Model 8901B Operation
A
Second Cal-Factor Table
for
High-Frequency Measurements
A second table having up
to
22 pairs of frequency/cal-factor pairs (plus a reference
cal
factor),
is
available for use with an external down-converter in the Frequency Offset mode. (Refer
to
Bequency
Ofset
Control
on page 3-225 for more information about this mode.)
When measuring power levels at high frequencies using a high-frequency power sensor
or
sensor module
(such
as
the HP 11792A), 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 frequency entered in the cal factor table
(2
GHz
in
the case of the HP 11792A).
Storing
of
Calibration Factor Tables
The Store/Recall function cannot store a cal-factor table. However,
to
avoid re-entering tables when
frequent interchanging of power sensors
is
necessary, either use Manual Calibration Factors,
or
use
the second table for the second power sensor. Select 27.3
SPCL
and
use
0
Hz
as
the external, Local
Oscillator
(LO)
value. (Refer to
frequency
Ofset Control
on
page
3-225
for a procedure on 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 RF 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
to the remote control connectors on the Modulation Analyzer’s rear panel. (Refer to
Remote
Control
RF
Switch
on page 3-107.)
Calibration Factor Resolution
Calibration factors have
a
resolution of 0.1%.
HP-IB:
Interaction Between Calibration On and Zero
CO
aborts
ZR,
but when ZR
is
timed out, C1
is
not aborted.
HP-IB: Using Save Cal
When calibrating the Modulatian Analyzer over HP-IB, use
T3
settling time code between the Calibrate
and Save Cal codes.
For
example:
ClT3SC
Inputloutput Status
MODULATION OUTPUT/AUDIO INPUT
is
disabled during RF power measurements.
Relative Measurements
If
RF
power
is
to be displayed relative to a reference, enter the value as a ratio reference using the
RATIO key. (Refer to
Ratio
on page 3-215.)
Source Impedance
All measurement units assume
a
source impedance
of
50a.
RF
Power 3-79
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