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Agilent Technologies N4962A User Manual

Serial bert 12.5 gb/s
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Agilent N4962A
Serial BERT 12.5 Gb/s
User Guide

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Summary of Contents for Agilent Technologies N4962A

  • Page 1 Agilent N4962A Serial BERT 12.5 Gb/s User Guide...

  • Page 2: Safety Notices

    Agilent shall not be liable for or loss of important data. Do not errors or for incidental or consequential proceed beyond a CAUTION notice until...

  • Page 3: Safety Summary

    Alternately, an externally installed switch or circuit breaker which is readily identifiable and is easily reached by the Agilent Technologies Inc. assumes no Environment Conditions operator may be used as a disconnecting liability for the customer's failure to comply device.
  • Page 4 Symbols on Instruments Indicates warning or caution. If you see this ISM 1-A symbol on a product, you must refer to the The Korean Certification (KC) mark is required for This text denotes the instrument is an Industrial manuals for specific Warning or Caution products that are subject to legally compulsory Scientific and Medical Group 1 Class A product.
  • Page 5 WEEE Directive Annexure I, this product is classed as a “Monitoring and Control instrumentation” product. Do not dispose in domestic household waste. To return unwanted products, contact your local Agilent office, or see www.agilent.com/environment/product/ for more information.

  • Page 7: Table Of Contents

    Contents Contents Getting Started ......................9 General ......................9 N4962A Operation Overview ............... 11 Getting Started with the N4962A Serial BERT 12.5 Gb/s ...... 12 1.3.1 Unpacking and Installation ............12 1.3.2 Safety and Regulatory..............12 1.3.3 Declaration of Conformity ............. 13 1.3.4...
  • Page 8 N4962A Device Commands ................. 66 5.5.1 Internal Clock Commands ............. 67 5.5.2 PRBS Pattern Commands ............. 70 5.5.3 Measurment Commands ............... 74 Examples ......................83 Returning the N4962A Serial BERT to Agilent Technologies ......87 Serial BERT 12.5 Gb/s User Guide...

  • Page 9: Getting Started

    Getting Started 1 Getting Started 1.1 General The N4962A serial BERT 12.5 Gb/s operates from 500 Mb/s – 12.5 Gb/s referencing an external clock, and from 9.85 – 11.35 Gb/s with the programmable internal clock. The N4962A includes: Internal clock system •...
  • Page 10 Getting Started Automatic sampling point adjustment Error detector • Elapsed time BER measurements • Manual threshold adjustment) • Disabled ('safe mode': no output) Operating modes • Enabled (PRBS output enabled) • Thru (no detector; inputs connected to Data Thru connectors on back •...

  • Page 11: N4962A Operation Overview

    Figure 1. Eye waveform The N4962A generates a continuous bit pattern that is applied to the DUT then fed back into the error detector. The input is automatically synchronized and compared with the original bit stream. The bit error rate is calculated by comparing the number of bit errors to the total number of bits transmitted.

  • Page 12: Getting Started With The N4962A Serial Bert 12.5 Gb/S

    1.3 Getting Started with the N4962A Serial BERT 12.5 Gb/s 1.3.1 Unpacking and Installation The N4962A serial BERT 12.5 Gb/s is shipped with all the accessories required for the self-test mode and verification. The contents includes: N4962A serial BERT 12.5 Gb/s •...

  • Page 13: Declaration Of Conformity

    Getting Started Do not remove instrument covers. There are no user serviceable parts within. Operation of the instrument in a manner not specified by Agilent Technologies may result in personal injury or loss of life. For continued protection against fire hazard, replace fuses, and or circuit breakers only with same type and ratings.

  • Page 14: Performance Recommendations

    • Terminate all unused RF connectors with 50 Ω terminations • 1.4 Connect the Hardware Connect power cord to adaptor to N4962A; plug in the power cord • Connect TX CKO to TX CKI with included coaxial cable • Connect RX CKO to RX CKI with included coaxial cable •...

  • Page 15: Turn It On

    Getting Started 1.5 Turn It On Turn on the power switch from the back panel • Press the Data Path > Select Path button and select Enabled • o This will turn on the PRBS output; when Disabled is selected, the instrument is in a 'safe mode' and no output is generated Press the Display >...
  • Page 16 Getting Started Serial BERT 12.5 Gb/s User Guide...

  • Page 17: N4962A System Overview

    Error detector (RX) with electronic clock phase adjustment • The N4962A is controlled by front-panel buttons and remote GPIB (IEEE 488.2) commands; information is conveyed with LED indicators and a display on the front panel, along with GPIB data communication.
  • Page 18 The system settings can be set by the local push-button interface or remote GPIB (IEEE 488.2) interface. All settings can be accessed through the menu system or through GPIB commands. The N4962A is compatible with the N4980A multi-instrument BERT software which is available through Agilent Technologies to help speed up programming time.

  • Page 19: Front Panel Quick Reference

    N4962A System Overview 2.1 Front Panel Quick Reference Figure 3. N4962A front panel Connectors RECEIVER: IN, IN ¯¯ (SMA) – input to error detector (differential or single-ended) SOURCE: OUT, OUT ¯¯¯ (2.92 mm K) – PRBS generator output (differential or...
  • Page 20 N4962A System Overview Controls Local (button & light) – indicates local (vs. remote) control; button selects local control Receiver > On (button & light) – indicates detector state; button toggles & resets BER Data Path > PRBS ¯¯¯¯ (button & light) – indicates inversion of PRBS signal; button toggles Select Path (button &...
  • Page 21 N4962A System Overview Table 1. Configuration state details (shown on display panel, default in BOLD) Config State Description Options PAT 2E31 PRBS generator pattern length 2E31, 2E23, 2E15, 2E10, 2E7 MS 0.500 PRBS generator mark space density 0.500 (1/2), 0.250 (1/4), 0.125 (1/8)

  • Page 22: Rear Panel Quick Reference

    Label SN (white area) – N4962A serial number Controls GPIB (switch panel) – N4962A GPIB address (down is ‘0’, up is ‘1’, LSB is on the left) (Default GPIB address as shipped from the factory is 25) Power (switch) – N4962A is powered when switch is toggled up towards ‘Power’...

  • Page 23: Connector Care

    N4962A System Overview 2.3 Connector Care Inspect the connectors for the following: Worn or damaged threads • Scratches to mating surface • Burrs and loose metal particles • Dust or foreign material in the space surrounding the center pin (type •...
  • Page 24 N4962A System Overview Serial BERT 12.5 Gb/s User Guide...

  • Page 25: System Details And Performance Specifications

    10°C to 40°C ambient temperature after a 30 minute warm-up phase. If not otherwise stated, all unused RF inputs and outputs must be terminated with the included 50 Ω-terminated connectors. 3.1 General Table 2. General and mechanical parameters of N4962A Operating Temperature +10°C to +40°C Storage Temperature –40°C to +70°C...

  • Page 26: Safety And Regulatory

    3.2 Safety and Regulatory Do not remove instrument covers. There are no user serviceable parts within. Operation of the instrument in a manner not specified by Agilent Technologies may result in personal injury or loss of life. To prevent electrical shock, disconnect instrument from mains before cleaning.

  • Page 27: Internal Clock

    Figure 5. N4962A block diagram – internal clock system The internal LF 1/16th-rate clock can be phase locked to an external source in order to synchronize the N4962A with the external device. To synchronize the clocks, follow the procedure detailed below. The internal or external LF clock is available from the buffered LF TrigO connector.
  • Page 28 2. Turn off the external signal generator RF output 3. Set the external signal generator to the new 1/16th-rate frequency 4. Set the N4962A to new HF frequency value (or nearest value) 5. Turn on the external signal generator RF output 6.
  • Page 29 TXCKI input and at least +4 dBm (1 V pp) is applied to the RXCKI input. Do not apply more than +10 dBm (2 V pp) to these inputs. Table 4. Parameters for N4962A internal clock (TX CKO, RX CKO, HF TrigO) Frequency 9.85 to 11.35 GHz...

  • Page 30: Prbs Generator

    System Details and Performance Specifications Table 5. Parameters for N4962A internal clock jitter injection (JitterI) Frequency Typ: DC to 100 MHz Input Voltage 2 V pp max Jitter Added Up to 5 UI ≤ 2 MHz, up to 0.15 UI ≥ 10 MHz Connector Female SMA, single-ended, DC coupled, 50 Ω...
  • Page 31 Pat TrigO has a frequency equal to (clock_rate) / (32 * bit_pattern_length). Users of Pat TrigO should verify that its output is a square wave in order to ensure proper pattern triggering. Table 6. Parameters for N4962A PRBS generator (OUT, OUT ¯¯¯) Data rate 0.5 to 12.5 Gb/s...

  • Page 32: Error Detector

    360-degree electronic phase shifter. The phase shifter delays the clock input to the detector, allowing the user to select the optimal sampling point. The N4962A can automatically adjust the receiver phase to the best sampling point, detailed in Section 4.6.
  • Page 33 Users requiring greater precision in receiver clock and data alignment below 5 GHz can achieve this result using external means such as a mechanical phase-shifter. Table 8. Parameters for N4962A error detector (IN, IN ¯¯) Data rate 0.5 to 12.5 Gb/s PRBS patterns –...

  • Page 34: Data Path

    22 bits 4194304 seconds (48.5 days) 3.6 Data Path The N4962A can operate in one of three data path configurations. The data path can be set from the front panel, detailed in Section 4.2.2, or through GPIB remote commands. The current data path is indicated with the front panel lights. One of the three lights will be lit.
  • Page 35 System Details and Performance Specifications Table 10. N4962A data path configurations Data Path light Configuration PRBS generator Additional path loss Disabled IN/IN ¯¯ connected to error Disabled detector, default Enabled Enabled IN/IN ¯¯ connected to error detector Thru IN/IN ¯¯ connected to Enabled Typ.
  • Page 36 System Details and Performance Specifications Serial BERT 12.5 Gb/s User Guide...

  • Page 37: Operation

    Operation 4 Operation The following section provides detailed information regarding the use of the N4962A serial BERT 12.5 Gb/s. Please refer to the front and rear panel quick reference, in Section 2, for abbreviated information. 4.1 General Information The N4962A serial BERT 12.5 Gb/s should be used in accordance with the following: Read and follow operating instructions;...

  • Page 38: Performance Recommendations

    Terminate all unused RF connectors with 50 Ω terminations. • 4.1.2 Connector Care The N4962A serial BERT 12.5 Gb/s features high-quality SMA connectors, and two 2.92 mm K-connectors for the front-panel OUT/OUT ¯¯¯ interface. Agilent Technologies does not recommend using male SMA connectors with the female K-connectors;...

  • Page 39: Front Panel Interface

    4.2 Front Panel Interface Figure 8. N4962A front panel The N4962A front panel indicates system configuration, and can be used for local operation of the instrument. The front panel contains three groupings of buttons and lights (local, receiver, and data path controls; configuration adjustment controls;...

  • Page 40: Front Panel - Display Panel

    Operation 4.2.1 Front Panel – Display Panel Figure 9. N4962A front panel – display panel Table 11. N4962A front panel – display panel Text Type Description Default The error light is lit for a short period of time when the error detector identifies a Error ε...

  • Page 41: Front Panel - Local, Receiver, And Data Path Controls

    Operation 4.2.2 Front Panel – Local, Receiver, and Data Path Controls Figure 10. N4962A front panel – local, receiver, and data path controls Table 12. N4962A front panel – local, receiver, and data path controls Text Type Description Default Light indicates local control: ON when front-panel control is •...
  • Page 42 Operation Light indicates error detector is ON, and: Elapsed time is accumulating; • Total bits and errors are being • counted; BER measurement is being calculated. • If detector is ON, pressing button: Saves state (# bits, errors, & • Receiver button seconds);...

  • Page 43: Front Panel - Configuration Adjustment Controls

    ¯¯¯¯¯¯ with some path Thru loss, PRBS generator is enabled; (none) Button cycles between the data path options. 4.2.3 Front Panel – Configuration Adjustment Controls Figure 11. N4962A front panel – configuration adjustment controls Serial BERT 12.5 Gb/s User Guide...
  • Page 44 Operation Table 13. N4962A front panel – configuration adjustment controls Text Type Description Default Buttons adjust internal clock frequency by 0.01 GHz: UP increases frequency (max 11.35 GHz); • DOWN decreases frequency (min 9.85 GHz). • Display will briefly show new frequency setting...
  • Page 45 Operation Text Type Description Default PRBS output pattern length setting, where NoData 0 pattern lengths are 2 -1, and n has a value in [31, 1234R567 23, 15, 10, 7]. 2 -1 is the longest pattern, and repeats every 0.2 seconds at a clock speed of 10GHz.
  • Page 46 This should be set to 0 when using a different manufacturer’s pattern generator, or a known good signal is used with the N4962A source. TD= 0010 • Min 0010 (1 µs), max 6500 (650 µs) The TD (“Training Delay”) option delays the start...
  • Page 47 Operation Text Type Description Default listed in 1/10 microseconds (default 1us), allows the PRBS pattern time to transition through the DUT before measurement start. This can be very important for DUTs containing a long electrical length or an optical loop. APT=0010 •...

  • Page 48: Front Panel - Display Selection Controls

    1E-10 8E-11 1E-9 8E-10 1E-8 8E-9 1E-7 8E-8 1E-6 8E-7 1E-5 8E-6 1E-4 8E-5 1E-3 8E-4 4.2.4 Front Panel – Display Selection Controls Figure 12. N4962A front panel – display selection controls Serial BERT 12.5 Gb/s User Guide...
  • Page 49 Operation Table 15. N4962A front panel – display selection controls Text Type Description Default Buttons select the measurement or configuration option to display on the display panel: UP selects the previous display item; • DOWN selects the next display item.
  • Page 50 GHz. When using an external clock (Synth = 0), then the Freq adjust range is increased to 500 MHz min, 12.5 GHz max. The N4962A Frequency setting should be set to the frequency of the external clock so that the N4962A frequency dependent parameters are correctly set.

  • Page 51: Rear Panel Interface

    4.3 Rear Panel Interface Figure 13. N4962A rear panel The N4962A rear panel features connectors for the internal and external clock system, as well as a PRBS pattern trigger, and a differential pair of connectors for a unique data path (DataThru). The rear panel also includes a 5-bit GPIB address switch, and a GPIB connector.
  • Page 52 Operation TX CKO and RX CKO are the internal clock output ports. These are connected to TX CKI and RX CKI when the internal clock is used to trigger the PRBS generator and error detector. The clock output ports are detailed in Section 3.3.

  • Page 53: Power-On State

    Operation 4.4 Power-On State The power-on state of the N4962A is set after turning the rear Power switch on. The internal clock is active and generates a 10.0 GHz clock. The PRBS generator is off. The error detector is off, in training mode, and will not accumulate errors.

  • Page 54: System Verification

    Operation 4.5 System Verification When first using the N4962A and before using the machine to test an external DUT, first confirm that the system is generating a PRBS bit stream and can detect bit errors. 4.5.1 Self Test Mode Verify the PRBS generator and error detector are both functioning by configuring the system in self-test mode as follows: connect the OUT/OUT ¯¯¯...

  • Page 55: Error Free Test

    Operation 4.5.2 Error Free Test When the error detector clock phase is correctly adjusted, the default settings will result in error-free operation. The Error ε light will be off, and the measured BER will be zero. Check the error-free operation as follows: •...

  • Page 56: Low Ber Test

    Operation 4.5.4 Low BER Test To verify that the error detector can correctly count a small number of errors, use the PRBS error injection capability to insert a known number of errors into the bit stream, as follows: Put the system in self test mode, described in Section 4.5.1. •...
  • Page 57 The N4962A can automatically detect and set the detector clock phase for the best sampling point. It requires that the system settings and data path allow error-free operation.
  • Page 58 Operation To automatically set the detector clock phase adjustment: With the N4962A powered, clocks connected, and data path connected: Ensure the Data Path > Enabled option is selected (PRBS output must • be on) Ensure the Receiver > On is not selected (the error detector must be •...

  • Page 59: Basic Ber Measurement

    Operation 4.7 Basic BER Measurement The N4962A can quickly be used for basic BER measurements as follows: connect the OUT/OUT ¯¯¯ ports to the DUT input, connect the IN/IN ¯¯ ports to the DUT output, use the internal clock, power the system, enable the PRBS output, adjust the detector clock phase, and turn on the error detector.
  • Page 60 Operation Serial BERT 12.5 Gb/s User Guide...

  • Page 61: Remote Gpib Interface

    Remote GPIB Interface 5 Remote GPIB Interface The N4962A can be controlled and queried with the rear-panel GPIB interface. The GPIB interface complies with IEEE standard 488.2-1992. To learn more about the GPIB interface, consult the following books from the IEEE: The International Institute of Electrical and Electronic Engineers.

  • Page 62: Gpib Capabilities

    Remote GPIB Interface 5.1 GPIB Capabilities The GPIB interface capabilities are described in Table 17. Table 17. N4962A GPIB capabilities Mnemonic Function Complete source handshake capability Complete acceptor handshake capability Basic talker; serial poll; unaddressed to talk if addressed to listen; no talk only Basic listener;...

  • Page 63: Gpib Command Syntax

    Remote GPIB Interface 5.2 GPIB Command Syntax The N4962A can be controlled through the GPIB interface using commands and queries. The commands and queries are documented in the Backus-Naur Form notation, detailed in Table 18. Table 18. N4962A GPIB command and query syntax...

  • Page 64: Command Structure

    Remote GPIB Interface 5.2.1 Command Structure The GPIB interface allows commands, which tell the instrument to take a specific action, and queries, which ask the instrument to return information. Commands are composed of syntactic elements: Header – the command name; if it ends with a question mark, the •...

  • Page 65: Ieee Common Commands

    5.3 IEEE Common Commands The IEEE 488.2 standard has a list of reserved commands that must be implemented by all instruments using the standard. The N4962A implements all of the required commands, listed in Table 19. Table 19. N4962A IEEE common commands...

  • Page 66: Scpi Mandated Commands

    :SYSTEM:VERSION? Returns SCPI protocol version number (1999.0) 5.5 N4962A Device Commands The N4962A device commands are summarized in Table 21. The following descriptions and examples assume the user is programming with Agilent BASIC, a simple interpretative language that is convenient for instrument programming.

  • Page 67: Internal Clock Commands

    Remote GPIB Interface Command Parameters / Results :SOURce:PRBS:INVert {? | ON | OFF} :SOURce:PRBS:IERR:RATe {? | OFF | ERR1E{0 <= value <= 7}} :SOURce:VOLTage:[LEVel]:[AMPLitude] {? | {300 <= value <= 1800}} :MODe {? | NORMal | THRU | OFF} :SENSe:NOData {? | ON | OFF} :SYSTem:STATus? {BITERROR | NODATA | NORXCLK}...
  • Page 68 Remote GPIB Interface Command :SOURce:ROSCillator:SOURce {INTernal | EXTernal} Type Command Description Selects the low-frequency clock to be used. INTernal selects and powers the internally-generated clock, EXTernal selects the external clock connected to Ext CKI, and powers down the internal clock. Parameters {INTernal | EXTernal} Example...
  • Page 69 Remote GPIB Interface Example OUTPUT 725; ":SOUR:ROSC:SOUR INT" OUTPUT 725; ":SOUR:ROSC:INT:FREQ 10500” OUTPUT 725; ":SOUR:ROSC:FREQ?" ENTER 725; value$ PRINT value$ ! should be “10500” Command :SOURce:ROSCillator:JITTer? Type Query Description Returns the current jitter injection mode. Results {ON | OFF} See below Example Command :SOURce:ROSCillator:JITTer {ON| OFF}...

  • Page 70: Prbs Pattern Commands

    Remote GPIB Interface 5.5.2 PRBS Pattern Commands Command :SOURce:PATTern? Type Query Description Returns the current PRBS pattern length. Results PRBS{7 | 10 | 15 | 23 | 31} See below Example Command :SOURce:PATTern {PRBS{7 | 10 | 15 | 23 | 31}} Type Command Description...
  • Page 71 Remote GPIB Interface Command :SOURce:PRBS:MARKspace? Type Query Description Returns the current PRBS pattern mark space density. Results MS{2 | 4 | 8} See below Example Command :SOURce:PRBS:MARKspace {MS{2 | 4 | 8}} Type Command Description Sets PRBS pattern mark space density to the value indicated in the command line.
  • Page 72 Remote GPIB Interface Command :SOURce:PRBS:INVert {ON | OFF} Type Command Description Sets PRBS invert setting to the value indicated in the command line. If ON, the PRBS signal is inverted. Parameters {ON | OFF} Example OUTPUT 725; ":SOUR:PRBS:INV ON" OUTPUT 725; ":SOUR:PRBS:INV?" ENTER 725;...
  • Page 73 Remote GPIB Interface Command :SOURce:VOLTage:AMPLitude? Type Query Description Returns the current single-ended PRBS output amplitude, in mVpp per side. (double this number for differential) Results {300 <= value <= 1800} See below Example Command :SOURce:VOLTage:AMPLitude {300 <= value <= 1800} Type Command Description...

  • Page 74: Measurment Commands

    Remote GPIB Interface 5.5.3 Measurment Commands Command :MODe? Type Query Description Returns the current data path. Results {NORM | THRU | OFF} See below Example Command :MODe {NORMal | THRU | OFF} Type Command Sets the instrument data path: Description NORMal Normal operation, IN/IN ¯¯connected to error detector, PRBS generator enabled.
  • Page 75 See below Example Command :SENSe:NOData {ON | OFF} Type Command Description Sets the NoData sense function. When used with the N4962A source, helps to detect all-zeros' data. Parameters {ON | OFF} Example OUTPUT 725; ":SENS:NOData OFF" OUTPUT 725; ":SENS:NOData?" ENTER 725;...
  • Page 76 Remote GPIB Interface Command :SYSTem:STATus? {BITERROR | NODATA | NORXCLK} Type Query Description Returns the state of the output indicator: BITERROR Indicates the current status of the BERT error light; the light is lit when errors are counted; the query returns 0 when the light is lit NODATA Indicates the current status of the NoData flag determined by the instrument (only if NODATA is turned on, see above);...
  • Page 77 Command Description Sets the error detector clock phase for sampling point. If AUTO, the N4962A will automatically determine the optimum phase for best sampling point once, and set the phase to that value. For data rates less than 5 GHz, the phase detector is limited to 0, 90, 180, or 270 degree increments.
  • Page 78 Remote GPIB Interface Example OUTPUT 725; ":SENS:ROSC:PHAS AUTO" OUTPUT 725; ":SENS:ROSC:PHAS?" ENTER 725; value$ PRINT value$ ! should be a number 0-360 Command :SENSe:SWEep:TIME? Type Query Description Returns the current measurement time setting; how long the measurement is intended to run for, in seconds. Results {0.001 <= value <= 4194303.999} See below...
  • Page 79 Remote GPIB Interface Command :SENSe:TRAIn? Type Query Description Returns the current training delay time setting; how long to pause for the transit time of the DUT before the measurement starts, in 1/10ths of a microsecond. Results {10 <= value <= 6500} See below Example Command...
  • Page 80 Remote GPIB Interface Command :STATus:OPERation:MEASurement:CONDition? Type Query Description Returns 1 if measurement is in progress. Results {0 | 1} Example OUTPUT 725; ":SENS:SWE:TIME 10" OUTPUT 725; ":TRIG:INIT" WAIT 2 OUTPUT 725; ":STAT:OPER:MEAS:COND?” ENTER 725; value$ PRINT value$ ! should be “1” Command :INITiate:BER Type...
  • Page 81 Remote GPIB Interface Command :TRIGger:ABORt Type Command Description Aborts data acquisition (ends testing); equivalent to turning off the receiver. Parameters Example See below Command :TRIGger:SAMPle Type Command Description Takes sample of current measurement. Does not return any values, but allows the values to be queried by other commands. Parameters Example See below...
  • Page 82 Remote GPIB Interface Example OUTPUT 725; ":SENS:SWE:TIME 10" OUTPUT 725; ":TRIG:INIT" WAIT 2 OUTPUT 725; ":TRIG:SAMPLE” OUTPUT 725; ":SENS:DATA? BER” ENTER 725; value$ PRINT value$ ! BER value after 2 seconds Command :FETCh:BER? [BCOunt | ECOunt | ETIMe | BER | ALL] Type Querry Description...

  • Page 83: Examples

    Remote GPIB Interface 5.6 Examples The following programming example assumes the user is programming with Agilent BASIC, a simple interpretative language that is convenient for instrument programming. For the example programs below, the device being programmed is located at GPIB device address 725. The actual address varies according to how you have configured the GPIB bus for your own application.
  • Page 84 380 PRINT mrk$ ! print "markspace density" setting The N4962A has a programmable PRBS output level which can be set from 300 mv to 1800 mv in 10 mV steps. This block of code demonstrates how to program this feature.
  • Page 85 Remote GPIB Interface 430 OUTPUT 725; ":SOURCE:PRBS:IERR:RATE ERR1E3" ! set err inject rate=1E3/sec 430 OUTPUT 725; ":SOURCE:PRBS:IERR:RATE OFF" ! turn error injection OFF 440 OUTPUT 725; ":SOURCE:PRBS:IERR:RATE?" ! query the result 450 ENTER 725; result$ ! read the result 460 PRINT result$ ! print the query result The next block of code shows how to set up a timed Bit Error Measurement of 5 seconds and report the BER at the end of the measurement interval.
  • Page 86 Remote GPIB Interface Serial BERT 12.5 Gb/s User Guide...

  • Page 87: Returning The N4962A Serial Bert To Agilent Technologies

    Serial BERT to Agilent Technologies 6 Returning the N4962A Serial BERT to Agilent Technologies If the N4962A serial BERT 12.5 Gb/s fails system verification and you cannot correct the problem, return it to Agilent Technologies for repair following the steps shown below.
  • Page 88 © Copyright Agilent Technologies 2012 Third edition, May 2013 Printed in Germany...

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