Newtons4th PSM3750 NumetriQ, Startup Manual, Page: 72 / 104

PSM3750 Quick User Guide
Page 70
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 within the “SYSTEM”
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 measurements is limited to 5MHz. To
minimise noise there is a 100 kHz filter applied by default. To obtain the full
bandwidth press “ACQU” highlight bandwidth and select “wide” .