Products > Test Equipment
Keysight's new 34465A (6.5 digit) and 34470A (7.5 digit) bench multimeters
mightyohm:
--- Quote from: Someone on August 08, 2017, 04:32:02 am ---In almost all situations the accuracy is much worse than the available resolution, so most users are not concerned with this as the readout resolution is excessive in their use cases (you can manually reduce the number of digits if desired). Otherwise there is a short section towards the end of the data sheet showing the tradeoff between digits and integration time.
--- End quote ---
Ok, that makes sense. Maybe this is a dumb question, but given that the accuracy specs across many ranges are the same between the 34465A and 34470A, why pay for the extra digits?
Edit: I should clarify, I was looking at the current ranges. The voltage measuring accuracy of the 70A is considerably better than the 65A, so I assume that's what folks are paying for.
cellularmitosis:
Yeah, this is much more cryptic than it used to be. Compare the 34401a manual to the 34465a manual:
Someone:
--- Quote from: mightyohm on August 08, 2017, 05:48:12 am ---
--- Quote from: Someone on August 08, 2017, 04:32:02 am ---In almost all situations the accuracy is much worse than the available resolution, so most users are not concerned with this as the readout resolution is excessive in their use cases (you can manually reduce the number of digits if desired). Otherwise there is a short section towards the end of the data sheet showing the tradeoff between digits and integration time.
--- End quote ---
Ok, that makes sense. Maybe this is a dumb question, but given that the accuracy specs across many ranges are the same between the 34465A and 34470A, why pay for the extra digits?
Edit: I should clarify, I was looking at the current ranges. The voltage measuring accuracy of the 70A is considerably better than the 65A, so I assume that's what folks are paying for.
--- End quote ---
I think you've come to the conclusion yourself, a higher model might only be improved in some areas and not all. This is common across multimeter series both bench and handheld.
Dr. Frank:
--- Quote from: mightyohm on August 08, 2017, 05:48:12 am ---
Ok, that makes sense. Maybe this is a dumb question, but given that the accuracy specs across many ranges are the same between the 34465A and 34470A, why pay for the extra digits?
Edit: I should clarify, I was looking at the current ranges. The voltage measuring accuracy of the 70A is considerably better than the 65A, so I assume that's what folks are paying for.
--- End quote ---
Please read inside this thread, that the 34465A and the 34470A are virtually identical in hardware, and also in performance.
The only physical difference is the voltage reference, i.e. LM399 versus LTZ1000A, respectively.
That makes the '470A more stable and less noisy in DCV, as reflected in the specification, and by our common noise measurements.
All other parameters are identical, and over the bus, the resolution of both instruments is identical, too.
This is in contrast to the resolution specification in the user manual.
The '470A displays 7 1/2 digits in most, but not all modes, when using the instrument 'on the bench'.
But this additional resolution has nothing to do with accuracy or stability, see my review of 465A vs. 470A, also:
https://www.eevblog.com/forum/testgear/keysight's-new-34465a-(6-5-digit)-and-34470a-(7-5-digit)-bench-multimeters/msg889215/#msg889215
Therefore, you pay double the price for an LTZ1000A reference (about 350$ as spare part), and the 7 1/2 digits feeling, only.
Frank
tomeo.gonzales:
It is possible to buy the reference from 34470A and use it in 34465A for better noise and stability performance?
The part number for reference is 34470-66303 (PCA, Reference, Tested) and on Keysight web site they say:
Products using part 34470-66303
•34465A
•34470A
So it seems they have a single part number for both devices.
The price is 381$
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