A number of scalar measurements which DVM automatically makes require knowledge of the actual switching frequency of the converter. In particular, the test objectives listed below measure the output voltage and current at the end of the simulation time. These in-regulation measurements require DVM to know the actual converter switching frequency and without this information, the in-regulation measurements are not made. For this reason, a special curve name, DVM Frequency, has been reserved for DVM to find the switching frequency.
When preparing the schematic for simulation, DVM searches for any probe, regardless of type, with a curve label of DVM Frequency. If that curve is found, DVM adds a fixed probe measurement to that probe. Shown below are these results:
The frequency is measured over the last full switching period present in the simulation, taken from rising-edge to rising-edge of the DVM Frequency waveform. The cursors in the graph image below show the time interval over which the frequency is measured.