Tektronix FG 504

Calibration P roce d ure- F G 504 (S NΒ 040000& UP)
P e r forma nce C h ec k
sweep , measure t he time differe n ce betwee n α p ositive
pea k an d the next negative pea k of t h e waveform . Next
measure t
h
e time differe
n
ce between t he negative pea k
an
d t h
e
next
p
ositive
p ea
k (±1 ο/ο ) .
c . P us h i n the si ne wave button . Connect t he output
t h roug h α 50 Ω
cable
a nd α 50 Ω termination
to
t he
sine
wave distortio n an alyzer . V erify t h at t h e sine wave distor-
tion is 0 .5 ο /ο or less . R emove t he 50 Ω termination an d
move t he
cable
from t he scope input an d connect it
to
t h
e
in p ut of t h e sp ectrum an alyzer . Set t h e MUL TI PL I ER to 10 5
and verify t h at t he greatest h armo n ic is at least 30dB
down from t he fun d amental
.
d . Press t h e s q uare wave
bu
tton in . M
ove t
h
e outp u t
cable from t h e s p ectr u m analyze r , add α 50 Ω termination,
and co nnect it to t h e vertical in p ut of t he
oscilloscope . Set
t he MUL TI PL I ER switc h to 10 4 . Set t he oscilloscope con-
trols as re q uired and verify t he rise and fall times of t he
sq uare wave . (Accuracy with in ±30% of i n dicated time wit h
V
aria b le co
n
trol f u lly ccw, 10% to 90% of t he dis p layed
waveform .) V erify t hat t heab errations on t he waveform d o
n ot exceed 5% +30 m V . C hange t h e R IS E a n d F A LL TIME
switc
h
to 10 ns and verify t h at t he VA R ia b le control h as α
ten to one range
(10
n
s to 100 ns) .
8
.
AM M
o
d ulation
and
Distortion
4-6
α .
Set
t he F
G
504 co n trols as follows :
b . Connect
α 1 kH z, 5 V ρ - ρ si n ewave from
a function
generator t h roug h α 50 Ω cable termi nate d in 50 Ω to t he
F G 504 AM I NPU T . R edu ce t he F G 504 out p ut to 70%
modulation . Connect t h e F G 504ou t pu t to t h e AM in p ut of
t he distortio n an alyze r . T h e distortion sh oul d b e 5°/ ο o
r
less .
9 . TR IGgered, GAT E d, and PH AS E L OC K Operation
α . Set t
h
e
F
G 504 co
n trols
as
follows
:
b . Connect t he O UT PU T from t he F G 504 t h roug h α
50 Ω coaxial cable to t he vertical i n put of t he oscillosco pe .
Connect α
1
V ρ - ρ 200Hz si
n
e wave to
t h
e
T R IGG ER
section I NPU Toft h e
F
G 504
.
Ad j ust t
h
e
LEVEL
co
n trol
for
α triggere d output from t he F G 504 . R otate t he F G 504
LEVEL control cloc k wise to t h e ΜΑΝυαΙ
p osition . V erify
t h at t h e F G 504 p uts out o ne cycle of signal eac h time t he
ΜΑΝυαΙ butto n is presse d .
c . Press t he GAT E b utton in . V erifyt h att he F G 504 puts
out α
continuous signal w h
en
t h
e
ΜΑΝυαΙ button
is
pus h ed . R otate t he LEVEL control cou ntercloc k wise u n til
t he F G 504 out p ut sig n al is gated onand off at t he 200 Hz
rate .
d . Press t h e PH AS E L OC K button in . Set t he FRE-
Q UEN CY Hz STA RT kn ob to 20 . Set t he MUL TI PL I ER
k nob to 10' . Set t
h
e exter
n
al sig
n
al ge
n
erator to 20
kH z at
1 V ρ - p . Set t he PH AS E co n trol to mi d range an da dj ust t he
LEVEL control for α ph ase lock ed signal . V ary t he
REV ΜΑΥ
198
2
H O L D/ RUN p us h button RUN
FRE Q UEN CY Hz
(STAR T) dial 20
STO P dial 40
MULTIPLIER 10 1
FRE Q UEN CY VERN I ER
(V A R) F ully cw
T R IGG ER / FREE RUN
p us h button FREE
RUN
LEVEL control M i d range
S WEEP pus h butto ns O u t
W aves h ape pus hb uttons Sine
W
ave In
O FF SET co n trol M i d range
PH AS E control M i d range
S WEEP DUR ATIO N
switc
h Off
V A R iable F ully ccw
R IS E and F A LL TIME
switc h
FIX E D
V A R iable F ully ccw
ATT ENU ATO R ( d B) 0 dB
V A R iable F ully cw
T R IG LEVEL M idran ge
SY MME TRY M i d range
H O L D/ RUN push butto n RUN
FRE Q UEN CY Hz
(STA
R
T) d ial 20
STO
P d ial 40
MUL TI PL I ER 10 2
FRE Q UEN CY VERN I ER
(V A R) F ully cw
T R IGG ER / FREE RUN
pus h button TR IGG ER In
LEVEL control A dj ust
for
Triggered
operation
S WEEP pus h butto n s Out
W aves h ape pus h buttons Si ne wave
O
FF
S
ET control M i dran ge
PH AS E control M idran ge
S WEEP D UR ATIO N
switc h Off
VA R iable F ully cw
R IS E and F A LL TIME
switc h F
IX ED
V
A R
iable
F ully ccw
ATT ENU ATO R (d B ) 0 dB
V A R iable F ully cw
T
R
IG LEVEL
M idrange
SY MME TRY M idrange