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Keysight's new 34465A (6.5 digit) and 34470A (7.5 digit) bench multimeters

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Sparky:

--- Quote from: 6thimage on March 10, 2015, 11:01:55 pm ---
--- Quote from: Sparky on March 10, 2015, 05:56:05 pm ---Did anyone get the Digitize (DIG) option? I would love to hear what maximum sustained sample rate is possible when simultaneously transferring data to a PC with USB and LAN connections.

--- End quote ---

The datasheet says that the 34465/70A can do up to 40k readings/s in ASCII to the bus (LAN or USB connected computer). I have also been reliably informed that both LAN and USB have been tested at the maximum 50k readings/s but the data has to be in binary format (configured by the FORMat:DATA SCPI command - page 264 of the manual).

--- End quote ---

It's unfortunate, and I don't understand why, the instrument configuration for max readings/sec is not clearly stated.  One should not need reliable informants on-the-inside for the configuration that yields the publicly disclosed specs...

I hope it's just an oversight and Keysight publish it soon enough...

6thimage:

--- Quote from: Sparky on March 11, 2015, 12:28:22 am ---
--- Quote from: 6thimage on March 10, 2015, 11:01:55 pm ---
--- Quote from: Sparky on March 10, 2015, 05:56:05 pm ---Did anyone get the Digitize (DIG) option? I would love to hear what maximum sustained sample rate is possible when simultaneously transferring data to a PC with USB and LAN connections.

--- End quote ---

The datasheet says that the 34465/70A can do up to 40k readings/s in ASCII to the bus (LAN or USB connected computer). I have also been reliably informed that both LAN and USB have been tested at the maximum 50k readings/s but the data has to be in binary format (configured by the FORMat:DATA SCPI command - page 264 of the manual).

--- End quote ---

It's unfortunate, and I don't understand why, the instrument configuration for max readings/sec is not clearly stated.  One should not need reliable informants on-the-inside for the configuration that yields the publicly disclosed specs...

I hope it's just an oversight and Keysight publish it soon enough...

--- End quote ---

I'm also hoping that it is an oversight - the datasheet should have both the ASCII and binary data rates (the binary mode is new for the 34465/70A, I assume purely so they can get the required data rate). I'm guessing the people putting the datasheet together had a check list of things to include, with one being the bus reading rate - I don't think it occurred to them that there might be two different rates.

radioFlash:
Some additional detail photos. The Resistor R324 is a Vishay precision resistor marked as VH102ZT 10K000 1%. Also, I did notice a small fan shield after looking at it again. It's just a small piece of bent sheet metal.

G0HZU:

--- Quote ---Don't get me wrong -- I can certainly imagine having fun with that functionality and using it. I just wonder what a real professional would do with it.
--- End quote ---
Obviously, there will be valid uses (for some users) for these features but at my place of work the logging bench DMM is a rare sight in the engineering labs. I doubt many people have used one for logging because they are usually way too slow. Even in this thread people are hitting very slow sample limits.

The usual solution is to use multiple ADC channels to log lots of stuff in parallel and this is faster, cheaper, takes up less space and can usually be designed 'in' to a product or its test jig. DMMs offer high resolution when logging but this isn't really needed in our case. If we tried to do all the above with DMMs we would need loads of them on every bench and they would still be too slow.

We do sometimes use logging DMMs in the ATE section because the ATE guys tend to use tools like Labview so they prefer to just plumb stuff together quickly.

However, for home use it's pretty easy (as in highly convenient) to log stuff with a DMM if you just want to look at noise and ripple on a dodgy power supply over time. But some people might just use a PC soundcard instead with some spectrum analysis SW and look at the spectrum up to maybe 90kHz using freebie analyser software. Some SW can capture the data and produce a wav file for repeated playback. It can be a very powerful tool even if not calibrated.



LaurentR:
I am confused about the trend plotting in Data Log or Digitize modes. Is it available while logging or only when logging/digitizing is done? Does the graph get reset (and not redrawn) if you change the X axis? Can you also rebin the histogram without clearing it?

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