Scientific SMO1002, User Manual

Page: 46 / 102

46
Operate Instruction
Observe two irrelative channel signals, follow these steps
：
1. Input two irrelative signals to channel 1and channel 2.
2. Press the AUTO button.
3. Press the TRIG MENU button to enter “trigger menu”.
4. Press the “Type” option button to select “Alternative”.
5. Press the “Channels” option button to select “CH1-CH2”
6. Press the “Source” option button to select “Ch1”.
7. Press the CH1 button and turn the “S/div” knob to optimize waveform display.
8. Press “Mode” option button to select “Edge”, “Pulse”, “Slope” or “Video”.
9. Set the trigger according to trigger edge.
10. Press the “Source” option button to select “Ch2”.
11. Press the CH2 button and turn the “S/div” knob to optimize waveform display.
12. Repeat steps 8 and 9.
c) Coupling
Use the “Coupling” to make sure the signal that passes the trigger circuit. It is useful for us to gather a
steady wave form. If you use the trigger coupling, you should press the “TRIGGER” button and then select
“edge”, “Pulse”, “Video” or “Slope” trigger. Then select the “coupling” option in “Set up menu”.
d) Position
The horizontal position control establishes the time between the trigger position and the screen center. You
can adjust the horizontal “POSITION” knob control to view waveform data before the trigger, after the
trigger, or some of each. When you change the horizontal position of a waveform, you are changing the
time between the trigger and the center of the display actually. (This appears to move the waveform to the
right or left on the display.)
e) Slope & Level
The Slope and Level controls help to define the trigger. The Slope option (Edge trigger type only)
determines whether the oscilloscope finds the trigger point on the rising or the falling edge of a signal.
The TRIGGER LEVEL knob controls where on the edge the trigger point occurs.
Fig. 32 Trigger Level Adjustment
User Manual SMO702, SMO1002