few days ago i got this and made few videos and pics:
http://www.youtube.com/watch?v=CRAbAbFBXXE
http://www.youtube.com/watch?v=t5Yrr_xrtvY
http://www.youtube.com/watch?v=0C10xzUdbTk
and better versions of last 2(ffdshow to watch)
http://www.mediafire.com/file/yztmj2mztnh/fb_.avi
http://www.mediafire.com/file/mcgmimonugm/fb_2.avi
few pics attached.
i'll also upload pdf by bob parker(original creater of this device) and anatek pdf of simillar device.
mike's page
http://www.radiofan.ru/fbtest/fbtest.htm
pdf
https://cdn.badcaps-static.com/pdfs/...78389b3cda.pdf
translation of pdf
and a quick rundown of how it's operated/what it does:
you turn it on by shorting probes...first thing it shows is battery voltage
("Luminous 4th red LED corresponds to 2.6, 1 st green - 2.7V, 2-nd Green - 2.8V, 3rd green - 2.9V and 4 th green - 3B. By reducing the supply voltage below 2.7V recommended to replace the battery")
then it does "runing-light" and then first led lights to mark device is ready.
then you connect it to winding you wanna test and see what led(s) is lit.
this devices applies pulse to the winding and then measures how much it "rings". more rings=better. number of rings=number of lit leds in case of bob parker design, and here there are only 4 leds but each can do red and green, so we again arrive at 8 possible states.
as you can see above in the video this also works for trafos in smps psus, and even the feedback winding of +5vstby trafo produces some ringing(although only one ring).
it seems this can be used for some coils too, but good coil won't necessarily lit green leds, because it's ringing may be too small because it has too small "q factor". so testing known good against suspected coil should help in such cases. for some coils it probably won't work at all. ie it'll show short-circuit state.
overall a pretty nice device to help those "vintage" crt devices when flyback trafo is suspicious...and also trafos in smps psus
http://www.youtube.com/watch?v=CRAbAbFBXXE
http://www.youtube.com/watch?v=t5Yrr_xrtvY
http://www.youtube.com/watch?v=0C10xzUdbTk
and better versions of last 2(ffdshow to watch)
http://www.mediafire.com/file/yztmj2mztnh/fb_.avi
http://www.mediafire.com/file/mcgmimonugm/fb_2.avi
few pics attached.
i'll also upload pdf by bob parker(original creater of this device) and anatek pdf of simillar device.
mike's page
http://www.radiofan.ru/fbtest/fbtest.htm
https://cdn.badcaps-static.com/pdfs/...78389b3cda.pdf
translation of pdf
and a quick rundown of how it's operated/what it does:
you turn it on by shorting probes...first thing it shows is battery voltage
("Luminous 4th red LED corresponds to 2.6, 1 st green - 2.7V, 2-nd Green - 2.8V, 3rd green - 2.9V and 4 th green - 3B. By reducing the supply voltage below 2.7V recommended to replace the battery")
then it does "runing-light" and then first led lights to mark device is ready.
then you connect it to winding you wanna test and see what led(s) is lit.
this devices applies pulse to the winding and then measures how much it "rings". more rings=better. number of rings=number of lit leds in case of bob parker design, and here there are only 4 leds but each can do red and green, so we again arrive at 8 possible states.
as you can see above in the video this also works for trafos in smps psus, and even the feedback winding of +5vstby trafo produces some ringing(although only one ring).
it seems this can be used for some coils too, but good coil won't necessarily lit green leds, because it's ringing may be too small because it has too small "q factor". so testing known good against suspected coil should help in such cases. for some coils it probably won't work at all. ie it'll show short-circuit state.
overall a pretty nice device to help those "vintage" crt devices when flyback trafo is suspicious...and also trafos in smps psus
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