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measuring high value resistor?

 
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roli
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PostPosted: Tue Apr 14, 2009 7:03 pm    Post subject: measuring high value resistor? Reply with quote

i have a 1.8 Mega Ohm resitor, my meter can read up to 2 mega ohm, but when i try and read the value with the meter, i get a very inconsistant reading - sometimes as low as 0.8 mega ohm.

Or the reading is usually about 1.78 Mega ohm, but it fluctuates in value - it wont give a steady reading - always fluctuating between 1.7 - 1.9 Mega ohm. can anyone tell me why?

i tried an new battery - not that. It reads perfectly the lower value resistors of around 3k no problem?

I wanted to use a 1.8 mega ohm as a shunt , in parallel, with a very high value resitor to measure the higher values (above 2 megaohm), to save me buying a new meter Shocked
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roli
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PostPosted: Thu Apr 16, 2009 11:30 am    Post subject: Reply with quote

thanks for advice ,,,!

i did just about manage with a shunt resistor in parallel with the object resistor can hopefully forget the pricey meters. i measured resitance of 100megaohm+ with a 2megaohm meter with a 1.8megaohm shunt.

Cool
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scalzomen



Joined: 30 Dec 2008
Posts: 7
Location: Scontrone, Italy

PostPosted: Fri Apr 17, 2009 12:59 pm    Post subject: Reply with quote

maybe your resistor is damaged...have you try with a new one if it measures the right value?

bye
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