Tektronix 2235 - Page 31

Dis p layi n gα
T VF ield- r ate Sig n al
1 . Obtain α
Signal Dis p lay of t he desire d TV signal (see
"Signal Display" p
rocedure) .
2 . Set t h e
following con trols :
Α SE C/DI V
2 ms
Α TR IGG ER
M
ode

TV F I EL D

NOTE
Α&Β ΙΝΤ

E it he r CH 1 or C H 2,
app
ropriate

To examine α
TV Field-rate signal in more
detail,
ei-
ther the
Χ 10 Magnifier or HORIZONTAL MODE func
3 .
P
erfo
r m Step s 3 and 4 un de r t he p recedi n g "Dis p lay-

tions
may b e employed as previously described i n t he
ing
α
TV L ine-rate Sig n al" p r ocedu re .

subsection of the manual .
4 . To d is p lay eit h er F ield 1 or F iel d 2
individually at faster
swee p rates (dis p lays or less t han on e full fiel d ), set
VER TI-
CA L M OD E to BOTH and ALT simu ltaneously .
T h
is syn-
c
hr onizes t h eC h annel 1 dis p lay to one fiel d and t
h
e C
h
a
nn el
2
dis p
lay to t he ot he r field .
O p
e
r ating
Inst
ru
ctio
n s-2235 Service
To c
han ge t h e field t h at is dis p laye d , i n te rr upt t h e trigge
r -
ing eit h er b y r epeated ly setting t he AC-G N D-DC switc h to
G ND or by disco n necting an d reconnecting t he signal from
t
h
e
input connecto r until t he ot h er field is dis p layed . To dis-
play b ot
h
fields
simultaneously, apply t he in p ut signal to
b ot
h t h
e C
H 1 and C H2 i npu ts, using either two probes, two
cab les, or
α dual-input coup ler .
5 . To dis p
lay α selecte d h orizo n tal li n e, first trigge
r
t
h
e
swee p
on
α vertical (field rate) sync pulse, t hen u se t
h
e de-
layed swee p to d elay out to t h at line for close
exami n
atio
n .
T h
is p
rocedure is useful fo r examining V ITS sig n als .