Display Messages - Keithley 775A Instruction Manual

CAUTION
Be
sure th®
power
line
voltage
agrees with
the
Indicated value
on
the rear
panel
of
the
instru»
ment. FaHu?^
to
heed
this
warning
may
result
In
Instrument
damage.
If
necessary, the
power
jlr^s
voltage
may
fee
changed
fey
sliding the
recessed LINE
VOLTAGE
SELECTOR
switch
to
the required voltage
position. Refer
to
Section
6
for details
WARNING
The Model
775
is
equipped
with
a 3-wire
power
cord designed
to
be used
with
grounded
outlets.
When
the proper connections
are
made,
instrument chassis
Is
connected
to
power
line
ground,
Failurs to
use
a
properly
grounded
outlet
may
result
In
personal
infury
or
death because
of
electric
shock.
2,
Turn
on
the
power by depressing ana
releasing the
POWER
switch
or^
the front panel,
3,
The
instrument
will
then begin operation by perform-
ing a
display
and
indicator test for
ohout
one
second.
Ail
mode
and
IEEE mdicators
will
turn
on and
the
display
will
appear
as follows:
8
.
8
,
8
.
8
,
8
,
8
.
8
.
8
.
8±8
To verify
that
all
display segments
sre
operating,
com-
pare the instrament's display
during
the
iesc
wnth
the
above
figure.
4,
Once
the
test is
completed, the instrument
w'Ui
perform
ROM
and
RAM
tests. If all
these
tests
are
passed,
the
display
will
show
the soffeware revision levei for
about
one second
similar
to
the
example
below;
SoFt A.l
5.
Following
the software revision
level,
the
instrument
will
display the default
IEEE primary address
which
is
set
by
the
IEEE
address switch
on
the rear panel, For
example, with
the rear panel switch
set to
address
23,
the display will
show:
IE
Adr
23
6.
Following these display messages,
the
instrument
will
go
into
the
normal
operating
mode
and
Is
ready
to
take
readings.
The
instrument
will
be
in
the following
configuration:
®
Freq
A
^
Gate/Delay Time «
iSec
®
Trigger
Le'^'^ls
=
0.00V
* Filters;
Off
* Attenuators: Off
« OC/AC:
DC
« Slope;
Positive
«
Mode; Normal
«
IEEE
Status: Local
«
Displayed
digits;
9
7,
If
any
of the
power
tests
fail,
the
instrument
will lock
up and
display
an
error
message
as follows;
FAtAL
Err
1
it
is
recommended
that the
power-up
procedim-' be
repeated
several times to verify that a cun.sistent error
occurs;
if
so, a
problem
exists in the
instrument. Sec Sec
bion 6 for
troubleshooting
information.
2.5
DISPLAY r^ESSAGES
The Model
775 has
two
display
messages
associated
with
basic front
panel operation.
One
message
indicates
th,at
Model
7751 option
is
not
installed,
the other
that gate tnue
or delay time are
user
selectable.
Note
that the instrur.nent
has
a
number
of
additional display
messages
a.ssooated
with iEEE-488 programming.
2.5,1
Ho
Option
Message
llie
Model
7751 option must
be
installed in the
instruir.eni:
before
it
can measure
frequencies through
the
channel C
input
terminal,
if
the
FREQ C
button
is
depressed
.jnd the
Model
7751 option
is
not
installed,
the foilowing message
will
be displayed:
no
C
oPt
NOTE
There
are
no additional sottwaro modifications
re
-
qui.red after
the
Model
7751
option.
Is
installed.
After the
Model
7751 option
is
installed, the
no
option
message
will
no
longer be displayed,