Table of Contents
Advertisement
Model 531
5A
/
B
Operation
3-19.
T.I.
DELAY
3-20.
The T.1. DELAY mode o
f operat
ion
is
similar to T.
1.
A-B (paragraph 3-14), but
with
the
following addit iona
l cont
rol:
Th
e f ront panel
GATE
TIME
control
inserts a
variable delay
(f rom
500
J.lS
nom
inal
to
>20
ms
)
betwee
n
the
START (INPUT
A
)
event
and t he
enabli
ng of
the STOP
(IN PUT
B)
event
.
Pot
entia
l
STOP
events are igno red d uring the specified delay
o
r
holdoff. The
amou nt of delay t ime may be conti nuo
usly
measu red and displayed
by
simul
taneously
pres.sing
t he
T.
1.
A
-
B, T.
r.
DElAY, and Blue
shift
keys. Figure 3-2 illustrates
t
he T.
I. D
ELAY
fu ncti
on
.
STAR
T
STOP
,
MEASU
RE
ME
NT
,
DESI
RE
D
T.!.
,
I
,
: -
ACTUAL
T
.I.
MEAS
-...:
,
,
I
,
,
,
I
,
,
,
r
,
r.
"
\J
V
V
ST
ANDARD T
J
. A
- .
S
ST
AR
T
STOP
I
I
DESIR
ED
T.
1.
M
EASUREM
ENT
,
,
I
,
,
AC
TU
AL
T
.I. MEAS
i
I
I
HO
LDOFF
, ,
,
I
,
I
I
,
t
\
,
,
r.
,
,
,
(\;v
,
,
,
V
T
.!.
DELA
Y
Figure
3-2.
T.I. DfLA
Y
3-21.
RATIO
AlB
3-22.
The
RATI
O
AlB
mode of operation measures and displays the freque ncy ratio of signals
on
INPUT
A tosignals
on
INPUT B. The GATE TIME cont rol determines t
he resol
ut ion
by
selecting
the
number of
cycles
of
the
IN
PUT
B signa
l
over
w
hich
t
he ratio
AlB is
measured. Increasing
the
gate
time
(towards
MAX)
or increasing t he frequency of
INPUT
B results
in
an increased
reso-
lut
ion
of
th
e measureme nt. Frequencies
up
to
100
MHz
on
both chan nels are allowed
.
3-23.
A
BY
B
3-
24.
A
BY B
(A gated
by
B)
is a
total ize
mode of operation
(see
Figure 3-3),
in
which
events on
INPUT
A {up
to
100
MHz}
are
count
ed for
a
duration determined
b
y INPUT
B.
The gate opens
on
t
he slope of
Input
B
selected
by
Ch
an
nel
A
Slope, and closes
on
the slope
of
Inpu
t B
selected by
Cha
nnel
B Slope. This
allows
an
yone
of
four
discrete
gate durations from a
sig
nal
on B Input.
The
RESET button must be pressed to initiate a new measurement and refresh the
display.
).)
Advertisement
Table of Contents
