Velleman PCSU1000 DSO - Manual (Page 4)

PC Oscilloscope PCSU1000 3
© 2005 ... Velleman
1.2 1GS/s oversampling mode
· The 1GS/s sampling rate is in use on blue 0.2us/div, 0.1us/div, 0.05us/div and 0.02us/div
ranges.
· Triggering must be ON to get stable waveform images.
· This mode is useable only for repetitive signals.
· This operation mode is called "Random Interleaved Sampling" (RIS) method, sometimes also
called "Equivalwent Time Sampling" (ET) mode or "Random Repetitive Sampling". In this
sampling mode the oscilloscope uses successive triggering occurrences to gather the data to
construct a picture of a repetitive signal.
1.3 Controls
Spectrum analyzer mode
FREQ. RANGE
Sets the frequency range of the display. It is necessary to slide the screen using X-POSITION in
order to see the full range.
LOG/LIN
To display the frequency on a linear or logarithmic scale.
ZOOM x1, x2, x4, x8
In order to expand the screen X1, X2, X4 or X8
Oscilloscope mode
VOLTS/DIV
Selected value indicates the peak-to-peak voltage required to produce a peak-to-peak deflection of
one major division on the screen
Big Screen
Displays large waveform screen with separate button bar. Use Normal Screen button to return
normal mode.
Note: Big screen is available only in Oscilloscope and Spectrum Analyzer modes.
Coupling
AC: the input signal is capacitive coupled to the input amplifier/attenuator. Only the AC components
are measured.
GND: the input signal is broken and the input amplifier/attenuator is connected to earth. Use this
position for selecting a reference point on the display.
DC: the input signal is directly connected to the input amplifier/attenuator. Both AC and DC voltage
are measured.
Probe x1/x10
Use these buttons to adapt the readouts according to the x1/x10-probe setting.
CH1 On, CH2 On
Buttons turn the display of the trace ON or OFF. To get the cursor measurements of CH2 voltage
values switch CH1 off.