Keithley 236 Service Manual

SECTION
2
Calibration
Table 24.
Calibration Error Messages
Message
Expianation
IN CAL
Tried
to set
the instrument
to
a state
that
is illegal
while in the calibration mode.
Legal
com
mands include;
C
(calibration), N (operate/standby), 0
(output
sense)
and
U
(status) From
the front panel, only operate/standby and
output sense can
be
set.
All illegal commands and
operations are ignored.
IN
STBY
The Model
236/237
is in standby.
The calibration command sent
over the
bus
will not be exe
cuted
(see
Note).
CAL COMPLI
Compliance has occurred during calibration. Check test
setup connections and instrument
settings.
CAL MODE
ERR
Common
mode calibration error.
Output of Model
236/237
is
not
shorted or unit
is defective.
The cal
constant from the
previous
calibration
will
be
used.
CAL VALUE ERR
Invalid calibration value
sent to
the Model
236/237.
This calibration step
is ignored
(not
at
tempted). Calibration constant from previous calibration will be used.
CAL ADC ZERO
Measure offset calibration error.
Calibration
is attempted
using
a
value that is not within ac
ceptable limits. The transmitted value is
ignored and a
default
cal constant
value is used in-
stead. Possible problems include; incorrect
cal
constant
value, defective
calibration equip
ment (or
connections),
or defective
Model
236/237.
CAL ADC
GAIN
Measure
gain calibration
error. Calibration is attempted using a
value that is not within ac
ceptable limits. The transmitted value is ignored and
a
default
cal constant value is used
in-
stead. Possible problems include; incorrect
cal
constant
value, defective
calibration equip
ment
(or
connections),
or defective Model 236/237.
CAL
SRC ZERO
Source offset
calibration error.
Calibration is attempted using a value
that is not within ac
ceptable limits. The transmitted value is ignored
and
a
default cal constant value is used
in-
stead. Possible problems include;
incorrect cal constant value, defective
calibration equip
ment
(or connections),
or
defective
Model
236/237.
CAL SRC GAIN
Source gain calibration error. Calibration is attempted
using a value that is not within
accept
ahle
limits. The transmitted value is ignored
and a default cal constant
value is used instead.
Possible problems include; incorrect
cal constant value, defective
calibration equipment
(or
_________________
connections), or defective Model 236/237.
Note: During the execution
ofa calibration step in which the Model 236/237 takes a
measurement conversion, it is
possible
the
instrument can
transition
from OPERATE
to
STANDBY.
This
can occur because it was
specifically programmed to do so,
or because the
test fixture safety
interlock
was opened.
In
this event, the OPERATE
to STANDBY transition
is detected and the
measurement conversion used to compute
the calibration constant
is
ignored. The front panel message
“IN STBY“ is
displayed when this occurs.
244

Keithley 236 Specifications

General

Brand	Keithley
Model	236
Category	Measuring Instruments
Language	English