In slope trigger, the oscilloscope triggers on the positive or negative slope of the specified time. This trigger mode is applicable to ramp and triangle waveforms. Trigger Type:
Press Type, rotate to select “Slope” and press down . At this point, the trigger setting information is displayed at the upper right corner of the screen. For example, . The trigger type is slope trigger; the trigger source is CH1; the difference between the upper limit of trigger level and the lower limit of trigger level is 400 mV.
Source Selection:
Press Source to switch the signal source and select CH1-CH4. For the details, please refer to the introduction in “Trigger Source”.
Note: Select channel with signal input as trigger source to obtain stable trigger. Slope Condition:
In this oscilloscope, positive slope time is defined as the time difference between the two crossing points of trigger level line A and B with the rising edge; negative slope time is defined as the time difference between the two crossing points of trigger level line A and B with the falling edge as shown in the figure below.
Figure 5-4 Positive Slope Time/Negative Slope Time Press When to select the desired slope condition.
: trigger when the positive slope time of the input signal is greater than the specified time.
: trigger when the positive slope time of the input signal is lower than the specified time.
: trigger when the positive slope time of the input signal is greater than the specified lower limit of time and lower than the specified upper limit of time. : trigger when the negative slope time of the input signal is greater than
the specified time.
: trigger when the negative slope time of the input signal is lower than the specified time.
A B
The upper limit of trigger level (Up Level) The lower limit of trigger level (Low Level)
Positive
MSO1000Z/DS1000Z User’s Guide 5-11 : trigger when the negative slope time of the input signal is greater than the specified lower limit of time and lower than the specified upper limit of time. Time Setting:
When the Slope Condition is set to , , or , press Time and use to input the desired value. The range available is from 8 ns to 10 s.
When the Slope Condition is set to or , press Upper Limit and Lower Limit and use to input the desired values respectively. The range of time upper limit is from 16 ns to 10 s. The range of the time lower limit is from 8 ns to 9.99 s.
Note: The time lower limit must be lower than the upper limit. Vertical Window and Trigger Level:
After the trigger condition setting is completed, adjust the trigger level using
TRIGGER LEVEL to correctly trigger the signal and obtain stable waveform. The adjustment mode of the trigger level is different when different vertical window is selected in slope trigger. Press Vertical and use to select the desired vertical window or press down Vertical continuously to switch the vertical window. You can choose to only adjust the upper limit, the lower limit or both of them.
: only adjust the upper limit of the trigger level. During the adjustment, “UP Level” and “Slew Rate” change accordingly but “Low Level” remains unchanged.
: only adjust the lower limit of the trigger level. During the adjustment, “Low Level” and “Slew Rate” change accordingly but “UP Level” remains unchanged.
: adjust the upper and lower limits of the trigger level at the same time. During the adjustment, “UP Level” and “Low Level” change accordingly but “Slew Rate” remains unchanged.
When the Slope Condition is set to , , , or , the current trigger level and slew rate will be displayed at the lower left corner of the screen, as shown in figure 5-5 (a). The formula of slew rate is:
UpLevel - LowLevel SlewRate =
Time (5-1)
When the Slope Condition is set to or , the current trigger level and slew rate range will be displayed at the lower left corner of the screen, as shown in figure 5-5 (b). The formula of slew rate range is:
UpLevel - LowLevel UpLevel - LowLevel
SlewRate = ~
RIGOL Chapter 5 To Trigger the Oscilloscope
5-12 MSO1000Z/DS1000Z User’s Guide
(a) (b) Figure 5-5 Trigger Level Information Display
Note: Under the “Slope” trigger menu, you can also press down the trigger level knob continuously to switch the vertical window.
During the adjustment of trigger level, two orange trigger level lines and two trigger marks ( and ) appear on the screen and move up and down with the rotation of the knob. At the same time, the current trigger level information is displayed at the lower right corner of the screen according to different slope condition settings. After stopping turning the knob, the trigger level lines and trigger level information disappear in about 2 s.
Trigger Mode:
Press Sweep to open the trigger mode list and select auto, normal or single. For the details, please refer to “Trigger Mode”. The corresponding status light of the current trigger mode turns on.
Trigger Setting:
Press Setting to set the trigger parameters (trigger holdoff and noise rejection) under this trigger type.
MSO1000Z/DS1000Z User’s Guide 5-13