Atec Rohde-Schwarz-UPV - Manual (Page 21)

Version 03.00, August 2011
Rohde & Schwarz R&S ® UPV Audio Analyzer 21
Analog notch filter for measurements on signals with high
S/N ratio, this filter improves the dynamic
range of the analyzer by up to 30 dB to
140 dB for an analyzer bandwidth of
22/40/80 kHz, or 120 dB for an analyzer
bandwidth of 250 kHz (typical noise floor
of FFT); the filter is also used for
measuring THD, THD+N and MOD DIST
with dynamic mode precision
RMS (wideband)
RMS (selective)
quasi-peak Characteristics available in dual channel analog analyzer
with measurement functions
FFT analysis
Frequency range center frequency (f
c
) 10 Hz to 110 kHz
automatic to input signal
coupled to generator
Frequency tuning
fixed through entered value
Stopband f
c
± 0.5 % typ. > 30 dB
at 0.77 × f
c
and 1.3 × f
c
typ. –3 dB Passband
outside 0.5 × f
c
to 2 × f
c
typ. +0 dB/–1 dB
Sweep
Generator sweep
Parameters
frequency, level, with bursts also interval
and duration, one- or two-dimensional
Sweep linear, logarithmic, single, continuous
automatic after end of measurement
Stepping
time delay (fixed or loaded table)
Sweep speed
GEN TRACK 1.0 s
AUTO FAST 1.2 s
Two-channel RMS measurement 20 Hz to
20 kHz, 30-point generator sweep
logarithmic (frequency measurement
switched off, Low Dist OFF)
AUTO 2.0 s
Display of results
Units
Level (analog)
V, dBu, dBV, W, dBm, difference ( Δ),
deviation ( Δ%) and ratio (without
dimension, %, dBr) to reference value
Level (digital) FS, %FS, dBFS, LSBs,
deviation (
Δ%) or ratio (dBr)
to reference value
Distortion % or dB, referenced to signal amplitude,
THD and THD+N in all available level units
(absolute or relative to selectable
reference value)
Frequency Hz, difference ( Δ), deviation (Δ%) and ratio
(as quotient f/f
ref
, 1/3 octave,
octave or decade) to reference value
(entered or stored, current generator
frequency)
Phase °, rad, difference (Δ) to reference value
(entered or stored)
Reference value (level) fixed value (entered or stored)