Zelscope is a Windows software that converts your PC into a dual-trace storage oscilloscope and spectrum analyzer. It uses your computer's sound card as analog-to-digital converter, presenting a real-time waveform or spectrum of the signal - which can be music, speech, or output from an electronic circuit. Zelscope features the interface of a traditional oscilloscope, with conventional gain, offset, timebase, and trigger controls. As a real-time spectrum analyzer, Zelscope can display the amplitude and phase components of the spectrum. 
General features
- Responsive real-time display, up to 50 fps refresh
- Single trace, dual trace, and XY (Lissajous) modes
- Bandwidth: 10 Hz - 20 kHz, AC coupling
- Timebase: 10 us - 5 s
- 8-bit and 16-bit acquisition, 11 kHz to 44 kHz sampling rate
- Spectrum analyzer: amplitude and/or phase
System requirements
- 300 MHz or faster PC, 64MB RAM, 1MB of disk space
- Windows® XP
- sound card
Data export
- Raw data export as WAV file
- Screenshots can be saved in BMP and EMF formats
- Visible trace(s) can be saved as text file
- Copy-paste function for screenshots or data files
- Printing
Triggering
- Adjustable trigger level, slope, and delay
- Pretrigger view
- Single shot triggering mode
On-screen measurement
- Two cursors set by left and right click
- Voltage and time difference readout
- Direct frequency readout
XY mode, Lissajous figure for 1:3 frequency ratio
Homepage : http://www.zelscope.com
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