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Keysight's new 34465A (6.5 digit) and 34470A (7.5 digit) bench multimeters
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LA7SJA:
I can't replicate this on my 34461A running 2.11 but here is the changelog for 2.11 (#2 could be of interest)


34460A/34461A/34465A/34470A Revision 2.11 Enhancements and Fixes
1. Resolved an issue which caused capacitance measurements to intermittently fail with high offset voltages present.
2. Removed/resolved a 3 ppm reading shift that occurred in DCV measurements on the 100V and 1000V ranges when Input Z (impedance) is switched between 10M and Auto.
3. Resolved a Windows Application Error that occurred when LAN service VXI-11 was disabled and power is cycled.
4. Resolved a lock-up condition that occurred during frequency measurements using trigger settings TRIGger:DELay MIN and *TRG.

Firmware, release notes and tools:
http://www.keysight.com/main/software.jspx?ckey=2367633&lc=eng&cc=TH&nid=-536902435.1058513&id=2367633

Johan-Fredrik
Dr. Frank:
This bug should have been fixed with 2.08 already:

34460A/34461A Revision 2.08 Enhancements and Fixes
..
4. Resolved a trend chart scaling defect in which readings would incorrectly appear outside of the vertical scale limits.

The 2.11 fix #2 is not related to the trend chart display, and only shows up in the 100V and 1kV DC ranges.
It's a real measurement fault, which can be displayed in the trend chart as a 3ppm step up/down, each time one toggles the Impedance switch.

Therefore I recommend to upgrade to 2.11, also to make sure, that any known scaling errors are removed.

Frank

PS: Another ~ 10ppm error in the 100V and 1kV DCV range has been found, due to erratic setting of the divider heater.
This has been confirmed by Keysight and is currently under investigation for FW correction.

I hope, that this is also the root cause for the ~ +10ppm ACAL error in these ranges.
 
HighVoltage:

--- Quote from: bson on February 12, 2016, 08:26:50 am ---
34465A, firmware is 02.08 and I'm wondering if updating is known to fix this...

--- End quote ---
I can also confirm, that this is not a problem anymore in the latest firmware.
This was really troubling me in my first 34461A and I am glad it was solved.
 
Edit:
Added picture of a trendchart from a 10V reference
bson:
02.11 looks much better!  But maybe still not quite perfect...



The average is 10.000022 but assuming the Y axis labels are 10.00000, 10.00010, 10.00019 then the graph is too high.  It shows points at 10.000040 and higher, which is above the max value recorded.  This is the case even if the bottom tick is actually at 9.99999 - but then we have TWO errors instead of one...

Dr. Frank:

--- Quote from: bson on February 13, 2016, 07:49:27 am ---02.11 looks much better!  But maybe still not quite perfect...



The average is 10.000022 but assuming the Y axis labels are 10.00000, 10.00010, 10.00019 then the graph is too high.  It shows points at 10.000040 and higher, which is above the max value recorded.  This is the case even if the bottom tick is actually at 9.99999 - but then we have TWO errors instead of one...

--- End quote ---

Well, the problem is, that the graphs scale has 5 digits of resolution only.

So your assumption is very probably wrong. The scaling is 10.00000, 10.00005, 10.00010.
10.00019 as an upper limit would have been rounded to 10.0002, instead.

I recommend to manually scale the y-axis, so you will have better control of the limits.

Frank

Btw.: Received FW 2.12 today. Problem fixed, but not yet the ACAL issue.

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