95
M2 Scope/Meter
M2 Scope/Meter Operations
Graphing Time-Based Measurement Screens
z
To access time-based measurement graphs:
1. Press the
Graph
key.
2. Press the
S
key.
The M2 Scope/Meter is now in time-based measurement mode.
In this mode, the M2 Scope/Meter uses a specialized strategy called “cycle-by-cycle” (C-B-C)
time-based measurements to capture signal glitches. To do this, the M2 Scope/Meter examines
each cycle of the signal under test, calculates its period, duty cycle and pulse width, and generates
a graphical history of that signal (called a histogram). Any significant variation of the signal is
visible on the histogram.
When you initially enter this mode, the system shows frequency histograms (the default setting).
A press of the S key switches the display from frequency to duty cycle. A second press of the
S key switches the display from duty cycle for pulse width.
There three items displayed on the LCD in the graph mode:
•
A histogram of the signal being measured displays across the screen
•
The averaged result of the timing measurement appears on the upper-right side of the screen
•
The minimum and maximum value readings display on the upper-left side of the screen (after
first pressing the Min/Max key).
Range
A press of either the Range or F3 key takes the meter out of the automatic voltage scale function
and allows you to change the voltage scale or resolution. Subsequent key presses switches the
display between the available ranges. Press and hold the Range key to cancel this function and
return to automatic range operation.
8.3.2 Volts AC
Figure 8-7
Volts AC selected
When sampling AC voltage the soft keys function the much the same as for DC voltage. However,
there are some differences. Brief explanations are provided below, refer to
for more detailed descriptions.
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