Old

[variometer]

Hello

  Does anyone know if Tektronix made an analog/crt  100 MHz, 2 channel scope that featured 500 uv vertical division (or better)

Thanks

[tooki]

Hi, and welcome!
I don’t think this is going to invite many answers:
1. I doubt you could have come up with a worse thread title if you tried. A title should be a summary of what’s inside. “Old” says literally nothing about your question. If it was written in error, note that as the thread starter, you can edit the post and with it, the title.

2. The Test Equipment subforum would be a better match for this question than here (Projects, etc).

[Jeff eelcr]

The 2225 was the only one I remember with that spec and at nowhere
near 100MHz.
If any others it would be very hi end or custom.
Jeff

[niconiconi]

Check Jim Williams' Application Notes. They contain encyclopedic information on electronics instrumentation and vintage oscilloscopes.

AN70: A Monolithic Switching Regulator with 100μV Output Noise
https://www.analog.com/media/en/technical-documentation/application-notes/an70.pdf

AN124: 775 Nanovolt Noise Measurement for A Low Noise Voltage Reference
https://www.analog.com/media/en/technical-documentation/application-notes/an124f.pdf

The answer is No. There is no Tektronix oscilloscope plug-in that measures down to microvolt with 100 MHz bandwidth. They only go to 1 MHz. Though, at 1mV, there are a few 100 MHz plug-ins.




If you want high-bandwidth, low-level measurement, at least for power supplies, you can do what Jim Williams did - use a general-purpose wideband RF amplifier (he used an HP 461A, as listed), DC-block your input with a large capacitor (most RF DC blocks have a capacitance too small for low-frequency measurements, the HP 10240B DC block is an unusual one was a really huge capacitor inside, but I think it's not difficult to make your own) and proceeds with full 50-ohm instrumentation - RF amplifier + oscilloscope, or spectrum analyzer.

[Neomys Sapiens]

The Tektronix 454 analogue 150MHz scope seems to have a special mode that does at least come a bit closer.
Citation from TekWiki:
It is possible to cascade the channel-1 and channel-2 input amplifiers to obtain a sensitivity of 400 μV/div. In that configuration, the vertical bandwidth is 33 MHz.

[Jeff eelcr]

I did notice that this could be done with some 2400 series DSOs
and some other manufactures scopes.
Jeff