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FLUKE 1912A FREQUENCY COUNTER

METER - SERVICE MANUAL
Type: (PDF)
Size
4.8 MB
Page
130
Category
METER
SERVICE MANUAL
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  • Also known:
    FLUKE FREQUENCY COUNTER 1912A 1912
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  • See related repair forum topics below. May be help you to repair.
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Relevant METER forum topics:
Fluke ScopeMeter 105B Series II Display frozen / no Display
In my case the display of the ScopeMeter was frozen and the keyboard did not respond any more exept the on/off key. This happened always after the ScopeMeter has been switched on for a while. To find the temperature effect, I heated up the different parts of the Digital A1 board with a hair dryer. At some point, the device display stopped working completely and only the backlight was working. This effect was steady and irreversible.
To repair the device, you need the "fluke_92b_96b_99b_105b_servicemanual" provided here in the service manual area.
On page 272 in Figure 9.2b (Digital A1 circuit diagram, part b) the display contrast circuit schematic shows the NPN Transistor V1432 of type BC848C (see also the attached picture). Measuring the Base/Emitter diode showed a low resistance of 100 Ohms in both directions. Replacing that transistor by a NPN transistor of type BC847C solved the problem and the device was working correctly again.
The reason for choosing the BC847C instead of the BC848C are the Vcbo and Vceo of only 30 V of the BC848x series. The BC847x series has a Vcbo of 50 V and a Vceo of 45 V respectively and offers therefore a greater margin. The V1432 is placed between TP431 (LCDPWR, +5 V) and the -30 V connection from Analog Board A2. These conditions are too close to the absolute maximum ratings of the BC848x and are especially for higher temperatures critical.
Fluke 8050A DMM Kijelző hiba
Üdv!   Átnézve a netet, nem igazán találtam egyszerű megoldást a javítására.  Kissé összefolyt a kijelzője, több ponton, óvatosan megnyomkodva most lehúzódott a folt az aljába egy sávba. Tulajdonképen most használható lett, ha középen megnyomom akkor a folt eltűnik és tökéletesnek tűnik, de vissza mászik egy sávba .  Van erre valami megoldás, vagy kuka ?
FLUKE PM3384b 100MHz 2-4 bemenetek digitális üzemmódban nem működnek
Sziasztok! A tárgyban nevezett szkóp 2-4 bemenetei nem működnek digitális üzemmódban. A sugár valahol "lent van", épp csak látni lehet az árnyékát. A szkópban lévő digitalizáló kártyán a csatornák 1-3 ,2-4 bemenetenként vannak összefogva. Mérések után úgy néz ki, hogy a jel bemegy a OQ0233 számú (egyedi Philips gyártmány) IC-be, de onnan már nem jön ki tisztes alakban. Ha esetleg valakinek volna ilyen kártyája megmaradva, azt szívesen fogadnám! Köszi a segítséget. Üdv, KN
Fluke type 174 meter, parts info needed
Hello, can you help us with the ic number, the Fluke 174 type meter

ic
ltpz
ad737
a01b
https://drive.google.com/file/d/1rsSm5hB9u2rA_xxwNXQoOH9_hn7sX72Y/view?usp=drivesdk
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