Page
18
October 2014
Sample data area indication
: red for bus, blue and green for "0", "1" in
each channel data.
Decimal system value indicate the position of current cursor relate to
current trigger.
Operation options indicate current function menu and different function
menu have different display.
Sample status indicate
: "RUN" for sampling and wait for trigger, "TRIG"
for trigger detected and wait for sample finished. "STOP" for sampling
finished.
Value indicate current time base.
Info windows
: different operation display different info.
Value display current filter modulus setting.
Value display current sample rate setting.
Two purple lines for cursor 1 and cursor 2 in cursor measurement.
Percentage value indicate trigger position for next sampling in storage
area.
Red square indicate the current sampling data position in storage area.
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.
2.3.3
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.
