Tektronix 434, Instruction Manual

Page: 18 / 222

Operating Instructions—434
C O U P LIN G (cont)
if LF REJ and HF REJ are in
o u t p o sitio n.
MODE
LF REJ: Rejects DC and attenuates
signals below a p p ro x im a te ly 30
k ilo h e rtz . Accepts signals
between a b o u t 30 k ilo h e rtz and
25 megahertz.
HF REJ: A ttenuates signals above
a p p ro x im a te ly 50 k ilo h e rtz .
Accepts signals between DC and
a p p ro x im a te ly 50 kilo h e rtz .
L E V E L Selects the am p litu d e p o in t on the
trigger signal at w hich the sweep is
triggered.
SLOPE
Selects slope o f trigger signal w h ich
starts the sweep.
+: Sweep can be triggered fro m
positive-going p o rtio n o f trigger
signal.
—: Sweep can be triggered fro m
negative-going p o rtio n o f trigger
signal.
RESET
E X T T R IG
(Rear panel) In p u t connector fo r external trigger
signals.
Sweep
PO SITION
C ontrols h o rizo n ta l p o s itio n o f the
display.
R E A D Y L ig h t
T IM E /D IV Selects the sweep rate o f the sweep
generator (V ariable c o n tro l m ust be
in the C A L po sitio n fo r indicated
s w e e p
r a t e ) . E x t r e m e
co u nterclockw ise po sitio n o f sw itch
selects E xternal H o rizo n ta l mode o f
ope ra tio n .
E X T H O R IZ
(Rear panel)
MAG
Push-to-turn switch (concentric
w ith T IM E /D IV sw itch) provides
sweep m ag n ifica tio n up to a
m axim um o f 50 tim es. Extends
fastest sweep rate to 0.02 /is/’div.
Storage
STORE
(U pper and lower)
Variable
(N o t labeled)
Provides uncalibrated sweep rates
between
the calibrated settings
selected by the T IM E /D IV sw itch.
The sweep rate in each T IM E /D IV
sw itch po sitio n can be reduced to
at least the sweep rate o f the n ext
adjacent
po sitio n to provide
co n tin u o u s ly variable sweep rates.
E N H A N C E
(U pper and low er)
ERASE
(U pper and lower)
D eterm ines the operating mode fo r
the sweep generator.
A U T O : In the A U T O position
(b u tto n in) o f th is pu sh b u tto n
sw itch, the sweep is in itia te d by
the applied trigger signal. In the
absence o f an adequate trigger
signal, the sweep free runs and
provides a b rig h t reference trace.
N O R M : In the NORM position
(b u tto n in) o f th is pu sh b u tto n
sw itch, the sweep is in itia te d by
the applied trigger signal. In the
absence o f an adequate trigger
signal, there is no trace.
S IN G LE SWEEP: When b o th the
A U T O and N ORM switches are
pressed in the sweep operates in
the Single Sweep mode. A fte r a
sweep
is displayed, fu rth e r
sweeps cannot be presented u n til
the RESET b u tto n is pressed.
When the RESET b u tto n is pressed
(in the S IN G L E SWEEP m ode), a
single display w ill be presented
(w ith co rre ct triggering). A fte r the
sweep is com pleted, the RESET
b u tto n
m ust be pressed again
before another sweep can be
displayed.
Indicates sweep has been reset and
a single display w ill be presented
upon receipt o f an adequate trigger
signal.
In p u t co n n e cto r fo r external
h o riz o n ta l signal w hen T IM E /D IV
sw itch is set to E X T H O R IZ .
In the STORE p o sitio n (b u tto n in ),
the C R T operates in the storage
mode. In the N on-S tore p o sitio n
(b u tto n o u t), the C R T operates in
th e conventional mode.
In the EN H A N C E p o sitio n (b u tto n
in) the w ritin g rate fo r single-sweep
displays is increased (using th e EN­
H A N C E L E V E L c o n tro l).
A m om e n ta ry co n ta ct sw itch th a t,
when pushed, erases a stored dis­
play fro m the C RT.
©
2-4