Tektronix FG 504

M ai n te nan ce- F G 504 (S N Β 040000 & UP)
Out
p ut
U SI N G THE
RE A R IN T ERF
AC
E
CO
NNE CTO R S
T h
is termi
n al is connecte d to t h e front panel O U T PU T
con nector through α 30 kQ resistor . The common terminal
for t h is output is p i n 27 Α ( M ain board only) .
Swee p R eset Output
Α positive-goi ng pulsefrom a b out-13 V toabout+9 V
occurs at th is conn ection at t he time t
h
e swee p
resets .
T h is output is d esig ned to drive
at least 10 k Ω . T he p ulse
can be use
d
to
raise t he pen on α ch art recor d er w h en
d
oi
n g sweep f r e qu ency tests on filters or ot h er d evices or
as e n d-of-swee p trigger for an exter n al device . Co nn ect
t he ot h er lea d to c h assis grou n d .,
L inear Sweep Output
T h is te r mi n al is connecte d to t he output of
t he swee p
gen erator t h ro u g h α 1 k
Ω resistor . U se c h assis ground as
t
h
e
retur n circuit . T h e waveform at t h is terminal is
i de n tical with t h ewaveform at t h e front p anel
L I NS WEEP
O U T PU Tte r minal except i nt
h
e STO
P FRE
Q mo
de . Int he
STO P FRE Q mode t h is rear connectio
n continues to
outpu t t he linear
sweep ram p w h ile t he fro n t panel
connectio n outputs α do voltage e q uivalent to t he pea k
ramp voltage . To ma k e t he output at t he rear terminal
t h
e
same as t he L I N S WEEP O U T PU T
terminal, remove t he
lower end of R 1525 from t h e Fu n ctio
n
board . Co
nn ect
an
eig h t inc h wire from t
h e lower end of R 1525 to t h e lower
en d of R 1520 also
located
on
t he F unctio n b oard . T h e
exact locatio
n of t h ese resistors can be fou nd from t h e
R
ep
laceable P arts L ocatio n Gri d .
AM
In p ut
T h is inpu t h as t he same in p ut c
h
aracteristics
asthe ΑΜ
I NPU T co nn ection on
t h efront panel . U sec h assis grou nd
for t he
circuit retur n .
5- 8
(See
F igure 5-2 .)
Swee p Trigger In p ut
T h is termi n al is connecte d to t h e front pan el S
WP TR IG
I NPU T conn ector t h ro u g h α 1 .5
k Ω resistor . Use c h assis
grou nd for t he retur n
circuit .
Trigge r Out put
T h is connectio n is madet h roug h α 510 Ω resistortot
he
fro n t p a n el TR IG O U T PU T conn ector . U
se connectio n
27 Β for t he retu r n circuit .
Ph ase L oc k E rror V oltage
T he signal at t h is termi
n al is t he output of t h e ph ase
loc k ed loop
filter . An output of 0 V i n dicatest he
r efere nce
fre q uency is t he same ast he free-ru n freque
ncy . Α voltage
of +10 V (o p en circuit) indicates
α ge n erator output
freque n cy of abo u t 10 dial
d ivisio ns h ig h er t han free-run
fre quency,
an d -10 V (o pen circuit) i n dicates
agenerator
fre q ue n cy about 10 d ial divisions lower
t han t he free- r un
fre q ue n cy . T h e outp ut impe
dance is 1 ΚΩ . U se t he ch assis
groun d as t
h
e retu
r n circuit .
Trigger I n put
T h is co nn ection h as t h e same d o i nput ch aracteristics
as t he fro n t p anel TR IGG ER I NPU T connector . U se t h e
ch assis as t he return circuit .
V C F In p ut
T h is co nn ectio n has t he same i
nput ch aracteristics as
t he fro n t pan el V C F I NPU T co nnector .
U se co n tact 22 Β αs
t h e retur n circuit
.
REV ΑA PR 1980