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Fluke 289 Meter

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WaveyDipole:

--- Quote from: rsjsouza on November 14, 2019, 03:32:16 pm ---WaveyDipole, the rotary switch test on the Agilent/Keysight meter was indeed quite worrying. However, there are a few variables that were discussed at the time that could sway the decision towards either way.

--- End quote ---

Thanks for the summary and I agree that's the problem with such tests. They can never be fully representative, although they do provide a measurable indication regarding the problem. As you say though, no one in practice constantly rotates all the way form one end to the other of the range or with predictable and balanced force. The contact materials may be different for the higher end meters or maybe not. So yes, I appreciate there are many variables.


--- Quote from: rsjsouza on November 14, 2019, 03:32:16 pm ---Specifically for the U1273A, on the price I would add the possibility of requiring a new display. Keysight sells a replacement display at a very steep price but others folks around here couldn't find quite a drop-in replacement.

--- End quote ---

Thank you for that info which I have noted. I am aware that ones with OLED display have a problem with it fading after 3 or 4 years, but didn't realise the ones with the LCD display also had problems. Another U1272A has cropped up with proper probes and case. It also looks very clean and the display seems to have good contrast. It is also evident from the photos posted by Galndalf_Sr, that the slimer verion uses a different and slightly larger display. Was it this display that has problems, or the one in the wider older style meters?
 
Incidentally I noticed in a photo that the meter display temperature without any probe plugged in? Does it have an internal sensor to display ambient temperature? If so, then that might be useful for logging.

Gandalf_Sr:

--- Quote from: WaveyDipole on November 14, 2019, 04:33:28 pm ---Incidentally I noticed in a photo that the meter display temperature without any probe plugged in? Does it have an internal sensor to display ambient temperature? If so, then that might be useful for logging.

--- End quote ---
Yes, these meters do have internal sensors for ambient temperature.  You can change it from C to F too.

rsjsouza:

--- Quote from: WaveyDipole on November 14, 2019, 04:33:28 pm ---
Thank you for that info which I have noted. I am aware that ones with OLED display have a problem with it fading after 3 or 4 years, but didn't realise the ones with the LCD display also had problems.

--- End quote ---

Interesting, my disclaimer was due to the fact you mentioned U1273A - the LCD version is U1272A.


--- Quote from: WaveyDipole on November 14, 2019, 01:51:29 pm ---Incidentally I came across a used U1273 for a reasonable price.

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Despite this, the OLED durability has been quite different depending on the people using them. My meter is three or four years old and was already NOS at the store, but shows absolutely no signs of bleed, pixel burn or dimming. Others said their displays bled when let sit in storage. No one really knows what conditions triggered this early decay, but it is certainly a problem with the technology of the time.

That said, it is still the best display for indoors and you couldn't ask for better appearance on camera.

WaveyDipole:

--- Quote from: rsjsouza on November 14, 2019, 05:45:46 pm ---
--- Quote from: WaveyDipole on November 14, 2019, 04:33:28 pm ---
Thank you for that info which I have noted. I am aware that ones with OLED display have a problem with it fading after 3 or 4 years, but didn't realise the ones with the LCD display also had problems.

--- End quote ---

Interesting, my disclaimer was due to the fact you mentioned U1273A - the LCD version is U1272A.

--- End quote ---

Mea culpa. I did indeed mention the "U1273" by mistake. I had been looking at the Keysight blurb on both, but the meter I was interested in was an Agilent branded U1272A which has an LCD. Unfortunately it has now gone. AFAIKT, the display is the only difference between the U1272A and U1273A but I stand to be corrected. Thanks for the clarification and info on the OLED displays. They certainly look vivid and seem to have excellent contrast when new. They are being used on all sorts of equipment nowdays and I guess that like most technologies, their longevity will probably improve with with further development as the technology matures.

Gandalf_Sr:
The OLEDs look stunning but their questionable reliability is  a reason to avoid them unless you actually need them for some reason.

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