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TEKTRONIX TDS 540B 4 CH DIGITIZING OSCILLOSCOPE 500 MHZ 1 GS/S - $550 (Austin)
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The unit is fully operational with a good display and passed all self-tests.
It has been my personal workhorse digital oscilloscope for years and helped debug a number of difficult issues.
I found the advanced DSP MATH especially useful for waveform integration, differentiation and frequency spectrum (FFT) analysis
Options:
13 RS-232/CENTRONICS Hardcopy Interface
1F Floppy Disk Drive
1M 130,000 Record Length
2F Advanced DSP MATH
NOTES:
1) If the Ad is up, then the unit is available
2) TEK scope probe is not included
3) Unit is being sold ASIS but works great
4) Cash or apple pay preferred, no checks
Thanks!