Vellan hps140i - Page 1
Forum section: electronics / testgear

author: tony3d
author_rank: Frequent Contributor
timestamp: September 09, 2013, 05:29:47 pm
content: Hi all, has anyone here used a velleman Hps 140 pocket scope. I want something small, and portable mainly to check amplifier clipping, and hobby checking. Seems like a pretty good deal for $130.00!Here's a link:http://www.hps140.com

author: Hydrawerk
author_rank: Super Contributor
timestamp: September 09, 2013, 06:42:55 pm
content: Well, this is really a basic scope. It is hard to find out what the LCD resolution is, but i think it ispoor 128×64pixels.I would prefer an old analog scope especially for audio measurements.

author: commongrounder
author_rank: Frequent Contributor
timestamp: September 09, 2013, 07:09:03 pm
content: I have one of these in my small tool bag. It is actually quite adequate for audio work. It reads directly in watts referenced to a selection of common audio load impedances. It has decent accuracy, and the trace is clear enough to see a clipped waveform. I can't speak to how it behaves at higher frequencies, though.The one thing to watch for when using it is the battery. There is no battery charge/level indicator, so you need to remember to have it plugged in to charge up before you head out, so it doesn't die out on you. I added a small good quality 9 volt wall wart to the kit for powering it while running it. There is no galvanic isolation between the BNC ground and the power input ground (there is actually a DC potential between them), so you shouldn't use the USB 5v to 9v boost charger while running it. Generally a.

author: tony3d
author_rank: Frequent Contributor
timestamp: September 09, 2013, 09:54:02 pm
content: Thanks. Sounds like for my purpose it should be fine. Notice it comes with a probe. Is the quality decent? Dose it have AC/DC coupling? I read somewhere that the trigger was useless, is that true?

author: commongrounder
author_rank: Frequent Contributor
timestamp: September 10, 2013, 12:24:00 am
content: The probe is basically one of those $12.00 ones that you can get on *bay. It is 1x and 10x, and has a plastic sleeve around the BNC connector to afford a tiny bit of isolation from accidental contact. It works fine for this scope, and I haven't felt compelled to swap it for something else. The scope has AC/DC selectable coupling. Triggering at high frequencies was a problem with an earlier version of the firmware (triggering is done in software on this device). I got mine after there was an improved version on the market and I have found triggering to be decent, even on most complex waveforms.

author: tony3d
author_rank: Frequent Contributor
timestamp: September 10, 2013, 10:24:21 am
content: Thanks so much for the detailed reply. Sounds like a good buy to me. I'm getting one.

author: tony3d
author_rank: Frequent Contributor
timestamp: September 12, 2013, 03:43:11 pm
content: Quote from: tony3d on September 10, 2013, 10:24:21 amWhere did you purchase yours from? They have it on Amason. Just concerned if there is something wrong, and it has to go back.

author: G7PSK
author_rank: Super Contributor
timestamp: September 12, 2013, 05:37:29 pm
content: I have one that was given to me as a present, I rarely use it, but I have used it to check the waveform of an alternator at both 240 and 415 volts using a 100 X probe, I put it on the floor prior to turning the power on and only touched the buttons with a plastic stick, but it survived and told me what I wanted.I guess for some hobby and audio work they are fine, The menu system is a real chore to use and an old CRT is probably the best thing to start with for learning purposes.

author: Hydrawerk
author_rank: Super Contributor
timestamp: September 12, 2013, 09:19:58 pm
content: Any digital scope with 8-bit ADC (that is 256 levels) should have a QVGA screen 240×320 or so... Not 128×64.

author: eurofox
author_rank: Unknown
timestamp: September 12, 2013, 09:42:17 pm
content: It is not Vellan but Velleman, the HQ of this company is about 15 Km from my placehttp://www.velleman.eu/contact/eurofox