Marco Reps got a black3458B3458A last year from Keysight:
As a kid, I thought we were celebrating that Fawkes had tried to blow up the Houses of Parliament, not the fact that he failed.
The official line, that we celebrate his failure, and the popular view are at variance. I have been known to mutter on recent Nov 5ths "Guido, where are you when your country needs you?".
As a kid, I thought we were celebrating that Fawkes had tried to blow up the Houses of Parliament, not the fact that he failed.
The official line, that we celebrate his failure, and the popular view are at variance. I have been known to mutter on recent Nov 5ths "Guido, where are you when your country needs you?".
In the mid-80s in lat October[1] you could buy a full-size cardboard cutout of Margaret Thatcher. It turned heads when people saw it sitting in the passenger seat of my Land Rover.
As we learned as kids...
Remember remenber the 5th of November
Gunpowder treason and plot
I see no reason why gunpowder treason
Should ever be forgot.
[1] Bonfire night is November 5th.
As a kid, I thought we were celebrating that Fawkes had tried to blow up the Houses of Parliament, not the fact that he failed.
The official line, that we celebrate his failure, and the popular view are at variance. I have been known to mutter on recent Nov 5ths "Guido, where are you when your country needs you?".
In the mid-80s in lat October[1] you could buy a full-size cardboard cutout of Margaret Thatcher. It turned heads when people saw it sitting in the passenger seat of my Land Rover.
As we learned as kids...
Remember remenber the 5th of November
Gunpowder treason and plot
I see no reason why gunpowder treason
Should ever be forgot.
[1] Bonfire night is November 5th.
Did you have a crush on the old girl and have the song "Maggie Mae" on continuous loop?
As a kid, I thought we were celebrating that Fawkes had tried to blow up the Houses of Parliament, not the fact that he failed.
The official line, that we celebrate his failure, and the popular view are at variance. I have been known to mutter on recent Nov 5ths "Guido, where are you when your country needs you?".
As a kid, I thought we were celebrating that Fawkes had tried to blow up the Houses of Parliament, not the fact that he failed.
The official line, that we celebrate his failure, and the popular view are at variance. I have been known to mutter on recent Nov 5ths "Guido, where are you when your country needs you?".
In the mid-80s in lat October[1] you could buy a full-size cardboard cutout of Margaret Thatcher. It turned heads when people saw it sitting in the passenger seat of my Land Rover.
As we learned as kids...
Remember remenber the 5th of November
Gunpowder treason and plot
I see no reason why gunpowder treason
Should ever be forgot.
[1] Bonfire night is November 5th.
Did you have a crush on the old girl and have the song "Maggie Mae" on continuous loop?
Good grief, there are some dumbasses around, just seen this video from Big Clive. I think these people must fall into the category that mnementh talks about.
The dumbasses are the ones putting out those videos, not the ones deciding to have a go IMO.
My reaction at the end of that scene was one of: "Ok - now take it out of the oven. Now."
One of the reasons, why I don't like Mehdi's videos very much. He is sending out the wrong message imo. ("You can get away messing with electricity.")
Yeah I hope that's it. I have just ordered x3 NOS 6AQ5 from Ebay France, so hopefully I shall receive them late next week all going well.
30 Euros shipped. 10 Euros per tube. Not cheap by my wallet standards, but not crazy expensive either, for NOS tubes I mean.
Best deal was 4 NOS ones for 18 Euros shipped, but they come from Ukraine so delivery time, or delivery at all really, is unknown. I don't want to waste 18 Euros down the drain nor wait 3 months to get them
So hoping to get my tubes late next week then. In the meantime I will resume work on the Rochar Nixie DMM I think
How fast are your peek hold meters, can't you expect some results from them?
I am really sorry but I don't understand what you mean ?!
My English is not up to sniff it looks like
Could you rephrase that please ?
An ADG368, an ADG368, my kingdom for an ADG368......
So, dealing with a recalcitrant TDS754D here that apparently lost its cal constants from the EEPROMS (U1052 and U1055) on the acquisition board.
I've had luck replacing them in the past, but this time I can't read or write anything to or from them using the EEPROM/NVRAM read/write utility stuff from somewhere on the forum that I put on floppy disk (It works on another working scope so my disks are good).
I replaced the EEPROMS with brand new ones and then tried writing the cal data from another TDS754D to at least get something force-fed in there but no dice...
So taking a look at the schematic, the EEPROM write control pins are tied to a 74HC86, which receives 5v from the famous 'Write Enable' switch on the processor board, via a 15V to 12V vreg and voltage divider.
All voltages test ok, so I replaced the 74HC86 because it was easy, still no dice. hmmmm.
I have also double checked all traces for continuity, all perfect like the day it was born.
So, the I2C data comes from a 160-pin chip, ADG368. Hmmm, all my spare boards use ADG308 chips. Well, lets get the hot air gun out and swap to see... No boot. Shiet, incompatible.
Swap back and we are booting again but errors are back to square one. So I think the ADG368 chip is most likely the bad bit at this stage (or whatever is feeding the AGD368..) I'll have to scope the I2C lines to the EEPROM chips too, to see if there is activity there.
Now, about finding another ADG368.........
Last resort, pull good EEPROMS full of cal data from a scrapped TDS754D, stick them in and hope it works, if so, call it good.
I also want to rig something up to directly read the data from the old EEPROMs to see if they might actually still be good, maybe something is just stopping the disk utility (and hence the scope) from seeing the data.
How can I do that with the bare chips in my hand? I have a bunch of programmers and chip clips etc but I'm not up with writing and reading directly to I2C chips...
Good grief, there are some dumbasses around, just seen this video from Big Clive. I think these people must fall into the category that mnementh talks about.
As a kid, I thought we were celebrating that Fawkes had tried to blow up the Houses of Parliament, not the fact that he failed.
The official line, that we celebrate his failure, and the popular view are at variance. I have been known to mutter on recent Nov 5ths "Guido, where are you when your country needs you?".
In the mid-80s in lat October[1] you could buy a full-size cardboard cutout of Margaret Thatcher. It turned heads when people saw it sitting in the passenger seat of my Land Rover.
As we learned as kids...
Remember remenber the 5th of November
Gunpowder treason and plot
I see no reason why gunpowder treason
Should ever be forgot.
[1] Bonfire night is November 5th.
Did you have a crush on the old girl and have the song "Maggie Mae" on continuous loop?
I think "Maggie's Farm" would be a more fitting song.
McBryce.
The dumbasses are the ones putting out those videos, not the ones deciding to have a go IMO.Well, you could argue that both are.
The dumbasses are the ones putting out those videos, not the ones deciding to have a go IMO.Well, you could argue that both are.
Maybe. But isn't the whole point of a tutorial/instruction video that you present yourself as someone who knows better than the target audience?
https://www.printables.com/de/model/180580-oscilliscope-probe-organizer
For anyone along the 3DP front, some food for thought - how should this be to fit your scope / desk / workstyle?
I like the idea in general, only immediate flaw is it needs flat, free desk space in front of the scope to open the drawers
As a kid, I thought we were celebrating that Fawkes had tried to blow up the Houses of Parliament, not the fact that he failed.
The official line, that we celebrate his failure, and the popular view are at variance. I have been known to mutter on recent Nov 5ths "Guido, where are you when your country needs you?".
In the mid-80s in lat October[1] you could buy a full-size cardboard cutout of Margaret Thatcher. It turned heads when people saw it sitting in the passenger seat of my Land Rover.
As we learned as kids...
Remember remenber the 5th of November
Gunpowder treason and plot
I see no reason why gunpowder treason
Should ever be forgot.
[1] Bonfire night is November 5th.
Did you have a crush on the old girl and have the song "Maggie Mae" on continuous loop?
I think "Maggie's Farm" would be a more fitting song.
McBryce.Ahem. Politics. Y'all demanded zero-tolerance. I've complied.
At least try not to rub it in my face, please.
mnem
Just say "No, thank you."
An ADG368, an ADG368, my kingdom for an ADG368......
So, dealing with a recalcitrant TDS754D here that apparently lost its cal constants from the EEPROMS (U1052 and U1055) on the acquisition board.
I've had luck replacing them in the past, but this time I can't read or write anything to or from them using the EEPROM/NVRAM read/write utility stuff from somewhere on the forum that I put on floppy disk (It works on another working scope so my disks are good).
I replaced the EEPROMS with brand new ones and then tried writing the cal data from another TDS754D to at least get something force-fed in there but no dice...
So taking a look at the schematic, the EEPROM write control pins are tied to a 74HC86, which receives 5v from the famous 'Write Enable' switch on the processor board, via a 15V to 12V vreg and voltage divider.
All voltages test ok, so I replaced the 74HC86 because it was easy, still no dice. hmmmm.
I have also double checked all traces for continuity, all perfect like the day it was born.
So, the I2C data comes from a 160-pin chip, ADG368. Hmmm, all my spare boards use ADG308 chips. Well, lets get the hot air gun out and swap to see... No boot. Shiet, incompatible.
Swap back and we are booting again but errors are back to square one. So I think the ADG368 chip is most likely the bad bit at this stage (or whatever is feeding the AGD368..) I'll have to scope the I2C lines to the EEPROM chips too, to see if there is activity there.
Now, about finding another ADG368.........
Last resort, pull good EEPROMS full of cal data from a scrapped TDS754D, stick them in and hope it works, if so, call it good.
I also want to rig something up to directly read the data from the old EEPROMs to see if they might actually still be good, maybe something is just stopping the disk utility (and hence the scope) from seeing the data.
How can I do that with the bare chips in my hand? I have a bunch of programmers and chip clips etc but I'm not up with writing and reading directly to I2C chips...
Any idea what that 12V does?
My guess is that some version of NVRAM needed it for writing.