Tektronix PG 508 User Manual

To u se t h is feat ur e, p lace t h
e
DD
501 i n t he d elay
interval m o d e of o p eration b y moving
t h e wi r e st r ap as
s
h
ow n i n Pig . 1-5or cha n ging con n ectio n
s, de pe nd i ng on
t he DD
501 availa b le . Co nnectthe P G 508 a n d t he DD 501
as sh ow n in F ig . 1-6 . U
se te n i n c h (Te k t r on ix P art Nu m b er
012-0208-00) o r sh orter cables
forinterconnecting t h etwo
u nits to r ed uce d elays .
M ake certai n t he PG 508 TRIG/GATE IN i nput im-
p eda nce is set for 50 Ω . (See E xternal Triggering
an d
Gati n g d isc u ssio n an d Fig . 1-2 .) Set t h e controls
of
t h
e
P
G 508 for t he desire d output waveform wit h t h eP G 508
i n FREE R UN .
Do
n
ot
use t h
e SQ W
A
VE mo de . Place t h e
P G 508 i n t h e - Ι - S L O P E, SY NC
GATE mode a
n
d set t h e
TRIG/GATE L EV E L control at t h e 2
o'clock
p
osition
.
Select EVENTS -+- S L O PE, STA RT+ S L O PE and
place the
EV
E
N
TS a nd STA R T LEV E L co n trols at t h e 2 o'clock
p ositio n
on
t he DD 501 . T h
e
t h
ree TRIG'D lig h ts on t he
DD 501 an d t h e TRIG'D/GATED
lig h t on t he P G 508 will
b
e
off
until t h e DD 501 is t r igge r ed . Up o n receipt of α
trigger, all lig h
ts
will ill u mi
nate . If n ot, check t he set up an d
slig h tly a d j ust t he L E VEL co n trols
as necessary .
RE V . Α ,
A PR . 1977
25 n s
, . ._ _ .__
.. ο
PG 508
+ T R
IG O U T
At
PG 508 r ep etitio n rates b elow abou t 20 MHz t he ext r a pu lse cou n t is
o
ne . Fr
o
m
ab out 20 MHz to 50 MHz t he w orst case ext r a
pu
lse co u nt is two . T he a bove conditio ns a r e t r ue only wit h te n i nch or sh
o
r te r interco
nn ecti n g cables .
Fig . 1-7 . Typ
ical pr op agatio n d elays u sing PG 508 wit h DD 501 i n cou n ted
bu r st m ode at 50 MHz re p etitio n rate .
_
χ
STA R
T TRIGG ER TODD 501
(5
n s o r lo nge r )
DD 501 DE L AY I N TER V A LO
U
TP
U
T
25 n
s
35
n s_ . .

Ι
TOTAL TIME FROM DD 501 STA R T TRIGGER
TO F I R ST PG 508 PUL SE
IS
-
85 ns .
Operating I n st r uctio n s- P
G 508
Set t h e EV EN TS D EL AY CO U NT Οη t he DD 501
fo
r
o
n
e
less t h a n t he d esired num b er of cou n ts up to P G 508
re p etitio n r ates of ab out 20 MH z . See below fo r f u rt he r
i n for m atio n . If n
ecessary, α single t r igger maybe o b tai ned
by r otati n g t h e DD 501 START LEV EL
co
n t r
ol t hr oug h t he
0 p ositio n , wit h no extern al trigger applie d . Α si n gle t r igge r
may also be obtai n edby u si n g t he TEKTRONIX ma n ual
(O
n
eS
h
ot) Trigge r Generator, Te k t r onix P art Nu m be r
016-0597-00 .
All ot
h
e
r
DD 501 a nd P G 508 o pe r ati ng
co n trols fu n ctio n normally .
Due to p ropagation d elays in t h eP G
508,
DD
501 an d
t he i n terco nn ecti ng cables, one or more pulses in a dd itio n
to
t h
e desi
r
e d n u m be r are generated w hen t h eP G 508
re p etitio n r ates a r e set
between 20 MHz and 50 MHz .
T h ese ext r a p u lses are consistant for
any given fre q uency
i rr esp ective of the d esire d EVEN
TS DE L AY CO U NT
setti ng . To determine t h e n u m ber of extra
pu lses for α
give n PG 508 perio d , set t h eP G 508 an d t he DD 501
controls as previously described . Now a dju st t he P
G
508
TRIG/GATE L EVEL o r t h e DD 501 EV ENTS L E V E L fo r t h e
same n umbe r of extra p ulses at DD 501 E VE N TSDE L AY
CO U N T
setting of ze r o a nd n ine .
EXTRA TRIGGER OU TP UT
WH E N
O
PER ATI NG
PG 508 at 50 MHz
Ι
.
<----- D E SI R ED CO U NT
O
F F I VE
EXTRA
P G 508 P
U
L S E O U T PU Τ PUL S ES
αοαα - α i

Tektronix PG 508 Specifications

General

Brand	Tektronix
Model	PG 508
Category	Pulse Generator
Language	English