11401: Difference between revisions

Revision as of 06:12, 5 May 2018

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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 5 ns 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. The plug-in connector's differential "DISPLAY" pins are connected to the samplers by coaxial cable, i.e. there are no high-speed amplifiers in the mainframe's signal path. The DISPLAY+ and DISPLAY- signals are fed to separate samplers. The sampled signals are combined in the channel switch to obtain a single-ended signal that is fed to the ADC.

The outputs of the sampling gates are multiplexed by a channel switch into an ADC. A two-stage pipelined ADC (Tek part number 155-0289-01) is used, with five bits per stage. Each stage has a bank of 32 comparators.

The output of the ADC is stored in RAM. The contents of the RAM may have many points depending on the size of the acquisition window. The "Waveform Compressor" board takes the contents of the acquisition RAM and renders it to 512 points on the horizontal axis for display.

Specifications

please add

Links

Tek 11401 @ barrytech.com

Pictures

Prototype 11401 LV PSU diagnostic LEDs
Prototype 11401 LV PSU Control Rectifier
Prototype 11401 LV PSU Inverter
Prototype 11401 TImebase Board
Prototype 11401 Trigger 155-0239-02
Prototype 11401 acquisition board right
Prototype 11401 acquisition board left
Prototype 11401 acquisition board
Prototype 11401 bottom internal
Prototype 11401 bus signals
Prototype 11401 waveform compressor back
Prototype 11401 waveform compressor front
Prototype 11401 670-8858 board back
Prototype 11401 670-8858 board front
Prototype 11401 I/O board back
Prototype 11401 I/O board front
Prototype 11401 display side
Prototype 11401 display top
Prototype 11401 bus socket
Prototype 11401 bus
Prototype 11401 670-8855 board rear
Prototype 11401 670-8855 board front
Prototype 11401 1562472-00
Prototype 11401 memory board rear
Prototype 11401 memory board front right
Prototype 11401 memory board front left
Prototype 11401 memory board front
Prototype 11401 display controller right
Prototype 11401 display controller left
Prototype 11401 display controller
Prototype 11401 top internal
11401 right side
11401 rear

@@ Line 43: / Line 43: @@
 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,
+The 5 ns 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.
-The plug-in connector's differential "DISPLAY" pins are connected to the samplers by coaxial cable, i.e., there are no
+The plug-in connector's differential "DISPLAY" pins are connected to the samplers by coaxial cable,
-no high-speed amplifiers in the mainframe's signal path.
+i.e. there are no high-speed amplifiers in the mainframe's signal path.
 The DISPLAY+ and DISPLAY- signals are fed to separate samplers.
 The sampled signals are combined in the channel switch to obtain a single-ended signal that is fed to the ADC.