Bottlehead Forum

Bottlehead Kits => Crack => Topic started by: FrancoB on August 05, 2010, 04:12:59 AM

Title: Question about resistance check
Post by: FrancoB on August 05, 2010, 04:12:59 AM

On terminal 13 the manual states that it should slowly climb to 270K.

In my situation it slowly descends to 270K.

What's going on here?

The rest of the checks are OK. Many thanks for your help!

Title: Re: Question about resistance check
Post by: FrancoB on August 05, 2010, 09:25:01 AM

OK. This happened only the first time. Still don't know what went wrong there.

Title: Re: Question about resistance check
Post by: Grainger49 on August 05, 2010, 10:18:50 AM

If you do a resistance check it charges the capacitor.  If you then reverse the leads it starts at infinity or somewhere there about and comes down to the final resistance.

Title: Re: Question about resistance check
Post by: Paul Birkeland on August 07, 2010, 05:25:32 PM

Hello Franco,

Different meters behave differently when measuring a resistor with a capacitor across it.  The big jist of those measurements is that you have high resistance from B+ to ground (across the capacitor).  If you saw something between 0 and 10,000, that would be concerning (short).

Title: Re: Question about resistance check
Post by: druelle on August 17, 2010, 02:35:39 PM

I also have a question regarding the resistance check. When checking the terminals that should read 2.9K ohm, I read exactly 3.00K ohm. Should this be a concern or is within the normal variation?

Thanks in advance.

Title: Re: Question about resistance check
Post by: JC on August 17, 2010, 03:09:13 PM

I think that you will find that the reading you describe is well within tolerance.  Even at a tolerance of + or - 5%, you would be allowed a deviation of ~145 Ohms either way, and I would be surprised if Bottlehead is specifying a tolerance that tight on resistance checks.