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Keysight DMM - Yay or nay?

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Traceless:
@nctnico, @HighVoltage: I was about to pull the trigger on the 34465A but due to your comments, the positive things reported before and another video (link below) someone sent me via DM I'm reconsidering the DMM 6500 now. The video is german but showed at least two occasions where the DMM 6500 was clearly superior to a 34461A. I doubt though that the test results would have looked different on a 34465A:

1. at 7:03 the peak-to-peak current while switching on a light bulb is measured. Due to the super high sampling rate the Keithley caught the inrush current, which was missed by the Keysight.

2. 8:04 Because of the larger display and zoom the Keithley can display even weak signals that show as flat line on the 34461A. The Keithley also seems to offer higher resolutions on the time axis.

mawyatt:
We did a couple quick low ohms Kelvin (0.1 & 1 Dale 1% Chassis mount type) measurements 1/27 and 2/4 with a 2 year old and new KS3465A, a 6 month old DMM6500 and a 8 month old Tonghui TH2830 LCR meter. All meters used cheap Kelvin probes for measurements of low ohms (TH use supplied Kelvin probes), the 1 ohm resistor all readings agreed under ~1000ppm, 0.1 ohms under ~7000ppm. Repeatability from two dates was; older KS 5000/288, new KS 6300/400, DMM 2300/262, TH was 1900ppm/90ppm for 0.1 and 1 ohms respectively. No attempt was made to record the setup, temp or exact probes used, so variations were highly likely between dates.

Anyway YMMV,

Best

Kleinstein:
In that German video they just used a wrong PLC setting to do the peak current test. With a more reasonable setting the 34461 would have been done better and OK for the lamp. The 34465 is faster, than the 34461, though still not as fast as the 2nd ADC in the conversion rate as the DMM6500. However the DMM6500 has a limited BW (in some ranges relatively slow) and thus can not make full use of the high sampling speed of the 2nd ADC (digitizer mode). The faster ADC also has limited accuracy. At least the 2nd ADC allows a good digital AC mode.

The screen resolution is a bit limited for the KS meters and thus the somewhat limited screen shots.

Traceless:

--- Quote from: Kleinstein on March 04, 2022, 06:54:35 pm ---In that German video they just used a wrong PLC setting to do the peak current test. With a more reasonable setting the 34461 would have been done better and OK for the lamp.

--- End quote ---

I see, thanks for clarifying that.

Electro Fan:
Traceless, some more considerations for your decision.

Regarding capacitance which you mentioned in your original post, if you don't already have a LCR meter, the DER DE-5000 is an excellent meter that won't add a lot of expense on top of either a 34465A or a 6500.  It's always good to have a second device that can help you gauge the sanity if not the accuracy and precision of another device's measurements and the DE-5000 not only give you some reasonable accuracy, it will also measure some values that neither of the bench meters will measure.

If you can get the extra memory for the 34465A at no extra charge (if KS happens to be running the special or if you can persuade them or a distributor to throw it in) that would of course be good.  Having said that some considerations:  1) I think you can add the memory later.  2) with the standard memory you can still do a lot; I ran a test for about a week (probably more than most tests will need) with the standard 50k readings memory:
https://www.eevblog.com/forum/testgear/4-wire-2-wire-resistance-tests-various-cheap-kelvin-clips-various-meters/msg3256942/#msg3256942

And 3) if you have to pay 250€ or so for the extra memory that should be more than enough to buy a DE-5000.

Having said all that, I'm just an enthusiast and there are some much more experienced and capable folks here that can give you more insight on the details and the tradeoffs.

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