BTW, what do you think about these C-L-R networks? Are they some kind of feedback paths? I don't think they are direct signal paths.
They are balanced filters, as opposed to single ended ones.
Also, did you notice difference in MarkL's 1GHz AA filter?
Hmm, that's a bit scary. It seems unlikely to be a simple upgrade to 1GHz in that case. 1GHz on a HiZ input is of little value, most high speed probing systems are 50 ohm.
They use a kind of parallel path C-R path in addition to usual LC ladder scheme.
It looks like it's just trying to boost the HF end a bit. What's nice to see is that they do what I do in these situations with lumped filters, model a reasonable attempt but leave plenty of optional pads for improvement after the spin for the real world.
Before I disassemble the scope and lift the shield again, can you identify all the parts you need to know?
Lifting the shield isn't hard but it's a bit fiddly and time consuming as the gap between shields doesn't leave much room to get a decent amount of localised heat on the mounting joints.
Before I disassemble the scope and lift the shield again, can you identify all the parts you need to know?
Hmm, should I be greedy or conservative?
Please look at attached photos. Red dots are for possibly critical components, yellow it for just interesting.
Top layer: 5 red, 4 yellow.
Bot layer: 4 red, 3 yellow.
Fell free to discard yellow comps if that would take too much time.
Thanks in advance!
How are you starting the firmware, and what version? Do you have a LAN card so you can telnet into the unit?
ATM I don't have a LAN and my FW is 2.41.
I've never touched the software part yet.
I think I'll replicate most of the values from your photos on one of the channel and try to directly measure ASIC output bandwidth with another scope. I don't think the ASIC itself could be digitally controlled for BW limit.
I'm not too averse to desoldering to measure, I have a pretty decent E12 stock of Ls (WW as well as ML), Cs and Rs in stock if necessary. In the event of disaster, there's always another channel ;-)
Nice! You seem to have a great reverser's setup. Although I feel I maybe asking too much about desoldering.
I don't think inductors needed be measured since they are marked and you can tell their value by both marks and number of wire turns. But capacitors are real headache. I can't measure single pF's accurately.
BTW, what do you think about these C-L-R networks? Are they some kind of feedback paths? I don't think they are direct signal paths.
Also, did you notice difference in MarkL's 1GHz AA filter? They use a kind of parallel path C-R path in addition to usual LC ladder scheme.
I think you need to get a LAN card - you could then easily switch between 100 and 200 MHz bandwidth and probe to see where the bandwidth is actually changing.
I think you need to get a LAN card - you could then easily switch between 100 and 200 MHz bandwidth and probe to see where the bandwidth is actually changing.
I expect to make a DIY board in a week.
WOW, thanks guys for this thread resurrection, quite amazing findings.
How are you starting the firmware, and what version? Do you have a LAN card so you can telnet into the unit?
ATM I don't have a LAN and my FW is 2.41.
I've never touched the software part yet.
I think I'll replicate most of the values from your photos on one of the channel and try to directly measure ASIC output bandwidth with another scope. I don't think the ASIC itself could be digitally controlled for BW limit.
I'm not too averse to desoldering to measure, I have a pretty decent E12 stock of Ls (WW as well as ML), Cs and Rs in stock if necessary. In the event of disaster, there's always another channel ;-)
Nice! You seem to have a great reverser's setup. Although I feel I maybe asking too much about desoldering.
I don't think inductors needed be measured since they are marked and you can tell their value by both marks and number of wire turns. But capacitors are real headache. I can't measure single pF's accurately.
BTW, what do you think about these C-L-R networks? Are they some kind of feedback paths? I don't think they are direct signal paths.
Also, did you notice difference in MarkL's 1GHz AA filter? They use a kind of parallel path C-R path in addition to usual LC ladder scheme.
I think you need to get a LAN card - you could then easily switch between 100 and 200 MHz bandwidth and probe to see where the bandwidth is actually changing.
How do you switch from 100 to 200Mhz with a LAN card?
How do you switch from 100 to 200Mhz with a LAN card?
there are BW comandline parameters, for instance BW50 switch bandwidth to 500MHz.
Will try my best to get to it in the next two days
Can confirm that this is definitely the case. There's a hardware difference.
Not sure if I have the right to ask, but I'll try
What's the difference between factory and user calibration for 3000-series? Do I need to use high-grade BNC cables and fixtures for user calibration? How critical are they?
Are there any factory-only calibrations I can ruin so hard so user calibration won't help to recover accuracy?
Ok, I took my Agilent MSOX-3104A apart
Here are the pictures.
Is this what you are looking for?
Any details I need to look for?
Anything in detail that needs to be taking pictures of?
And more....
By removing the can, I think I lifted one of the ground pads.
Solderwick did not help to remove all the solder
I had to add some leaded solder to make it flow easier
Hopefully this is not a problem for the re-Assembly
And here are some details from under the can.
And here are some details from under the can.
Thank you!
Could you please confirm top marking on this SOT-23 device (see attachment)?
Looking at my own pictures, I am surprised how many fibers are hanging there on the components.
More details
Amazing! Thank you!
Looks like it would be possible to boost any board to 1GHz. This will require building of additional circuit around Teledyne attenuator relay.
So, I can re-assemble my scope?
Or do you need anything else, while it is open
So, I can re-assemble my scope?
Or do you need anything else, while it is open
Sure. I don't think anything else is needed.
Thank you very much for your help!