user manual - Megaimpulse Ltd.
Contents
1. Avgs 4 El oo EES E BE BE de More SE oeo Hy MEER EET gt gt 1 of 2 MESSE Status Delet width 1v V amptd 1 All 5 Current 29 677012 ns 4 7213 V Mean 32 1073113 ns 4 66452 V Min 29 656869 ns 4 6201 V Max 33 669028 ns 4 7550 V Fig 3 Recommended triggering pulse waveform MEGAIMPULSE LTD 10 WARRANTY Please see your sales agreement to determine the warranty period and warranty condition The generator has warranty seals gt Removing of the warranty seals terminates the warranty PPG 2 1000 subnanosecond pulse generator user manual 112. initially DC power supply cable from AC DC switching power supply to the generator Plug AC DC switching power supply into AC outlet Check the low voltage power supply is DC 18V high voltage power supply is DC 90V 105V The exact recommended level of high voltage power supply is written in the generator TESTING PROTOCOL and on the sticker attached to the side panel of AC DC switching power supply Adjust the voltage levels by potentiometers if required Unplug AC DC switching power supply from AC outlet If standard AC DC switching power supply is not included Step 3 Please set external power supplies DC 90V 105V 2A and DC 18V 2A The exact recommended level of high voltage power supply is written in the generator TESTING PROTOCOL Switch off power supply Connect the output coaxial cable and load to the generator Connect triggering pulse generator MEGAIMPULSE LTD 8 Connect four wire DC power supply cable The ground wires are marked by black color Low voltage supply wire is marked by 18 label high voltage supply wire is marked by 105 label Step 4 Switch on plug AC DC switching power supply Both green LED 18V DC and 100V DC on the generator should light on Set external triggering pulses frequency to 1 kHz Apply triggering pulses orange LED SYNC IN should light on 2 kV output pulses should be generated Check them Set external triggering pulses frequency to required
3. temperature of the generator and reduces temperature drift of the output pulse There are internal over temperature and over frequency protection If temperature of the generator is too high then generator stops the operation and red LED OVERHEAT lights on In this case please allow idle operation during few minutes When the temperature decreases the generator returns to normal operation regime automatically If the triggering pulses frequency is more than 1 MHz then the generator blocks triggering and red LED OVERLOAD lights on Please reduce the triggering pulses frequency below or equal to 1 MHz PPG 2 1000 subnanosecond pulse generator user manual 5 TECHNICAL SPECIFICATION OF PPG 2 1000 SUBNANOSECOND PULSE GENERATOR Pulse rise time 20 80 levels Internal delay from leading edge of triggering pulse to output pulse Temperature drift of internal delay Triggering Input triggering pulse connector Triggering pulse requirements Power supply Size MEGAIMPULSE LTD 2 kV Positive unipolar bell like pulse 50 Ohm 600 ps 1 5 ns 1 MHz 40 ps 200 ps lt 100 ns lt 4ns external SMA 5V amplitude at 50 Ohm 30 ns width lt 3ns rise time Dual DC 90V 105V 2A 18V 2A 250 x 110 x 72 mm without mounting flanges 1 5 kg INPUT CONNECTORS AND CONTROL LED SIDE VIEW 100V DC SYNC IN OVERHEAT OVERLOAD Control LED from left to right 18V DC green low voltage p
4. SUBNANOSECOND PULSE GENERATOR PPG 2 1000 USER MANUAL 2015 Megaimpulse Ltd Copyright 2015 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 Products and corporate names appearing in this manual may or may not be registered trademarks or copyrights of their respective companies and are used only for identification or explanation and to the owners benefit without intent to infringe Megaimpulse Ltd contact information Address 26 Polytechnich
5. eskaya str St Petersburg 194021 Russia WWW http www megaimpulse com e mail mp power ioffe rssi ru fax 7 812 297 3145 CONTENTS Dally MANUAL se EG AD EG Ee N EE RE AD EE Ee Ee Dad ss Piekise CONCE seen ER RR ER aa DE GE ee EE General view of PPG 2 1000 subnanosecond pulse generator ees Description OF th generator us NE SE OR ee Ee De oe eds MECHMICAIS PE CINICALION ee ie EE EE ee ee ee de Ge Front and rear panels VIEW sa end Ee be ee oe be ds at Putting hess enerator 1nto Operation ss ae de oe ee nina Tries SEINS OF the oeneralOE A a a Ee n and Ee DE EER AIS EE AA OE A OE OR EE OE OE PPG 2 1000 subnanosecond pulse generator user manual SAFETY MANUAL Electrical safety PPG 2 1000 generator is high voltage equipment Please be very careful and operate by qualified personnel only There is a risk of electric shock strong electromagnetic interference damage of generator or other electronic equipment in case of improper use It is strongly prohibited to switch on the generator without output coaxial cable We recommend using of 50 centimeters length or more coaxial cable between the generator and the load antenna or first attenuator to prevent permanent damage of the generator There is a risk of electrical arcing on the open coaxial connector and destruction of output circuit of the generator When adding or removing generator to or from the system ensure that the power supply is unplugged in OFF state P
6. lease apply power supply voltages only after connecting output and input coaxial cables PPG 2 1000 generator is high power equipment Please allow free air flow around the generator for good cooling Please do not place the generator in fan down position on the table surface because it prevents normal air flow Operation safety MEGAIMPULSE LTD Please read this manual before installing and using of the generator Before using the product make sure that all cables are applicable and not damaged High voltage connectors should be clean and dry free from dust dirt and any obstacles To avoid short circuits keep metal parts like clips screws and staples away from the generator The generator is designed to work in normal laboratory conditions Avoid dust humidity and temperature extremes Do not place the generator in any place where it may become wet Place the generator on a stable surface If you encounter any technical problem with the generator please contact with Megaimpulse Ltd Do not try to repair the generator by yourself PACKAGE CONTENT Please check the package for the following items v v v PPG 2 1000 subnanosecond pulse generator hereinafter generator DC power supply cable User manual Optional items v v Dual voltage AC DC switching power supply AC 90V 264V 47Hz 63Hz DC 90V 105V adjustable 2 3A 18V 2 8A Semirigid coaxial cable assembly N connector SMI141 cable N connec
7. n is 30 ns rise fall times is 1 ns Longer than 3 ns rise time results in increasing of the output pulse jitter The generator requires external dual voltage DC power supply including DC 18V low voltage and DC 90V 105V high voltage Output pulse amplitude is proportional to the level of high voltage DC supply It is possible to adjust the output pulse amplitude smoothly by adjusting high voltage DC supply Do not exceed DC 105V level for high voltage supply There is a risk of damage of the generator The generator comes with four wires DC power supply cable The ground wires are marked by black color Low voltage supply wire is marked by 18 label high voltage supply wire is marked by 105 label MEGAIMPULSE LTD 4 The contact pins on power supply connector are the following Pin 1 DC 90V 4 105V supply voltage Pin 2 ground return DC 90V 105V Pin 3 DC 18V supply voltage Pin 4 ground return DC 18V PPG 2 1000 is high power unit The mean output power at 1 MHz repetition rate is 100 W Total power consumption is up to 200 W Therefore total energy efficiency of the generator is about 50 and up to 100 W should be dissipated Two fans and heat sink with thermal tubes are used for this purpose The rotation speed of the fans is determined by the current dissipated power and the temperature of the generator When the temperature becomes higher the rotation speed increases It helps to keep the stable
8. ower supply 18V DC is applied 100V DC green high voltage power supply 90V 105V DC is applied SYNC IN orange triggering of the generator OVERHEAT red operation is stopped due to overheating of the generator OVERLOAD red triggering is blocked because frequency of triggering pulses is above 1 MHz Connectors SYNC IN SMA type input connector for external triggering signal POWER SUPLLY connector for external DC power supplies OUTPUT CONNECTOR SIDE VIEW Connectors OUTPUT N type output connector PPG 2 1000 subnanosecond pulse generator user manual PUTTING THE GENERATOR INTO OPERATION gt Please follow strictly the described steps It helps to prevent damage of the generator and other equipment Step 1 Unpack the generator and check the presence into the package of the following items PPG 2 1000 pulse generator power supply cable optional items Step 2 Dual voltage AC DC switching power supply DC 90V 105V adjustable 2 3A 18V 2 8A Semirigid coaxial cable assembly N connector SMI41 cable N connector for the output signal feeding Flexible coaxial cable assembly SMA connector RG316 cable SMA connector for the input triggering signal feeding Flexible coaxial cable assembly SMA connector RG316 cable BNC connector for the input triggering signal feeding gt If standard AC DC switching power supply optional is included Do not connect
9. range below or equal to 1 MHz Please pay attention that standard GHz range attenuators are not suitable for direct registration of output pulses because of extremely high peak power Even 100W and more power attenuators will be broken inevitably We recommend using of high voltage directional coupler or GHz range well adjusted resistive splitter The generator is designed for long time operation at max repetition rate 1 MHz But it can be overheated in case of limited air flow around the generator or high room temperature Red LED OVERHEAT lights on in this case and generator stops the operation Please allow idle operation during several minutes for the cooling LED OVERHEAT lights off and generator returns to normal operation automatically when the temperature decreases The maximum repetition rate is 1 MHz If triggering pulses frequency is above this level then red LED OVERLOAD lights on and generator stops the operation Please reduce the triggering pulses frequency PPG 2 1000 subnanosecond pulse generator user manual 9 TRIGGERING OF THE GENERATOR The recommended triggering pulse waveform is shown in Fig 3 Nominal triggering pulse amplitude is 5V at 50 Ohm pulse duration is 30 ns rise fall times are ns Longer than 3 ns rise time may results in increasing of the output pulse jitter File Control Setup Trigger Measure Analyze Utilities Demos Help 18 Sep 2015 4 38 PM 10 0 GSa s 1 00 kpts ST 1 00 GHZ
10. tor for the output signal feeding Flexible coaxial cable assembly SMA connector RG316 cable SMA connector for the input triggering signal feeding Flexible coaxial cable assembly SMA connector RG316 cable BNC connector for the input triggering signal feeding Fig 1 PPG 2 1000 subnanosecond pulse generator General view from input connectors and control LED side PPG 2 1000 subnanosecond pulse generator user manual 3 DESCRIPTION OF THE GENERATOR PPG 2 1000 generates subnanosecond unipolar bell like 2 kV pulses with up to 1 MHz repetition rate Output pulse waveform is shown in Fig 2 The generator is designed to operate on 50 Ohm matched load only i e 50 Ohm resistive load or matched impedance antenna connected by 50 Ohm impedance coaxial cable Operation on unmatched load inevitably results in part of energy reflection from the load back to generator overheating of the generator and possible damage It is strongly prohibited to switch on the generator without the load with open connector We recommend using of 50 centimeters length or more coaxial cable between the generator and the load antenna or first attenuator to prevent damage of the generator in case of load breakdown 2 5 0 5 0 0 0 5 Fig 2 PPG 2 1000 output pulse waveform PPG 2 1000 should be triggered by external triggering pulse There is no internal triggering mode Nominal triggering pulse amplitude is 5V at 50 Ohm pulse duratio
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