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2,2
FRONT PANEL
FAMIOARIZaTION
Ills
fror.t
panel layout
of
the
Model
775
is
shown
in Figiire
2*1.
The
front
panes
is
generally
divided
into
thi'ee
sections;
controls,
terminals,
and
display
and
indicators. Tlie follow-
ing
paragraphs describe
the
purpose
of
each
of
these items
in detail.
2.2.1
Controls
All
front
panel
controls
except
POWER
are
momentary
contact switches.
Many
controls
include an annunciator
light'
to
indicate
the selected configuration.
The
controls
are color
coded
into functional
groups
for easier
operation.
Front pimei controls
may
be divided
into
the following
functional
groups:
Function,
Input
Set-ting,
Display
Modify
and
Gate.'Ddav Time.
POWER—
d'rie
POWER
switch
controis the A("
power
to
the
instrumeni.
Depressing
and
releasing
the
switch
ones
turns
the
power
on.
Depressing
and
releasing the
switch
a
second
time turns
the
power
off.
Funedon
Group—The
four
FUNCTION
buttons
control the
type
of
measurement.' Each button
is
used
to select
one
of
two
functions.
FR).-,Q—
The
FREQ
button
places the
mstruinent
in
frequen^
cv
measurement mode.
Pressing the
FREQ
button once
turns
she
A
indicator on; Indicating the
instrument
is
set
ior
the
trequenev
A.
mode.
Pressing the
button,
a
.second
time.
:urn.S'
the
B
indicator on; indicating the
instrument
i.s
set
.foi
the
frequency
B
mode.
Pressing
of
the
FREQ
but-
ton
roggio.s
the
measurement between
the
frequency
at
chanru-i
A
and
frequency
at
channel B modes.
PERIOD—
The
PERIOD
button
places the
instrument
in
period
measurement mode.
Pre.ssing
the
PERIOD
button
once
turns the
A
indicator on; indicating the
instrument
is
in
the
period
A
mode.
Pressing
the
PERIOD
button
a
second
time,
turns the
AVG
A
indicatoron;
indicating the
instrument
is
in
the period average
A
mode,
Pressing
of
the
PERIOD
button
todies
the
measurement between
the
period
A
and
period average A.
TIME—
The
TiMH
button
sets
the
Model
775
up
to
measure
the
time
interval
benveen
channel
A
and
B,
Pressing the
TIfvlH
button
once
turns the
A
—
B
indicatoron;
indicating
the
instrument
is
in
the
time intenml
A
—
B
mode.
Press-
ing
t'i'ie
button
a
second
time,
turns the
PLS
A
indicator
on:
in'^icaiing
the
instrument
is
in
the pulse
A
mode,
Pressi.,g of
the
TIME
button
todies
the
measui'ement beh
ween
the
time
interv'al,
A
—
B
and
pulse width
of
A.
MODE—
Press the
MODE
button
once
to place
the
instni"-
rnent
in
the hold
mode.
Pt^ss the
RESET
button
to
dear
the display
and
take
a
reading.
The
reading
will
be held
on
the display
until
the
RESET
button
is
pressed
again.
Pressing the
MODE
button a
second
time,
places
she
Model
in
the delay
mode
of operation; the
instrument
holds
off
closure
of
the gate
for
the selected delay
time.
Pressing the
MODE
button
a third
time
places
the
instru-
ment
in
both
the
hold
and
delay
modes.
Pressing
of the
MODE
button
a fourth
time turns the
indicators
off;
and
places
the mstruinent
in
the
normal
mode
of
operation.
NOTE
The
delay
mode
is
disabled
in
the
frequency
and
period
averaging
modes.
FREQ
C—
The
FKHQ
C
button
allows the
Model
775
to
measure
frequencies
from
50MHz
to
IGHz
on channel
C,
Pressing the
FREQ
C
button turns the
C
indicator on;
in-
dicating the
instrument
is
set
to
make
high frequency
measurements on
channel C.
If
the
Model
7751
Channel
C
option
is
not
installed,
a
'nO
C
OPT
message
will
be
displayed
for tv/o
seconds.
Input
Setting Gitsiip—
The
six
CHAN
A
pushbuttons
cors-
trol
input
attenuation,
coupling,
slope,
trigger
level
and
high frequency
noise
suppression.
The
six
CHAN
B
pushbuttons
are functionalv identical to the
CHAN
A
buttons,
DC/AC—
The
DC/AC
button
selects
either the
AC
or
DC
coupling
mode.
In default position,
the
instrument
is
in
the
DC
coupling
mode.
Pressing the
DO
AC
button
turns
the
AC
indicator on; indicating the
instrument
is
in
the
AC
coupling
rnode. Pressing
of
the
DC/
AC
button
toggles
the
instrument
between
AC
and
DC
coupling
or
the
in-
put
signal.
SLOPE-The SLOPE
button
selects
the slope
that the
Model
775
will trigger
on.
In
default position, the
instru-
ment
triggers
on
a positive
going
edge. Pressing the
SIX^PE
button turns
the
"
N
"
indicator
on;
indicating
the
in-
strument
will
;trigger
on
a
negative
going
edge.
Pressing
of
the
SLOPE
button
toggles the
instrument
between
the
positive or negative
edge
trigger.
ATTEN—
The
ATTEN
button
controls
the attenuation
of
the
input
.signal.
In default position,
the
signal
will
not
be
at-
tenuated. Pressing the
ATTEN
button
turns the xiO
in-
dicator on; indicating that
the
instrument
will
attenuate
the signal
b>' ID.
Pressing
of
the
ATTEN
button
toggles the
instmment
betw^een the xl
and
xlD
input
attenuation.
Note
that
changing
attenuation
changes
the
trigger
level, (e.g.
IV
digger
on
xl
goes
to
lOV
on
xlO).
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