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

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HighVoltage:
This 10V voltage reference was the Geller Labs SVR Series (Not the SVR-T)
I will hook up the SVR-T to the 33470A in the next few days to see, how it performs, will be an interesting comparison.




Vgkid:
It will be interesting to see the actual drift rates after a year. On paper the 34470a is rather close to my 3456a.

Andrew:
Upgraded my 34461 to firmware v2.08 and tried out the new capacitance feature.

I noticed the "numeral" display moving about quite a bit depending on the range and value, that is, not a particularly stable reading. Made a couple of very short banana-to-croc leads (100mm tip to tip) and connected a 1nF 1% foil cap.

The attached images are what I found using manual range switching on the "trend" display starting on the 1nF range then switching through 10nF ("kissing fish"!), 100nF and 1uF.

Trying different capacitor values from about 470pF through to 1000uF, and different capacitor types - ceramic, polyester, electro etc, I noticed the cyclic behaviour mostly in the 1nF to 1uF range.

Anyone experience similar variation with v2.08 or is this a very bad "pebkac" error? :)

And...

--- Quote from: KE5FX on March 21, 2015, 09:39:58 pm ---...first thing I noticed in the new 34461A firmware is that they screwed up the "4" character in the font...

--- End quote ---
...I don't like the altered "4" either. ;D

Cheers
Andrew

6thimage:
I don't think it's a pebkac - I've tried a poly cap and I get the same results (using sprung clips at the end of a metre long cable). I originally thought it was going to be an issue with certain capacitor types, but I don't think it is. Unfortunately, I don't have many through hole capacitors, which makes testing harder.

I've attached my version of what Andrew did, but condensed into a single trend plot - this is with a WIMA MKS-4 poly. The second attachment is the data (via CSV output) with the error margins as per the meter's specifications (61A) - I was wondering if the oscillations were within the error margins, which they are just for the 1 nF, but they aren't for the 10 nF range. There is no extra data in the gnuplot graph, the different ranges are done at different apertures / PLCs.

I did also notice that the measured value changes quite significantly between the 1 and 10 uF ranges, which is what the third image (screen 2) shows, with me creating a square wave by switching between the ranges (this was a tantalum cap).

I think part of the issue with the capacitance mode is that it is designed as an extra utility feature, rather than a main measurement mode - hence the lack of options with it. It also measures the capacitance by charging and discharging the capacitor (essentially using the ohms current source and voltage measurements), which means it will differ from meters those that use the frequency method. It also means that the measured value changes as the capacitor is charging (screen 3 of the attachments), I do wonder if this is considered in the accuracy specifications.

rosbuitre:
My 34461A

VISHAY-RODERSTEIN MKP-1837 10nF / 100VAC/160VDC, MKP-1837, Metalized Polypropylene, 1% Tolerance

Russian_NOS_Silver Mica - 1nF / 350V, Silver Mica Capacitor (SGMZ-A), 5%, Each


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