Rohde & Schwarz R&S UPP, User Manual

Page: 408 / 938

Instrument Functions
R&S
®
UPP
392 User Manual 1411.1055.32 ─ 10
"THD+N" The total distortion – broadband noise and harmonic – is measured
relative to the total RMS value.
 
TotalRMS
U U U
dB U
Noise d d
N THD
2 2
3
2
2
...
log 20
  
 

The total RMS value is band-limited to Frq Lim Upp.
The measured value can be displayed in % as well as in dB.
"SINAD" Measurement method similar to THD+N, but the result is displayed as
a
positive dB value, i.e. the total RMS value is relative to the residual
signal (overall spectrum without fundamental).
 
2 2
3
2
2
...
log 20
Noise d d
SINAD
U U U
TotalRMS
dB U
  
 
The total RMS value is band-limited to Frq Lim Upp.
"Noise" The noise factor – broadband noise without harmonics – is mea-
sured relative to the total RMS value.
 
TotalRMS
U
dB U
Noise
Noise
2
log 20
 
The total RMS value is band-limited to Frq Lim Upp.
The measured value can be displayed in % as well as in dB.
"Level THD+N" The total distortion voltage – consisting of broadband noise and the
harmonic – is measured.
 
2 2
3
2
2
...
Noise d d N THD
U U U V U
   

The measured value is displayed in voltage units (volts or FS).
"Level Noise" The noise voltage (broadband noise without the harmonics) is mea-
sured.
The measured value is displayed in voltage units (volts or FS).
Remote command:
SENSe[1]:FUNCtion:MMODe
on page 753
Rejection
Used to select the fundamental rejection.
"Narrow" The fundamental is suppressed extremely narrowly. As a result, it is
also possible to detect noise components which are immediately next
to the carrier.
"Wide" A digital notch filter with properties like those previously common in
analog measuring instruments is used to suppress the fundamental.
The broader filtering range produces slightly better measured values
since noise components close to the carrier are also suppressed.
Recommended if the measurement results are to be comparable to
those of analog measuring instruments.
Distortion Measurements