Products > Test Equipment
Keysight's new 34465A (6.5 digit) and 34470A (7.5 digit) bench multimeters
Alex Nikitin:
--- Quote from: Dr. Frank on October 26, 2016, 11:32:16 am ---
;D ;D ;D ;D
are you able to measure the current source in 4W mode? I'd be interested in this failure mode, as KS probably won't give a feedback.
--- End quote ---
Unfortunately, I couldn't measure the current as our HP3458A is out for calibration, however from the data I've collected on other ranges it looks like the "jumps" are proportional to the measured value for a particular range (i.e. measuring 500 Ohm on 1K range gave me jumps of ~10ppm from 500 Ohm), and that reasonably confirms the current source problem. And I have the serial number recorded ;) .
Cheers
Alex
Alex Nikitin:
An update. I've received the replacement 34465A last week and it was on continuously for about 100 hours so far. I've run a log over the weekend measuring the LTZ1000 and the meter drifted about 4ppm down, however ACAL this morning returned the results to within 1ppm of measured by HP3458A previously. The resistance ranges are now nice and stable, the attached graph shows 1 hour log for two 34465A and HP3458A - all for NPLC 100 measuring my 10K LTC450C reference resistor (taken at different times, obviously, but with a fairly constant temperature in the lab for each run). Keysight UK was very helpful in resolving this problem. I aslo should get the 3458A Opt 002 back from them later this week so I will have a freshly calibrated reference.
Cheers
Alex
TiN:
Thanks for followup, Alex Nikitin. That was hell of a wacked meter before. Sorry for doubting your measurement skills :phew:.
HighVoltage:
What a huge difference between those two 3465A meters. Great that Keysight solved this for you.
But also a surprise, that your first meter has left the factory like that.
Alex Nikitin:
--- Quote from: HighVoltage on October 31, 2016, 03:15:30 pm ---What a huge difference between those two 3465A meters. Great that Keysight solved this for you.
But also a surprise, that your first meter has left the factory like that.
--- End quote ---
Yes, it was an unpleasant surprise. The second meter meanwhile has settled and does not drift as in first few days. Here is an overnight run using the same LT450C 10K resistor "standard", with the room temperature log as well. Vertical scale 1ppm/1C/div
Cheers
Alex
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