28014 Parallax Inc, 28014 Datasheet - Page 25

• Manufacturer Part Number: 28014
• Description: OSCILLOSCOPE USB 200KHZ
• Manufacturer: Parallax Inc
• Type: USBr

Specifications of 28014

• Includes: Probes, Software, USB Cable
• Bandwidth: 200kHz
• Channels: Dual
• Display Type: None - Requires Computer and Monitor
• Probe Type: Hook Probes x1 (3)
• Sampling Rate (per Second): 500ks/s
• Voltage - Input, Max: 20V p-p
• Voltage - Supply: 5 VDC, USB Powered
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Input Impedance: -
• Rise Time (typ): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: Q2119020

If you could watch the OPTAscope Plot Area while you programmed the BASIC Stamp,
you would see the signal change from high (5 V) to low (0 V). Now you can see that the
oscilloscope displays a low (0 V) as a line starting right at the blue arrow to the left.
Since the BASIC Stamp is not changing the voltage level on this I/O pin during the
program, you see a flat line. The next activity will generate a voltage that changes over
time to make the plotted signal more interesting.
√
Change the
HIGH 14
command to
LOW 14
. What do you see now?
Figure 1-17:
High signal
example from a
BASIC Stamp