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| Brymen BM789 |
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| Neutrion:
--- Quote from: bdunham7 on September 25, 2021, 04:51:23 pm --- --- Quote from: Neutrion on September 25, 2021, 04:11:21 pm ---The treshold for continuity is between 100Ohm and 420Ohm. What is it? I can't think it is just accidentally so high. --- End quote --- It might be that they use a low test current. Unfortunately, continuity threshold is a spec that we will all never agree on, so the only solutions are to either live with what you get or find a meter that has selectable thresholds--which is pretty rare. --- End quote --- OK, but what is the case for high Ohm values? I found many discussions where it was pointed out that some meters have a too high test voltage (like the Fluke 87V with 7 V.) which sometimes can damage things but not much discussion about where you could use such a high Ohm value for continuity? I want to get now a(....searching for the term... ) "Choice-supportive bias or post-purchase rationalization" supportive oppinion. :) I only could think about getting through dirty contacts, or something like this. Now the meter is fast at continuity testing, so if I constantly read the display I can have an Idea that it is not a short, but than I could do it without the buzzer function as well. |
| Fungus:
--- Quote from: Neutrion on September 26, 2021, 10:14:43 am ---I found many discussions where it was pointed out that some meters have a too high test voltage (like the Fluke 87V with 7 V.) --- End quote --- All those discussions are wrong. It's not a test voltage, it's a test current, use Ohms law to figure out the voltage. In the case of the Fluke the maximum voltage is 7V. If Ohms law gives you a number higher than that in the previous step then it will be limited to 7V and the test current won't be reached |
| Neutrion:
So these are the discussions I found on this topic to not to start it again: https://www.eevblog.com/forum/testgear/multimeter-with-low-continuity-test-voltage/ https://www.eevblog.com/forum/eda/pcb-reverse-engineering/msg668285/#msg668285 https://www.eevblog.com/forum/testgear/what-do-you-think-of-the-new-fluke-87-v-max/275/ I know this is not an argument, but I am happier with a lower voltage. But still no good use for the high Ohm range!? :'( |
| vqtrong:
Hi, I just bought a new BM789. All functions are good. It is better then my Fluke 116 in measuring ripple voltage, as BM789 has Peak Hold (Crest). Just one thing I concern is it comes with version 06, which is not the latest version (08 atm). Is there any big update in 08 version? Is there any way to update to the latest firmware? And there is an icon (((D))) showing up in LCD if I follow this sequence: In AC mode --> Enable VFD --> Change to Hz mode --> Enable REC (Min, Max) |
| Neutrion:
That's strange. Can you go back to normal mode without any issues? Do the values change just like if the meter would work normaly? Or what does it do? I don't want to screw my meter by accidently entering into some calibration mode, though I have the FW version 08. "D" could stand either for "Dave", or maybe "detonator"? Does it counting back when you activate it? Just checking whether you can log into the forum a second time... It's also interesting that it also has the small lightning symbol like some other meter, but it never shows it. Some legal disputes with Fluke? |
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