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BNC DB-2 User Manual

Random pulse generator
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User Manual
Model DB-2
Random Pulse Generator

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Summary of Contents for BNC DB-2

  • Page 1 User Manual Model DB-2 Random Pulse Generator...

  • Page 2: Table Of Contents

    CONTENTS FRONT MATTER Title Page Warranty Contents Lists of Illustrations and Tables SECTION 1 SPECIFICATIONS SECTION 2 OPERA TING INFORMATION 2 - 1 2. 1 Introduction 2 - 1 2. 2 Function of Controls and Connectors 2 - 3 2. 3 Optimum Performance 2.
  • Page 3 Dwg. ILLUSTRATIONS Figure No. � Model DB-2 Random Pulse Generator. Duty Factor Limitation of the Model DB-2. Amplitude, Rate and Fall Time Settings for less than 1 distorted pulses. 4 -1 Block Diagram of the DB-2 Random Pulse Generator. 4- 2 Simplified Schematic of the DB-2 Clock Circuitry.

  • Page 4: Specifications

    Less than ± O. 05% from 10 Hz to 100 kHz. Jitter (resolution): 0,01% RMS. ±0,02%/ 0 Temperature Coefficient: FREQUENCY JITTER (Repetitive Mode): Less than 1 % • EXTERNAL TRIGGER: Requires 1 V positive pulse. Input impedance 1 K. • continued Model DB-2 Page 1-1...

  • Page 6: Opera Ting Information

    �d sin � le-channel analyzers. tector signals while retaining a monoenergetic 2.2 FUNCTION CONTROLS nature. Two or more DB-2's may be connected . & CONNECTORS to a single test point to test over load and pileup response and pulse pair resolution.
  • Page 7 ------------------------------------------ This connector allows the use of an external voltage to EXT REF: control the magnitude of the voltagEl transitions produced by the pulse generator. Page 2 - 2 Model DB-2...

  • Page 8: Termination

    The proper method to test these devices is to The output of the DB-2 should be terminated use the Model DB-2 as a stimulus to either the whenever long (greater than ten feet) system preamp test input or the main (shaping) cables are being used.

  • Page 9: External Triggering

    When placed in the repetitive (REP) MODE, the TIME, and FREQUENCY settings that warrant Model DB-2 will produce one output pulse for· close monitoring of the DB-2 output by an each exl'ernal trigger pulse applied to the EXT oscilloscope. Flattened or saturated traces at TRIG connector.

  • Page 10: External Reference

    When used as a sliding pulser (by connecting a Berkeley Nucleonics Model LG-1 Ramp Gener­ ator to the EXT REF input), the Model DB-2 2. 3. 7 NIM POWER SUPPLY exhibits diff�rential nonlinearity 1 e s s than The Model DB-2 is a NIM module and depends ±0.25% over the top 85% of the amplitude range.

  • Page 11: Detector Simulation

    NaI(Tl) 0.25 µs 0.1 µs). When the DB-2 is used to simulate detectors with very small (less than 0.1 µs) charge collection (or light decay) times, the Intermediate settings of the RISE TIME control...

  • Page 12: Preamplifier Simulation

    3.2 PREAMPLIFIER SIMULATION The system pole - zero compensation is now adjusted while monitoring the data collected on The Model DB-2 can be used to simulate the a multi-channel analyzer until the DB-2 peak is output waveform of a system preamplifier in as narrow as possible.

  • Page 13: Checking Pile-Up Rejectors

    One DB-2 the sum peak will remain; if the interval is too,. is set for Csl events; the other DB-2 is set for Nal events; and their amplitude ratio varied to long, events that would have been correctly analyzed will be lost.

  • Page 16: Theory Of Operation

    4. 5. 1 PERIODIC CLOCK of the Charge Sensitive Amplifier output pulse (Refer to Schematic DB-2-31 in Section 6.) is 10 ms, and the leading edge is- a linear ramp A free - running multivibrator, Ql - Q2, · gen­...

  • Page 17: Random Clock

    4. 5, 2 RANDOM CLOCK Q7 - Q8 and Z4. The output of Z4 (pin 10) (Refer to Schematic DB-2-31 in Section 6.) swings more negative if the voltage of Cl6 is negative. C12 and R24 integrate the Z4 output The base-emitter junction of Q9 is reverse­...
  • Page 20 Power for the digital logic R126, R127) -2. 5 +2. 5 from V to Again, is supplied by from the V input. C69 - C70 the output signal is coupled through The nominal current through is 100 mA. Page Model DB-2...

  • Page 21: Maintenance

    ComJ?arator Plug - In (Tektronix 7504, 7A13, 7B50), 5, 3, 2 SETUP AP-2), Regulated NIM Power Supply (BNC Connect the Model DB - 2 to the NIM power sup­ Shaping Amplifier w i t h Bipolar Output ply via the extender cable. Monitor the output (Tennelec TC211).

  • Page 22: Initial Performance Check

    - MAINTENANCE - ---------------- NOTE ---------------- 5. 3. 3 INITIAL PERFORMANCE CHECK Since there are long time constants in the power to the NIM supply and check Apply circuit, 30 or more seconds should be for 5 V (approximately) output pulses over allowed for circuit settling.

  • Page 23: Output Amplitude (R45)

    AMPLITUDE TEMPERATURE COEFFICIENT Rll8 BUFFE � � :----\ LR75 •-- AMPLIFIER DC OFFSET LOOP OUTPUT DC OFFSET R89�o Rl31 BUFFER lRSl LOOP INPUT AMPLIFIER DC OFFSET EXTERNAL ZERO BIAS INTERCEPT FIG. 5-1. Location of Calibration Trimmers. Page 5-3 Model DB-2...

  • Page 24: External Zero Intercept {R51)

    R45 until the output voltage returns to the ( � 0. 02 %/ ° C). earlier recorded value (room temperature). Place the DB-2 in the laboratory oven and Repeat the temperature test until the TC is set the temperature controller to slightly set to zero.

  • Page 25: Parts List And Schematics

    25 V 120-008 1000 µF elec 15 V 120-018 0, 05 µF 500 V 110-015 1000 µF elec 15 V 120-018 0. 05 µF 500 V 110-015 elec 1000 µF 15 V 120-018 continued Model DB-2 (1/8· Page 6-1...

  • Page 26: Parts List

    - PARTS LIST - CAPACITORS (continued) 1N4742 1N270 1200 pF 10 % 114-031 411-00 2 O. 0022 µF 600 V 10 % 114-003 1N4154 411-00 3 0. 0047 µF 400 V 10 % 114-008 1N4154 411-0 03 0. 01 µF 200 V 114-025 0.
  • Page 28 1/4 W 213-222 MPSA70 430-032 MPSA70 430-032 MPSA70 430-032 MPS5172 430-031 TRANSISTORS MPSA70 430-032 MPS5172 430-031 MPS5172 430-031 MPS5172 430-031 MPS6520 430-033 MPS5172 430-031 MPS6522 430-034 MPSA70 430-032 MPSU52 430-037 MPSA70 430-032 MPSU02 430-036 (1/86) Page 6-4 Model DB-2...
  • Page 29 Contact Us Berkeley Nucleonics Corpora�on Phone: (415) 453-9955 2955 Kerner Blvd. Email: info@berkeleynucleonics.com San Rafael, CA 94901 Web: www.berkeleynucleonics.com Model Type User Manual Document Version Number: 1.0 Print Code: 61020221...

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