Fluke 101 Effects of vibration
Vložit
- čas přidán 2. 07. 2024
- After a post about how the Fluke 101 was sensitive to vibration, I thought I would have a look for myself. See the original posts and review here:
www.eevblog.com/forum/blog/ee... - Věda a technologie
mine is from 2015 ( amazon India ) . one thing I noticed is that it picks up some reading in both the AC ranges just by proximity to an AC mains ( 220V 50 Hz) current appliance or hot outlet or wire . So sometimes I do use it just for that - non-contact AC sensing . It's a fine meter and survives until now as my only meter often carry around .
What you are describing is fairly common. I've seen several posts from beginners who buy a meter and think something is wrong with it because the meter will not read zero with nothing connected.
LMAO. I saw this meter on the CuriousMarc's channel a few months ago and immediately bought one.
Slapping and punching a multi-meter may be against CZcams TOS for harmful content
Thanks for posting, Joe!
Kind of reminds me of factory I worked in, one of many, that had environmental testers like temp chambers and a vibration machine that probably weighed hundreds of pounds. Stuff that was vibrated were power supplies and controllers. Can't recall anything failing.
One thing that didn't sit with me well was a engineer hand us use shorter bolts because of bolt stretch. These shorter bolts did not fully tread into the fixture because of the short length. His reasoning was the shorter bolts will stretch less.
Didn't you explain that using no bolts at all solves the stretch problem?
I never thought to smack my meter, but okay. I tried it with my Fluke 107 and it bumps up to ~50 or 100 mV. Even my Bryman BM869s will show ~50 mV with a good swat. I should say these are only random peak values, only when you hit it just right after 5 or 10 tries.
Still better than an analog meter in this regard.
Very true. I have an analog pressure gauge that I use on one of my motorcycles that is filled with glycerine to dampen the movements. I wouldn't be surprised if some of the high end analog meters did not have some sort of dampeners as well.
Cool test
I get about 30-50mV when I rub my hand on the LCD. It's not impact/vibration related.
If I rub my finger on the display with nothing attached to the meter, I see roughly that same 50mV error. If measure a 5.0VAC signal and then rub my finger on the display, it appears to have no effect. This is different than the Gossen Ultra (Prime now) where you have it attached to a low impedance source and the meter is still sensitive to moving your hands near it. How this meter ever made it on the market with such poor shielding is anyones guess.
Just as my mate Harry with his Russian wife says: I do it one more time so you can see that it is not a Fluke.......
Maybe a side load will do it. The resistor network is mounted vertically usually in these meters so the effect might be directional. Doing this while supplying it with say a precise 100V source might do the trick.
love the test & rig. Can you shake the meter in different orientations? Maybe that gives different results. Maybe just reverse phase on two actuators on your rig so one side goes up while the other goes down? Or do it diagonally?
I built it to run some trimmers (pots and caps) as people suggested they would change. I think I ran three axis in that test. I ran a little pocket meter as well but only one axis.
czcams.com/video/z42eqXfA4eI/video.html
I wonder if it is pre or post attenuation? Ie. Would it increase by n digits on any reading?
Doesn't appear to. I applied a constant 200VAC and smacked it around pretty good. Maybe OP will show what they are seeing.
👍👍
Could it be the original poster had one from a bad batch? I have never worked in manufacturing so I don't know the answer to this question: how likely is it that someone accidentally ordered a bunch of class 2 caps instead of class 1 and they just decided "use 'em anyway!"?
They may not even own one and only based their comments on what they saw during the EEVBLOG review, assuming what was shown was vibration related.
@@joesmith-je3tq Maybe. I went to buy one but they don't seem to be offered directly in Canada. I'd have to order from the US and pay import fees. This brings the price up to $86 CAD ($62 USD) for the Fluke 101 or $116 CAD ($84 USD) for the Fluke 101+ (I have no idea what the + means. It looks identical to the 101 from the front). Not as exciting of a deal as the $42 USD Dave talked about
Impedance related for sure. Shorting input is not charging any caps in input path either so not a very good test.
Try connecting leads to an actual voltage source and see if that changes the sensitivity to any vibration. After all if it is an effect relative to measured voltage, it won't show up when you measure 0. 50% error of 0 is still 0 😜
While I would expect no difference, had you read the comments you would know I did this and saw no effect.
@@joesmith-je3tq Comments are fine and good, but I would have liked to see it...
Also: Having done extensive vibration testing of both exploring and military grade equipment before I'd expect to run multiple axis tests. Especially for such issues that can be randomly affected by capacitor orientation during pick&place. On some equipment we even had to use specific components with known verified orientation to avoid certain effects.
@@1kreature I too would also expect a professional lab will run multiple axis to some standard and publish a report. You won't get that here. But, it's easy enough to run your own tests with what ever equipment you like. Then you can try what ever combination you like. If you do, post a video so we can see your results.
Joesmith zapped his with 17kV on all ranges and it survived.
LOL. Close. 12kV, 50us FWHH, 2 ohm source. I took the Fluke 107 to 14kV 100us FWHH and it survived. It was damaged at 15kV.
Why joe?. 12kv and now this...
Why what?
Nothing. It was a question to myself.😅
I really enjoy your test.
I wouldn't be surprised if OP's issue was a slightly defective unit. $50 MSRP doesn't leave a lot of quality budget, both on the assembly line and at the end of it.
One question though: does the shake table get any motion along its surface? In the "manual" testing, it seemed like you but the best result with sharp whacks on the side. That might have just been the tiny meter slipping in your hand and the mode selector getting bumped, though 😅
I would have to mount the meter perpendicular. I did this when running those pots but I don't have a way to run a meter in this axis.