Tektronix FG 504

Α slot betwee
n p i ns 23 a n d 24 on t h e rear co nn ectors
iden tifies t he F G 504 as α member of t he signal source
family . If t he i n terface is customize d , i n sert b arrie r s in t he
corres p o nd i ng positio ns of t he power m o d ule j ac
k
to
p reve n t ot herthan signal source p lug-i
n sfrom being use d
in t h ose compa r tments . T h is p rotects t he plug-in sh oul d
specialized con nections be ma d e to t h ose com p artments .
Cons u lt t h e B uil ding Α System sectio n of t he power
module ma nu al for furt h er information .
Custom Timi ng Capacitor Selectio n
T h
is
feat
u
re allows t he userto select α swept fre q uency
ra n ge . P lace t he MUL TI PL I ER i n t he .5 Χ 10' positio n . T he
factory installe d capacitor p r ovides α swe p t ra nge of
20 Hz to 20 kH z . F or exam
p
le, to
calculate α custom
range, assume α swe p t frequency range of 10 Hz to 10 kH z
is desired . Figure 1-2s h owst hatnofixed multiplier setting
incl ud es t h e d esired limits . T hevalue of t
h
e cap acitort
h at
m u st b e installed is
determin
e
d
by
t h e following formula :
REV
Α A PR 1980
CCUS
=
2200
F ΜΑΧ
Ph ase
M
o
d ulated Ope r ation
M ai n tenance- F G 504 (S NΒ 040000 & UP
I
w here Cc u s is
in μ F ; an d
FΜΑΧ ,
is t he maximum fre quency
re qu ire d . Apply
t h e formula to t he exam p le :
Cc u s =
0 .22 μ F .
Use α cap acitor of any
desire d value . If t he capacitor is
mou nted in t h e i n strume
n t, ph ysical size is t he only limi-
tation . L ow
lea k age capacitors using mylar as dielectrics
p r ovi d e t he truest waveforms .
Α ju mper locate d on t he L oo p board allows t
h
e
V
C
F
I NPU T to f un ction as α p hase modulating in
pu t w h en t h e
F G 504 is o p erated i n the
PH
AS
E L
OC
K loop mode . T h e
locatio n of t
h
is ju
m p er is sh ow n i n t h e illustration on t he
Internal
A dj ustments P rocedure fol d out page at t h e rear of
t h is man u al . T h e p h ase mo d ulating i n put
voltage limits are
±2 .5 V, wit h an upper
f r
eq
uen cy limit of 1 kH z . Wh en
p h ase loc k ed,
t h ep h ase mo du lati n g voltage varies t he
out pu
t ph ase by a pproximately 5°/ V .
5- 7