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Operation
Table
4
1
Setup
data paths
Setup
data path
Action
required
Display-Memory
Display-
Relays
Front
panel keystroke
Front
panel keystroke
or an auto-
matic
copy
(Note
1
Memory-Display
Memory-Relays
Memory
-Controller
Memory-Memory
Front panel keystroke
or
an
automatic
operation (Note
2)
Bus
command
or
any
valid
trigger
Bus
command
Bus
command
Re
lays-
Display
Relays
-
Memory
Relays-Controllcr
Front panel keystroke
or
an
automatic
operation
(Note
3)
Bus
command
Bus
command
Controller-Memory
Control
ler-Relays
Bus
command
Bus
command
Notes:
1.
Generation of
the
automatic
copy
is
selected
by
a
front
panel
key.
(AUTOMATIC LED
is
lit.)
2.
The
automatic operation
is
generated
if
the
displayed setup has
been
changed by
a bus
command
and
has not
been modified from
the front
panel.
(MEMORY
LED
is
lit.)
3.
The
automatic operation
is
generated
if
the
displayed setup has
been
changed by
a
trigger
or bus
command
and
has not been modified
from
die front
panel.
(RELAYS
LED
is
lit.)
4.
Controller modifications
to
setups are
reflected
on
the
crosspoint
dis-
play
if
the affected
setup
is
currently
being
displayed.
5.
Front
panel keystrokes
can be generated by bus
commands.
4.3
Power-up procedure
The
steps
in
the
following paragraphs take
you
through
the
basic
procedures
for selecting the line voltage,
connecting
the
instrument
to line
power,
and
turning
on
the instrument.
4.3.1
Line voltage selection
The
Model
707
A
operates
from
a
line
voltage
in
the
range of
100
to
240V,
at
a
frequency of
50
or
60Hz. Line
voltage
and
frequency
are
automatically sensed, therefore
there are
no
switches
to
set.
Check
to
see
that
the
line
power
in
your
area
is
compatible.
4.3.2
Line
power
connections
Using
the
supplied
power
cord,
connect
the
instrument
to
an
appropriate
50
or
60Hz
ac
power
source.
The
female
end
of
the
cord
connects
to
the
ac receptacle
on
the rear
pane!
of
the
instrument.
The
other
end of
the
cord should be connected
to
a
grounded
ac
outlet.
WARNING
The
Model 707A
must
be
connected
to
a
grounded
outlet
to
maintain continued
protection against
possible
shock
haz-
ards. Failure
to
use a
grounded
outlet
may
result in
personal injury or
death
due
to electric
shock.
4.3.3
Power
switch
To
turn
on
the
power, simply push
in
the front panel
POWER
switch.
Power
is
on
when
the
switch
is
at
the
inner
(1) posi-
tion.
To
turn
power
off,
press
POWER
a
second
time.
4.3.4
Power-up
self-test
and
messages
During
the
power-up
cycle, the
instrument performs
the
fol-
lowing
tests.
The
first
five
operations
are transparent
to the
user unless
an
error occurs.
1
.
A
checksum
test
is
performed on
ROM
and
a read/write
test
on
RAM.
If
an
error
is
found,
the
self-test
continues
and
the
unit
displays
either
ROM
FAI
T,
or
RAM
FAIL
when
the
test
has completed.
You
can
override
either
type
of
error
with a
front
panel
keypress.
The Model
707
A
will
attempt
normal
operation.
NOTE
If
a
problem
develops
while
the
instrument
is
still
under warranty
(less
than
one
year
from shipment
date),
return
it
to
Keithley Instruments,
Inc.
for
repair.
For
units
out of warranty
refer
to
Section
6,
Maintenance.
2.
The Model
707
A
reads
identity
information
from
each
card
and performs
a
checksum
test
on
the data.
If
the
checksum
test
Mis
on one
or
more
matrix
cards,
the
instrument
displays
CARD
ID
ERROR
and
lights
all
crosspoint
LEDs
of
that
card.
Any
keypress
will
allow
the unit
to
continue.
An
empty
slot will
not
produce
an
en'or.
3.
A
checksum
test
is
performed on
all
setups
in
memory.
If
the
instrument
detects a
checksum
error
in
one
or
more
stored
setups,
it
displays the
message
SETUP
ERROR
and
clears the
crosspoints
bits
of
the setup(s)
in
error.
The
message
remains displayed
until
a
key
is
pressed.
NOTE
The
SETUP
ERROR
message
may
be an
indication
of a low
battery.
Cycle
power
off
and
on.
If
the
message
reappears, see
paragraph
7.7
for
battery
replacement
procedure.
4-2
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