when performing
pulse parameter measurements such as
rise time
or pulse width if multiple pulses are on
the screen of your oscilloscope
which pulse is the measurement performed
on
in this infiniivision oscilloscope
measurement tip video
we'll show you how to perform
measurements on specific
pulses using gated measurements
hi i'm johnny hancock product manager
for keysight's
infiniivision x-series oscilloscopes
let's get started and perform some gated
measurements
which simply means perform measurements
on selective
portions of the waveform so here we have
a series of digital pulses
have they have various widths there's
several pulses
and it looks like a pretty narrow glitch
down here on the bottom now what if we
want to measure
the width of these pulses well let's
turn on
a pulse width measurement and it's
measuring about 300 nanoseconds
now it pops up the markers automatically
and tells you
which pulse it's measuring it's
measuring the one closest
to the time based reference point which
is center screen
if i want to measure this one i could
just slide it to center screen you can
see the measurement
pops over it measures 200 nanoseconds
this one measures 100 nanoseconds
and this one here about 400 nanoseconds
let's put it back about where it was
but there's a better way of doing
selective or gated measurements
and i'm going to show you two different
ways first of all let's turn on the
zoom time base mode and now you see an
expansion
of that particular pulse there now it's
always performing
the measurement on the pulse
that's zoomed in on now again if i want
this
next one i could move my zoom window
over measures that one
measures that one measures that one or
if we
want to go over to this little glitch
over here we can measure that one's
measuring about 40 nanoseconds
now there's another way we could use
uh gated by cursors so
before i go and and move the cursors
around let's go into the measurement
menu
and here's where i can select how to
perform the measurement right now i'm
just using auto select
if only the main time base is on
performs a pulse closest to center
screen
if the zoom time base is on it performs
the pulse that's in the zoom window
but here i can select gated by cursors
now let's turn the zoom window off
and let me adjust my cursors
and let's bring my measurement back up
maybe slide it over here and so it's
measuring the pulse
between the x1 and the x2
time cursor let's
move them
now it's measuring this pulse 200
nanoseconds
that pulse 100 nanoseconds and so on so
you have
two different ways of doing it so which
method is better
making gated measurements in the zoom
window or making
gated measurements by the cursors there
are advantages to each
if you make a gated timing measurement
in the zoom window
you can see the signal more clearly
that's being
measured but with gated by cursors you
have
finer control of the start and stop
arming points of that particular timing
measurement
if you think you might have learned
something in this short video to make
you
more proficient in performing
oscilloscope measurements
i invite you to view our other
infiniivision oscilloscope measurement
tip
videos to learn more about keysight's
infiniivision x-series oscilloscopes
go to the url listed on your screen or
contact one of keysight's authorized
distributors thanks and semper fi