Rohde & Schwarz FSMR series, Начало работы

Страница: 60 / 131

R&S FSMR Measurement Examples
1166.3311.12 2.9 E-2
The FSMR is now calibrated in one RF level range (the upper level
range does handle RF levels from -10 dBm to +30 dBm).
Measurements in this level range can now performed with full
accuracy.
Fig.2-6 Tuned RF Level measurement after calibration
2. Range to range calibration- relative calibration
Change the signal generator output level
The following settings are used on the generator:
Change the signal generator RF Level in 1 dB steps down.
Observe the FSMR screen for the yellow RECAL message to
appear (at levels about -10 dBm). This is the point where the
automated Range-to-Range calibration can be performed.
RF LEVEL
RECAL
(MANUAL)
The FSMR is now ready for a RF level range change. The
calibration of the level difference due to the range change will be
performed.
Press the
RF LEVEL hotkey.
The RF LEVEL menu is displayed.
In the RF LEVEL menu press the RECAL (MANUAL) softkey.
The RECAL procedure is performed. Do not change any signal
generator settings at this time.
A message box appears. The instrument will perform a
measurement in the calibrated range, then change the RF settings
(RF attenuator, IF gain) and then measure again. After the
recalibration measurements with high accuracy are available in the
RF level range 2 (covers levels from -10 dBm to -50 dBm).