MCA166-USB
6 Technical Data
6.1 MCA166-USB Hardware Specifications
6.1.1 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 1kΩ
● DC coupled, accepting +/-200mV 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 9.5V, 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 (1µs and 2µs)
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 >40µs; screen indicator
allows PZC without scope
7. Pile UP Rejector (PUR)
● settings: OFF and ON
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