can momentarily (approx. one minute) read
2.2A before the fuse will blow. This
10%
over-
range will not harm the instrument.
3isplay
1.
Turn off the power and disconnect the power line and test
leads.
2. Place the end of a flat-blade screwdriver into the slot in the
fuse holder on the front panel. Press in slightly and rotate
the fuse carrier one quarter turn counterclockwise. Release
pressure and remove the fuse carrier and the fuse.
3. Remove the defective fuse and replace
it
with the following
type: 2A, 250v, 3AG, normal-blow (Keithley part number
FU-13)
or
equivalent.
Message
CAUTION
Use only the recommended fuse type. If a
fuse with a higher current rating is in-
stalled, instrument damage may occur.
of less than 80% up to
35°C.
For ambient above 35°C derate
humidity 3% per "C up to 50°C.
If
the instrument has been
subjected to extremes of temperature, allow sufficient time for
internal temperature
to
reach environmental conditions.
Typically,
it
takes one hour to stabilize a unit that is 10°C
(18°F) out of the specified temperature range.
2.6.2 Maximum Allowable Inputs
Table 2-2 lists the maximum allowable inputs for the Model
197.
2.6.3 Warm Up
The Model 197 requires one hour for warm
up
to achieve
rated accuracy.
2.5
ERROR MESSAGES
2.7 BASIC BENCH MEASUREMENTS
Table 2-1 lists the error messages associated with basic front
panel operation. Note that the instrument has
a
number of
other messages that are discussed in the appropirate sections
of the manual.
2.6 OPERATING CONDlTlONS
2.6.1 Environmental Conditions
All
measurements should be made at an ambient temperature
within the range of 0°C to 50°C, and with a relative humidity
--
I
LC
~
Err
~
Q11(
Invalid
D
Function
Basic measurement techniques for using the Model 197 to
measure AC and DC volts, resistance,
AC
and
DC
current
and
dB
are covered in the following paragraphs.
Also
includ-
ed is the operation of the minimum/maximum and
100
point
data logger.
WARNING
Before operating the Model
197,
observe all
previously mentioned safety precautions.
When testing high energy power circuits
follow the instructions found in paragraph
2.2.
Failure to observe these and other safe-
Table
2-1.
Error
Messages
Comments
Model 197 locks up. See Section
5
for troubleshooting information.
Model 197 locks up, but operation can be restored by pressing
any one of the four momentary pushbuttons. If restored,
calibration is invalid as indicated by the flashing "C" annunciator.
See Section
5
for troubleshooting information.
Overrange input applied to the Model 197. Leading minus sign
indicates that input signal has a negative value.
"AC" and
"Q"
annunciators flash. Correct problem by releasing
(out) AC/DC Dushbutton.
2-4
2-3
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