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Agilent Technologies J-BERT N4903A Getting Started

High-performance serial bert
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Getting Started
with the
Agilent
J-BERT N4903A
High-Performance
You only need a few minutes to get started
with the J-BERT.
This Getting Started Brochure helps you to
quickly understand the operating principles
and set up your first BER test.
If you need more detailed information on
the J-BERT, check out the Online Help.
The Help also offers printable versions of the
User Guide and the Programming Guide.
Serial BERT

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Summary of Contents for Agilent Technologies J-BERT N4903A

  • Page 1 Getting Started with the Agilent J-BERT N4903A High-Performance Serial BERT You only need a few minutes to get started with the J-BERT. This Getting Started Brochure helps you to quickly understand the operating principles and set up your first BER test.

  • Page 2: Safety Summary

    Manual Part Number and intended use of the instrument. N4903-91010 Printed in Germany Agilent Technologies Inc. assumes no liability for Agilent Technologies, Deutschland GmbH the customer's failure to comply with these Herrenberger Str. 130 requirements.
  • Page 3 Li st Co nt en ts Bo x Co nt en ts Li st Co Agilent J-BERT N4903A nt en ts Bo x Co nt en ts Li st Co please refer to the Box Contents List. nt en ts...
  • Page 4 Operating the Agilent J-BERT Now that the instrument is running, let’s take a look at its front panel elements: Instrument Setup Controls Accumulation Controls Keypad and Front Panel Knob PG Connectors Power Switch and Earth Terminal Preset Local PG Controls ED Controls ED Connectors The Agilent J-BERT is available in different versions.

  • Page 5: Changing Parameters

    Operating the Agilent J-BERT Changing Parameters With the touchscreen, your finger is the mouse. Tipping an item with your finger is like clicking it with the mouse. You can use the numeric keypad to enter values by hand, or the large knob to adjust values. You can also use the knobs at the bottom of the instrument to change certain frequently used values in run-time.

  • Page 6: Preparing The Test

    Preparing the Test What Are We Testing? The quickest way to familiarize yourself with the instrument is to set up a short test. You can test the BER on a cable. All you need for this test is an APC/RPC cable for the data port connection and an APC/RPC-SMA adapter cable to connect the PG clock output to the ED clock input.

  • Page 7: Setting Up The Instrument

    Setting Up the Instrument Set the Bit Rate Now we want to set the pattern generator's bit rate. For now, we will use the instrument's internal clock: Switch to the Bit Rate Setup. Keep the Internal Clock Source. Select the Pattern Select 1.06250 Gb/s Now select the data pattern...

  • Page 8: Setting Up The Error Detector

    Setting up the Instrument Setting up the Error Detector The next step is to set up the error detector’s inputs. Press the PG/ED Setup button twice to switch to the error detector setup. Click the Edit button. Set the Input to Normal This means, we need only one cable that will be connected...
  • Page 9 Setting Up the Instrument Synchronizing the Pattern Now make sure that the error detector automatically syncs to the data pattern: Open the Pattern Sync Setup dialog box. Make sure that Normal Sync Mode Automatic Sync With this setting, the error detector starts are selected.
  • Page 10 Modifying the Test Setup Adjusting the Sampling Point You can adjust the sampling point manually, for example, to test the performance of your DUT closer to the edge of the eye: Decision Threshold Use the knob to move the sampling Use the Data In Delay point vertically.

  • Page 11: Inserting Errors

    Modifying the Test Setup Inserting Errors You can add a single bit error to the data stream by pressing Error Add button. The pattern generator can also be set up to insert a specified BER in the data stream. This can, for example, be used for testing error correction algorithms.

  • Page 12: Installing Hardware Options

    Installing Hardware Options Installing the J20 Option To install the J20 Interference Channel: Perform the regular shutdown procedure provided by the operating system. Disconnect the instrument from mains. Caution Never plug in or remove a module while the instrument is connected to mains power.

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