# :MEASure:TBASe:RFALl:TOP

Threshold Definition Commands

- :MEASure:TBASe:GENeral:BASE
- :MEASure:TBASe:GENeral:METHod
- :MEASure:TBASe:GENeral:TOP
- :MEASure:TBASe:RFALl:BASE
- :MEASure:TBASe:RFALl:METHod
- :MEASure:TBASe:RFALl:TOP
- :MEASure:THReshold:EREFerence
- :MEASure:THReshold:GENeral:HYSTeresis
- :MEASure:THReshold:GENeral:LOWer
- :MEASure:THReshold:GENeral:METHod
- :MEASure:THReshold:GENeral:MIDDle
- :MEASure:THReshold:GENeral:PLOWer
- :MEASure:THReshold:GENeral:PMIDdle
- :MEASure:THReshold:GENeral:PUPPer
- :MEASure:THReshold:GENeral:UPPer
- :MEASure:THReshold:PAM:GENeral:HYSTeresis
- :MEASure:THReshold:PAM:GENeral:LMEThod
- :MEASure:THReshold:PAM:GENeral:METHod
- :MEASure:THReshold:PAM:GENeral:PAMLevel:LEVel{N}
- :MEASure:THReshold:PAM:GENeral:THResholds:EYE{N}
- :MEASure:THReshold:PAM:RFALl:LMEThod
- :MEASure:THReshold:PAM:RFALl:METHod
- :MEASure:THReshold:PAM:RFALl:PAMLevel:LEVel{N}
- :MEASure:THReshold:RFALl:LOWer
- :MEASure:THReshold:RFALl:METHod
- :MEASure:THReshold:RFALl:PLOWer
- :MEASure:THReshold:RFALl:PUPPer
- :MEASure:THReshold:RFALl:UPPer

## Command Syntax

    :MEASure:TBASe:RFALl:TOP  <amplitude>

<amplitude> is a double.

## Query Syntax

    :MEASure:TBASe:RFALl:TOP?

## Description

Sets or queries the Rise/Fall threshold's global user-defined top-level setting. The top and base levels are used to locate a waveform's lower and upper percent threshold levels for rise time, fall time, and slew rate measurements. Specify the level in volts or Watts depending on the waveform type. Use `:MEASure:TBASe:RFALl:BASE` to set or query a custom base level.

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

The default setting is 240 mV. The maximum setting is bounded by the highest vertical scale value. The minimum setting is bounded by the lowest vertical scale value. If the Top value is set lower than the Base value (`:MEASure:TBASe:RFALl:BASE`), the Base value will be automatically updated based on the Top value.

## Common Numerical Child Commands

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

## Example Command Sequence

    :MEASure:TBASe:RFALl:METHod ABSolute
    :MEASure:TBASe:RFALl:BASE -125E-3
    :MEASure:TBASe:RFALl:TOP 125E-3