cpu utilization command in powershell

Hi All,

I want to get the CPU Utilization Percentage from my system.

 when i am using this command

  $DateTime =Get-Date-Format G
        $ProcessorPercentage =(Get-WmiObjectWin32_PerfFormattedData_PerfOS_Processor-ComputerName $Server -filter "Name='_Total'").PercentProcessorTimeWrite-Output"$Server $DateTime`: $ProcessorPercentage"

using this script i am  getting some value,But it is not the exact value  same as in  Task Manager Performance Tab.

Can any one help on this..

Regards,

Phani Kumar R.