User manual
32
Measurements
8 Measurements
There are two different types of measurements on signals:
cursor measurements and automatic measurements. All
measurements are stored in a buffer memory that is larger
than the display memory. The integrated hardware counter
shows the frequency and period duration for the selected
input.
8.1 Cursor Measurements
The measurement option that is most frequently used with
an oscilloscope is the cursor measurement. Depending on
the measurement type up to three markers are available. To
control cursor measurements, you may use the keys CUR-
SOR MEASURE and KEYPAD as well as the universal knob.
The menu CURSOR MEASURE allows you to select cursor-
based measurements for an activated signal source on the
oscilloscope.Themeasurementtypecanbedenedinthe
menu that opens when you press the CURSOR MEASURE
key. Following measurement types can be selected:
VOLTAGE: This mode provides two cursors to
measure three different voltages. The values
V1 and V2 correspond to the voltage between
the zero base line of the selected signal and the current
positionoftherstorsecondcursor.ThevalueΔVcorres-
ponds to the amount of voltage between the two cursors.
TIME: This mode provides two cursors to
measure three different times and an equivalent
frequency. The values t1 and t2 correspond to
the time between the trigger and the current position of
therstorsecondcursor.ThevalueΔtcorrespondstothe
amount of time between the two cursors.
RATIO X: This mode provides three cursors to
measure a ratio in X direction (e.g. a duty ratio)
betweenthersttwocursorsandtherstand
the third cursor. The measurement values are displayed in
fourdifferentformats(oatingpoint,percent,degreesand
radians).
RATIO Y: This mode provides three cursors
to measure a ratio in Y direction (e.g. an
overshoot)betweenthersttwocursorsand
therstandthethirdcursor.Themeasurementvalues
aredisplayedintwodifferentformats(oatingpointand
percent).
COUNT: This mode provides three cursors to
count signal changes that exceed the threshold
withinaspecicinterval.Theintervalmaybe
setbyusingthersttwocursorsandthethreshold may be
set by using the third cursor. The measurement values are
displayed in four different formats (number of rising and
falling slopes and number of positive and negative pulses).
PEAK VALUES: This mode provides two
cursors to measure the minimum and the maxi-
mum voltage of a signal within the interval set
by using both cursors. The values Vp- and Vp+
correspond to the minimum and the maximum voltage.
The peak value (Vpp) corresponds to the amount of vol-
tage between the minimum and maximum value.
RMS, MEAN, STANDARD DEVIATION: This
mode provides two cursors to measure the
effective value (RMS – Root Mean Square), the
mean value and the standard deviation within the interval
set by using both cursors.
DUTY RATIO: This mode provides three
cursors to determine the duty ratio between
the two horizontal cursors. The third cursor is
used to specify the threshold at which the duty ratio is
measured.
RISE TIME 90%: This mode provides two cur-
sorstomeasuretheriseandfalltimeoftherst
rising slope in the displayed view of the screen
within the time span set by the cursors. The rise time iden-
tiesthetimeinwhichthesignalrisesfrom10%to90%of
its amplitude.
RISE TIME 80%: This mode provides two cur-
sorstomeasuretheriseandfalltimeoftherst
rising slope in the displayed view of the screen
within the time span set by the cursors. The rise time iden-
tiesthetimeinwhichthesignalrisesfrom20%to80%
of its amplitude.
V-MARKER: This mode pro-
vides two cursors to measure
three different voltages and
a time. The values V1 and V2 correspond to the voltage
between the zero base line of the selected curve and the
currentpositionoftherstorsecondcursor.ThevalueΔV
corresponds to the amount of voltage between the two
cursors.ThevalueΔtcorrespondstotheamountoftime
between the two cursors.
Fig. 8.1: Selection menu for cursor measurements