Measurements and analysis with the VAS 5051
Your attention must finally be drawn to the fol- lowing points for evaluation of displayed curves which deviate greatly from one of the preset curves:
Only curves recorded under the same condi- tions or prerequisites can be compared with one another
Fluorescent lamps may produce interfering signals
The ignition transformer and leads emit inter- fering signals which may be superimposed on the actual curve or falsify it.
The curves shown here are examples which can- not be used as correct curves for fault finding.
If the DSO test probes are not connected correctly, it may occur that interfering signals from the ignition system are displayed, and not the expected sender or actuator signal.
Test Instruments DSO
Auto level mode
The displayed curve shows the typical wave- shape of interference from illumination by fluorescent lamps.
The interfering curve is superimposed on the measured curve, and changes the overall curve.