To Next Page

To Previous Page

6 Input/Output

6.2 Input

Remote Command

:INPut:COUPling AC | DC

:INPut:COUPling?

Example

:INP:COUP DC

Dependencies Only appears when RF Input is selected as the Input

Does not appear in models that are always AC coupled. When the SCPI command to set DC coupling

is sent to these models, it generates the error “Illegal parameter value; This model is always AC

coupled” In these models, :INP:COUP? always returns AC

Does not appear in models that are always DC coupled. When the SCPI command to set AC coupling

is sent to these models, it generates the error “Illegal parameter value; This instrument is always DC

coupled” In these models, :INP:COUP? always returns DC

Preset AC on models that support AC coupling

On models that are always DC coupled, such as millimeter wave models (frequency ranges 30 GHz

and above), the preset is DC

State Saved Saved in instrument state

Annunciation When the RF Input is selected, and AC coupling is selected, annunciators appear in the Meas Bar to

that effect:

appears in the settings panel (the row of annunciators across the top of the display) to that effect, as

shown below:

When the RF Input is selected, and DC coupling is in effect, the annunciator changes as shown below:

Note the amber color, which indicates that you should exercise caution when applying a signal to any

DC coupled input (see note above this table for the specific cautions)

On models that support both AC and DC coupling: when DC coupling is selected, a warning condition

message appears in the status line "DC coupled" as shown below:

On models that support both AC and DC coupling: when AC coupling is selected, and any part of the

displayed frequency range is below 10MHz, a warning condition message appears in the status line:

"AC: Accy unspec’d below 10MHz"

In AC coupling mode, you can view signals below the corner frequency of the DC

block, but below a certain frequency the amplitude accuracy is not specified.

The lowest frequency for which specifications apply is:

X-Series Model Lowest Freq for meeting specs when AC

coupled

Lowest Freq for meeting specs when DC

coupled

CXA-503/507 100 kHz n/a

2145 Vector Modulation Analyzer Mode User's &Programmer's Reference

Keysight x-series Programmer's Reference

Other manuals for Keysight x-series