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The parameters shown in this table are used when measuring period or frequency.
Trigger Type
0
2–5
6
Example: Measuring Frequency
Assume a frequency measurement is requested on CH 1, and 20 measurements are
desired at a .5 second sample time. The following commands would set up the CBL 2
for this example:
{1,1,6}
{3,.5,20,2,0,1}
3 = Sample and Trigger setup command
.5 = Sample time of 0.5 seconds
20 = Number of samples to take
2 = Trigger from rising edge to rising edge for frequency
0 = Trigger channel not applicable
1 = Trigger at 1 Volt
Assume a ±10 Volt, 20 Hz sine wave is the input signal on pin 1. The CBL 2 follows the
sequence of steps indicated below when the first trigger occurs (a trigger occurs every
0.05 seconds).
1. Trigger occurs on the rising edge.
2. Start counter and timer.
3. Stop timer at next rising edge.
4. Wait until 0.25 seconds has elapsed.
5. Stop counter (count should be about 5).
6. Count is less than 150 (or 600 Hz); therefore, frequency is computed from the
time interval for one period.
7. Wait for 0.5 seconds specified in Sample Time.
8. Wait for additional processing time to complete. (This time depends on what
processing is currently being performed and is typically about 0.25 additional
seconds.)
9. Repeat steps 1 through 8 for nineteen more samples.
In this example, the CBL 2 takes approximately 15 seconds to complete all the sampling
and turn on the DONE indicator in the display.
20
Edge Polarity Used
Rising (+)
Specified by trigger type
Not allowed (E.34 error).
Hardware Threshold Used
Trigger Threshold parameter
Trigger Threshold parameter
CBL 2 Technical Reference
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