electronics

Joined
Feb 3, 2012
Messages
78
Likes
6
#1
hi , i am looking for information on what this green round thing is in the photo and what the value of this might be, this is part of a circuit board for a fluke t140 voltage tester, any help would be appreciated
 

Attachments

Spectre

Administrator
Staff member
Jnr Admin
Joined
Jun 3, 2001
Messages
39,179
Likes
588
#6
Can you take some more pictures?

At a guess it is some sort of tranzorb, metrosil or varistor type device which snips off transient voltages. After they operate beyond their lifespan they can go short which causes catastrophic failure.

If it is the first thing in the circuit after the probes (and across them) then it's almost certainly a varistor. It wouldn't be a capacitor in that case as it would conduct when measuring AC.

I see a diode bridge there...

I guess varistor.

Meter goes to 690VRMS? Nearly 1000V peak so something above that but I couldn't guess the Joule rating. It has a strange case, they are almost all smooth and blue but at a guess it is different due to space limitations. Looks thicker than usual too.
 

Spectre

Administrator
Staff member
Jnr Admin
Joined
Jun 3, 2001
Messages
39,179
Likes
588
#10
This is what is was but I'm having difficulty locating it on the Epcos site:

Code:
https://www.yoycart.com/Product/551199524644/
I could recognise the Epcos logo from one of the new pictures. If it's what I think it is then it will most likely work without it albeit not as safely :).

Maybe it is something other than a varistor, like @chookey said, it does look thermistor-ish. Without seeing a schematic it's not easy.
 
Last edited:

nara

Who?
VIP Member
Joined
Jan 14, 2002
Messages
14,987
Likes
581
#14
FLUKE multimeter disassemble accessories, component number: RT1 RT2 component model: R112.



Professional maintenance FLUKE multimeter , sales of various multimeter accessories, multimeter calibration service, calibration source for FLUKE5520A, can calibrate FLUKE multimeter , and other brands of digital multimeter, please consult the owner.


Price Description
Line price
Refers to the counter price, hangtag price, genuine retail price, manufacturer's guide price or the sales price of the product that has been displayed, which is not the original price and is for reference only.
Unlined price
Refers to the real-time price of the commodity , and does not change the nature due to the difference in expression. The specific transaction price changes according to the goods participating in the event, or the members use coupons, points, etc., and finally the price of the order settlement page shall prevail.
The price of the business details page (including the main picture) in the form of pictures or texts may be the price of the coupon, full reduction or specific offers and time slots, etc. The price, prevailing conditions or activity rules of the page shall prevail.
This description is valid only when price comparisons occur. For details, please refer to the Taobao Price Release Specification. If the merchant separately describes the price of the line, the description of the merchant shall prevail.
 

Spectre

Administrator
Staff member
Jnr Admin
Joined
Jun 3, 2001
Messages
39,179
Likes
588
#18
Difficult to say as it appears to be a 3-band colour code but I bet it isn't really as it could be a precision resistor. Which is likely in a meter.

If that is purple/violet then it could be a 750R although if it were something more fancy the purple might be a tolerance band. It could be 0.15R at 0.1% if you read it the other way and omit the first band or some weirdness. It might be 1.5R... 15R... It depends on the manufacturer when you get to strange banding.

If this meter has had a large overvoltage applied I'd buy a new one :). Replacing parts with random bits in something like that is never going to be the same.
 
TEST
Top