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From: Martin Riddle on 2 Mar 2010 19:41


"John Larkin" <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote in
message news:robro5545g90qjkacgoj9dd9ptji4ifpk6(a)4ax.com...
> On Tue, 02 Mar 2010 11:49:08 -0800, Jeff Liebermann <jeffl(a)cruzio.com>
> wrote:
>
>>On Tue, 2 Mar 2010 09:03:35 -0600, "amdx" <amdx(a)knology.net> wrote:
>>
>>>Hows the low ohms range, the problem I have with my meter is on
>>>low ohm range. When I short the leads it might read 15 ohms, pull
>>>the leads, twist, yell at them and it may go down to 0.5 ohms.
>>
>>That's not the leads. It's the bananna jack connector where it
>>enters the meter. It might also be a broken wire.
>>
>>I have that problem with every meter I own and use the same fix. Spin
>>the bananna jack. I just noticed I have a Extech 22-816 True RMS
>>Multi-meter on my desk. No idea who left it here or where I stole it
>>from. Works nicely on low ohm. About 0.5 ohms without spinning the
>>bananna jacks. About 0.3 after.
>>
>>>I have used Cremolin on them but this is a problem that is getting
>>>old!
>>
>>Clean out the residual oil and grease. Start over.
>>
>>>The other day I had an odd reading and had to rotate the function
>>>switch
>>>to get a normal reading. This is a Tenma.
>>
>>Sorry, no experience with Tenma.
>>
>>>I have a Beckman HD 110 that
>>>went flakey many years ago
>>
>>I bought one of those at a club meeting. Most of the attenuator
>>section was blown. I gave it to a friend for parts.
>>
>>>and a Fluke 77 that a battery leaked in.
>>
>>Nice work. I wrap my 9v batteries in cellophane foil.
>>
>>>Meters
>>>I should have tossed them 15 yrs ago, but ya know "someday" I might
>>>fix
>>>them. ;-)
>>
>>I had my pile also. However, I use them often enough that I recycled
>>all my $5 Harbor Freight DVM's and got something better (Extech).
>
> I have an Extech DVM/thermocouple thing and it's pretty nice. I
> haven't blown it up yet.
>
> The Extech stuff is generally pretty good. FLIR recently bought them
> (probably to sandbag their IR imager project) so I don't know if they
> can stay pretty good.
>
> John
>

They do have a neat wireless datalogger in a couple of their meters. IP6
and 10' drop rating. Much less than a caparable Fluke.

Cheers



From: Mark Zacharias on 2 Mar 2010 20:59
"amdx" <amdx(a)knology.net> wrote in message
news:d1d96$4b8d296f$18ec6dd7$3939(a)KNOLOGY.NET...
>
> "Okkim Atnarivik" <Okkim.atnarivik(a)twentyfour.fi.invalid> wrote in message
> news:hmijr1$bb$1(a)epityr.hut.fi...
>> In sci.electronics.design amdx <amdx(a)knology.net> wrote:
>> : It's time, I need to purchase a new multimeter, home benchwork only.
>> : I could work with a autorangeing meter as long as it's not slow.
>> : AC, DC, volts, ohms, amps, capacitance ok but I have a cap meter.
>> : I generally use a 0.1 ohm or 0.01 ohm resistor as a shunt to measure
>> : current.
>> : I'm looking at the Fluke meters, I want it to last 15 years, the one
>> after
>> : that will last my lifetime! I figure on spending around $200.
>> : Any suggestions about another quality brand or Fluke Models?
>>
>> Well, this is not a known quality brand, but I was very happy
>> with my TENMA, I think the equivalent current model is the 72-7732.
>> 181e in Farnell. Mine had a 80mV range with 10uV lowest count, which
>> might come handy with your low value shunts. That range was very useful
>> in SQUID work. The 72-7732 seems to have a 40mV range with same reso.
>> My unit had a robust and solid feel and served me well for 3 or 4 years,
>> and felt like it would serve much longer. Unfortunately British Airways
>> lost my luggage last year and down that drain went the DMM, too.
>>
> Yea, have a Tenma now, it's worked for me at least 15 years, but has
> connector problems. I like that low volt range. I'll look into the price.
> Mike
>

Current Tenma models are made by Uni-T (United Trends) and can be had for
less buying direct (eBay).

Looks like pretty good stuff, as far as it goes. I cannot think the support
would be much good, but their better meters start at 60.00 to about 180.00
for the handheld oscilloscope.

The Chinese Fluke 110 series don't cost much more, and have a 3 year
warranty, but I don't think they have a regular technicians' multimeter in
this range, only electrician (industrial) type.

Anyone interested should check out Dave Jones' EEVblog on Youtube for
multimeter reviews. I really enjoy them.


Mark Z.

From: Jeff Liebermann on 2 Mar 2010 21:02
On Tue, 02 Mar 2010 10:07:17 +0000 (GMT), "Dave Plowman (News)"
<dave(a)davenoise.co.uk> wrote:

>For a bench unit I far prefer a LED or plasma display. LCD is too
>directional.

Easy. I can buy a case of LCD cheapo Extech type DVM's for the price
of a proper 5.5 digit bench multimeter. If you can't see the LCD
display from the other end of the bench, just buy a 2nd cheapo meter
and attach one to each end of the bench. Maybe one in the middle if
necessary. They're cheap enough. Extra credit for running them in
parallel.

I hate to admit it, but I mostly use my various DVM's for continuity
testing and measuring the charge state on batteries. I could probably
do as well with a buzzer and a light bulb, but a DVM gives the
impression that I know what I'm doing. It's probably all those
buttons and switch settings that I never use.

For a status symbol, I would show off with my tiny Tek 213
oscilloscope with a built in DVM. It scribbles 7 segment digits on
the CRT screen. Battery powered and really cute. I would use it
today but the batteries died and I keep forgetting to get some NiCd D
cells with tabs.
<http://www.teknetelectronics.com/Search.asp?p_ID=16843>

--
# Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
# 831-336-2558
# http://802.11junk.com jeffl(a)cruzio.com
# http://www.LearnByDestroying.com AE6KS
From: David L. Jones on 2 Mar 2010 21:55
Mark Zacharias wrote:
> "amdx" <amdx(a)knology.net> wrote in message
> news:87ca0$4b8c2ff3$d8baf3ed$1212(a)KNOLOGY.NET...
>> It's time, I need to purchase a new multimeter, home benchwork only.
>> I could work with a autorangeing meter as long as it's not slow.
>> AC, DC, volts, ohms, amps, capacitance ok but I have a cap meter.
>> I generally use a 0.1 ohm or 0.01 ohm resistor as a shunt to measure
>> current.
>> I'm looking at the Fluke meters, I want it to last 15 years, the one
>> after that will last my lifetime! I figure on spending around $200.
>> Any suggestions about another quality brand or Fluke Models?
>>
>> Mike
>>
>>
>>
>
>
> Hard to beat a Fluke 87 series V. There is a new 28 series II which is
> almost identical function, and uses AA cells instead of a 9V battery,
> but it's brand new, not discounted yet, costs 50.00 more than the 87,
> and here's the kicker for me:
>
> The 800 hour rated battery life is great, yes? Except for the battery
> corrosion problems we are inevitably going to see resulting from this.
> People are simply going to forget to change their batteries in time.
> Hopefully Fluke will have the appropriate replacement parts
> available...
> A 9V battery in a 87V should last about 1 year of normal use, and 9V
> models are double encased, therefore less prone to leakage. Current
> consumption in auto-power off mode is vastly improved over the III
> series, about 25uA. My 85III ia useless in this respect, drawing very
> nearly as much in "power-save" mode as in actual operation.
>
> Contrary to popular belief however, Fluke's vaunted lifetime warranty
> is only to the original purchaser. On the bright side, they are all
> over eBay for less than 250.00 used.
>
> The 28II is waterproof though! And 10 foot drop resistant! How cool!

It is indeed.
See my Fluke 28-II review:
http://www.eevblog.com/2010/02/28/eevblog-64-fluke-28-series-ii-multimeter-review-teardown/

I will also be posting my "torture test" of a 28-II soon, where I, umm,
destroy a brand new meter. Let's just say that it meets the claimed
ruggedness specs.

Dave.

--
================================================
Check out my Electronics Engineering Video Blog & Podcast:
http://www.eevblog.com


From: Jim Yanik on 2 Mar 2010 23:03
Jeff Liebermann <jeffl(a)cruzio.com> wrote in
news:1dfro5ls0okjnjel0upb3i5k0g4qvidmqu(a)4ax.com:


> For a status symbol, I would show off with my tiny Tek 213
> oscilloscope with a built in DVM. It scribbles 7 segment digits on
> the CRT screen. Battery powered and really cute. I would use it
> today but the batteries died and I keep forgetting to get some NiCd D
> cells with tabs.
><http://www.teknetelectronics.com/Search.asp?p_ID=16843>
>

It's amazing you have a 213 that's still operational.

One thing to watch out for with them is that the circuit boards are all
held in place by 4 little plastic pins in the case halves.
Under the treatment field service people would give the 213,those pins
sheared off or came out out of the case halves,and then the PCBs shift and
spread open the female connectors on the PCB edges,and little metal spring
leafs fall out and short out circuits.
sometimes with catastrophic results,like internal fires and/or melted case.

--
Jim Yanik
jyanik
at
localnet
dot com
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