EEVblog Electronics Community Forum
Products => Test Equipment => Topic started by: Pedram on September 01, 2014, 05:55:17 pm
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Hi,
here is my Victor 88C DMM teardown.
Specs: http://www.china-victor.com/english/en/product_data.aspx?ClassID=168&ID=303 (http://www.china-victor.com/english/en/product_data.aspx?ClassID=168&ID=303)
the price on Ebay and Aliexpress is about $50, but as far as i know the actual price is about $35.
Ebay (http://www.ebay.com/sch/i.html?_from=R40&_trksid=p2050601.m570.l1313.TR0.TRC0.H0.Xvictor+88c&_nkw=victor+88c&_sacat=0)
AliExpress (http://www.aliexpress.com/w/wholesale-victor-vc88c.html?site=glo&SearchText=victor+vc88c&SortType=total_tranpro_desc&groupsort=1&initiative_id=SB_20140901090520&shipCountry=ir&filterCat=15370306)
if you dig enough. you can find as cheap as $35 :)
note that this unit is used for 2 years and it's not new.
unfortunately i don't have any more accurate source to check the accuracy.
here is the DMM:
(http://i.imgur.com/LkwowP0l.jpg)
excuse my messy desk :-[ :-//
(http://i.imgur.com/irK0ZMZl.jpg)
back:
(http://i.imgur.com/NO7TpUOl.jpg)
it has Inductance,Capacitance,Resistance,Voltage,Ampere,Temperature and Frequency meter. also the useless hfe...
(http://i.imgur.com/tX0C99zl.jpg)
3.5 digit display with backlight on:
(http://i.imgur.com/fPU8l8Sl.jpg)
it uses a single 9V battery:
it's possible to replace the battery with removing single screw.
(http://i.imgur.com/Q0FaJ23l.jpg)
4 self tapper screws and ... we are in
back cover is shielded
(http://i.imgur.com/BJNsyS9l.jpg)
dual U channel slot
(http://i.imgur.com/U1HTgodl.jpg)
Hand soldered ?
(http://i.imgur.com/Q8BYg9ll.jpg)
undo 4 screws around the LCD and lift the board ...
(http://i.imgur.com/HLLUO05l.jpg)
two board construction
(http://i.imgur.com/4NrnNOcl.jpg)
20A ceramic fuse for Amp range and a 400ma Poly Fuse for mA range.
(http://i.imgur.com/DQl1Mh8l.jpg)
single piece input jack
(http://i.imgur.com/GaSULIgl.jpg)
Input protection circuit
(http://i.imgur.com/hgUwVtZl.jpg)
squeezed transistor :-- :-- |O
(http://i.imgur.com/R5lrEj0l.jpg)
6 calibration pot.... meh...
(http://i.imgur.com/zc12tsTl.jpg)
LM358 (http://www.st.com/web/en/resource/technical/document/datasheet/CD00000464.pdf) TL072C (http://www.st.com/web/en/resource/technical/document/datasheet/CD00000490.pdf) HEF4066BT (http://www.nxp.com/documents/data_sheet/74HC_HCT4066.pdf)
(http://i.imgur.com/CZJlgSYl.jpg)
HEF4093BT (http://www.nxp.com/documents/data_sheet/HEF4093B.pdf) TL062C (http://www.st.com/web/en/resource/technical/document/datasheet/CD00000486.pdf)
(http://i.imgur.com/5hq4Lt2l.jpg)
Nothing interesting under second PCB
(http://i.imgur.com/fs5JBjhl.jpg)
except.... another squeezed transistor.. :scared:
(http://i.imgur.com/IKPSj0Jl.jpg)
LCD is connected to the board with 4 screws and a zebra strip. LCD backlight is directly soldered. but it's possible to flip it gently . ..... 3 more trim pot..... :phew:
and of course .... chip on board...(AME7106 (http://pdf.datasheetcatalog.com/datasheet/ame/ame7106.pdf) ?)
TL062C (http://www.st.com/web/en/resource/technical/document/datasheet/CD00000486.pdf) *2 and 74HC14D (http://www.nxp.com/documents/data_sheet/74HC_HCT14.pdf)
(http://i.imgur.com/IVMjCSTl.jpg)
more resolution: http://imgur.com/a/ZmATo (http://imgur.com/a/ZmATo)
end.
(sorry for my english :palm:)
it's not a bad meter for the price... especially inductance meter come in handy sometimes.
hope you enjoyed it :-+
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Thanks for the pictures. The switches seem unusual for a multimeter, unusually expensive. Are they all momentary?
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Thanks for the pictures. The switches seem unusual for a multimeter, unusually expensive. Are they all momentary?
backlight and peak hold are momentary
power and AC/DC are toggle switches.
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Thanks for the teardown, those poor bunched up transistors.
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Thanks for the teardown. Interesting combination of through hole and SMD. I'm surprised to see input protection.
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What is this yellow thing ? spark gap ? gas discharge tube ? or simply a cap ?
(marked as C2* on top right)
(http://i.imgur.com/zc12tsTl.jpg)
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that is interesting, as the smd C2 is missing.
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What is this yellow thing ? spark gap ? gas discharge tube ? or simply a cap ?
(marked as C2* on top right)
(http://i.imgur.com/zc12tsTl.jpg)
It's a polyester film capacitor. Looks different because it doesn't have an opaque dip like most of the ones you'll see do.
(https://i.imgur.com/KqoWKPs.jpg)
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meh......i thought it's something interesting :=\ :=\
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the price on Ebay and Aliexpress is about $50, but as far as i know the actual price is about $35.
Ebay (http://www.ebay.com/sch/i.html?_from=R40&_trksid=p2050601.m570.l1313.TR0.TRC0.H0.Xvictor+88c&_nkw=victor+88c&_sacat=0)
AliExpress (http://www.aliexpress.com/w/wholesale-victor-vc88c.html?site=glo&SearchText=victor+vc88c&SortType=total_tranpro_desc&groupsort=1&initiative_id=SB_20140901090520&shipCountry=ir&filterCat=15370306)
if you dig enough. you can find as cheap as $35 :)
Thank you very much for sharing the tear down photos :). By the way, the current price (http://alimahjoob68.mihanblog.com/post/11) at Tehran's Amjad Electronics Bazaar is IRR 900k (less than $30).
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the price on Ebay and Aliexpress is about $50, but as far as i know the actual price is about $35.
Ebay (http://www.ebay.com/sch/i.html?_from=R40&_trksid=p2050601.m570.l1313.TR0.TRC0.H0.Xvictor+88c&_nkw=victor+88c&_sacat=0)
AliExpress (http://www.aliexpress.com/w/wholesale-victor-vc88c.html?site=glo&SearchText=victor+vc88c&SortType=total_tranpro_desc&groupsort=1&initiative_id=SB_20140901090520&shipCountry=ir&filterCat=15370306)
if you dig enough. you can find as cheap as $35 :)
Thank you very much for sharing the tear down photos :). By the way, the current price (http://alimahjoob68.mihanblog.com/post/11) at Tehran's Amjad Electronics Bazaar is IRR 900k (less than $30).
as far as i'm aware electronic equipments are imported with government's dollars (what is the correct english word for 'Arze Dolati'?! ) which is ~ IRR 26k per one USD. so IRR900k/26 = ~35USD... maybe i'm wrong. i bought my unit 2-3 years ago. :)
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as far as i'm aware electronic equipments are imported with government's dollars (what is the correct english word for 'Arze Dolati'?! ) which is ~ IRR 26k per one USD. so IRR900k/26 = ~35USD... maybe i'm wrong. i bought my unit 2-3 years ago. :)
Based on a previous personal experiment, I am almost sure that subsidized governmental exchange is not allocated for Electronics Testing and Measurement equipment. In addition to that, the current Customs Tariff (http://www.irica.gov.ir/Portal/Home/Default.aspx?CategoryID=82cebca0-58cc-4be6-bef5-a94e2242140a) for digital multi-meters (HS-Code 90303100) is 15%. If we add shipment costs, importer margin and retail sales margin to that, the price should be much higher.
Maybe the whole batch of this multimeter was imported before 2012 currency downfall (Iranian year 1390) during the time that each US$ value was around IRR 12k :-//.
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Hello.
I have a problem and I hope you can help me to solve it. I have the same instrument and it got wet |O, as I opened it to dry it I accidentally messed the contacts up. Could you please send me pictures of the contacts configuration like on this pic (http://i.imgur.com/fs5JBjhl.jpg (http://i.imgur.com/fs5JBjhl.jpg)), but from bellow.
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Hello.
I have a problem and I hope you can help me to solve it. I have the same instrument and it got wet |O, as I opened it to dry it I accidentally messed the contacts up. Could you please send me pictures of the contacts configuration like on this pic (http://i.imgur.com/fs5JBjhl.jpg (http://i.imgur.com/fs5JBjhl.jpg)), but from bellow.
Check this:
http://monitor.espec.ws/section30/topic132428.html (http://monitor.espec.ws/section30/topic132428.html)
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Friends, prompt please the big resistor nominal which is outlined red on a photo and what fuse is set near it?
at me these details blew up. :scared: