User Manual Auto : When the oscilloscope meets the trigger condition, it completes a trigger acquisition once; when the trigger condition is not met, it can run the acquisition waveform freely. Normal : When the oscilloscope meets the trigger condition, the input waveform is displayed; when the trigger condition is not met, the original waveform is displayed. 9. Press the Holdoff softkey and turn V0 to set the time that the oscilloscope waits before a trigger to the next trigger, so that complex waveforms are displayed stably. 2.7.13. SPI Trigger In SPI trigger, when timeout condition is satisfied, the oscilloscope triggers when the specified data is found.
When using SPI trigger, you need to specify the SCL clock sources and SDA data sources. Below is the sequential chart of SPI bus. 1. Press the [Trig Menu] button on the front panel to enter the Trigger system function menu. 2. Press the Type softkey, then turn the Multifunctional Knob to select SPI and push down the knob to confirm. 3. Source : Press SCL and SDA softkey to specify the data sources of SCL and SDA respectively. They can be set to CH1-CH2. 4. Data Line Setting: Press Data Width to set the number of bits of the serial data character string. The serial data string can be specified to be from 4, 8, 16, 24, 32 bits long. Press Data softkey, use V0 to set the data, refer to 2.7.10 .
Data Mask : it is hexadecimal, 0-Mask, f-No Mask, 1~e mask some data. 5. Trigger Condition: Press Overtime softkey to set the timeout, the range is from 8 ns to 10 s. Timeout: the clock (SCL) signal need to maintain a certain idle time before the oscilloscope searches for a trigger. The oscilloscope will trigger on when the data (SDA) satisfying the trigger conditions is found. 6. Slope: Press Slope softkey to select the desired clock edge. Rising: sample the SDA data on the rising edge of the clock. Falling: sample the SDA data on the falling edge of the clock. 7. When select SCL channel, press SCL and use Trigger Level knob to modify the trigger level of the SCL channel.
When select SDA channel, use Trigger Level knob to modify the trigger level of the SDA channel. 8. Press the Mode softkey, turn V0 to select the trigger mode (auto, normal), and press V0 to confirm. Auto : When the oscilloscope meets the trigger condition, it completes a trigger acquisition once; when the trigger condition is not met, it can run the acquisition waveform freely. Normal : When the oscilloscope meets the trigger condition, the input waveform is displayed; when the trigger condition is not met, the original waveform is displayed. 32 / 67