User Manual

458
────────────────────────────────────────────────────
18.3 Trigger Unit
────────────────────────────────────────────────────
Trigger Method Digital comparison
Trigger modes
Function Available trigger modes
Memory recorder Single, repeat, auto
Recorder, RMS recorde
r
Single, repeat
Recorder & Memory Single, repeat, timer
FFT Single, repeat, auto
Trigger source CH1 to CH32, logic CHA to CHH
・External trigger (With an external trigger, the triggering occurs on a
falling edge of 2.5 V, or when the terminals are shorted together.)
・Manual trigger
・Timer trigger
・Sources can be set on or off. When all sources are off, the unit is in the
free-run state.
Trigger conditions can be set for each channel individually.
Trigger conditions Logical AND or OR of any trigger sources
Trigger types (analog) (1) Level trigger
・Digital setting of voltage values for full scale
・Triggering occurs at rising edge (falling edge) of set value.
(2) Window-in, window-out trigger
・Upper and lower trigger levels can be set.
・Triggering occurs when the waveform enters or leaves the defined area
.
(3) Voltage drop trigger (for commercial power supplies)
・Triggering occurs when the peak of the voltage falls lower than the
setting level.
(4) RMS level trigger (for commercial power supplies and DC)
・Set the RMS value by digital value.
・Triggering occurs at rising edge (falling edge) of set value .
(5) Period trigger
・This function sets both the period reference voltage and the period
range, and measures the rise (fall) period of the set voltage.
・When the measured period deviates from the specified range, triggerin
g
occurs.
Trigger type (logic) Pattern trigger specified by 1, 0, and ×
(× means that either 1 or 0 is fine.)
Trigger filter ・MEM, REC&MEM, FFT: OFF, 0.1,0.2,0.5,1.0,1.5,2.0,2.5,5.0,10.0 DIV
・REC: ON, OFF （10 ms fixed）
Trigger level resolution 0.25%f.s.（f.s.＝20 DIV）
Pre-trigger ・MEM, REC&MEM, FFT: 0,2,5,10,20,30,40,50,60,70,80,90,95,100,-95 %
・RMS: 0,5,10 DIV
Trigger timing Start, Stop, Start and Stop (REC)
Trigger output ・Open collector output (with 5 V output voltage, active low)
・Pulse width 2 ms min.
Level meter function ・When waiting for trigger, the level of the analog input signal is
displayed on the DISPLAY screen.
1
8.3 Trigger Unit