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Author Topic: Meters  (Read 2539 times)

Offline webby1

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Meters
« on: September 12, 2014, 10:35:49 PM »
Question.

How can a meter read what looks like good values for a while and then out of the blue it starts giving crazy numbers?

It was reading 1.94V DC with a small fluctuation,, 1.91V and up to 1.94V then it started hitting 2.41V and then over 8V and then up and down sometimes showing the 1.94,,,

I took the meter without stopping the test run and swapped it out with another identical one,, same thing,, and then another one,, same thing,, then I pulled my Fluke out of where it was and used it,, no problem except that it was not showing the same values,, it was showing 2.31V to 2.33V.

These 3 were those cheap little red ones from Harbor Freight,, I have had one of those for a while and did not seem to have any issues,, then I bought these 3 when I broke the other one,, the more expensive P37772 meter also does not have this issue.


The test setup was simple enough,, I was using my PS to run a motor and then using that motor to drive another one,, I was measuring the DC output of the other motor,, so it was not connected to anything except the plastic gears, a few resistors, another DVOM for current,, which I disconnected and still had the issue,,

They have done this a few times,, but I can not think of what might be causing the noise they are picking up.

Free Energy | searching for free energy and discussing free energy

Meters
« on: September 12, 2014, 10:35:49 PM »

Offline gyulasun

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Re: Meters
« Reply #1 on: September 13, 2014, 12:29:11 AM »
Hi webby1,

Perhaps the brushes of the motors that fooled the meters?  They can produce spikes to cause such trouble if the motors have brushes, that is...  :)

Try to use an RC or LC low pass filter at the DC output if the load is indeed the voltmeter only (high impedance). The series R could be a few kOHm and the shunt cap (after the resistor) could be a few nanoFarad. And then use again those "fooled" meters to see whether they behave differently.

Gyula

Free Energy | searching for free energy and discussing free energy


Offline MarkE

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Re: Meters
« Reply #2 on: September 13, 2014, 10:40:57 AM »
Question.

How can a meter read what looks like good values for a while and then out of the blue it starts giving crazy numbers?

It was reading 1.94V DC with a small fluctuation,, 1.91V and up to 1.94V then it started hitting 2.41V and then over 8V and then up and down sometimes showing the 1.94,,,

I took the meter without stopping the test run and swapped it out with another identical one,, same thing,, and then another one,, same thing,, then I pulled my Fluke out of where it was and used it,, no problem except that it was not showing the same values,, it was showing 2.31V to 2.33V.

These 3 were those cheap little red ones from Harbor Freight,, I have had one of those for a while and did not seem to have any issues,, then I bought these 3 when I broke the other one,, the more expensive P37772 meter also does not have this issue.


The test setup was simple enough,, I was using my PS to run a motor and then using that motor to drive another one,, I was measuring the DC output of the other motor,, so it was not connected to anything except the plastic gears, a few resistors, another DVOM for current,, which I disconnected and still had the issue,,

They have done this a few times,, but I can not think of what might be causing the noise they are picking up.
You could as gylasun says be getting a noisy signal. Or you could have RF noise interfering with the meter.  To see if it is RF noise connect the test leads both together, close to, but not touching anything on the motor.  If the reading jumps away from zero, then RF is getting into the meter.  To test if the RFI is coming in through the test leads, repeat the test with the test leads unplugged.  If the meter stays at zero, it is noise pick up in the leads and putting a filter right at the meter will help.

Offline webby1

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Re: Meters
« Reply #3 on: September 13, 2014, 05:24:51 PM »
A word of advise,,

When you are feeling a little frustrated you should just stop what you are doing and take a break.

I used a cap and resistor to see if the readings settled down,, well they were not messed up right now but I did not think about the fact that there was a cap involved,, it was larger I suppose than it should of been,, but when you hook up your meter to see the current with a charged cap,,, poof goes the fuse.

I think I will just buy another meter that has better filters,, I do not trust what "I" do with electronics,, if I can mess it up I often do.

I do have my wireless router close, within 3 feet,, so I suppose when the universe is acting just right,, that could indeed provide the noise that the meters, all 3,, were picking up.

Also with these meters, they do not hold up for prolonged current readings,, one I was using after 10 minutes went from 0.115A to showing 0.157A,, I bought another meter to take that job over and now I think I will buy another for the voltage.

Thanks for the input.


 

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