Top/Base Configuration

Meas. mode:

Scope

Eye

TDR

Flex Apps:

FlexDCA

FlexRT

MEASUREMENTS AFFECTED

FlexDCA uses the top/base definitions during these measurements:

Oscilloscope Mode:

Amplitude
Average
Waveform Base
Waveform Top
Duty Cycle
Fall Time
Frequency
Preshoot
Overshoot
Period
+ Pulse Width
− Pulse Width
Rise Time
Δ Time
Time at Edge
Time at Amplitude
RMS
Amplitude at Lower
Amplitude at Middle
Amplitude at Lower
Optical Modulation Amplitude
Jitter

Eye/Mask Mode:

Duty Cycle Distortion
Rise Time
Fall Time

TDR/TDT Mode:

Rise Time
Fall Time

In Oscilloscope, Eye/Mask, and TDR/TDT Modes, a waveform's top and base definitions for measurements can be set proportional to the signal amplitude or set to user-defined values using the :MEASure:TBASe:METHod command. Custom values are specified, depending on waveform source, by the commands listed in the following table.

Commands Used to Enter Top and Base Levels
Waveform Type	Commands
Channels	:CHANnel:UDEFined:BASe :CHANnel:UDEFined:TOP
Differential Waveforms	:DIFF:UDEFined:BASe :DIFF:UDEFined:TOP
Eye Memory	:EMEMory:UDEFined:BASe :EMEMory:UDEFined:TOP
Waveform Memory	:WMEMory:UDEFined:BASe :WMEMory:UDEFined:TOP
Function	:FUNCtion:UDEFined:BASe :FUNCtion:UDEFined:TOP