PDF user manual
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1. 110 230 VAC 50 60 Hz This connector contains also 5A fuse HV OUTPUT connector supplied with the driver connects the load to the module RS 232 connector optionally connects module to the computer Safety Do not remove coverage case from the Pockels cell driver e Do not self repair the driver e Do not operate with disconnected load e Avoid casual contacts of personnel with output cables and with the load e Do not connect disconnect cables while driver is turned on e Do not turn the driver on if it was already damaged with water chemicals mechanical or electrical shock Operations l Connect Pockels cell to the driver connect driver to the mains 2 Turn POWER switch on 2 Select desired VOLTAGE REP RATE PULSE WIDTH and desired OPERATING MODE using corresponding buttons Press START button Since that moment module starts operations It must be indicated with corresponding LED Press START button again to stop operations Turn POWER switch off Operations RS 232 interface OM B WN ON Ensure that POWER switch is off ensure that computer is off Connect Pockels cell driver to the computer using corresponding cable Turn POWER switch on turn the computer on Run HyperTerminal or analogous software Send to the driver commands that set desired parameters of operations Send to the driver r command to start operations Send to the driver 1 command to stop o2. AAAAARAANARARMARARAANARARRRMANARRANANAARANARARRRMANARRRNAARAANANARRAMANARAAMAAAARRMARARRRNANARRANANARRANANARRANANARRANANARRANANARRANARARRANARARRANA Output 2 high level is adjustable push up scheme pull down scheme repetition of external signal mode Working modes Pulses up mode pulses down mode repetition of external signal mode external a z a ean S see Part numbers section Pulse width 1 us DC in external synchronization mode l us 1 f f is repetition rate in Hz in internal synchronization modes DAARNARRRARAARARARAARARARAARARARARRARARARRARARAARARARAARARAAAARARNANARARARAARARARAARARARAARARARARRARARARRARARAARARARAARARARAARARARAARARARNARARARARRRAARAARARAN ARARARARRARNRARRARARARRRRNRARRRRARARRRARRARRAAARARRARARARRRRARARRRRARARRRRNRARRRRARARRRRARARRRRARANRRRARARRRARRARRRRARANAARARARRRRARARRRAARARRRAAARRRRAAARRARRARARRRARRARRRRARRARRRMARNRRAMARAARRARRARRAMARNRRRAARNARANARARRRARRAARRARRAARAARRARRRAARARRRAARARRRAARARRRAARARRRARRARRANA DAARAARARARARRARAANARARNANARARNANARARNANARNRNANARARNANARNANANARARNRNARARARAARRRARARRARARAARAR ARMAR ARARA ARAR ARAARARARRARRRARARRARARARRARAARARARARARRRRARARRARAM ARNRNAAARARNRARRNANRARRNANAARANANRARRRANANRRNANRANRRANANRRRANANARRANANNRNANRNNRNANRNMRNANANNRNANANMRRANANARNANANARNANRNRANANRNARNANRNRARANANARRANANARRANANARRANANARRANANARRANANARRANANARRANANARRANANARRANANARRANANARRANANARRANANARRANANARRANANARRANANARRANANARRANANARRANANANRANARARRRNA ARARA ARAARA RIRNAR ARARNAR ARRAN ARARRRARRARRANARARR
3. AGE buttons increase decrease voltage WIDTH indicator shows installed pulse width in us and ms units pulse width of us range has LI sign instead of the last digit WIDTH buttons increase decrease pulse width REP RATE indicator shows installed repetition rate in Hz and kHz units repetition rate of Hz range has H sign instead of the last digit REP RATE buttons increase decrease repetition rate EXT button switches the module between three modes e pulses up when this mode is selected normal state of the output 1s OV during the pulse output voltage is switched to high voltage when this mode is selected green LED nearby the IL sign is on e pulses down when this mode is selected normal state of the output is high voltage level during the pulse output voltage is switched to zero when this mode is selected green LED nearby the sign 1s on e external synchronization mode in this mode module receives from SYNCHRO connector and repeats at its output external logical signal when this mode is selected both LEDs are on SYNCHRO connector synchronization input for operations in external synchronization mode START button enables output and starts operations in selected mode with selected parameters the second pressure on this button stops operations when START button is pressed the red LED nearby indicates this Back panel MAINS connector supplied with the driver connects module to the mains
4. ANAR ARRAN ARARNRN ARAR RRA ARARRRARRARRRAARARRRNARARRRARR ARARNAR ARRAAARARARAARARARRRRRRRRAARRRRRAAR AE T ANRRARRRAN RRRRARRARRRAARARRRARRARRRAAR AARAA ARARRRAARARRRA ARAR RAA ARAR RAMAR ARRRARRARARAARARARAARARARARRRRARAARAR RRRA ARARA ARARRRAARAR ARAARA TAAA RRRRAARARRRAARARRRARRARRRARRARRRARRARRRARRRRRANARARRANARARRANARARRANARARRANARARRANARARRANARARRANANARRANARARRANANARRANANARRANARARRANARARRANARARRAN 10 90 level warranted at load capacitance 23 pF and below MECHANICAL SPECIFICATION Performance For continuous operation in internal synchronization modes pulses up and pulses down modes we warrant the performance table as follows 11 pF load capacitance Voltage kV 2 0 2 5 3 0 3 5 4 0 4 5 5 0 6 0 Max rep rate kHz 56 40 31 24 18 15 12 9 External synchronization mode shows usually a little higher performance In the burst mode short time operations performance is increasing approximately twice and may achieve 100 kHz value at low operating voltage and load capacitance Higher load capacitance decreases the performance Note modules with the higher performance are available on request How to order QBU BT XXYY ZZ where XX codes the maximal output voltage Vmax user selectable up to 6000V YY codes the minimal output voltage Vin 40 of Vmax ZZ codes options LJ low jitter option mandatory for 6kV modification optional for others jitter is as low as Ins delay time is as sho
5. by default Example v 2500 sets voltage to 2500 volts Typical output QBU BT 6024 LJ SP Capacitance load 11pF HV Probe about I3pF 6kV pulses
6. perations Turn POWER switch off Note it s possible but it s not recommended to use RS 232 and front panel user interfaces at the same time Technical notes e Performance of the module greatly depends on load capacitance Full performance see Performance section is achievable only under condition of 11 pF load and below Note higher load capacitance decreases maximal allowed repetition rate e Module s output is bipolar It means that 4kV pulse is physically formed by applying 2kV to positive output wire and 2kV to negative see figure 2kV OV 2kV Nevertheless all descriptions of HV output are given in terms of voltage differences Please keep it in mind e Sometimes output is delayed If no switching of output voltage occurs for a long time about 150 us the driver needs to refresh its state During refreshment it s prohibited to switch the output As a result if pulse width is more than 150 us or if the distance between two sequential pulses is more than 150 us sometimes switching of the high voltage output may be delayed The delay time is about us Specifications ELECTRICAL SPECIFICATION DAARAARARARAARARMANARAANANARAANANARARNANARARNANARARNANARAANANARAANANARNANANARAANANARNANANARNRNANARARNRNAR ARARNAR RA NRAARARNAAARARARA A AN RAARARNRARRRRARARRARAR ARNRNANARNRNANRRARARARRRRMRARRRANRNRRNANANRRNANRMRRNANANRRAANANARRRNRARRRRNRARRARARAARARARRARRAMRARRRANARARRRMRRNARAMRARRAANAAMAAMM
7. rev 1 05 2015 01 05 QBU BT series Pockels cell driver User Manual Important note please measure the output with symmetrical differential high voltage probe only Measurement made with inappropriate equipment is acommon cause of driver s failure Table of content Talc OF CONTENE eeraa EO T OOOO OT OOOO OOTO OOOO OOTO OON OV OPCW sessen EE E DESID UON erranera E E OEE ET N E E E TEN UE E E E E A E T OA Operations oeseri E A E N O Operations RS 232 interface sesssesesecssesesscecssesesesesesssscsssoeosososososssosssssssssesssesesesssssseessessssesesssssese TCIM GAN TOL CS ss E senevedeasucesiiaopeuinceseetsacenteesueeencese BO CUCU ONS vee cate acate caceeceantesueecnceucesanueouseecaceececaueeuioestqetssosanceupseceauvectsintaestoceeectessistavetescaecesaceezavesecsees PONE IV ANN GG oe coats E gaseauencesvesuannnveeuenunstacseeensenuosesteanas tecacwunveaencsasanuacuowesstacanousmnaesyenttacaets PANU MUM OES sene EE DONS sivas ead r neuen tansy ves Cavsewrecavas A E outs nenwudeinnel EN Output OSCINO STAIN CS acer icdeceesstesecinse ce ce deeseeescce sass E seancuceseneeneeeeeesicee Overview QBU BT series Pockels cell driver produces high voltage pulses with high repetition rates fast risetimes and fast falltimes adjustable voltage amplitude and pulse width 3 gt oS Description Front panel POWER switch turns the driver on off VOLTAGE indicator shows installed voltage in kV units VOLT
8. rt as 100ns SP short pulse option minimal pulse width is as short as 100ns another advantage of short pulse option is a little faster rise and fall times a few ns Examples the most popular modifications QBU BT 6024 LJ 2000 A QBU BT 5020 QBU BT 5020 LJ en ane QBU BT 3012 QBU BT 3012 LJ ay a QBU BT 2008 QBU BT 2008 LJ ans eve Other modifications are available on request QBU BT 4016 QBU BT 4016 LJ oe noe Example QBU BT 6024 LJ RS 232 interface description RS 232 connection parameters 38400 bps 8 data bits 1 stop bit no parity Command format is command data optionally end of line command is character long see list below data is ASCII string of adjusting value end of line symbols are r n or n List of available commands f frequency set frequency repetition rate p pulse width set pulse width in microseconds v voltage set voltage in volts s sync set synchronization type 0 positive pulse 1 negative pulse 2 external synchronization r start 1 stop get all adjusted parameters format frequency pulse width voltage synchronization op mode F get adjusted frequency P get adjusted length V get adjusted voltage T get temperature monitor U get voltage monitor M get both voltage and temperature monitors Q get current version e 0 1 turns on off echoing of symbols in RS 232 turned on
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