28119 Parallax Inc, 28119 Datasheet - Page 117
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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' Understanding Signals - OPAmpExamplewithFREQOUT.bs2
' Generate a sine wave for the op-amp
'{$STAMP BS2}
'{$PBASIC 2.5}
DO
LOOP
Keep in mind that the amplifier gain for Ri = 1 kΩ and Rf = 2 kΩ should be about 1.5.
The best way to measure this is with the Horizontal Bars cursors. Figure 8-11 shows the
Horizontal Bars cursors measuring the amplitude of the input signal on OPTAscope CH1.
FREQOUT 15, 1000, 1000
√
√
√
√
√
Arrange the signals in the Plot Area so that that their lowest peaks align as
shown in Figure 8-11.
Set the Cursor Settings switches to Horizontal Bars and Snap to Plot.
Measure the amplitude of the input signal and make a note of the ∆ V in the
Cursors box.
Repeat the measurement for the output signal, again noting the ∆ V.
Divide the ∆ V measurement for the output by the ∆ V measurement for the
input. This will give you the signal gain, and it should be fairly close to 1.5.
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