Installation
To perform the deskew operation with an external source, follow these steps:
1.
Connect the probes to Ch1 and Ch2 on the oscilloscope.
2.
Connect an external source to the deskew fixture.
3.
Follow the instructions of the Probe Calibration and Deskew fixture
(Tektronix part number: 067-0405-xx) to make the connections.
4.
Set up the oscilloscope as follows:
Use the Horizontal Scale knob to set the oscilloscope to an acquisition
rate so that there are two or more samples on the deskew edge.
Use the Vertical Scale and Position knobs to adjust the signals to fill
the display without missing any part of the signals.
Set the Record Length so that there are more samples for the edges in
the acquisition. It is recommended that you set the record length to
25000 points.
5.
To start the application from a supported oscilloscope, select File> Run
Application> USB2.0 Test Package or Analyze> USB2.0 Test Package from
the menu bar of the oscilloscope.
6.
Select Utilities> Deskew.
7.
Set the channel Source in the From area to Ch1. The remaining channels are
deskewed to the Source waveform, which is the reference point.
8.
Set the channel Source in the To area to Ch2, the channel to be deskewed.
9.
Select the Reference Level for Ch1. The reference level is the percentage
level of the waveform from which to take the edges to deskew.
10.
Select the Reference Level in the To area for Ch2 and set the reference
value.
11.
Select the Hysteresis in the From area for Ch1. Hysteresis helps to ignore
the noise level in the waveform.
12.
Select the Hysteresis in the To area for Ch2 and set the hysteresis value.
13.
Select the Slope, Rise or Fall, on which to perform the deskew operation.
14.
Select the number of edges used for deskew.
15.
To start the deskew utility, select Utilities> Perform Deskew and confirm
the operation.
16.
Without changing the From: Ch1 channel, deskew the remaining channels.
TDSUSB2 Universal Serial Bus Measurement Package
15
17.
The setup is an acquisition of a square signal at 100 KHz, with the Record
length set to 25000 points to achieve the sample resolution of 1.6 ns.
Summary of Contents for TDSUSB2
Page 24: ...Getting Started 10 TDSUSB2 Universal Serial Bus Measurement Package...
Page 32: ...Installation 18 TDSUSB2 Universal Serial Bus Measurement Package...
Page 61: ...Operating Basics TDSUSB2 Universal Serial Bus Measurement Package 47...
Page 76: ...Taking Measurements 62 TDSUSB2 Universal Serial Bus Measurement Package...
Page 90: ...Tutorial 76 TDSUSB2 Universal Serial Bus Measurement Package...
Page 160: ...Application Examples 146 TDSUSB2 Universal Serial Bus Measurement Package...
Page 230: ...Measurement Algorithms 216 TDSUSB2 Universal Serial Bus Measurement Package...
Page 250: ...Glossary 236 TDSUSB2 Universal Serial Bus Measurement Package...
