Author Topic: NimH batteries for Fluke 287/289  (Read 11000 times)

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Offline roli_bark

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NimH batteries for Fluke 287/289
« on: May 23, 2013, 03:30:31 pm »
Will the Fluke 287/289 DMM (6 AA batteries) work on NimH batteries - which are rated 1.2v ?
« Last Edit: May 23, 2013, 03:43:55 pm by roli_bark »
 

Offline Simon

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Re: NimH batteries from Fluke 287/289
« Reply #1 on: May 23, 2013, 03:31:46 pm »
Usually meters are that good on batteries that non rechargeable's are almost cheaper.
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Offline roli_bark

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Re: NimH batteries from Fluke 287/289
« Reply #2 on: May 23, 2013, 03:41:32 pm »
Sorry, but I didn't understand the relevance of this answer.
I'll also appreciate a link for this, if this was discussed here before.
Thanks.
 

Offline Balaur

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Re: NimH batteries for Fluke 287/289
« Reply #3 on: May 23, 2013, 04:31:35 pm »
I'm running my Fluke 187 on Eneloop AA batteries. Works very nicely.

Don't quote me on this, but I had I've only recharged them after 1 year of use.
 

Offline roli_bark

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Re: NimH batteries for Fluke 287/289
« Reply #4 on: May 23, 2013, 05:04:43 pm »
I'm running my Fluke 187 on Eneloop AA batteries. Works very nicely.

Don't quote me on this, but I had I've only recharged them after 1 year of use.
How many AA batteries does this Fluke 187 have ?
If 4 - the discrepancy between 4*1.2v=4.8 and nominal 6v may not be that significant for its internal supply requirements.

My worry is that for the Fluke 287/289, which has 6, the discrepancy between 6*1.2v=7.2 and nominal 9v may be too big.
« Last Edit: May 23, 2013, 05:06:52 pm by roli_bark »
 

Offline Simon

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Re: NimH batteries for Fluke 287/289
« Reply #5 on: May 23, 2013, 05:25:40 pm »
I'm running my Fluke 187 on Eneloop AA batteries. Works very nicely.

Don't quote me on this, but I had I've only recharged them after 1 year of use.

my point exactly, and rechargeables are lower capacity than normal ones
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Offline IanB

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NimH batteries for Fluke 287/289
« Reply #6 on: May 23, 2013, 05:37:05 pm »
It's a common misunderstanding to think rechargeable batteries like eneloops have a lower voltage than alkalines. It is only true of brand new and unloaded alkalines. It is not true over the typical lifetime of the battery in use.
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Offline roli_bark

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Re: NimH batteries for Fluke 287/289
« Reply #7 on: May 23, 2013, 05:39:30 pm »
It's a common misunderstanding to think rechargeable batteries like eneloops have a lower voltage than alkalines. It is only true of brand new and unloaded alkalines. It is not true over the typical lifetime of the battery in use.
Thanks.
So what does that mean - that the Fluke 287/289 functions OK with a 7.2v battery supply ?
 

Offline Simon

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Re: NimH batteries for Fluke 287/289
« Reply #8 on: May 23, 2013, 05:41:47 pm »
try it ? won't do any harm just registers as low battery if no good.
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Offline roli_bark

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Re: NimH batteries for Fluke 287/289
« Reply #9 on: May 23, 2013, 05:45:22 pm »
try it ? won't do any harm just registers as low battery if no good.
No can. Didn't buy the 287 yet, That's why I'm asking (before the decision is made)
 

Online ejeffrey

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Re: NimH batteries for Fluke 287/289
« Reply #10 on: May 23, 2013, 05:57:23 pm »
Yes.  NiMH batteries are 1.2 volt/cell for their entire discharge cycle.  Alkaline batteries are 1.5-1.6 unloaded and new, but their voltage drops over their life.  Ideally, electronics would operate down to 0.8 volt/cell to be able to fully use alkaline cell capacity.  In reality, a lot of electronics doesn't make it and cuts out at 0.9 or 1.0 volt/cell.  I haven't seen any commercial electronics that drops out at 1.2 volt/cell.  NiMH batteries will work fine on your meter.  Just make sure to use low self-discharge cells unless you use it really heavily.
 

Offline IanB

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NimH batteries for Fluke 287/289
« Reply #11 on: May 23, 2013, 05:58:20 pm »
It's a common misunderstanding to think rechargeable batteries like eneloops have a lower voltage than alkalines. It is only true of brand new and unloaded alkalines. It is not true over the typical lifetime of the battery in use.
Thanks.
So what does that mean - that the Fluke 287/289 functions OK with a 7.2v battery supply ?

Alkalines reach below 1 V per cell at end of life. Eneloops range from 1.35 V down to 1.2 V and spend most of their time at 1.25 V. So, yes, they should work.
I'm not an EE--what am I doing here?
 

Offline roli_bark

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Re: NimH batteries for Fluke 287/289
« Reply #12 on: May 23, 2013, 06:02:16 pm »
ejeffrey, IanB:
Usefull info. Thanks. Found some facts that corroborates -
 

Online ejeffrey

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Re: NimH batteries for Fluke 287/289
« Reply #13 on: May 23, 2013, 06:43:47 pm »
Yeah, that plot is a bit "optimistic."  It appears to be comparing a high capacity NiMH vs. a generic alkaline.  A high capacity alkaline will have more capacity, and a low-discharge eneloop will have slightly lower capacity. The shape of the discharge curve will remain the same, so the point remains.  Anything reasonably designed to run on AAs can use NiMH cells.
 

Offline ron

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Re: NimH batteries for Fluke 287/289
« Reply #14 on: May 23, 2013, 06:45:53 pm »
I use LSD NiMh in 2 289 and 2 189 meters.  No problem, and they last longer than alkaline batts.  The latest version of Tenergy  LSD AA's seem to perform equal to Sanyo Enerloop, and are less expensive. 
 

Offline ron

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Re: NimH batteries for Fluke 287/289
« Reply #15 on: May 23, 2013, 06:50:27 pm »
289/287 require 6 batteries.  189\187 require 4.
 

Online mimmus78

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Re: NimH batteries for Fluke 287/289
« Reply #16 on: May 23, 2013, 07:03:45 pm »
I can confirm NiMh works ok on my 287.
 

Offline roli_bark

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Re: NimH batteries for Fluke 287/289
« Reply #17 on: May 23, 2013, 07:05:23 pm »
Thank you ron.
The 'Tenergy' looks like Ch***se Ju**k, but due to their very low price I'll tend to take your advise.
 

Offline roli_bark

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Re: NimH batteries for Fluke 287/289
« Reply #18 on: May 23, 2013, 07:07:30 pm »
I can confirm NiMh works ok on my 287.
Thanks a lot. That re-affirms my tendency towards either the "battery eater" Fluke 287 or 289.
 

Offline codeboy2k

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Re: NimH batteries for Fluke 287/289
« Reply #19 on: May 23, 2013, 07:41:02 pm »
I usually use Eneloops NiMh they work great, my handheld meter is a Tektronix TX3

Also, I find that I can take 2 standard AA batteries that won't work anymore in some other device around the house, and put them in my meter, I get a few months more from it :)

I'm such a miser :)

 

Offline roli_bark

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Re: NimH batteries for Fluke 287/289
« Reply #20 on: May 23, 2013, 07:44:01 pm »
The latest version of Tenergy  LSD AA's seem to perform equal to Sanyo Enerloop, and are less expensive.
There seems to be 2 types of the 'Tenergy' NiMH:
- the high capacity (2600mAH) Blue package ones (with no LSD),
- the medium capacity (2000mAH) Red-on-White package LSD ones.
Which type would you recommend ? Link ?
 

Offline IanB

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Re: NimH batteries for Fluke 287/289
« Reply #21 on: May 23, 2013, 07:48:35 pm »
I would always recommend LSD batteries over non-LSD.

There may be other brands of LSD battery that are cheaper than Eneloops, but I don't think any of them have the same combination of durability, high power delivery, long storage life, manufacturing quality and consistency that Eneloops have. For a little more money you get a much more reliable battery.
I'm not an EE--what am I doing here?
 

Online M. András

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Re: NimH batteries for Fluke 287/289
« Reply #22 on: May 23, 2013, 07:54:09 pm »
i put into my 289 6 black 2500mah brand new cells straight out of the package after the original batteries depleted. as these came precharged and store it for a long time i didnt brother to charge them up first the battery indicator shows 3 bars out of the 4 after 3 months of low usage just like when i put them in the meter

edit: eneloop xx
« Last Edit: May 23, 2013, 08:38:02 pm by M. András »
 

Offline roli_bark

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Re: NimH batteries for Fluke 287/289
« Reply #23 on: May 23, 2013, 08:10:31 pm »
 

Online M. András

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Re: NimH batteries for Fluke 287/289
« Reply #24 on: May 23, 2013, 08:37:21 pm »
yeah sorry. i didnt write it
 


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