Determining pulse width, Bar graph – Fluke 87 V User Manual

Page 38

background image

80 Series V
Users Manual


Determining Pulse Width

For a periodic waveform (its pattern repeats at equal time
intervals), you can determine the amount of time that the
signal is high or low as follows:
1. Measure the signal's frequency.
2. Press


a second time to measure the signal's

duty cycle. Press E to select a measurement of
the signal's positive or negative pulse, refer to
Figure 9.

3. Use the following formula to determine the pulse


Pulse Width = % Duty Cycle



(in seconds)


Bar Graph

The analog bar graph functions like the needle on an
analog meter, but without the overshoot. The bar graph
updates 40 times per second. Because the graph
responds 10 times faster than the digital display, it is
useful for making peak and null adjustments and
observing rapidly changing inputs. The graph is not
shown for capacitance, frequency counter functions,
temperature, or peak min max.
The number of lit segments indicates the measured value
and is relative to the full-scale value of the selected
In the 60 V range, for example, the major divisions on the
scale represent 0, 15, 30, 45, and 60 V. An input of -30 V
lights the negative sign and the segments up to the
middle of the scale.
The bar graph also has a zoom function, as described
under "Zoom Mode".

This manual is related to the following products: