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Kentech Instruments Ltd.

Notes on the use of

PBG7 pulser system

Serial No.

(special)

It is important to read this manual before operating the

system.

2nd April 2004

Summary of Contents for PBG7

Page 1: ...Kentech Instruments Ltd Notes on the use of PBG7 pulser system Serial No special It is important to read this manual before operating the system 2nd April 2004...

Page 2: ...boratory environment You are warned however that the radiation from the system with an antenna or inappropriate load attached can damage sensitive equipment and corrupt data stored in computer and mic...

Page 3: ...l relevant connectors are in place on the rear panels before applying ac power Do not disconnect the multiway connectors on the rear of the PBG7 45kV output module and PBG7 HV power supply module for...

Page 4: ...ions PBG1 configuration One output signal is taken from the 6kV output on the PBG7 control and trigger module the other four modules are disconnected and not used PBG5 configuration Four output signal...

Page 5: ...on of the delay of the 4 trigger signals in PBG5 configuration to allow beam steering using a 4 element antenna array In PBG7 configuration the delay module is not used and should remain connected via...

Page 6: ...is air cooled and at maximum repetition rate the air cooled system will dissipate approximately 250W of thermal power consequently it requires an adequate and unobstructed flow of clean air RF emissio...

Page 7: ...loscope There are thermal drifts in the delay generator which will stabilise after the pulser has been switched on for 20 minutes The internal trigger generator will only run if the inhibit BNC is sho...

Page 8: ...observed with a high bandwidth oscilloscope This may either be a fast 3GHz single shot type or a sampling type If the output of the pulser is to be used directly or via any passive network it is essen...

Page 9: ...able individual stacks This may be used in certain circumstances to disable faulty stacks that are causing problems It is also permissible to use this facility to disable output stacks to reduce the o...

Page 10: ...the up and down keys to select one of Run Test System status or Stack status then press the right key to execute While the main menu is displayed the serial port is monitored If the P receives a chara...

Page 11: ...stacks is powered up in turn Its voltage is measured and checked to be within acceptable limits This takes a few seconds during this period all keys are ignored Finally a summary of the test is displa...

Page 12: ...card disabled respectively For any given row number and card number there is just one stack in common this number is displayed in brackets after S on line one See Dealing with stack faults for detail...

Page 13: ...ursor to under PBG7 press up down to edit configuration then left to exit Down moves cursor to under Test right displays the test result summary as above The configuration is kept in nonvolatile memor...

Page 14: ...the FAULT flag display Left or Right to toggle the flag Up Yes has no effect The ENABLE flags are stored in battery backed RAM h REMOTE The P will enter REMOTE mode if it receives an ESC character whi...

Page 15: ...e of the enable flag and any test voltages as a of initial value ALLSTATUS cr to give a listing of status information and stack information for all stacks n ENABLE cr to set high the enable flag for s...

Page 16: ...DISABLE DISABLE UNDEFINED ok 42 ENABLE ok 42 STACKSTATUS Stack 42 PBG7 stack 20 Enable 1 Test 100 100 100 ok 42 ENBLE ENBLE UNDEFINED 42 ENABLE ok 42 STACKSTATUS Stack 42 PBG7 stack 20 Enable 0 Test...

Page 17: ...k 18 PBG5 stack 16 Enable 1 Test 100 100 100 Stack 19 PBG5 stack 17 Enable 1 Test 100 100 100 Stack 20 PBG5 stack 18 Enable 1 Test 100 99 100 Stack 21 PBG5 stack 19 Enable 1 Test 100 99 100 Stack 22 P...

Page 18: ...1 Enable 1 Test 100 100 99 Stack 54 PBG7 stack 32 Enable 1 Test 100 100 100 Stack 55 PBG7 stack 33 Enable 1 Test 100 100 100 Stack 56 PBG7 stack 34 Enable 1 Test 100 100 100 Stack 57 PBG7 stack 35 Ena...

Page 19: ...le 1 Test 100 100 100 Stack 78 PBG7 stack 56 Enable 1 Test 100 100 100 Stack 79 PBG7 stack 57 Enable 1 Test 100 100 100 Stack 80 PBG7 stack 58 Enable 1 Test 100 100 100 Stack 81 PBG7 stack 59 Enable 1...

Page 20: ...refers to the global stack number 0 to 85 This is a number used by the microprocessor to identify uniquely every stack Every stack also has a local stack number within its module to assist in fault f...

Page 21: ...ds the end of the manual You can see that in effect in the PBG7 module there are 60 stacks in parallel driving the output Disabling one stack will reduced the output by 1 60th of maximum amplitude The...

Page 22: ...ows of stacks in turn and run pulser again you should find that with one particular row selected the problem disappears Leave this row selected Now with the correct card and correct row selected the n...

Page 23: ...fault it is necessary to isolate stack numbers 2 to 5 manually in turn using the stack status pages If the fault lies within one of these four stacks the PBG5 can still be used on 3 channels but do no...

Page 24: ...nd retaining screws tightened and that power is applied to PBG5 and PBG7 modules Note that if a module is connected to the system control link it must be powered up for the link to operate correctly I...

Page 25: ...open circuit short circuit and arcing loads MTBF approx 10 10 shots Output connector N Outputs Pulse output N type Pretrigger output BNC 10V into 501 2ns risetime leads main output by selectable delay...

Page 26: ...tive External trigger delay inactive Fine rate Varies internal rate by a ratio of 10 1 Coarse delay Varies internal delay in 10ns steps Fine delay Varies internal delay continuously over 15ns Single s...

Page 27: ...x 9 way D type Timing refered to trigger input on the trigger module Trigger input to pulse out delay 52ns direct mode 71ns delay mode Indicators Power Shows that AC power is applied and the unit is s...

Page 28: ...isetime AC power IEC 110 to 240V ac 50 60Hz System control 9 way D type Timing refered to trigger input on the trigger module Trigger input to pulse out delay 62ns direct mode 80ns delay mode Indicato...

Page 29: ...adial 20dB SMA x 2 suicide T x 2 or special Kentech attenuator PBG1 output from PBG7 control and trigger module 10000x attenuation 1kV per division 100ps per division PBG5 channel 1 output using suici...

Page 30: ...channel 2 output using suicide T attenuator 20000x attenuation 2kV per division 100ps per division PBG5 channel 3 output using suicide T attenuator 20000x attenuation 2kV per division 100ps per divis...

Page 31: ...G5 channel 4 output using suicide T attenuator 20000x attenuation 2kV per division 100ps per division PBG7 output using special Kentech attenuator 100000x attenuation 10kV per division 1ns per divisio...

Page 32: ...put using special Kentech attenuator 100000x attenuation 10kV per division 200ps per division PBG7 output using special Kentech attenuator approx 90000x attenuation approx 9kV per division 100ps per d...

Page 33: ...f the cable Strip back the outer and slide back the braid Solder Bind with PTFE tape with silicon rubber RTV Slide connector forward with RTV rubber covering the PTFE Make sure all voids are filled wi...

Page 34: ...d melting the dielectric It is very important that this joint is strong so the earth connection is secure Cover the braid with several layers of heat shrink tubing Slide an additional braid over the c...

Page 35: ...Notes on the use of DEL4 four channel delay generator Serial No xxxxxx 11th March 2004...

Page 36: ...ged whilst the signal is propagating through the device If the delay setting is not changed whilst the pulse is propagating the pulse is limited to 1 8mamp coulombs e g 1 5kv for 2ns 1 5kV is the maxi...

Page 37: ...n two or more output pulse channels This will find such applications as the adjustment of interframe timing in fast framing cameras and triggering or pulse shaping in laser systems Use In manual mode...

Page 38: ...either 1 Edit the entry number press right to edit the entry number using right and left to select the appropriate digit then up or down to increment or decrement 2 Move to delay edit page 1 press do...

Page 39: ...sary one or more times to move the cursor to Delay1 then left to return to delay edit page 1 Note that the changes you make on this page are in volatile memory only and will be lost when you subsequen...

Page 40: ...to n picoseconds range 0 to 20000 n DEL2 cr to set delay 2 to n picoseconds range 0 to 20000 n DEL3 cr to set delay 3 to n picoseconds range 0 to 20000 n DEL4 cr to set delay 4 to n picoseconds range...

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