Products > Test Equipment
Mastech MS5308 LCR meter with ESR measurement - on discount at the moment
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grenert:
The IET is actually not made by them.  It is made in Taiwan by a company called DER-EE.  It appears to be a standard Cirrus chipset design generally (the IET manual is basically the chipset manual), but done without shortcuts (e. g., penny-pinching on the power supply, oversized case to use up some surplus cases).  As PA4TIM says, they have a reputation to keep up, and they apparently confirmed the performance of that LCR meter.  I'm very happy with mine, but I have to admit I have nothing better to compare with.  I completely agree that buying from top names (new or used) is a way to get a well-designed product without headaches.  It may be overpriced for what it is, it may have less features, but you will never think, "I HATE this thing!  This design is ridiculous!  Didn't they try using this thing before deciding to sell it???"  Packing a power supply that causes the meter to malfunction is unacceptable at any price, in my opinion, and clearly some shortcut must have been taken on the power input that the meter doesn't even recognize that the power supply is malfunctioning and continues to pretend everything is fine.
mrubbert:
If you whant to mod this ?
Then start with input power switching: Inrush current, transients, noise, softswitching between battery and adapter.... + everything else i have no clue about.

Here is something Linear using in cellphones and laptops: http://cds.linear.com/docs/Datasheet/4411fa.pdf

How fun is it to pay 200 and start with that, looks like multilayer PCB, not dubble.
More fun if you manage to read eprom and figure out how the calibrate it, maybe copy IET and paste in 5308.

Its possible that EL-cheapo cyrustek meters have a contract that Dosent allow them to have better spec. Buisness is buisness and someone have paid alot for development !
kripton2035:
cyrustek has orders not to sell their chip to non (lcr)-instruments-making companies...
mrubbert:
...... John,  wish to mod-modificate it or upgrade, Not build new one.

Thanks, its good to know that you cant buy new chipset if you blow them up.
kripton2035:
if you want to have a good lcr meter and have full access to chips and source code, just build this one :
http://kripton2035.free.fr/LCR%20meters/lcr-go-russian.html
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