B&K Precision 2532B - Manual - Manual (Page 36)

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Take the CH1 for example; the tested signal is a sine wave
signal with DC deflection:
• Press“CH1”→“Coupling”→“AC”, Set to AC couple mode.
This will block the DC component of the input signal.
Figure 15 - AC Coupling
• Press“CH1”→“Coupling”→“DC”, Set to DC couple mode.
Both DC and AC components of the input signal will be
captured.