Scope and Multimeter Operations
Capturing Data
126
•
Frequency - frequency of the signal for the time period between cursor 1 and 2
The cursor measurements panel contains values for each channel in two displays
(
The time and delta display is gray in color and includes (shown when collecting
data):
–
Cursor 1
- cursor position in time at cursor 1
–
Cursor 2
- cursor position in time at cursor 2
–
Delta
- difference in time between cursor 1 and 2
–
Frequency
- the frequency value (Hz) of the signal for the time period
between cursor 1 and 2
The amplitude and delta display is shown in the channel specific color and includes
(shown when data is paused):
–
Cursor 1
- signal amplitude at cursor 1 position
–
Cursor 2
- signal amplitude at cursor 2 position
–
Delta
- signal amplitude difference between cursor 1 and 2
NOTES
Frequency is the number of times a signal repeats itself per second and is
measured in hertz (Hz).
The frequency value displayed, is the inverse of the Delta value, and can also
be calculated as 1 divided by Delta. The frequency value (Hz) shown is
automatically calculated by the scope.
Example 1: Delta = 20.46ms, to get frequency divide 1 by
.02046 (1/.02046 = 48.87Hz)
Example 2: Delta = 2.53ms, to get frequency divide 1 by
.00253 (1/.00253 = 395.27Hz)
Use applicable decimal point placement during division as the Delta value
changes.
9.11 Capturing Data
The primary purpose and advantage of the Lab Scope and Graphing Multimeter, is
their ability to capture, store and playback data (test signals). Having this ability can
be invaluable when diagnosing intermittent issues, by providing you the ability to
navigate through the data in detail to find events of interest, such as glitches and
signal losses. The following sections describe the basics of the data buffer and the
two basic modes of operation, Capture Mode and Review Mode.
9.11.1 About the Data Buffer
To gain a better understanding of the capabilities of the scope and the basics of
capturing and reviewing data, understanding what the data buffer is and how it
works is important.
The Lab Scope and Graphing Multimeter have the capability to capture, store and
playback data (test signals) utilizing internal buffer storage memory. When a test
function is selected (e.g. Lab Scope > DC Volts), the data is automatically stored in
buffer memory, until the Pause icon is selected.
The amount of data you can capture is limited to a predetermined “total buffer
memory” size. When the buffer memory reaches its full capacity, the data buffer will
continue to store new data, however earlier stored data will be removed to allow
room for the new data being stored. The most recent data is always available for
review when the scope is paused, and can be reviewed using the toolbar controls
As a visual aid, a graphic Data Buffer Slider (
2
)) is located at the
bottom of screen and indicates the position of the current displayed frame of data in
relation to the entire buffer memory capacity.
Note:
In Review Mode, the slider can
be used to quickly move through paused data.
In addition, a Data Buffer Position Counter (
1
)) displays the numerical
position of the Data Buffer Slider within buffer memory.
1.
Data Buffer Position Counter (
XX
(minutes):
XX
(seconds):
XXX
(thousandth of a
second)
2.
Data Buffer Indicator Slider
Figure 9-46
1
2
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