Products > Test Equipment
Keysight 3000T scope 1 GHz(or more) hardware upgrade mod
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badbiki:
Lifted one pad on a removed relay... could patch if going backwards but otherwise alll relaysbin.

Kapton tape and insulation pads from  3D printer hot ends works well. Make wrap around a for the protecteded relays and a lifted one for the removal. Easy.

Not good enough to reuse but don’t damage the remaining relay :)

More tomorrow.
badbiki:
MOd complete :) spent hours cleaning residue from all the traces and components.... so many hours!

I matched the 27.5 ohm resistors in pairs between 3 and 9mOhm difference. I would think it would be wise to also match the mirrored capacitors also, and match the mirrored inductors per channel.

Ideally I would have also bought more of C1 and C2 to match filter frequencies between channels. However it was late and I didn’t have a good 4wire measurement system setup for 0603/0805 passives. I’ll revise my BOM above and purhaps post my annotated drawings which print well on B&W and show movements/removals.

I’ll take it to my friends RF lab soon to check each channel at high frequencies. So far the user calibration passes so long as my cables T out to 1,3 and 2,4 otherwise it failed the first time.

Top hacking :)
Samogon:
To measure 1pF caps is a big deal, not many systems could do it.
badbiki:
I had a very quick hookup using a Rigol 70kHz-3.2GHz spectrum analyser set on 0dBm with each channel terminating into 50ohm with a 400mm BNC to SMA cable. Too quickly as I was rushing out the door to get home.

I will setup better for it next time to do a sweep up the frequency range and perform a segmented capture across the MHz and into the GHz.

Ch/Freq1GHz (mVpp)1.5GHz (mVpp)1GHz (dBm)1.5GHz (dBm)Ch1562.21145.34-1.02-12.77Ch2491.96125.38-2.18-14.06Ch3481.91128.14-2.36-13.87Ch4511.3120.653-1.85-29.72
I have a feeling that the last entry I captured was not setup correctly

I should have had this set as 3.97940 dBm for a clean 1Vpp signal.

I read a 1.699-1.718ns rise time on the trigger output with ~200MHz bandwidth measurement with Math FFT(d/d(t)).
maxwell3e10:
Not exactly on topic, but I've been collecting shorted input noise spectra for various oscilloscope in this thread:https://www.eevblog.com/forum/testgear/oscilloscope-input-noise-comparison/

So far R&S RTM3000 is the winner, so to be fair we need some data from a Keysight 3000 series scope. It would also be interesting to compare the noise for mod and non-mod versions.
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