Help: Fluke 87V Meter Calibration

manp111 · 23rd January 2012, 09:36 PM

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.

Enzo · 23rd January 2012, 10:49 PM

Pardon me mentioning the obvious, but did we check that the battery in the meter was fully charged?

afpmelguy · 23rd January 2012, 11:10 PM

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

manp111 · 23rd January 2012, 11:43 PM

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.

manp111 · 23rd January 2012, 11:44 PM

Perry,

Yes, only the ohms function is inaccurate.

astouffer · 23rd January 2012, 11:54 PM

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.

manp111 · 24th January 2012, 12:10 AM

I understand.
Suppose it is off at 10 ohm, how do I correct it ?

manp111 · 24th January 2012, 12:12 AM

For example, some of the speaker drivers are 11 ohm. My Fluke 87V shows 7 ohms.

manp111 · 24th January 2012, 12:14 AM

I meant the measured DC resistance of the speaker drivers is 11 ohm with accurate meter.

afpmelguy · 24th January 2012, 01:03 AM

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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23rd January 2012, 10:49 PM	#2
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	Pardon me mentioning the obvious, but did we check that the battery in the meter was fully charged?

23rd January 2012, 11:10 PM	#3
afpmelguy diyAudio Member Join Date: Jan 2012	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

23rd January 2012, 11:43 PM	#4
manp111 diyAudio Member Join Date: Jun 2010 Location: Austin, Texas	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.

23rd January 2012, 11:44 PM	#5
manp111 diyAudio Member Join Date: Jun 2010 Location: Austin, Texas	Perry, Yes, only the ohms function is inaccurate.

23rd January 2012, 11:54 PM	#6
astouffer diyAudio Member Join Date: Jun 2004 Location: Pittsburgh, crumbling wasteland	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.

24th January 2012, 12:10 AM	#7
manp111 diyAudio Member Join Date: Jun 2010 Location: Austin, Texas	I understand. Suppose it is off at 10 ohm, how do I correct it ?

24th January 2012, 12:12 AM	#8
manp111 diyAudio Member Join Date: Jun 2010 Location: Austin, Texas	For example, some of the speaker drivers are 11 ohm. My Fluke 87V shows 7 ohms.

24th January 2012, 12:14 AM	#9
manp111 diyAudio Member Join Date: Jun 2010 Location: Austin, Texas	I meant the measured DC resistance of the speaker drivers is 11 ohm with accurate meter.

24th January 2012, 01:03 AM	#10
afpmelguy diyAudio Member Join Date: Jan 2012	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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