Tag: Tektronix Oscilloscope
Tektronix 7854 Waveform Keyboard Rebuild
From the Tek Wiki:
The Tektronix 7854 Waveform Processing Oscilloscope, introduced in 1980, is a 400 MHz combined analog / digital mainframe in the 7000 series that takes two vertical and two horizontal 7000-series plug-ins. In addition to a conventional analog (real time) scope, it contains an equivalent-time sampling 10-bit digitizer and a programmable waveform processor with GPIB interface. The waveform processor can be programmed using a detachable calculator-style keyboard, using postfix operators (“reverse Polish notation” like HP calculators) that operate on entire waveforms, not just individual numbers.
Tek 7854 Mainframe #2 after cleaning
It is to the repair of the detachable keyboard that this post is devoted. I purchased a keyboard for a reasonable price only to find that some keys were intermittent, and some did not work at all.
Opening up the keyboard showed … Read More »
Tektronix 556 Dual Beam Oscilloscope Testing: Vertical Bandwidth
I have been doing some basic testing of my Tektronix 556 Dual Beam Oscilloscope, and I have documented some parts of this process. I have also captured images of the traces, which I will share here.
Test Setup: Tektronix 556, 1A2 plug-in, Timebase A, Tektronix SG 503 Generator, and Tektronix TG 501 Time Mark Generator
I found the -3db vertical bandwidth of the 1a2/556 to be 65 Mhz, which is to be expected for the 50 Mhz rated 1A2.
TM 500 Module with Plug ins
50 kHz Reference Signal 6v peak to peak
5 MHz Sine Wave 6v peak to peak
20 MHz Sine Wave 6v peak to peak
Tektronix 556 Dual Beam Oscilloscope Images
What follows is a series of images of my Tektronix 556 Dual Beam Oscilloscope displaying various waveforms. I am learning about this scope and how to use it.
A brief description of the unit can be found here: Tektronix 556
Thanks for reading.
Tektronix 556 Dual Beam Oscilloscope
I had recently the unique opportunity to acquire a complete Tektronix 556 Oscilloscope setup. This comprised the oscilloscope itself, the matching scope cart, original manual, probes and 12 plug-in units. This in itself is rare enough, but in addition, this particular scope has the optically desirable blue phosphor CRT and Tektronix C-27 Camera Bezel. This 50 MHz bandwidth oscilloscope was the state of the art when it was introduced in the mid 1960’s: Tekwiki Tek 556
This will be the first of many posts and updates as I work my way through checking and restoring this beautiful scope.
And now some images:
Tektronix Oscilloscopes 7904, 2467B, 2465B at 1GHz
The images to follow show a 1 GHz sine wave (amplitude not changed during the testing) on the following Tektronix oscilloscopes:
Tektronix 7904 with 7A24 vertical (400 MHz) and 7B92A horizontal
Tektronix 2467B (400 MHz scope)
Tektronix 2465B (400 MHz scope)
I have checked the bandwidth of the both the 2465B and 2467B used here, and they meet the 400MHz requirement at -3db (using a Tektronix SG504 with leveling head). The bandwidth of the 7904 mainframe + 7A24 vertical plug-in used in this … Read More »