Atec Rohde-Schwarz-UPL - Manual (Page 5)

Audio Analyzer UPL 5
Versatile test functions
UPL offers a wealth of measurement
functions both for analog and – with
option UPL-B2/-B29 – for digital inter-
faces.
• Level or S/N
with rms, peak or quasi-peak
weighting;
high measurement speeds due to
automatic adaptation of integra-
tion times to input signal
• Selective level
The center frequency of the band-
pass filter can be swept or coupled
to the generator frequency, to the
frequencies of a multitone signal (eg
for fast frequency response mea-
surements) or to the input signal
• SINAD or THD+N
The sum of all harmonics and noise
is measured (Fig. 1)
• Total harmonic distortion (THD)
Individual harmonics, all the har-
monics or any combination of har-
monics can be measured (Fig. 2)
• Modulation distortion
to DIN-IEC 268-3. 2nd and 3rd or-
der intermodulation is measured
• Intermodulation
using the difference tone method.
2nd and 3rd order intermodulation
is measured
• Wow and flutter
to DIN IEC, NAB, JIS or the
2-sigma method to DIN IEC where
the demodulated-signal spectrum is
also displayed
• DC voltage
• Frequency, phase and group delay
• Polarity
Signal paths are checked for
reversed polarity
• Crosstalk
• Waveform function
for representing the test signal in the
time domain (Fig. 3). Waveforms
can be smoothed by interpolation.
Slow sequences can be displayed
compressed, eg for analyzing the
transient response of compander or
AGC circuits (Fig. 4)
• Extended Analysis Functions
UPL-B6:
coherence and transfer functions
for determining the transfer charac-
teristics of complex test signals;
third octave analysis mainly for
acoustic measurements;
rub & buzz measurements in loud-
speaker production
Tests on hi-fi components call for increasingly complex measurement techniques. Results
obtained in the test lab must be verified in production, where as a rule not the whole range
of test functions is needed but economical solutions to cater for large batches. UPL is an
ideal choice for this task. It optimally complements its “bigger brother“, Audio Analyzer
UPD, which is mainly employed in development. The operating concept of the two units
based on the same IEC/IEEE-bus commands is identical, so there is no problem using them
jointly