Hioki 8847, Instruction Manual

Page: 176 / 372

9.8 Pre-Trigger Settings
166
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This applies to the Memory function, and FFT function only.
By setting a portion (number of divisions or percentage) of the recording length to occur before trig-
gering, the waveform is recorded before as well as after the trigger point.
You can also set the duration of a waveform to be recorded after a trigger point.
Set the position of the trigger point relative to the specified recording length.
There are two setting methods. (Setting by percent and setting by div)
9.8 Pre-Trigger Settings
T
Pre-Trigger Setting
Amount Recording
Length
T
Pre-Trigger Setting
Amount
Recording Length
Recording Before Triggering
Recording for a Specified Duration
After Triggering
• When all trigger sources (analog, timer trigger, etc.) are disabled (Off), pre-trig-
ger settings are ignored.
• Pre-triggers cannot be set by div with the FFT function.
9.8.1 Setting the Trigger Start Point (Pre-Trigger)
Procedure
To open the screen: Press the DISP key
→
Waveform screen
1
Select the unit to set the pre-trigger.
Move the cursor to the Pre-trigger.
Select
2 Enter the numerical value.
(When [%] is selected)
With the recording start point as 0% and the recording end point as
100%, set the % for the trigger point.
Select
(When [div] is selected)
With the recording start point as 0div and the recording end point as
the set recording length, set the number of div for the trigger point.
Select
% Settings are by percent. (default setting)
div Settings are by number of div. For external sampling, set by
number of samples.
-95%, 100%, 95%, 90%, 80%, 70%, 60%, 50%, 40%, 30%, 20%, 10%, 5%,
2%, 0%
-Recording length (div) to +Recording length (div)