On 2020-04-10, at 22:05, victor smith <vcs3@...> wrote:
And actually price/performance might lead you to the hp 3457, they are ridiculously cheap.
(Full disclosure: I just got three more :-)
But they are full rack size units, like the 3456 also. And bench space is important, to me!
Well, the 3457A are rack width (425mm (16.75 ¡°)), but only 292mm (11.5 ¡°) deep (compare to 3456A at 527.1 mm (20? triple-barleycorns)). Compared to a 3456A (10.49 kg (23.13 lbs)), they are also very light (5.05 kg (11.1 lbs)), so they can be lugged easily to the place they are needed. The robust plastic case and the low weight also mean that it¡¯s a bit harder to damage them while lugging them around.
Disadvantage: the 3457A input resistance is 10G¦¸ only up to 3 volts, while the 3456a can do 12 volts at that input resistance. But then, in Ohms, 10 ?¦¸ resolution, where the 3456A is 100 ?¦¸. The 3457A can output up to 12 V in Ohms ranges, enough to fry many MOSFETs (so hello Harbor Freight(*) for that!), while the 3456A is slightly friendlier to your circuits at 9.5 V max. And so on.
And don¡¯t forget the 3457A are 3030000 counts [6.48 digits], so they have more than one bit more of resolution than the 1200000 counts [6.08 digits] of the 3456a. I still love the 3456A display, though¡ Only the Keithley 192/196 are even more beautiful. [Well, OK, Datron 10xx can¡¯t be beat, but those are not LED.]
Gr¨¹?e, Carsten
(*) OK, ANENG. And those are incredibly accurate for what they are¡
