
Appendix I Using the Oscilloscope and Control Stick
I-2 PerSeptive Biosystems
I
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
SCALE
SELECT
Vertical Position Horizontal Position Select Cursor Control
Vertical Scale
Horizontal Scale
Reset Button
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