Author Topic: Fluke 289 do not measure resistance  (Read 1209 times)

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Offline reggedTopic starter

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Fluke 289 do not measure resistance
« on: April 17, 2021, 06:14:35 pm »
Hi all. Is there any schematics to understand how resistance measure works? Everything works except ohms, lo 50ohm also work. But when i choose ohms, DMM shows 150Kom all time. When i short leads, it shows 2.3 Ohms.
 

Offline retiredcaps

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Re: Fluke 289 do not measure resistance
« Reply #1 on: April 17, 2021, 07:00:00 pm »
I suggest checking all the input protection like the PTC, MOVs, fusible resistor, etc.  The PTC should be around 1K ohm, the MOV's should be open circuit and fusible resistor around 1K ohm.

Also, if your 289 had battery leakage, it would be a good idea to clean the entire PCB with 99% IPA.
 

Online Grandchuck

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Re: Fluke 289 do not measure resistance
« Reply #2 on: April 17, 2021, 07:01:47 pm »
Also, there might be a pair of transistors serving as a voltage clamp (Zener) which could be damaged.
 

Offline Trader

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Re: Fluke 289 do not measure resistance
« Reply #3 on: April 17, 2021, 09:52:12 pm »
A Fluke 289 has a lifetime warranty, did you check this?
 

Offline reggedTopic starter

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Re: Fluke 289 do not measure resistance
« Reply #4 on: April 18, 2021, 06:57:55 am »
Can you show which thermistors and varistors? I found one green ptc with R112 marking. This probably exploded.
 

Offline reggedTopic starter

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Re: Fluke 289 do not measure resistance
« Reply #5 on: April 18, 2021, 12:38:15 pm »
I checked between com and V leads, there is ~150Kom and this resistance always shows on display.
 

Offline retiredcaps

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Re: Fluke 289 do not measure resistance
« Reply #6 on: April 18, 2021, 06:33:57 pm »
Can you show which thermistors and varistors? I found one green ptc with R112 marking. This probably exploded.
Post clear focused pictures of the PCB so we can see what you are talking about.
 

Offline BeBuLamar

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Re: Fluke 289 do not measure resistance
« Reply #7 on: April 22, 2021, 08:26:32 pm »
Why don't you simply send it back to Fluke for repair. It should be free.
 

Offline Elliotsk

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Re: Fluke 289 do not measure resistance
« Reply #8 on: April 24, 2021, 01:15:15 am »
I had the same problem ALSO the audible continuity worked intermittently as well.  HERE is the fix that worked perfectly.  For some reason the test leads on new Flukes have had some kind of coating on the outside that screws up the resistance and continuity tests.  Take a small patch of scotch-brite or very very fine sandpaper and clean the probe tips tip to base.   BAM! Problems solved for me!  Fingers crossed for you!
 


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