[Test-Equipment] Evaluation of two DMMS

[J. Forster]

Try measuring several resistors, in the 100, 1K, 10K, and 100K ranges.

That should exercise the various autoranges. They don't need to be
accorate, just fairly stable.

-John

===============


> Hello Al. I put a new Duracell 9 volt battery in each to make sure they
> were using the same voltage source. These Flukes have ONLY an ohms range,
> so I guess they are auto ranging. The 8025 that reads .2 ohm with the
> leads shorted is one I have used for several years. I bought it at Shelby
> one year. the one that reads high is a recent ebay buy and the seller
> suggested that I return it but I like the 8025s because they are mil spec
> and would like to keep it if I can get it reading correctly.
>
> Barbara is recovering from a fractured leg and surgery on her wrist/hand
> due to a break, both of which were suffered in an auto accident.
>
> Weather is cool and we are otherwise doing OK. Hope you and Pat are doing
> well.
>
> We will be stopping by Belton, Texas Hamfest first week in October on the
> way home. 73, John, K5PGW
>
> --- On Sun, 8/8/10, Al Parker <anchor at ec.rr.com> wrote:
>
>> From: Al Parker <anchor at ec.rr.com>
>> Subject: Re: [Test-Equipment] Evaluation of two DMMS
>> To: "Discussion of Electronic Test Equipment"
>> <test-equipment at mailman.qth.net>
>> Date: Sunday, August 8, 2010, 9:35 AM
>> hi John,
>>     I hope things are well with you and
>> Barbara "out there".  Maybe not so
>> hot a July as "back here".
>>     A man with a watch knows what time it
>> is, a man with 2 watches is never
>> sure.
>>     If you switch batteries in the 2 meters,
>> does the same one still read
>> off?  Particularly the low range depends a bit on the
>> battery voltage
>> and ability to hold a current drain.
>>     On the next higher scale, do they read a
>> test resistor close to the
>> same?  (doesn't really matter  what the actual
>> resistance is.)
>>     It could just be that the resistor for
>> the low range in the "bad" one
>> has had too much current thru it & is off value.
>>     Just some thoughts.
>>     I've just started on an SP-600 to be
>> delivered at Shelby, hope there's
>> enuf time.  Same fellow I did one for 4 yrs ago.
>> 73,
>> Al
>>
>>
>>
>>
>> On 8/8/2010 1:09 PM, John King wrote:
>> > I have two Fluke 8025A multimeters that read
>> differently on the ohms scale.
>> >
>> > Using the same test leads on each, the ohms scale
>> reads differently on the two meters. With the leads shorted
>> on the ohms scale of one of the Flukes the resistance
>> reading is .2 ohms. The other meter, using the same test
>> leads, when they are shorted, reads 10+ ohms.
>> >
>> > I would like your input regading how useful the meter
>> that has the higher ohms reading might be in service work.
>> Measuring a 9 vdc battery on the DC scale reads within .01
>> vdc, so the difference is in the ohms scale.
>> >
>> > I am not sure how the ohms reading differing will
>> affect the utility of the higher reading meter in service
>> work.
>> >
>> > Your comments will be appreciated. Thanks and 73,
>> John, K5PGW
>> >
>> >
>> >
>> >
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