B&K Precision 2552-2559 - Manual - Manual (Page 137)

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Separating the Signal from Noise
To reduce random noise in the oscilloscope display, follow these steps:
1) Press the “ACQUIRE” button to display the acquire menu.
2) Press the “Acquisition” option button or turn the “Universal” knob
to select “Average”.
3) Press the “Averages” option button to see the effects of varying
the number of running averages on the waveform display.
Averaging reduces random noise and makes it easier to see the details of a
signal.
Triggering on a Video Signal
Observe the video circuit in a piece of medical equipment and use the video
trigger to obtain a stable display.
Triggering on Video Field
To trigger on the video fields, follow these steps:
1) Press the “TRIGGER MENU” button to see “trigger menu”
2) Press the top option button and select “Video”.
3) Press the “source” option button and select “CH1”.
4) Press the “Sync” option button and select “Odd Field” or “Even
Field”.
5) Press the “Standard” option button and select “NTSC”.
6) Turn the horizontal “Time/Div” knob to see a complete field
across the screen.
7) Turn the vertical “Volts/Div” knob to ensure that the entire video
signal is visible on the screen.
Triggering on Video Lines
To trigger on the video lines, follow these steps:
1. Press the “TRIGGER MENU” button to see the trigger menu.
2. Press the top “option” button and select “Video”