Technical data

Preparing to Take Measurements 2
Notes on USB Electrical Compliance Testing 25
Setting Up the Equipment
Infiniium 5485xA, 9000A, 80000 and 90000A Series Digital Sampling
Oscilloscope
1 Connect keyboard and mouse to oscilloscope.
2 Connect optional computer monitor to the VGA connector on the rear
nearest the right side of the instrument.
Differential Connection
3 Attach the Agilent 113xA differential probe to Channel 1 of the
oscilloscope.
a Attach the socketed probe head to the differential probe amp.
b Attach the header adapter to the socketed probe head (Figure 1).
This step is only needed if you are using the old test fixtures
(E2645- 66504, E2645- 66505, E2645- 66506, E2645- 66507,
E2645- 66508). If you are using the new test fixtures (E2649- 66401,
E2649- 66402, E2649- 66403, E2649- 66404, E2649- 66405), you do not
need to use a header adapter and can work with a socketed probe
head.
c Handle the socketed probe head and header adapter carefully.
d For durability, epoxy can be used to strengthen the assembly. Only
apply epoxy to back (noncomponent) side of probe head.
Figure 1 Differential Probe Setup