
Functional Description
40
4-Channel SPO Digital Oscilloscopes
Functional Description
III - TRIGGER
System (cont’d)
1. Edge
Trigger
« Edge »
Option
Settings
Description
Type
Edge
The rising or falling edge of the signal source is used to
trigger.
Source
CH1 CH2 CH3 CH4
Note : The trigger source is active even if the channel is
off
.
EXT
The EXT TRIG source signal is not displayed. The EXT
source is the signal
to the “EXT TRIG” input BNC in the back
of the oscilloscope. The trigger level adjustement range is: -
1,6V to +1,6V
.
EXT/5
Same as EXT option, but the signal is attenuated by a factor
of 5. The trigger level range is multiplied by 5 : -8V to +8V
.
AC line
The trigger source signal is the AC line. The trigger coupling
is set to « DC » and the trigger level to 0V.
Slope
Trigger on the rising edge of the source signal.
Trigger on the falling edge of the source signal.
Trigger on the rising and falling edges of the source signal.
Holdoff
Adjustable
Fixed
Use the « Universal » knob to adjust the « holdoff ».
The « holdoff » is fixed to the latest set value
Coupling
DC
All components of the signal source passes
AC
Blocks the DC component and attenuates the AC signal
below 5.8Hz.
Low Pass
Filter
HF reject
Attenuates «
high frequency »
components above
1.27MHz.
High Pass
Filter
LF
reject
Blocks the DC component and attenuates the «
low
frequency »
components below 2.08MHz.
Noise
Reject
On Off
Enable or Disable the Noise Reject
Operation Steps
1. Set the trigger type
1)
Press the “
Setup
» button to open the TRIGGER menu.
2) Press the "
Type
" button and select "
Edge
".
2. Set the trigger Source
Press the "
Source
" button and select the trigger source: "CH1", "CH2", "CH3", "CH4", "EXT",
"EXT/5" or "AC Line".
3. Set the trigger slope
Press the « Slope
» button and select the trigger slope “
”, “
” or “
”.
4. Set the Holdoff
Press the «
Holdoff close
» button
«
Holdoff time
» and use the “Universal” knob to adjust
the « Holdoff » time.
5. Set the Trigger coupling
a. Press the
“Set Up”
button to open the trigger settings menu.
b.
Press the
“Coupling”
button and select the coupling type: “DC”, “AC”, “HF Reject” ou “LF
Reject”.