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Almost All Digital Electronics L/C Meter IIB

Started by Robert Baer October 23, 2014
   On semi-rare occasions,when i am measuring capacitors,the meter will 
say "Not a capacitor" and re-zeroing does not help.

   What is going on?
   Dew it need fixing?
On 23/10/2014 07:40, Robert Baer wrote:
> On semi-rare occasions,when i am measuring capacitors,the meter will > say "Not a capacitor" and re-zeroing does not help.
The AADE IIB is mostly meant for RF work and measures pF / low-nF caps. The internal calibration capacitor is approx 1nF. I love mine but it gives up above 0.1uF and I use a cheapie Chinese Cap meter for higher values. Does your IIB measure low value parts OK? Check the AADE website, last time I checked it had a lot including schematics, kit build instructions, etc. piglet
piglet wrote:
> On 23/10/2014 07:40, Robert Baer wrote: >> On semi-rare occasions,when i am measuring capacitors,the meter will >> say "Not a capacitor" and re-zeroing does not help. > > The AADE IIB is mostly meant for RF work and measures pF / low-nF caps. > The internal calibration capacitor is approx 1nF. > > I love mine but it gives up above 0.1uF and I use a cheapie Chinese Cap > meter for higher values. Does your IIB measure low value parts OK? > > Check the AADE website, last time I checked it had a lot including > schematics, kit build instructions, etc. > > piglet >
Oh, yes,low pF caps measure within specs of the cap; caps from about 10p to uFs read nicely. Bought mine made by the company after downloading the schematics and build instructions. Have had it for around 2 years with no problems until recently. Any clues?
On 25/10/2014 07:01, Robert Baer wrote:>>> On semi-rare occasions,when i 
am measuring capacitors,the meter will
 >>> say "Not a capacitor" and re-zeroing does not help.
 >    Have had it for around 2 years with no problems until recently.

So does it-

a) read "Not a capacitor" with parts that it sometimes does read 
correctly? or

b) always reads some caps correctly and always reads others as Not A cap?

Try opening the case and check for spider webs across the switches or 
similar cleanliness or connection issues. Sorry that is all I can think 
of at present.

piglet

On 10/25/2014 1:01 AM, Robert Baer wrote:
> piglet wrote: >> On 23/10/2014 07:40, Robert Baer wrote: >>> On semi-rare occasions,when i am measuring capacitors,the meter will >>> say "Not a capacitor" and re-zeroing does not help. >> >> The AADE IIB is mostly meant for RF work and measures pF / low-nF caps. >> The internal calibration capacitor is approx 1nF. >> >> I love mine but it gives up above 0.1uF and I use a cheapie Chinese Cap >> meter for higher values. Does your IIB measure low value parts OK? >> >> Check the AADE website, last time I checked it had a lot including >> schematics, kit build instructions, etc. >> >> piglet >> > Oh, yes,low pF caps measure within specs of the cap; caps from about > 10p to uFs read nicely. > Bought mine made by the company after downloading the schematics and > build instructions. > Have had it for around 2 years with no problems until recently. > > Any clues?
Does your description "until recently" mean suddenly? That is, as far as you can tell, did it possibly degrade over time? Either way can be a clue.
piglet wrote:
> On 25/10/2014 07:01, Robert Baer wrote:>>> On semi-rare occasions,when i > am measuring capacitors,the meter will > >>> say "Not a capacitor" and re-zeroing does not help. > > Have had it for around 2 years with no problems until recently. > > So does it- > > a) read "Not a capacitor" with parts that it sometimes does read > correctly? or
* Usually get that open circuit...
> > b) always reads some caps correctly and always reads others as Not A cap?
* It is a ranDUMB problem.
> > Try opening the case and check for spider webs across the switches or > similar cleanliness or connection issues. Sorry that is all I can think > of at present. > > piglet >
John S wrote:
> > The AADE IIB is mostly meant for RF work and measures pF / low-nF caps.
I use it so little, that "recently" is the only answer..
On Thursday, October 23, 2014 2:40:38 AM UTC-4, Robert Baer wrote:
> On semi-rare occasions,when i am measuring capacitors,the meter will > say "Not a capacitor" and re-zeroing does not help. > > What is going on? > Dew it need fixing?
Could be leakage. You could add a smaller cap in series w/the 'cap under test' & do the math. That would eliminate any leakage problem, and extend the meter's range too. Cheers, James Arthur
dagmargoodboat@yahoo.com wrote:
> On Thursday, October 23, 2014 2:40:38 AM UTC-4, Robert Baer wrote: >> On semi-rare occasions,when i am measuring capacitors,the meter will >> say "Not a capacitor" and re-zeroing does not help. >> >> What is going on? >> Dew it need fixing? > > Could be leakage. > > You could add a smaller cap in series w/the 'cap under test'& do the math. > That would eliminate any leakage problem, and extend the meter's range too. > > Cheers, > James Arthur
An OPEN circuit? RanDUMB?
On Monday, October 27, 2014 10:30:30 AM UTC-4, Robert Baer wrote:
> dagmargoo...@yahoo.com wrote: > > On Thursday, October 23, 2014 2:40:38 AM UTC-4, Robert Baer wrote: > >> On semi-rare occasions,when i am measuring capacitors,the meter will > >> say "Not a capacitor" and re-zeroing does not help. > >> > >> What is going on? > >> Dew it need fixing? > > > > Could be leakage. > > > > You could add a smaller cap in series w/the 'cap under test'& do the math. > > That would eliminate any leakage problem, and extend the meter's range too. > > > > Cheers, > > James Arthur > An OPEN circuit? > RanDUMB?
I was responding to the original post. If it happens with the leads open, that's another thing entirely. It would help if you'd just said that to start with. "My AADE cap meter reports 'not a capacitor' with nothing connected." There, that wasn't so hard was it? Cheers, James Arthur