User manual

Digital Storage Oscilloscope 48
displayed next to the trademark logo in the status line at the top of the display. To start
acquiring data, press [Run/Stop].
To capture and display a single acquisition (whether the oscilloscope is running or
stopped), press [Single] button. The Single run control lets you view single-shot events
without subsequent waveform data overwriting the display. Use Single when you want
maximum memory depth for pan and zoom.
When [Single] is pressed the display is cleared, the trigger mode is temporarily set to
Normal (to keep the oscilloscope from auto-triggering immediately), the trigger circuitry
is armed, the Single key is illuminated, and the oscilloscope waits until a user defined
trigger condition occurs before it displays a waveform.
When the oscilloscope triggers, the single acquisition is displayed and the oscilloscope
is stopped (the [Run/Stop] button is illuminated in red). Press [Single] button again to
acquire another waveform.
When you acquire an analog signal, the oscilloscope will convert it into a digital one.
The real-time acquisition has four modes: Normal, Peak Detect, Average and High
Resolution. The acquisition rate is affected by the setting of time base.
Normal: In this acquisition mode, the oscilloscope samples the signal in evenly spaced
intervals to establish the waveform. This mode accurately represents signals in most
time. However, it does not acquire rapid variations in the analog signal that may occur
between two samples, which can result in aliasing and may cause narrow pulses to be
missed. In such cases, you should use the Peak Detect mode to acquire data.
Peak Detect: In this acquisition mode, the oscilloscope gets the maximum and
minimum values of the input signal over each sample interval and uses these values to
display the waveform. In this way, the oscilloscope can acquire and display those
narrow pulses that may have otherwise been missed in Normal mode. However, noise
will appear to be higher in this mode.
Average: In this acquisition mode, the oscilloscope acquires several waveforms,
averages them, and displays the resulting waveform. You can use this mode to reduce
random noise.
High Resolution(HR): This mode uses a kind of ultra-sample technique to average the
neighboring points of the sample waveform to reduce the random noise on the input
signal and generate much smoother waveforms on the screen. This is generally used