Technical data

Connecting Instruments to USB 4
Agilent Connectivity Guide 83
USB Hardware Checks
This section gives guidelines to make hardware troubleshooting checks
for connected USB instruments. Start your troubleshooting sequence by
performing the following hardware checks. If performing the hardware
checks do not correct the problem, go to USB Software Checks.
Check Cable Connections/Damage Check all USB cables for
good connection to the USB connector on your PC, to all USB hubs (if
installed) and the USB cable connections to connected USB
instruments. An improperly attached USB connector can cause the
interface to malfunction.
Check all USB cables for cuts/damage and check for
bent/misaligned/crushed connector pins. Replace cables as required. If
these actions do not solve the problem, try disconnecting and
reconnecting (or replacing) USB cables. If the cable checks do not solve
the problem, go to Check PC/Instrument Functions.
Check PC/Instrument Functions Verify that all USB hubs, and all
connected USB instruments are functional and are powered ON. Verify
that host computer is not in a Suspended power management state. If
these actions do not solve the problem, reboot the PC. If this does not
solve the problem, go to Check Device Manager.
Check Device Manager You can use the Windows Device Manager
to reinstall the USB instrument driver, as required. For example, with
Windows XP, go to
Control Panel. Then, select System > Hardware >
Device Manager
. From Device Manager, select the USB Test and
Measurement Device
and then right click for Properties.
Tab to
Driver and click Reinstall Driver. This will allow the Windows
Plug and Play Manager to begin searching for a driver for the
instrument. Since Device Manager may have disabled the instrument,
click
Enable to restart the instrument.
NOTE
Windows may place a misbehaving USB device in an “Unknown
device” category. To see if this has happened, change the View in
Device
Manager
by selecting View > Show Hidden Devices. Next, right-click the
Universal Serial Bus Controllers Unknown device and select Uninstall.
Then, select
Device Manager > Action > Scan for hardware changes.