Tesla BM 510, Instruction Manual

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Usmerńovace
Usmgrngni v napśjecim zdroji je provedeno
vykonovymi usmgrńovaci. Tyto diody jsou snad­
no pfistupne a vymgnitelne, protoźe jsou vpa-
jeny do kerainickych mustku. Za usmgrńovaci
nasleduji dvojite RC filtry s omezovacimi od­
pory proti proudov^m spiekam.
Zdrój vysokelio napeti
Jedno sekundami vinuti transformatora asi
415 V slouźi jako zdrój pro nśsobice vysokeho
napgti. Jeden pgtinasobic skytś zdporn^ zdrój
anodoveho napgti —1250 V a jeden ztrojovag
potom kladne napgti + 1 3 0 0 v pro urychlovaci
anodu obrazovky. Ndsobifie tvofi tuzkove selś-
nove usmgrilovace s krabicovymi kondenzatory
0,25 juF v tgsnśm provedeni. Zaporny zdrój je
stabilizovan varistorem.
VI. 0 D R Ż B A
UDRŻBA VERTIKALNIHO ZESILOVACE
Kontrola kalibrace citlivosti
Ovlśdaci prvky nastavime takto:
Pfepinac S202 do polohy 20mV/dil; S201 do
p o lo h y --------a S203 do polohy „0“. Potencio-
metr zmgny citlivosti R248 dame do polohy
„KAL. Y“.
Zapneme pristroj a dostavime ostatnimi prvky
obróżek na stinitku tak, aby byl dostatecng
jasn^ a ostry. Nastavime potenciometrem R263
velikost obrózku na stinitku tak, aby odpovi-
dala velikost 60 mV vy§ce 3 dilku.
Nastaveni frekvencni kompenzace zesilovace
Na vstup Y1 (F201) pfipojte napgti z generś-
toru obdelnikoveho napgti 10 kHz. Vstupni dg-
lić S202 pfepneme do polohy 20mV/dil; po-
tenciometr zmgny citlivosti R248 do polohy
„KAL. Y“; pfepinac S203 do polohy „0“. Nasta­
vime stopu pfibliżng do stfedu stinitka; obdel-
nik asi 3 dilky vysoky. Pfiddvanim kondenza-
toru Cc paralelng k C241 nastavime optimślni
prub§h obdelniku. (Cc = 220 nebo 390 nebo
680 pF.J
Nastaveni vstupni kapacity zakladniho rozsahu
vstupu Y1
Pfepinac S202 nastavime do polohy 20mV/dil;
S201 do polohy „—
“. N a vstup Y1 (F201) pfi-
pojime generator obdelnikoveho napgti asi 150
mV pfes kalibragni jednotku. Na stinitku se
objevi obdelnikove prńbghy, jejichź optimalni
tvar dostavime kondenzatorem C233. Pfi nasta-
vovdni je nutno mit pfepinac S203 v poloze „0“.
Rectifiers
The rectification in the power pack is taken
care of by the power rectifiers. These diodes
are easily accessible and replaceable, being
soldered between ceramic supports. The re c ­
tifiers are followed by double RC filters with
resistors to limit current surges.
H T Supply
One of the secondary windings of the trans­
former, about 415 V, serves as a power source
for H T multipliers. A quintupler acst as a
source of the negative plate potential of
— 1250 V, a tripler being provided to supply
a positive voltage of + 1 3 0 0 V for the accele­
rating electrode of the C R tube. The multi­
pliers consist of pencil-type selenium recti­
fiers with 0.25 juF potted capacitors. The ne­
gative supply is stabilized with a varistor.
V I . M A I N T E N A N C E
MAINTENANCE OF VERTICAL AMPLIFIER
Calibration Sensitivity Check
Set the control elements as follows:
Switch S202 to the position 20 mV/div.; switch
S201 to the position
“rzr^„
and switch S203
to the position “0 “; sensitivity adjustment
potentiometer R248 to the position “Y CAL.“.
Close the mains switch and use the other con­
trol elements to adjust a sufficiently bright
and sharp image on the screen. Using the po­
tentiometer R263, set the size of the image to
make the voltage of 60 mV correspond to 3
vertical divisions.
Frequency Compensation Adjustment
Apply a rectangular-wave voltage with a fre­
quency of 10 kHz obtained from a generator
to the Y1 input (F201J. Set the input divider
switch S202 to the position 20 mV/div., the
sensitivity adjustment potentiometer R248 to
the position “Y CAL.“ and the switch S203 to
the position “0 “. Set tl\e trace approximately
to the centre of the screen, the height of the
rectangle being about 3 divisions. Trim the
wave-form of the rectangle to an optimum by
adding Cc capacitor in parallel with C241
(Cc — 220 or 390 or 680 pF).
Adjustment of Input Capacity of the Basic
Range of Y1 Input
Set the switch S202 to the position 20 mV/div.
and the switch S201 to the position
“zrrzi“.
Ap­
ply a rectangular-wave voltage of about 150 mV
from a generator to the Y1 input (F201) via a
calibrator. Rectangular waves appear on the
screen and their shape can be adjusted to the
optimum by means of the capacitor C233. The
switch S203 must be in its “0 “ position during
the adjustment.
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