Document type: Title: Revision date: Revision:
User's Manual (MUT) Mod. N568B/LC 16 Ch Spectroscopy Amplifiers 26/01/2007 4
Filename: Number of pages: Page:
N568B_N568LC_REV4.DOC 37 6
1.DESCRIPTION
1.1 FUNCTIONAL DESCRIPTION
The Model N 568 LC is a 16 CHANNEL SPECTROSCOPY AMPLIFIER implemented in a single-width
NIM module. A “Low Noise1” version, the N568 B2, is also available.
It accepts the typical outputs generated from nuclear particle detectors connected with preamplifiers
having an output signal pulse characterised by a fast rise time and a slow fall time. With 16
independent channels, this unit allows the optimization of cost and size in multi-detector systems.
For each channel the pole-zero cancellation (PZ), the shaping time, the amplification gain and the
output inversion are remotely programmable (by CAMAC, VME, Standard PC or Manual Controller)
via HIGH SPEED CAENET line.
The shaping time can be selected from 0.2 µs to 6 µs. The fine gain and coarse gain ranges allow a
choice accuracy from 0.15 to 480. The working parameter values are automatically stored in a non-
volatile memory. The inputs and the outputs of this module are accessible on the front panel.
A Gaussian Output is provided either with the programmed gain (OUT) or with a further 10x
amplification (XOUT). The Gaussian Output can be set either as inverted or non-inverted.
A COMMON OFFSET can be programmed via CAENET and allows to shift the baseline of the output.
An FOUT output provides a fast amplification for timing purposes (fixed gain factor of 20). A "MUX O"
and a "MUX F" output allow to monitor respectively the output and the fast output of a single channel
selected via CAENET.
Two LEMO 00 connectors are foreseen for the CAENET line and a LED indicates the electrical
condition of the CAENET network. When several modules are connected to the CAENET network,
their identification is obtained by the thumb-wheel switches located on the front panel: up to 99 N 568
B/LC modules are controlled via 50 Ωcoaxial cable at 1 MB transmission speed. Allowed controllers
are the Manual Controller (Mod. A 250), the CAMAC (Mod. C 117 B), the VME (Mod. V 288) or the
Standard PC (Mod. A 303, A303A and A1303) H. S. CAENET Controllers.
The communication between the Host computer system and the HIGH SPEED CAENET controller is
performed via standard functions and cycles (CAMAC and VME systems) or via a standard memory
or I/O mapped mode for a standard PC (for more detailed information see the relevant Technical
Information Manual). The communication protocol and the meaning of the recognized command
codes are always the same, independently from the used controller.
The performances of this module allow operation with scintillation detectors, proportional counters,
semiconductor detectors in different applications.
1Equivalent input noise < 15 µV RMS (Gain=100 and 3 µs shaping time)
2Mod. N568 B Designed in collaboration with the I.N.F.N. MILANO
