52
Scope Multimeter
Operation and Controls
Filter - GMM
Using the filter with the GMM, the filter minimizes noise by ignoring or smoothing out fast signal
spikes.
•
For a direct measurement test, such as volts, amps, or pressure, the filter minimizes the
display of very fast spikes by averaging the sampled data when filter is active.
•
For a calculated measurement test, such as frequency, pulse width, dwell, or duty cycle,
extremely fast spikes (20 µS and faster) from sources like the ignition system are ignored
when filter is active.
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.
Filter Icons
On (Interference is suppressed)
Off (Interference is not suppressed)
Invert Icons
On (Polarity is inverted)
Off (Polarity is not inverted)
