93
Scope Multimeter
Operation and Controls
Trigger Auto/Manual Mode (Optional Setting)
NOTE:
i
The Auto and Manual Trigger modes allow you to set the criteria used to display signals on the
screen. To change the trigger mode, the trigger must be set on one of the channels.
In both Auto and Manual Trigger mode the screen is updated when the signal crosses the trigger
point in the selected direction (rising or falling), however:
•
Auto Trigger
—(default mode)
–
when Auto Trigger is on, even if the signal does not cross the trigger point, the screen
automatically updates after a short period (allowing you to see the waveform). When this
occurs, the message "Waiting for the trigger"
is displayed on the screen.
The trigger point can then be set to optimize viewing.
•
Manual Trigger
–
when Manual Trigger is on, if the signal does not cross the trigger point the screen will not
update. This allows you to capture intermittent events, as the screen only updates when
the signal meets your trigger selection.
NOTE:
i
When using Manual Trigger, it may be easier to initially set the trigger point using Auto Trigger, as
the screen will update regardless if the signal crosses the trigger point. Once the trigger point is
set, then switch to Manual Trigger mode.
z
Selecting Trigger Auto/Manual Mode:
1. From the Control Panel (on the test meter screen), turn the trigger on for the desired channel.
2. Select the
Settings
icon from the toolbar.
3. Select
Settings > Configure Scope / Meter > Trigger Mode
from the menu selections.
4. Select either
Auto Trigger
or
Manual Trigger
.
5. Select
Back
or press the
N/X
button to navigate back to the test meter screen.
Threshold
NOTE:
i
The Threshold function is only available in the Graphing Meter function for specific tests. This
function may also be referred to as Auto Threshold Select (ATS).
The Threshold function can be used, to display and obtain a more accurate measurement when
measuring signals (e.g. Frequency, Duty Cycle, MC Dwell and Pulse Width) that may be difficult
to display or have noise or other undesirable variations in the signal. When selected, the
Threshold function automatically sets a trigger and determines a threshold level in the middle of
the signal range (calculated from the Min and Max measurements) to be used as a reference point
to calculate the measurement. The falling edge (slope) of the signal is used in determining the
threshold level.
