Chapter 7 Protocol Decoding RIGOL
DS4000E User’s Guide 7-23
threshold of the channel to 0 V.
When modifying the threshold of the source channel, a dotted line displaying the
current threshold level is displayed on the screen (in the same color as the
channel). It disappears in about 2 s after you stop modifying the threshold.
4. Specify the signal type
Press Signal Type and turn the multi-function knob to select the signal
type that matches the CAN bus signal. You can also press Signal Type
continuously to switch the current signal type.
Rx: the receiving signal from the CAN signal line.
Tx: the transmitting signal from the CAN signal line.
CAN_H: the actual CAN_H bus signal.
CAN_L: the actual CAN_L bus signal.
Differential: the CAN differential bus signal connected to a channel using a
differential probe. The positive lead of the differential probe connects the
CAN_H bus signal and the negative lead connects the CAN_L bus signal.
5. Specify the signal rate
Press Baud and turn the multi-function knob to select the signal rate that
matches the CAN bus signal. The default is 500 kb/s. You can also press Baud
continuously to switch the current signal rate. You can select a preset signal rate
or “User”.
The preset signal rates include 100 kb/s, 125 kb/s, 250 kb/s, 400 kb/s, 500
kb/s, 800 kb/s and 1 Mb/s.
When “User” is selected, press Setup and turn the multi-function knob
or the inner knob of the navigation knob to adjust the signal rate at a
relatively smaller step or turn the outer knob of the navigation knob to
adjust the signal rate at a relatively larger step. The adjustable range is
from 10 kb/s to 1 Mb/s.
Note: The larger the rotation amplitude of the outer knob of the navigation
knob is, the faster the variation of the value will be. When you need to
adjust the signal rate within a relatively larger range, this function can help
you quickly finish the setting.
6. Adjust the sample position
The sample point is a point within a bit’s time. The oscilloscope samples the bit
levels at this point. The sample position is represented by the percentage of “the
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