Tektronix DPO2304SX, Printable Help

Page: 235 / 920

Error detector setups
Use the serial error detector
From the Analyze menu, select Serial Error Detector. Error detector is not available on DPO70000SX instruments.
Overview
The Serial Error Detector requires option ERRDT. The oscilloscope Error Detector conducts Bit, Frame, Symbol, and Character
tests much like a BERT. It has the advantage that it not only counts the errors and computes the error rates, but it also shows
you where the error occurs in the signal and it allows you to connect probes to other channels to debug the source of the errors,
such as crosstalk.
The Error Detector is often used in conjunction with TekExpress software applications to conduct receiver and margin testing.
The Error Detector has built-in preset setups that cover the most common use cases. These can be modified and saved as
custom setup files for later recall. Sample arbitrary waveform generator (AWG) setup files are included for various SATA Gen3
and USB3 signals. These files make it easy to verify correct operation of the Error Detector, and may be used to test a device-
under-test (DUT).
To use
■
Select Analyze > Serial Error Detector to display the Error Detector control window.
■
Select a setup from the Preset Setting drop-down list and press Apply.
■
Press the Sync button and wait for a status of Not Counting (about 6 seconds). Depending on the signal quality, you may
need to press the Sync button more than once.
Sync gets the oscilloscope synchronized to the signal.
A status of No Signal indicates that the oscilloscope cannot detect the signal. You may need to turn on the output of the
signal generator or AWG. A status of No Sync may arise for Bit tests that require a known pattern length, sync pattern, or
alignment character.
■
Press the Learn button, if visible. Learn only applies to some Bit Error Tests. Frame, Symbol, and Character tests do not
require the learn operation. Learn discovers the repeating pattern in the signal and stores it into system memory for
comparison to the signal to determine errors in the signal. Once a signal is in memory, it remains there until the next Learn
operation, so you do not have to use the Learn button every time you start testing for errors.
DPO70000SX, MSO/DPO70000DX, MSO/DPO70000C, DPO7000C, and MSO/DPO5000B Series 203