6.1.2ADC

1.Successive approximation ADC with sliding scale linearisation

Channel splitting 128, 256, 512, 1K, 2K, or 4K

Full input voltage range 3V, positive and negative (10V with external attenuator)

2.ADC Dead time (including time needed to write into memory)

< 8 µsec

3.Nonlinearities

Differential nonlinearity (over 95% channel range) <2%

Integral nonlinearity (over 95% channel range) <0.1%

4.Peak capturing

Works with pulse of gaussian shaping amplifier (range of shaping time constant between 0.5µs and 5µs)

5.Temperature Stability

TK 100 (ADC), TK 500 (Amplifier)

6.Discriminators and threshold

Digital LLD and ULD (allows channelwise cutting)

Analogue threshold (2...60% of ADC range)

Multi Channel Scaling (MCS) mode allowing to count the following pulses

TTL input pulses (minimum width of flat top 0.2µs) not routed through the ADC (maximum rate 1 MHz)

LLD/ULD counting mode, counting pulses within a preset digital window

Count rate derived from internal amplifier ICR signal (maximum count rate determined by count rate limitation of amplifier )

Dwell time 0.01s to 500s

7.Spectrometric performance:

Resolution (FWHM) for typical 500mm² planar HPGe detector for count rates < 10000cps and a Co-57 source at 122keV:

610±20eV at 1µs shaping time

580±20eV at 2µs shaping time

Peak shift:

< 0.5% for 1µs shaping time and count rates from 1000 to 70000cps

< 0.2% for 2µs shaping time and count rates from 1000 to 40000cps

deterioration of FWHM < 5% for both conditions

Throughput in memory:

at least 25000cps in memory at 50000cps input rate and 1µs shaping time

at least 13000cps in memory at 30000cps input rate and 2µs shaping time

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Braun MCA166-USB user manual 2 ADC

MCA166-USB specifications

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