B&K Precision 4040B - Manual - Manual (Page 24)

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If there is a DC voltage across the output load, use a
coupling capacitor in series with the load. The time
constant of the coupling capacitor and load must be long
enough to maintain pulse flatness.
Impedance Matching
If the waveform generator is driving a high impedance,
such as a 1 M
Ω input impedance (paralleled by a stated
capacitance) of an oscilloscope vertical input, connect
the transmission line to a 50
Ω attenuator, a 50 Ω
termination and to the oscilloscope input. The attenuator
isolates the input capacitance of the device and
terminates the waveform generator properly.
3.6 MENU Keys
These keys select the main menus for displaying or
changing a parameter, function, or mode.
3.6.1 WAVEFORM Keys
These keys select the waveform output and display the
waveform parameter menu (frequency, amplitude and
offset).