Average Profile Scans Program
The front panel/graphical user interface for Average Profile Scans.llb is shown below.
The user first inputs the mass range of interest. The number of data sets, the number of
averages per set, and the number to average are set by the user. For example, to average
three scans, the program would need the inputs shown below: a single data set is being
averaged producing one average of three scans
In the example shown below, after setting the parameters in the front panel, running
the program results in an initial prompt to select a profile mode scan. The mass scale is
extracted from the selected scan. The program then prompts the user to select three files.
The three files are processed to average the intensity values; these values are averaged on
163
Appendix 2
Pulsed Glow Discharge Ionization Circuit
The circuit shown below was built to pulse the glow discharge power supply voltage.
As described in Chapter 4.2.1, the circuit generates a three-state voltage output pulse which
is applied to the external control input of the Ortec 556 power supply. The user controls the
voltage level of each of the three states (zones 1 – 3) using variable resistors. In terms of
timing, the user controls the overall length of the pulse (length II) and the length of the intial,
high voltage, pulse (length I) using variable resistors. The circuit was powered using a +12 V
and a – 5 V power supply. The + 12 volts was down-regulated to + 5 volts where required
164
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