| Products > Test Equipment |
| Keysight's new 34465A (6.5 digit) and 34470A (7.5 digit) bench multimeters |
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| 6thimage:
Thanks Dave - that's helped identify U403 (the so8 above the NXP microcontroller) as a dual voltage comparator and tells us that the flash memory hasn't changed in size (still 128 MB, but with a different part number). Also the rs232 converter (U102) has changed brand from Maxim to TI. I think that's all we will be able to tell, without the front panel being removed. |
| KedasProbe:
--- Quote from: 6thimage on March 12, 2015, 11:13:35 pm ---...... But either way, firing someone for a name choice seems a little excessive. --- End quote --- OK, let's just reassign that person to marketing. Oh wait.......nevermind. |
| LabSpokane:
What is up with all the complaints about the fans? Do you guys have bionic hearing or something? Or do you have the meters backed directly against a ultra-noise reflective wall so all the noise is bouncing back to you? I have solid metal behind both my meters, so I should have the worst noise problem possible and both my meters are literally less noisy than a whisper. I'm sitting here with an iPhone dB meter (granted, not super accurate). My ambient noise level is approx 20dB - far quieter than any office I've been in - and having two meters running adds maybe 2-3 dB at the front of the meter. The keyboard that I'm typing on is noisier than the fans. My oscope's single fan is noisier than both fans combined. Yes, it's a bit higher frequency noise, but it's so far below any typical background noise, I can't understand all the complaints/comments/worries about it. |
| babysitter:
@Labspokane: About every Datasheet and application note for precise voltage stuff recommends against fans and suggests to supress any air drafts in the proximity as good as possible. The reason is preventing thermal emf in sensible areas. |
| LabSpokane:
Babysitter, I understand drafts, but this is constant, forced convective flow. And what's to say that HagilSight didn't test it both ways and found the fan better for most purposes? It just seems like a lot of what we call "armchair quarterbacking." If they didn't have a fan in there, everyone would be on here complaining that the device didn't come into thermal equilibrium with the test environment quickly enough. And my very modest experience with the devices are that once one measures in the 100 uV range, the lab and devices need to be as temperature stable as the meter anyway, so I still am not seeing the huge downside to the fan. It just seems like this huge assumption that the HagilSight failed to due their due diligence with the design, so the only remaining argument I could understand was noise. Just my 0.02 ... |
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