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Model
5315A/
B
Operat ion
3-2
3-10.
FREQ A
3-11
.
Frequency
measurements
are
made
by
connecting
a
signal (up
to 100
MHz)
to
INPUT
A,
and
pressi
ng
the FREQ
A
function key
(w
ith the
Blue sh ift key
out
). Select
t he appropriate
inp
ut
signal
con
d ition
ing
and adjust
t
he
LEVEl/
SENScontrol
(w
ith TRI
GGER LEVEl/SENS ITIVITY key
to
TRIGGER
LEVEL)
to
opt
imum trigger point. The optimum
t rigger poi
nt
may
be
determined
by
centering
t he
LEVEl/S
ENS
cont
rol
w ith in
t
he
tr
iggering range, ind
icated
by
th
e
flashing
trigger
light. The
GATE TI
M
E
cont rol determines the
resolution
of t he measu rement, and
may be
displayed by
pressing the
GATE
TI
ME function key
and
Bl
ue
shift
key.
3-12.
PER
A
3-1
3.
The
Period A
mode
all
ows
si
ngle
period
measurements
to be
made
w ith periods o
f
105 s
to
10.0
nanoseconds
into
IN
PUT
A. Select the appropriate
input signal
condit ion
ing,
and
Trigger
l
evel/Se
nsitivity.
3-14.
T.1. A-B
3-15.
T.I.
A-B
measures
the
t im
e
interval
between a
STA
RT
signa
l
at
INPUT
Aa
n
d a
STO
P
signal
at
INPUT
B.
If
bot
h
th
e START
and STOP
signa ls are
derived from
the same sig
nal, connect the
sig nal to
INPUT
A
and
set the SEP/COM A key
to the
COM A
posit
ion
(IN). Separate slope
and
l
evel/Se nsit
ivit
y
con
trols
for
each channel
allow varia ble triggering o
n
eit
her positive
or
negative
going slope.
A single-shot time
interval measurement may
be made over
a range
o
f
100
ns
up
to
8
d
igits
and
10 5
s after 9 digits.
3-16.
T.I. AVG A-B
3-1
7.
The
T.I.
Average
mode
provides greater
reso lut ion
of
time
interval meas urements
th
an
single-shot
T.I.
mode provides. In
th
e T.I. AVG
mode, the gate
t
ime control varies
the number of
eve nts of
time
intervals
averaged
(approximately
GATE
TIME
X
REP
RATE
).
The reso lut
ion
o
f
the
measurement is improved
by
t
he
IN,
w here N is the
number of
time
in
terva ls averaged.
A
limited range
o
f
negat
ive
T.I.
measurements (Le.,
B
t
riggers
before
A
)
are possible
in
T.I.
AVe
mode.
3-18.
In
t
he T.1. Ave
mode,
there
must
b
e at
least
200
ns dead time. Dead
time
is the
ti
me
between
the
preceding
time
interva
l
stop event
and the
cu
rrent
time
interval
sta rt
eve nt,
as
shown in
Figure
3-1
.
This means
that
in
T.
1.
AVG
mode,
t
he repeti
tion rate
must
be less t
han
5
M Hz.
A
-
SLOPE
B
+
SLOPE
START
,
,
, ,
, ,
STOP
START
STOP
:
T.1.
M EASU
RE
D
OEAOTIME
>
200
ns
Figure 3-1.
n.
Average Dead Time
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