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User Manual
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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.
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.
2.7.14. IIC Trigger
IIC (Inter-IC bus) signals setup consists of connecting the oscilloscope to the serial data (SDA) line and the serial clock (SCL)
line and then specifying the input signal threshold voltage levels.
To set up the oscilloscope to capture IIC signals, please refer to the following:
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 IIC and push down the knob to confirm.
3. Source Selection: Press SCL and SDA softkey, turn the Multifunctional Knob to to specify the data sources of SCL and
SDA respectively. They can be set to CH1-CH2.
4. Press When softkey to set trigger condition. Select trigger condition “Start Bit”, connect the SCL signal to CH1 and connect
the SDA signal to CH2.
Press the corresponding Level softkey; then, turn the Trigger Level knob to set the signal threshold voltage level.
Data must be stable during the entire high clock cycle or it will be interpreted as a start or stop condition (data transitioning
while the clock is high).
Trigger Condition: Press When softkey to select the desired trigger condition.
➢ Start: trigger when SDA data transitions from high level to low level while SCL is high level.
➢ Stop: trigger when SDA data transitions from low level to high level while SCL is high level.
➢ No Ack: trigger when the SDA data is high level during any acknowledgement of SCL clock position.
➢ Address: the trigger searches for the specified address value. When this event occurs, the oscilloscope will trigger on the
read/write bit.
The AddrBits is "7 bits"; so the range can be from 0 to 0x7F.
➢ Restart: trigger when another start condition occurs before a stop condition.
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