Application Examples
Separating the Sign a l from
Noise
Now you want to a
nalyze the signal shape and ignore the noise. To reduce random
noise in the oscilloscope display, follow these steps:
1. Push the Acquire to see the Acquire Menu.
2. Push the Average option .
3. Push the Averages option to see the e ffects of varying the number of running
averages on the waveform display.
Averaging reduces random noise and makes it easier to see detail in a signal. In
the example below, a ring shows on the rising and falling edges of the signal when
the noise is removed.
Capturing a Single-Shot Signal
The reliability of a reed relay in a piece of equipment has been poor and you need
to investigate the problem. You suspect that the relay contacts arc when the relay
opens. The fastest that you can open and close the relay is about once per minute,
so you need to capture the voltage across the relay as a s ingle-shot acquisition.
To set up for a single-shot acquisition, follow these steps:
1. Turn the horizontal and vertical Scale knobs to the appropriate ranges for
the signal you expect to see.
2. Push the Acquire to see the Acquire Menu.
3. Push the Peak Detect option .
4. Push the Trig Menu to see the Trigger Menu.
5. Push Slope ► Rising.
6. Turn the Trigger Level knob to adjust the trigger level to a voltage midway
between the open and closed voltages of the relay.
7. Push the Single to start the acquisition.
When the relay opens, the oscilloscope triggers and captures the event.
TPS2000B Series Digital Oscilloscope User Manual 51
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