GBS Elektronik MCA 166 - Manual (Page 47)

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47
4 Technical Data
4. 1. Mini MCA (MCA 166) Hardware Specifications
4.1.1 Amplifier:
1. Type
•
Gaussian programmable shaping amplifier with pile-up rejector and gated base line
restorer
2. Gain
•
From 1 ... 1000
• Minimum gain step 0.5 channel for 2K scale
• Gain tuning under visual control of spectrum
• Gain adjustment by peak stabilizer
• Integral linearity of amplifier <0.1% for full output range
3. Input
•
accepts positive and negative preamplifier signals
• input resistance 1 kOhm
• DC coupled, accepting +/-200 mV DC levels
• maximum input signal corresponding to full ADC scale at minimum gain:
+/-3V (+/-10V with external attenuator) and input set to direct input. With input set to
amplifier the maximum voltage step from preamplifier corresponding to ADC full scale at
gain 1 is 9.5 V, corresponding to a peak voltage at the test point of 2.2V.
4. Pulse shaping
• active integrator and single, pole zero compensated differentiator with two shaping
time constants (1 and 2 µsec)
5. Base line restorer (BLR)
•
Active, gated Base Line Restorer
6. Pole Zero Cancellation (PZC)
•
settings: automated by MCA software and manual setting option
• designed for decay time of the preamplifier pulses >40 µsec ; screen indicator
allows PZC without scope
7. Pile UP Rejector (PUR)
•
settings: OFF and ON
4.1.2. ADC
1. Successive approximation ADC with sliding scale liniarization
•
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