Wavetek 3001 Instruction Manual page 148

INTROD U CTIO N
Option 3 is α circ uit brea ker in the RF
o
utput system Of
t h e instrument, Th is
p
revents d amage to the RF output
syste m in
t
he event t h at large RF sig n als are fed into the
signal generator w hile testing α t ι asnceiver . In
a
dd ition to
t
h e RF protectio n , the option contains α DC bloc k wh ic h
will pr event
d
amage to
t
he Aτtenuatnr if the RF output is
connecte d to α εί r ειι l ι operatin g at a DC potential .
T
his info rmation applies to all 3000 Series instruments
except
M
odels 3002, 3004, and 3006 . Fo r these
instrumen ts the Μ 35 .1 is
r
eplace d by Μ35-2 . whic h p erm its
operatio n fr o m .001 to 520 MH z, but
d
oes not include DC
b
lock i ng. All ot h er specifications, operating instructions,
and
d
escriptions apply.
S
PE CI F ICATIO NS
ΝΟΤΕ
F re que ncy
R
ange
1 to 520 MHz
Insertion
L
oss' <.2 ιΙ 8
V
SWR" -' 1 1! ι
Tri p Ti m e
< 2
m
sec
RE
T
rip Level
" ,7 W
Max R F
50W
OC Bloc king Voltage 100 V olts
' This loss is calibrated out when th e option is i nstalled in
t
he signal generator .
' χ
T h e
V
SWR π1 the gene rator is increased to <t .25
w h en this o
ption is installed .
OP ER ATI N G I NST R UCTIONS
If an external RE voltage of approximately 6 VRM$ or
more is acci dentally applied to the instrument's RE output
connector, an inte rnal switch in series with
t
h e RE Output
will open . Th is
p
revents
d
amage to the instrum ent's
Attenuator or Output Am p lifier . This open switch wilt b
e
indicated on
t
he front panel by the flash ing of
τ
hη
UNLEVELE D ligh t . Once the switch is tripped, it will
latch in th e open position
a
nd remain open until reset .
Also, α combinatio n π1 α
h
ig h mismatch ,
h
igh output level
(ove r Τ
V) an d changing frequ ency can cause the circ u it
br ea ker to trip.
OPTION 3
R EVER S E POWER PR OT ECTIO N
After r οιτιονίηη the RF signal ca using t he overload , ιh ι~
switch can be reset by
M
omentarily turning the front-vanpi
AC
P
OW ER switch
off
NOTE
N
ormal operation of the UNLEVELE D light is α stead y
glow if
t
h e inst r u ment is u
nleveled. If the circuit
b
reaker is
tripped
w
h ile t h e
instru ment is un leveled , the
UNLEVELE D light will
v
ary in intensity instea d of Γιατ h m η
on
and
o
ff.
THE O R Y OF O PERATIO N
F
ιηυ rr 3!3-1 rs α
b
lock dωgrαιιί ο (
t
he RF circuit brea
k
er .
T
h is
b
lock diagram, along
w
it h the Μ35-1 Sche matic,
should be used 1π follow the i n for matio n co ntained in this
τeεΓ ' ιιη
With the instrument's
P
OW ER switch set to t he O FF
ρο sit~ ηη , relay Κ 1 ; τ in its no rmally open
p
osition. Th is
ρ rενεπιτ any
d
amage to t h e instrume nt whale it is not in
use, As soon as AC power is applied to t h e i nstrum ent. ICI
will ιη m ιιπίe IN- νιιΙ 1αηε from
R
F monitor CRT In α ΓίχινΙ
reference voltage ο1
a
pproxi mately 5
V . As long as The
οιιτπιιt of
t
he monitor is less than the 5 V refe rence νπΙτα4c,
the οιιtςιυ[ of ICI will
b
e app roxi mately +17
V,
Th is ρο s-
ίιίνΡ ιιιιιςιιι t from ICI turns on
t
he relay d river, Ql . This
energizes relay Κ 1,
t
hus completing the RF output circuit
The
p
ositive output from ICI also turns on ο2.
T
h is
effectively grounds
p
i n 7 of ti mer IC2, whic h is bei ng
οfιΗιαι e ιΙ as an asta ble oscillator . With pin 7 groun d e d, the
timer is inoperative,
a
nd its output, pin 3, is
h
igh. The
high output
f
rom Ιε 2 turns off 03, Th is p
revents any
cu rr ε m flow to t h e front- panel UNLEVELE D light.
Ι+ an external RF signal exceed ing 6 VRMS is αμςλίeλ ε,
t h e ιιιτι rυme ητ 'τ RE output connector, t
he ill from
mο m bir ιh οde C R I will go above 5 V, T his will ριοdιιε~
α
n
egative output
f
rom ICI . The p ositive 1eed hac4 .
Provided by R
7 will latch ICI in th is state. The negatl νe
ουιιπιι from ICI will turn off
r
elay driver 01 This causes
relay Κ 1 TO return to its no rm ally open position, removinη
t
he " εετηαΙ RF τίηηαΙ from The i nstr umen t,