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Α
p
owe r
m
eter
can
b e
use
d
to
-check t
h
e
RF
level
ove r α range
of
0
to
30
dB ;
w
h
ereas,
α
s
p
ect r
u
m anal y zer is re
qu
ire
d
to
c
h
ec
k
t
h
e entire 0 to 90
dB
ra
n
ge .
W
ith
α
power
meter
or
spectr um
a
na l yz er co nnected to t he instrument RF
OUT
connector,
set
the
front-panel
attenuato r s f o r
α conve
n
ίent' re f erence
on t he
power meter
or
ana ly zer
wit h
rem ote programming set for
0 dB ;
then
step
through r emote programming
in 10
d B steps
from 0
to 90 dB .
The o
u
tp
u
t
should
be
wit hin
accuracy
specif ications
as
given
for
this
option .
The f o ll owi n g
procedure
i
s
r
ecom m en de
d
to
i n s
u
re
proper
operation
of
the
Pr otection C i rcu i t .
The to
p
cover
m
u
st
be removed fr om th e
i n strumen t .
W
it h
i
nstr u ment operat ing
normally
at
100 MHz 1η
t
h e
C
W
m
ode, connect α 50 R
detector
to
t h e
instrumen t
RF
O
UT
connector
a nd set output
l
ev el to
+5
dBm .
M
on i tor
t
h e detecto r D C output on
α
s
u itab le osc ill oscope .
Circuit r y in A tte nuato τ
Dr ive r
Μ42
i
s
c
h ec ked by p
u
s hin g the momentary sw i tc
h
l
ocated
on
to
p
o f t
h
e
m
odul e .
Thi s
switc h l ow ers
th e tr ip
l
ev el
o
f
t
he
mod
u
le .
W h i l e
h
old ing
th e
swi tch
c
losed,
u
se
t he
fron t- pan el
OUTPUT
V
ERNIER to slowly in cr ease ou tput
l
eve l
un ti l
t
he Protection
Ci r cui t
trips .
Th is
cau ses
the
UNL E
V
ELED
lamp
to
flas h,
an
d
t
he osci ll oscop e
to go
to
zero .
The circuit can b e reset by momentarily
turning
t h e
A
C
POWER
switch
o
ff .
P
erf orm t he same
test α [ 500 MHz .
At
100 MH z , t he
pr otection circuit s hould
trip
at
+7 .5 dBm _+1
d
B ;
whereas,
at
500 MHz ,
i
t should
t
ri
p
at an
out
pu
t
l
evel
of
+10 .5 dB
m
+2 dB.
Additional
tests can be performed as desired .
For
exa mpl e, V SW R
a
nd insertion
l
oss can be
check e
d
i
n
t h e
same
manner
as
any
pass ive d e v ice .
Al so, if availab le,
α
high-power R F-s i gn a l sour ce, set for an
8/1Β- 4
o
u
tp u t
of
s li g h t ly ove r 0 .7
W,
can be
used
to
ve r i fy
Protection
Cir cuit
operat i on .
SC
F
λ
FM
ATIC AND
P
A
R
TS
L
I ST
Th e
Option 1 Β Schematic and app l icab l e
P
arts
L
ists
a r e
inc lude d
1 π
this
sectio n .
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