Products > Test Equipment
Keysight's new 34465A (6.5 digit) and 34470A (7.5 digit) bench multimeters
Dr. Frank:
--- Quote from: radioFlash on March 11, 2015, 01:45:07 am ---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.
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Thanks for these great photos!
Wow, that VH102T resistor, hermetically sealed, is really a very stable one!
It has a guaranteed T.C. of +/- 0.8ppm/K, 0.2ppm/K typical, and a long term stability (no load) of 2ppm in 6 years, although it's not oil filled.
The resistance specification of the '365 / '370 are too wide (8ppm/yr. and 3ppm/K), especially as they really implemented some downsized form of the 3458A AUTOCAL function.
The 40k S012C resistor is not so stable, +/- 4.5ppm/K for this old C foil technology, but maybe used for the LM399H reference.
Frank
KedasProbe:
The person that came up with the name "Digitize Mode" at Keysight should be fired.
6thimage:
--- Quote from: radioFlash on March 11, 2015, 01:45:07 am ---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.
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Thanks for those photos. That fan shield doesn't look like it would do that much - I was expecting something a lot more substantial. The back of the front panel has a few extra passives on it, but I can't see what I was looking for on it. To support thermocouples, a temperature sensor is needed. I have heard that there is only one on, or near, the front connectors - I'm guessing it is on the far side of the front panel board, as I couldn't spot any on the measurement board.
I'd also be interested if you could get the part numbers for the flash and ram (on either side of the spear processor), as I wanted to know if they have increased from 128 MB (1 Gb).
6thimage:
--- Quote from: LaurentR on March 11, 2015, 05:59:16 am ---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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Looking in the manual (pages 133-134), when data logging to a file, the trend plot will act in the same way it does when it is in the continuous mode. When data logging to memory, however, you can use the zoom, pan and cursors. As you can only digitise to memory, I assume you can always use the zoom, pan and cursors (provided you are below the memory limit). I am not sure how the re-binning works for the histogram - the manual doesn't mention it.
SteveyG:
--- Quote from: G0HZU on March 11, 2015, 02:14:14 am ---
--- 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.
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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.
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We regularly use them remotely for logging etc. I guess it depends what you're designing.
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