Frequency
The Oscilloscope mode Frequency is defined as the inverse of the period (1/period). The measurement can be restricted to a measurement region. Period is a determined by measuring the time between the first detected edge of a waveform and the next occurrence of the same type of edge. The edges are the middle threshold crossings which, by default, are set to the 50% level. Two annotation labels identify the threshold crossings on the waveform. Top-base levels are not used in the frequency calculation when threshold levels are set to absolute voltages. Frequency will not be calculated unless a complete waveform cycle is visible on the display. When measuring an optical channel, the measurement units are Watts.
The detected edges can be either rising or falling. Frequency is determined as follows:
- Rising edge
- Falling edge
Use this measurement on single valued waveforms in oscilloscope mode only.
This measurement is not compatible with PAM4 signals.
Configurable Measurement Parameters
This measurement is affected by the following settings (click Measure > Configure Base Measurements):
- Top-Base Definition tab
- Thresholds tab
To measure
- Select Oscilloscope Mode.
- Click the toolbar's Time tab.
- Click the toolbar's More buttons to locate the Frequency button.
- Click the button.
- If measurement regions are enabled, the Select Measurement Region, Setting dialog is displayed. Select the area over which the measurement is to be performed: a Region or the Entire Display.
SCPI Command
:MEASure:OSCilloscope:FREQuency