70009 Parallax Inc, 70009 Datasheet - Page 117

• Manufacturer Part Number: 70009
• Description: BOOK UNDERSTANDING SIGNALS
• Manufacturer: Parallax Inc
• Type: Signal Analysisr

Specifications of 70009

• Style: Book
• Title: Understanding Signals
• Contents: Guide to Generate, View and Measure Wave Forms
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Other names: 70009PAR

' 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.