10 Hz);
- Fo the exte nal t igge ing mode, maximum NUMBER OF PULSES
within a one-second inte val f om 10 to 4000 (in each channel), the
default value is 1000;
- Output PULSE ENERGY f om 50% to 99%, the default value is 75%.
MEGAIMPULSE LTD. 6

These pa amete s a e common and define the ope ation egime fo all the
channels. The cu ently set values a e indicated by displays 3 and 7. 4-digit
display 3 is used to indicate the f equency o the numbe of pulses. Please push
knob 6 up to a click to toggle between them. Indicato s 4 and 5 show which
pa amete is displayed at the moment.
HV ON/HV OFF button 1 activates/deactivates the HV system and allows
the gene ation of HV pulses in the active channels. Red LED on the button lights
on if the HV system is active. The gene ato can ope ate in a single pulse,
continuous, and bu st ope ation modes and has both inte nal and exte nal
t igge ing. Button 14 toggles the inte nal and exte nal t igge ing modes. The
cu ently chosen mode is shown by indicato s 13 o 15.
 The default values afte powe ing the gene ato a e 10 kHz and 100 pulses
(fo the inte nal t igge ing mode). The efo e, if HV is activated by p essing
button 1 and the inte nal t igge ing mode with the default pa amete s is
chosen, then the following pulse sequence should be gene ated: 10 bu sts
pe second in each channel (100 ms bu sts pe iod), 100 pulses pe bu st,
100 µs inte val between the pulses in a bu st (10 kHz), the bu st length
equal to 10 ms (100 pulses with 100 µs inte val), and the channels a e
shifted in time by 25 ms one elative to anothe .
In the case of inte nal t igge ing, the cont ol system p ovides the qua tz
stabilized t igge ing pulses. The HV output pulses with set pa amete s a e
gene ated in all active channels just afte activating the HV system by HV ON/HV
OFF button 1. The complete list of the p eset f equencies and the p eset numbe of
pulses in a bu st a e shown in Appendix A. If the cu ently set f equency in Hz is
lowe than o equal to the set numbe of pulses in a second (displayed numbe of
pulses value multiplied by 10), then the gene ato ope ates in continuous mode.
Othe wise, it switches into bu st mode automatically. In othe wo ds, the
FREQUENCY pa amete sets the inte val between the pulses, while the
NUMBER OF PULSES sets the bu st length o the numbe of pulses within
100 ms pe iod.
In the exte nal t igge ing mode, the FREQUENCY and NUMBER OF
PULSES pa amete s wo k as the limits fo the exte nal t igge ing pulses. In this
way, the cont ol system p events ove loading and damage to the gene ato o load
in case of imp ope exte nal t igge ing. The FREQUENCY pa amete sets the
maximum allowable exte nal pulse f equency (minimum inte val between the
pulses), and NUMBER OF PULSES sets the maximum numbe of pulses within
each one-second inte val.
 The maximum numbe of pulses within 100 ms inte val is limited to 400,
which co esponds to 4000 pulses in a second in each channel. The efo e,
the maximum ope ation f equency in continuous mode is 4 kHz. Highe
epetition ates a e available in bu st mode only.
Use manual of NPG18P14 (NPG18N14) 7

The exte nal t igge ing pulses fo each channel should be applied to
BNC connecto s 16. It is possible to tu n on and tu n off each channel
independently by buttons 17. The indicato s 18 of the active and p ope ly
t igge ed channels blink with 2 Hz f equency and confi m the t igge ing.
Two exte nal t igge ing modes a e available: exte nal t igge ing and
exte nal bu st enable. If the exte nal t igge ing pulse is sho t, 1 µs fo example,
then each exte nal t igge ing pulse esults in a single HV output pulse in the
co esponding channel, of cou se, if the t igge ing is not blocked by the cont ol
system due to too high f equency o too many pulses in a second. If the
t igge ing pulse is long, then HV output pulses un continuously with the set
f equency until the t igge ing pulse level is high. Please see the Exte nal
t igge ing section of the Use Manual fo mo e details.
The SYNC OUT pulses go to the f ont panel BNC output 12
simultaneously with each pulse gene ated in each channel. The SYNC OUT
pulses can be used fo the synch onization of the exte nal equipment with the
gene ato as well as testing the pulse sequence.
Special TEST mode can be activated by p essing knob 10. The HV
output pulses a e blocked fo all channels in this mode, HV ON/HV OFF
button 1 is deactivated, and display 7 indicates 00 value, which means ze o
output powe . The efo e, it is possible to check the t igge ing of the gene ato
and output pulses sequence on the SYNC OUT connecto 12 without applying
HV pulses to the load. P ess knob 10 again fo etu ning to the no mal
ope ation egime.
MEGAIMPULSE LTD. 8

FRONT PANEL
1 2 3 4 5 6 7 8 9 10 11
12 13 14 15 16 17 18 19
Fig.4. F ont panel cont ol elements:
1 – High voltage ON/OFF push button with ON state LED indicato
2 – Ove heat LED indicato
3 – F equency and numbe of pulses in bu st 4-digit display
4 – F equency mode LED indicato
5 – Numbe of pulses in a bu st mode LED indicato
6 – F equency and numbe of pulses in bu st egulation knob with push button
7 – Output pulse ene gy 2-digit display
8 – Ene gy mode LED indicato
9 – Test mode LED indicato
10 – Output pulse ene gy egulation knob with push button
11 – Main powe supply ON/OFF toggle switch
12 – BNC type SYNC OUT connecto
13 – Inte nal synch onization mode LED indicato
14 –Inte nal/exte nal t igge ing push button
15 – Exte nal synch onization mode LED indicato
16 – BNC type SYNC IN connecto s (fou channels)
17 – Channels ON/OFF push buttons (yellow, blue, ed, g een)
18 – LED indicato s of the active channels
19 – Elect onic fuse
Fou HV output connecto s, main powe supply connecto , and the fans
inlets/outlets a e located on the ea panel.
Use manual of NPG18P14 (NPG18N14) 9

FRONT PANEL IN DETAIL
Non
-
latching push
button, which
toggles HV system
ON and OFF. Red LED on the button lights on when
the HV system is activated and eady fo t igge ing by
inte nal o exte nal t igge ing pulses. HV system is set
to OFF state when the gene ato is powe ed on and
automatically toggles to OFF state in case of
ove heating o TEST mode activation.
If the
ambient tempe atu e is high o the cooling is
insufficient, then the inte nal tempe atu e may exceed
the safe level. OVERHEAT LED lights on, and the
gene ato stops the ope ation. Please allow fans to
cool it fo seve al minutes. When the tempe atu e
dec eases OVERHEAT LED lights off, and the
gene ato etu ns to no mal ope ation automatically.
P ess HV ON again to continue the ope ation.
Fou -digit LED display and cont ol knob with push-
button, which sets FREQUENCY and NUMBER OF
PULSES pa amete s. Push the knob up to a click to
toggle between them. The light on LED indicato
above the display shows the cu ent mode. The
FREQUENCY is indicated in kHz with a decimal dot.
Fo example, 1 Hz is indicated as 0.001; 100 kHz is
indicated as 100.0. The complete lists of the p eset
f equencies and numbe of pulses a e shown in
Appendix A.
Two
-
digit LED display and cont ol knob with push
-
button, which sets pulse ENERGY pa amete . The
ene gy can be adjusted f om 50% to 99% with 1%
step. Push the knob up to a click to switch into TEST
mode. The light on LED indicato above the display
shows the cu ent mode. HV ON/HV OFF push button
is blocked in the TEST mode. LED display shows 00,
which means ze o output powe . T igge ing sequence
f om the inte nal o exte nal sou ces goes to SYNC
OUT connecto , which allows testing the t igge ing
and checking the t igge ing sequence without applying
HV pulses to the load. Push the knob again to toggle
back into pulse ENERGY mode.
MEGAIMPULSE LTD. 10

BNC output connecto fo SYNC OUT pulses
, which
a e gene ated simultaneously with each successful
t igge ing in each channel. The f ont edge of the
SYNC OUT pulse p ecedes the HV output pulse by
~0.7 µs. SYNC OUT pulse du ation is 400 ns, and the
amplitude is 3V@50Ω.
The non-latching button (black) toggles inte nal and
exte nal t igge ing modes. The light on LED indicato
shows the cu ently chosen mode.
Channel 1 ON/OFF non-latching button (yellow),
LED indicato , and Channel 1 BNC type SYNC IN
connecto . LED indicato continuously lights on when
the channel is active and blinks with 2 Hz f equency
when the channel is active and successfully t igge ed
by the exte nal pulses. Simila cont ol elements a e fo
channels 2, 3, and 4.
Main powe supply ON/OFF toggle switch.
Elect onic fuse.
Use manual of NPG18P14 (NPG18N14) 11

PUTTING THE GENERATOR INTO OPERATION
 Please st ictly follow the desc ibed steps. It helps to p event damage to the
gene ato , othe equipment, and pe sonnel inju y.
Step 1.
Unpack the gene ato and check the p esence into the package the
following items:
- NPG18P14 (NPG18N14) nanosecond pulse gene ato ,
- th ee-te minal powe supply cable with live, neut al, and g ound contacts,
- HV output coaxial cables with 75 Ohm impedance, 4 pcs.
Step 2.
Set up the gene ato . P ovide the p ope g ounding of the gene ato by
connecting to a th ee-te minal powe supply wall outlet with g ound contact
and/o by connecting g ounding wi e to the g ound contact of the load.
Step 3.
Check HV coaxial connecto s on the ea panel of the gene ato and HV
coaxial cables. The connecto s should be clean, f ee f om dust and di t. Clean the
connecto s with alcohol and/o cotton bud if necessa y. Please apply a d op of
pu e silicone g ease befo e mating the connecto s. G ease fills the ai gap between
the pai of the connecto s and eliminates possible glow discha ge inside.
Attach the cable connecto s to the HV connecto s on the ea panel. The
tight and fi m contact of the connecto s is impo tant fo safe ope ation. Even a
small ai gap between the connecto pai may esults in a glow discha ge, a cing,
and damage to the gene ato and the cable.
The following p ocedu e is ecommended fo obtaining good and tight
contact:
1. Align both connecto s.
2. Hold the gene ato by one hand to p event moving and p ess the cable
connecto by anothe hand towa d the gene ato connecto .
3. Sc ew the cable connecto nut by hand, usually one o two tu ns. Do not
otate the cable connecto body.
4. P ess the cable connecto towa d the gene ato connecto again.
5. Again, sc ew the cable connecto nut one o two tu ns.
6. Repeat steps 4 and 5 up to tight contact.
It is highly ecommended afte the fi st testing of the gene ato to check
whethe the tight contact of the connecto s is obtained. Unsc ew the cable
connecto . It should be no ozone o bu nt smell f om the connecto s o bu nt
t aces visible.
MEGAIMPULSE LTD. 12

Do not disconnect and connect the HV connecto s many times to p event
them f om wea ing and contamination. Silicone g ease is al eady applied to both
connecto s at the facto y. It emains between the mating connecto pai fo a ve y
long time and p events discha ge inside.
Step 4.
Connect anothe side of the coaxial cables to the load. The additional wi es
fo connection to the load may be used. Solde the high voltage contact of the load
to the cent al coaxial cable wi e and sc ew/solde g ound contact of the load to the
cable b aid. Please keep the length of the wi es between the coaxial cable and the
load as sho t as possible.
 Mo e than 10 cm additional wi es between the load and coaxial cable esult
in excessive st ay inductance and may disto t the pulse wavefo m. In
addition, long wi es wo k like an antenna and inc ease the elect omagnetic
inte fe ence to othe equipment.
 The length of the output coaxial cable is 3 mete s. Using the sho te coaxial
cable may esult in damage to the gene ato .
Step 5.
Connect powe supply cable to the wall powe outlet.
Tu n on the gene ato by the main powe supply toggle switch on the f ont
panel. The fans should sta t to otate, and the indicato s light on.
Step 6.
Test the gene ato ope ation in the inte nal t igge ing mode. Toggle the
gene ato into inte nal t igge ing, activate all the channels, set the f equency to 10
Hz, numbe of pulses in a bu st to 1, and pulse ene gy to 50%. P ess the HV
ON/OFF push button. Red LED on the button lights on, and output HV pulses
should be gene ated. Inc ease the amplitude, f equency, and numbe of pulses by
the co esponding knobs as necessa y.
Step 7.
Always stop the ope ation of the gene ato by HV ON/OFF switch. Afte
that, you can tu n off the gene ato with the main powe switch. Please allow
cooling of the gene ato by fans fo seve al minutes afte a long time of ope ation
at high pulse amplitude and f equency.
Use manual of NPG-10/100k (NPG-10/100kN) 11 Use manual of NPG18P14 (NPG18N14) 13

EXTERNAL TRIGGERING
The exte nal t igge ing mode is the most flexible. Some ope ation egimes
can be ealized in this mode only, fo example, single pulse mode and independent
t igge ing of the channels with diffe ent epetition ates, delays, and numbe of
pulses in the bu sts. The e a e two possible exte nal t igge ing modes: exte nal
t igge ing and exte nal bu st enable.
External triggering ode
Please toggle the gene ato to EXT mode by button 14. LED indicato 15
should light on. Apply t igge ing pulses to the co esponding SYNC IN connecto
16. Fou t igge ing pulse sequences should be applied to fou SYNC IN
connecto s fo the simultaneous fou -channel ope ation. Each channel can be
independently activated/deactivated by buttons 17. LED indicato s 18 light on, if
the channel is active, and blink with 2 Hz f equency if the channel is active and
successfully t igge ed by the exte nal pulses.
Fig.5. Exte nal t igge ing mode. Channel 1 (o ange line) is the exte nal t igge ing
pulses applied to SYNC IN connecto , Channel 2 (g een line) is the SYNC
OUT pulses. Each t igge ing pulse esults in a single output HV pulse.
MEGAIMPULSE LTD. 14

The impedance of SYNC IN inputs is 50 Ohm. Please use 50 Ohm
impedance coaxial cables with BNC connecto s fo the t igge ing pulses feeding.
The ecommended t igge ing pulse amplitude is +5 V, and pulse width is 1 µs.
The t igge ing occu s by the ising edge of the t igge ing pulse, and the inte nal
gene ato delay up to the output HV pulse is about 700 ns. The typical output
pulses jitte (RMS) is 1 ns.
The t igge ing pulse should be sho t (1 µs fo instance) fo the ope ation in
this mode. In this case, each t igge ing pulse esults in a single HV output pulse,
of cou se, if the t igge ing is not blocked by the cont ol system due to too high
f equency o too many pulses in a second (see Fig.5).
 The maximum allowable pulse f equency and the numbe of pulses within
a bu st a e limited by set FREQUENCY and NUMBER OF PULSES
pa amete s. Please set the equi ed values by knob 6. Afte the successful
t igge ing, the cont ol system blocks the next t igge ing up to the end of the
pe iod set by the FREQUENCY pa amete . The cont ol system counts the
t igge ing events and blocks the next t igge ing up to the end of 100 ms
inte val if the numbe of pulses exceeds the set NUMBER OF PULSES
(pe second) pa amete divided by 10.
Fig.6. Exte nal bu st enable mode. The bu st of five output pulses (Channel 2,
g een line) with 10 µs pe iod set by 100 kHz FREQUENCY pa amete is
fo med by a single 45 µs t igge ing pulse (Channel 1, o ange line).
Use manual of NPG18P14 (NPG18N14) 15

External burst enable ode
The gene ato automatically switches to this mode if the exte nal t igge ing
pulse is long. The exte nal t igge ing pulse fed to SYNC IN connecto wo ks as
enable signal, and HV output pulses un continuously with the set FREQUENCY
while the t igge ing pulse level is high. The othe ope ation pa amete s a e simila
to the exte nal t igge ing mode. As an example, the bu st of five output pulses
(Channel 2, g een line) with 10 µs pulse-to-pulse delay (100 kHz f equency)
fo med by a single 45 µs du ation t igge ing pulse (Channel 1, o ange line) is
shown in Fig.6.
The ope ation with the bu sts of 40 pulses with 10 µs pulse-to-pulse delay
and 100 Hz bu st epetition ate is shown in Fig.7. One can see the 395 µs
du ation t igge ing pulses with 100 Hz epetition ate (Channel 1, o ange line),
which esult in fo ming the bu sts of 40 pulses each (Channel 2, g een line). The
gene al view of the t igge ing pulses sequence and output pulses bu sts is shown
in the uppe pa t of the oscillog am. The zoom view of a t igge ing pulse and bu st
of 40 output pulses is shown in the bottom pa t.
Fig.7. The bu sts of 40 pulses with 10 µs pulse-to-pulse delay (Channel 2, g een
line) and 100 Hz bu st epetition ate.
MEGAIMPULSE LTD. 16

ELECTRONIC FUSE
The gene ato is equipped with the elect onic fuse 19. The fuse tu ns off
the gene ato in the case of a sho t ci cuit o ove loading. Please tu n off the
gene ato by main powe supply toggle switch 11, push the ed button on the fuse,
and tu n on the gene ato . If the fuse b eaks the powe again, then please consult
with the manufactu e .
WARRANTY
Please see you sales ag eement to dete mine the wa anty pe iod and
condition. The gene ato has wa anty seals. Removing the wa anty seals and
unautho ized opening of the gene ato enclosu e te minates the wa anty.
Use manual of NPG18P14 (NPG18N14) 17

Appendix A.
1. List of p eset f equencies. 4 kHz and above a e available in bu st ope ation
mode only.
F equency
4 digits display
F equency
4 digits display
1 Hz
0.001
2.5
kHz
002.5
2 Hz
0.002
3 kHz
003.0
3 Hz
0.003
3.5 kHz
003.5
4 Hz
0.004
4 kHz
*
*
)
004.0
5 Hz
0.005
4.5 kHz
004.5
6 Hz
0.006
5 kHz
005.0
7 Hz
0.007
5.5 kHz
005.5
8 Hz
0.008
6 kHz
006.0
9 Hz
0.009
6.5 kHz
006.5
10 Hz
0.010
7 kHz
007.0
20 Hz
0.020
7.5
kHz
007.5
30 Hz
0.030
8 kHz
008.0
40 Hz
0.040
8.5 kHz
008.5
50 Hz
0.050
9 kHz
009.0
60 Hz
0.060
9.5 kHz
009.5
70 Hz
0.070
10 kHz
*)
010.0
80 Hz
0.080
15 kHz
015.0
90 Hz
0.090
20 kHz
020.0
100 Hz
0.100
25 kHz
025.0
200 Hz
0.200
30 kHz
030.0
300
Hz
0.300
35 kHz
035.0
400 Hz
0.400
40 kHz
040.0
500 Hz
0.500
45 kHz
045.0
600 Hz
0.600
50 kHz
050.0
700 Hz
0.700
60 kHz
060.0
800 Hz
0.800
70 kHz
070.0
900 Hz
0.900
80 kHz
080.0
1 kHz
001.0
90 kHz
090.0
1.5 kHz
001.5
100 kHz
100.0
2 kHz
002.0
10
1
kHz
*
*
*
)
101.0
*) the default value is 10 kHz, which is set afte powe on the gene ato
**) 4 kHz and mo e a e available in the bu st mode only
***) please set 101 kHz inte nal f equency if you want to ope ate in exte nal
t igge ing mode with up to 100 kHz epetition ate
MEGAIMPULSE LTD. 18