Форум
Технические вопросы => ESR-micro v 4.0 (снят с производства) => Тема начата: alexmarines от 31 Май 2012, 15:23:21
-
hi,
i need of help!!
i measured the capacitance of a capacitor 470uf 25V before to discharge it!!
now if i try to do the calibration,it doesn't do it!
if i try to read the capacitance,it's incorrect and it doesn't display the esr!
please help me!!
-
i tried to read R1 in circuit and it's read about 0.24 kohm.
i have to read it offline of circuit?
it should be 1ohm?
other components that i have to test?
-
i tried to read R1 in circuit and it's read about 0.24 kohm.
i have to read it offline of circuit?
it should be 1ohm?
other components that i have to test?
ABSOLUTELY!
R1 must be equal 1ohms
need to be replaced!
-
thx,
do you say to change only R1 or i have to check other components?
which are the diodes for the protections?
thx
-
now it's strange!
i put solder always on the same R1 and now i read 164 ohm!!
why?
-
now it's strange!
i put solder always on the same R1 and now i read 164 ohm!!
why?
first replace R1 with resistor 1 ohms, no need to short it
-
ok..i will change it..
which type is this resistance?
1ohm how many watt?
only this R1 or do you think i have to check other components?
-
wattage any you want :)
first change then will see
-
ok thx!
tomorrow i will change it!
i hope to solve!! :-(
-
i didn't find the smd resistance of 1 ohm!
can i do a bridge of solder without use the resistance or i will have problems?
-
i done a bridge of solder witohout use the resistance of 1 ohm and now the esr meter works again !!!!! i can do the calibration
only a question..
if i connect the probes on the left side i read 1.05 9.2 and 104 ohm.
befor of the problem the measure were precise.
how i can correct it?
-
if i try to read also the capacitance of a capacitor of 3.3uf i read with esr 3.89uf and with my multimeter 3.69uf!
before i had the problem they had the same measure!
now i don't know if the esr is also correct!
can i adjust the precision of the capacitance, esr and the resistance?
-
need to set 1 ohm!
as programm calculates all values using 1 ohm value! in your case it will use "0 ohms" instead
you can use any resistor, not only smd
-
then..it's important to use a resistance of 1 ohm.
i put also a smd resistance of 1 ohm and it was with all the tollerance 1.20ohm and i had the same incorrect value of capacitance.
is it normal because the resistance is not precise and i have incorrect measure?
i regulated also the two regulators on the circuit..i did mistakes now??
-
can you tell me the tollerance for the resistance?
because that i have put is a smd resistance of 1 ohm but if i read the value with multimeter i read about 1.20 ohm.
thx
-
better to use 1% tolerance
but common 5% also may be used.
if you set 1 ohm then insert known capacitance capacitor into socket and tune left pot to reach reading you need
-
ok thx a lot!
sorry for my poor english..in your last post you tell me to put a resistence of 1 ohm with max 5%of tollerance and after i have to put a capacitor in the right socket of esr meter and then tune the left potenziometer until i read the correct value of the capacitance..is it correct?
left potenziometer is R9?
and the right potenziometer R15 what's his use?
-
i am trying to explain "step-by-step" ;)
R9 tunes capacitance measurement precision
after you tuned it OK next step is tuning R15 (ESR-R precision).
Insert 10 ohms resistor into socket and tune R15 so that 10.0 will show.
Then do calibrate and check for precision for "low-ohms" resistors i.e. 0.22, 0.33.... 1 ohms
If it needs you can tune R15 to provide maximal precision in range 0....1 ohms. Calibration needs to be done after every tuning of R15!
-
perfect!!
now i have understood! lol
then i need of a resistence of 10 ohm to put into left soket where there is wrote "10 ohm" and after i tune the R15 until i read 10 ohm.
do you think i have to tune also with a resistance of 100 ohm in the left soket where i read "100 ohm"?
then i need also of a resistance of 0.22 0.33 etc etc.. and 1 ohm to put always in the left soket where i read "1 ohm" and after tune by R15.
is it correct?
thx for your great support!
-
YOU NEED TO INSERT RESISTOR INTO RIGHT SIDE OF SOCKET (INSTEAD OF CAPS) NOT LEFT!
:) no need to find exactly 10 ohms, it may be 15 or 8.2 ohms, you need just tune R15 and provide that device shows nominal value of this resistor. The main thing is to provide maximal precision in range 0...1 ohms, you don't need precise measurements within high-ohms range so doesn't matter 100 or 105 or 95 ohms you get while measure test resistor 100 ohms.
-
ok thx :-)
then i need of some low resistors for example 0.22 ohm 0.33ohm 0.50 ohm and 1 ohm.
tomorrow i will buy it! if i will find it!! lol ;-)
but if i try to do the calibration with the lead in the left soket where i read "1 ohm" and i read on display 1 ohm, i don't need to tune R15!
is it correct or not?
-
but if i try to do the calibration with the lead in the left soket where i read "1 ohm" and i read on display 1 ohm, i don't need to tune R15!
is it correct or not?
yes. if you will do calibration with probes you should see 1.00 at socket test resistor
+/-2% is normal dissipation (0.98...1.02)
-
YOU NEED TO INSERT RESISTOR INTO RIGHT SIDE OF SOCKET (INSTEAD OF CAPS) NOT LEFT!
now i read!
i have to do the calibration with the resistor on the right side of the soket to tune capacitance and esr and not in the left side of the soket.
is it correct?
then the left side of the soket..what's his use?
-
yes right. you should connect cap while you tune C and connect resistor into THE SAME holes (at the right side!) while tune R-ESR precision
Left hand side is only for fast device checking just connecting probes and check 1-10-100 ohms.
I dropped manual to your email (as it is bigger than allowed here 256 Kb)
-
thx for the manual. but is it the same i find on the site in pdf?
i have bought a normal resistor of 1 ohm to change the broken resistor and soldered in the esr meter: i read it with multimeter and it's of 1.14 ohm. is it good or not good for precision?
after i did all the tune but i don't have the correct values..i explain you what i have done:
with esr meter switched off:
i put the capacitor of 470uf in the right side soket,i switched on the esr meter and i waited for calibration done and after i tuned the R9 until i read the correct capacitance and after i switched off the esr meter.
after i put another the capacitor of 1000uf in the right side soket,i switched on the esr meter and i waited for calibration done and after i tuned the R9 until i read the correct capacitance and after i switched off the esr meter.
i put again the capacitor i calibrated before of 470uf and the measure now is not correct.
after i tried to tune the esr:
with esr meter switched off:
i put a resistor of 10 ohm in the right side of the soket, i switched on the esr meter and on the display i read 10 ohm.
after i switched off the esr meter and i put a resistor of 0.22 ohm in the right side of the soket, i switched on the esr meter and waited for calibration and i read a wrong value of resistance,then i tune the R15 until i read the correct value.
i switched off the esr meter and i put a resistor of 0.33 ohm,i switched on the esr meter,waited for calibration and i read a wrong value of resistance,then i tune the R15 until i read the correct value (about 0.33).
after i switched off the esr meter i tried to put again the resistor of 0.22ohm,switched on the esr meter,waited for calibration and now the value was again wrong and not 0.22 ohm.
it seems the values not are registered in the esr meter when i go to tune the r9 or r15 for othe measure.
i have to check other components?
-
no. wrong.
you need to tune R15 with 10 ohms resistor first.
AFTER THAT you need to do calibration and check if low-ohms resistors measure properly
Just insert any piece of wire into right side of socket before you turn it on.
Then as you told you turn meter on, see "cal ---", "cal done" and after that you can remove short and check it with low-ohm resistors there on socket.
If you tune R15 again, you need to calibrate unit again one more time.
If you turn it on WITH some cap INSERTED into socket, device also will calibrate, BUT it will "think" that ESR of this cap = 0 so all other readings for other caps will be less by this value (it will be substracted from real ESR)
-
yes it's true! ;D
sorry for my incompetence!! :D
then i have to use a wire to do the jumper on the soket!
then first i tune the capacitance and after the esr,always with the wire! ;D
thx for all!
today i will do the tune!
-
yes, wire is needed only to do calibration, you just must show to device "WHAT IS 0 OHMS?" and it should remember that in its EEPROM ("cal done") ;)
There must be 2 pictures in Russian manual (2 ways for calibration - with probes and wire)
-
ok thx!!
can you tell me where i can find the picture you told me?
i didn't find on the russian manual!
-
did you get device with "paper" manual or not???
it must be together with unit
hehe, took some pictures for you.
you can make similar things just for checking/tuning
-
no i received only the esr micro without the manual at my home!
can you send me this russian manual in email with all these explanation?
-
Manual is sent to your email.
-
thx for the manual!
i sent you the english version ;-)
but i have some problems again!!!!
the capacitance is wrong!!!
i will explain how i tune it!
with esr meter switched off i put a wire in the right soket,switched on and waited for calibration;after i put a capacitor of 470uf and i tuned R9 until i read the correct capacitance.
i pulled out the capacitor and switched off the esr meter.
after i put again the wire in the right soket with esr meter switched off,after i switched on the esr meter and waited for calibration;after i put a capacitor of 1000uf and i tuned R9 until i read the correct capacitance.
i pulled out the capacitor and switched off the esr meter.
after i put again the wire in the right soket with esr meter switched off,after i switched on the esr meter and waited for calibration, i put again the capacitor of 470uf but the read was wrong!!! it strange..it seems that when i put a capacitor and tune R9 and after i put another capacitor and tune again R9 seems i lost the tune i did before for the other capacitor..then the capacitance is never correct!
did you understand?
is it possible the diodes of protection are broken or not or other components for the read of the capacitance?
P.S if i do the calibration with the probes on the left side and after i read with the probes on the left side 1-10-100 ohm, i read 1.25 ohm - 12.5 ohm - 112 ohm !!!
-
please help me! :(
now i am not using the esr meter because it's not affidable! :'(
-
what the capacitance readings are?
for different values
470 - ?
1000 - ?
etc...
-
after when i will come back at home i will tell you the capacitance.
thx always for your excellent support!!
-
here the read of capacitance:
1000uf 16v
with multimeter: 992uf with esr meter (right soket): 1007uf with esr meter (probes): 975uf
470uf 16v
with multimeter: 425uf with esr meter (right soket): 420uf with esr meter (probes): 406uf
330uf 25v
with multimeter: 321uf with esr meter (right soket): 318uf with esr meter (probes): 307uf
220uf 35v
with multimeter: 202 uf with esr meter (right soket) : 198 uf with esr meter (probes): 192uf
3.3uf 450v
with multimeter: 3.61 uf with esr meter (right soket) : 3.83 uf with esr meter (probes): 3.83uf
4.7uf 350v
with multimeter: 4.98 uf with esr meter (right soket) : 5.30 uf with esr meter (probes): 5.28uf
2.2uf 100v
with multimeter: 2.02 uf with esr meter (right soket) : 2.18 uf with esr meter (probes): 2.18uf
i done these measure with right soket and with the probes the measure are different for the high capacitance!
i noted that the calibration of probes are wrong!!
if i put the probes in the left soket after the calibration i read:
1 ohm: 1.15
10 ohm: 11.7
100 ohm: 125
i repeat..until i broken the esr meter the read of capacitance between multimeter and esr meter were similar!
now i see some difference and i don't know if the esr is affidable!
-
can you help me please?
-
Alex sorry for delay with reply, you know there were holidays in Russia...
So. About capacitance measurement all OK I think.
if you calculate in percentage you will get:
992uF 1.5% and -1.7% (socket and probes)
425uF -1.1% and -4.4%
321uF -0.9% and -4.3%
202uF -1.9% and -4.9%
3.61uF -6% and -6%
4.98uF 6.4% and 6%
2.02uF 7.9% and 7.9%
FACTORY tolerance for electrolitical capacitors is about +/-20%
so it doesn't matter exact capacitance value, I bet you have never seen elactrolitical "precision" cap (even with tolerance +/-5%!!!)
Next.
About ESR:
just insert 10ohm resistor into socket and tune R15 and all should be Ok I think. As you told you measure 10ohms and see 11.7... need to be 10.0
-
sorry i didn't know there were holidays in Russia! :-)
ok..i will insert 10ohm resistor into socket and tune R15 ,but before to insert the resistor i have to do always the calibration with a wire or not?
-
first tune R15 using 10 ohms in socket.
After that do calibration and check unit with others resistors (i mean low-ohms 0.22, 0,47 and so...)
Readings should be +/-0.01...0.02ohms from nominal value
-
ok thx!!
then only when i put a 10ohms resistor i don't do the calibration first!
for the others low-ohms resistor i have to do the calibration first.
is it correct?
-
you need to do calibration only one time.
AND after every time you tune pot R15
after you turn device off it saves all constants in its EEPROM
And sure if you use probes, you need to do calibration for probes.
For now just tune 10 ohms and check first
-
sorry but my english is poor because i speak italian! :-)
then...
i do the calibration..after i put the 10ohms resistor and tune R15; after i switch off the device so it saves in eprom.
after i redo the calibration and i do the tune r15 with the others low resistor doing the calibration when i switch off and switch on the device.
Is it correct?
-
No Alex :)
here process step-by-step:
1. first tune R15 with 10 ohms.
2. do calibration with wire on socket
3. Check with low-ohms resistors (on socket)
4. if tolerance less than 0.02ohms for resistors 0.1....1ohm that all Ok
5. if tolerance greater than 0.02 ohm you can insert 1 ohm resistor and tune R15 to get readings 1.00
6. calibrate again and check
-
thx for understood my problem with the english!! lol
ok now it's clear...when i will come back i will do these steps!1
thx for all mike!!!
-
:D my Italian is much wore than your English.
Let us know about result...
-
mike i have done all the steps following you last post but it seems that device doesn't write the value in the eprom...now i explain to you all the steps..
i switched on the device
i put a resistor 10 ohms and the device read 11.7 ohm
i tune r15 until i read 10 ohm and switched off the device
i put a wire in the device and switched on the device for calibration and after i read "cal done".
i put a resistor of 0.49ohm and the device read 0.33ohm then i tune r15 until i read 0.49 ohm.
i switched off the device.
i put a wire in the device and switched on the device for calibration and after i read cal done.
i put a resistor of 0.60ohm and the device read 0.50 ohm then i tune r15 until i read 0.60 ohm.
i switched off the device.
i put a wire in the device and switched on the device for calibration and after i read cal done.
i put a resistor of 0.80ohm and the device read 0.78 ohm then i tune r15 until i read 0.80 ohm.
i switched off the device.
now i do again the calibration with the wire and after i tried to read all the value of the low resistor.
i put again the resistor of 0,49 ohm and i read again 0.33 ohm!!! then the value that i tuned before didn't write in the eprom!
the same for the other resistors!!
it seems it doesn't write in the eprom!
for confirm i put the resistor 10 ohm and the device read 11.7 ohm again!!!
did you understand the problem?
it seems the device doesn't write the value in the eprom because when i tune r15 for other resistor it lost the last tune i did.
i hope you have understood the problem.
sorry again for my english!!
-
Ohhh Alex, it seems I understand problem now...
In this case probably VT2 needs to be replaced (IRLML6402)
Sometimes these transistors are "hard to get" :(
You can try to tune R15 to provide maximal precision in main range (0...1 ohm)
Just DON'T PAY ATTENTION for precision for 10 ohms and more...
The same way as you did "tune-calibr-check"....
-
i am happy you have understood the problem.
can you tell me how to test this component?
so i can assure it is damaged.
is this the correct datasheet: http://www.irf.com/product-info/datasheets/data/irlml6402.pdf ?
is it a transistor?
i found it on italian store!!!! :-)
http://it.rs-online.com/web/p/mosfet/0301322/?searchTerm=IRLML6402&relevancy-data=636F3D3226696E3D4931384E4B6E6F776E41734D504E266C753D6974266D6D3D6D61746368616C6C7061727469616C26706D3D5E5C772B2426706F3D313326736E3D592673743D4D414E5F504152545F4E554D424552267573743D49524C4D4C363430322677633D424F544826
can you confirm it's the component i found?
do you think i need others components?
-
yes. here it is! need to start from it as more likely cause..
-
i have changed the transistor!!!
when i will come back at home i will try to tune the device!
i hope i will solve the problem...
stay tuned ;-)
-
nothing! :-(
always the same problem!!
-
hmm... even don't know what to say...
we can send you assembled pcb. let it cost 40usd including shipping cost
-
hi mike,
but without the lcd display?
only the pcb?
-
hi mike,
but without the lcd display?
only the pcb?
as you want :)
we have fully biult ones (with LCD)
-
for 40usd..what do you send me?
the assembled pcb with lcd and probes?
-
for 40usd..what do you send me?
the assembled pcb with lcd and probes?
with LCD and without probes. just replace your pcb with new one
-
then i have to put only my probes and my covers.
is it correct?
-
ABSOLUTELY!
-
hi mike,
sorry for my delay!!
i need of the pcb with lcd how we wrote in the thread.
How we can proceed to order it?
the price now is lower respect the price ypu told me? :)
i wait for you response.
thx and sorry for my delay but i had some problems in this period.
thx
-
mike but there is a newest version from mine?
or the esr i bought is the last version...
i read in the specs:
ESR (Equivalent Series Resistance) of electrolytic capacitors without removing them from the circuit board
my version is the last produced??
thx
-
hi mike!
did you read my last two posts?
I wait for your response!
thx
-
Mike news???
-
mike but there is a newest version from mine?
or the esr i bought is the last version...
i read in the specs:
ESR (Equivalent Series Resistance) of electrolytic capacitors without removing them from the circuit board
my version is the last produced??
thx
Hi Alex,
now you sorry for delay, missed your message that time.
4.0s is newest of all others. Actually they all are similar just with different LCDs.
Sure we can send pcb to you. There will remain only change pcb and solder probes.
Will discuss by email
-
ok mike!
now i sent you an email at www@radio****ces.ru for the details of the ship and price.
read the email! :D
thx a lot mike!