| Products > Test Equipment |
| Keysight's new 34465A (6.5 digit) and 34470A (7.5 digit) bench multimeters |
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| floobydust:
Really?! After the cooling fan roar, as my first multimeter ever with a fan >:( I assumed Keysight went SMPS for small size. This would be good news. So it probably has a line-filter with Y-caps then. |
| TheSteve:
--- Quote from: floobydust on July 25, 2017, 01:41:10 am ---Really?! After the cooling fan roar, as my first multimeter ever with a fan >:( I assumed Keysight went SMPS for small size. This would be good news. So it probably has a line-filter with Y-caps then. --- End quote --- So you just decided to post that they have a SMPS without actually looking? That is a pretty bold statement to make, a little research wouldn't hurt next time. The Keysight frequency counters, AWG's etc use a SMPS, the DMM's are all linear. The fan on my 34461A is pretty darn quiet, it is actually the least noisy of all of my fan equipped gear - but I'd still prefer it didn't have a fan and it doesn't seem to need it in a cool environment. |
| floobydust:
I'm wrong, Dave's 34461A teardown pics show a power transformer and looks like POL buck converters. After seeing a simple capacitance measurement noisy and then perfectly quiet with no test leads, I wrongly assumed these have mains-SMPS contributing noise. What else could it be, as no other gear in the lab suffers from this. Bought two 34461A's to replace aging 34401's and thoroughly disappointed. Would not purchase again. Sorry, I am not a fanboy of these meters. |
| TheSteve:
It's too bad they don't meet your expectations. When the 3446x series was released they didn't even have capacitance measurement, it is quite possible it was a bit of an after thought. Also noteworthy is that the 34460A does not have a fan in it, only the higher models do. |
| MrW0lf:
Just as side note... Even mains power today is mostly much more than power. Here we have this: Can imagine it can create all sorts of weirdness due to intermittent nature. |
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