User Manual

15.2 Trigger Section
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15
Chapter 15 Specifications
15.2 Trigger Section
Trigger method Digital comparison
Trigger modes • Memory Function and FFT Function: Single, Repeat or Automatic
• Recorder Function: Single or Repeat
• Real-Time Saving Function: Single, Repeat, or Timer
Trigger source Analog, logic A to D, external trigger, manual trigger, timer trigger
Free-run operation occurs when all trigger types are off.
• Normal Mode
All analog channels can be set as trigger sources
• Expanded Mode
One analog channel can serve as multiple trigger sources
(Up to eight trigger sources on channels in modules (Units) 1 to 4 in Models 8860
and 8861, plus an additional eight sources on channels in modules 5 to 8 in Model
8861.)
External triggering occurs by applying a 2.5 V falling edge signal, or shorted terminals
(can be set to rising edge).
The sources of trigger events are displayed
Trigger criteria AND or OR of each trigger source
Trigger types (analog) • Level Trigger
Set digitally as a voltage value below full-scale
Triggering occurs when the signal rises (or falls) through a specified value.
• Windows Trigger
Upper and lower trigger threshold levels are specified
Triggering occurs when the signal enters or exits the defined threshold range.
• Period Trigger*
A trigger period reference voltage level and period range are specified
The period of the signal rising (or falling) through the specified level is measured,
and triggering occurs when the period is outside of the specified range.
•Glitch Trigger
*
Triggering occurs when the signal pulse width is narrower than the specified pulse
width defined as rising or falling through a specified voltage level.
• Slope Trigger*
Triggering occurs when the signal exceeds (or does not exceed) a specified rate of
change.
• Voltage Sag Trigger (Drop)
Triggering occurs when peak voltage falls below the specified level (for commercial
power).
• Specified Event
The number of times trigger criteria are met (on all trigger sources) is counted, and
triggering occurs when the specified event count is reached.
(* Expanded setting only)
Trigger types (logic) Pattern (mask) trigger by 1, 0, 0|1 or X
(0|1: triggering occurs when changing to either state, X: don’t care)
Trigger filter Off or 0.1 to 10.0 div (settable in 0.1 increments) (Memory Function)
On (10 ms), Off (Recorder Function)
Trigger level resolution 0.1% f.s. (f.s. = 20 div)
Pre-trigger -100 to 100% (settable in 1% increments) recording time is displayed before and after
triggering (Memory Function, Recorder Function)
Trigger timing Start, Stop and Start & Stop (Recorder Function)
Start and Stop criteria can be set independently.
Trigger output Open-collector output (with 5 V output, Active Low)
Pulse Width: at least 1 ms