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Measuring duty cycle
The duty cycle (or duty factor) of a repetitive pulse train is the ratio of the positive
or negative pulse width to the period expressed as a percentage, as shown in
Figure
The duty-cycle function is optimized for measuring the on or off time of logic and
switching signals. Systems such as electronic fuel injection systems and switching
power supplies are controlled by pulses of varying width, which can be checked
by measuring duty cycle.
1 To measure duty cycle, position the rotary switch on one of the functions
2 Press
Figure 2-40
The duty cycle percentage of the input signal is shown in the primary display. The
voltage or ampere value of the signal is shown in the secondary display. The bar
graph does not indicate duty cycle but indicates the voltage or ampere value of
the input signal.
Keysight U1271A/U1272A User's Guide
for more than 1 second to exit the pulse width measurement function.
Dual
E xit
2-37.
allowing frequency measurements shown in
until the measurements are displayed as a percentage (%). Probe
the test points and read the display.
Duty cycle display
Making Measurements
Figure
2-36.
2
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