HP 8340B Manual page 155

1
The softkeys provided for
this
test are as follows:
ADJUST
MEASURE
SPEC
Viewdat
Hardcpy
JANITOR
-
Does everything-
It
adjusts the Calibration Constants; verifies
power
accuracy at every attenuator step;
it
also sums the attenuator perfor¬
mance data with the output power accuracy data and
compares
the
results to instrument specifications After this
key
is selected, press
the ALL softkey to adjust and measure
all of the attenuator steps.
If
only one step is
selected, no data will be stored
-
This
is a
subset of
the
ADJUST
test.
MEASURE
verifies the low
output power accuracy
at
every attenuator step;
it
also sums
the
attenuator performance data
with the output
power accuracy data
and compares the results to instrument specifications. After
this key
is
selected, press the
ALL softkey
to measure
all the
attenuator
steps and store the
data.
If
only one step
is
selected, no data will be
stored
-
This
is a
subset of the
above
tests.
SPEC
simply takes
existing
attenuator performance data and sums it
with
output power
accuracy data The
result
is
compared to instrument specifications
-
Allows you to view the test result data on the
computer's CRT,
After
this key is
pressed, you are given a
choice of viewing the Individual
attenuator step data or viewing
all
the
data.
-
Same
as the
Viewdata softkey except
the
selected data
is
output to
the printer
-
Returns you
to the test
menu-
Select the
desired softkey and respond
to the
prompts
provided by the program-
NOTE
The test setup
for the Adjust and Measure portions of the RF
Attenuator
Calibration is
extremely
critical. The tests and adjustments are
per¬
formed at
low RF output
power levels (down to
—90 dBm). Use of
a
defective cable
or adapter,
or having a loose cable connection in
the test
setup may cause a
misadjustment of the Instrument or failure in the low
output power accuracy test.
If
the test results indicate that the
instru¬
ment failed
low output power accuracy,
check the
test setup and re-run
the
selected test (either Adjust
or
Measure).
NOTE
The program will
repeat the "Set IF
attenuator" statement for each
mea¬
surement, even though the proper
attenuation has already been set.
HP 8340A/B and HP 8341A/B RF Attenuator Calibration