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Vichy VC99 Multimeter Review and Teardown

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Simon:
so you used one potentially inaccurate machine to calibrate another - the blind leading the blind....... You need a voltage source that is known to be at least one order of magnitude better than the meter, so if you can read down to 10mV you need a voltage source accurate to 1mV

Salas:
I have ordered AD581LH for rechecking. Correction, 3 blind mice it is, UT61E agrees well too. :)

Rick:

--- Quote from: T4P on October 30, 2012, 10:09:02 am ---TrueRMS converters have a fair bit of noise that's for sure and if you say the last digit on 50k mode is insignificant, well, doesn't the fluke 289/289 have almost the same specs?

--- End quote ---
So if we want real 5-6 digits accuracy we need to buy an accurate bench multimeter, is this the conclusion?

T-23lol:
Hello, I have a little problem with my Vichy VC99. I have damaged my temperature measurement part of multimeter by high AC current.  I have been measuring temp while my probes for voltage measure was conected to the multimeter and circuit with 230V. I know ... i have been stupid.  |O Now It displays only OL .

I have changed transistors Q1 and Q2 whitch was exploded but i have also damaged rsistor R39. This resistor is absolutely cooked and I don't know value of this one. Please can somebody help me and tell me value of resistor R39 ?

Thank you very much for your help and sorry for my bad english.

Bored@Work:
I think this is the IC used in the meter http://www.ic-fortune.com/upload/Download/FS9922-DMM4-DS-11_EN.pdf Maybe you can find the equivalent of R39 in the datasheet, and maybe Fortune recommends a particular value in the datasheet or provides information how a designer should derive a value.

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