HP 54520 Series - Coupling Softkey

CAUTION
See Also
Vertical
Coupling Softkey
Coupling Softkey
The coupling softkey has several selections: dc, dc BW lim (dc bandwidth
limited), ac, ac BW lim (ac bandwidth limited), and ac LF reject (ac
low-frequency reject).
Because the 50 Q selection sinks more current than the 1MQ setting, make
sure you do not exceed the maximum rated input of the channel when
switching from 1MQ to 50 Q.
When dc is selected, 1 MQ and 50 Q dec input impedances are available as
choices for input impedance. When ac is selected, only 1 MQ is available for
input impedance. Bandwidth limit is switchable for both ac and dc coupling.
Bandwidth limit, LF reject, and ac coupling filter both the vertical and trigger
paths.
e dc — The de bandwidth of the scope, which is 500 MHz.
e dc bandwidth limit — Adds a 30 MHz low-pass filter.
e ac — Adds a 10 Hz high-pass filter.
e ac bandwidth limit — Band-pass filter that consists of a 10 Hz high-pass
filter and a 30 MHz low-pass filter.
e LF reject — Adds a 400 Hz, high-pass filter.
"Edge Trigger Mode" in chapter 5 for information about ac coupling or
adding LF reject to the trigger path separately from the vertical path.