Setting The Trigger System - Extech Instruments MS400 User Manual

To perform a CH1+CH2 waveform calculation:
1. Press the MENU key and the function menu will appear at the right of the screen.
2. Press the MENU UP or MENU DOWN key to select WAVE MATH. Five options are
displayed at the bottom of the screen.
3. Press the F3 CH1+CH2 key and the obtained waveform M appears on the screen.
Press the F3 key again to close the waveform M.
4. Press the OSC OPTION key and the following will be displayed on the screen:
LEFT/RIGHT – Time Base
UP/DOWN – CH1 Volts/Div
5. Press the OSC UP or OSC DOWN key to adjust the amplitude of the waveform M.
6. Press the OSC OPTION key twice and the following will appear:
LEFT/RIGHT – Time
UP/DOWN – CHM Zero
7. Press the OSC UP or OSC DOWN key to adjust the position of waveform M.
Setting the Trigger
The trigger defines the start time for data acquisition and waveform display. When
beginning to acquire data, the oscilloscope collects sufficient data to draw the waveform at
the left side of the triggering point. After a trigger is detected, the oscilloscope gathers
enough data to draw the waveform at the right side of the triggering point.
To configure a trigger mode setting:
1. Press the MENU key and the function menu will appear at the right of the screen.
2. Press the MENU UP or MENU DOWN key to select TRIG MODE and five selectable
items will be displayed at the bottom of the screen.
3. Use the F1 through F5 keys to make selections.
4. Press the OSC OPTION key and the following will be shown on the screen:
LEFT/RIGHT – Time
UP/DOWN – Trig
5. Press the OSC UP or OSC DOWN key to adjust the trigger level positions.
Figure 37: Waveform Mathematics
34 MS400 Version 2.0 – December 2007