HP 8901B

4-4 Help
By specifying an offset frequency of zero, the Frequency Offset table can
also be accessed for measurements when an external
LO is not being
used. Simply key in
27.3 SPCL and then 0 MHz (the fOFS annunciator
will light in the display). The instrument is now ready to store the
calibration factors (up to
22) for the second Sensor Module in the
Frequency Offset table using the entry procedure shown in
Appendix B.
Once the cal factors have been stored, key in 27.0 SPCL when you wish to
exit the Frequency Offset Mode and use the first Sensor Module. To re-enter
the Frequency Offset Mode and use the second Sensor Module, key in
27.1 SPCL.
No Power Sensor
RF Level (uncalibrated)
To make an uncalibrated RF power measurement without a power
sensor, connect a
500 cable and Type-N connector from the HP 8901Bs
INPUT port to the output of your signal source. Press the
RF POWER
key. The HP 8901B will make an uncalibrated broadband power
measurement using its
RF Peak detector. (Note that the HP 8901B
lights the
SPCL key rather than the RF POWER key when it is using
the uncalibrated
RF Peak detector to measure power.) Although the
accuracy of this measurement is signrficantly lower than a calibrated
power measurement made using a power sensor, it can be useful as
a means of determining if there
is any input signal present at the
HP 8901Bs input.
If a Sensor Module is connected to the HP 8901B,
the
RF Peak detector can be selected by keying in 35.0 SPCL.
Tuned Level (uncalibrated)
To make an uncalibrated Tuned Level measurement (either with a Sensor
Module connected to the HP 8901B or with a BNC cable and Type-N
connector connected at the INPUT port) tune the
HP 8901B to the frequency
of the input signal and select
TUNED RF LEVEL. The Hp 8901B will make
an uncalibrated Peak Tuned Level measurement. Although the accuracy
of this measurement is sigxuficantly lower than a calibrated
RF Power
measurement, it can be useful for measuring input signals that are
drifting.
HP-/B
The HP 8901B enables you to fully automate your RF Power measurements.
Refer to your HP 8901B Operation and Calibration Manual for setup and
programming information.