HP 8340B Manual page 197

NOTE:
Instrument calibration constants
tell the program whether an attenuator
is
installed.
If
an
attenuator was
installed after time of
manufacture,
calibration constant #59 should have been
changed
to reflect the addition.
If
this cal constant was not updated,
the
program
tells you that no
attenuator exists, though one is actually installed. To update the cal
constants
to reflect the correct
option configuration, return to the test menu and select the [Utility] softkey. Refer to
utility
8-20 and
select the
[Chg Option] softkey.
Problem Solver
If
you
run
into difficulties during this test (due
to an incorrect test setup,
etc.), and the softkey menu
gives you no
ABORT selection, press [Carry On] or other continue command
until
you
reach
a menu
that
lets
you abort the test. Do not do
a
full
program break.
If
you
break the
program, some
cal
constants may already have
been altered in the instrument.
A controlled abort lets the program
replace the instrument's
original cal constants before exiting the test.
A
hard
STOP does not do
this,
and when you run the program again, the program indicates:
DUT
CAL #AT10
OFFSET
=
### BUT
FILE
=
###
[OUT OK]
[NEITHER] [FILE OK]
This screen
tells you that
a
cal
constant
difference exists between the data disc image
file and the
instrument.
It then lets you choose which is the correct cal constant. In this
case,
the
image
file is
correct. For
each cal constant discrepancy
(sequentially) displayed, press [FILE OK].
After several cal
constant discrepancies are displayed, the program returns to normal operation.
NOTE: The program repeats the Set IF attenuator statement for each measurement, even though
the
proper attenuation is
set.
Procedure
1.
Select the desired softkey and respond to the program prompts:
[ADJUST] does
everything.
It
adjusts the calibration constants, verifies
power accuracy
at
every
attenuator
step,
and sums the attenuator performance data with the output
power accuracy data,
comparing the
results to instrument
specifications.
After you select this
key,
select
[ALL]
to adjust and measure
all
attenuator steps.
If
you select only
one step, no data is
stored.
If
you
wish
to
calibrate the attenuator
first, and
then measure the
low output power accuracy
performance, select [ADJUST].
[MEASURE]
is
a
subset of the
ADJUST
test.
MEASURE
verifies the low output power accuracy at
every attenuator step, and sums the attenuator performance data with the output
power accuracy
data, comparing the results to instrument specifications.
After you select this key,
press
[ALL]
to
measure
all
the attenuator steps and store the data.
If
you
select only
one step, no
data
is
stored.
Select the
MEASURE
softkey
if
you
only wish to verify the low output
power accuracy perfor¬
mance.
[SPEC]
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
8-10
Tests/Utilities Attenuator Calibration and Operation Verification Test Software