Products > Test Equipment
Mastech MS5308 LCR meter with ESR measurement - on discount at the moment
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robrenz:
Accuracy specs on that are pretty poor for the money.
jwrtiger:
Hi all,  Update on the Mastech LCR Tester problem with the resistance values changing when using the external supply.  I have not done a complete test yet buy I patched in my linear bench power supply and the reading from internal battery to external power source had no change at all.   So it looks like it is my Mastech's LCR external switching power supply.   I am going to see if I can figure out what the actual problem was with the supply.  I thought I could lift the bottom label and undo some screws but there are no screws so I guess it is glued together.  Doesn't seem to have any clips/ears.  I don't plan to contact the seller because I have the parts on hand to make a power supply at basically no cost and I will fuse it and it will be linear instead of switching.  I hope in the future others can report and let me know if they had a problem with the external power supply.

T4P:

--- Quote from: FrankenPC on December 04, 2012, 09:26:12 pm ---Hi, noob here looking for a LCR/ESR meter.  Question is, why would you opt for the Mastech when you could spend a few bucks more and get the smart tweezers?  Is it because of the large screen readability?  Or is it the higher frequency range? 

--- End quote ---
Like why would you buy a smart tweezer? The mastech is properly, properly 100$ less than that and is a PROPER, PROPER LCR meter with Dissipation factor measurement and Series/Parallel mode does the tweezer have that?
You have Q (damping) factor, and phase factor
Does it have RS232 either?
Well really asking these sort of questions get these sort of answers, a proper LCR meter doesn't just measure caps inductors and resistors + ESR they measure a whole variety of factors too and ... trust me the higher frequency is useful for low value caps as it increases your accuracy unlike say at 10KHz
KD0CAC John:
POWER SUPPLY vs. BATTERY
I finally picked up a large package of batteries , in order to do the test .
I powered up the meter , then went through the calibration procedure , then found a NOS 3 watt 100 ohm carbon resistor that was waiting to get put away .
It measured about 109.?? [ this was yesterday and did not write down the last digits ] and with the meter plugged in to the power supply , with batteries installed , I pulled the plug from the PS at the meter and no change to the reading , even at the the lowest number .??? , plugged back in PS and again no change .
Again thanks for the video . 
SeanB:
Most likely the switching supply puts wideband noise into the supply rails, and this adds noise to the measurement, thus the errors.
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