# :FUNCtion:EYE:WINDow:LEFT

:FUNCtion EYE Commands

- :FUNCtion EYE Commands
- :FUNCtion:EYE:BITS
- :FUNCtion:EYE:CCOunt
- :FUNCtion:EYE:CURSor
- :FUNCtion:EYE:CWINdow
- :FUNCtion:EYE:DISPlay
- :FUNCtion:EYE:PATTern
- :FUNCtion:EYE:UIXPosition
- :FUNCtion:EYE:UIXRange
- :FUNCtion:EYE:UUNits
- :FUNCtion:EYE:WINDow:COPY
- :FUNCtion:EYE:WINDow:LEFT
- :FUNCtion:EYE:WINDow:METHod
- :FUNCtion:EYE:WINDow:RIGHt
- :FUNCtion:EYE:WINDow:TRACking
- :FUNCtion:EYE:WINDow:WIDTh
- :FUNCtion:EYE:XPOSition
- :FUNCtion:EYE:XSCale

## Command Syntax

    :FUNCtionN:EYE:WINDow:LEFT  <percent>

Where N identifies one of sixty four {1:64} math functions that you can create. For example, `:FUNCtion2`.

<percent> is a double.

## Query Syntax

    :FUNCtionN:EYE:WINDow:LEFT?

## Description

When the "Eye Opening" eye window determination method is selected (see `:FUNCtion:EYE:WINDow:METHod`), this command sets the percentage of the symbol period (time) for the eye window's left side. This setting determines what portion of the eye diagram is used to generate histograms for eye diagram amplitude measurements.

The default values of 40% (left) and 60% (right) which identifies the central 20% of symbol period.

To set the eye window's right side, use the `:FUNCtion:EYE:WINDow:RIGHt` command.

This command is equivalent to the settings in the Eye tab of the Configure Measurements dialog box.