Rishab 410 Multimeter Tear down - Page 1
Forum section: electronics / testgear

author: aniket
author_rank: Contributor
timestamp: July 19, 2016, 05:48:08 pm
content: Hi this is Aniket from mumbai India . I am diy enthusiastic and often look for cheap and reliable test gear to work on my projects . I recently had the need of buying a multimeter but was very short on money .... I had roughly 30-35$ or roughly 2000- 2275INR to spare & after watching daves video on cheap chinese mutimeter , and how bad they can be without any input protection I refrained from buying them . After a short search i narrowed my selection to Rishab 410 ... it costed me roughly 30$ or 2000 INR ... and I am very happy with the mutimeter as it has all the necessary input protection including the HRC fuses ..Here are some pics

author: aniket
author_rank: Contributor
timestamp: July 19, 2016, 05:51:36 pm
content: some more pics

author: pascal_sweden
author_rank: Super Contributor
timestamp: July 19, 2016, 06:41:11 pm
content: Here is a link to the specifications, to make it easier to judge the performance:http://www.rishabh.co.in/index.php/products/product/290

author: aniket
author_rank: Contributor
timestamp: July 19, 2016, 06:54:07 pm
content: thanks for posting the link to the datasheet, i tried uploading the datasheet but was unable due to the size limitation ....regardsAniket

author: retiredcaps
author_rank: Super Contributor
timestamp: July 19, 2016, 09:27:00 pm
content: Thanks for sharing pictures of your meter. I love to see the insides of different meters that are made all over the world. For $30 USD, I think the meter represents good value in your country.Some comments.PROs====- input protection seems adequate with 2 blue MOVs, one spark gap, and I'm assuming two PTCs in the heatshrink?- there seems to be a thick/thin film resistor network hopefully for some long term accuracy/stability- it has the Gossen range switch internal wiper mechanism, not surprising as Rishab was making Gossen meters in India under their own brand name as perhttps://www.eevblog.com/forum/reviews/rishabh-multimeters-from-india-(-open-house-discussion-)/- the automatic block shutter is good to prevent an oops moment- name brand SIBA fuses- AA cells- soldering quality looks decent- looks like it is conservatively or properly rated at 1000V CAT II/600 CAT III, at least somewhat believable vs the no name crapCONs====- through hole electrolytic caps of dubious quality (I can't quite make out the name of the manufacturer)- non standard spacing of input jacks- somewhat confusing user interface with symbols on the bottom of the selector dial- red rotary knob has no obvious pointer to show is selected. A white or black dot at the end would help a lot- multiple off positions means possibly waiting for the meter to reboot while switching from one function to another- surprisingly only 300 hours battery life from 2 AA cells implying a roughly 8mA current consumption assuming 2500mAh AA cells- the bottom of the multimeter looks like the design was copied from Gossen and the top half of the multimeter looks like it was copied from a low cost DMM maker

author: Hydrawerk
author_rank: Super Contributor
timestamp: July 19, 2016, 11:12:56 pm
content: QuoteThis is inspired by Gossen Metrawatt multimeters.AniketI like your DMM. Is it also distributed in Europe?

author: aniket
author_rank: Contributor
timestamp: July 20, 2016, 08:28:02 am
content: I think Rishabh has distrubutors in Europe .check out this linkhttp://www.rishabh.co.in/index.php/where_to_buy& i will check out the capacitor brand and report back ...and i think it has auto power off functionregardsAniket

author: PedroDaGr8
author_rank: Super Contributor
timestamp: July 20, 2016, 01:31:44 pm
content: Quote from: Hydrawerk on July 19, 2016, 11:12:56 pmRishabh used to be the licensed Indian subsidiary of Gossen. Due to Indian domestic ownership laws companies have to have a locally licensed affiliate or something like that a la Maruti Suzuki. I don't know the exact details. Gossen and Rishabh had a big time falling out though. IIRC Rishabh began copying more of Gossen's stuff than their license allowed. Something like than and Gossen pulled the plug. Rishabh kept selling the rest of their Gossen units (I think it ended up resulting in a lawsuit). So there are heavy intimate ties between Gossen and Rishabh.Much of Rishabh stuff is very similar to a generation or two ago Gossen technology. This is evident by the large package on the multimeter IC and the through-hole components. Build quality looks good enough overall though.

author: aniket
author_rank: Contributor
timestamp: July 20, 2016, 04:07:59 pm
content: Quote from: Hydrawerk on July 19, 2016, 11:12:56 pmYep the caps are of a dubious brand named "Jackcon" but are rated at 105c , but that doesn't matter as these caps will never see any high ripple current or encounter high temp , these caps are only for decoupling purpose I guess ....

author: Hydrawerk
author_rank: Super Contributor
timestamp: July 20, 2016, 04:10:47 pm
content: Quote from: aniket on July 20, 2016, 08:28:02 amSorry, I could not find any actual distributor name. There is only an email address.marketing(at)rishabh.co.in

author: aniket
author_rank: Contributor
timestamp: July 20, 2016, 04:13:48 pm
content: My intend of posting this tear down is for engineers like me who are always short on money and look for good cheap test instruments to follow their passion and hobby .... I think rishab makes good multimeters atleast good enough for me..RegardsAniket

author: aniket
author_rank: Contributor
timestamp: July 20, 2016, 04:15:00 pm
content: Quote from: aniket on July 20, 2016, 04:13:48 pmOk let me check , reverting back shortly

author: aniket
author_rank: Contributor
timestamp: July 20, 2016, 04:18:54 pm
content: Seems you are correct , they have only one email mentioned, ok I will write to them can you tell me where exactly in Europe you are looking to purchase this multimeter.

author: Hydrawerk
author_rank: Super Contributor
timestamp: July 20, 2016, 04:33:51 pm
content: These DMMs look like serious instruments for professionals. Not a toy-like UNI-T.http://www.rishabh.co.in/index.php/products/index/0/13

author: Connoiseur
author_rank: Regular Contributor
timestamp: July 20, 2016, 05:07:58 pm
content: Good job aniket!I was itching to see the inside of rishabh multimeters.The design seems old but reliable, type of stuff which is favoured in most Indian industries.There's one more good multimeter manufacturer by the name 'Motwane'. That too is quite affordable with adequate safety features.

author: aniket
author_rank: Contributor
timestamp: July 20, 2016, 05:27:04 pm
content: is motwane good !!! i though they just re brand chiness stuff just as MECO , Metravi, MEtroQ does .."I might be wrong "there is one company out of kolkata that manufactures or used to manufacture good stuff

author: Hydrawerk
author_rank: Super Contributor
timestamp: July 20, 2016, 06:53:57 pm
content: This is a rebadged Unitrend DMM. Probably UT70D.http://www.motwane.com/DM3540A.aspx?catid=24&id=1087&submenuheader=0&vid=%3C%=Request.QueryString[%22vid%22]%%3E&catname=General%20Purpose%20Measurement%20Products&cat=%3C%=lblvoltage121.Text%%3E

author: pascal_sweden
author_rank: Super Contributor
timestamp: July 20, 2016, 07:09:32 pm
content: Regarding Rishabh 6016, and Rishabh 6015. I could not spot the difference between both from the table, as all items in the table seem to be the same for both models. Did I miss something?

author: aniket
author_rank: Contributor
timestamp: July 20, 2016, 07:21:47 pm
content: the frequency bandwidth is different for 6015 & 6016 .. that is the only difference i see

author: pascal_sweden
author_rank: Super Contributor
timestamp: July 20, 2016, 07:29:03 pm
content: Rishmulti 20 seems to be the best one, if you don't need data logging.This one has 5 3/4 precision for DC measurements, which is pretty impressive!If you need data logging, Rishabh 6016 seems to be the best model.But what is the precision for that meter? I can only find the amount of readings for logging.Can you get a reference sales price in USD for both of these models, to have an idea on the price?

author: aniket
author_rank: Contributor
timestamp: July 20, 2016, 08:06:11 pm
content: 6016 goes around for 266$ and 6015 goes around for 232.50$ , this is with a conversion factor or 1$= 67INRSent from my Lenovo A7010a48 using Tapatalk

author: pascal_sweden
author_rank: Super Contributor
timestamp: July 20, 2016, 10:34:18 pm
content: How much for the Rishmulti 20?

author: Wytnucls
author_rank: Super Contributor
timestamp: July 20, 2016, 11:31:25 pm
content: http://www.indiamart.com/mohnotinstruments/digital-meter.htmlUSD210.00

author: Connoiseur
author_rank: Regular Contributor
timestamp: July 21, 2016, 02:32:34 am
content: Quote from: aniket on July 20, 2016, 05:27:04 pmNot sure about the new models but I have seen an old one in my company that has a tuv certification. I'll post the exact model no. later as I don't remember it now.Yeah you're correct about kusam meco, meteoq and others. The build quality is pathetic even though they are not dirt cheap. The case starts falling apart from the first day itself. Not worth buying.

author: aniket
author_rank: Contributor
timestamp: July 21, 2016, 04:04:22 am
content: Check out Waco they seem to be a good brand .....Sent from my Lenovo A7010a48 using Tapatalk

author: Connoiseur
author_rank: Regular Contributor
timestamp: July 21, 2016, 12:50:36 pm
content: Got it. It was 'Motwane' DM 454 and it is CAT II rated to 1000V (TUV certified to IEC 1010). Couldn't find it on the manufacturer's website, may have been discontinued.