LFR is one of auto measurement types of a digital oscilloscope in the time domain (“Delay” menu item) which is used for the measurement of the time delay between the first falling edge of channel 1 and the last rising edge of channel 2.
For more convenient display of a measured parameter the majority of oscilloscope auto measurement types are shown as abbreviations. Such short names contain the encoded meaning of the current auto measurement type. LFR abbreviation can be decoded as Last Falling Rising.
The example of the auto measurement of LFR delay time of Aktakom AOC-5302 wide screen oscilloscope is shown on the screenshot below.
The measured delay time (t) between the first falling edge of channel 1 and the last rising edge of channel 2 on the screenshot above is 1.28 µs.
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