Introduction

The software DECAY18 offers the following features:

• Direct display of charge decay observations in real time.
• Recording of decay observations for immediate and / or subsequent analysis, either using software, or using a spreadsheet.
• Recording of analysis for display via a spreadsheet.
• Recording of graphical display of analysis for later printout.
• Application of smoothing to improve resolution where surface charging potentials are very low.
• Current and earlier charge decay observations are analysed in terms of:
  • Time to of initial surface voltage.
  • Time to decay between prescribed levels.
  • Decay time constant values as a function of time.
• Charge decay time and decay time constant values are presented on numerical and graphical displays.
• With instruments made after the end of 1994 facilities are provided:
  • to control charging parameters from the computer.
  • to control up to 99 repeated charge / discharge cycles with identical charge / discharge / data-logging conditions.
  • to control sequences of charge / discharge cycles with predetermined sequence of (possibly repeated) charge / discharge / data-logging conditions.
    
    

Typographical Conventions

In the following text, there are many instructions on computer entry, and instrument switch settings. The following conventions are used:

• Computer Screen Text
  • as generated by computer: A: prompt>
  • as echoed from keyboard: ins
  • to be replaced by text to
    your requirements act
  • as generated by program menu Manual control
• Computer Keys
  • Escape Key
  • Backspace Key
  • Return Key
  • Edit Cursor Movement Keys , , ,
  • Editing Keys ,
  • Menu Selector Bar Keys ,
  • Field Selection Keys , ,
  • Shifted Keys (the first key is to +,
    be held down, while the second +,
    is pressed and released) +
• JCI155v4 Instrument:
  • Switches Discharge
  • Legends Volts

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