Fluke 15B

[Zepnat]

Hi I've seen the Chinese only market Fluke 15B for a reasonable price but I question the accuracy. As an example the DC range seems rather large variation at +/-1% and 10 counts.

Ignore I used 0.1% instead of 1% in my calculation 

So if it reads 3.800v the actual value could be between 3.814v or 3.786v

And what if the input voltage is 12.60v is it possible to read between 12.72v and 12.49v please correct me.


I will watch daves multimeter shoot out next week when I can get back onto youtube.

Excuse my ignorance I've never got used to these instruments since they went digital.




AC Current Range : 0.1UA to 10A
DC Current Range : 0.1UA to 10A
AC Range Voltages : 0.1Mv to 1,000V
DC Range Voltages : 0.1Mv to 1,000V
Resistance Range : 0.1 ohm to 40Mohm
Capacitance Range : 0.01nF to 100uF

AC Current : 400uA / 4000uA / 40mA / 400mA / 4A / 10A
 Resolution : +/-1.5%+3
DC Current : 400uA / 4000uA / 40mA / 400mA / 4A / 10A
 Resolution : +/-1.5%+3
AC Voltage : 400mV / 4V / 40V / 400V / 1000V
 Resolution : +/-3.0+3
DC Voltage : 400mV / 4V / 40V / 400V / 1000V
 Resolution : +/-1.0+10
Resistance : 400 / 4K / 40K / 400K / 4M / 40M Ohm
 Resolution : +/-0.5%+3
Capacitance : 50nF/ 200Nf / 2Uf / 20Uf / 200Uf / 20Mf
 Resolution : +/-2%+5

It is at banggood for $58

[Fsck]

Why do you question the accuracy? The allowable error is large, yes; probably intentional so they don't risk compromising their "rest of the world" lines, and to what they find suitable for the price including their value of brand name.

[retiredcaps]

The 15B manual states for DCV

0 to 400mV is 1.0% +/- 10 counts (in mV range)
0 to 1000V range is 0.5% + 3 counts (in V range)

For 12.60V, that means

12.60 * .005 = 0.063.

12.60 - 0.063 = 12.537 or 12.54 rounded up.  Now subtract 3 counts.  The lower range is 12.51.

12.60 + 0.063 = 12.663 or 12.66 rounded down.  Now add 3 counts.  The upper range is 12.69.

So for a calibrated reference 12.60, the 15B will be in specifications if the reading is between 12.51 and 12.69.

edit: clarify ranges.

[retiredcaps]

BTW, Dave talks about counts, accuracy, back in #26

[retiredcaps]

So if it reads 3.800v the actual value could be between 3.814v or 3.786v

The specification will be 0.5% + 3 counts for a reading with 3.800V.

3.800 * .005 = 0.019

3.800 - 0.019 = 3.781.  Subtract 3 counts. 3.781 - 0.003 = 3.778

3.800 + 0.019 = 3.819.  Add 3 counts. 3.819 + 0.003 = 3.822.

[Zepnat]

ahh ha...

Thank you all for your fast replies I now see where I went wrong, using the specs from the sellers website they quote
1.0% +/- 10 counts,

they don't mention;
0 to 400mV is 1.0% +/- 10 counts (in mV range)
0 to 1000V range is 0.5% + 3 counts (in V range)

Also I used 0.1% in the initial calculation instead of 1% im a idiot my bad.

Ill watch that video next week, no youtube at the moment due to internet provider not liking me watching daves long videos!

Think I might get one here is the link if anyone else interested

http://www.banggood.com/Fluke-15B-F15B-Professional-Auto-Range-Digital-Multimeter-Tester-p-911684.html

They are ok I have bought from them before.

[Fsck]

for that price, wouldn't a UT-61E be a better choice (for electronics)?
you'd get superior specs and computer logging.

[Lightages]

for that price, wouldn't a UT-61E be a better choice (for electronics)?
you'd get superior specs and computer logging.

The Fluke is 15B is not the fullest featured multimeter in the world but you can count on its build quality and it being safe. That is the trade off compared to the UT61E and its higher accuracy and computer logging.

[Fsck]

for that price, wouldn't a UT-61E be a better choice (for electronics)?
you'd get superior specs and computer logging.

The Fluke is 15B is not the fullest featured multimeter in the world but you can count on its build quality and it being safe. That is the trade off compared to the UT61E and its higher accuracy and computer logging.

but, it's safeness rating is still limited, but still above what typical electronics fall under.

[Zepnat]

for that price, wouldn't a UT-61E be a better choice (for electronics)?
you'd get superior specs and computer logging.

Certainly looks like it would be thanks.
 
Is the UT-61E accurate enough to make use of the extra display resolution,  having the extra digit only gives a more meaningful result if its reliable right?

Do like the data logging option and for under $50 bargain!

[Fsck]

large thread on it:   https://www.eevblog.com/forum/testgear/uni-t-ut61e-multimeter-teardown-photos/

there are many threads about it, due it's excellent performance+features/cost ratio.

[Zepnat]

So, I opted for the ut-61e from a seller off aliexpress. £29 well spent. The ohms range is lightening fast also the bar graph is more useful than expected. Downloaded ultra dmm but not used in anger yet..
Happy 

[miguelvp]

So, I opted for the ut-61e from a seller off aliexpress. £29 well spent. The ohms range is lightening fast also the bar graph is more useful than expected. Downloaded ultra dmm but not used in anger yet..
Happy 

Try http://sigrok.org/

They seem to support your meter: http://sigrok.org/wiki/UNI-T_UT61E