11401

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Digitizing scope Tek 11401 Produced from 1987 to 1989 Manuals 11401/11402 introduction please add free user manual see 11402/11403 for manuals of sister models please add service manual (All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

The Tektronix 11401 is a digitizing scope with three plugins accepting 11000-series plugins and 7000-series plug-ins.

The 11401 mainframe uses equivalent time sampling at a rate of 20MHz (20Msps). Each sample has 10 bits of resolution. It is capable of displaying eight separate 10 bit resolution traces at one time. The mainframe is fully remotely programmable over RS-232 or GPIB.

This mainframe accepts up to three plugins with differing numbers of channels and bandwidths. For example, each 11A52 plugin allows two inputs at 500MHz bandwidth (50 ohm only input impedance). The 11A34 plugin allows four inputs at 300MHz bandwidth, and the 11A32 allows two channels at 300MHz. Three 11A34 plugins then allow up to 12 channels of information, but the mainframe limits the number displayed at any one time to eight. The other four channels may still be used for triggering. The 11402 and (later) 11403 and DSA600 mainframes allow up to 1GHz of bandwidth with an 11A71 (one 50 ohm input) or two 50 ohm inputs in the (later) 11A72.

Resolution is up to 10 ps horizontal and 10 bits vertical, with 10,240 points of memory.

Note: The photos of the "Prototype 11401" are of a scope that said 11331 on the front panel.

The project manager of the 11400 series was Tom Rousseau, who was also project manager for the 7854. The 11400 engineering team included some of the main people from the 7854 project.

The 11401 uses the 156-2622-00 SDI controller IC (U330).

Vertical Signal Path

Each of the three plug-in bays in the 11401 has a dedicated sampler. The sampling clock is common to the three samplers. The sampling pulse is generated by an ECL 2-input OR gate being fed SAMPLE_CLOCK and delay_5ns(invert(SAMPLE_CLOCK)). This produces 5ns pulses with rise time around 1 ns. The 5ns pulses are fed to a discrete NPN differential pair operating in a clipping current-switch mode, resulting in faster edges. The output of the differential pair drive a strobe generator IC, U1040, which is an M453 die, packaged as part number 155-0320-00 or 155-0320-01, depending on the mainframe's serial number. U1040 has three sampling strobe outputs, which are fed to the sampling gates.