Voyager DP-263-S Guide de l'utilisateur télécharger pdf (Page 554)

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Appendix I Using the Oscilloscope and Control Stick

I-2 PerSeptive Biosystems

Oscilloscope

overview

An external oscilloscope (instead of the internal digitizer board

or the LeCroy digitizer) is available as an option on Voyager

systems. The available oscilloscope options include a

500 MHz, 2 GHz, or 4 GHz models.

The oscilloscope converts the signal from the mass

spectrometer to a signal that the computer can use. The

oscilloscope has its own screen to display the averaged ion

signal in real-time. For instrument configurations containing an

oscilloscope, the software does not refresh the spectrum view

until averaging is finished. Unlike the “real-time” update in the

spectrum view, the oscilloscope screen displays the detector

signal on a time scale and the signal is inverted on the screen.

Following acquisition, the signal is inverted and calibrated onto

the mass scale in the spectrum view.

Figure I-1 shows the front panel of the oscilloscope. Only the

knobs you use to adjust the signal while acquiring spectra are

labeled. Other knobs are not used for general operation.

Figure I-1 Front Panel of Oscilloscope

PB100276

VERTICAL

POSITION

HORIZONTAL

POSITION

SCALE

SELECT

Vertical Position Horizontal Position Select Cursor Control

Vertical Scale

Horizontal Scale

Reset Button

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