Spectrum Techniques ICS-PCI, User Manual

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9
Pulse Height Analysis (PHA) - Direct In
PHA Direct In - Similar to the 'PHA PreAmp In' operating mode except that the incoming signal bypasses both the
card's internal Pre-Amplifier and Amplifier stages.
The amplitude of each detector pulse is measured by the ADC and stored as an amplitude (energy) spectrum.
Multichannel Scaling (MCS Internal)
Multichannel Scaling - This mode is used for measuring time related phenomena such as half-life decay or single photon
counting. Incoming events are counted for specific predetermined times (dwell time) and stored in sequential memory
locations. The card is factory set with the internal preamplifier/amplifier enabled for counting events directly from a NaI(Tl)
detector. In the 'MCS Internal' mode, the signal is routed through the card's amplifiers.
Multichannel Scaling (MCS) - External
MCS External - This mode is used for measuring time related phenomena such as half-life decay or single photon
counting. Incoming events are counted for specific predetermined times (dwell time) and stored in sequential memory
locations. In the 'MCS External' mode, the internal preamplifier and amplifier is bypassed and the signal is routed directly
to the counter.