13
IM 701430-51E
Sample Point
Specify the sample point within the bit time.
Value: “18.8” “21.9” “25.0” “28.1” “31.3” “34.4” “37.5” “40.6” “43.8” “46.9” “50.0” “53.1”
“56.3” “59.4” “62.5” “65.5” “68.8” “71.9” “75.0” “78.1” “81.3” “84.4” “87.5” “90.6”
(%)
Setting Vdiff
Select the connection method of the differential probe. See section 1, “Connecting the
Probe.”
Select Vdiff from the following two types. In either case, the logical value is recessive = 1
and dominant = 0.
CAN_L–CAN_H: The recessive electric potential is set higher than the dominant
electric potential.
CAN_H–CAN_L: The dominant electric potential is set higher than the recessive
electric potential.
Note
The bit rate and Vdiff settings are synchronized to the trigger condition menu (see section 2,
“Setting the Trigger Conditions”).
Threshold level (Thr Upper/Thr Lower)
To analyze the indefinite data on the signal, specify two signal levels, Thr Upper and Thr
Lower.
By comparing the measured data against the threshold levels, 0, 1, or indefinite data is
determined.
• When Vdiff=CAN_L–CAN_H
When measured data < Thr Lower: 0
When measured data > Thr Upper: 1
When Thr Lower
≤
measured data
≤
Thr Upper: Indefinite data
• When Vdiff=CAN_H–CAN_L
When measured data < Thr Lower: 1
When measured data > Thr Upper: 0
When Thr Lower
≤
measured data
≤
Thr Upper: Indefinite data
The indefinite data is presumed to be the same value as the previous bit for the purpose
of displaying the result. In addition, if indefinite data is found, an asterisk is indicated on
the frame that contains the indefinite data in the “list below the screen” and the “detailed
analysis list.”
Setting the Stuff Bit (Stuff Bit Operation)
Math1 can be used to perform stuff bit computation. See section 5, “Performing Stuff Bit
Computation.”
Executing the Analysis (Analyze Exec)
Analysis is performed on 4000 frames before and after the trigger target frame. Analysis
is not performed if there is no Start of Frame on the screen. In addition, if an error is
detected in a frame, the analysis on the frame ends at that point, and the next frame is
analyzed.
4. Analyzing and Searching
