Products > Test Equipment

Will this 2V signal damage my bench multimeter over time?

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Kleinstein:
Full load lifetime may be less than 100.000, but the no load life time is usually higher. Connecting the 10 M ohms divider is essentially no load and switching between taps is even less.

The Panasonic Tx,  Zettler AZ850 and ASM850 as typical small relays give 100 million cycles for the mechanical life time. That is about 3 years 1 switching cycle every second. So a few clicks from probing by hand should not be an issue.

BeBuLamar:
I don't see a good logic for making the impedance changes automatically. If only one impedance is possible for all ranges then just default to that and have and option to manually switch to high impedance when you need it.

Martin Miranda:
... amaruk was still right...

WHY!? hahaha why there is a relay clicking!?  :-BROKE

Amaruk:
Thanks for the heads-up in regards to quite long life-span of relays in this type of application. Sounds good to me.

I just sent an email to the manufacturer to ask about this relay. Perhaps it is just a silly firmware bug.

However, I am quite surprised that this relay issue has not been mentioned before. But perhaps other users like me, use the DMM in auto-range mode most of the time. And every time you probe a 3.3V or 5V signal and hear the relay activate you think it is just changing from the 600mV range to the 6V range as one would expect. But alas, that is not what is going on as shown in my video above. Real range-changes are completely silent.

Fingers crossed that this is a silly firmware bug related to a relay for the input impedance or something like that. I will let you know what I find out.

Don't get me wrong - I love this DMM. I use it all the time!

Happy New Year!

tautech:
Some suspicions I have about this:
https://www.eevblog.com/forum/testgear/siglent-sdm3045x-enough-is-enough/msg3908639/#msg3908639

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