QBU-BT Driver Manual.. - Electro Optical Components, Inc.
Contents
1. lus 100 ns in LJ modification from overheating 2 environment SE 0 40 Co 20 460 C 90 non condensing 10 90 level warranted at load capacitance 23 pF and below 2000 i MECHANICAL SPECIFICATION _ Size LxWxH 225x200x60mm Weight 1 5 ke OUTLINE DIMENSIONS Performance For continuous operation in internal synchronization modes pulses up and pulses down modes we warrant the performance table as follows 18 14 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 Part numbers QBU BT 6024 6000 2400 QBU BT 5020 5000 2000 QBU BT 4016 4000 1600 QBU BT 3012 3000 1200 Options e LJ low jitter and low delay time modification e RS232 additional input to control module via RS 232 interface Example QBU BT 4016 RS232 Options LOW JITTER AND LOW DELAY TIME MODIFICATION Standard modules have pulse delay time about 1 us jitter about 10 ns Low jitter modification greatly decreases these parameters delay time is decreased to 100 ns jitter to 1 ns RS 232 INTERFACE RS 232 connection parameters 38400 bps 8 data bits 1 stop bit no parity Command format is2. command data optionally end of line e command is character long see list below e datais ASCH string of adjusting value e end of line symbols are r n or n List of available commands e f frequency set frequency repetition rate e p pulse width set pulse width in microseconds e v voltage set voltage in volts e s sync set synchronization type 0 positive pulse 1 negative pulse 2 external synchronization r Start e i 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 by default Example v 2500 sets voltage to 2500 volts Output oscillogrames Chi Width crossing Ch1 Rise 26 93nSs Chi Fall eS No valid edge Chi High 3 03kV 840 V Ch IK 16 Oct 2008 14 12 20 Ch 1S aa M20 0ns A Chl is 20 40 Chi Wwidth crossing chi Rise 40 53ns Ch1 Fall See No valid edge Ch1 High 2 94kV A chil f 840V Chi 16 Oct 2008 16 50 14 Ch IK M 20 0ns 500 Y us 20 40 Capacitance load 77 pF Risetime falltime 40ns el Du M 20 0ns ts 20 40 Ml 20 0ns is 20 40 A Chi X E Chi Chi Width a ea
3. No J ref crossing Ch1 Rise No valid edge Ch1 Fall 24 69nS Ch1 High 2 56kV 840 V 16 Oct 2008 IEAPHEY Chi Width crossing Ch1 Rise No valid edge Chi Fall 40 33ns Ch1 High 2 57kVY 840 V 16 Oct 2008 16 30 46
4. Electro Optical Components Inc 5460 Skylane Boulevard Santa Rosa CA 95403 Toll Free 855 EOC 6300 www eoc inc com info eoc inc com Click to go to Product Selector rev 1 01 2010 07 02 QBU BT series Pockels cell driver User Manual Table of content TAG OP CONTENE sat cc ea op cans ce E E E E E se suesusnmetencestuoneensatweadcoees EE RT d UO EE SEY a E E E ODEIO EE Operations RS 232 Te E ACO cag sansa scnsmnrsstnnconssancaccoeessaecesesenscoasnas yscacemoenoanesnseaeveseasonescoesesbeecoceuieosseees Tue DEE LTE PEO ET Let Cassar eres E was uemenecensen vase snusaneeeswoeiacid seueimnadesuneacunccaeat Part MUMDET S eege ODLO EE GIERENS 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 QBS S C Description Front panel POWER switch turns the driver on off VOLTAGE indicator shows installed voltage in kV units VOLTAGE 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 swi
5. by applying 2kV to positive output wire and 2kV to negative see figure 2kV 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 aresult 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 1 us Specifications ELECTRICAL SPECIFICATION Input 110 230 VAC 50 60 Hz 1 0 A max Output JE Ju push up scheme pull down scheme Working modes Risetime falltime Jitter Protections Operation Temperature e Storage Temperature Humidity high level is adjustable repetition of external signal mode Pulses up mode pulses down mode repetition of external signal mode external synchronization mode Pulse amplitude see Part numbers section Pulse basement _ Pulse width 1 us 1 f f is repetition rate in Hz in internal synchronization modes 20 ms 10ns 4 In ns in n LJ modification Delay time adjustable in HVmin Hvmax range fixed 0 V 1 us DC in external synchronization mode see Performance section
6. onnect 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 a 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 iA B WN Kc 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 66 99 Send to the driver r command to start operations 66599 Send to the driver 1 command to stop operations 7 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 e Module s output is bipolar It means that 4kV pulse is physically formed
7. tches the module between three modes e pulses up when this mode is selected normal state of the output is OV during the pulse output voltage is switched to high voltage when this mode is selected green LED nearby the JL 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 H sign is 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 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 e 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 c
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