Rigol DSG821 - Page 48

RIGOL Chapter 2 Front Panel Operations
2-16 DSG800 User Guide
External Coupling
Press EXT Coup to select "AC" or "DC" coupling and the default is "AC".
 When "AC" is selected: the DC components of the external signal input from the
[EXT MOD IN] connector at the rear panel of the instrument will be blocked
and the AC components can pass through the connector.The external
modulation input port is similar to a high-pass filter which low cutoff frequency
is less than 5 Hz.
 When "DC" is selected: all the AC components and DC components of the
external input signal can pass through the connector.
Note: When "Int" modulation source is selected, this menu is grayed out and
disabled.
Input Impedance
Press Impedance to select "50ohm", "600ohm" or "100kohm ". You can set the
impedance of the [EXT MOD IN] input channel.
Note: When "Int" modulation source is selected, this menu is grayed out and
disabled.
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