Technical data

Preparing to Take Measurements 2
Notes on USB Electrical Compliance Testing 23
E2649B USB 2.0 High-Speed Fixture Set
The E2649B high- speed fixture set includes five test fixtures. In the test
procedures, separate instructions may be provided based on the version of
the fixture that is being used. Fixture versions are identified by a part
number, which are shown in the following table and marked on the
fixture.
NOTE
The fixture part numbers are provided for identification purposes only and cannot be used
for ordering.
Ta b l e 6 Five E2649B Fixtures with Identification Numbers and Applicable Tests
TESTS
Test Fixture Description
New Part
Number
Old Part
Number
Host
Hi-Speed
Hub
Hi-Speed
Device
Hi-Speed
Low/Full
Speed
Device High Speed Signal Quality Test
Fixture
E2649-66401E2645-66507111n/a
Host High Speed Signal Quality Test
Fixture
E2649-66402 E2645-66508 1 1 n/a n/a
Receiver Sensitivity Test Fixture E2649-66403 E2645-66503 n/a 1 1 n/a
Host Disconnect Test Fixture E2649-66404 E2645-66506 1 n/a n/a n/a
Droop/Drop Test Fixture E2649-66405 n/a n/a n/a n/a 1
Table 7 Miscellaneous Equipment for use with Test Fixtures
TESTS
Equipment Required
Host
Hi-Speed
Hub
Hi-Speed
Device
Hi-Speed
Low/Full
Speed
5V test fixture power supply, Agilent P/N 0950-2546 or equivalent 111n/a
E2646A/B SQiDD board, included in the USB test option. n/a n/a n/a
1
*
100 mA load board (see the schematic in Figure 4 on page 177) 1
500 mA load board (see the schematic in Figure 5 on page 177) 1
* A second SQiDD board is recommended for droop/drop testing (if you are not using the Droop/Drop fixture); additional
SQiDD boards can be ordered as Agilent E2646B.