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Show us your square wave

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tautech:

--- Quote from: Rupunzell on February 01, 2015, 05:05:34 pm ---
--- Quote from: tautech on January 31, 2015, 10:54:56 pm ---While you are both to'ing and fro'ing somebody should state a load impedence which WILL make a massive difference at those frequencies.

--- End quote ---
Load impedance is only part of a transmission line system.

Source impedance, termination-load impedance, connectors and transmission line all matter. If the currently common BNC worked past 110 Ghz, there would be no reason for connectors like N, TNC, SMC, SMB, SMA, WSMA, APC-7, APC-3.4, K, 2.92mm, 2.4mm, 1.85mm, V, and others.

When Ghz systems are discussed, connectors and the entire transmission line system performance matters.


Bernice

--- End quote ---
Exactly.
Thanks

anotherlin:
Sorry for being late.

Here's 1V 1MHz square wave from a Hameg 8030-2 function generator module.
It's straight from the BNC output to 1:1 10MHz probes of a Hameg HMO722 scope.
Note that I'm running an old version of the firmware of the scope, but I don't think that changes things much.

The generator is pretty old, around end of the 80s. Fully analog with digital "metering".
It is capable of square, sine, and triangle, with a maximum of 1MHz.
I sold it about 2 weeks ago, so no more test possible.

I do have an Hameg 8130 generator (build 1993), which is more capable (10MHz max).
I will post captures shortly if you guys are interested.

lincoln:
At risk of bringing back a zombie thread, I finally got a scope with some bandwidth.

Not so much a square wave but a pulse generator, rated at 350ps @ 25V, I have absolutely no use for this but it was dirt cheep off of ebay. I want to get some hardline to bridge the generator and attenuator together,



MadTux:
Lol, that's basically a glorious Jim Williams pulse generator sold in a TM 5000 box, although the 50kHz rep rate generator is a nice addition to the original free running version, if you don't want too much jitter.

Please take the covers off, I'm seriously wondering how they managed to get 10m of coax charge line inside a TM 5000 box. The 60ns/15m delay line in the HP 215A fills the complete lower part of a 19" rack box.

lincoln:

--- Quote from: MadTux on May 10, 2015, 12:50:15 am ---Lol, that's basically a glorious Jim Williams pulse generator sold in a TM 5000 box, although the 50kHz rep rate generator is a nice addition to the original free running version, if you don't want too much jitter.

Please take the covers off, I'm seriously wondering how they managed to get 10m of coax charge line inside a TM 5000 box. The 60ns/15m delay line in the HP 215A fills the complete lower part of a 19" rack box.

--- End quote ---

Here is the album: http://imgur.com/jYPxmTx,YdjCfHB,dmWnbBR,CYQqv9x

the attenuator has GPIB and there are two tiny jumper (in addition to the coax) that bridge the two that lets you control the fine amplitude adjustment and suppress pulses.... I'm not allowed on ebay any more.

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