ORTEC Easy-MCS, Hardware User Manual

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Easy-MCS
™
Multichannel Scaler and MCS-32 (A73-B32) Software 931054C / 1213
46
Fig. 31. Input Control Dialog.
Fig. 32. Ramp Control Dialog.
are set with the Lower and Upper slide bars
in the SCA section of the dialog. The nominal
voltage of the levels is displayed to the right of
each slide bar. To change the voltage, point at
the slide button, click and hold the left mouse
button, and drag the mouse to the voltage you
want. To make small adjustments, click the
slide bar to the left or right of the button. To
make super-fine adjustments, click the slide
bar to activate it, then use the <
8
>/<
9
> keys.
The Discriminator input (the BNC connec-
tor labeled IN) accepts pulses that cross the
Dis criminator Voltage. When the Rising
Edge radio button is marked, the discrimi-
nator triggers when the input crosses the dis-
criminator voltage with a positive slope. When the Falling Edge radio button is marked, the
discriminator triggers when the input crosses the discriminator voltage with a negative slope.
The discriminator voltage is set with the slide bar. The nominal voltage of the discriminator
level is displayed to the right of the slide bar. To change the voltage, drag the slide button left or
right. To make fine adjustments, click the slide bar to the left or right of the slide button. To
make super-fine adjustments, click the slide bar to activate it, then use the <
8
>/<
9
> keys. Use
the discriminator threshold to reject noise and smaller-amplitude pulses while counting larger-
amplitude pulses.
6.2.7. Ramp Control...
Ramp control provides an analog waveform synchro-
nized with the MCS sweep. Use the Ramp Control...
command (Fig. 32) to set up the type of waveform
that will be used.
The Style radio buttons determine the type of wave-
form. The Begin-End style generates a “sawtooth”
waveform, while the Begin-Mid-End button gen-
erates a “triangle” waveform.
Several examples of Begin-End and Begin-Mid-
End waveforms are illustrated in Fig. 33.
When the Begin-End Style is selected, you must specify two voltages: the voltage at channel 0
and the voltage at the last channel in the sweep. The dialog displays two slide bars for setting