R&S NRP-Z91 PC control
1168.8579.12 1.9 E-6
Troubleshooting
A frequent problem, especially in the case of operation under Microsoft Windows XP, is that the
R&S NRP-Z5 fails to respond after a power sensor connected to the R&S NRP-Z5 is disconnected and
reconnected. It is then necessary to restart the PC.
This problem is not specific to the R&S NRP-Z5, but occurs with all USB hubs. You can try to eliminate
the problem by switching off the Selective Suspend for the USB port of the PC on which the R&S NRP-
Z5 is operated. The following step-by-step description is based on an English version of Windows XP:
1. Connect the R&S NRP-Z5 and put it into operation. Connect at least one power sensor.
2. Start the Device Manager and change the view by selecting View - Devices by connection (Fig.
1-9).
Fig. 1-9 Changing the view in Device Manager
3. Now identify the USB root hub on which the R&S NRP-Z5 is operated. To do so, expand the
hierarchical display of the PC components, as shown in Fig. 1-10. Under PCI bus, find the USB
host controller to whose root hub the R&S NRP-Z5 is connected. The R&S NRP-Z5 is shown as the
Generic USB Hub. It can be distinguished from other USB hubs by the power sensor connected to
it.
Fig. 1-10 Identification of USB root hub on which R&S NRP-Z5 is operated
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