Specifications

24
Subject to change without notice
Measurements
8 Measurements
There are two different kinds of measurements on signals: cur-
sor measurements and automatic measurements. All results
are stored in a buffer memory which is larger than the display
memory. The QuickView mode delivers all available parameters
of a signal curve. The integrated hardware counter shows the
count results on the selected channel.
8.1 Cursormeasurements
The most frequently used measurement method with an oscil-
loscope is the cursor measurement. The HAMEG concept is
oriented towards the expected results and thus provides not
only one or two but in some modes, three cursors. Cursor
measurements are controlled by the keys: CURSOR MEASURE,
CURSOR MODE, and CURSOR SELECT and the universal knob.
The kind of measurement can be dened in the menu which will
open upon pushing the key CURSOR MEASURE.
Fig. 8.1: Cursor measurements selection menu
As shown above, the selection of the kind of measurement can
be done by pushing the respective soft menu key and selecting
the kind of cursor measurement with the universal knob. The
results will be displayed below the graticule. In order to move
a cursor, select the desired cursor with the CURSOR SELECT
key and position the cursor with the universal knob. The kinds of
measurements are:
VOLTAGE
This mode provides 2 cursors in order to measure 3 different
voltages. The values V
1
and V
2
represent the voltages differences
between the zero base line and the actual positions of the two
cursors on the selected signal curve. ΔV represents the voltage
difference between the cursors.
TIME
This mode provides 2 cursors in order to measure 3 different
times and an equivalent frequency. The values t
1
and t
2
represent
the times between the trigger and the position of the cursors. Δt
represents the time between the cursors.
RATIO X
This mode provides 3 cursors in order to measure ratios in X direc-
tion (e.g. a duty cycle) between the rst and the second and between
the rst and the third cursors. The values will be presented in 4
different formats: oating point, percent, degrees, radians.
RATIO Y
This mode provides 3 cursors in order to measure ratios in Y
direction (e.g. an overshoot) between the rst and the second
and between the rst and the third cursors. The results will be
presented in 2 formats: oating point, percent.
COUNT:
This mode provides 3 cursors in order to count signal crossings
of a level which can be set with the third cursor for a time span as
dened by the distance between the rst and the second cursors.
The result will be presented in 4 different versions: number of
rising and falling level crossings, number of positive and negative
pulses.
PEAK LEVELS
This mode provides 2 cursors in order to measure the minimum
and maximum values of a signal within the time span as dened
by the two cursors. The values Vp- and Vp+ represent the mi-
nimum and maximum values of the voltage. The peak-to-peak
value (Vpp) is equal to the difference between the minimum and
maximum values.
RMS MEAN
This mode provides 2 cursors in order to calculate the rms and
the mean values of a signal between the two cursors.
RISE TIME
This mode provides 2 cursors in order to measure the rise and fall
times between the two cursors.
V MARKER
This mode provides 2 cursors in order to measure two different
voltages and a time span. The values V1 and V2 represent the
voltages between the zero base line and the respective cursor.
ΔV represents the voltage difference between the two cursors. Δt
represents the time difference between them.
The menu item  may be turned on or off with the as-
sociated soft menu keys  and ; the active state is marked by
its blue background. If  was chosen, the cursor measurements
will be executed on the active channel; this allows you to quickly
execute similar measurements on different signals. If  was
selected, measurements will always be performed on the channel
selected in the menu .
By pushing the soft key next to the menu , the selected cursors
will be automatically placed on optimum positions along the signal
curve; this allows very fast and usually optimum placement of the
cursors. As mentioned earlier, the cursors may also be placed
manually with the universal knob after pushing the key CURSOR
SELECT and selecting them. In case the automatic placement
does not function with very complex signals, the cursors can be
brought to a predened starting position by pushing the key next
to the menu . The last menu item allows you to switch the
cursors off by pushing the soft key next to it.
The key CURSOR MODE opens the menu item . This mode
can be turned on or off. If activated, the cursors will „glue to“ the
signal, i.e. they will automatically follow all changes of the position
and scaling controls and also deliver new measurement results. If
this mode is deactivated, the cursors will remain in their positions
irrespective of any repositioning or rescaling of the signals.
8.2 Automeasurements
The HMO2524 series oscilloscopes offer cursor measurements
and additionally automatic measurements. By pushing the key
 in the ANALYZE section of the front panel the
menu will open.