Fluke Oscilloscope Calibration Manual page 31

Position 2
Oscilloscope Calibration Techniques
nd Edge on 2 nd graticule line
Period measurement readout
Deviation of 10 th rising edge
at 10 th graticule line shows error: -1%
Scopes with dual (delayed)
timebases require
calibration of both
timebases and delay
function
Triangle waveform signals used
for analog scopes. Square and
pulse waveforms avoid edge
sampling problems on DSOs.