So the part number is Schurter 0034.6002

http://www.digikey.com/product-detail/en/schurter-inc/0034.6002/486-2001-ND/640372

max current = 63mA
max voltage = 750mV

R = 750mV/63mA = 12Ω

16.8Ω seems a reasonable reading to me.

That sounds better than my words. Good stuff!

 

That sounds better than my words. Good stuff!

That is not the part

 

WK4225BK-ND

The spec sheet will say 3.8 ohms

Littlefuse part number 37200630411

http://www.digikey.com/product-detail/en/littelfuse-inc/37200630411/WK4225BK-ND/245307

So the spec sheet says Nominal Cold Resistance 3.8000 (Ohms)

Would the resistance stay the same if the fuse has already come close to melting?

(Another rhetorical question.)

 

WK4225BK-ND

The spec sheet will say 3.8 ohms

Note that the spec sheet only says that this is the nominal cold resistance. It does not give any spec at all regarding what the actual range of values are that will qualify as meeting spec.

Still, if the resistance has changed from it's previously measured value (measured under suitable and similar conditions), then something has happened to cause that change. It may or may not still be within spec, but something has caused a change, meaning that the part has almost certainly been stressed in some manner. Safe thing is to replace it with a new fuse. But, of course, that doesn't solve the problem (if there even is one), so it might happen again (with worse consequences).

 

Littlefuse part number 37200630411

http://www.digikey.com/product-detail/en/littelfuse-inc/37200630411/WK4225BK-ND/245307

So the spec sheet says Nominal Cold Resistance 3.8000 (Ohms)

Would the resistance stay the same if the fuse has already come close to melting?

(Another rhetorical question.)

That is the only thing I can think of. But I feel like it would have just blown and I would t be getting any resistance at that point. Not more.

 

Note that the spec sheet only says that this is the nominal cold resistance. It does not give any spec at all regarding what the actual range of values are that will qualify as meeting spec.

Still, if the resistance has changed from it's previously measured value (measured under suitable and similar conditions), then something has happened to cause that change. It may or may not still be within spec, but something has caused a change, meaning that the part has almost certainly been stressed in some manner. Safe thing is to replace it with a new fuse. But, of course, that doesn't solve the problem (if there even is one), so it might happen again (with worse consequences).

Yes, thank you. Haha sorry for the confusion. Maybe this is something I need to contact the supplier and see what kind of range these can have. This goes in a of board which regulates voltage to extend or retract solenoids. If the solenoid does not get a certain voltage the solenoid will not actuate. So they were working with this resistor when it had 4 ohms. Now that it has 16 ohms the solenoid is not getting enough voltage to actuate.

 

So the spec sheet says Nominal Cold Resistance 3.8000 (Ohms)

It does?

I see that it says 3.8 Ω. Lacking any further information that implies a tolerance range of somewhere in the vicinity of 0.05 Ω to perhaps as much as 0.5 Ω.

If it says the nominal resistance is 3.8000 Ω, now we are talking about a tolerance range down in the 50 μΩ to perhaps 500 μΩ range.

Spec sheets are pretty careful (but not perfect) about only putting in significant trailing zeros that really are significant.

 

Yes, thank you. Haha sorry for the confusion. Maybe this is something I need to contact the supplier and see what kind of range these can have. This goes in a of board which regulates voltage to extend or retract solenoids. If the solenoid does not get a certain voltage the solenoid will not actuate. So they were working with this resistor when it had 4 ohms. Now that it has 16 ohms the solenoid is not getting enough voltage to actuate.

I don't think you are going to get much help from Littlefuse.
I say that you have the fuse in the wrong location or change the fuse to a higher current rating.

 

I have a 63mA resistor in one of my boards. The resistor is rated at 4 ohms and 250 v.

The problem is that I started getting a lower output voltage on a the full assembled product. I narrowed it down the the resistor and I measured it at 16.8 ohms... How can a resistor that was once 4 ohms end up having 16.8 ohms??

 

are you sure it is a resistor? with current and voltage ratings? usually,resistors[the common ones] are rated in watts

 

are you sure it is a resistor? with current and voltage ratings? usually,resistors[the common ones] are rated in watts

Resistors are rated in ohms, and we have already established that the TS´s component is a fuse.