An allrounder, Test signals – as you like it – Atec Rohde-Schwarz-UPL User Manual

Page 4

Audio Analyzer UPL

An allrounder

Test signals – as you like it

The generators of UPL supply an
extremely wide variety of analog and –
with options UPL-B2 or UPL-B29 –
digital test signals:

• Sinewaves

for level and harmonic distortion
measurements. The signal can be
applied to an equalizer with user-
selectable nominal frequency re-
sponse, eg for compensating the
frequency response of the test as-
sembly

• Two-tone signal

for modulation distortion analysis.
Various amplitude ratios can be se-
lected and the frequencies are con-
tinuously adjustable

• Difference tone signal

for intermodulation measurements
with continuous setting of both fre-
quencies

• Multitone signal

comprising up to 17 sinewaves of
any frequency and with the same
or different amplitude; setting the
phase is also possible with UPL-B6

• Sine burst signal

with adjustable interval and on-
time as well as programmable low
level, eg for testing AGCs

• Sine

burst

also with adjustable interval and
on-time, eg for testing rms rectifier
circuits

• Special multitone signal

comprising up to 7400 frequencies
with selectable amplitude distribu-
tion. The frequency spacing can be
linked to the resolution used for the
fast Fourier transform, thus en-
abling rapid and precise single-
shot measurements of the frequen-
cy response of a DUT

• Noise

with a variety of probability distri-
butions, eg for acoustic measure-
ments; setting of crest factor with
UPL-B6

• Arbitrary waveforms

for generating any voltage curve
of up to 16k points. Test signals
can be output in different file for-
mats, eg voice and music signals
stored as WAV files

• Two-channel sinewave signals

for the two digital output channels
when UPL-B6 is used

• AM and FM

for sinewave signals

• DC

also with sweep function

Signals can be generated with an
offset. Moreover, digital audio signals
can be dithered with adjustable level
and selectable amplitude distribution.

Fig. 1: Automatic marking of harmonics in THD+N measure-
ments makes nonharmonics visible at a glance

Fig. 2: In THD measurements, single harmonics, all harmonics
or any combination of harmonics can be measured

Fig. 3: The waveform function displays the test signal in the
time domain. The example shows a sinewave burst

Fig. 4: The transient characteristics of an AGC play an impor-
tant role in testing hearing aids or automatic volume control on
tape recorders