29
Measurements
tes without voltage reference are displayed here. If “?” is dis-
played, the display does not show a complete measurement
result. For instance, the period to be measured may not
display completely and can consequently not be identified.
If the function AUTOM. SOURCE is activated (ON), the
currently targeted channel will be used as source for the
measurement automatically. If the setting is deactivated
(OFF), the channel set under SOURCE will be applied
even if it is not targeted. Pressing the soft menu key SET
TO TRACE places the selected cursors in their optimal
position on the signal curve. This allows very fast and
typically optimal automatic positioning of the cursors. For
the most part, only fine tuning is required at this point
and the tedious major adjustments to the cursors will no
longer be necessary. In case the automated function SET
TO TRACE does not provide the anticipated results due
to complex signals, you can press the key SET TO TRACE
to position the cursors in a predefined starting position.
This allows you to return distant cursors to the screen.
The soft menu key GLUE TO TRACE allows cursors to stay
on the selected data point without changing the position
in the measurement signal even if the scaling is modified
(cursors will be „glued“ to the signal). This function can be
activated or deactivated. If this mode is deactivated, the
cursor stays in position on the screen if scaling occurs.
With GLUE TO TRACE deactivated, the measured value
changes while it remains unmodified when the mode is
activated.
The cursors will be deactivated by pressing the CURSOR
MEASURE key. The cursor menu will be closed.
8 .2 Automatic Measurements
The R&S®HMO1002 resp. R&S®HMO1202 series features
cursor measurements and also various automatic mea-
surements. These may be activated by pressing the key
AUTO MEASURE
11
in the section ANALYZE. This menu
allows you to select up to six automatic measurement
functions by using the soft menu key MEAS. PLACE and
the universal knob in the CURSOR/MENU section. Fol-
lowing automatic measurement types can be selected:
Fig. 8.1: Cursor measurement setting menu
MEAN VALUE:
This mode measures the
mean value of the signal amplitude (Mean). If
the signal is periodic, the first
period on the
left of the screen will be used for the measurement. The
measurement will only be applied to the selected channel.
RMS VALUE:
This mode identifies the effec
-
tive value from the displayed view of the signal.
If the signal is periodic, the first
period on the
left of the screen will be used for the measurement. The
effective value is not applied to a sine signal will be calcu-
lated directly (so-called TrueRMS). The measurement will
only be applied to the selected channel.
PEAK-PEAK:
This mode measures the diffe-
rence in voltage between the maximum and
the minimum peak value of the signal within
the displayed view (V
pp
).
PEAK + :
This mode measures the maximum
voltage value in the displayed view of the
screen. The measurement will only be applied
to the selected channel (V
p+
).
PEAK – :
This mode measures the minimum
voltage value in the displayed view of the
screen. The measurement will only be applied
to the selected channel (V
p-
).
FREQUENCY:
This mode identifies the fre
-
quency of the signal from the reci-procal value
of the first signal
period T (f). The measurement
will only be applied to the selected channel.
PERIOD:
This mode measures the duration of
the signal period T. The
period identifies the
duration between two equal values of one peri-
odically repeated signal.
AMPLITUDE:
This mode measures the am-
plitude of a square wave signal (VAmp). This
mode calculates the difference in voltage bet-
ween the upper and the lower level (V
base
and V
top
). The
measurement will only be applied to the selected channel
and requires a minimum of one complete period of a trig-
gered signal.
CREST FACTOR:
The crest factor (peak-to-average ratio)
is calculated from the maximum value divided by the RMS
value of the waveform (Crest).
TOP LEVEL:
This mode measures the mean
voltage level of an upper square wave (V
Top
).
This mode calculates the mean value of the
slope (without overshoot). The measurement will only be
applied to the selected channel and requires a minimum of
one complete period of a triggered signal.