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Mastech MS5308 LCR meter with ESR measurement - on discount at the moment
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onlooker:
If 1 to 5 MHz is to be the test frequency, it is way beyond the current topic of Mastech MS5308 LCR meter with or without taking into account of applying bias.  On the other hand, measuring LCR using any LCR meter with bias is just a easy "DIY" project, especially if the accuracy is not the concern (e.g. the sever non-linearity in the examples) right?
free_electron:

--- Quote from: onlooker on April 04, 2012, 01:59:30 am ---If 1 to 5 MHz is to be the test frequency, it is way beyond the current topic of Mastech MS5308 LCR meter with or without taking into account of applying bias.  On the other hand, measuring LCR using any LCR meter with bias is just a easy "DIY" project, especially if the accuracy is not the concern (e.g. the sever non-linearity in the examples) right?

--- End quote ---

yes and no.. i'd like to be able to make some plots of how capacitors behave , so i'd like to be able to sweep the bias voltage for example... I don't know how this LCR meter is going to react if i start applying external voltage on the capacitor... most LCR's want to 'discharge' before measuring. Can't do that in my case. I want  to put 50 volts on that cap.. and measure its capacitance ...

I know the big bridges like the wayne-kerr's can do it. When i visit my parts suppliers ( TDK murata etc ) thay all have these big bridge. but hey are 50K$ and more (and they can alsoe do leakage, soakage, impulsa , sel sr and uch more .. i was just wondering if there is something a bit more 'hobby' that has biasing capability. ( let's say below 1K $ ... ) I habven't found one yet ( apart from my second hand HP LCR bridge 4263B that has a bias generator up to 1.5 volts.
onlooker:
The discharge clause is meant to not apply (excessive) external voltage to the meter leads. If the DUT cap under bias is not too large, one can serial a "larger" and low ESR cap to the LCR to measure it. This is how I measure battery ESRs with my TH2822A (a 4 uF with esr=60m Ohms). On a side note, I think TH2822A is a better choice: On paper, it has better C and R accuracy/range, a little lesser H accuracy/range and it has 40000 counts (vs 20000) and better looking and not as bulky, though it does not do 100kHz. I think they are about same in price.
T4P:
https://www.eevblog.com/forum/product-reviews-photos-and-discussion/tonghui-th2822-lcr-meter-review-teardown-and-possible-hacking/
Looks like it costs 230$ and it only does 10kHz and does not have a backlight .
Hmm .  :)
But really , do you need that extra counts in a LCR meter , i don't know .
If it was a normal DMM , ok .
zoltm:

--- Quote from: onlooker on April 04, 2012, 01:21:36 pm ---......  though it does not do 100kHz.

--- End quote ---

The TH2822C would do 100kHz.
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