Author Topic: What did you buy today? Post your latest purchase!  (Read 1216050 times)

aargee and 3 Guests are viewing this topic.

Offline technix

  • Super Contributor
  • ***
  • Posts: 2996
  • Country: cn
  • From Shanghai With Love
    • My Untitled Blog
Re: What did you buy today? Post your latest purchase!
« Reply #8500 on: April 18, 2019, 03:11:11 am »
I wonder if there are PXIe to PCIe adapters that accepts a dual slot PCIe card. If so it might be cheaper to buy that plus a gaming graphics card like RTX 2070 or RX 580 than that GPGPU module, while achieving a similar if not better GPGPU performance.

How much would a non-embedded-controller PXIe chassis plus that Thunderbolt 3 card cost? If it is cheaper than an embedded controller one it can be cheaper to add PXIe to an existing lab PC.

A low power PXIe slot can consume and dissipate no more than 38W, and a normal one is not much higher than that. Also, PXI is 100% backplane powered, so there's no 6P/8P connectors provided by the chassis, not the cable management space for you to run the cable. Also, PXI is passively cooled and it expects no fans on its cards in order not to mess with air flow of adjacent cards.

I bought my box for $450 as "for parts not working". It turned to be a minor dust accumulation problem compounded by a dead fan. When the problems were fixed, it went back to life.

A brand new PXIe-8301 would cost $999 from NI, which seems to be high, but is probably the cheapest card you can buy in the PXI world. Getting into the PXI land would need a lot of commitment.

Let's just say it this way. I traded my 6GHz scope with all options for a PXI box made with almost 100% used junk. Only the NI DMM is new. And I ended up spending a few k$ in between.
Sheeeeeesh.

I wonder if there is a USB-based alternative for this? Microsoft has published the USB HID Sensors v2 specification for sending readings back and configuring the modes, but AFAIK few people is using it.

USB based everything is generally cheaper than PCIe too.
 

Offline Specmaster

  • Super Contributor
  • ***
  • Posts: 6594
  • Country: gb
Re: What did you buy today? Post your latest purchase!
« Reply #8501 on: April 18, 2019, 10:44:53 am »
I got this pair of beauties last week in a fairly local auction (4 hours round trip to collect them) and I have before and after clean up pictures. Made in 1988 these are 6.5 digit meters with good specs apart from their speed, they are slow but reliable.





I also purchased today 2 of these filters, 1 for each meter as last night, one of them let out the magic smoke.

Who let Murphy in?
 

Online splin

  • Frequent Contributor
  • **
  • Posts: 671
  • Country: gb
Re: What did you buy today? Post your latest purchase!
« Reply #8502 on: April 19, 2019, 09:43:25 am »
A 7.5 digit DMM, with a twist.



Hey you know the rules - don't plug it in - take it apa-r-r-r-t! And post some piccies  :popcorn:

Seriously though it would be interesting to see what's inside as they are pretty small compared to a conventional DMM - the power supply is external but it will still need an internal isolated DC - DC convertor.

On which point the documentation keeps referring to the 'Isolated Digitizer' which seems odd as the DVM has to be isolated surely - the spec says 1000V max voltage from Hi terminal to ground? Is it simply trying to distinguish itself from typical DAQ/digitizers which aren't isolated perhaps?

The documentation seems very poor, or at least I couldn't find a proper reference manual, only the datasheet and a getting started user manual.
 

Offline blueskull

  • Supporter
  • ****
  • Posts: 11319
  • Country: cn
  • Power Electronics Guy
Re: What did you buy today? Post your latest purchase!
« Reply #8503 on: April 19, 2019, 07:38:39 pm »
Yes, it has an isolation xfmr. I think it's a push pull converter.

A teardown was made, and I'm still cutting the video.

Ordered today is a keysight m9371a vna. I will do a teardown of it as well if it's easy to get into it. I don't want to use any brute force since I can't calibrate it after if I nudge some magic parts a few hair thicks away.
 
The following users thanked this post: thm_w, splin

Online splin

  • Frequent Contributor
  • **
  • Posts: 671
  • Country: gb
Re: What did you buy today? Post your latest purchase!
« Reply #8504 on: April 19, 2019, 09:21:25 pm »
Yes, it has an isolation xfmr. I think it's a push pull converter.

A teardown was made, and I'm still cutting the video.

Great!  Look forward to it.   :-+
 

Offline Specmaster

  • Super Contributor
  • ***
  • Posts: 6594
  • Country: gb
Re: What did you buy today? Post your latest purchase!
« Reply #8505 on: April 20, 2019, 08:09:58 am »
In keeping with the rules of taking it apart here are some photos of my 7150 plus meters in the nude...porno style....


Who let Murphy in?
 

Offline blueskull

  • Supporter
  • ****
  • Posts: 11319
  • Country: cn
  • Power Electronics Guy
Re: What did you buy today? Post your latest purchase!
« Reply #8506 on: April 21, 2019, 08:09:10 pm »
A gray Rust-oleum primer+paint 2-in-1 spray can.

Gave my NI PXI box a Keysight look and feel.



And two 60mm fans, one for o'scope cards (I dumbed down the built-in fans), one for the fanless PSU.
 
The following users thanked this post: TiN

Offline gamalot

  • Frequent Contributor
  • **
  • Posts: 459
  • Country: au
  • Correct my English
    • GAMALOT
Re: What did you buy today? Post your latest purchase!
« Reply #8507 on: April 21, 2019, 10:40:06 pm »
A gray Rust-oleum primer+paint 2-in-1 spray can.

Gave my NI PXI box a Keysight look and feel.



And two 60mm fans, one for o'scope cards (I dumbed down the built-in fans), one for the fanless PSU.

Noctua?
 

Offline blueskull

  • Supporter
  • ****
  • Posts: 11319
  • Country: cn
  • Power Electronics Guy
Re: What did you buy today? Post your latest purchase!
« Reply #8508 on: April 22, 2019, 06:53:21 am »
Noctua?

2 Noctua 120mm fans running at 75% duty cycle for cooling all PXI cards, 1 Noctua 60mm fan for cooling the PSU, 1 Noctua 60mm fan for cooling the scope module.
ATM the two 60mm fans are running at 100% duty cycle, but I will dumb them a bit down with a resistor for each. Too bad they don't have PWM support.

I used a PSoC board to tap into the SMBus of the chassis, and I can control the 120mm fan speed in a home brew software.
The fan project turned out to be a fun project. The original 120mm fans were very noisy, and anyway one was dead on arrival, so I replaced both.
Since last time I sold my desktop PC part by part, I had some leftovers, which include 2 Noctua 120mm fans, and I finally found a use for them.

The fan controller spits a fake tachometer output to prevent the chassis from powering off automatically (the Noctua fans' RPM is not enough), and it reads in the real tach output from the fans.
If the real tach falls below certain value, it stops the fake tach output to allow system to be powered off automatically to prevent over heating.

I then added I2C support to set RPM protection threshold and speed for the 120mm fans, and I am going to add close loop control based on temperature, tach input and PWM output.
Simple 2 loop system, with the outer loop being an inverse P controller, regulating reference RPM based on temperature, and the inner loop being a PI controller, regulating PWM based on RPM input and RPM reference from the outer loop.

I finally had a chance to use my full bag of leftover LMT01 sensors as a bonus.
 

Offline Shock

  • Super Contributor
  • ***
  • Posts: 2549
  • Country: au
Re: What did you buy today? Post your latest purchase!
« Reply #8509 on: April 22, 2019, 02:51:40 pm »
Specmaster is that stock? That connector looks very ghetto.



Soldering/Rework: Pace ADS200, Pace MBT350
Multimeters: Fluke 87V, 117, 27/FM
Oscilloscopes: Rigol DS1054Z, Phillips PM3065
 

Offline Specmaster

  • Super Contributor
  • ***
  • Posts: 6594
  • Country: gb
Re: What did you buy today? Post your latest purchase!
« Reply #8510 on: April 22, 2019, 04:19:19 pm »
Specmaster is that stock? That connector looks very ghetto.


It's stock but it's really OK, the connector is actually a multipole switch that is mounted on the front panel as the "Plus" model also has rear mounted sockets and the switch switches the inputs between front and  rear sockets.

Sent from my POT-LX1 using Tapatalk

Who let Murphy in?
 

Offline Specmaster

  • Super Contributor
  • ***
  • Posts: 6594
  • Country: gb
Re: What did you buy today? Post your latest purchase!
« Reply #8511 on: April 22, 2019, 04:25:01 pm »
Specmaster is that stock? That connector looks very ghetto.


It's stock but it's really OK, the connector is actually a multipole switch that is mounted on the front panel as the "Plus" model also has rear mounted sockets and the switch switches the inputs between front and  rear sockets.

Sent from my POT-LX1 using Tapatalk
I don't think it was considered when the first model 7150 was designed but was asked for by customers so added in and called "7150 PLUS". Because of the original design, the only way to add it was mount the switch off the front panel.

Sent from my POT-LX1 using Tapatalk

Who let Murphy in?
 

Offline Falkra

  • Regular Contributor
  • *
  • Posts: 162
  • Country: fr
Re: What did you buy today? Post your latest purchase!
« Reply #8512 on: April 22, 2019, 08:03:02 pm »

I also purchased today 2 of these filters, 1 for each meter as last night, one of them let out the magic smoke.



That filter is a common issue on that meter, I also own one (with LCD backlight added).
Have fun, it's a very nice 6 digits meter.  :-+
 

Offline Specmaster

  • Super Contributor
  • ***
  • Posts: 6594
  • Country: gb
Re: What did you buy today? Post your latest purchase!
« Reply #8513 on: April 22, 2019, 08:44:38 pm »

I also purchased today 2 of these filters, 1 for each meter as last night, one of them let out the magic smoke.



That filter is a common issue on that meter, I also own one (with LCD backlight added).
Have fun, it's a very nice 6 digits meter.  :-+
The 7150s should already have edge lit LCDs, mine have but very weak, replacing LEDs with very bright white LEDs soon.

Sent from my POT-LX1 using Tapatalk

Who let Murphy in?
 

Online beanflying

  • Super Contributor
  • ***
  • Posts: 2964
  • Country: au
  • Toys so very many Toys.
Re: What did you buy today? Post your latest purchase!
« Reply #8514 on: April 22, 2019, 08:51:15 pm »
Nearly $100 of 1% M-GOhm resistors. Some for the HV probe project and the rest for binary decades from 1M on up to G.
Coffee, Food, R/C and electronics nerd in no particular order :)
 

Offline TERRA Operative

  • Frequent Contributor
  • **
  • Posts: 519
  • Country: jp
  • Voider of warranties
    • Near Far Media Youtube
Re: What did you buy today? Post your latest purchase!
« Reply #8515 on: April 23, 2019, 01:56:45 am »
Hit Akihabara today and found a 'Leap' brand Leaper-3 EPROM Programmer in almost mint condition for 2700yen

Also picked up a Panasonic CRT that was pulled from some CRO to add to my collection.
Any circuit design must contain at least one part which is obsolete, two parts which are unobtainable, and three parts which are still under development.

http://www.youtube.com/user/NearFarMedia/
 

Offline blueskull

  • Supporter
  • ****
  • Posts: 11319
  • Country: cn
  • Power Electronics Guy
Re: What did you buy today? Post your latest purchase!
« Reply #8516 on: April 23, 2019, 04:01:16 am »
Hit Akihabara today and found a 'Leap' brand Leaper-3 EPROM Programmer in almost mint condition for 2700yen

Also picked up a Panasonic CRT that was pulled from some CRO to add to my collection.

Is that... A floppy disk in the CD pouch?
 

Offline TERRA Operative

  • Frequent Contributor
  • **
  • Posts: 519
  • Country: jp
  • Voider of warranties
    • Near Far Media Youtube
Re: What did you buy today? Post your latest purchase!
« Reply #8517 on: April 23, 2019, 08:58:59 am »
Yeah. :D
This thing is old enough to be supplied with a floppy and CD. My laptop has neither! :D
I have an external USB DVD drive and Leap have the software for download too. My laptop dock also has a proper serial and parallel ports as well, so I'll have to fire it up soon to see if it actually works under Win10...
Any circuit design must contain at least one part which is obsolete, two parts which are unobtainable, and three parts which are still under development.

http://www.youtube.com/user/NearFarMedia/
 

Offline TerraHertz

  • Super Contributor
  • ***
  • Posts: 3530
  • Country: au
  • Why shouldn't we question everything?
    • It's not really a Blog
Re: What did you buy today? Post your latest purchase!
« Reply #8518 on: April 23, 2019, 01:37:09 pm »

Some paper books:

PDF Explained
Author: John Whitington

Developing with PDF: Dive Into the Portable Document Format
Author: Leonard Rosenthol

How JavaScript Works
Author: Douglas Crockford

DOM Enlightenment
Author: Cody Lindley

In addition to an ongoing download quest for texts/tutorials/standards on AJAX, Converse, Countable, DOM, ECMAScript, Electron-js, Grunt, jQuery, JSLint, JSON, Mathjax, Node-js, NPM, Sizzle, TypeScript, WebKit, etc. Like drinking from a fire hose.
Can anyone recommend their favorite sites/texts on this topic? (Browser-based front-end programming)

Btw, I suck at torrents and the P-word searching. Can anyone drop some hints on where I might find free copies of the stupidly expensive ISO standards related to PDF /A /E /U variants?
See attached PDF_list.zip (It's just the index from my folder of PDF docs. Also incomplete; I still have to include a bunch of errata notes and other small docs from an Adobe page:  https://www.adobe.com/devnet/pdf/pdf_reference.html)
« Last Edit: April 23, 2019, 01:42:30 pm by TerraHertz »
Collecting old scopes, logic analyzers, and unfinished projects. http://everist.org
 

Online McBryce

  • Super Contributor
  • ***
  • Posts: 1224
  • Country: de
Re: What did you buy today? Post your latest purchase!
« Reply #8519 on: April 23, 2019, 04:52:42 pm »
There's something strangely the wrong way around when you're explaining PDF in a paper book. :D

McBryce.
 
The following users thanked this post: odessa

Offline maginnovision

  • Frequent Contributor
  • **
  • Posts: 635
  • Country: us
Re: What did you buy today? Post your latest purchase!
« Reply #8520 on: April 23, 2019, 05:05:14 pm »
There's something strangely the wrong way around when you're explaining PDF in a paper book. :D

McBryce.

Gotta start somewhere.
 

Offline BU508A

  • Frequent Contributor
  • **
  • Posts: 416
  • Country: de
Re: What did you buy today? Post your latest purchase!
« Reply #8521 on: April 24, 2019, 06:29:02 am »
Got one of these nice Makita vacuum cleaner:

https://www.makitatools.com/products/details/XCV11T

But in my case it cames with only one Li-Ion battery and with no charger (have one already)

“Chaos is found in greatest abundance wherever order is being sought. It always defeats order, because it is better organized.”            - Terry Pratchett -
 

Offline rsjsouza

  • Super Contributor
  • ***
  • Posts: 3034
  • Country: us
    • Vbe - vídeo blog eletrônico
Re: What did you buy today? Post your latest purchase!
« Reply #8522 on: April 24, 2019, 07:14:02 am »
A small helper for my old and new digital designs. A Kingst LA2012 shipped very fast by this seller and a few coupons helped seal the deal.

It works really well and the SW is somewhat basic but very responsive.
Vbe - vídeo blog eletrônico http://videos.vbeletronico.com

Oh, the "whys" of the datasheets... The information is there not to be an axiomatic truth, but instead each speck of data must be slowly inhaled while carefully performing a deep search inside oneself to find the true metaphysical sense...
 

Offline TerraHertz

  • Super Contributor
  • ***
  • Posts: 3530
  • Country: au
  • Why shouldn't we question everything?
    • It's not really a Blog
Re: What did you buy today? Post your latest purchase!
« Reply #8523 on: April 24, 2019, 09:16:45 am »
There's something strangely the wrong way around when you're explaining PDF in a paper book. :D

Only if you believe PDF and e-texts in general are ergonomically and philosophically superior to physical texts. Imo it's like med-school autopsies - the more nice clean paper texts and the less handling of stinky, contageous putrescent PDF binary flesh, the better. This is partly for a project to write a PDF structure dissector.  Because amazingly, there doesn't seem to be a decent freeware one around.

For all the PDF-fans, here's a nice read:
  https://blog.zynamics.com/2010/06/09/analyzing-the-currently-exploited-0-day-for-adobe-reader-and-adobe-flash/
  A brief analysis of a malicious PDF file which exploits this week's Flash 0-day
Collecting old scopes, logic analyzers, and unfinished projects. http://everist.org
 

Online GreyWoolfe

  • Super Contributor
  • ***
  • Posts: 3086
  • Country: us
  • NW0LF
Re: What did you buy today? Post your latest purchase!
« Reply #8524 on: April 24, 2019, 10:33:44 am »
Picked up this little beauty.  It is a Seth Thomas WWII vintage U.S. Maritime Commission wall clock.  It is a bit rough around the edges but it does work and keep time.  I am visiting the local jeweler who restores old clocks to get some advice on a simple clean up.  I don't want nor can afford a full restoration.  I just want to clean it up a little.  From what little I have looked, it has a waterproof bakelite case so it could have served on land or sea.

EDIT: I took a better picture, didn't realize how dirty the glass was so I cleaned it up a bit.



« Last Edit: April 24, 2019, 11:02:22 am by GreyWoolfe »
That which doesn't kill you still requires a co-pay.
 
The following users thanked this post: bitseeker


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf