Mastech MS-8233E, MS-8240D and MS-8250C

[ales22]

OK, here is the hack for MS8250C default DC range. Use at your own risk, it's just a quick hack, resistor values pulled from my arse 
This meter uses rotary switch and diode logic to create 5 signals for main IC driving the ranges. That one at D19 & D17 is SLACDC. So I removed these two dual diodes, which disconnects the SLACDC pin from rotary switch. Conveniently, there is a negation of the new desired signal as output of the rotary switch at D18, so transistor inverter will do the job. There are more than one supply voltage, that's why the 15k pull up is connected to GND. The  better device would be some logic gate in small package, but they are almost unobtainium (here where I live) and definitely more expentive than few scraped parts. Have fun.

[iloveelectronics]

edit: @iloveelectronics I guess MS8250D is a typo and you meant C ? (Mastech website doesn't mention any D version of the MS8250)

Yes, the "D" was a typo, I meant "C".

OK, here is the hack for MS8250C default DC range.

Nice hack! I might try that on my own unit!

[uncle_sem]

MS-8240D - This is the mysterious brother of the Uni-T UT61E which some people knew existed but rarely (if ever) seen in real life! It uses the same Cyrustek ES51922A chip that the UT61E uses, so basically it offers the same performance, accuracy and resolution. What sets it apart from the UT61E is that it has implemented most of the features that the UT61E lacks, namely the backlight, MAX/MIN (besides PEAK), Auto Power Off and ability to turn off USB data logging.

but how they made "light/pc-link" button? some microcontroller inside, or different es51922 chip firmware?

[JohnyRo]

I'm very interested in the MS-8250C, but I have a few concerns.

It has vanished from the manufacturers website. It used to be here: MS8250C AUTORANGING DIGITAL MULTIMETER
I managed to pull that out from Google cache. The A and B variants are still available. The website is atrocious and I can't find the English manual on it or anywhere else. I also find it's not at all popular, so I can't rely on community support, like UT61E has.

So despite it matching my needs perfectly: mucking around with Arduino, USB data logging and NCV, I'm not confident in buying it.

On the plus side the Cyrustek ES51968 spec sheet should be enough in lieu of a manual and the meter is supported by UltraDMM, so someone, somewhere made it work.

So what I'm asking for is reassurance from owners, suggestions for alternatives, the manual, anything basically. I have considered a UT61E and UT139C combo previously, but that's an overkill and too expensive for my current needs. I'm (kind of) limited to $USD 70 per item by customs regulations and I'd much rather buy only one at the moment.

[torr032]

edit: @iloveelectronics I guess MS8250D is a typo and you meant C ? (Mastech website doesn't mention any D version of the MS8250)

Yes, the "D" was a typo, I meant "C".

OK, here is the hack for MS8250C default DC range.

Nice hack! I might try that on my own unit!

I see there is a MS8250 "D" version now on the manufacture site but still no where to be found for sale .  Frenky, is his continuity latched or unlatched, can you please try to remember? And does it overshoot on voltage range?

[Armitas]

Hi,

I know this request is not belong the topic, and I ask for forgive me,

My 8250c is not connecting with the windows software, somebody could help me? Im trying to test with a fresh copy of the software but I cant find nowhere to get it.

Somebody could give me a copy or link to download?

I already ask p-mastech but they no answer.

Please.

Thanks in advance.
Regards from Spain

Harold Armas.