# :CHANnel:THReshold:RFALl:BASE

:CHANnel Threshold Commands

- :CHANnel:TBASe:GENeral:METHod
- :CHANnel:TBASe:RFALl:METHod
- :CHANnel:THReshold:GENeral:AUTO
- :CHANnel:THReshold:GENeral:BASE
- :CHANnel:THReshold:GENeral:COPY
- :CHANnel:THReshold:GENeral:HYSTeresis
- :CHANnel:THReshold:GENeral:LOWer
- :CHANnel:THReshold:GENeral:METHod
- :CHANnel:THReshold:GENeral:MIDDle
- :CHANnel:THReshold:GENeral:PAM:ASLevels
- :CHANnel:THReshold:GENeral:PAM:ASTHresholds
- :CHANnel:THReshold:GENeral:PAM:PAMLevel:LEVel
- :CHANnel:THReshold:GENeral:PAM:THResholds:EYE
- :CHANnel:THReshold:GENeral:PLOWer
- :CHANnel:THReshold:GENeral:PMIDdle
- :CHANnel:THReshold:GENeral:PUPPer
- :CHANnel:THReshold:GENeral:STZero
- :CHANnel:THReshold:GENeral:TOP
- :CHANnel:THReshold:GENeral:TRACking
- :CHANnel:THReshold:GENeral:UPPer
- :CHANnel:THReshold:RFALl:BASE
- :CHANnel:THReshold:RFALl:COPY
- :CHANnel:THReshold:RFALl:LOWer
- :CHANnel:THReshold:RFALl:METHod
- :CHANnel:THReshold:RFALl:PAM:ASLevels
- :CHANnel:THReshold:RFALl:PAM:PAMLevel:LEVel
- :CHANnel:THReshold:RFALl:PLOWer
- :CHANnel:THReshold:RFALl:PUPPer
- :CHANnel:THReshold:RFALl:TOP
- :CHANnel:THReshold:RFALl:TRACking
- :CHANnel:THReshold:RFALl:UPPer

## Command Syntax

    :CHANnelN:THReshold:RFALl:BASE<amplitude>

<amplitude> is a double.

Where N identifies a specific channel in the form "<connection1-8>_<ch1-8>". With connection 1, the connection number part (that is, "1_") is optional, and you can simply use the channel number "<ch1-8>". For example, connection 4 channel 2 is `CHANnel4_2`.

## Query Syntax

    :CHANnelN:THReshold:RFALl:BASE?

## Description

For the indicated channel, sets or queries the Rise/Fall threshold's custom base-level setting. The top and base levels are used to locate a waveform's lower and upper threshold levels for rise time, fall time, and slew rate measurements. Specify the level in volts or Watts depending on the waveform type. Use `:CHANnel:THReshold:RFALl:TOP` to set or query a custom top level.

Before this user-defined base level can be applied to measurements, use the `:CHANnel:TBASe:RFALl:METHod` command to select user-defined top-base definitions.

The default setting is -240 mV. The maximum setting can be 429 mv, but is bounded by the top level (`:CHANnel:THReshold:RFALl:TOP`). The minimum setting is -429 mV.

## Common Numerical Child Commands

This command supports the use of the following common numerical child commands: `:DEFault`, `:MAXimum`, `:MINimum`, and `:STEP`.

## Example Command Sequence

    :CHANnel1_2:THReshold:RFALl:TRACking OFF
    :CHANnel1_2:TBASe:RFALl:METHod ABSolute
    :CHANnel1_2:THReshold:RFALl:BASE -125E-3
    :CHANnel1_2:THReshold:RFALl:TOP 125E-3