Trying out my new Keithley DMM7510, a 7.5 digit beast - Page 1
Forum section: electronics / general

author: Circuitous
author_rank: Unknown
timestamp: July 01, 2015, 11:51:35 pm
content: New to the lab is this Keithley DMM7510, a 7 1/2 digit, high performance meter. This beast is amazing!Here I take a first look at the meter and run a few measurements.No teardown, since I paid for it!

author: HighVoltage
author_rank: Super Contributor
timestamp: July 02, 2015, 06:45:08 am
content: Great first impression Video, Thank you !Do you have a stable voltage standard and could see the drift of the 7510 over 24 hoursWould be interesting to see the graph for that.

author: HKJ
author_rank: Super Contributor
timestamp: July 02, 2015, 10:00:56 am
content: You need something very stable to see the drift of them 7510.I compared it to a couple of other meters with a cheap voltage standard:Reference used:

author: Circuitous
author_rank: Unknown
timestamp: July 09, 2015, 02:27:14 am
content: I finally ran a successful 24 hour test, I'll try to do a longer one some time.And, here's the setup. If you see anything to improve the tests, please let me know.

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: July 09, 2015, 04:00:46 am
content: Hi,You might want to look at using special low thermal emf leads. There is a thread here:https://www.eevblog.com/forum/buysellwanted/diy-low-emf-cable-and-connectors/I use Pomona low thermal emf leads with my Datron 1281.Regards,Jay_Diddy_B

author: HighVoltage
author_rank: Super Contributor
timestamp: July 09, 2015, 08:02:03 am
content: Quote from: Circuitous on July 09, 2015, 02:27:14 amThank you!Very nice, to test it with a SVR-T from Geller.I have exactly the same Geller voltage reference, so this can be a good comparison to my Keysight 34470A .What I would like to see is the same test with100 NPLCsetting of the 7510 over 24 hours,and the range manually set to 10 V, if you can.Could you also save the data to a csv or excel file?QuoteWhat I noticed in my test's is to keep all RF transmitter and receiver (WiFi, Cell-Phones) far away from the test setup.Otherwise, was was said already: special low thermal emf leads might be a good investment.

author: Andreas
author_rank: Super Contributor
timestamp: July 09, 2015, 09:02:56 pm
content: Quote from: HighVoltage on July 09, 2015, 08:02:03 am+1 .csv or .txt preferred.Perhaps you can put a cloth over the setup to prevent air currents from creating thermal noise.With best regardsAndreas

author: HighVoltage
author_rank: Super Contributor
timestamp: July 11, 2015, 09:22:44 am
content: Recently I tested my Geller Labs SVR-T with 3 Agilent meters at the same time in parallel:2 x Agilent 34461A1 x Agilent 34470AHere are the results in comparison after a 4h test.Manual setting to 10V range100 NPLCI am mostly surprised about the small spikes during the test, although everything was far away from any known RF disturbance.First Agilent 34461ASecond Agilent 34461AAgilent 34470AWhat I really like about your DMM7510 is that fact, that the standard deviation is shown in its nice units of nV instead of so many zeros. The DMM7510 seems to be a really amazing meter. May be you can produce a few more videos, showing the use of that meter.

author: Vgkid
author_rank: Super Contributor
timestamp: July 11, 2015, 03:18:59 pm
content: Thanks for that video.

author: Circuitous
author_rank: Unknown
timestamp: July 12, 2015, 03:27:37 am
content: Quote from: HighVoltage on July 11, 2015, 09:22:44 amThere will definitely be more videos, enough to bore everyone.Thank you all for the feedback. I'll get some low thermal EMF leads, and do another test when I can. I'll be getting back to some of my low-power measurements, which is why I bought this meter. I look forward to more critiques.Meanwhile, back to work (day job, every day).