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Scope Multimeter Operation and Controls
To turn the filter on and off, select the Filter icon.
Invert
The Invert feature is used to switch signal polarity, so the trace appears upside down (inverted) on
the screen. This is typically used when measuring amperage using the low amp probe, or high-
voltage signals like, secondary ignition.
Example: A signal that normally rises from 0 to +5 volts, if inverted would show falling
from 0 to –5 volts.
To turn inversion on/off, select the Invert icon.
Coupling AC
Coupling AC subtracts the average value of a signal so that small variations can be displayed in
the waveform. This is accomplished by blocking the direct current (DC) portions of a signal in
order to amplify (show) the alternating current (AC) portions of the signal, without driving the trace
off of the screen.
Using coupling AC can be helpful when testing and diagnosing alternator ripple or fuel pump
amperage, by allowing you to see any abnormal small variations or events.
To turn coupling AC on and off, select the Coupling AC icon.
Trigger
i The Trigger feature is only available in the lab scope function.
A trigger can be used to stabilize a changing or erratic signal (a signal that may flicker or drift as it
refreshes), so that it is easier to view or diagnose. This stabilization effect is accomplished by
basically displaying the same part of the trace repeatedly from the same starting point, thus the
flicker or drift is minimized which makes the trace appear more consistent or static.
A trigger is basically a “specific point” on the display, at which a trace will start to display (start the
sweep) if it crosses that point.
Filter Icons
On (Interference is suppressed) Off (Interference is not suppressed)
Invert Icons
On (Polarity is inverted) Off (Polarity is not inverted)
Coupling AC Icons
On (DC signal portion blocked) Off (DC signal portion not blocked)
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