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

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HighVoltage:

--- Quote from: 6thimage on March 21, 2015, 10:07:45 pm ---It is similar on mine - using the web interface you can find out the calibration date, which for mine is showing as "Last Calibration Date: Tuesday, January 1, 2013", despite the fact mine was calibrated on the 19th April 2013.

My guess is that the time since the last calibration requires the meter to store the date in a difference place to the cal string - so next time you get it calibrated, the time display should be correct.

--- End quote ---

My  34461A also shows 809 days and that might be right.
The 34470A shows 27 days since last calibration.

HighVoltage:

--- Quote from: TooOldForThis on March 22, 2015, 02:18:52 am ---I did some quick capacitance measurements using the 34461A's new feature compared to two other devices.

With the more instruments I get, the less know about the parts I'm measuring. 

 
Notes:   
* The 34461 initially measured a 100nF cap at 81nF but it slowly crept up to 85 over a few minutes.
** The DM3068 jumped all over the place with pF range cap.

--- End quote ---

The datasheet only claims 0.5% accuracy for capacitance and in the lowest readings only 1%
May be it is not meant to be a replacement for a capacitance meter and only gives us an indication

LA7SJA:
Completely free and worth every cent if you ask me  :-+. DC + AC is bordering useless  |O, but the other improvements are very good for the price and makes my 33461A even more useable. So all in all I am satisfied. Also remember that if you do not get the one you love, you just have to love the one you get.
 
Johan Fredrik.

AndyC_772:

--- Quote from: TooOldForThis on March 22, 2015, 02:18:52 am ---I did some quick capacitance measurements using the 34461A's new feature compared to two other devices.

With the more instruments I get, the less know about the parts I'm measuring. 

--- End quote ---

Just for a giggle, I tried repeating your experiment, using a cheap 100nF leaded capacitor.

Averaged over 157 samples, my 34465A quotes a mean value of 106.87nF and std dev of 0.07nF.

My Fluke 89 IV says 103.5nF.

My Fluke 289 says 106.5nF. All so far, so good.

However: my HP 4395A impedance analyser can't make head nor tail of it. The cap's amplitude and phase response above a few MHz is repeatable but complicated, making the equivalent circuit very sensitive to small measurement errors. Each time I press the button which calculates an equivalent circuit for the connected device, I get a different answer, and the answers only really agree on the cap's resonant frequency, which is about 5.42 MHz.

If I limit the analysis to 500kHz, I get C = 97.64nF, ESR = 53.6mOhm, and ESL = 13.1nH.

Not sure what the moral of the story is here, if there even is one. Probably something about measuring components under conditions which reflect how they'll actually be used. Also, a cheap 100nF leaded capacitor makes a crappy decoupler.

dadler:

--- Quote from: TooOldForThis on March 22, 2015, 02:18:52 am ---I did some quick capacitance measurements using the 34461A's new feature compared to two other devices.

With the more instruments I get, the less know about the parts I'm measuring. 

 
Notes:   
* The 34461 initially measured a 100nF cap at 81nF but it slowly crept up to 85 over a few minutes.
** The DM3068 jumped all over the place with pF range cap.

--- End quote ---

I seem to trust my DE-5000 for accurate capacitance readings over any of my various DMMs. The DER EE unit is cheap but built for the purpose. The fact that capacitance was added to the 34461a with a firmware update leads me to believe this is just an add-on, nice to have convenience feature.

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