| Products > Test Equipment |
| Keysight's new 34465A (6.5 digit) and 34470A (7.5 digit) bench multimeters |
| << < (23/145) > >> |
| LaurentR:
Sold my Keysight lead set on EBay. Agree that the various Fluke sets are much nicer. The one thing the Keysight have for them is that they are seriously thick (16ga!), which make for a 15A rating and lower resistance than anything Fluke I have. |
| radioFlash:
Here are some photos of my 34465A. It's using an LM399 voltage reference as expected. |
| radioFlash:
And some more photos: Full size of the top side of the PCB and detail of of the top of the PCB towards the rear. The PCB is already on Rev4. It looks a little messy around the input selector switch--doesn't look like they bothered to clean the flux. |
| radioFlash:
And a photo of the voltage reference. |
| 6thimage:
Thanks radioFlash they are very useful - I'm guessing you've removed the shield which sits above the voltage reference, is there also a fan shield of some sorts? I'm a little surprised to see the LM399, as I was under the impression that the 34465A and 34470A had the same reference. Your board's revision is 4 the same as what is used in the 34461A, although it has a different model number. I originally thought the only difference would be the population of components, but yours has some extra footprints and some changed parts. I've combined one of your images with one from Dave's teardown. But the changes I can see are: * populated relay at K201 * resistor at R324 (looks like a crystal, left of the LM399) * U202 - AD8638 (auto-zero rail-to-rail op-amp) * U203 - TL071C (JFET op-amp) * sot-23 at U111 * resistor (R116) on the right hand side of U110 * resistor R318 left of K201 * change of package (& possibly precision) for R231 (in between relays) * relays changed to Omron brand Is there any chance you could take a picture of the back of the front panel? |
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