Specifications

25
Subject to change without notice
Measurements Measurements
Fig. 8.2: Menu for the automatic measurements settings
This menu offers the selection of two auto measurement
functions:  and  can be switched  or
 with the respective soft menu keys. The associated soft
menus will open selection windows upon pushing the respec-
tive menu key. Each window will present all available kinds of
measurement which can be selected with the universal knob.
The source for the measurements can be selected with the
universal knob after pushing the respective soft menu key.
The listing of available sources will only show the displayed
channels. The results will be displayed in the right bottom
corner of the screen.
The following kinds of measurement are available:
MEAN
In this mode the mean value of the signal will be measured.
With periodic signals only the rst period shown on the left of
the graticule will be measured.
RMS
This mode measures and calculates the rms value of the signal
but only for those portions of the signals which are displayed.
If the signal is periodic, the rst period displayed will be used.
The „true rms“ value will be calculated.
COUNT +
In this mode the number of positive pulses displayed will be
counted. A positive pulse is dened as consisting of a rising
and a falling slope. The switching level will be calculated by
measuring the mean value of the signal. A crossing of this level
only in one direction will not be counted.
COUNT –
In this mode the number of negative pulses displayed will be
counted. A negative pulse is dened as consisting of a falling
and a rising slope. As before, the mean value of the signal will
be measured and used as the trigger level. A crossing of this
level only in one direction will not be counted.
COUNT +/
In this mode positive slopes of the signal within the displayed
area will be counted. As before, the mean value of the signal
will be measured and used as the trigger level.
COUNT-/
In this mode negative slopes of the signal within the displayed
area will be counted. As before, the mean value of the signal
will be measured and used as the trigger level.
PEAK-TO-PEAK
In this mode the voltage difference between the minimum and
maximum values of the displayed signal will be measured.
PEAK +
In this mode the positive peak value of the displayed signal will
be measured.
PEAK –
In this mode the negative peak value of the displayed signal
will be measured.
PERIOD
In this mode the duration of the signal period will be measured.
The period is dened as the time between two identical portions
of a recurring signal.
FREQUENCY
In this mode the signal frequency will be measured as the
reciprocal of the period. Only the rst period will be used. The
measurement pertains only to the selected channel.
RISE TIME
In this mode the rise time of the rst displayed positive slope
will be measured. The rise time is dened as the time span
between 10 to 90 % of the full amplitude.
FALL TIME
In this mode the fall time of the rst displayed negative slope will
be measured. The fall time is dened as the time span between
90 to 10 % of the full amplitude.
TRIGGER FREQ
In this mode the frequency of the trigger signal as the reciprocal
of its period will be measured. The source for this measure-
ment is the actual selected trigger source. The measurement
is performed with a 6 digit hardware counter.
TRIGGER PER.
In this mode the duration of a trigger period is measured with
a hardware counter.