Products > Test Equipment

New toy(?) scope Fnirsi DPOX180H, claimed 180MHz/500MSps (May 2023)

<< < (93/113) > >>

csuhi17:
I have already tried, if there is noise, it should not occur at 10V/Div sensitivity, and the error only occurs if the above conditions are met.
By moving the baseline lower, the error is eliminated.

My fast edge generator arrived today, 50kHz 180ps rise time, 300Vrms. 300mVrms.

Direct BNC connection, I don't have to fiddle with the wire.
It's a bit tricky because you can't screw it onto the connector because it's countersunk, but fortunately the contact is good.

I tried it with AUTO trigger and in Single, unfortunately it didn't work as I wanted.

The rise time, if I managed to get it right, is 2.8ns at best, based on 0.35/rise time = 125Mhz.
My TO1104 gave the same result.

Could it be a result of replacing the capacitor? Kerry Wong got 1.8ns.

The other picture is with STO2202C.

battlecoder:

--- Quote from: csuhi17 on October 03, 2023, 09:23:21 am ---I have already tried, if there is noise, it should not occur at 10V/Div sensitivity, and the error only occurs if the above conditions are met.
By moving the baseline lower, the error is eliminated.

My fast edge generator arrived today, 50kHz 180ps rise time, 300Vrms.

Direct BNC connection, I don't have to fiddle with the wire.
It's a bit tricky because you can't screw it onto the connector because it's countersunk, but fortunately the contact is good.

I tried it with AUTO trigger and in Single, unfortunately it didn't work as I wanted.

The rise time, if I managed to get it right, is 2.8ns at best, based on 0.35/rise time = 125Mhz.
My TO1104 gave the same result.

Could it be a result of replacing the capacitor? Kerry Wong got 1.8ns.

The other picture is with STO2202C.

--- End quote ---
To rule out the capacitor as the culprit for this result, you can just set the CH1 coupling to DC (the capacitor was, supposedly, the AC blocking capacitor so shouldn't be part of the circuit when set to DC).
Having said that, considering the lack of horizontal timebase resolution, and the fact that rise-time measurement has to be done by hand with cursors over a span of a handful of pixels, I don't think we can get any real bandwidth measurement this way.

I tried with mine, and got somewhere in the vicinity of 150Mhz, for example. Keep also in mind that the probe could be affecting the result. I assume that you used the supplied probe in x10 (because I don't think it would've been wise to connect 300Vrms directly with a coax), and that probe, in my opinion, is not great. In my admittedly limited testing, it looks very non-linear over the 200Mhz range that should cover. If you sweep a generator over that range, you will see the amplitude go up and down by a considerable margin (or at least mine do).

csuhi17:
It behaves in the same way in AC and DC mode, I managed to find out based on many tests.
voltage sensitivity does not matter.
The first two are that the trigger is set to single shoot and falling edge.

The third is that only one channel should be active.

The fourth is that the base line should be in the top 4 pieces /Div, that is, the middle line and above. with the ORIG button, e.g.

The fifth is that the trigger line should be above the base line.

The sixth is the time setting.
5ns-50ns 200ns, 2us

It does it almost all the time at 5ns-50ns and 200ns.

It is probably what you wrote that something remains in my memory and triggers it, but that signal is not visible on the display.

I did not use a cable, it is connected directly to the BNC input.

Oops, sorry, not 300Vrms but 300mVrms.

solidhit:
The new version v40 of the firmware has been uploaded to the official FNIRSI support page.

battlecoder:

--- Quote from: solidhit on October 04, 2023, 10:50:30 pm ---The new version v40 of the firmware has been uploaded to the official FNIRSI support page.

--- End quote ---
Thanks for the heads up. I ran a binary comparison between the file on FNIRSI's website, and the one that was posted in this thread, and they are identical.

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod