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1 input Multichannel Analyzer
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Fully computer controlled MCA
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8K ADC, fast conversion time with linearization enhancement circuit
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PHA acquisition mode
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Suitable for HPGe, Nai(Tl), CdTe and other detector technologies
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USB 2.0 communication interface
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Libraries, Demos (C and LabView) and Software tools for Windows and Linux
The Mod. N957 is a 8k Multi-Channel (MCA) with USB port, housed in a 1-unit wide standard NIM module. The multichannel analyzer performs the essential function of collecting the data and producing output, in the form of converted value of input peaks. The managed input pulses are those produced by a standard spectroscopy amplifier: Gaussian, semi-Gaussian or square waves, unipolar (positive) or bipolar, in a range from 0 to 10 V, with a rise time greater than 0.1 µs. The trigger can be made “on signal” (Auto Gate mode) or “external” (External Gate mode). In the first case a discriminator, with a settable threshold, enables the conversion. In the second case, an external gate is fed to the module, via front panel GATE In connector. The input channel has one peak amplitude stretcher, the output of which is digitised by a 13 bit fast (0.8 µs) ADC featuring a sliding scale technique, to improve the differential non-linearity. Converted waveforms are stored into a 64 KSamples buffer memory. The unit hosts an USB2.0 port (also compatible with USB 1.1), which permits a simple control and data-acquisition via PC.
Libraries for Windows and Linux will be provided as well. Future firmware upgrade is possible via USB.
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Compare
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Image
|
Name
|
Package
|
No. of Inputs
|
Resolution (channels)
|
Conversion Time (µs)
|
Full Scale Range (V)
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Multi Event Buffer size
|
Connectors
|
|
|
V1741 |
VME |
64 |
1k, 2k, 4k, 8k, 16k |
0.1 |
4 |
1024 events / ch |
ERNI SMC |
|
|
N6741 |
NIM |
32 |
1k, 2k, 4k, 8k, 16k |
0.1 |
4 |
1024 events / ch |
ERNI SMC |
|
|
V785N |
VME |
16 |
4k |
2.8 |
4 |
32 events / ch |
LEMO |
|
|
V1785 |
VME |
8 |
4k |
2.8 |
4 / 0.5 (Dual) |
32 events / ch |
LEMO |
|
|
V785 |
VME |
32 |
4k |
5.7 |
4/8 |
32 events / ch |
Std. Flat |
|
|
N957 |
NIM |
1 |
8k |
0.8 |
10 |
64k events / ch |
LEMO |
Technical Specifications
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Packaging |
One unit NIM mechanics |
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No. of ADC channels |
1 |
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Resolution |
13 bit (8192 channels – 8064 valid if sliding scale enabled) |
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ADC Conversion time |
0.8 µs |
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Dead Time |
4.8 µs |
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LSB |
1.22 mV |
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Gate |
Signal must occur prior to and must extend for at least 0.2-μs after the peak (in External Gate mode) |
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Differential Non-Linearity |
< 1% |
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Integral Non-Linearity |
< 0.065% |
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Gain Instability |
<+150 ppm/°C |
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USB port |
Compatible with USB 1.1 and USB 2.0; |
|
Maximum transfer rate |
30 Mbyte/s (USB 2.0 Bulk Transaction Protocol); |
|
I/O signals |
NIM/TTL; selected via internal switch |
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Discriminator Threshold |
Software programmable, 0 mV ÷ 500 mV range, 100 steps |
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