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Kentech Instruments PBG7, Руководство пользователя

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with several faults present. The switching elements in these avalanche pulsers generally have a
long life, but their life is finite and therefore it is sensible to switch off the unit or at least not
trigger it when it is not required. It is not possible to write a test routine to find 100% of all
possible faults, so if the unit appears to malfunction, and the procedures below fail to isolate the
problem please contact Kentech Instruments for advice.

There is a facility provided under the Stack Status menu to disable 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 output amplitude. Note this
information is stored in non volatile memory, ie it will be remembered even when ac power is
removed. If the output amplitude appears low please check under the system status menu that
all 86 stacks are enabled.

IMPORTANT

When fitting the output connector ensure that:
i) all six fixing screws are tightened to maintain a low impedance ground connection
ii) the plastic insulating collar and sprung centre contact are fitted
Failure to fit the fixing screws will result in severe RF emission.

Содержание PBG7

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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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