Hameg HMO2024 baseline noise - Page 1
Forum section: electronics / general

author: madworm
author_rank: Frequent Contributor
timestamp: July 09, 2012, 05:16:13 pm
content: Does this look tolerable to you? Averaging seems to be off. I just wonder if a 1mV/div setting is useful when the noise level is about 10mV pp.At least it doesn't seem to pick up noise from its own power supply. There is a video about this on youtube, but for an HMO3524. And according to Hameg it did have a bad power supply.

author: saturation
author_rank: Super Contributor
timestamp: July 09, 2012, 05:24:30 pm
content: Its better to do this test with the probe off and shorted with a 50 ohm terminator, otherwise that probe configuration acts like an antenna and picks up noise. Is this at maximum gain?

author: madworm
author_rank: Frequent Contributor
timestamp: July 09, 2012, 06:54:07 pm
content: The antenna action was part of the 'experiment'. I wanted to see if it behaves like this one:Maximum gain setting is 1mV/div, the image shows 10mV/div - this refers to my previous post, not the video.

author: robrenz
author_rank: Super Contributor
timestamp: July 09, 2012, 07:33:39 pm
content: Just for reference my unmodified rigol 1052E with 50ohm terminator on @ 2mV/div, 5ns/div, AC coupled, BW limitoff, 1X probe comp, triggered for stable repetitive signal, measure mode Vpp bobbles 800 to 880 uV. with BW limitonand triggering the best it can on the signal (semi stable) it bobbles 320 to 400 uV pp.These are worst case. the values drop significantly if not triggering on the signal.

author: KedasProbe
author_rank: Frequent Contributor
timestamp: July 09, 2012, 08:39:11 pm
content: I will receive my new HMO1022 this week (100Mhz), I will let you know how it looks.BTW Your picture is a HMO2022 (2 channel) not HMO2024 (4 channel)

author: madworm
author_rank: Frequent Contributor
timestamp: July 09, 2012, 09:01:19 pm
content: Yes, I noticed. But I assume the HMO2024 has the same or a very similar power supply. Of course that is highly speculative. And it is not my picture, it comes from Hameg hardware support.But I have another source of very positive HMO2024 user experience. I contacted him and he's still very pleased with it.http://jeelabs.org/?s=hameg

author: anotherlin
author_rank: Frequent Contributor
timestamp: July 09, 2012, 09:52:00 pm
content: I own a HMO0722 (70MHz, 2 channel). I've already done the "shorted probe" test and I had a less than 1mV noise. I can post you a picture tomorrow (it is late!).I've already posted some screen caps with my HMO0722, no problem.https://www.eevblog.com/forum/product-reviews-photos-and-discussion/fft-high-precision-mode-with-hameg-hmo-vs-rigol-ds2000-scopes/https://www.eevblog.com/forum/product-reviews-photos-and-discussion/agilent-u3606a-%28dmm-dc%29-noise-on-dc-output/By the way, you seem to own an HMF2525 or 2550. I plan to get one, are they good ?

author: JoeyP
author_rank: Frequent Contributor
timestamp: July 10, 2012, 04:48:17 am
content: It looks to me like that is a 10x probe. If so, then the scope has probably detected it and adjusted the measurement/scale x10. In other words, the scope's actual hardware range is 1mv/div, so the noise referred to the input connector is <1mVpp, but referred to the probe tip it is 10x that value as indicated in the measurements. 1mv/div wouldn't be possible with a 10x probe. You are already looking at the most sensitive hardware range.

author: Rosendorfer
author_rank: Regular Contributor
timestamp: July 10, 2012, 01:48:26 pm
content: Quote from: madworm on July 09, 2012, 05:16:13 pmHi madwormCan see You do have very nice Hameg HMO scope...Is there a chance You could post some info on my "bit forgotten" thread about FFT @ high prcision with Hameg HMO scopes...https://www.eevblog.com/forum/product-reviews-photos-and-discussion/fft-high-precision-mode-with-hameg-hmo-vs-rigol-ds2000-scopes/I'm still looking for any info on that question...RegardsRosendorfer

author: madworm
author_rank: Frequent Contributor
timestamp: July 10, 2012, 01:58:25 pm
content: I don't have it yet! I got this photo from Hameg hardware support.And I won't be able to get it, before I have the refund from LeCroy (WaveAce 224...). And I don't know how long that will take... but as long as it does arrive eventually I won't complain.What about the user who posted the HMO2024 video on the forum? I think his website is wattcircuit.com

author: Rosendorfer
author_rank: Regular Contributor
timestamp: July 10, 2012, 05:46:34 pm
content: No luck ....So maybe KedasProbe would be interested in sharing about his new scope..??Quote from: KedasProbe on July 09, 2012, 08:39:11 pmAny chances KedasProbe..??Rosendorfer

author: KedasProbe
author_rank: Frequent Contributor
timestamp: July 10, 2012, 07:13:23 pm
content: I expect that my HMO1022 will be delivered on 11 or 12 July. (I have a TNT tracking number)I will have time to 'play' around with it over the weekend, maybe post a youtube video of the noise (since there are so few videos)Know any other good (mainly Hameg) forums?edit: My scope arrived today....

author: Fox
author_rank: Regular Contributor
timestamp: July 10, 2012, 08:29:02 pm
content: Here are two screenshots, i just took from my HMO1522One with 1mV/div and one with 10mV/div.The noise seems just fine too me, just keep in mind that the HMOs limit the bandwidth at vertical setting of 1mV/div and 2mV/div to 20MHz for the HMO072x and HMO102x models and to 100MHz for the HMO152x and HMO202x models.@KedasProbe don't be surprised these scopes are really tiny and compact ;-)Edit: Forget to mention no leads attached.

author: bernie
author_rank: Contributor
timestamp: July 10, 2012, 08:37:31 pm
content: After the good comments at JeeLabs and the review by Watt Circuit, I decided to go for a Hameg also.Reproducing the same scenario (lead attach and grounded) noise is approx 5mV.

author: KedasProbe
author_rank: Frequent Contributor
timestamp: July 10, 2012, 08:56:39 pm
content: Quote from: Fox on July 10, 2012, 08:29:02 pmThanks for the warningI'm planning to use the DVI connection to make it easier on the eyes. (DVI was a must have for me)

author: Rosendorfer
author_rank: Regular Contributor
timestamp: July 11, 2012, 04:14:48 pm
content: Quote from: KedasProbe on July 10, 2012, 07:13:23 pmHi KedasProbeAlready envy You the new scope.. have to be tons of fun...It could be bit OT in that thread but as I'm still looking for "low level" infos on HMO'sThere is some "low level" screen from my old DS1052E...800uV square wawe @ 1MHz ....Can HMO go much lover than that..??Rosendorfer

author: KedasProbe
author_rank: Frequent Contributor
timestamp: July 11, 2012, 06:19:32 pm
content: Hi,I will do a video during the weekend (maybe connect it to my projector)some screen-shots, only scope + probe HZ154 (1/10) was used, you can try to figure out what you are looking atHow do you take a screen-shot without the text for the save button on it?edit: found it the file/print key.

author: almoehi
author_rank: Contributor
timestamp: July 11, 2012, 07:12:45 pm
content: You install the HMExplorer-software from the enclosed CD or download it from the Hameg-website. After you connect your scope via USB with your PC you hit the Screenshot-symbol in the HMExplorer and voila, there is your screenshot.Ah, my mistake. Should have read your post thoroughly. Before takeing screenshot you hit the menu-button. This is the last grey softkey from the top right of the display.

author: KedasProbe
author_rank: Frequent Contributor
timestamp: July 11, 2012, 07:24:56 pm
content: I haven't installed the software yet (something for the weekend)In the manual it explains to use the file/print key (after setting it's action)

author: almoehi
author_rank: Contributor
timestamp: July 11, 2012, 07:33:21 pm
content: Don't expect too much from this litte software package - just good for taking screenshots. ;-)

author: chscholz
author_rank: Regular Contributor
timestamp: July 11, 2012, 08:22:15 pm
content: This is actually a very interesting question, paraphrasing a bit here: If "baseline noise" (i.e. the noise without any signal into the scope) is X mV, can I see a signal smaller than X mV?If the noise distribution of an oscilloscope would be Gaussian (or close to Gaussian). "baseline noise" would be a valid measure. Unfortunately that is not the case, scopes, and digitizers in general, have very "non-Gaussian" noise distribution! Easily to be verified by looking at the FFT of a channel without any input.Of course it is good to have low "baseline noise" but as a measure on how good the scope performs with a real signal "baseline noise" of rather questionable value.Quote from: madworm on July 09, 2012, 05:16:13 pm