# :MEASure:FFT:FDFRequency:FDPFirst

FFT Delta Frequency Commands

- :MEASure:FFT:FDFRequency
- :MEASure:FFT:FDFRequency:FAVorite
- :MEASure:FFT:FDFRequency:FDPFirst
- :MEASure:FFT:FDFRequency:FDPSecond
- :MEASure:FFT:FDFRequency:FPLevel
- :MEASure:FFT:FDFRequency:LOCation?
- :MEASure:FFT:FDFRequency:SOURce
- :MEASure:FFT:FDFRequency:STATus?
- :MEASure:FFT:FDFRequency:STATus:DETails?
- :MEASure:FFT:FDFRequency:STATus:REASon?

## Command Syntax

    :MEASure:FFT:FDFRequency:FDPFirst <peak_number>

<peak_number> is an integer.

## Query Syntax

    :MEASure:FFT:FDFRequency:FDPFirst?

## Description

This command selects the first frequency peak number to be used in the FFT Delta Frequency measurement (`:MEASure:FFT:FDFRequency`).