Products > Test Equipment

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

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floobydust:
I find a ton of 66kHz on mains from PC power supplies (office building) and a lot of FM radio (~100MHz) when I look with a spectrum analyzer.

mightyohm:
Is it just me, or is it surprisingly hard to find information on counts / resolution of the new Keysight meters?  It doesn't look like they've published this information in the datasheets or user manuals for the 34461A/34465A/34475A.

ruairi:

--- Quote from: floobydust on July 25, 2017, 05:40:00 am ---After seeing a simple capacitance measurement noisy and then perfectly quiet with no test leads, I wrongly assumed these have mains-SMPS contributing noise. What else could it be, as no other gear in the lab suffers from this.

Bought two 34461A's to replace aging 34401's and thoroughly disappointed.  Would not purchase again.
Sorry, I am not a fanboy of these meters.

--- End quote ---

Sorry if you detailed it earlier in the thread but what was your capacitor test?  I can try to repeat on my 34465a.

floobydust:
I'd been using a 47nF and 100nF disc capacitor. The least-sig digit is always bouncing around and worse if it also toggles the next digit., then you have two sig-digits bouncing around.
I connected the cap to the end of the test leads.

Compare with putting the cap (leads) right in the input jacks. I bend them into a "J" and poke them in.

This is with the (latest 34461A) firmware version: 2.14, Release Date: 2016-04-27;

Someone:

--- Quote from: mightyohm on August 08, 2017, 01:42:48 am ---Is it just me, or is it surprisingly hard to find information on counts / resolution of the new Keysight meters?  It doesn't look like they've published this information in the datasheets or user manuals for the 34461A/34465A/34475A.
--- End quote ---
In almost all situations the accuracy is much worse than the available resolution, so most users are not concerned with this as the readout resolution is excessive in their use cases (you can manually reduce the number of digits if desired). Otherwise there is a short section towards the end of the data sheet showing the tradeoff between digits and integration time.

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