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Getting Started
R&S
®
UPV
80
Getting Started 1146.2078.62 ─ 09
Possible Damage or Destruction of Input Circuits
The generator of the audio analyzer can generate analog output voltages with an RMS
of up to 20 V. These levels can damage or even destroy sensitive input circuits.
There is an option in the "Generator Config" panel for limiting the analog output volt-
age. For measurements on sensitive circuits, it is advisable to set an appropriately low
value in the "Max Voltage" field; this value then applies to all analog output signals,
irrespective of the signal shape.
The maximum voltage is not exceeded even in the case of changes made using the
rotary knob. For the setting of such value entries or the changes via the rotary knob,
see
chapter 3.3.7, "Function Selection and Value Entry"
The pulse level of the digital audio signals can be up to 8.5 V. Although the risk of
destruction is generally much smaller than for analog circuits, care must still be taken
when making settings for activating digital circuits.
3.2.2 Rapid Deactivation of Outputs
The OUTPUT OFF key can be used in the event of faults to deactivate all outputs of
the R&S UPV. The key affects all audio outputs, i.e. for both analog and digital audio
signals.
The deactivated lines can only be reactivated by pressing the OUTPUT OFF key
again.
The status of the key is indicated by an LED. Illumination of the LED means OUTPUT
OFF.
For more information about this key, see
chapter 4.13, "Rapid Deactivation of Out-
3.2.3 Avoiding Hum Loops
It is generally known in audio engineering that analog circuits must always be set up in
such a way that hum signal pick-up is avoided. For this reason, it is important that a
ground connection (grounding contact) be provided at only one point in the entire cir-
cuit.
Both the generator and the analyzer are configured as floating devices in order to pre-
vent an additional, inadvertent ground connection via the audio analyzer. The two
Important Information for Measurements