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15.
Value display current sample rate setting.
16.
Two purple lines for cursor 1 and cursor 2 in cursor measurement
17.
Percentage value indicates trigger position for next sampling in storage area.
18.
Red square indicates the current sampling data position in storage area.
19. Red scale line indicates the time base width in sampling data display area and totally 4.8 divisions. The
width between two long scale lines is 1 division and between short scale lines are 0.1 divisions.
14. How to acquire data
When you start to acquire LA begins sampling data from the probes. Then each time clock occurs the data will
be sampled.
Then sampled data is sent to trigger function block and store in main memory. The trigger program checks
specific events with the sampled data and take specific action. The trigger program can check events as rising
edge, data values, and data ranges etc. LA module enables a post trigger delay counter when trigger reach
specified value and to allow post trigger portion of the acquisition memory to fill before data acquisition stops.
Press "F" to get into data acquisition mode after finish setting for trigger and sampling. Then running status
display as "RUN" and running status display "TRIG" when detected trigger signal and display "STOP" when
data acquisition finished. Then you can start to analyze data. Data acquisition can be stopped by press "F"
again during the process.
Note:
When running status display as "RUN", "TRIG" during data acquiring process, only "F" key
for operate and other keys or knobs are idle. Only till status display as "STOP" then others
operations are working.
15. How to observe and analyze the data
Follow up below steps to observe and analyze the current data acquired:
1.
Turn "Sec/Div" knob to adjust the time length for data display in each division (to adjust the data
resolution displayed).
2.
Turn "Cursor" knob to observe more details for the data of current cursor position. The data of binary
value for current cursor position display in binary system area and power on measure menu then bus
value for current cursor position will display in measurement window.
3.
Turn "horizontal position" knob can move the current displayed data to left/right position in storage area
quickly.
We will use a simple measurement example to explain the primary setting for LA measurement.
We need to measure a three lines SPI signal, three signals are enable, clock and data. Clock is in effect when
enable is low clock data, and clock frequency is 1M, data width is 32 digits, every clock corresponds to one
data. Signal voltage is 3.3V.
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