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Model 8902A
Operation
A Second Cal-Factor Table for High-Frequency Measurements.
A
second table having u p t o 22 pairs of frequency/cal-factor pairs (plus a reference cal factor), is
available for use with a n external dow n-converter in the Frequency Offset mode. (Refer to
Frclqiicwcy
0 f l . S ~ ~ Cunlrol o n page 3-255 for more information about this mode.)
When measuring power levels at high frequencies using a high-frequency power sensor o r sensor
module (such as the H P 11792A43, enter the reference cal factor as an entry in the table at 50 MHz.
If this frequency/cal factor pair is not entered. the instrument will not measure power at frequencies
less than the lowest frequcacy entered in the cal factor table (2 GHz in the case o f the HP 11792A).
Storing of Calibration Factor Tables.
T h e Store/Recall function cannot store a cal-factor table. However, t o avoid re-entering tables when
frequent interchanging of power sensors is necessary. either use Manual Calibration Factors, o r use
the second table for the second power sensor. Select 27.3 SPCL and use
0
H z
as the external, Local
Oscillator (LO) value. (Refer t o Frcqiwm~y OfIk1 Conlrol o n page 3-255 for a procedure o n entering
an external LO value.)
These two Automatic Calibration Factor tables are retained in the instrument's non-volatile memory
for use in all subsequent I<F power measurements. Every time you use the second table, you must
enter the external LO value.
User-Built Sensor Module.
Any compatible power sensor can be configured as a sensor module using an external RF switch
wired t o the remote control connectors on the Measuring Receiver's rear panel. (Refer
to Rcvnoki
Control R F Swi1c.h o n page 3-133.)
Calibration Factor Resolution.
Calibration factors have a resolut.ion of 0.
If%.
HP-IB: Interaction Between Calibration
On
and Zero.
CO
aborts ZR, but when Z R is timed
out.
CI
is n o t aborted.
HP-IB: Using Save Cal.
When calibrating the Measuring Receiver over
HP-IS,
use T3 settling time c o d e between the
Calibrate and Save Cal codes. For example:
C
1
T3SC
Input/Output Status.
MODULATlON OUTPUT/AUDIO INPUT is disabled during R F power measurements.
Relative Measurements.
If R F power is t o be displayed relative to a reference. enter the value as a ratio reference using the
RATIO key. (Refer t o
Ra/io on
page 3-235.)
Frequency-Selective Level Measurements.
Use the Tuned R F Level function to make frequency-selective, absolute level measurements.
Source Impedance.
All measurement units assume a source impedance
of
5052.
3-83
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