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Technical

Information

Manual

MOD. N968

14 June 2004

Revision n. 4

SPECTROSCOPY

AMPLIFIER

MANUAL REV.4

NPO:
00100/03:N968x.MUTx/04

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Summary of Contents for 968

Page 1: ...Technical Information Manual MOD N968 14 June 2004 Revision n 4 SPECTROSCOPY AMPLIFIER MANUAL REV 4 NPO 00100 03 N968x MUTx 04...

Page 2: ...he User accident or any abnormal conditions or operations CAEN declines all responsibility for damages or injuries caused by an improper use of the Modules due to negligence on behalf of the User It i...

Page 3: ...PANEL DISPLAYS 9 2 7 INPUT OUTPUT CONNECTIONS 9 2 8 TECHNICAL SPECIFICATION TABLE 10 3 FUNCTIONAL DESCRIPTION 12 3 1 SHAPING DETERMINATION 12 3 2 EQUIPMENT FACILITIES 12 3 3 CIRCUIT DESCRIPTION 13 LIS...

Page 4: ...t panel switch allows to select between positive and negative input signals Gain setting can be performed continuously in the 10 1500 range product of Coarse Fine and Superfine Gain Two internal jumpe...

Page 5: ...mplifier 14 06 2004 4 NPO Filename Number of pages Page 00100 03 N968x MUTx 04 N968_REV4 DOC 14 5 2 Technical specifications 2 1 Packaging The Model N968 is housed in a single width NIM module 2 2 Pow...

Page 6: ...OC 14 6 2 3 Front and back panel Fig 2 1 Mod N968 Front and back panel Mod N968 FINE GAIN 0 5 1 5 COARSE GAIN SFG SHAPING TIME POS NEG INPUT DELAY ON OFF DC UNI BI PREAMP OUT INPUT UNI BI CRM BUSY INH...

Page 7: ...switch selects time constants for active pulse shaping filter network from 0 5 1 2 3 6 and 10 s PZ ADJ1 Screwdriver adjustable potentiometer to set the pole zero cancellation to compensate input decay...

Page 8: ...or x0 1 PRS Polarity sw3 allows to configure the module in order to accept on the PRS input either positive or negative pulses If the preamplifier connected to the N968 does not feature the PRS set t...

Page 9: ...0 V Front panel INPUT is provided with a test point RTP Rise Time Protection Rear panel BNC connector TTL signal 50 impedance it is provided by the Multichannel Analyzer MCA to communicate to the ampl...

Page 10: ...Gaussian peaking time 2 4 Ts pulse width at 0 1 level equal to 2 9 times the peaking time Bipolar shape approximate derivative time to crossover 3 Ts Integral non linearity 0 025 2 s shaping time Tem...

Page 11: ...N968x MUTx 04 N968_REV4 DOC 14 11 Fig 2 3 UNIpolar Output Equivalent RMS Noise Vs Shaping Time Ts Fig 2 4 BIpolar Output Equivalent RMS Noise Vs Shaping Time Ts UNIPOLAR OUT 0 1 2 3 4 5 6 7 8 9 0 2 4...

Page 12: ...ents the ADC from converting the piled up events The LTC circuit then generates a system dead time that extends the collection time to compensate for the events lost due to pileup rejection The result...

Page 13: ...ch forms the pulse semi gaussian profile The chain composed by both the amplifying and the shaping stages is configured as gated amplifier in order to compensate the amplifiers thermical drift and off...

Page 14: ...sy output and to provide another CRM pulse In the meantime at the arrival of the second pulse a bistable set by the first pulse produces the Inhibit output The LTC function is also shown in Fig 3 2 af...

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