Voyager DP-263-S Guía de usuario descargar pdf (Pagina 298)

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Chapter 5 Optimizing Instrument Settings

5-68 PerSeptive Biosystems

Optimizing Delay

Time

NOTE: If you are analyzing a broad mass range and need

optimum resolution in all mass regions, you may need to

acquire smaller portions of the mass range and set the

Delay Time to optimize resolution for each mass range.

To optimize Delay Time:

1. Open a standard .BIC file for the mass range you are

acquiring. For more information, see “Selecting a .BIC

file” on page 5-8.

2. Acquire a spectrum and observe the resolution. For

information, see Section 6.5.2, Calculating Mass

Resolution.

If the resolution is not acceptable, increase the Delay

Time by 100 nsec (Linear mode) or 50 nsec (Reflector

mode), acquire a spectrum and observe. Leave the Grid

Voltage% setting unchanged.

If the signal is saturated at the higher Delay Time

setting, decrease the laser intensity and acquire a new

spectrum. If the signal decreases at the higher Delay

Time setting, increase the laser and acquire a new

spectrum.

Hint: If you are analyzing a mixture and the resolution

of the peak of interest is not acceptable, observe the

resolution of a higher mass peak and a lower mass

peak. If resolution is better on the higher mass peak,

decrease the Delay Time (by 100 nsec for Linear mode or

50 nsec for Reflector mode). If resolution is better on the

lower mass peak, increase the Delay Time (by 100 nsec

for Linear mode or 50 nsec for Reflector mode). Collect a

spectrum and observe. Leave the Grid Voltage% setting

unchanged.

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