Easy operation for level calibration over a wide level range
To perform measurements over the full level range of conventional RF generators, e.g. from –130 dBm to +10 dBm, it is necessary to switch theR&S®FSMR‘s built-in RF attenuator or the IF gain as required. The R&S®FSMR eliminates any level errors that may occur
as a result of range switching by calibrating the adjacent range prior to switchover. As a result, the user can benefit from the instrument‘s high linearity of 0.01 dB + 0.005 dB deviation per 10 dB across the entire level range. Level calibration is carried out in just a few steps. The complete setup, including the power meter connected to the measuring receiver, is operated via the R&S®FSMR front panel.
Step 1: Set the measurement frequency (manually or with
the AUTO TUNE function). The R&S®FSMR measurement
range is then automatically set to the level of the incoming
signal (AUTORANGE function)
Step 2: Perform a reference measurement with the power
meter by means of CAL ABS POWER. The R&S®FSMR is
now ready for level calibration, which is indicated by the
CAL field turning green
Step 3: Reduce the level of the device to be calibrated in
the required steps and verify the level. If the test signal is
outside the usable measurement range of the R&S®FSMR,
a prompt is issued to calibrate the adjacent
range
Step 4: Calibrate the adjacent range with the RECAL key.
The R&S®FSMR automatically switches the measurement
range
