Resistor in series with voltmeter (for reading correction)

**sirkosero** · September 23rd, 2012 09:54 AM

anong brand ng digital meter gamit mo TS? minsan kasi kahiy digital, hindi ganun ka-accurate unless guaranteed ng manufacturer upto xxx decimal places.

personally, i take the results of a fluke voltmeter as the real voltage. ito din basis ko sa pag calibrate ng ibang meters

**miked** · September 23rd, 2012 10:05 AM

i always keep in the glove box a pocket size newstar brand digital tester. pero kinalibrate ko na yun sa original na sanwa sa office. my tester reads higher by 0.15 volts than the sanwa unit.

**sirkosero** · September 23rd, 2012 10:20 AM

sanwa? analog yan diba? medyo hirap ako sa analog but it gets the job done. ingat lang sa paralux error.

para lang din sigurado, get another meter to compare sanwa to. dagat pareho. if it is, may baseline ka na.

meron kami dati plug-in type sa cig. lighter. mas mataas ang reading by about 0.8v. we checked it against the reading of fluke. ngayon, what we do is subtract 0.8v sa reading ng plugin type. generally, for me, yung plugin type is just a general conditon check kung nagchcharge ang electric system or not. for accuracy talaga, fluke na.

minsan nga naiinis ang electrical shop pag fluke dala ko kasi nakikita pati slight drop ng voltage na si nila kaya makita sa ordinary tester

**Retz** · September 23rd, 2012 11:41 AM

Originally Posted by oj88

Accuracy means a lot to many people, myself included. I think what the TS is asking for is still quite relevant and practical.

If you have to go through the trouble of adding a voltmeter, it's only right to have it report the correct voltage.

ung mga measuring instrument like voltmeter may tolerance din. +/-5% usually and that already equates to 0.7V difference at 14V.

**Retz** · September 23rd, 2012 11:44 AM

Pag DC voltage lang naman, I suggest using an analog meter mas malaki kasi usually tolerance kapag digital multi meter ang gamit.

**miked** · September 23rd, 2012 07:59 PM

Originally Posted by sirkosero

sanwa? analog yan diba? medyo hirap ako sa analog but it gets the job done. ingat lang sa paralux error.

para lang din sigurado, get another meter to compare sanwa to. dagat pareho. if it is, may baseline ka na.

meron kami dati plug-in type sa cig. lighter. mas mataas ang reading by about 0.8v. we checked it against the reading of fluke. ngayon, what we do is subtract 0.8v sa reading ng plugin type. generally, for me, yung plugin type is just a general conditon check kung nagchcharge ang electric system or not. for accuracy talaga, fluke na.

minsan nga naiinis ang electrical shop pag fluke dala ko kasi nakikita pati slight drop ng voltage na si nila kaya makita sa ordinary tester

sanwa digital yung nasa office. fluke nga maganda kaso mahal din tsaka mahirap maghanap dito samin. i requested a fluke sa kamaganak abroad yung model na wireless yung monitor para kahit malayo kita mo reading. kaso nakalimutan na ata

**light2light** · September 24th, 2012 11:10 AM

syempre, important na accurate ang mga meters. for your peace of mind, install a pot (any value below ikohms). your problem is meter calibration. a fully charged battery will indicate 13.8v. iadjust the potentiometer at this value.

marami sa atin ang naghahangad ng accuracy of our measuring devices. nakakaasiwa kung hindi accurate ang mga ito.

marami rin palang electronic enthusiasts dito sa tsikot. i love...