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Tektronix TDS794C
3 GHz, 10 GS/s digital scope

Produced from (?) to (?)

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Manuals – Specifications – Links – Pictures

The Tektronix TDS694C is a four-channel, 3 GHz, 10 GS/s digital scope. The project codename was 'Screamer'.

No earlier revisions (TDS694B etc) appear to have been released.

These scopes contain ICs in the triggering system that are known to fail, commonly understood to be for thermal reasons. Three ICs are present: Ch 1/2, Ch 3/4, 'Other' (ext trig?). The ICs appear to have poor thermal contact with the PCB; when failed, the scope will no longer trigger on the relevant channels (however, signals will still be acquired). It is possible to transplant these ICs with standard SMT hot-air rework equipment. The 'Other' IC has been used as a donor in some cases.

Do not operate this scope without the case on, WITHOUT extra cooling means.

The low (by modern standards) memory length, coupled with the high sample rate of this scope, means that it is best described as a 'one-shot' (or 'transient') digitizer. At the fastest sweep (100ps/div), only 3uS of data can be captured with the standard memory allocation.


     — Acquisition
Sampling rate 10 GS/s on each channel simultaneously
Analog bandwidth 3 GHz (all ranges; 10 mV/div − 1V/div)
Inputs 4 Channels; 50 Ω (DC/GND) only
Resolution 8 bit
Record length 30K samples per channel; 120K samples with option 1M
Modes sample, envelope, peak detect, average
     — Misc
Display 7" diag (640 x 480) color CRT; Zoom
Trigger modes Edge, logic, pulse
Storage 1.44 Mbyte, 3.5 inch, DOS 3.3-or-later floppy disk. Internal hard disk drive (2.1 Gb capacity) with Option 2M. NVRAM storage for saving waveforms, hardcopies, and setups. Iomega Zip Drive compatible.
I/O Full GPIB programmability; VGA output
Hardcopy output using GPIB, RS-232, or Centronics ports