Some DMM manufacturers state that the display of a meter is "6000 count" capacity. With all those 4 digits, the display could show 9999. Why is it called "6000 count"? <http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=- 1&storeId=10001&catalogId=10001&productId=1537336> Thank you.
"6000 count" display?
Started by ●November 17, 2009
Reply by ●November 17, 20092009-11-17
Gloria West wrote:> Some DMM manufacturers state that the display of a meter is > "6000 > count" capacity. > > With all those 4 digits, the display could show 9999. > > Why is it called "6000 count"? > > <http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=- > 1&storeId=10001&catalogId=10001&productId=1537336> > > Thank you.The link didn't work for me. Anyway, the DMM is probably programmed to read up to 5999. The majority of DMMs can display up to 1999 and are called 3 1/2 digit types. Those reading up to 3999 are often called 3 3/4 digit types. Those going up to 19999 are called 4 1/2-digit models, and so on.
Reply by ●November 17, 20092009-11-17
> The link didn't work for me.<http://tinyurl.com/yljnu77>> Anyway, the DMM is probably > programmed to read up to 5999. The majority of DMMs can display > up to 1999 and are called 3 1/2 digit types. Those reading up to > 3999 are often called 3 3/4 digit types. Those going up to 19999 > are called 4 1/2-digit models, and so on.I've been used to seeing that nomenclature: 3 1/2, 4 1/2... Had not seen the spec called "Display Count" as 6000, etc.
Reply by ●November 17, 20092009-11-17
"Gloria West"> > Some DMM manufacturers state that the display of a meter is "6000 count" > capacity. > > With all those 4 digits, the display could show 9999. > > Why is it called "6000 count"?** Cos that IS in fact the largest reading possible on the particular meter. There are 2000, 3200, 4000, 6000 etc count meters on the market that all use 4 digits. The really important difference is in the accuracy built into each model - there is really no point in having more than 2000 counts shown if the basic accuracy is only 1%. Generally, 2000 count meters have 0.5 % DC accuracy, 3200 count meters 0.3%, 4000 count 0.25% and 6000 count 0.15%. The principle being that in the worst case situation, where only 10% of the available count is visible - the meter's inherent * inaccuracy * affects only a single count. The worst case is when the reading is just a tad over what the next lower range will accommodate - like 201 mV on a 2000 count meter. ..... Phil
Reply by ●November 17, 20092009-11-17
Phil Allison wrote:> > The worst case is when the reading is just a tad over what the > next > lower range > will accommodate - like 201 mV on a 2000 count meter. > >This is where a so-called 3 3/4 DMM (up to 3999) comes in useful for me as the standard mains voltage here (India) is 230V.
Reply by ●November 17, 20092009-11-17
On Tue, 17 Nov 2009 00:53:10 -0800, Gloria West <gloriasbest22@NOSPAMgmail.com> wrote:>Some DMM manufacturers state that the display of a meter is "6000 count" >capacity. > >With all those 4 digits, the display could show 9999. > >Why is it called "6000 count"?--- See page 2 of: http://www.intersil.com/data/an/an017.pdf ---><http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=- >1&storeId=10001&catalogId=10001&productId=1537336> > >Thank you.--- My pleasure. JF
Reply by ●November 17, 20092009-11-17
Gloria West wrote:> Some DMM manufacturers state that the display of a meter is "6000 count" > capacity. > > With all those 4 digits, the display could show 9999. > > Why is it called "6000 count"? > > <http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=- > 1&storeId=10001&catalogId=10001&productId=1537336> > > Thank you. >David Jones does a nice job explaining counts in his EEVblog. See: http://www.eevblog.com/2009/08/21/eevblog-26-multimeter-counts-accuracy-resolution-calibration/ or, if the line wrap in the above causes trouble: http://www.eevblog.com/2009/08/ then look at EEVblog #26 - Multimeter Counts, Accuracy, Resolution & Calibration Ed