HP 54645D Pushed to the MAX!

Рет қаралды 2,961

2 жыл бұрын

In this video, I wanted to demonstrate how responsive and capable a vintage (1998) digital HP scope (HP 54645D) is. I've also demonstrated the FFT function from the Measurement module (HP 54659B), integration, derivative, XY mode, and lastly, pushed the scope with a 400 MHz signal with surprising results!
Highlights:
02:02 Horizontal MegaZoom
02:39 XY Mode (function gen and mic together)
04:13 HP 54659B Measurement Module (FFT and more)
09:40 Derivative measurement
10:38 Integral measurement
13:46 Spectrum of interrupted data
14:52 RF Measurement (starts at 10 MHz)
18:51 50 MHz, and limit of time division knob
19:36 80 MHz, and some interesting artifacts indicating how the ADC is timed
20:12 100 MHz
20:41 150 MHz
22:55 300 MHz!
24:42 400 MHz!
26:49 More fun with XY Mode
I'd love to hear from you in the comments.
Binural microphone from Kevin, KB9RLW
• Sound - A D.I.Y. binau...
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Пікірлер: 17

@humgarllc1737 Ай бұрын

Scope bandwidth are defined at whether there's more than -3dB rolloff at the bandwidth limit. If you start at Vpp=1V at low frequencies and it gets down to Vpp=0.707V (1/sqrt(2), aka 3dB) or less when you increase the frequency to 150Mhz, you know you've gone past the front end's analog bandwidth limit. You're merely at the natural LPF's roll off (transition band), not the passband anymore.

@tiromancino_tt Жыл бұрын

I recently got a Hp54659B module for my Hp54600B , and I must say that your video has been very useful for me . The FFT of this older oscilloscope is better than many new 100 mhz LCD oscilloscopes. At least in BF where I have fun with audio amplifiers.

@W6EL Жыл бұрын

I'm glad it was helpful. I didn't see very many videos showing enough of how this scope works in practice. I am continually surprised at how useful and well-made this scope is, despite the hate HP receives for their scopes. I think this is one of the good ones.

@ksjung88 6 ай бұрын

Do you know the difference between 54629B and 54659B? I am looking of a module for my old hp 54600B but dunno which to pick.

@tiromancino_tt 6 ай бұрын

@@ksjung88 A module adds functions, what do you need? I needed to have the FFT analysis, the 54659b module added three functions (rs 232 port, parallel port, FFT analysis). This can be verified by reading the HP manual relating to the 54659b module. It is also clearly indicated by writing on the back of the module (Measurement/storage module RS232/parallel interface). The application of this module will be indicated on the oscilloscope start screen. Furthermore, the oscilloscope menu will be enriched with new options relating to FFT and storage. I have not found any documentation on the web for form 54629B. hello

@milantrcka121 Жыл бұрын

I tried my HP54645D with similar results, but "only" up to about 350MHz where trigger goes away.. Quite remarkable. I also tried my stock standard Tek 475. It goes a bit over 400MHz with stable trigger. Had no idea this could work. Thanks for the inspiration!

@W6EL Жыл бұрын

I think it works due to the sample clock sliding around a bit. I think it probably would not work so well but for the periodic nature of what we are measuring.

@milantrcka121 Жыл бұрын

@@W6EL On the HP up until about 200 - 210 MHz both "line" and "dot" displays appear quite stable. On the Tek, we see what we see. Stable display and Trig View shows trigger. Never had the courage to try. Thanks again!

@Wes8761 2 жыл бұрын

Great video! Do you happen to have the logic analyzer cables for this scope? I have a set for my scope and I love it.

@W6EL 2 жыл бұрын

I don't have the cables! It's almost cheaper to buy a scope with the cables and then sell the scope and keep the cables! Cables by themselves tend to be pricey. I was thinking about hacking up an old IDE cable, connecting it to headers on a board and making my own probes... I dunno. It seems pretty handy, even just as a triggering option. Glad you like the video! 73!

@RetroRepair 2 ай бұрын

@W6EL Do it! The LA function is why I want this scope so bad, it's a killer app on top of a killer app!

@W6EL 2 ай бұрын

@RetroRepair as soon as I have a need I will give it a go!