Truth Or Consequences?
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Forum Discussion
Is my calibrated $14,000.00 Tektronix oscilloscope accurate? Being two or three thousandths -+ is a hell of a hot better than one or two tenths of a volt. I ran lab grade tests on an amp hour meter in Las Penas and nearly fell out of my chair. FIVE PERCENT ERROR.
Least significant digit error say four counts, is trivial in a 4-1/2 digit non-loop powered meter. Of course a person has to ACTUALLY TEST some of these meters in order to not err in judgement. I also own 7-1/2 digit bench DMM that I qualify on the oscilloscope.
Loop powered panel voltmeters are a WORLD APART less accurate than divorced powered meters. LED meters consume a vastly greater amount of energy hence this is why I recommend L C D non loop powered meters. Yes accuracy degrades as a function of time spent in operation. How many MINUTES would you guess an LCD panel meter would spend in TEN YEARS when used for amp hour meter / volt meter corroboration? My stuff stays enclosed in a military box, scope and all, with 2 pound packets of silica gel. Salt air and condensing humidity degrade both monitoring and verification (qualification) instrumentation.
I have seen far too many cruisers being driven bug nuts trying to figure out anomalies between amp hour meter data and what the batteries are reflecting with a hydrometer. ERROR IS CUMULATIVE unless the meter resets to zero automatically declining from a plus total. Seesaw the reading to almost zero, back and forth, up and down, and wuwee what do you think happens with an overage or underage error?
MERELY KNOWING AND ACKNOWLEDGING an under or overage allows the user to compensate. My Cruising Equipment amp hour meter has a 1.7% underage. I compensated via the Peukert adjustment. I have a kWh meter that I rely on a lot more.
Yes a four digit Fluke is quite accurate. But not suitable for everyone because they are a pricey instrument. An accurate reasonably INexpensive panel meter is a more intelligent option. Some monitors have a voltage adjustment pot.
Like NASCAR racing, bow hunting or ALLIGATOR WRESTLING MONTHLY which I utterly ignore, if this thread has no significance to someone it too can be successfully ignored.
Least significant digit error say four counts, is trivial in a 4-1/2 digit non-loop powered meter. Of course a person has to ACTUALLY TEST some of these meters in order to not err in judgement. I also own 7-1/2 digit bench DMM that I qualify on the oscilloscope.
Loop powered panel voltmeters are a WORLD APART less accurate than divorced powered meters. LED meters consume a vastly greater amount of energy hence this is why I recommend L C D non loop powered meters. Yes accuracy degrades as a function of time spent in operation. How many MINUTES would you guess an LCD panel meter would spend in TEN YEARS when used for amp hour meter / volt meter corroboration? My stuff stays enclosed in a military box, scope and all, with 2 pound packets of silica gel. Salt air and condensing humidity degrade both monitoring and verification (qualification) instrumentation.
I have seen far too many cruisers being driven bug nuts trying to figure out anomalies between amp hour meter data and what the batteries are reflecting with a hydrometer. ERROR IS CUMULATIVE unless the meter resets to zero automatically declining from a plus total. Seesaw the reading to almost zero, back and forth, up and down, and wuwee what do you think happens with an overage or underage error?
MERELY KNOWING AND ACKNOWLEDGING an under or overage allows the user to compensate. My Cruising Equipment amp hour meter has a 1.7% underage. I compensated via the Peukert adjustment. I have a kWh meter that I rely on a lot more.
Yes a four digit Fluke is quite accurate. But not suitable for everyone because they are a pricey instrument. An accurate reasonably INexpensive panel meter is a more intelligent option. Some monitors have a voltage adjustment pot.
Like NASCAR racing, bow hunting or ALLIGATOR WRESTLING MONTHLY which I utterly ignore, if this thread has no significance to someone it too can be successfully ignored.
