932502G / 0618 4, 5. MCB PROPERTIES IN MAESTRO
is rejecting the marked pulses.
NegBLDisc This shows when the negative baseline discriminator has been triggered.
Typically this signal only marks the TRP reset pulse. The signal is used
internally in the live-time correction, baseline restoration, and pileup
rejection circuits.
BaseLineR This shows when the baseline restorer is actively restoring the baseline.
PosBLDisc This shows when the positive baseline discriminator has been triggered. The
signal is used internally in the live-time correction, baseline restoration, and
pileup rejection circuits.
Busy When the DSPEC 50 busy signal is active, Busy shows in the Mark box. It
represents the dead time.
Gate This shows when the gate signal is present on the gate input connector. If
the Gate mode on the ADC tab (see Fig. 38, 39) is set to Off, then all
regions are marked. If the mode is set to Coincidence, then the marked
region must overlap the pulse peak (that is, must start before the beginning
of the flattop and stop after the end of the flattop) for the pulse to be
counted. If the mode is set to Anticoincidence, then the marked region will
show the pulses that are accepted. That is, the rejected peaks will not be
marked. Simply put, in all modes the accepted peaks are marked.
Peak This is the peak detect pulse. It indicates when the peak detect circuit has
detected a valid pulse. The Mark occurs about 1.5 ìs after the pulse
maximum on the display.
On the lower right of the InSight display are the shaping parameter controls. The controls are
split into two groups, and the other controls... button switches between them.
One group includes Rise Time, Flattop, Tilt, and the Optimize button. The Rise Time value
is for both the rise and fall times; thus, changing the rise time spreads or narrows the quasi-
trapezoid symmetrically.
The Flattop controls adjust the top of the quasi-trapezoid. The Width adjusts the extent of the
flattop (from 0.3 to 2.4 ìs). The Tilt adjustment varies the “flatness” of this section slightly.
The Tilt can be positive or negative. Choosing a positive value results in a flattop that slopes
downward; choosing a negative value gives an upward slope. Alternatively, Optimize can set
the tilt value automatically. This value is normally the best for resolution, but it can be changed
45
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