My Valentine arrived today (sex in a box) - Page 1
Forum section: electronics / testgear

author: eurofox
author_rank: Unknown
timestamp: February 07, 2014, 12:12:47 pm
content: Hi guy'sAfter watching again the video from Dave about the Agilent 34461A I order one on Farnell online store.Increadible I got it the next day, those guys are really fast.Below a picture sitting on the top of he's older brother.eurofox

author: robrenz
author_rank: Super Contributor
timestamp: February 07, 2014, 04:32:00 pm
content: It wont be long before you agree that charting on a bench DMM is a must.

author: eurofox
author_rank: Unknown
timestamp: February 07, 2014, 05:39:07 pm
content: Quote from: mojo-chan on February 07, 2014, 04:08:51 pmYou probably got the wrong partner

author: eurofox
author_rank: Unknown
timestamp: February 07, 2014, 05:41:35 pm
content: Quote from: robrenz on February 07, 2014, 04:32:00 pmThe charting is simply genius, I use it a lot in data logging but on a multimeter is a complete new dimension.eurofox

author: neslekkim
author_rank: Super Contributor
timestamp: February 28, 2014, 04:03:07 pm
content: Is the availability good on these?, so far i have waited 14 days for mine, and the supplier still didn't get it in stock..

author: zapta
author_rank: Super Contributor
timestamp: February 28, 2014, 04:12:12 pm
content: Too many digits for one person.

author: robrenz
author_rank: Super Contributor
timestamp: February 28, 2014, 04:58:28 pm
content: Talk about digits, on the Keithley 2450 with the new firmware it has 100fV resolution.

author: wilheldp
author_rank: Regular Contributor
timestamp: February 28, 2014, 05:01:28 pm
content: What do you think the accuracy is on a 13.5 digit multimeter?

author: robrenz
author_rank: Super Contributor
timestamp: February 28, 2014, 05:52:30 pm
content: 0.1% + 150µV on that range 0.012% + 200µV on the 200mv range. The extreme resolution can be very educational when you are learning how your meter behaves without considering accuracy. Shorted input tests can show how stable the meter is and what affects the readings. I can tell you when the heater turned on and off by the nano volt variations graphed on screen. I can see triboelectric effects in the triax cable by measuring the current variations when I move the cable etc. Obviously this is all at high NPLC's and averaging to minimize noise content. My point is high resolution graphical trends can be more telling in many instances than lower resolution high accuracy graphs. To all instrument makers, don't cripple my meter by hiding the high internal resolution. I know the difference between resolution and accuracy.

author: cybermaus
author_rank: Frequent Contributor
timestamp: February 28, 2014, 05:53:11 pm
content: 100 femtoVolt?Lets see: 1Coulomb = 1Farad x 1VoltI think that means that if you have a 160uF cap and you add1 single electron, this meter can measure the rise in volts.Or am I messing up my exponents here?

author: eurofox
author_rank: Unknown
timestamp: February 28, 2014, 05:55:37 pm
content: Quote from: neslekkim on February 28, 2014, 04:03:07 pmFrom Farnell next day delivery

author: robrenz
author_rank: Super Contributor
timestamp: February 28, 2014, 07:48:02 pm
content: Quote from: cybermaus on February 28, 2014, 05:53:11 pmI just rechecked what resolution is saved to usb at different settings and I get a consistent 10pV regardless of NPLC or filter.Yet I have that file I posted a picture of at 100fV. Looks like a new firmware glitch

author: dc101
author_rank: Regular Contributor
timestamp: February 28, 2014, 10:10:35 pm
content: Nice, I actually just watched Dave's 34461A video this morning. I'm selling a piece of kit so I can buy a 34461A as well. Congrats.-Tim

author: tszaboo
author_rank: Super Contributor
timestamp: March 01, 2014, 10:49:05 am
content: Call me nuts, but I still prefer the 34410A, but ultimately the 3458A. I actually dislike the new screen, and the confusing menus.

author: neslekkim
author_rank: Super Contributor
timestamp: March 01, 2014, 10:58:41 am
content: that, and the 34401A is more expensive thatn the 34461A still, at least here.

author: HighVoltage
author_rank: Super Contributor
timestamp: March 01, 2014, 11:26:21 am
content: I am in Germany and two large German distributors had the 34461A on sale for 100 Euros below the list price, so I got one for my lab.Now I had the comparison to my 34401A and my 34410A and I must say, they all have their place and application.For most of my quick measurements I still prefer the 34401A or the 34410A but when it comes down to see how a measured value is changing over time, it is just amazing to use the 34461A. I built a buck converter and needed to look at the stability over time and had it running for a few days and then looked at the statistics and the graph and instantly you get a picture of what is going on. For this purpose, I really like the 34461A.

author: neslekkim
author_rank: Super Contributor
timestamp: March 05, 2014, 01:44:59 pm
content: Quote from: neslekkim on February 28, 2014, 04:03:07 pmGot mine today, need to clear my shelves now..

author: TiN
author_rank: Super Contributor
timestamp: March 05, 2014, 02:50:01 pm
content: QuoteIt's just a meaningless noise, as just a single resistor in normal environment (room temp) will have noise bigger by factors, than femtovolts.Even cryocooled JJA gives few nV of noise, leave alone bench system DMMKI2450 great SMU, but not a miracle

author: robrenz
author_rank: Super Contributor
timestamp: March 05, 2014, 03:57:46 pm
content: My extreme resolution comment was not referring to the bogus femtovolt readings. As pointed out later I was unable to store that resolution again. it only gives 10pV resolution so that was a firmware glitch that produced the fV readings.My comment refers to looking at the trend of the noise band and seeing thermal effects as in this 2 day chart with a total vertical scale of 716nV. You can see the daily thermal influence of both days.