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GETTING STARTED
WARNING
The Model
194 is equipped
with a 3-wire
power
cord that contains
a separate
ground
wire and
is designed
to be used with
grounded
outlets.
When proper
connections
are made, instrument
chassis
is connected
to power
line
ground.
Failure
to use a grounded
outlet
may result
in
personal
injury
or death
because
of electric
shock.
CAUTION
Be sure that the instrument
is being
operated
on the correct
line voltage.
Failure
to observe
this
precaution
may
result
in
instrument
damage.
If necessary,
the operating
voltage
can
be changed,
as discussed
in Section
7.
2. Turn on the power by pressing
in the front panel
POWER switch. The switch will be at the inner posi-
tion when the instrument
is on.
3. The instrument
will then begin performing
a self test
as described in the following
paragraph.
2.4.2 Power Up Self Test and Display
Messages
When power is first applied to the instrument,
it will per-
form a self test procedure to determine if any internal faults
exist. The self test sequence consists of a ROM checksum
test, a RAM test, and various hardware tests. During the
self test period, all LEDs and display segments will be on,
giving
you an opportunity
to check for proper display
operation. Immediately
preceding the self test, the follow-
ing message will be displayed:
SELF 'TESTING
Assuming all tests are passed successfully, the instrument
will display the following:
SELFTEST PASS
Followed by:
KEITHLEY
194
NOTE
If an NVRAM fault occurs in one of the modules,
the instrument
will not be able to recognize that
module.
If such an error occurs, the unit will
display a CAN'T IDENTIFY
error message for the
appropriate
channel.
In this case, it will
be
necessary to program
module
recognition,
as
described in paragraph 7.4.2.
Following this display, the instrument
will display the pro-
grammed IEEE-488 address and software revision level, '1s
in the example below.
REV. D2.2 IEEE=09
In this example, the IEEE-488 address is the factory def~~ult
value (9), and the software revision level is D2.2. The soft-
ware revision level of your instrument may be different and
should
be recorded for future reference should
it ever
become necessary to replacc the internal ROM memory.
After this message, the instrument
will C'ntcr the uper;~
tional mode. Table 2-4 lists the factory default values for
the instrument
when it is first turned on. N<>te that vc1u
can press SHIFT RESET to return the instrument
to thaw
default conditions, if desired (assuming you haven't altered
the SETUP I configuration).
If any errors are found during the self test srquenw,
the
instrument
will not begin normal operation,
but \vill ins
stead display appropriate error messages as an aid in deter-
mining
the fault. These error messages are discussed in
Section 7.
NOTE
If the instrument
is still under warranty (less than
one war
from date of shiDmcntJ.
it should
bc
returned
to Keithley
Instruments
for repair. See
paragraph
1.10 for details
on
returning
the
instrument.
Table
2-4.
Factory
Default
Power
Up Conditions
Filter
Trigger Mode
Trigger Source
Trigger Delay
Trigger Slope
Trigger Level
Sample Rate
Input Coupling
Measurement
Size
Reading Function
IEEE Address
Disabled
Continuous
Immediate
(TRIGGER button)
0
Off
ov
166.7+zec
DC
101 samples
Average
09
NOTE: These modes will differ if the SETUP ~1 cunfigura-
tion is changed.
2-13
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