SFRA45 User Manual
11-3
The measurements are computed over rectangular
windows with no gaps. The processing power of the DSP
allows the measurements to be made in real time without
missing any samples. In this way, the measured rms is a
true value even if the signal is fluctuating. The only
occasion when data is missed is when an autozero
measurement is requested – this can be disabled in the
SYSTEM OPTIONS menu if required.
The ZOOM function can be used to select any combination
of up to four parameters from the display.
Note that the wideband nature of true rms measurements
prevents the use of heterodyning so the frequency range
of the measurement is limited to 5MHz. To minimise noise,
there is a 50kHz filter applied by default. To obtain the full
bandwidth press ACQU, highlight bandwidth and select
“wide”.
