28119 Parallax Inc, 28119 Datasheet - Page 98
28119
Manufacturer Part Number
28119
Description
KIT UNDERSTANDING SIGNALS
Manufacturer
Parallax Inc
Datasheet
1.28119.pdf
(137 pages)
Specifications of 28119
Lead Free Status
Contains lead
Accessory Type
Oscilloscope
Interface Type
USB
For Use With/related Products
BASIC Stamp® 2 and Board of Education
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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In this example we are using the external trigger function of the OPTAscope 81M. This
keeps the waveform on the screen and prevents it from jumping around, which is also
called false triggering. You can see this by temporarily selecting the CH2 button as the
trigger source.
If you were trigging on the IR detector you’d miss the picture because it would require a
signal change (from high to low) to trigger.
Turning on the Autoscale button will display all 1,500 data points of the signal in the Plot
Area, as shown in Figure 7-9. Notice the Plot Area Indicator bar disappears. This gives the
added benefit of better resolution at a 1ms time base, and you can still see the entire pulse
train.
With the Autoscale button activated, the divisions or boxes on the screen no longer equal 1
ms per box. We have crunched the data so now each box is three times the selected time
√
Under the Cursors tab, turn on the Autoscale button.
Figure 7-9:
Using the
external
trigger feature
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