And presented in Dave's unique non-scripted overly enthusiastic style!
Fluke 189/289 Multimeter Review & Fluke 87V Comparison
Hats off to you, Dave! I really like your site and frequently visit it every now and then.
The facts you mention are really cool and I really appreciate the effort you have put into making this Vlog. I really like your work in making electronics accessible for mortals like us.
Fluke is not new to off-the-shelf parts and using refence desigsn.
Models from the stone age, like the Fluke 8020, 8022A, 8024 have a main IC called 429100. That one happened to have the same pin configuration as the Intersil ICL7106. The circuits of the meters are very much Intersil reference designs. And not surprising, the 429100 is supplied by Intersil. Guess what IC it really is, just with a magic Fluke custom number …
The 429100 A/D converter chip is NOT pin-for-pin compatible with the 7106. Pin #38 on the 429100 is an input, and is used to change a range function inside the 429100. On the 7106, pin #38 is an output for setting the clock frequency.
I have a brown-cased Fluke D800 (Army surplus), manufactured in 1980, and it is still in good working order 30 years later! It uses the same 802x-series circuit board as the Fluke 8020A. In fact, even though the conductance function is not shown on the front panel, it is still enabled. The A/D chip is a 429100, and all the other components match the values stated in the 8020A user manual. A great piece that I intend to keep for a long time.
Do you have the datasheet for the 429100? I have looking all over to find it because I want to convert my 8010a to LED.
As a rule of thumb, power consumption is proportional to the display size in my experience. Bigger displays usually take more power to run, so the shorter battery life isn’t all that surprising. I also wonder if they had to increase the processor clock to drive that display, making the situation worse.
Could you cover exactly what the counts are. For instance this meter is 4,000 count …
I don’t understand what the count is and how it is related to accuracy.
I believe Pomona (?) sells probes with similar dimensions as those great Fluke probes, but I’m guessing the quality isn’t the same (we had problems with one set in the lab, but in our lab I wouldn’t rule out abuse).
I got those tiny Fluke probes about 2 years ago at:
I see they cost a lot more now ~$45 US but well worth it. I only use these probes for all my small electronics. They are very nice.
I actually made my own probes in about ten minutes long ago.
Take some copper wire and put it around the normal tips of the probe to make a simple bushing. Then take the copper wire off and solder a real needle to the copper “tube”.
Works like a charm.
(I know I’m a year and a half late, but i’m going through all the ool EEv blogs from the beginning). Maybe others do so also.
Expensive is an understatement for thoses probes. Just ordered a set. They are about £58 here in the UK, though that does come with a set of replacement tips. But with fluke quality they should last for years, certainly for light electronics use.
Just buy the original Pomona probes, exactly the same and much cheaper; Farnell #4135799 € 21,65. Excellent probes, I have a set with most of my dmm’s.