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Mastech MS5308 LCR meter with ESR measurement - on discount at the moment
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PA4TIM:
Maybe I misunderstoot, English is not my native tongue. He wrote: the LCR Meter is manufactured in Taiwan under our direction. I thought that that means they own the factory so ( a directeur in Dutch is the boss/owner of a company, so i think Direction means they own that company but you are frim the US so you can tell. So it is a construction like the Agilent multimeters ? ( allthough Agilent later bought that company)

Fact is, if they designed it or not, or maybe partly, it lives up to the hight IET standards and that is what matters for me. But do  I understand it well, you have it now for over a year ? And you are still satified ?

Hope it arrives soon and I'm anxious to know how accurate it meaures my standard ( GR, ESI, Philips, HP) and against the Boonton 63H, GR1620, GR1608 and VNA
Alltough testing inductors does not make much sense because selfinductances varies rather much under voltage, current, frequency and DC bias.

robrenz:
I am very satisfied with the DE-5000. Like you, I did a lot of research on what was available and even called IET to find out how a US company with their reputation could sell a meter at this price point.  The Agilent U1733C had a lot of adjustable user interface features that are very nice and slightly better banner spec. But I could not get past the total lack of 4 wire connections and the poorer low ohms performance.

I compared the DE-5000 to my calibrated LOM-510A micro ohm meter on a nominally 50mOhm resistor.  LOM-510A reads 58.76mOhm (max error +/- 35uOhm) and the DE-5000 in series resistance mode at 1kHz reads a very slow bobble between 58-59mOhm and it is on 59 most of the time.  This is with my kelvin connectors shown here http://youtu.be/wwgO6Lg4RZM?t=50m12s added to the tweezer or alligator clip adapter box.  the alligator clips that come with the unit are not kelvin even though the source and sense are kept separate all the way to the clip.

I have nothing to verify the accuracy of its capacitance or inductance. That is why I am very excited that you are getting one.  I am sure you are not going to learn anything about LCR from me, but this may be of interest from another post.

DE-5000 LCR meter on ESR measurements. I was initially disappointed at the low ESR resolution on large value caps but then I wondered if the series resistance mode gives the same readings as ESR in capacitance mode.

To access ESR, D, Q , and theta you have to be in manual series capacitance mode (not auto LCR mode) then you can cycle through each on the secondary display. I can measure a 1000uF cap at 100Hz thru 1kHz but at 10kHz and 100kHz it gives overload which it should. In auto LCR mode it actually shows the inductance of the cap at 100kHz.

The max ESR resolution at 1kHz is 0.01 Ohm and this 1000uF cap reads 0.04 Ohm.  If I switch to reading series resistance it reads .047 Ohm (1mOhm resolution) still at 1kHz. Now in series resistance mode I can switch the frequency to 10kHz and it reads 0.045 Ohm and switch to 100kHz and it reads 0.032 Ohm.

Now a 6000uF cap (reads 7450uF) at 120Hz gives an ESR of 0.0  and I cant go to 1kHz because it will show overload. Switch to series resistance mode and I get 0.075 Ohm at 1kHz, 0.068 Ohm at 10kHz, and 0.065 Ohm at 100kHz.

So it seems the series resistance mode is an effective high resolution ESR reading and allows all frequencies to be used. I could be misguided here so please comment if this is bogus.

EDIT: fixed video link
mrubbert:
Cheaper then ms5308 was a dead end to me, shit so many hours on that adventure.
I will give Mastech one more chance and never put poweradapter in to it.
Next choice is IET.

Good info robrenz, have to check the video also.
It will be intresting when master PA4TIM compares with your meter.

Always good thing and not to buy from a shitplace like aliexpress.
Just return it if you not like it !
nixxon:
Reply from seller regarding faulty power supply:

Dear "nixxon",

That's good, thanks for your information.also the manufacturer are working at the issue now, we will get back to you when we get the further solution from manufacturer, thank you.

- smtzone
iloveelectronics:
I finally received my first order of MS5308's today. I will be making a post under the Buy and Sell forum soon but before that I'd like to first report what I found with the unit I tested regarding the power adapter issue.

I watched John's video review again, specially the part where he showed the problem with resistance measurement when plugged in with the power adapter. I tried to replicate what he did. So here are my findings:

- At lower reistance, up to about 5k ohms, the power adapter has no effect on the reading at all.
- Starting from near 5k to near 10k, the reading would either jump up or down a little the moment you plug in the adapter, but would soon settle back to the original reading
- From near 10k onwards, the effect becomes more apparent. The reading would not settle to the original value anymore. At 20k ohms, which is what John showed in his video, my unit reads about 19.7k (as oppose to John's 29k or something).
- The drift in the readings becomes more and more significant as the resistance value goes up. At about 470k my unit reads 503k, representing an error of about 7%.

Now, I have no idea if they have partially fixed the problem in this batch sent me, or is it just different behaviours on different units. I will try to contact the manufacturer and see if I can get a response.
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