Keysight U1271A - Figure 2-40 Duty Cycle Display; Measuring Duty Cycle

Making Measurements 2
Frequency Test Mode
U1271A/U1272A User’s Guide 105
Press for more than 1 second to exit the pulse width
measurement function.
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 2- 37.
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 allowing frequency measurements shown
in Figure 2- 36.
2 Press until the measurements are displayed as a
percentage (%). Probe the test points and read the
display.
Figure 2-40 Duty cycle display
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.
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Dual
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