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User Manual

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.

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.

DigiTech QC1938 User Manual

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