Audio Switcher Multichannel switcher for audio channel inputs and outputs


As an add-on unit to the R&S®UPV and R&S®UPP audio analyzers, the R&S®UPZ audio switcher can be used whenever input or output signals need to be switched over to multiple channels or DUTs. Users can directly operate the switcher from the graphical user interface of the audio analyzer. Control via PC is also possible.


Key facts


  • Available as input and output switcher
  • Cascading of up to 128 channels
  • Operation directly from the R&S®UPV or R&S®UPP audio analyzers
  • Control via RS-232-C or USB 2.0 for handling universal applications


Available as input and output switcher


The R&S®UPZ audio switcher – like the R&S®UPV and R&S®UPP audio analyzers – comes with XLR connectors. Since there is a difference between male and female connectors in the XLR system, the R&S®UPZ is available both as an input and as an output model. Both models feature two switching channels, enabling users to simultaneously operate the two generator or measurement channels of the audio analyzer. Up to 16 input switchers plus 16 output switchers can be cascaded, allowing up to 128 input or output channels to be switched.


Applications for testing multichannel amplifiers


The standard application is paired or individual switching of the DUTs or measurement channels to be tested. In each case, one signal path is connected to an assigned channel. A special feature is measuring the crosstalk of the individual channels of multichannel amplifiers, which requires a particularly critical measurement. For this application, the signal coupled into a channel will be measured while all other amplifier channels are driven at the same time. The output switcher enables users to switch signal path B through to all channels in parallel, while signal path A can be switched to any selectable channel.



Electrical data


Nominal switching capacity 1)

resistive load

33 V (46.7 V Vp), 0.5 A

Max. switching power

resistive load

60 W

Max. switching current


2:00 a.m.

Crosstalk (balanced 600 Ω load) 2)

20 kHz

typ. –140 dB


100 kHz

typ. –126 dB

Series resistance

per signal pin

typ. <0.3 Ω

Shunt capacitance

each signal pin to ground


General data


Environmental conditions



operating temperature range

0 °C to +50 °C


storage temperature range

–40 °C to +70 °C



95 % relative humidity at 40 °C, constant, in linewith EN 60068-2-78

Power supply


nominal voltage

100 V to 120 V AC ± 10 %

220 V to 240 V AC ± 10 %


nominal frequency range

50 Hz to 60 Hz ± 5 %

Power consumption


input switcher

max. 10 VA


output switcher

max. 15 VA

Product conformity


Electromagnetic compatibility

in line with

applied harmonized standards:

EMC Directive 2004/108/EC

EN 61326-1 (for industrial use)


EN 61326-2-1


EN 55011 (Class B)


EN 61000-3-2


EN 61000-3-3

Electrical safety

in line with

applied harmonized standard:EN 61010-1

Low Voltage Directive 2006/95/EC



UL 61010-1



CAN/CSA-C22.2 No. 61010-1

International certification

VDE – Association for Electrical, Electronic and Information Technologies

GS mark 138469


CSA – Canadian Standards Association

CSAUS mark 1245063


W × H × D

427 mm × 43 mm × 350 mm, 1 HU(16.81 in × 1.69 in × 13.78 in)



3.7 kg

Remote Control


via RS-232-C or USB 2.0