User manual

35
Measurements
TRIGGER FREQUENCY: This mode measures
the frequency of the trigger signal bases on the
period duration (f
Tr
). The source for the measu-
rement is the currently set trigger source. The frequency
will be determined with a hardware counter with a high
accuracy of 5 digits.
TRIGGER PERIOD: This mode measures the
duration of periods of the trigger signal (with a
hardware counter T
Tr
).
The automatic measurement results are displayed at the
bottom of the screen. If “n/a” is displayed, the measurement
is not applicable to the signal. For instance, this may be the
case for a voltage measurement on a POD because only
logic states without voltage reference are displayed here. If
“?” is displayed, the display does not show a complete mea-
surement result. For instance, the period to be measured
may not display completely and can consequently not be
identied.
With the soft menu key CLEAR ALL the activated automa-
tic measurements will be switched off.
8.2.1 Statistics for Automatic Measurements
If automaticmeasurementfunctionsaredened,youcan
view statistics for these parameters on page 2|2 of the
AUTO MEASURE menu. The statistics allow you to evalu-
ate a periodic signal over a number of measurements. The
results (current value, minimum, maximum, mean value,
standard deviation and number of measurements) are
shown in table format in the display window. Statistics are
availableforupto1,000captures.Youcandenethede-
sired number with the universal knob or the KEYPAD key
in the CURSOR/MENU section. The mean value and the
standarddeviationareidentiedbymeansofthemostcur-
rent n values where n corresponds to the set captures (soft
menu key NO. OF AVERAGES). Minimum and maximum
of the measurement value applies to the total number of
measurements. The total number of measurements will be
Fig. 8.2: Menu for the automatic measurements settings
The list of available sources only includes displayed channels
(possible sources are analog, digital and mathematical channels).
displayed in the statistics. The key RESET STATISTIC resets
the statistics. All recorded values are erased. This function
canbeusedtorestartthestatisticsatadenedpoint.The
key CLEAR MEASUREMENTS deactivates the automatic
measurements.
Fig. 8.3: Statistics for automatic measurements