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Old 23rd January 2012, 09:36 PM   #1
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Default Help: Fluke 87V Meter Calibration

I have a Fluke 87V Meter.
The resistance measurement is not accurate. The reading is well below the correct value.

Could you guys tell me how to fix this ?

Someone suggested changing the capacitors. I opened up the meter but couldn't tell which are the capacitors. Maybe you guys can tell point them out.
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Old 23rd January 2012, 10:49 PM   #2
Enzo is offline Enzo  United States
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Pardon me mentioning the obvious, but did we check that the battery in the meter was fully charged?
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Old 23rd January 2012, 11:10 PM   #3
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I'm familiar with Fluke products and calibration. Is the ohms function the only things that is suspect? Let me know I would like to help you.

Kind Regards,
Perry
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Old 23rd January 2012, 11:43 PM   #4
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That is a great point.
That battery has been in there for 2 years.
Since other measurements are fine, I didn't think about the battery.
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Old 23rd January 2012, 11:44 PM   #5
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Perry,

Yes, only the ohms function is inaccurate.
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Old 23rd January 2012, 11:54 PM   #6
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Check and see where it loses accuracy. Try measuring some known values like 10 ohms, 1k, 100k, 1M etc. When we get meters calibrated at work they check every scale.

Check the board for something obvious like a bad solder joint. Changing out parts that aren't bad could worsen the accuracy.
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Old 24th January 2012, 12:10 AM   #7
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I understand.
Suppose it is off at 10 ohm, how do I correct it ?
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Old 24th January 2012, 12:12 AM   #8
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For example, some of the speaker drivers are 11 ohm. My Fluke 87V shows 7 ohms.
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Old 24th January 2012, 12:14 AM   #9
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I meant the measured DC resistance of the speaker drivers is 11 ohm with accurate meter.
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Old 24th January 2012, 01:03 AM   #10
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I've got several ideas. Also if the batter was the problem the display window would show a battery symbol. The meter does monitor the battery level.



Let me know if I can help.

Thanks
Perry
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