User`s guide

2 Making Measurements
Measuring Frequency
84 U1273A/U1273AX User’s Guide
Measuring pulse width
1 To measure pulse width, position the rotary switch to one
of the functions allowing frequency measurements shown
in Table 2- 20.
2 Press until the measurements are shown in the
millisecond (ms) unit. Probe the test points, and read the
display.
Figure 2-39 Pulse width display
The pulse width 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.
The pulse width polarity is displayed to the left of the duty
cycle value. indicates a positive pulse width and
indicates a negative pulse width. To change the polarity
being measured, press .
Press to cycle through the frequency, pulse width, and
duty cycle measurements.
Press for more than 1 second to exit the pulse width
measurement function.
NOTE
The pulse width function measures the amount of time a signal is high or
low, as shown in Figure 2-37. It is the time from the middle threshold of the
rising edge to the middle threshold of the next falling edge. The measured
waveform must be periodic; its pattern must repeat at equal time intervals.
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