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Gain Range continuously variable from 1 to 3000
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Integral non-linearity < ± 0.025% for 2 µs shaping time
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Unipolar output noise < 4.0 µV rms for gain=100 and < 3.5 µV rms for gain=1000 (@ 3 µs shaping time)
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Bipolar zero cross-over walk < ± 3 ns (@ 50:1 dynamic range, 2 µs shaping time)
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LED indicator for high precision pole-zero cancellation without using oscilloscope
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Active filter networks with wide range of shaping times
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Gated baseline restorer with automatic controls of threshold and restoring rate
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Pile-up rejector and live-time corrector
The CAEN Mod.N968 is a spectroscopy amplifier implemented in a one unit wide NIM module. It accepts the typical outputs generated from either optical feedback or resistor feedback preamplifiers connected with nuclear particle detectors. The output is Quasi-Gaussian with 0 to +10 V output dynamics.
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BNC connector 1-unit wide NIM unit, BNC type coaxial connector (Mod. N968) |
Consult our connectors reference page for technical information.
A front 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 jumpers allow to set a x 0.1 attenuation and a further x 2 amplification, thus extending the gain range to 1 ÷ 3000. The shaping time values are 0.5, 1, 2, 3, 6, 10 µs.
The Pole Zero cancellation is performed via a front panel screw-trimmer. The module features also a Bipolar output (to be used for timing purposes), an advanced Gated Baseline Restorer circuit (with manual or automatic threshold setting) and a Pile Up Rejector which allows to reject piled up events.
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Image
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Name
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Package
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No. of Channels
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Gain
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Coupling
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Shaping
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Input Impedance (Ω)
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Output Rise Time (ns)
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Output Range (V)
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Integral Non- linearity
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Equivalent Input Noise (µV RMS)
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In Conn.
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Out Conn.
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N1168 |
NIM |
16 |
2 ÷ 512 |
DC |
Gaussian type |
50 |
- |
+8 on 1 MΩ |
< ±0.05% (Slow)<br> < ±0.5% (Fast) |
< 40 (Slow)<br> < 120 (Fast) (Gain=100x; 0.2 µs shaping time) |
LEMO |
Strip Header |
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N1068 |
NIM |
16 |
2 ÷ 512 |
DC |
Gaussian type |
50 (SE) <br>110 (Diff.) |
- |
+8 on 1 MΩ |
< ±0.03% (S/D)<br> < ±0.03% (GE) |
< 15 (S/D)<br>< 11 (GE) (Gain=100x, 4 μs shaping time) |
LEMO /Strip Header |
Strip Header |
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N968 |
NIM |
1 |
1 ÷ 3000 |
DC |
semi- Gaussian |
1000 |
- |
10 on 1 MΩ |
< ±0.025% |
< 3.5 (@gain=1000) |
BNC |
BNC |
Technical Specifications
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Packaging |
1-unit wide NIM unit |
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Gain range |
1 ÷ 3000 |
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Pulse shape |
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Integral non linearity |
<± 0.025% from 2 µs shaping time (Measured from 20% to 90% of Full Scale Range) |
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Temperature instability(0 to 50?C) |
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Bipolar crossover walk |
< ±3 ns at 2 µs Ts for 50:1 dynamic range |
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Overload recovery |
Recovers to within 2% of rated output from X300 overload in 2.5 nonoverloaded pulse widths using a gain of 1000 for UNIpolar Output. Same recovery from X1000 overload for BIpolar |
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Spectrum broadening |
Typical: <16% FWHM for a 60Co 1.33 MeV gamma line at 85% of full scale for an incoming count rate of 10^3 to 10^5 counts/s (Unipolar Output, 2-µs shaping) |
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Spectrum shift |
Peak position typical shift: <0.024% for a 60Co 1.33 MeV gamma line at 85% of full scale measured from 10^3 to 10^5 counts/s (Unipolar Output, 2-µs shaping) (T.B.C) |
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Equivalent Noise |
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