Reference Levels panel- fields and controls
Not all items listed in the table are shown for all measurements; The panel only shows fields and controls relevant to the selected
measurement.
Field or control Description
Reference Levels Global sets whether the reference levels defined in this measurement apply to all measurements that
are set to global (the default setting).
Local sets the Reference Level parameters to apply to just this measurement.
Source Lists the source signals used for each edge of the measurement.
Set Levels In Sets the method used to set or calculate the High, Mid, and Low reference levels. Select % or Units
and use the Multipurpose Knob to set custom reference values.
Levels Sets the reference levels as specified percentages of the Top and Base waveform measurement.
T
o set custom reference values, tap Custom, tap a setting field, and use the Multipurpose Knob to set
the different % (relative) or absolute values.
High and Low references are used to calculate rise and fall times. The default High reference is 90%
and Low reference is 10%.
Mid reference is primarily used for measurements between edges such as pulse widths. The default
level is 50%.
Base Top Method Sets the method to calculate the waveform Base and Top values, which is then used to calculate the
High, Mid, and Low reference levels.
Auto is the default method, and automatically determines the best Base Top method to use. Most
commonly sets the Top Base method to Histogram Mode.
MinMax Uses the minimum and maximum values in the waveform record to determine the base and
top amplitude. Useful on a waveform with low noise and free from excessive overshoot.
Histogram Mean uses histogram analysis to calculate the mean or average value using all values
above and below the waveform midpoint. Top is set to the mean high value, and Base is set to the
mean low value.
Histogram Mode uses histogram analysis to calculate the most common values above and below the
waveform midpoint. Top is set to the common high value, and Base is set to the common low value.
Hysteresis Sets the threshold margin to the reference level which the signal must cross to be recognized as
changing; the margin is the relative reference level plus or minus half the hysteresis. Use hysteresis to
filter out spurious events. Tap the field and use the Multipurpose Knob to change the value.
Other measurement settings panels
Measurement Name panel (Measurement configuration menu) on page 1
15
Configure panel (Measurement configuration menu) on page 116
Gating panel (Measurement configuration menu) on page 118
Pass/Fail Testing panel (Measurement Settings menu) on page 119
Menus and dialog boxes
2 Series MSO MSO24 and MSO22 1
17
To Next Page
Loading...
