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M2 Data Acquisition Device Digital Multimeter Operations
Graphing Voltage Measurement Screens
The VERDICT M2 can generate a graphical history of a voltage signal over time, which is called a
histogram. Pressing the Graph button when operating in Volts DC or Volts AC range causes the
display to change from a digital reading to a graphical display.
While viewing a histogram, the function keys operate as follows:
• F1—switches peak detection on and off
• F2—freezes and unfreezes the histogram (pauses and resumes data collection).
• F3—incrementally increases the measurement range. The Range key incrementally
decreases the measurement range.
• F4—incrementally increases the timescale of the histogram. The Graph key incrementally
decreases the timescale.
A digital value of the signal displays in the upper-right corner of the display while operating in
graphing mode.
Graphing with Min/Max Function
In the Volts DC graphing function you can capture and store the minimum and maximum voltages
by pressing the Min/Max soft key. The readings appear in the upper-left portion of the LCD. The
VERDICT M2 device captures and reports very fast events (as fast as 50 microseconds) in this
mode, which is only available in Volts DC.
Press the Min/Max key and the display shows both the instantaneous voltage reading (large
characters) and the minimum and maximum voltages that occurred since the last time the key was
pressed. The displayed values continue to update until the “Min/Max” key is pressed again. Then
the values reset the readings on the display begin the process again. Press and hold the Min/Max
key to cancel this function, and return to the normal volts DC mode.
z To exit graph mode:
• Press and hold the Graph key for two seconds.
Graphing Time-Based Measurement Screens
z To access time-based measurement graphs:
1. Press the Graph key.
2. Press the S key.
The VERDICT M2 is now in time-based measurement mode.
In this mode, the VERDICT M2 uses a specialized strategy called “cycle-by-cycle” (C-B-C)
time-based measurements to capture signal glitches. To do this, the VERDICT M2 unit 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:
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