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From: nesesu on 2 Mar 2010 11:22
On Mar 1, 1:21 pm, "amdx" <a...(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?
>
>                                        Mike

I have a Fluke 75 and a 77 from new [25+ years] and they both are
working perfectly. Autoranging is fast enough that it is usually
unnoticed. 9V batteries last for years in my usage. I also have a pair
of Fluke 8000 bench DVMs, one with the Monsanto 'pin-point' LED
display, the other with the later 'light pipe' display and both with
internal NiCd battery pack. The still both work accurately but one has
a somewhat flakey switch.
I bought a cheap 'Canadian Tire' DVM I could take were I needed a
simple troubleshooting tester and there was a risk of loss or
destruction. It cost about $9 and is better than 1% on all ranges.

Neil S.
From: Jeff Liebermann on 2 Mar 2010 14:49
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).

--
Jeff Liebermann jeffl(a)cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
From: Jeff Liebermann on 2 Mar 2010 14:55
On Tue, 2 Mar 2010 09:16:59 -0600, "amdx" <amdx(a)knology.net> wrote:

>Hey Jeff, What is the autorange time? Say I probed a 9mv signal, how
>long before it reads correct?
> Mike

AC or DC? Frequency?

It's fairly noisy at low AC voltages. With nothing connected to the
leads, I'm getting about 1mv of noise, probably from AC hum and AM
radio stations. Looking at the settling time, my guess(tm) is that it
will be close within about 0.5 seconds, and stable after about 2
seconds. At 9mv AC, you're not going to get a stable reading without
shielding.

This is with the Extech (Radio Shack) 22-816 which somewhat different
from the Extech MN-16 that I'm too lazy to go to the car and retrieve.

--
Jeff Liebermann jeffl(a)cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
From: Jim Yanik on 2 Mar 2010 19:01
Jeff Liebermann <jeffl(a)cruzio.com> wrote in
news:vgqqo55inn69iq17t6bouje8v4edk0ln3e(a)4ax.com:


> 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).
>

FYI,those HF meters are all 1 Megohm input Z.

At one time,I flirted with the idea of redoing the divider string to get a
10MegR input Z. It's doable.


--
Jim Yanik
jyanik
at
localnet
dot com
From: John Larkin on 2 Mar 2010 19:39
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

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