Author Topic: What's this please? (Component Advice)  (Read 537475 times)

0 Members and 1 Guest are viewing this topic.

Offline Richard Crowley

  • Super Contributor
  • ***
  • Posts: 4310
  • Country: us
  • KE7GKP
Re: What's this please? (Component Advice)
« Reply #875 on: November 14, 2015, 05:33:37 pm »
Yes, it certainly looks like a film resistor.
The resistance is the coating on the surface of the ceramic "plug".
The "slots" are probably where they "trimmed" the value with a laser.

You didn't mention WHY you removed it? (Or why you destroyed it?)
You can't tell the value (1K vs 3K3 or any other value) by looking at it.
Didn't you measure it?  Why would you think it is "1K"?
If the document says 3K3, then why would you want to put anything else in there?
 

Offline nicknails

  • Contributor
  • Posts: 42
Re: What's this please? (Component Advice)
« Reply #876 on: November 14, 2015, 06:17:17 pm »
I have 4 Fluke 45's that were all damaged by either high voltage on the input or some sort of weird ground noise from testing a HV DC/DC converter. On a good Fluke 45, this measures 1K-Ohm dead nuts (in circuit). I took it apart because a good one measures 1K, but the diagram shows 3.3K.

I've attached the schematic and the parts list. Offending part is R5.
 

Offline Richard Crowley

  • Super Contributor
  • ***
  • Posts: 4310
  • Country: us
  • KE7GKP
Re: What's this please? (Component Advice)
« Reply #877 on: November 14, 2015, 07:14:19 pm »
I don't see "3.3K" anywhere in the parts list. I see R5 shown as 3.5K
I also see that R5 and RT1 appear to have been hand-altered after the diagram was published.
Perhaps you have the wrong schematic for your make/model/serial number.
 

Offline jitter

  • Frequent Contributor
  • **
  • Posts: 804
  • Country: nl
Re: What's this please? (Component Advice)
« Reply #878 on: November 15, 2015, 01:54:17 pm »
I have 4 Fluke 45's that were all damaged by either high voltage on the input or some sort of weird ground noise from testing a HV DC/DC converter. On a good Fluke 45, this measures 1K-Ohm dead nuts (in circuit). I took it apart because a good one measures 1K, but the diagram shows 3.3K.

I've attached the schematic and the parts list. Offending part is R5.

What is the colour code of the resistor in the good Fluke 45?
 

Offline nicknails

  • Contributor
  • Posts: 42
Re: What's this please? (Component Advice)
« Reply #879 on: November 16, 2015, 05:13:04 pm »
I don't see "3.3K" anywhere in the parts list. I see R5 shown as 3.5K
I also see that R5 and RT1 appear to have been hand-altered after the diagram was published.
Perhaps you have the wrong schematic for your make/model/serial number.

Oops. I meant to say 3.5K, not sure why I have 3.3K stuck in my head. Nearest I can tell is that there's only the one schematic.


What is the colour code of the resistor in the good Fluke 45?


The good one is the same on the outside. It has a blue stripe and a green stripe just like the original picture.
 

Offline uoficowboy

  • Regular Contributor
  • *
  • Posts: 186
  • Country: us
Re: What's this please? (Component Advice)
« Reply #880 on: January 08, 2016, 07:37:28 pm »
I recently got a Kikusui PLZ150W load on Ebay. It's missing one of the plastic nut things on the terminals on the front. Picture attached.

Anybody know where I can get another one? For size, it's compatible with a 4mm banana jack. Not sure about the thread size but I can probably figure it out of needed.
 

Offline Yansi

  • Super Contributor
  • ***
  • Posts: 3281
  • Country: 00
  • STM32, STM8, AVR, 8051
Re: What's this please? (Component Advice)
« Reply #881 on: January 08, 2016, 09:07:38 pm »
Get a pair of new ones that will fit. This type of thing is not usually sold in pieces, not these cheapies at all.
 

Offline Alexei.Polkhanov

  • Frequent Contributor
  • **
  • Posts: 683
  • Country: ca
Re: What's this please? (Component Advice)
« Reply #882 on: January 09, 2016, 05:17:48 am »
Find one of these BNC-to-banana adapters and I think that plastic thing that is on it will fit your load. Perhaps you can find one that will fit just by looking at photos on whichever site you buy it from.

 

Offline jitter

  • Frequent Contributor
  • **
  • Posts: 804
  • Country: nl
Re: What's this please? (Component Advice)
« Reply #883 on: January 09, 2016, 09:01:06 am »
They're called "pole terminal". Any electronics store/webshop should have them in different quality grades.

« Last Edit: January 09, 2016, 09:05:35 am by jitter »
 

Offline nadien

  • Contributor
  • !
  • Posts: 5
  • Country: ky
Re: What's this please? (Component Advice)
« Reply #884 on: January 10, 2016, 06:11:54 pm »
12R cood
 

Offline alsetalokin4017

  • Super Contributor
  • ***
  • Posts: 1962
  • Country: us
Re: What's this please? (Component Advice)
« Reply #885 on: January 10, 2016, 08:52:47 pm »
Get a pair of new ones that will fit. This type of thing is not usually sold in pieces, not these cheapies at all.

This ^.

There are so many different brands, manufacturers, etc. that it is unlikely that you will be able to match the thread from a "random" part to fit your particular banana jack terminal. Unless you know someone who is parting out that same power supply model.... unlikely.

Get a pair of new ones (the entire assembly) that will fit.
The easiest person to fool is yourself. -- Richard Feynman
 

Offline DG41WV

  • Regular Contributor
  • *
  • Posts: 51
  • Country: lk
Re: What's this please? (Component Advice)
« Reply #886 on: January 14, 2016, 12:39:36 pm »
This fuse like thing was in an Anritsu voltmeter. anyone know what it is ?

 

Offline Codemonkey

  • Regular Contributor
  • *
  • Posts: 223
  • Country: gb
Re: What's this please? (Component Advice)
« Reply #887 on: January 14, 2016, 12:46:57 pm »
Its as the marking on the panel implies, its an elapsed time indicator, not a fuse:

Discussion of something similar here (scroll down)

http://www.forum.radios-tv.co.uk/viewtopic.php?f=20&t=4861

http://www.forum.radios-tv.co.uk/download/file.php?id=9382&sid=edf1198a99128074e6af309fa2528d3d&mode=view
 

Online PA0PBZ

  • Super Contributor
  • ***
  • Posts: 4342
  • Country: nl
Re: What's this please? (Component Advice)
« Reply #888 on: January 14, 2016, 12:47:36 pm »
This fuse like thing was in an Anritsu voltmeter. anyone know what it is ?

Hint: it is labeled exactly as it is right above...
Keyboard error: Press F1 to continue.
 

Offline albert22

  • Regular Contributor
  • *
  • Posts: 177
Re: What's this please? (Component Advice)
« Reply #889 on: January 14, 2016, 02:19:58 pm »
More info on the elapsed timer. Here:
 

Offline Godzil

  • Frequent Contributor
  • **
  • Posts: 458
  • Country: fr
    • My own blog
Re: What's this please? (Component Advice)
« Reply #890 on: January 14, 2016, 07:35:19 pm »
So I finally took time to take a picture of the weird components in the farnell power supply I get (LS 30-10)

From the component silkscreen, they are Tx like the two transformer, but I found the shape a bit strange, anyone has info on them?

Edit: with picture it's even better :D





Edit2: By the way, if any one have the documentation/schematics that was given with this power supply, I would be really please if you can share. The only thing I found was that: http://www.ioffer.com/i/farnell-ls30-10-power-supply-schematic-circuit-diagram-522130208 but I don't really want to pay something dubious, and especially because if was given for free with the power supply (I want to check if the low rampup time is due to the capacitors, that are may going to fail, or if it's normal)
(Ho, the big caps there seems to be rubycon one, yummy :))
« Last Edit: January 14, 2016, 07:50:32 pm by Godzil »
When you make hardware without taking into account the needs of the eventual software developers, you end up with bloated hardware full of pointless excess. From the outset one must consider design from both a hardware and software perspective.
-- Yokoi Gunpei
 

Offline Richard Crowley

  • Super Contributor
  • ***
  • Posts: 4310
  • Country: us
  • KE7GKP
Re: What's this please? (Component Advice)
« Reply #891 on: January 14, 2016, 09:44:39 pm »
If they have more than two terminals, then they are almost certainly transformers. And if only two, then they are inductors.
In either case it seems quite unlikely that they have any significant failure mode (at least without a dozen other components also failing).

It looks like a switch-mode power-supply (SMPS).  Slow ramp-up time seems like an early warning of imminent failure.  Unless it was specifically designed that way for whatever purpose in the larger picture.

SMPS are generally quite difficult to repair, even WITH the schematic diagram.  Most of us just replace the entire SMPS with a new one because they are much cheaper to replace than to repair.
 

Offline Godzil

  • Frequent Contributor
  • **
  • Posts: 458
  • Country: fr
    • My own blog
What's this please? (Component Advice)
« Reply #892 on: January 14, 2016, 09:54:08 pm »
That would be sad, it's a nearly 30year old power supply :( (in good conditions)

The initial rise time is not that bad, it's more when changing the current limiter or the voltage output that it is a bit slow, it's maybe inherent to this power supply)
« Last Edit: January 14, 2016, 10:03:44 pm by Godzil »
When you make hardware without taking into account the needs of the eventual software developers, you end up with bloated hardware full of pointless excess. From the outset one must consider design from both a hardware and software perspective.
-- Yokoi Gunpei
 

Offline RobertoLG

  • Frequent Contributor
  • **
  • Posts: 361
  • Country: br
Re: What's this please? (Component Advice)
« Reply #893 on: February 05, 2016, 04:33:19 am »
hello I need some advice about this diode, I need to find a modern equivalent, It says at the body T 3D 0j, nothing else, I googled it but can't find anything, sorry for the bad pictures they are the best I can take, if somebody can help thanks
 

Offline Cubdriver

  • Supporter
  • ****
  • Posts: 2872
  • Country: us
  • Nixie addict
    • Photos of electronic gear
Re: What's this please? (Component Advice)
« Reply #894 on: February 05, 2016, 04:41:30 am »
What is it from/ what is its purpose?  Rectifier, something else? 

-Pat
If it jams, force it.  If it breaks, you needed a new one anyway...
 

Offline Richard Crowley

  • Super Contributor
  • ***
  • Posts: 4310
  • Country: us
  • KE7GKP
Re: What's this please? (Component Advice)
« Reply #895 on: February 05, 2016, 04:46:09 am »
If you can't Google the markings, then you are probably better off replacing it by description/specification.
You should be able to tell from the circuit what the voltage and current ratings should be.
 

Offline RobertoLG

  • Frequent Contributor
  • **
  • Posts: 361
  • Country: br
Re: What's this please? (Component Advice)
« Reply #896 on: February 05, 2016, 04:55:31 am »
it's a rectifier, from an old stereo Gradiente DS 700, can't find the schematics either
« Last Edit: February 05, 2016, 05:10:05 am by RobertoLG »
 

Online tautech

  • Super Contributor
  • ***
  • Posts: 18365
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: What's this please? (Component Advice)
« Reply #897 on: February 05, 2016, 05:35:47 am »
it's a rectifier, from an old stereo Gradiente DS 700, can't find the schematics either
For mains or low voltage?
Avid Rabid Hobbyist
 

Offline RobertoLG

  • Frequent Contributor
  • **
  • Posts: 361
  • Country: br
Re: What's this please? (Component Advice)
« Reply #898 on: February 05, 2016, 06:07:19 am »
eh, nevermind SK 308 - 1 amp/ 1000volt one should be enough, thanks anyway
 

Offline nali

  • Frequent Contributor
  • **
  • Posts: 304
  • Country: gb
Re: What's this please? (Component Advice)
« Reply #899 on: February 05, 2016, 08:59:41 am »
Not a component per se -

This was attached to the top of an Intel WG82574 QFN64 package Ethernet chip on a Commell fanless SBC. It seems to be made of a ceramic material and is fixed by double-sided tape. You can see it in-situ here http://www.globalamericaninc.com/commell-le-374.html, it's between the bottom of the mag jack and the main heatsink.

I've never seen this before so I wondered if anybody recognised it? The only guesses I can come up with is either a head shield to protect the chip from heat radiating from the main CPU heatsink (the 82574 itself has a large thermal pad) or maybe some form of EMI absorption? The pad shows no sign of magnetism though.

I'm inclined to think heat shield. We have a couple of hundred of these and I have a 3-4 with Ethernet failure after a couple of year's service - the only mode of failure to date.

Edit: pic attached 
 
« Last Edit: February 05, 2016, 11:30:33 am by nali »
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf