Recent Posts

Pages: [1] 2 3 ... 10
1
How to's / Re: Homemade layout fluid
« Last post by krv3000 on Today at 02:49:29 PM »
brill
2
Gallery / Re: 5C Collet Chuck finally in service.
« Last post by krv3000 on Today at 02:48:45 PM »
a job well dun  :ddb:
3
The Water Cooler / Re: car boot sale
« Last post by krv3000 on Today at 02:35:16 PM »
right bin shopping once more 4 hacksaw blades and a file card 1 two scribe handles a universal grinding wheel co. L.T.D  Stafford diamond hand lap on the bottom it has scribed in it 22/2/45 and a model engineer drill gage all for 2 pics 
4
Electronics & IC Programing / Re: Which lathe (err... Scope) Rigol
« Last post by eskoilola on Today at 01:56:37 PM »
Some things that caught my eye on this Keysight thing:

Operating temperature 0 - 50 degrees celcius
This means that some if not all of the components are of consumer grade. This also means that there are some components (probably the display) which will have a short life-span as it is operating at a relatively high temperature already at 21 degrees celcius.

The document does not contain word protection
Building a working protection into a measuring device is not cheap. This probably has one but I would never connect that into anything above 100 volts. Actually I could find out that the maximum input voltage is given at 200V peak-to-peak. Certainlyt not a hobbyist scope - I would turn this into a boat anchor the first day....

Seems like if I buy a new scope today that thing has a life expectancy about 5 years. I would buy a cheap chinese with just enough features and throw it away if/when it start bugging.

Edit: PDF in here.

Edit: for example a Siglent SDS1202X-E

5
Electronics & IC Programing / Re: Which lathe (err... Scope) Rigol
« Last post by PekkaNF on Today at 01:30:00 PM »
Jesh, those are nice relicts, but not rally what I am looking for.

I got some time ago an flyer into my email about keysight economy scopes...I was excited first, but remember seeing economy TEK or R&S scope disassembled next Rigol, showing identical innards. I'm not big fan of Badge engineering.

Keysight boasts big time:
http://www.farnell.com/datasheets/2189548.pdf

How much of that can be trusted on these "cheaper" ones:
http://uk.farnell.com/keysight-technologies/dsox1102a-100mhz-upgrade/digital-storage-osc-100mhz-2-ch/dp/2690194

I never buy options separately. I either get options for free (Rigol has offer now) or pay token fee while ordering, but I really don't like trinket trading. Therefore I'm comparing base-price models.

Like that works out much more expensive and whole lot more limited than equvalent Rigol. How much more I get something tanglible and not just badge?

About same price range TEK spesification is identical to RIGOL:
http://www.farnell.com/datasheets/2239345.pdf

Am I missing something? Do I just upgrade a little with cheapest Rigol that will do now and put balance to "used TEK account when I see one"

Pekka
6
CNC / Re: Electricuting the lead screw
« Last post by eskoilola on Today at 08:59:16 AM »
PK, I assume You are driving You spindle with a servo or a stepper. Not by the normal 3-phase motor.
7
Electronics & IC Programing / Re: Which lathe (err... Scope) Rigol
« Last post by eskoilola on Today at 08:28:00 AM »
I know this will not help You in Your selection.
There has been memory oscilloscopes before the ADC+Memory era. I have seen at least two different approaches and even owned one.
The one I owned was a german Blauschreiber BLS-218. This has some sort of metallic powder that attaches on places where ray has passed. I don't know how that exactly worked but it was a funny device with autorange and 1 MHz bandwidth. 100% vacuum tubes naturally.
Other type has the CRT image stay glowing green until erased with a suitable antipulse. I think Tektronix has made these.

The Blauschreiber is nowdays a real rarity - there are only two samples in existence that the german museum of information is aware of. Mine would have made the third but I actually scrapped it. I am not that nostalgic - it had a great mains transformer for a 500W linear amplifier and a lot of knobs and switches not to talk about the mercuri wetted relays...

Edit: I found a website where this scope is presented here.

In case You german is not treated with rustoleum (mine is so it is not rusty) the page states about the screen that there is a potassium chloride layer on top of a mica plate. When touched by the ray it will turn dark. Erasure is done by heating. I really liked the paper like appearence on that scope.
8
CNC / Re: Electricuting the lead screw
« Last post by PK on Today at 08:20:48 AM »
One pulse per rev.
Here's a video of my CNC lathe conversion turning a 1/8" BSPT thread with ...... wait for it...... a one pulse per rev encoder on the spindle...
9
Electronics & IC Programing / Re: Which lathe (err... Scope) Rigol
« Last post by eskoilola on Today at 08:16:03 AM »
Esko, does you TEK has then TIA input?
To be honest, I am not sure. My previous scope had nuvistrons and this is the next generation right after that period. As I said, a dino ...
My assumption is that there are j-fets buffering the input and thus the static resistance is really big.

And please, do not ask the type, cannot remember and cannot simply walk to my shop since it is over 1000km away "am Momentan".

I know for sure that the inputs can be put into 300V at the most sensitive setting without any damage. I have accidentally measured the anode voltage of some old tube radios with it. It is so easy to forget that the IF coils are directly connected to the anode circuit ...
10
CNC / Re: Electricuting the lead screw
« Last post by AdeV on Today at 08:02:37 AM »
Could you hook something like this encoder up to your spindle? It's massively overkill for your needs (up to 10k pulses/rev, up to 10krpm, not sure if you can do both at the same time...), and at 5v it should hook straight into your MCU setup.
Pages: [1] 2 3 ... 10