Eventhough J309 is a symmetric device (D and S are interchangeable), it should be drawn (i think) as a source follower in that particular circuit.
Had me looking for a rattle on my desk at the end of that video... then I realised that every time you put your arm on the desk, there it was
Dave thank you for an outstanding educational video the time you spent on doing so is well appreciated.Regards to all Waynee
Hang on - on 1X probe I've shoved 200V DC pulse train (@150kHz) into my DS1074Z and I didn't break it on low attenuation band (<200mV/div.) Wouldn't that cause 75R resistor & BAV99 to fail?
So basically: desolder 6 transistors, replace one with a short and you've got the 100MHz model. (per channel of course)
>So basically: desolder 6 transistors, replace one with a short and you've got the 100MHz model. (per channel of course)
Not necessarily - the software may do other things based on its stored knowledge of which model you have.
Excellent technique, very punctual description of the method.
Thank you Dave.
Dave thank you for an outstanding educational video the time you spent on doing so is well appreciated.Regards to all Waynee
Thanks.
This one did take a while.
I have doubts that the RE is correct!
1. The two top NPN in the DIFF DRIVER schematic get no positive base current.
2. The DC-path from the input in the mode w/o attentuator only see 222k+265k instead of 1000k
Because that is a working instrument the RE must be wrong.
Because that is a working instrument the RE must be wrong.
Almost certainly. I haven't checked any of it. My goal was to get the basic topology for the bandwidth limiting, and to show the process.
The in circuit testing info is great! I have often lifed parts to check values, I had no idea that if I kept the voltage low enough on the meter I could get pretty good results even still.
The 1054Zed is gonna be very popular, this REing out of the gate is going to really help the community
The in circuit testing info is great! I have often lifed parts to check values, I had no idea that if I kept the voltage low enough on the meter I could get pretty good results even still.
Depends on the rest of the surrounding circuit. But at least you won't turn on PN junctions (diodes, protection diodes in IC's, transistor, IC inputs etc) with a low test voltage.
Interesting that they appear to have planned the 50MHz version from the start.
(nb. Over in the DS1054Z there are some measurements that show 50MHz filter to be quite sharp, the general opinion was that it was a software filter....but here it is in hardware since day 1)
Somewhere in deepest China an engineer will be cursing Mr Jones this morning. A bandwidth limit using a few transistors as switches should be easy to bypass.
Somewhere in deepest China an engineer will be cursing Mr Jones this morning. A bandwidth limit using a few transistors as switches should be easy to bypass.
You know how I can tell you (and that other guy who figured out a
hardware mod) haven't read the "DS1054Z" thread....?
It's great to see someone explain how they go about doing stuff like this.
I think you said 1052Z instead of 1054Z a few times in the video though.
>So basically: desolder 6 transistors, replace one with a short and you've got the 100MHz model. (per channel of course)
Not necessarily - the software may do other things based on its stored knowledge of which model you have.
Not needed at all, use a keygen, generate a 100MHz key and you are done, no hardware mod necessary.
@ Dave, The scope also has an calibrate modus, this must be connected somewhere along the analog chain per channel.
BTW very much appreciated VIDEO, can become handy if someone blows-up an input channel
Those Rigols will be out of stock very soon.
Those Rigols will be out of stock very soon.
"Soon"?
(luckily I ordered mine the day after it was launched...)
Great tips Dave, much appreciated!