Individual tests
Signal levels per
▼
▲
N 2: 1.9Vd[OK]
: 3.5Va[OK]
N 4: 1.9Vd[OK]
: 3.5Va[OK]
N 7: 1.8Vd[OK]
: 3.7Va[OK]
Please note:
•
The scan of the node IDs always lasts for the pre-set scan time.
•
The measurement of the signal levels lasts for the set maximum measuring
time at the longest.
•
When the differential and the absolute signal levels of all identifiers have
been measured as often as is required for averaging (default setting 3
times), the measurement is already ended before the set measuring time has
elapsed.
•
If identifiers are transmitted at short intervals one after the other (approx.
10 µs) or in the case of a large number of node IDs (max. 127), several min-
utes may elapse before measurement is completed.
•
In order to give the CANcheck time to process the node IDs, a certain bus
load must not be exceeded. With an equally distributed bus load, the fol-
lowing reference values apply:
-
127 node IDs in 2048 11-bit identifiers can be measured with 73 %
bus load.
•
For signal level measurement, the node IDs must appear frequently, i. e. they
must be periodic. If the measurement does not end until the maximum
measurement time has elapsed, this requirement is not met by all node IDs.
The signal levels of non-periodic node IDs are not available. They are dis-
played as follows:
-.- Vd [PER?] or -.- Va [PER?].
•
For signal level measurement, the node ID must be followed by the data
length code 1 or greater because in general one bit of the first data byte is
required. In addition, the bit stream after the node ID must include two
dominant bits in a sequence. The signal levels of node IDs without these bits
are not available. They are displayed as follows:
-.- Vd [BIT?] or -.- Va [BIT?].
Copyright IXXAT Automation GmbH
CANcheck Manual, Version 1.2
49
