i am havinga problem understanding how some reading on an analog
tester is arrived at.On the face of an analog meter the dc v is marked from 0-10vdc,0-50 vdcand 0-250 vdc.
I am now looking on a meter as i write and the pointer shows 7.25dc v on the 0-10 scale,37.5dc v on the 0-50dc v scale and 185 dc v on the 0-250 scale.According to the book i am reading from,it said the pointer reads about 80 vdc and if the range selector is set at 2.5vdc then the measurement voltage value would be 0.80 vdc
I just do not understand how the author arrive at the 80 or the 0.80 vdc!!
2007-06-14 13:10:47 · 6 answers · asked by Delroy D 1 in Science & Mathematics ➔ Engineering
When you set the range, that determines which scale to read.
So if you selected 2.5vdc, you would read the 0-250 scale.
It's the only one which exactly matches your range selection.
You have to assume a decimal point, 2 places from the right.
So if the needle reads 80, then it should be interpreted as 0.80vdc.
2007-06-14 13:24:45 · answer #1 · answered by Robert S 7 · 1⤊ 0⤋
If these batteries are OK, the meter leads connecting properly to both the meter and the battery terminals, and the meter on a suitable DC voltage range, the meter should read. Make sure leads connect properly, that a DC range is selected (NOT AC!), and if still no reading maybe those batteries are flat! You weren't measuring resistance of the batteries, were you? That can't be done. If you tried this, you have probably blown the meter fuse.
2016-04-01 08:13:47 · answer #2 · answered by Anonymous · 0⤊ 0⤋
There's going to be a switch to actually change the sensitivity of the meter. Depending on which scale it's set to, then the range corresponds to that voltage. In other words, 7.25 out of 10 is the same ratio of 37.5 out of 50. Once you flip the switch (find it) the needle will move. You don't use all scales at once. From what you said so far, I assume the meter has a setting that says 2.5 V, 25.0 V, or 250 V?
2007-06-14 13:17:58 · answer #3 · answered by supastremph 6 · 0⤊ 0⤋
You should a mechanical switch to select which range you're on. That switch should show which scale you're on (let's say it says 0-50 and your range selector) and if you are on the 5 volt selection, full scale is no longer 50 volts, it's 5 volts. If you were on the 500 volt selection, full scale is now 500 and not 50. You simply have to do a mental scale. So many people are spoiled by the auto ranging digital stuff now
2007-06-14 13:32:25 · answer #4 · answered by Gene 7 · 0⤊ 0⤋
....sounds more to me like you are on a 100V scale, ergo read the 10V scale and multiply by 10, eh?
2007-06-14 13:26:02 · answer #5 · answered by Gary H 6 · 0⤊ 0⤋
you select the highest scale ,then you work your way down to the lowest scale
2007-06-14 13:16:09 · answer #6 · answered by bozotexino 4 · 0⤊ 0⤋