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84
M2 Data Acquisition Device
Digital Multimeter Operations
During normal operation, the scope collects just enough data samples to plot a waveform across
the screen. When peak is active the scope samples data at the maximum highest rate, which
collects more data than what is needed to simply construct a waveform across the screen.
Therefore, any signal glitches or fast events are captured.
Invert
Pressing the F3 key inverts, or switches, the polarity of the signal trace so that it appears
upsidedown on the screen. This is typically used to sample amperage or high-voltage signals.
Coupling
Pressing the F4 key switches the input to the meter from DC coupling (default) to AC coupling. In
this mode the average value of the waveform is subtracted so that small signal variations become
apparent. AC coupling blocks the DC portions of an input signal in order to amplify the AC portions
without driving them off of the screen. Use for viewing alternator ripple or fuel pump amperage.
Position Selections
The Position selections allow you to reposition the baselines of the channel 1 and channel 2 traces
vertically on the screen.
Figure 8-16 Sample screen with both traces repositioned
Channel 1 Trace
Use the F2 and Min/Max keys to reposition the channel 1 trace as follows:
•
Short pushes of the
F2
key moves the trace incrementally up.
•
A long push of the
F2
key places the trace at the midpoint of the scale.
•
Short pushes of the
Min/Max
key moves the trace incrementally down.
•
A long push of the
Min/Max
key places the trace at 10% of the scale.
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Содержание VERDICT D7
Страница 1: ...User Manual May 2011 EAZ0063L05C Rev B ...
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