HP 8340B Manual page 182

Chapter 6.
Running the Cal Utility
INTRODUCTION
The cal utility portion of the
software assists
you
in
generating
a
calibration data
file
for your specific
HP 355D
step attenuator and HP
8485A power
sensor. As mentioned
in
section
4,
several tests
require the data
stored
in
these
data
files before the they can run. The data
files you
generate are
stored and accessed on the storage media whose address is
defined by
Manager_sys$
and Msus$
(discussed
in
section 3). In
unmodified software, the storage media address
is
":,700,0".
Before running the
cal utility,
obtain the calibration data for your attenuator and power sensor.
When
the utility completes, the data you entered
is
stored on disc
1.
The
only time you
need to re-run the cal
utility
is when the attenuator or power sensor
is re-calibrated, or
if
you use a
device for which you have
not yet entered the data.
RUNNING THE CAL UTILITY
To
run
the Cal
Utility:
1.
Select the softkey [Cal Utility].
You are given
a
choice of entering the attenuator's calibration data ([IF
Attenuator]
softkey), or
the power sensor's calibration data
([Pwr Sensor Cal]
softkey).
The
softkey [Exit] returns
you to
the
8340 FAMILY TEST SYSTEM menu.
2.
Make your selection and proceed to the appropriate entry paragraph below.
ENTERING THE IF ATTENUATOR
(HP
355D) CALIBRATION DATA
1.
Select the softkey
[IF
Attenuator].
A softkey menu that gives you
the options of
[Start], [Display],
and [Return]
is displayed.
[Start]
begins entry
of the calibration data.
[Return] returns to the
CALIBRATION UTILITY menu.
[Display] shows the calibration data stored in
an IF
attenuator data
file.
2.
When
you select [Start], the program requests the attenuator serial number, and the actual value
of attenuation for the
10 dB through 70 dB
steps (at
a
1
MHz calibration frequency).
When you enter the attenuator
step values,
enter the actual value
(i.e.,
if
the
10
db step
is
10.02,
enter 10.02). Also, enter positive values.
3.
After you enter
all the data, you have the opportunity to
make
corrections,
if
necessary.
4.
Answer the
rest
of the questions supplied in
the program and select [Return] to
return
to the
CALIBRATION UTILITY menu.
Attenuator Calibration and Operation Verification Test Software
Running the Cal Utility 6-1