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Operation
Model 8902A
Minimizing Mismatch Uncertainty.
The accuracy specifications for Option 050 do not include
mismatch uncertainty. A 10
dB
pad positioned at the HP 8902A's input and a 10
dB
pad at the
source's output can help minimize mismatch uncertainty. Also, using well shielded cables can help
reduce leakage.
USING SPECIAL FUNCTIONS 38 AND 39 TO DISPLAY AND ENTER TUNED RF LEVEL CALIBRA-
TION FACTORS
These functions are especially useful in remote operation when making repetitive Tuned RF Level
measurements at many different frequencies. After a measurement is calibrated, you can display the
calibration factors for that frequency using Special Function 38. These values can then be re-entered
using Special Fbnction 39. When operating the instrument remotely, measurement time is decreased
when it is not necessary to perform calibration. (Note: if the number of test frequencies is less than or
equal to eight, consider using the Store/Recall function.)
To display and then re-use mned RF Level calibration factors, perform calibration at the frequency
of interest; read the calibration factors using Special Function 38 (and record the values somewhere;
for example, in a test program).
Then re-enter the calibration factors using Special Function 39 before making measurements at that
frequency. (Before using Special F'unction 39
,
ensure that the instrument is tuned to the same frequency
as calibrated at before.)
Special Function 38; Display Tuned RF Level Calibration Factors.
38.1 Display the calibration factor for Range
#1.
38.2 Display the calibration factor for Range #2.
38.3 Display the calibration factor for Range #3.
38.45 Display the
SET
REF reference calibration value. (This value is displayed with a maximum of
eight digits and a resolution of 0.01%.)
To display Tuned
RF Level calibration factors:
a. Select the TUNED RF LEVEL mode.
b. Perform calibration for either absolute of relative mned RF Level measurements as
described in the previous paragraphs.
c. Select 38.N
SPCL
(where N is the desired suffix)
d. Select
%
CAL FACTOR (Blue Key, MHz).
e. Record the displayed value.
This special function is not available with firmware date codes 234.1985 and below
(To
display the firmware date code, select
42.0
SPCL.) T o
order a
ROM
set that contains this special function, contact the nearest HP sales office.
3-100
rev.25AUG87
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