Data Sheet & User Manual - stahl
Contents
1. e p ae 95 a ee ee ae S N112012 100n Dna Voltage Noise Density V sqrt Hz in 100k 1M 10M frequency Hz fig 4 8 Wide band voltage noise density 600 Hz to 2 5MHz observed at output while input being switched to GND i e shorted lower trace green or connected via 33kOhms to GND upper trace blue Measurement device PicoScope3224 in FFT mode with x80 preamplifier The green curve is essentially flat corresponding to an underlying level of approx 9nV VHz while the green trace related to a 33kOhm termination is higher due to the thermal noise of the 33kOhm resistor expected 24nV VHz and other parasitic current noise contributions 10 www stahl electronics com phone 49 6242 504882 fax 49 6242 504884 LS 30 User Manual Rev 1 2 S Maintenance The LS 30 switches are designed for years of reliable operation Under normal operating conditions they should not require electrical maintenance except routine cleaning of dust Exchange of ventilation fan is strongly recommended every 50 000 operation hours see below If any question should arise please contact the manufacturer Routine cleaning All ventilation openings should be checked periodically and kept free of dust and other obstructions A vacuum cleaner may be used to clean these vents when the unit is powered off The front panel may be cleaned periodically with a clean cloth and mild alcohol solution when t2. the switch inputs and outputs Switch l Input A OUT Input B fig 4 4 BNC and 4mm sockets for inputs and BNC output fuse sockets 7 www stahl electronics com phone 49 6242 504882 fax 49 6242 504884 LS 30 User Manual Rev 1 2 Fig 4 4 shows the BNC sockets for the two input voltages A and B and the switch output OUT Alternatively the input voltages can be applied to the two red 4mm laboratory sockets for which the black center socket serves as GND input The fuse sockets shown in fig 4 4 contain safety fuses for the two inputs In case extensive currents flow they may blow Nominal rating is 0 5 Ampere fast blow All voltages must reside in the interval between 15V and 15V to avoid damage to the device Please note that the capacitive load on the output may impair the switching speed performance Nominal loads from OpF to 300pF may be connected See also next section for waveforms traces 4 3 Output Characteristics Dynamic Response As soon as the internal switch connects either input A or B to the output the latter assumes the voltage on the respective input There is a time constant related to each voltage transition essentially given by the internal switch resistance approx 150 Q the internal output current limit approx 250mA and the capacitive load on the output including all cables to an experimental setup In case of BNC cables one may count about 100pF per meter cable length therefore extensive
3. agnetic fields can impair damage or even destroy this device e g proximity to a superconducting magnet A maximum external field strength of no more than B 10mT is admissible Not observing this important limit can lead to severe overheating of the device and increases the hazard of fire ai Connecting to mains power Connect the device to the mains power supply 220 to 240V ac by using an appropriate power cord being properly wired and providing a grounded outlet The power cord must be suited with respect to possible load currents and should be rated to 2A current Cabling of voltage outputs Always provide appropriate and safe cabling when connecting the device to other devices or vacuum experimental setups Cabling is preferred using coaxial cable with proper shielding BNC connector cables are a suitable choice in order to ensure proper shielding against external noise pickup and in order to provide protective ground for safety reasons 6 www stahl electronics com phone 49 6242 504882 fax 49 6242 504884 LS 30 User Manual Rev 1 2 4 Operation and Control Elements 4 1 Elements on the front plate Pos A Switch 1 se Pos A Switch 2 aG Pos A Switch 3 10 A oise Switch S 30 re ext control ext control ext control Low Noise Switch L 3U B AC DC max 15V Pewar Oa Pos 8 OV 5V N Pos B V SV 5 Pos 8 G ISV e G A OV 8 I OV 8 je Ov BI mains supply Switch 1 Switch 2 Switch 3 switch ext manual
4. dium fast blow 1 0A Power Consumption 19 00 wide x 10 deep x 1 height unit Front panel mounting holes are Case dimensions configured for M6 rack configurations weight approximately 1 2kg 12 www stahl electronics com phone 49 6242 504882 fax 49 6242 504884 LS 30 User Manual Rev 1 2 DECLARATION OF CONFORMITY Manufacturer s Name Dr Stefan Stahl Electronics for Science and Research Manufacturer s Address Kellerweg 23 67582 Mettenheim Germany Declares that the product Product Name fast Low Noise Signal Switch LS 30 Model Number LS 30 Product Options This declaration covers all options of the above product s Conforms with the following European Directives The product herewith complies with the requirements of the 1 Low Voltage Directive 73 73EEC 2 EMC Directive 89 336 EEC including 93 68 EEC and carries the CE Marking accordingly Date Of Issue 18 Sept 2012 General Director 13 www stahl electronics com phone 49 6242 504882 fax 49 6242 504884
5. ected to an This product is grounded through the grounding earth safety ground conductor of the power cord To avoid electrical hazard the grounding conductor must be connected to protective earth ground Do not modify the unit Do not make electrical or mechanical modifications to a e Changing the cabling when voltages are present at the outputs can lead to formation of harmful sparks Do not operate in wet damp conditions To avoid electric shock hazard do not operate this product in wet or damp conditions Protect the device from humidity and direct water contact Beware of external magnetic fields External magnetic fields can impair damage or even destroy this device A maximum external field strength of no more than B 10mT is admissible Having placed the device at any time into an external magnetic of bigger B 10mT regardless if power was turned on or off can lead to severe overheating of the device and severely increased hazard of fire service persons only factory qualified service personnel only Do not block chassis ventilation openings Slots and openings in the chassis are provided for ventilation purposes to prevent overheating of the equipment and must not be restricted All case vents should continuously be cleared fan inlet at rear side air outlet at rear side in order to prevent overheating Routinely cleaning from dust After long operation or operation in a dusty environment it is strongly recommended to have
6. ere provided with an external voltage of 15V and 15V respectively At the edges of the control signal the switch is triggered and switches from 15V to 15V and after 500us back to 15V Trace 2 shows the control signal being used to trigger the switch A rectangular pulse results with steep slopes and constant voltage static levels For further details on the slope of the waveforms see section 4 3 20 Voltage V 200 0u 0 0 200 Ou 400 0u DO OU 800 0u 1 0m Time s fig 2 3 Oscilloscope traces of a positive pulse At 500us duration The green trace shows the digital control signal the blue shows the output signal Oscilloscope Rigol DS1302 CA capacitive load 100pF 5 www stahl electronics com phone 49 6242 504882 fax 49 6242 504884 LS 30 User Manual Rev 1 2 3 Installation 3 1 Mechanical and Electrical Installation Positioning Provide sufficient air cooling of the device and locate it in normal horizontal position to allow for defined air convection Rack mounting into a standard 19 rack is possible as well as resting the device on a table If mounted in a rack please make sure that all case vents are permanently cleared fan inlet at rear side air outlets at rear side in order to prevent overheating air outlet ventilation fan inlet Wes s 9p eo s sse LC zi E fig 3 1 Keep air vents always cleared to ensure sufficient ventilation Beware of external magnetic fields Strong external m
7. ext manual ext manual LS 30 fig 4 1 front plate elements The front plate contains the control elements of the device It is powered up after turning on the rear side mains supply switch and also the power button on the front plate The Power on LED green indicates proper operation of the internal circuitry Pos A Switch 1 ext control Pos B 5V A OV B fig 4 2 manual switch BNC input and LED indicators Each channel features a three position manual switch fig 4 2 Lifted upwards the output rear side is connected to the input A moved into lower position it connects the output to input B In the center position of this switch the control voltage being applied to the BNC input defines the switch position A high level connects the output with A low level connects to B Common 5V OV signal may be applied to this BNC control input In practical cases a PC controlled Delay Gate generator or function generator is often connected to this BNC input The LS 30 device is rated for input voltages inputs A and B up to 15V DC vs GND The LED indicators on the right hand side show the switch status indicating which input A or B is connected to the output 4 2 Elements on the rear side Miss trest trer gee ME fig 4 3 rear side elements a triple channel version is shown The rear side of the device contains the ventilation elements 230V supply connector power on off switch with fuses and
8. he unit is powered off It is recommended to send the device to the manufacturer routinely in 4 year intervals for internal cleaning from dust Fan life time and temperature monitoring The air ventilation fan is a part which shows unavoidable deterioration in time Exchange of this part is strongly recommended after 50 000 hours of operation Please contact manufacturer for replacement Complete failure can lead to overheating of the device Several temperature fuses and other protection measures provide a certain degree of safety against fire hazard in this case Fire hazard Please note that excessive accumulation of dust inside the case of the device can lead to overheating This together with possible discharges increases the risk of fire caused by electrical sparks Routinely cleaning the device from dust minimizes this risk It is therefore recommended to send the device to the manufacturer routinely in 4 year intervals for internal cleaning from dust or to have it cleaned by an accordingly qualified electronical workshop Also air conditions containing oil mists e g in proximity to a vacuum pump or mechanical machines place a severe danger since inflammable substances could enter the device through the ventilation holes If in doubt cleaning by an accordingly qualified electronical workshop or the manufacturer is strongly recommended An increased hazard of fire may also occur if the device has been permanently or temporarily loca
9. ide the device are implemented as MOSFET transistors allowing fast switching transitions in the order of 20ns and less E input A yha switched output input B control input UV 5V z TTL CMOS logic level fig 2 2 Block diagram of a LS 30 device Inside the triple version the scheme exists three times 1 e there are three independent switches Unlike high voltage pulse generators the internal switch circuitry is implemented as fast static switch which means that the applied control input level defines the static switch position as illustrated in the scheme above The output is connected to the selected input by a transistor based resistor The non selected input is isolated from the output by a high isolation resistance The input range for both inputs A and B is 15V to 15V each Either polarity is applicable In case the latter voltage is exceeded for a short time it will be clamped to approx 16V Note that voltages 4 www stahl electronics com phone 49 6242 504882 fax 49 6242 504884 LS 30 User Manual Rev 1 2 being substantially higher that 15V which are permanently applied to an input or output will damage the device Application example Generation of 500us duration positive going 30Volt pulse The subsequent oscilloscope screen shot shows a typical application example A control pulse of logic level high 5V low OV is applied to the control input Inputs B and A w
10. ly long cables should be avoided The following oscilloscope traces show voltage step transitions observed at the output with a medium capacitive load 100pF for further illustration 20 VEER EPER LENE SEP DENN DEY re es as ee SIN ea H HD ey Mra ee Aes E Mey Dare Dace YSN ees crakear pe ape EPE Voltage V Voltage V aia alala ies ii ieee OO alaia daiala dalada sadada iadaa aladel Po oi D daiala daiala ee es dalali aalala dalak daiala alai dal ulah aai aad d aii aii iibi da 250 0n 200 0n 150 0n 100 0n 200 0n 150 0n 100 0n 50 0n 0 0 50 0n 100 0n Time s Time s 50 0n 0 0 50 0n 100 0n 250 0n fig 4 5 left frame negative voltage step of 30V from 15V to 15V with medium capacitive load C 100pF at the output right frame positive voltage step of 30V with the same capacitive load transient rise time 10 to 90 of voltage step size is in the order of 22ns in each case Oscilloscope Rigol DS1302 CA 300MHz bandwidth Green trace control signal blue trace output signal Noise and Ripple In contrast to other devices based on switched circuit power switching technology the HS series devices feature a very low noise level This makes them specially suited for ion traps low energy beam line applications or medical sensors Each output exhibits a very low broadband noise DC to 20MHz of smaller than 5uV and a low ripple level 50Hz in the order of 4uV ms In general
11. ted in proximity to a strong e g superconducting magnet A maximum external field of B 10mT 1s admissible 1 www stahl electronics com phone 49 6242 504882 fax 49 6242 504884 LS 30 User Manual Rev 1 2 6 Specifications Control Input pe ee Conditions and remarks ee required drive level OV and 5V 2V to 6V vs GND threshold PAV no input impedance kQ 6E static resistance from A or B to OUT 150Q 1800 lour lt SOMA on state isolation resistance from voltage differences from A or B to RorBioGuT smo OUT smaterorequal 18V o A or B to OUT 3nA 15nA OUT smaller or equal 15V intrinsic switch capacitance 25pF to 35pF Noise lt S1OVms DC Io 20MHS i ee H om eea e change to output reaction 160ns positive or negative going delay ner nama PT RC HAC infinite max pulse duration FP infinite min pulse duration 0 Output rise or fall time 10 to 90 step size ee capacitive load of 100pF ee a Input Voltage Rating TT Input A or B vs GND a 15V both polarities may be applied vs GND 200mA medium fast fuse replaceable on rear side Environmental Conditions Se Magnetic Field Bmax must never be exceeded Storage Temperature 55 C to 85 C Operating Humidity amp noncondensing relative humidity up to 95 between temperatures of Temperature 10 C and 35 C AC input voltage 230V ac at 50HZ Power Supply The power entry module is EMI RFI filtered Fuse me
12. the internal parts of the device cleaned by the manufacturer or an appropriately qualified workshop in order to reduce the hazard of overheating No outdoor operation Outdoor operation of the device is not admissible 3 www stahl electronics com phone 49 6242 504882 fax 49 6242 504884 LS 30 User Manual Rev 1 2 2 General Information and Overview 2 1 Purpose and Description of the Device Purpose of the LS 30 devices is the fast switching of electrodes electrostatic lenses beam deflectors or ion traps Unlike DC power switches the outputs expect capacitive loads in the 100pF range The outputs are optimized for high stability and very low noise The switches are housed in standard 19 inch rack mount cases They are available in single channel to triple channels versions Individual switches are completely independent except that they share a common GND fig 2 1 front view of a LS 30 device triple version 2 2 Functional Principle and Block Diagram The following scheme displays a block diagram of the internal structure and illustrates the functional principle The control input BNC socket on front plate defines the position of the internal high voltage switch which connects either input A or input B to the output A digital signal TTL CMOS level OV 5V may be applied to this control input A three position manual switch on the front side allows to override the digital control signal The switching elements ins
13. the outputs are completely free of parasitic switching spikes in the RF region The subsequent graphs show further details regarding observed waveforms and noise densities 8 www stahl electronics com phone 49 6242 504882 fax 49 6242 504884 LS 30 User Manual Rev 1 2 LS30 Noise 60kHz low pass filter 5ms div 20 November 4 5 2015 Stahl Electronics Captured with Rigol DA1302CA x200 Amplitifer and 60kHz low pass filter used Voltage pV 20 30 time ms fig 4 6 Output signal being observed using a 200V V preamplifier and digital oscilloscope while input being switched to GND A statistical signal is visible and an additional 50Hz Ripple of about 4uVrms or 15uVpp A 60kHz low pass filter was used to define the frequency window of this measurement 1 e DC to 60kHz The displayed span on Y axis is 42uV LS30 Noise 60kHz low pass filter 100p1s div November 4 5 2015 Stahl Electronics Captured with Rigol DA1302CA x200 Amplitifer and 60kHz low pass filter used S 8 Voltage pV SES B D ne That D VA R RS iS L RST HAEL ENEE T 7 600 400 200 0 200 400 600 time s fig 4 7 Recorded trace of same configuration as in figure 4 6 but faster time scale A statistical signal is visible of approx 5uVpp amplitude 9 www stahl electronics com phone 49 6242 504882 fax 49 6242 504884 LS 30 User Manual Rev 1 2 Noise Density of selected channel SES SSH Lanni EEE
14. us Stahl electronics com LS 30 Low Noise Switch 15V Range LS 30 User Manual 1 2 doc 11 Nov 2015 Data Sheet amp User Manual Rev 1 2 Model Number LS 30 Triple www stahl electronics com LS 30 User Manual Rev 1 2 TABLE OF CONTENTS 1 Safety Hints 2 General Information and Overview c cece e e 2 1 Purpose and Description of the Device ccc ccna ees D2 Functional Principle and Block Diagram eee e Ey IAG HT G Te a E E aii yess nays TA E care aes pee ean aaa om eae Ea naa ee cod Can emaneinc 3 1 Mechanical and Electrical Installation 0 0 ccc cece cece cece 4 Operation and Control S T 4 1 Elements o the front Bae aA evs Yed ERAT ACER rode 4 2 PICmMenis Om the rear SIUC sassun sscescareunweicuacasoueeendescaterew eases 4 3 Output CMALAClCLISlICS irene ienser inne T saw surmedseesemnnneiuees 5 Maintenance ER Tene le IRO TETE Re een ATT 2 www stahl electronics com phone 49 6242 504882 fax 49 6242 504884 11 12 13 LS 30 User Manual Rev 1 2 1 Safety Hints Read all installation operation and safety Prior to operation thoroughly review all safety instructions installation and operating instructions accompanying this equipment Rear side switch turns device completely If the device is not in use for a longer time it 1s off recommended to turn the mains switch at rear side off This equipment must be conn
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