Hioki 8847, Instruction Manual

Page: 310 / 372

17.3 Trigger Section
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17.3 Trigger Section
Trigger method Digital comparison
Trigger modes • Memory Function, FFT Function: Single, Repeat, or Automatic
• Recorder Function: Single or Repeat
Trigger source Analog Unit (Ch1 to Ch16), Standard Logic 16 Ch Logic Unit (Max. 3 units, 48 Channels)
External Trigger occurs by applying a 2.5 V falling edge signal, or shorted terminals
Independent trigger criteria settable for each channel
Free-run operation occurs when all trigger types are off.
Manual trigger Included
Trigger criteria AND or OR of each trigger source
Trigger types (analog) • Level Trigger
Set digitally as a voltage value below full-scale
• Voltage Sag Trigger (Drop)
Triggering occurs when peak voltage falls below the specified level (for commercial power).
(for 50/60 Hz commercial power)
• Window 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
Set voltage level and pulse width (glitch width)
Triggering occurs when the signal pulse width is narrower than the specified pulse width defined
as rising or falling through a specified voltage level.
• Event Trigger
Triggering occurs when the event values specified for the level or glitch trigger are exceeded.
Triggering occurs when the input rises above (or falls below) the specified trigger voltage level.
Trigger types (logic) Pattern (mask) trigger by 1, 0, or x (x: don't care)
Trigger filter • Memory Function, FFT Function : Off, 0.1, 0.2, 0.5, 1.0, 1.5, 2.0, 2.5, 5.0, 10.0 div
• Recorder Function : Off/On (10 ms fixed)
Trigger types (external trigger) External signal is used as trigger.
Trigger types (timer trigger) Triggering occurs at a preset time.
Trigger level resolution 0.1% f.s. (f.s. = 20 div)
Pre-trigger Memory Function, FFT Function
% setting: 0, 2, 5, 10, 20, 30, 40, 50, 60, 70, 80, 90, 95, 100, -95%
div setting: Setting by units of 1 div
Trigger priority Off/On
Trigger timing Start, Stop and Start & Stop (Recorder Function)
Trigger output Open-collector output (with 5 V output, Active Low)
Pulse width at level setting time: (sampling rate × no. of data points after trigger) or more
Pulse width at pulse setting time :2 ms ± 1 ms
Trigger input and output termi-
nals Terminal Block
Level display function Included
Trigger marker Trigger marks indicate positions of trigger events
Trigger search function Searches for positions that meet trigger criteria