NOTE
Both
power
up
and
factory initialization
will
default
the
unit
to
the
last
programmed
line frequency setting.
2.1
0.5 IEEE-488
Bus Address
This
menu
item allows
you
to
check
and/
or
change the
IEEE
address
of
the
Source Measure
Unit.
At
the
factory,
the Models 236,237
and
238 are set
to
address
16. Valid
addresses are
00
to 30.
To check
the
present IEEE address
and
other operation
menu
item parameters, enable MENU
and
use
the
rotary
knob to scroll
through
the
menu
items.
If
no
changes are
to
be
made, disable MENU to
return
to normal operation.
Perform
the
following steps to change the IEEE address:
1.
With MENU enabled,
turn
the
rotary knob until
the
present IEEE address is displayed. For example,
if
the
present address is 16,
the
following
will
be
dis-
played:
16 IEEEADDR
2.
To change the IEEE address, key
in
the
new
value
(00
to30).
3. With a valid address keyed into
the
display, press
ENTER. The next
menu
item
will
be
displayed.
4.
If
no
other
menu
actions are to
be
taken, disable
MENU to
return
to
the
source-measure display state.
2.1
0.6 Display
Test
The display test is
used
to check for defective display
LED segments
and
front
panel
indicator lights.
When
this
test is run, all display segments
and
indicator lights will
be
turned
on
for several seconds.
Perform the following steps to perform
the
display test:
1.
With MENU enabled,
use
the
rotary knob to display
the
following message:
DISPLAY
TEST
+
+
SECTION2
Operation
2.
Press ENTER. All display segments
and
indicator
lights
will
turn
on
for several seconds. The next
menu
item will
be
displayed.
3.
If
no
other
menu
action are to
be
taken, disable
MENU to
return
to
the
source-measure display state.
IEEE-488 Bus
Operation
The
J2
command
is
used
to perform
the
display test from
over
the
bus.
HP
BASIC
4.0
Programming
Example:
OUTPUT
716;
"J2X"
Perform display test
2.1
0.
7 Memory Test
The memory test is
used
to perform tests
on
its memory
elements.
If
the
tests fail,
one
or
more
error
messages
will
be
displayed. A brief explanation
of
any
displayed error
message is contained
in
Table 2-3.
In
the
event
of
a failure,
refer to
the
service
manual
for troubleshooting informa-
tion.
NOTE
If
the
instrument
is still
under
warranty
and
if
a problem develops,
it
should
be
returned
to
Keithley Instruments, Inc. for repair.
Perform
the
following steps to perform the memory test:
1.
With MENU enabled,
use
the rotary knob to display
the
following message:
MEMORY
TEST
2.
Press ENTER to perform
the
test. After
the
test is
completed,
the
next
menu
item will
be
displayed.
3.
If
no
other
menu
actions
are
to
be
taken, disable
MENU to
return
tot
he
source-measure display state.
IEEE-488
Bus
Operation
The
J1
command
is
used
to perform
the
memory test from
over the bus.
HP
BASIC
4.0
Programming
Example:
OUTPUT
716;
"J1X" Perform memory test
2-41
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