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Caen 968 Technical Information Manual

Spectroscopy amplifier
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NPO:
00100/03:N968x.MUTx/04
Technical
Information
Manual
Revision n. 4
14 June 2004
MOD. N968
SPECTROSCOPY
AMPLIFIER
MANUAL REV.4

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  • Page 1 Technical Information Manual Revision n. 4 14 June 2004 MOD. N968 SPECTROSCOPY AMPLIFIER MANUAL REV.4 NPO: 00100/03:N968x.MUTx/04...
  • Page 2 User. It is strongly recommended to read thoroughly the CAEN User's Manual before any kind of operation. CAEN reserves the right to change partially or entirely the contents of this Manual at any time and without giving any notice.

  • Page 3: Table Of Contents

    Document type: Title: Revision date: Revision: User's Manual (MUT) Mod. N968 Spectroscopy Amplifier 14/06/2004 TABLE OF CONTENTS GENERAL DESCRIPTION ............................4 ................................4 VERVIEW TECHNICAL SPECIFICATIONS ..........................5 ................................5 ACKAGING ............................5 OWER REQUIREMENTS ............................6 RONT AND BACK PANEL ............................7 RONT PANEL CONTROLS ..............................8 NTERNAL UMPERS ............................9...

  • Page 4: General Description

    Document type: Title: Revision date: Revision: User's Manual (MUT) Mod. N968 Spectroscopy Amplifier 14/06/2004 1. General description Overview The Mod. N968 is a spectroscopy amplifier implemented in a single-width NIM module. It accepts the typical outputs generated from either optical feedback or resistor feedback preamplifiers connected with nuclear particle detectors.

  • Page 5: Technical Specifications

    Document type: Title: Revision date: Revision: User's Manual (MUT) Mod. N968 Spectroscopy Amplifier 14/06/2004 2. Technical specifications Packaging The Model N968 is housed in a single width NIM module. Power requirements Table 2.1: Power requirements +12 V 200mA -12 V +24 V 200 mA -24 V...

  • Page 6: Front And Back Panel

    Document type: Title: Revision date: Revision: User's Manual (MUT) Mod. N968 Spectroscopy Amplifier 14/06/2004 Front and back panel Mod. N968 SPECTROSCOPY AMPLIFIER FINE GAIN 0.5 - 1.5 INPUT BUSY COARSE GAIN 2 µ s 3µs 1µs 6 µ s 0.5µs 10µs SHAPING TIME -12V...

  • Page 7: Front Panel Controls

    Document type: Title: Revision date: Revision: User's Manual (MUT) Mod. N968 Spectroscopy Amplifier 14/06/2004 Front panel controls FINE GAIN: 10-turn precision potentiometer with graduated dial for continuously variable direct-reading gain factor of x0.5 to x1.5. COARSE GAIN: 6-position switch, selects feedback resistors for gain factors of 20, 50, 100, 200, 500, and 1k.

  • Page 8: Internal Jumpers

    Document type: Title: Revision date: Revision: User's Manual (MUT) Mod. N968 Spectroscopy Amplifier 14/06/2004 Internal Jumpers Some settings can be performed via internal jumpers (location is shown in Fig. 2.2). Preamp Gain (sw4): allows to set the input preamplifier stage gain either at x1 or x0.1 PRS Polarity (sw3): allows to configure the module in order to accept on the PRS...

  • Page 9: Front Panel Displays

    Document type: Title: Revision date: Revision: User's Manual (MUT) Mod. N968 Spectroscopy Amplifier 14/06/2004 Front panel displays PZ VISUAL INDICATOR: PZ Visual Indicator leading to high precision adjustment of the pole-zero cancellation, for exact compensation of the decay time preamplifier signal.

  • Page 10: Technical Specification Table

    Document type: Title: Revision date: Revision: User's Manual (MUT) Mod. N968 Spectroscopy Amplifier 14/06/2004 to pile-up. Signals whose peak occurs when the INH signal is active must be thus rejected. BUSY Rear-panel BNC connector with Z <10 Ω provides a +5 V logic pulse for the duration that the input pulse exceeds the baseline restorer discriminator.

  • Page 11: Fig . 2.4: Bi Polar Output Equivalent Rms Noise V S . Shaping Time (T S )

    Document type: Title: Revision date: Revision: User's Manual (MUT) Mod. N968 Spectroscopy Amplifier 14/06/2004 UNIPOLAR OUT Gain=1000 Gain=100 Ts (µs) Fig. 2.3: UNIpolar Output Equivalent RMS Noise Vs. Shaping Time (Ts) BIPOLAR OUT Gain=1000 Gain=100 Ts (µS) Fig. 2.4: BIpolar Output Equivalent RMS Noise Vs. Shaping Time (Ts) NPO: Filename: Number of pages:...

  • Page 12: Functional Description

    Document type: Title: Revision date: Revision: User's Manual (MUT) Mod. N968 Spectroscopy Amplifier 14/06/2004 3. Functional description Shaping determination The proper shaping time constant must be seen as the better compromise in order to match high count rates requirements (which lead to small time constant) and good signal- to-noise ratios (which lead to big values).

  • Page 13: Circuit Description

    Document type: Title: Revision date: Revision: User's Manual (MUT) Mod. N968 Spectroscopy Amplifier 14/06/2004 − a Busy Output, which provides a pulse whose width is equal to the time the input pulse exceeds the BLR discriminator level and is automatically extended by the generation of an Inhibit signal.

  • Page 14: Fig . 3.2: N968 I/Otiming Diagram

    Document type: Title: Revision date: Revision: User's Manual (MUT) Mod. N968 Spectroscopy Amplifier 14/06/2004 The chain is completed by the UNIpolar output stage, the delay circuit and the BIpolar forming and output stage. The fast and slow discriminators thresholds can be set either manually or automatically; in the latter case, a circuit provides the threshold value according to the UNIpolar output noise level.

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