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Protocol Decoding
When you modify the threshold of the clock channel, a dotted line displaying the
current threshold level is displayed on the screen. It disappears in about 2 s after
you stop modifying the threshold.
Select the Signal Type
Click or tap the drop-down button of Signal to select a signal type that matches the
CAN bus signal. The available signal types include CAN_H, CAN_L, Rx, Tx, and Diff.
•
CAN_H: indicates the actual CAN_H bus signal.
•
CAN_L: indicates the actual CAN_L bus signal.
•
Rx: indicates the Receive signal from the CAN bus transceiver.
•
Tx: indicates the Transmit signal from the CAN bus transceiver.
•
DIFF: The CAN differential bus signals connected to an analog source channel by
using a differential probe. Connect the probe's positive lead to the CAN_H bus
signal and connect the negative lead to the CAN_L bus signal.
Specify the Standard Signal Rate
Click or tap the drop-down button of Baud to select the preset baud rate. The
available baud rates include 10.0 kbps, 19.2 kbps, 20.0 kbps, 33.3 kbps and etc.
Sample Position
Sample position is a point within a bit's time. The oscilloscope samples the bit level
at this point. The sample position is represented by the proportion of "the time from
the start of the bit to the sample point" to the "bit time", as shown in the figure
below.
Click or tap the input field of Sample Position to set it by using the pop-up numeric
keypad. You can also use the corresponding multipurpose knob to set the value. The
settable range is from 10% to 90%.
HDO4000 User Guide
212
One Bit
60%
70%
80%
Figure 15.17 Sample Position
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