User`s guide

Chapter 5 Optimizing Instrument Settings
5-50 PerSeptive Biosystems
5
5.3.5.2 Vertical Digitizer Settings
This section describes:
• Vertical settings
• Vertical Scale
• Vertical Offset
• Input Bandwidth
Vertical settings The digitizer settings include three vertical parameters that
affect the signal acquired:
• Vertical Scale—Adjusts the dynamic range of the
digitizer scale to accommodate the signal you are
acquiring. For more information, see:
• “Vertical Scale” on page 5-28
• “Vertical Scale” on page 5-50
• Vertical Offset—Applies a Y-Offset to the signal. For
more information, see:
• “Vertical Offset” on page 5-28
• “Vertical Offset” on page 5-52
• Input Bandwidth (not available with Signatec
digitizers)—Reduces higher frequency noise. For more
information, see:
• “Input Bandwidth (not available with Signatec
digitizers)” on page 5-28
• “Input Bandwidth (not available with Signatec
digitizers)” on page 5-53
Vertical Scale A correct Vertical Scale setting ensures optimum vertical
dynamic range for the acquired data (Figure 5-12). If the
Vertical Scale is set incorrectly, the following occurs:
• Too high—Decreases the dynamic range of the data.
• Too low—Truncates the tops of peaks, decreases
observed mass resolution, and distorts the relative
distribution of ion abundances in multicomponent
mixtures.