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Copyright Information

This manual contains proprietary information; no part of it may be reproduced by any means without prior
written permission of FAST ComTec, Grünwalder Weg 28a, D-82041 Oberhaching, Germany.

Tel: +49 89 665180-0, FAX: +49 89 66518040

mail: [email protected]

The information in this manual describes the hardware and the software as accurately as possible, but is
subject to change without notice.

ComTec GmbH

Содержание 2128N

Страница 1: ...2128N Constant Fraction Discriminator User Manual Copyright FAST ComTec GmbH Gr nwalder Weg 28a D 82041 Oberhaching Germany Version 1 2 May 11 2021...

Страница 2: ...Version 1 0 May 11 2021 2 F ComTec GmbH...

Страница 3: ...ustomer request the module can be modified to accept positive input signals The constant fraction composite signal is formed by the sum of a direct attenuated fraction f 0 4 standard signal path and a...

Страница 4: ...ontpanel three position switch to select constant fraction with slow rise time reject CFRR basic constant fraction CFT or leading edge timing LET modes of operation OUTPUT WIDTH Front panel 22 turn sc...

Страница 5: ...art of it may be reproduced by any means without prior written permission of FAST ComTec Gr nwalder Weg 28a D 82041 Oberhaching Germany Tel 49 89 665180 0 FAX 49 89 66518040 mail info fastcomtec com T...

Страница 6: ...rols connectors and indicators 9 3 1 Front panel 9 4 Operation 10 4 1 General 10 4 2 Laboratory bench tests 10 4 2 1 Input 10 4 2 2 Operating mode 10 4 2 3 Delay cable 11 4 2 4 Walk trim 11 4 2 5 Outp...

Страница 7: ...Table of Figures Fig 3 1 The Front Panel 9 Fig 7 1 The Circuit diagram 14 Fig 7 2 The Board 15 F ComTec GmbH 5...

Страница 8: ...compensation of timing distortions due to both amplitude and rise time variations in the input signal Output signals are generated whenever the the input signal exceeds the selected threshold set by...

Страница 9: ...ve voltage outputs providing 2V into 50 rise time 4 ns width adjustable by front panel trimming potentiometer the width then determines the internal dead time The maximum width should not exceed 300 n...

Страница 10: ...emperature 0 0 C to 50 0 C Range 2 6 Delay cable Typical lengths for fast pulses 0 25 m to 1 m for pulses from slow detectors e g germanium detectors 1 5 m to 4 m For a better determination of the cab...

Страница 11: ...R modes Walk adjust varies zero crossing discriminator adjustment Positive output connectors each supplies a TTL logic signal into a 50 Ohms load Width control sets positive output signal width also s...

Страница 12: ...nd a delayed pulse delay time td external delay cable The derived time mark is theoretically independent of the pulse height of the input signal For a detailed description of the principle see e g D A...

Страница 13: ...adjust potentiometer should be tried in order to find the optimum time resolution When the model 2128N is used with the intended detector time resolution has to be trimmed experimentally by successiv...

Страница 14: ...e is either determined by a RC combination The output of IC7 goes to the clock enable input of a second master slave flip flop IC8 second half of the 10H131 The output of IC8 is converted by the follo...

Страница 15: ...h a fixed output width for the negative output On customer request the width of the negative output can be enlarged within meaningful values regarding internal settings 6 4 Threshold In the standard v...

Страница 16: ...Diagrams 7 Diagrams 7 1 Circuit diagram Fig 7 1 The Circuit diagram 14 F ComTec GmbH...

Страница 17: ...7 2 Board Fig 7 2 The Board F ComTec GmbH 15...

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