Tektronix Series 3400 Pulse Pattern Generators User's Manual User manual

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A GREATER MEASURE OF CONFIDENCE

Series 3400 Pulse Pattern Generators

User’s Manual

3400S-900-01 Rev. B / January 2007

WARRANTY

Keithley Instruments, Inc. warrants this product to be free from defects in material and workmanship for a period of 1 year from date of shipment.

Keithley Instruments, Inc. warrants the following items for 90 days from the date of shipment: probes, cables, rechargeable batteries, diskettes, and documentation.

During the warranty period, we will, at our option, either repair or replace any product that proves to be defective.

To exercise this warranty, write or call your local Keithley Instruments representative, or contact Keithley Instruments headquarters in Cleveland, Ohio. You will be given prompt assistance and return instructions. Send the product, transportation prepaid, to the indicated service facility. Repairs will be made and the product returned, transportation prepaid. Repaired or replaced products are warranted for the balance of the original warranty period, or at least 90 days.

LIMITATION OF WARRANTY

This warranty does not apply to defects resulting from product modification without Keithley Instruments’ express written consent, or misuse of any product or part. This warranty also does not apply to fuses, software, non-rechargeable batteries, damage from battery leakage, or problems arising from normal wear or failure to follow instructions.

THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. THE REMEDIES PROVIDED HEREIN ARE BUYER’S SOLE AND EXCLUSIVE REMEDIES.

NEITHER KEITHLEY INSTRUMENTS, INC. NOR ANY OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS INSTRUMENTS AND SOFTWARE EVEN IF KEITHLEY INSTRUMENTS, INC., HAS BEEN ADVISED IN ADVANCE OF THE POSSIBILITY OF SUCH DAMAGES. SUCH EXCLUDED DAMAGES SHALL INCLUDE, BUT ARE NOT LIMITED TO: COSTS OF REMOVAL AND INSTALLATION, LOSSES SUSTAINED AS THE RESULT OF INJURY TO ANY PERSON, OR DAMAGE TO PROPERTY.

A G R E A T E R M E A S U R E O F C O N F I D E N C E

Keithley Instruments, Inc.

Corporate Headquarters • 28775 Aurora Road • Cleveland, Ohio 44139

440-248-0400 • Fax: 440-248-6168 • 1-888-KEITHLEY (534-8453) • www.keithley.com

12/06

Series 3400

Pulse/Pattern Generators

User’s Manual

Document Number:

Cleveland, Ohio, U.S.A.

3400S-900-01 Rev. B / January 2007

Manual Print History Series 3400 Pulse/Pattern Generators User’s Manual

Manual Print History

The print history shown below lists the printing dates of all Revisions and Addenda created for this manual. The Revision Level letter increases alphabetically as the manual undergoes subsequent updates. Addenda, which are released between Revisions, contain important change information that the user should incorporate immediately into the manual. Addenda are numbered sequentially. When a new Revision is created, all Addenda associated with the previous Revision of the manual are incorporated into the new Revision of the manual. Each new Revision includes a revised copy of this print history page.

Revision A (Document Number 3400S-900-01)..................................................... July 2006

Revision B (Document Number 3400S-900-01)...............................................January 2007

All Keithley Instruments product names are trademarks or registered trademarks of Keithley Instruments, Inc. Other brand names are trademarks or registered trademarks of their respective holders.

3400S-900-01 Rev. B / January 2007

The following safety precautions should be observed before using this product and any associated instrumentation. Although some instruments and accessories would normally be used with non-hazardous voltages, there are situations where hazardous conditions may be present.

This product is intended for use by qualified personnel who recognize shock hazards and are familiar with the safety precautions required to avoid possible injury. Read and follow all installation, operation, and maintenance information carefully before using the product. Refer to the manual for complete product specifications.

If the product is used in a manner not specified, the protection provided by the product may be impaired.

The types of product users are:

Responsible body is the individual or group responsible for the use and maintenance of equipment, for ensuring that the equipment is operated within its specifications and operating limits, and for ensuring that operators are adequately trained.

Operators use the product for its intended function. They must be trained in electrical safety procedures and proper use of the instrument. They must be protected from electric shock and contact with hazardous live circuits.

Maintenance personnel perform routine procedures on the product to keep it operating properly, for example, setting the line voltage or replacing consumable materials. Maintenance procedures are described in the manual. The procedures explicitly state if the operator may perform them. Otherwise, they should be performed only by service personnel.

Safety Precautions

Service personnel are trained to work on live circuits, and perform safe installations and repairs of products. Only properly

trained service personnel may perform installation and service procedures.

Keithley Instruments products are designed for use with electrical signals that are rated Measurement Category I and Measurement Category II, as described in the International Electrotechnical Commission (IEC) Standard IEC 60664. Most measurement, control, and data I/O signals are Measurement Category I and must not be directly connected to mains voltage or to voltage sources with high transient over-voltages. Measurement Category II connections require protection for high transient over-voltages often associated with local AC mains connections. Assume all measurement, control, and data I/O connections are for connection to Category I sources unless otherwise marked or described in the Manual.

Exercise extreme caution when a shock hazard is present. Lethal voltage may be present on cable connector jacks or test fixtures. The American National Standards Institute (ANSI) states that a shock hazard exists when voltage levels greater than 30V RMS, 42.4V peak, or 60VDC are present. A good safety practice is to expect that hazardous voltage is present in any unknown circuit before measuring.

Operators of this product must be protected from electric shock at all times. The responsible body must ensure that operators are prevented access and/or insulated from every connection point. In some cases, connections must be exposed to potential human contact. Product operators in these circumstances must be trained to protect themselves from the risk of electric shock. If the circuit is capable of operating at or above 1000 volts, no conductive part of the circuit may be exposed.

Do not connect switching cards directly to unlimited power circuits. They are intended to be used with impedance limited sources. NEVER connect switching cards directly to AC mains. When connecting sources to switching cards, install protective devices to limit fault current and voltage to the card.

Before operating an instrument, make sure the line cord is connected to a properly grounded power receptacle. Inspect the connecting cables, test leads, and jumpers for possible wear, cracks, or breaks before each use.

12/06

When installing equipment where access to the main power cord is restricted, such as rack mounting, a separate main input

power disconnect device must be provided, in close proximity to the equipment and within easy reach of the operator.

For maximum safety, do not touch the product, test cables, or any other instruments while power is applied to the circuit under test. ALWAYS remove power from the entire test system and discharge any capacitors before: connecting or disconnecting cables or jumpers, installing or removing switching cards, or making internal changes, such as installing or removing jumpers.

Do not touch any object that could provide a current path to the common side of the circuit under test or power line (earth) ground. Always make measurements with dry hands while standing on a dry, insulated surface capable of withstanding the voltage being measured.

The instrument and accessories must be used in accordance with its specifications and operating instructions or the safety of the equipment may be impaired.

Do not exceed the maximum signal levels of the instruments and accessories, as defined in the specifications and operating information, and as shown on the instrument or test fixture panels, or switching card.

When fuses are used in a product, replace with same type and rating for continued protection against fire hazard.

Chassis connections must only be used as shield connections for measuring circuits, NOT as safety earth ground connections.

If you are using a test fixture, keep the lid closed while power is applied to the device under test. Safe operation requires the use of a lid interlock.

If a screw is present, connect it to safety earth ground using the wire recommended in the user documentation.

The symbol on an instrument indicates that the user should refer to the operating instructions located in the manual.

The symbol on an instrument shows that it can source or measure 1000 volts or more, including the combined effect of normal and common mode voltages. Use standard safety precautions to avoid personal contact with these voltages.

The symbol on an instrument shows that the surface may be hot. Avoid personal contact to prevent burns.

The symbol indicates a connection terminal to the equipment frame.

The WARNING heading in a manual explains dangers that might result in personal injury or death. Always read the associated information very carefully before performing the indicated procedure.

The CAUTION heading in a manual explains hazards that could damage the instrument. Such damage may invalidate the warranty.

Instrumentation and accessories shall not be connected to humans.

Before performing any maintenance, disconnect the line cord and all test cables.

To maintain protection from electric shock and fire, replacement components in mains circuits, including the power transformer, test leads, and input jacks, must be purchased from Keithley Instruments. Standard fuses, with applicable national safety approvals, may be used if the rating and type are the same. Other components that are not safety related may be purchased from other suppliers as long as they are equivalent to the original component. (Note that selected parts should be purchased only through Keithley Instruments to maintain accuracy and functionality of the product.) If you are unsure about the applicability of a replacement component, call a Keithley Instruments office for information.

To clean an instrument, use a damp cloth or mild, water based cleaner. Clean the exterior of the instrument only. Do not apply cleaner directly to the instrument or allow liquids to enter or spill on the instrument. Products that consist of a circuit board with no case or chassis (e.g., data acquisition board for installation into a computer) should never require cleaning if handled according to instructions. If the board becomes contaminated and operation is affected, the board should be returned to the factory for proper cleaning/servicing.

Section Topic Page

1 Pulse/Pattern Generators Overview .................................................. 1-1

Series 3400 summary ................................................................................. 1-2

Features................................................................................................ 1-2

Basic pulse parameters............................................................................... 1-3

Pulse level parameters ......................................................................... 1-4

Pulse timing and triggering parameters................................................ 1-5

Operating modes......................................................................................... 1-5

Pulse mode........................................................................................... 1-5

Burst mode ........................................................................................... 1-5

Pattern mode ........................................................................................ 1-6

External Width mode ............................................................................ 1-7

Additional pulse characteristics................................................................... 1-8

Duty cycle ............................................................................................. 1-8

Interchannel delay (skew)..................................................................... 1-8

Jitter ...................................................................................................... 1-9

Distortion............................................................................................... 1-9

2 Getting Started........................................................................................ 2-1

General information..................................................................................... 2-2

Warranty information ............................................................................ 2-2

Keithley Instruments website – contact information.............................. 2-2

Inspection ............................................................................................. 2-2

Options and accessories ...................................................................... 2-2

Front and rear panel familiarization............................................................. 2-3

Front panel............................................................................................ 2-3

Rear panel ............................................................................................ 2-4

Power-up..................................................................................................... 2-5

Ventilation............................................................................................. 2-5

Display ........................................................................................................ 2-6

Editing parameter values and settings.................................................. 2-8

Defaults ....................................................................................................... 2-9

3 Signal Connections ............................................................................... 3-1

Introduction ................................................................................................. 3-2

Out 1 and Out 2 connections ...................................................................... 3-2

Trig Out and Ext In connections.................................................................. 3-3

Strobe Out connection................................................................................. 3-4

Clk In connections....................................................................................... 3-4

Ref Out and Ref In connections .................................................................. 3-5

Table of Contents Series 3400 Pulse/Pattern Generators User’s Manual

Section Topic Page

4 Pulse/Pattern Generators Operation................................................. 4-1

Pulse, Burst and External Width operation ................................................. 4-3

Pulse mode .......................................................................................... 4-4

Burst mode ........................................................................................... 4-6

External Width mode ............................................................................ 4-7

Pattern operation ........................................................................................ 4-8

Saving and recalling setups ...................................................................... 4-12

Saving a setup.................................................................................... 4-12

Recalling a setup................................................................................ 4-12

Returning to default settings............................................................... 4-12

Pulse/pattern parameters.......................................................................... 4-13

Ampl – amplitude................................................................................ 4-13

Bit # .................................................................................................... 4-14

Block................................................................................................... 4-14

Brst Cnt – burst count......................................................................... 4-14

Cal – calibration.................................................................................. 4-14

ChAdd (3402 only) – channel add...................................................... 4-15

Channel .............................................................................................. 4-15

ClkIn – clock input .............................................................................. 4-15

Delay .................................................................................................. 4-15

Display................................................................................................ 4-16

Double ................................................................................................ 4-16

Edit ..................................................................................................... 4-16

Emul – emulation................................................................................ 4-16

ExtIn – external input.......................................................................... 4-17

Format ................................................................................................ 4-17

Freq – frequency ................................................................................ 4-17

GPIBAdd – GPIB address .................................................................. 4-17

Hi Cur – high current limit................................................................... 4-17

HiLvl – high level ................................................................................ 4-18

Hi Volt – high voltage limit .................................................................. 4-18

IOPort – I/O port (interface)................................................................ 4-18

I/V – current or voltage ....................................................................... 4-18

LeadE – leading edge ........................................................................ 4-18

Length ................................................................................................ 4-19

LoadZ – load impedance.................................................................... 4-20

Lo Cur – low current limit.................................................................... 4-21

LoLvl – low level ................................................................................. 4-21

Lo Volt – low voltage limit ................................................................... 4-21

Offset.................................................................................................. 4-21

On/Off (limits) ..................................................................................... 4-22

Per – period........................................................................................ 4-22

PerSrc – period source....................................................................... 4-22

Pol – polarity....................................................................................... 4-23

PLLRef – PLL reference..................................................................... 4-23

PRBS n – pseudo random bit sequence ........................................... 4-23

Recall ................................................................................................. 4-24

Save ................................................................................................... 4-24

SrcZ – source impedance .................................................................. 4-24

System ............................................................................................... 4-24

TrailE – trailing edge........................................................................... 4-24

TrgFreq – trigger frequency................................................................ 4-25

TrgMode – trigger mode ..................................................................... 4-25

TrigPer – trigger period....................................................................... 4-25

TrgSlope – trigger slope ..................................................................... 4-25

TrgSrc – trigger source....................................................................... 4-26

Update................................................................................................ 4-26

Width .................................................................................................. 4-26

ii 3400S-900-01 Rev. B / January 2007

Series 3400 Pulse/Pattern Generators User’s Manual Table of Contents

Section Topic Page

5 Triggering................................................................................................. 5-1

Triggering overview..................................................................................... 5-2

Double pulse ........................................................................................ 5-2

Period source (PerSrc)......................................................................... 5-2

Trigger source (TrgSrc) ........................................................................ 5-3

Trigger Out and Strobe Out .................................................................. 5-3

PLL reference (PLLRef) ...................................................................... 5-3

Continuous.................................................................................................. 5-4

Continuous Pulse mode ....................................................................... 5-4

Continuous Burst mode........................................................................ 5-4

Continuous Pattern mode..................................................................... 5-5

Triggered..................................................................................................... 5-6

Triggered Pulse mode .......................................................................... 5-6

Triggered Burst mode........................................................................... 5-8

Triggered Pattern mode...................................................................... 5-10

Gated ........................................................................................................ 5-13

Gated Pulse mode.............................................................................. 5-13

Gated Burst mode .............................................................................. 5-14

Gated Pattern mode ........................................................................... 5-16

External Width........................................................................................... 5-17

User Interface and remote programming mapping ................................... 5-18

6 Remote Programming........................................................................... 6-1

Introduction ................................................................................................. 6-2

Remote interfaces....................................................................................... 6-2

Selecting an interface........................................................................... 6-2

IEEE-488 interface ............................................................................... 6-2

USB interface ....................................................................................... 6-3

Status model ............................................................................................... 6-4

Status register sets............................................................................... 6-5

Status byte and service request (SRQ) ................................................ 6-5

Standard Event Status Register ........................................................... 6-6

Operation Status group ........................................................................ 6-7

Questionable Status group ................................................................... 6-7

Service request programming example................................................ 6-7

Common commands................................................................................... 6-7

Command summary ............................................................................. 6-7

Command examples ............................................................................ 6-8

SCPI command reference........................................................................... 6-9

Command summary ............................................................................. 6-9

Command descriptions....................................................................... 6-14

Appendix Topic Page

A Specifications............................................................................................ A-1

Index I-1

3400S-900-01 Rev. B / January 2007 iii

Table of Contents Series 3400 Pulse/Pattern Generators User’s Manual

This page left blank intentionally.

iv 3400S-900-01 Rev. B / January 2007

List of Figures

Section Figure Title Page

1 Figure 1-1 Default pulse level and timing parameter settings

(Pulse mode, continuous triggering) .............................................. 1-3

Figure 1-2 Example output pattern for RZ and NRZ data formats................... 1-6

Figure 1-3 External Width mode ...................................................................... 1-7

Figure 1-4 Example of 50% duty cycle ............................................................ 1-8

Figure 1-5 Interchannel delay (skew) .............................................................. 1-8

Figure 1-6 Distortion – Preshoot, overshoot and ringing ................................. 1-9

2 Figure 2-1 Front panel familiarization (Model 3402-F)..................................... 2-3

Figure 2-2 Rear panel familiarization (Model 3402-R)..................................... 2-4

Figure 2-3 VOLTS menu options (default parameters).................................... 2-6

3 Figure 3-1 Out 1 and Out 2 connections ......................................................... 3-2

Figure 3-2 Trig Out connections ...................................................................... 3-3

Figure 3-3 Ext In connections.......................................................................... 3-3

Figure 3-4 Strobe Out connections.................................................................. 3-4

Figure 3-5 Clk In connections.......................................................................... 3-4

Figure 3-6 Ref Out and Ref In connections ..................................................... 3-5

4 Figure 4-1 Select operating mode .................................................................. 4-3

Figure 4-2 Configure Pulse mode parameters ............................................... 4-4

Figure 4-3 Configure triggering ....................................................................... 4-5

Figure 4-4 Setting Burst mode count............................................................... 4-6

Figure 4-5 PATTERN menu ........................................................................... 4-8

Figure 4-6 Block soft key options ................................................................... 4-9

Figure 4-7 Insert bit and delete bit examples ................................................ 4-10

Figure 4-8 Series 3400 output diagrams ....................................................... 4-20

Figure 4-9 Polarity ......................................................................................... 4-23

List of Figures Series 3400 Pulse/Pattern Generators User’s Manual

Section Figure Title Page

5 Figure 5-1 Continuous Pulse mode ................................................................ 5-4

Figure 5-2 Continuous Burst mode ................................................................ 5-5

Figure 5-3 Continuous Pattern mode............................................................. 5-6

Figure 5-4 Triggered Pulse mode (positive slope) ......................................... 5-7

Figure 5-5 Triggered Pulse mode (negative slope) ........................................ 5-7

Figure 5-6 Triggered Pulse mode (positive and negative slope) .................... 5-8

Figure 5-7 Triggered Burst mode (VCO period source) ................................. 5-9

Figure 5-8 Triggered Burst mode (PLL or ClkIn period source) .................... 5-10

Figure 5-9 Triggered Pattern mode (VCO period source) ............................ 5-11

Figure 5-10 Triggered Pattern mode (PLL or ClkIn period source) ................ 5-12

Figure 5-11 Gated Pulse mode (VCO period source) .................................... 5-13

Figure 5-12 Gated Pulse mode (PLL or ClkIn period source) ........................ 5-14

Figure 5-13 Gated Burst mode (VCO period source) ..................................... 5-15

Figure 5-14 Gated Burst mode (PLL or ClkIn period source)......................... 5-15

Figure 5-15 Triggered Pattern mode (VCO period source) ............................ 5-16

Figure 5-16 Triggered Pattern mode (PLL or ClkIn period source) ................ 5-17

6 Figure 6-1 IEEE-488 and USB connector locations on rear panel.................. 6-3

Figure 6-2 Status model .................................................................................. 6-4

vi 3400S-900-01 Rev. B / January 2007

List of Tables

Section Table Title Page

1 Table 1-1 Pulse level parameters................................................................... 1-4

Table 1-2 Pulse timing and triggering parameters.......................................... 1-5

2 Table 2-1 Menu summary .............................................................................. 2-7

Table 2-2 Power-on defaults .......................................................................... 2-9

4 Table 4-1 Pulse mode triggering .................................................................... 4-5

Table 4-2 Burst mode triggering..................................................................... 4-6

Table 4-3 External Width mode triggering...................................................... 4-7

Table 4-4 PRBS length settings ................................................................... 4-11

Table 4-5 Pattern mode triggering................................................................ 4-11

Table 4-6 Soft key parameters ..................................................................... 4-13

Table 4-7 Programmed voltage vs. actual voltage (VDUT)

for DUT impedance variations...................................................... 4-21

5 Table 5-1 Triggering summary ....................................................................... 5-2

Table 5-2 Mapping for User Interface settings and remote

programming commands ............................................................. 5-18

6 Table 6-1 Status Byte Register and Service Request Enable Register bits ... 6-6

Table 6-2 Standard Event Status Register bits............................................... 6-6

Table 6-3 Common commands ...................................................................... 6-7

Table 6-4 SCPI command summary ............................................................ 6-10

Table 6-5 :ARM:SOUR source selections.................................................... 6-17

Table 6-6 :DIG:PATT:DATA[1|2|3]................................................................. 6-19

Table 6-7 :TRIG:SOUR ................................................................................ 6-42

List of Tables Series 3400 Pulse/Pattern Generators User’s Manual

This page left blank intentionally.

viii 3400S-900-01 Rev. B / January 2007

In this section:

Top ic Page

Series 3400 summary ................................................................... 1-2

Basic pulse parameters .................................................................... 1-3

Operating modes............................................................................... 1-5

Section 1

Pulse/Pattern Generators Overview

Features........................................................................................ 1-2

Pulse level parameters ................................................................. 1-4

Pulse timing and triggering parameters ........................................ 1-5

Pulse mode................................................................................... 1-5

Burst mode ................................................................................... 1-5

Pattern mode ................................................................................ 1-6

External Width mode .................................................................... 1-7

Additional pulse characteristics ...................................................... 1-8

Duty cycle ..................................................................................... 1-8

Interchannel delay (skew)............................................................. 1-8

Jitter .............................................................................................. 1-9

Distortion....................................................................................... 1-9

Section 1: Pulse/Pattern Generators Overview Series 3400 Pulse/Pattern Generators User’s Manual

Series 3400 summary

The Series 3400 Pulse/Pattern Generators, currently available in two basic models, offer extensive control over pulse parameters - including amplitude, offset, leading and trailing edge times, pulse width and duty cycle. The Model 3401 is a single-channel, 165MHz pulse/pattern generator; the Model 3402 is similar, but includes a second signal output channel.

NOTE Each basic model is available with connectors located on the front panel (Model 3401-F

and Model 3402-F) or with all connectors located on the rear panel (Model 3401-R and Model 3402-R).

The operational flexibility and pattern generation capability of the Series 3400 Pulse/Pattern Generators makes them readily suitable to the specific needs of many different applications, including simplified simulation of serial data patterns when testing devices to characterize their performance under sub-optimal conditions.

Features

• Frequency Output Range: 1mHz to 165MHz

• Pulse Amplitude: ±10V (50Ω source impedance) ±20V (1kΩ source impedance)

• Pulse Width: Programmable from 3.02ns to (Period - 3.02ns)

• Leading and Trailing Edge Times: Programmable from 2.0ns to 200ms

• Pulse output programmable as voltage or current

• Four Operating Modes: Pulse mode

Burst mode Pattern mode External Width mode

• Channel Add (Model 3402 only): Make complex waveforms by adding pulse output for

Channel 1 and Channel 2

• Internal PLL and VCO period sources

• Save up to nine pulse/pattern generator setups in non-volatile memory

• GPIB and USB interfaces

• 2U full-rack design

1-2 Return to Section Topics 3400S-900-01 Rev. B / January 2007

Series 3400 Pulse/Pattern Generators User’s Manual Section 1: Pulse/Pattern Generators Overview

Ampl

(Amplitude)

1Vpp

Width

+500mV

-500mV

Per

(Period)

LeadE

(Leading Edge)

2.5ns

Trigger

Delay

0ps

HiLvl

(High

Level)

LoLvl

(Low Level)

Offset

(Median)

100ns

1µs

Freq

(Frequency)

1MHz

SrcZ (Source Impedance) = 50W LoadZ (Load Impedance) = 50W

LeadE

(Leading Edge)

2.5ns

TrailE

(Trailing Edge)

2.5ns

Time Parameters

Not Drawn To Scale

Basic pulse parameters

On power-up, the instrument is in the Pulse mode with continuous triggering selected. When a channel is enabled, it will continuously output pulses.

Figure 1-1 shows the first two pulses of the continuous pulse output. Shown are the fundamental

default settings. The parameter names in italic correspond to the parameter names in the front panel VOLTS and TIME menus.

Figure 1-1

Default pulse level and timing parameter settings (Pulse mode, continuous triggering)

3400S-900-01 Rev. B / January 2007 Return to Section Topics 1-3

The basic pulse level, timing and triggering parameters are summarized in Table 1-1 and

Table 1-2. The last column (“yes” or “no”) in the two tables does not apply to the Model 3401.

Section 1: Pulse/Pattern Generators Overview Series 3400 Pulse/Pattern Generators User’s Manual

Pulse level parameters

Table 1-1

Pulse level parameters

Independent

Channel

Settings*

Parameter Description

Output Function Configure pulse output as Current or Voltage. Yes Source Impedance Set the source impedance of the Series 3400 for 50 Ohms or 1k Ohms. Ye s Load Impedance The allowable setting ranges for pulse parameters are specified for a

Ω load. However, the load impedance setting of the Series 3400 can

50 be set to match the impedance of the DUT. Load impedance can be set

from 0.1 Ohm to 1M Ohm. High Level Low Level

Amplitude Amplitude is the low-to-high magnitude of the pulse. The Amplitude

Offset Offset is the median (average) value of the high and low levels:

Polarity Polarity can be set to Norm (normal) or Comp (complement).

Channel Add 3402 Only – Enable or Disable Channel Add. When enabled, Channel

Pulse Level Limits To protect DUT, high and low limits can be set for pulse output. Limits

* Yes = The parameter can be independently set for each of the two channels of the Model 3402.

No = The parameter setting applies to both channels of the Model 3402.

Configure the pulse high/low levels by setting the High Level and the

Low Level. Setting range depends on the source impedance setting:

50Ω into 50Ω: 0 to ±10V (or 0 to ±200mA)

1kΩ into 50Ω: 0 to ±20V (or 0 to ±400mA)

Changing the high and/or low level may change the amplitude and

offset.

setting range depends on the source impedance setting:

50Ω into 50Ω: 100mV to 10Vpp (or 2mApp to 200mApp)

1kΩ into 50Ω: 200mV to 20Vpp (or 4mApp to 400mApp)

Changing the amplitude will change the high and low levels. Offset is

not affected.

Offset = (High Level + Low Level) / 2.

The offset can be set to any value that allows the pulse to fit within the

level window. For a 100mVpp amplitude, offset can be programmed up

to 9.95V.

Changing the offset will change the high and/or low levels. Amplitude is

not affected.

Complement means that the pulse transitions from the High Level to

the Low Level.

1 pulse output is added to Channel 2 pulse output. The complex result

is available on channel 1; Channel 2 is disabled.

can be enabled (On) or disabled (Off). The Hi Lim and Lo Lim setting

ranges are the same as the setting ranges for High Level and Low

Level.

(3402 only)

Yes

1-4 Return to Section Topics 3400S-900-01 Rev. B / January 2007

Series 3400 Pulse/Pattern Generators User’s Manual Section 1: Pulse/Pattern Generators Overview

Pulse timing and triggering parameters

Table 1-2

Pulse timing and triggering parameters

Independent

Channel

Settings*

Parameter Description

Frequency Period Width Pulse width is measured at the 50% amplitude level of the pulse. Width

Delay A delay between the trigger event and the start of each pulse can be set

Leading Edge Trailing Edge

Pulse Number With Single pulse selected, one pulse per period will be output. With

Period Source The source for period generation can be PLL, VCO or an external clock

Trigger Source Select the trigger source to start pulse output: ExtIn (external input),

Trigger Mode Select the trigger mode: Cont (continuous), Trig’ d (triggered) or Gated. No Trigger Frequency

Trigger Period

* Yes = The parameter can be independently set for each of the two channels of the Model 3402.

No = The parameter setting applies to both channels of the Model 3402.

Pulse cycle time can be set as frequency or period. Frequency can be set from 1mHz to 165MHz. Period can be set from 6.06ns to 1000s.

can be set from 3.02ns to (Period - 3.02ns).

from 0 to (Period - 3.02ns). Time intervals between corresponding 10% and 90% amplitude points on the leading/trailing edge of the pulse. Leading and trailing edge

times (LeadE and Trai lE) can be individually set from 2ns to 200ms.

Double pulse selected, two pulses per period will be output.

input (ClkIn).

PLL or Manual.

Trigger speed for the PLL trigger source can be set as frequency or period. Trigger Frequency can be set from 1mHz to 165MHz. Trigger

Period can be set from 6.06ns to 1000s.

(3402 only)

Yes

Yes Yes

No No

Operating modes

The Series 3400 Pulse/Pattern Generators have four operating modes: Pulse mode, Burst mode, Pattern mode and External Width mode.

Pulse mode

Outputs a single pulse or continuous pulses per trigger event to the two output channels. The basic pulse level, timing and triggering parameters are summarized in

Burst mode

This mode is similar to the Pulse mode, except that each trigger event will output a series (burst) of pulses. In Burst mode, two to 65,536 pulses can be output.

Table 1-1 and Table 1-2.

3400S-900-01 Rev. B / January 2007 Return to Section Topics 1-5

Section 1: Pulse/Pattern Generators Overview Series 3400 Pulse/Pattern Generators User’s Manual

RZ format

Logic 1 = 5V Logic 0 = 0V

NRZ format

Output Pattern

11100010

Period Period PeriodPeriod PeriodPeriod Period Period

Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Bit 8

Pattern mode

Each channel can output a user configured bit pattern that consists of Logic 0’s and 1’s. The length of the bit pattern can be two to 16,384 bits.

The two channels of a Model 3402 can have different bit patterns, but must be the same length. Logic 0 represents the low pulse level (e.g., 0V) and Logic 1 represents the high pulse level. The following example shows different 8-bit output patterns for the two channels:

Channel 1 Output Pattern: 00110011

Channel 2 Output Pattern: 11100010

Pattern data formats

There are two data formats for output patterns: RZ (return-to-zero) and NRZ (non-return-to-zero).

Figure 1-2 shows the difference between the RZ format and the NRZ format. The 8-bit pattern is

the same for both formats (11100010), and the logic levels are the same (Logic 0 = 0V, Logic 1 = 5V):

• RZ Format – For 50% duty cycle, a Logic 1 bit goes to 5V for the first half of the period, then returns to 0V for the second half of the period (return-to-zero). A Logic 0 bit remains at 0V for the entire period.

• NRZ Format – A Logic 1 bit goes to 5V and stays at 5V for the entire period (non-return-tozero). A Logic 0 bit goes to 0V and remains at 0V for the entire period.

NOTE For either data format, the level for Logic 0 does not have to be 0V. It simply must be less

positive (more negative) than Logic 1.

Example 1: Example 2: Logic 1 = 4V Logic 1 = 0V

Logic 0 = 1V Logic 0 = -3V

Figure 1-2

Example output pattern for RZ and NRZ data formats

Pseudo Random Bit Sequencer (PRBS)

The PRBS is used to output a pseudo random pattern for testing purposes. The number of bits for the PRBS output pattern can be set as follows:

1-6 Return to Section Topics 3400S-900-01 Rev. B / January 2007

PRBS size = 2n-1 where n = 5 to 14

The RZ or NRZ data format can be used for the PRBS pattern.

Series 3400 Pulse/Pattern Generators User’s Manual Section 1: Pulse/Pattern Generators Overview

Amplitude

3 to 6V

(±)

External Input

(Ext In)

Pulse Output

(Out 1, Out 2)

Leading edge of external trigger causes output to go high

Trailing edge causes output to go low

External Width mode

In this mode, pulse output follows the edges of an external input trigger that is applied to the Ext In connector. As shown in causes the output to go low.

The external input trigger can be positive or negative polarity up to 6V. However, the external input trigger voltage must be at least ±10mV in order to be detected by the pulse/pattern generator as a valid trigger.

Figure 1-3

External Width mode

Figure 1-3, a rising edge causes the output to go high, while a falling edge

3400S-900-01 Rev. B / January 2007 Return to Section Topics 1-7

Section 1: Pulse/Pattern Generators Overview Series 3400 Pulse/Pattern Generators User’s Manual

Period

1µs

Amplitude

50%

Width 500ns

Duty Cycle = (Width / Period) x 100%

= (500ns / 1µs) x 100% = 0.5 x 100% = 50%

Channel A

Output

Channel B

Output

Interchannel Delay Skew

Amplitude

Additional pulse characteristics

The following are characteristics inherent to pulse generation, and may or may not be affected by various instrument settings and/or the load.

Duty cycle

The duty cycle is the amount of time – as a percentage of the pulse period – that the pulse is on (pulse width). Duty cycle (as a percentage) is calculated as follows:

Duty Cycle = (Width / Period) x 100

Figure 1-4 shows an example for duty cycle.

Figure 1-4

Example of 50% duty cycle

Interchannel delay (skew)

As shown in Figure 1-5, interchannel delay is the time interval between the leading pulse edge of the two Model 3402 output channels (Channel 1 and Channel 2). Skew can be adjusted through the use of the pulse Delay for each individual channel.

Figure 1-5

Interchannel delay (skew)

1-8 Return to Section Topics 3400S-900-01 Rev. B / January 2007

Series 3400 Pulse/Pattern Generators User’s Manual Section 1: Pulse/Pattern Generators Overview

100%

Preshoot (e.g., 2%)

Ringing (negative)

(e.g., -2%)

Ringing (positive)

(e.g., +3%)

Overshoot

(e.g., 5%)

Amplitude

Time

Jitter

Jitter is the short-term instability of one edge relative to a reference edge. Jitter is usually specified as an RMS value, which is one standard deviation (or sigma). If distribution is assumed Gaussian, six sigma represents 99.74% of peak-to-peak jitter.

The reference edge for period jitter is the previous leading edge. The reference edge for delay jitter is the leading edge of the trigger output. Width jitter is the stability of the trailing edge with respect to the leading edge.

Distortion

Distortion includes preshoot, overshoot and ringing. Preshoot and overshoot are peak distortions preceding/following an edge. Ringing is the positive-peak and negative-peak distortion (excluding overshoot) on pulse top or base. Distortion for a pulse is shown in preshoot, overshoot and ringing specification of 5% implies an overshoot and undershoot <5% of pulse amplitude.

Figure 1-6

Distortion – Preshoot, overshoot and ringing

Figure 1-6. A combined

3400S-900-01 Rev. B / January 2007 Return to Section Topics 1-9

Section 1: Pulse/Pattern Generators Overview Series 3400 Pulse/Pattern Generators User’s Manual

This page left blank intentionally.

1-10 Return to Section Topics 3400S-900-01 Rev. B / January 2007

In this section:

Top ic Page

General information........................................................................... 2-2

Front and rear panel familiarization ................................................. 2-3

Power-up ............................................................................................ 2-5

Section 2

Getting Started

Warranty information ..................................................................... 2-2

Keithley Instruments website – contact information ...................... 2-2

Inspection ...................................................................................... 2-2

Options and accessories ............................................................... 2-2

Front panel .................................................................................... 2-3

Rear panel..................................................................................... 2-4

Ventilation...................................................................................... 2-5

Display ................................................................................................ 2-6

Editing parameter values and settings .......................................... 2-8

Defaults............................................................................................... 2-9

Section 2: Getting Started Series 3400 Pulse/Pattern Generators User’s Manual

General information

Warranty information

Warranty information is located at the front of this manual. Should your instrument require warranty service, contact the Keithley representative or authorized repair facility in your area for further information. When returning the instrument for repair, be sure to fill out and include the service form at the back of this manual to provide the repair facility with necessary information.

Keithley Instruments website – contact information

Visit the Keithley website at www.keithley.com for information on contacting Keithley for your customer service needs, such as calibration and repair.

Inspection

The instrument was carefully inspected electrically and mechanically before shipment. After unpacking all items from the shipping carton, check for any obvious signs of physical damage that may have occurred during transit. (there may be a protective film over the display lens, which can be removed). Report any damage to the shipping agent immediately. Save the original packing carton for possible future shipment. The following items are included with every instrument order:

• Series 3400 with line cord.

• Rack Mount/Handle Kit

• Accessories as ordered.

• CD with the Quick Start Guide, User’s Manual and any Release Notes

• Hardcopy of the Quick Start Guide

Options and accessories

Cables/adapters

• Model 7051-2 General Purpose BNC to BNC Cable (2 ft)

• Model 7007-1 Shielded GPIB Cable, 1m

• Model 7007-2 Shielded GPIB Cable, 2m

• Model 7051-2 General Purpose BNC to BNC Cable, 0.6m (2 ft)

• Model 7051-5 General Purpose BNC to BNC Cable, 1.5 (5 ft)

• 7755 50Ω Feed-Through Terminator

Communication interfaces

• Model KPCI-488 GPIB/IEEE488 Interface Board for PCI Bus

• Model KUSB-488 USB-to-GPIB interface adapter for USB

• When using USB directly, use one of the following USB cables:

– USB-B-1 USB Cable Type A to B, 1m – USB-B-3 USB Cable Type A to B, 3m

2-2 Return to Section Topics 3400S-900-01 Rev. B / January 2007

Series 3400 Pulse/Pattern Generators User’s Manual Section 2: Getting Started

On/Off Switch

LCD Display

Channel 1

Parameters

Selected

Parameter

Channel 2

Parameters

Rotory Knob

Cursor Keys

Numeric Keypad

Keys

Clock, Trigger and

Strobe Connectors

(BNC)

Clock Input

10a

External

Input

10b

Trigger Output

10c

Strobe Output

10d

Output Enable

Pulse/Pattern

Output

Connectors

(BNC)

Soft Keys

Soft Key

Options

For the Rear Panel Output option, items 9 and 10 connectors are moved to the rear panel.

2 Width

Delay LeadE TrailE

3.00 ns 0 ps

2.5 ns

Pulse Mode

Ch 1 Width

3.04 ns

Trigger = PLL

1 Width

Delay LeadE TrailE

3.04 ns 0 ps

2.5 ns

Freq 165.0 MHz Per 6.06 ns

Channel Freq Per Width Delay More

+/-

Front and rear panel familiarization

Front panel

The front panel of the Model 3402-F is shown in Figure 2-1. The front panel controls and connectors for the Model 3401-F single-channel pulse/pattern generator are similar except there is only one channel. For the Model 3401, disregard all references to the second channel.

Figure 2-1

Front panel familiarization (Model 3402-F)

1. On/Off Switch – Push button switch toggles instrument on and off. When on, the green indicator in the button turns on. Note that the main power switch for the rear panel Power Module must be on (refer to

Figure 2-2).

2. LCD Display – On the Time and Volts menu keys, the display is divided into three areas:

a. Channel 1 Parameters – Displays Channel 1 parameters for the selected Function. b. Channel 2 Parameters – Displays Channel 2 parameters for the selected Function. c. Parameter Value – Displays the value of the selected parameter. Also displays related

information.

3. Menu Select Keys – The various menus are selected using these keys. The display then shows the parameters, options and other choices available for the selected menu.

4. Soft Keys – The options that can be selected depend on the selected menu and are positioned in the display immediately above the soft keys.

5. Rotary Knob – Use this knob to modify (increase or decrease) the displayed parameter value.

6. Numeric Keypad – Use this keypad to enter parameter values. After keying in a value, available options (e.g., MHz range) are displayed as soft keys.

7. Cursor Keys – Use to increment/decrement parameter values.

8. Output Enable – Push button toggles output enable for each channel on and off. When on, the green indicator in the button turns on. A trigger event will then start pulse/pattern output.

9. Pulse/Pattern Output Connectors – Output for the two channels is available at these female BNC connectors. For the Rear Panel Output option, these connectors are moved to

3400S-900-01 Rev. B / January 2007 Return to Section Topics 2-3

the rear panel for greater convenience in rack-mounted environments.

Section 2: Getting Started Series 3400 Pulse/Pattern Generators User’s Manual

Pulse/Pattern

Output

Connectors

(BNC)

Strobe, Trigger and

Clock Connectors

(BNC)

Reference

Output

Connector

(BNC)

Reference

Input

Connector

(BNC)

USB

Connector

IEEE-488

Connector

Power

Module

Clock

Input

External

Input

3c Trigger Output

3d Strobe Output

For the Front Panel Output option, items 2 and 3 connectors are moved to the front panel.

Cooling Vents

10. Clock, Trigger and Strobe Connectors – The following input/output female BNC connectors are provided:

NOTE For the Rear Panel Output option, these connectors are moved to the rear panel for

greater convenience in rack-mounted environments:

a. Clock Input – Connect an external clock. b. External Input – Connect an external signal for external triggering. c. Trigger Output – Provides a trigger pulse on each period. d. Strobe Output – Programmable NRZ in Pattern mode, marks burst width in Burst mode.

Rear panel

The rear panel of the Model 3402-R is shown in Figure 2-2. The connectors for the Model 3401-R single-channel pulse/pattern generator are similar except there is only one pulse/pattern output channel. For the Model 3401, disregard all references to the second channel.

Figure 2-2

Rear panel familiarization (Model 3402-R)

1. Power Module – Contains the AC line receptacle, main power switch and the power line fuse. Uses a toggle switch for AC power. The “0” position is off, and the “1” position is on. This toggle switch must be in the “1” (on) position to enable the front panel On/Off Switch (refer to

Figure 2-1).

2. Pulse/Pattern Output Connectors – Output for the two channels is available at these

3. Clock, Trigger and Strobe Connectors – The following input/output female BNC connec-

female BNC connectors. For the Rear Panel Output option, these connectors are moved to the rear panel for greater convenience in rack-mounted environments:

tors are provided:

NOTE For the Rear Panel Output option, these connectors are moved to the rear panel for

greater convenience in rack-mounted environments.

a. Clock Input – Connect an external clock. b. External Input – Connect an external signal for arming. c. Trigger Output – Provides a trigger pulse on each period. d. Strobe Output – Programmable NRZ in Pattern mode, marks burst width in Pulse mode.

2-4 Return to Section Topics 3400S-900-01 Rev. B / January 2007

Series 3400 Pulse/Pattern Generators User’s Manual Section 2: Getting Started

4. Reference Input Connector – This female BNC connector accepts an external 10MHz oscillator signal for PLL reference.

NOTEUse the Ref In and Ref Out to daisy-chain multiple Series 3400 units for the purpose

of using one PLL as the period source.

5. Reference Output Connector – This female BNC connector provides 10MHz single phase locked to PLL.

6. USB Connector – For USB remote operation. Use a USB cable (Model USB-B-1 or USBB-3) to connect to the USB interface of the PC.

7. IEEE-488 Connector – For GPIB remote operation. Use a shielded cable (Model 7007-1 or 7007-2).

8. Cooling Vents – The instrument uses a cooling fan and vents to keep it from overheating. Note that there is also a cooling vent on each side panel of the unit. Refer to “ information on maintaining proper ventilation for the instrument.

Ventilation” for

Power-up

The Series 3400 operates from a line voltage in the range of 100 to 240V single phase at a frequency of 50 or 60Hz. Line voltage and line frequency are automatically sensed. Therefore, there are no switches to set. Check to be sure the operating voltage in your area is compatible.

CAUTION Operating the instrument on an incorrect line voltage may cause damage, pos-

sibly voiding the warranty.

Perform the following steps to connect the Series 3400 to line power and turn it on:

1. Before plugging in the power cord, make sure the Series 3400 is turned off and the rear panel power switch is in the off (0) position.

2. Connect the female end of the supplied power cord to the AC receptacle on the rear panel, and return the power switch to the on (1) position.

WARNING The power cord supplied with the Series 3400 contains a separate ground for

use with grounded outlets. When proper connections are made, the instru ment chassis is connected to power line ground through the ground wire in the power cord. Failure to use a grounded outlet may result in personal injury or death due to electric shock.

3. Turn on the instrument by pressing the front panel on/off button.

Line fuse replacement

Two line fuses are located in a drawer in the Power Module above the AC receptacle (refer to

Figure 2-2). After turning the power switch off and removing the line cord, remove the fuses and

replace a blown fuse with the following type:

Keithley Instruments Part Number: FU-81

Fuse Type: 2A, 250V, SlowBlo, 5mm x 20mm

Ventilation

The Series 3400 uses a fan and cooling vents in the rear panel and side panels to keep it from overheating.

3400S-900-01 Rev. B / January 2007 Return to Section Topics 2-5

Section 2: Getting Started Series 3400 Pulse/Pattern Generators User’s Manual

1 Ampl

Offset HiLvl LoLvl Pol

1000 mVpp

0 mV

500 mV

-500 mV Norm

2 Ampl

Offset HiLvl LoLvl Pol

1000 mVpp

0 mV

500 mV

-500 mV Norm

Pulse Mode

Ch 1 Ampl

1000 mVpp

Trigger = PLL

Channel Pol SrcZ LoadZ ChAdd More

1 Ampl

Offset HiLvl LoLvl Pol

1000 mVpp

0 mV

500 mV

-500 mV Norm

2 Ampl

Offset HiLvl LoLvl Pol

1000 mVpp

0 mV

500 mV

-500 mV Norm

Pulse Mode

Ch 1 Ampl

1000 mVpp

Trigger = PLL

Press More key to display more VOLTS menu options

Channel I/V Limits More

Press More key to display more VOLTS menu options

Press More to wrap back to 1st group of VOLTS options

Ampl = Amplitude HiLvl = High Level LoLvl = Low Level

Pol = Polarity SrcZ = Source Impedance LoadZ = Load Impedance ChAdd = Channel Add

I/V = Current or Voltage Limits = User programmable amplitude limits

Soft Keys (6)

Channel Ampl Offset HiLvl LoLvl More

Pulse Mode

Ch 1 Ampl

1000 mVpp

Trigger = PLL

1 Ampl

Offset HiLvl LoLvl Pol

1000 mVpp

0 mV

500 mV

-500 mV Norm

2 Ampl

Offset HiLvl LoLvl Pol

1000 mVpp

0 mV

500 mV

-500 mV Norm

CAUTION Observe the following precautions to maintain proper ventilation:

Keep the cooling vents from becoming blocked.

Do not position any devices adjacent to the instrument that force air (heated or unheated) into or onto its surfaces or cooling vents. This additional airflow could compromise accuracy performance.

When rack mounting the instrument, make sure there is adequate airflow around the rear and sides to ensure proper cooling. Adequate airflow enables air temperatures within approximately one inch of the instrument surfaces to remain within specified limits under all operating conditions.

Display

The Series 3400 uses an LCD display to view and set the various pulse/pattern parameters. The parameters that are displayed pertain to the selected menu. items for the VOLTS menu. The pulse output for these default parameter settings are shown in

Figure 1-1.

As shown, the More soft key is used to display all the various options for the VOLTS menu. All of the menus are summarized in

Table 2-1. For the Model 3402, the Channel soft key is used to

toggle between the two channels. Parameters are then set for the selected channel.

Figure 2-3 shows the default display

2-6 Return to Section Topics 3400S-900-01 Rev. B / January 2007

Figure 2-3

VOLTS menu options (default parameters)

The displays for the other menus (MODE, TIME, BURST, PATTERN, UTILITY, TRIGGER and HELP) are similar in structure to the VOLTS menu, but use different parameter options.

A summary for all the menus is provided in Table 2-1.

Series 3400 Pulse/Pattern Generators User’s Manual Section 2: Getting Started

Table 2-1

Menu summary

Menu Key Menu Item Description

MODE Pulse Select Pulse mode

Pattern Select Pattern mode Burst Select Burst mode ExtWidth External Width – Select External Width mode

VOLTS Channel 3402 only – Select channel

Ampl Amplitude – Set peak-to-peak amplitude Offset Set offset HiLvl High Level – Set high level LoLvl Low Level – Set low level Pol Polarity – Set polarity – Norm (normal) or Comp (complement) SrcZ Source Impedance – Select source impedance – 50 Ohms or 1k Ohms LoadZ Load Impedance – Set load impedance ChAdd Channel Add (3402 only) – Enable or Disable Channel Add I/V Current or Voltage – Select Current (I) or Voltage (V) output Limits Set and control (On/Off) high and low limits (Hi Volt, Lo Volt, Hi Cur and

Lo Cur)

PATTE RN Channel Select output channel or Strobe

Format Set format (RZ or NRZ) for selected channel Edit Change bit for to 0 or 1 (use “0”, “1” or “+” key) Length Set the number of bits of the pattern Bit # Select the bit to be edited PRBS n Set PRBS length by setting the “n” in formula 2n-1; n = 5 to 14. Block Edit pattern using Fill 0, Fill 1, Invert, Ins Bit and Del Bit Update Update pattern continuously (Cont) or when Now soft key is pressed

TRIGGER TrgSrc Trigger Source – Select trigger source: External input (ExtIn), PLL or

Manual

TrgMode Trigger Mode – Select trigger mode; Continuous (Cont), triggered

(Trig’d) or Gated TrgFreq Trigger Frequency – Set frequency for PLL trigger source TrgPer Trigger Period – Set period for PLL trigger source TrgSlope Trigger Slope – Set trigger slope; Pos, Neg or Both.

TIME Channel 3402 only – Select channel

Freq Frequency – Set pulse/pattern speed as frequency (Hz) Per Period – Set pulse/pattern speed as period (time) Width Set time for pulse width Delay Set delay time LeadE Leading Edge – Set transition time for leading edge TrailE Trailing Edge – Set transition time for trailing edge Double Enable (On) or disable (Off) double pulses per period PerSrc Period Source – Select period source – VCO, PLL or clock input (ClkIn)

BURST Brst Cnt Burst Count – Set burst count for Burst mode

3400S-900-01 Rev. B / January 2007 Return to Section Topics 2-7

Section 2: Getting Started Series 3400 Pulse/Pattern Generators User’s Manual

Table 2-1 (continued)

Menu summary

Menu Key Menu Item Description

UTILITY ClkIn Clock Input – Configure clock input – Termination (ClkInTrm; 50 Ohm

or 10 kOhm), slope (ClkInSlp; Pos or Neg) and threshold (ClkInThr) ExtIn External Input – Configure external input – Termination (ExtInTrm; 50

Ohm or 10 kOhm) and threshold (ExtInThr). Save Save instrument setup in memory – Save to Mem1 to Mem9. Recall Recall instrument setup from memory – Recall from Mem1 to Mem9, or

return to Default settings. PLLRef PLL Reference – Select Internal PLL or use Auto to check for PLL at

REF IN connector. System System settings for Display, Calibration (Cal), GPIB address

(GPIBAdd), IOPort (GPIB or USB) and Emulation (Emul).

HELP N/A Provides a brief description for the presently selected parameter (soft

key). Press any menu key or soft key to cancel help.

Editing parameter values and settings

NOTE For the Model 3402, the soft key for Channel toggles the display between Channel 1 and

Channel 2.

1. Select a menu (e.g. VOLTS). The menu keys are located next to the keypad.

2. Press the soft key for the parameter to be edited. Use the More key to display additional options. The parameter value or setting is displayed on the right side of the display.

3. Change a parameter value or setting as follows:

• Parameter value – If the parameter is a value, it can be changed using the rotary knob or the keypad.

Rotary Knob – The knob increments or decrements the value. Keypad – When keying in a value, the available ranges (e.g., mV, V) for the value will

appear at the bottom of the display. After keying in the value, use a soft key to select the range.

Cursor keys – Use to increment or decrement values.

• Parameter setting – For a parameter setting, options (e.g., Enable, Disable, Cancel, etc.) may appear on the bottom of the display and can be selected by pressing a soft key.

Additional soft keys for menu navigation will appear as needed:

Enter soft key – Use to enter the parameter setting or value.

Back soft key – Use to back up to the previous menu view.

Cancel soft key – Use to cancel a menu selection. Menu returns to the previous view.

Invalid entry error message

Trying to enter an invalid parameter setting will result in the following message in the upper righthand corner of the display:

Error, Press Help

Press the HELP menu key to display a message that explains the error. Press any key to cancel the help message.

2-8 Return to Section Topics 3400S-900-01 Rev. B / January 2007

Series 3400 Pulse/Pattern Generators User’s Manual Section 2: Getting Started

Defaults

The power-on defaults are listed in Table 2-2.

Table 2-2

Power-on defaults

Setting

Menu Parameter Setting or Value Menu Parameter

MODE Operating mode Pulse PATTERN Channel 1 TIME Channel 1 Format RZ

Frequency 1.000MHz Pattern Length 2 bits Period 1.000µs Update Cont Width 100.0ns PRBS Length 5 Delay 0.0ps UTILITY Clock Input: Leading Edge 2.5ns Clock Input Terminator 50Ω Trailing Edge 2.5ns Clock Input Slope Positive Double Pulse Off Clock Input Threshold 1.0V Period Source VCO External Input:

VOLTS Channel 1 External Input Terminator 50Ω

Amplitude 1000mVpp External Input Threshold 1.0V Offset 0mV PLL Reference Auto High Level 500mV System: Low Level -500mV Display: Polarity Normal Bright 8 Source Impedance 50Ω Contrast 6 Load Impedance 50Ω Timeout (in secs) 30 Channel Add (3402) Disabled GPIB Address* 10* I/V Voltage IOPort* GPIB* Limits Off, ± 500mV, ±10mA Emulation Mode Off

BURST Burst Count 2 bits TRIGGER Trigger Source ExtIn

Trigger Mode Cont Trigger Frequency 100kHz Trigger Period 10µs Trigger Slope Positive

* At the factory, the GPIB is selected as the remote programming interface and the address is set to 10. Changing the

interace or address is saved in NVRM, and will therefore be remembered on subsequent power-on. You must reboot

the instrument after changing any communication parameters to ensure that such parameters are applied.

or Value

3400S-900-01 Rev. B / January 2007 Return to Section Topics 2-9

Section 2: Getting Started Series 3400 Pulse/Pattern Generators User’s Manual

This page left blank intentionally.

2-10 Return to Section Topics 3400S-900-01 Rev. B / January 2007

In this section:

Top ic Page

Introduction .......................................................................................... 3-2

Out 1 and Out 2 connections ............................................................... 3-2

Trig Out and Ext In connections........................................................... 3-3

Strobe Out connection ......................................................................... 3-4

Clk In connections................................................................................ 3-4

Section 3

Signal Connections

Ref Out and Ref In connections ........................................................... 3-5

Section 3: Signal Connections Series 3400 Pulse/Pattern Generators User’s Manual

Out 1

DUT

Equivalent Circuit

BNC Cable

All Connectors: Female BNC

BNC Cable

All Connectors: Female BNC

BNC Cable

Out 1

Equivalent Circuit

DUT

Out 2

DUT

Connections to 2-Terminal Device:

Connections to 3-Terminal Device:

+/-

Introduction

For the Series 3400 Pulse/Pattern Generators front panel output option, signal connectors (except Ref Out and Ref In) are located on the front panel. For the rear panel output option, all connectors are on the rear panel to facilitate convenience for rack mounting. All signal connectors are female BNC.

Out 1 and Out 2 connections

Figure 3-1 shows how to connect an output channel of the Series 3400 to a 2-terminal DUT. It also

shows an example of using both channels of a Model 3402 to pulse the gate and drain of a fieldeffect transistor (FET).

Figure 3-1

Out 1 and Out 2 connections

3-2 Return to Section Topics 3400S-900-01 Rev. B / January 2007

Series 3400 Pulse/Pattern Generators User’s Manual Section 3: Signal Connections

BNC Cable

Trig Out

External Instrument

Ext In or Ext Trig or Trig In*

External Instrument can be one of the following:

· Scope being triggered to capture a waveform.

· Another Series 3400 being triggered to start Pulse, Burst, ExtWidth, or Pattern.

· Any other instrument being triggered to perform an operation.

* The actual label name

for the connector may be different.

+/-

BNC Cable

Ext In

External Instrument

Ext Out or Trig Out*

* The actual label name

for the connector may be different.

External Instrument can be one of the following:

· Scope triggering the Series 3400 to start Pulse, Burst, ExtWidth or Pattern.

· A second Series 3400 triggering the first Series 3400 to start Pulse, Burst,

ExtWidth, or Pattern.

· Any other instrument triggering the Series 3400 to start Pulse, Burst, ExtWidth, or Pattern.

+/-

Trig Out and Ext In connections

Figure 3-2 shows connections for Trig Out, and Figure 3-3 shows connections for Ext In. Trigger

output (Trig Out) marks each pulse or bit period (for Pattern mode). Trigger output is used to trigger an external instrument to start an operation (e.g., trigger scope to capture the waveform).

After an external instrument completes the operation, (e.g., waveform capture), it can send a trigger back to Ext In of the Series 3400 to output another pulse or bit. Using Trig Out and Ext In in this manner together allows for synchronized operation between two instruments. Refer to

Section 5 for details on triggering.

Figure 3-2

Trig Out connections

Figure 3-3

Ext In connections

3400S-900-01 Rev. B / January 2007 Return to Section Topics 3-3

Section 3: Signal Connections Series 3400 Pulse/Pattern Generators User’s Manual

BNC Cable

Strobe Out

External Instrument

Ext In or Trig In*

* The actual label name

for the connector may be different.

External Instrument can be one of the following:

· Scope being triggered to capture a waveform.

· Another Series 3400 being triggered to start Pulse, Burst, ExtWidth, or Pattern.

· Any other instrument being triggered to perform an operation.

+/-

BNC Cable

All Connectors: Female BNC

Clk In

External Instrument

* The actual label name for

the clock output connector may be different.

Ext Clk or Clk Out*

+/-

Strobe Out connection

Figure 3-4 shows the connections for Strobe Out. Strobe Out is available for the Burst and Pattern

modes. In Burst mode, strobe output marks the beginning and end of a burst. Strobe Out rises at the leading edge of the first pulse of the burst, and falls at the leading edge of the last pulse of the burst period. In Pattern mode, strobe output is bit programmable but is always NRZ format.

Strobe output is used to trigger an external instrument to start an operation (e.g., trigger scope to capture the waveforms). After the external instrument finishes its operation, it can then trigger the Series 3400 to start another burst or pattern, as shown in on triggering.

Figure 3-4

Strobe Out connections

Figure 3-3. Refer to Section 5 for details

Clk In connections

The period source can be provided by an external clock, as shown in Figure 3-5. Refer to

Section 5 for details on triggering.

Figure 3-5

Clk In connections

3-4 Return to Section Topics 3400S-900-01 Rev. B / January 2007

Series 3400 Pulse/Pattern Generators User’s Manual Section 3: Signal Connections

Ref Out

BNC Cable

Series 3400 Rear Panel Series 3400 Rear Panel

Ref In

Ref Out and Ref In connections

When using multiple Series 3400s in a test, the PLL reference of a single unit may be shared (made common to all units) by daisy-chaining the Ref Out of one unit to Ref In of another.

6 shows two units connected together for using the PLL reference of the first unit.

In a multi-unit system sharing a single PLL reference, all but one Series 3400 must be set for External PLL Reference (refer to "

PLL reference (PLLRef)" in Section 5). Note, when multiple units

share the same PLL reference, the frequencies of all of the units are synchronized.

Figure 3-6

Ref Out and Ref In connections

Figure 3-

3400S-900-01 Rev. B / January 2007 Return to Section Topics 3-5

Section 3: Signal Connections Series 3400 Pulse/Pattern Generators User’s Manual

This page left blank intentionally.

3-6 Return to Section Topics 3400S-900-01 Rev. B / January 2007

In this section:

Top ic Page

Pulse, Burst and External Width operation..................................... 4-3

Pattern operation............................................................................... 4-8

Saving and recalling setups ............................................................. 4-12

Pulse/pattern parameters.................................................................. 4-13

Section 4

Pulse/Pattern Generators Operation

Pulse mode ................................................................................... 4-4

Burst mode.................................................................................... 4-6

External Width mode..................................................................... 4-7

Saving a setup .............................................................................. 4-12

Recalling a setup........................................................................... 4-12

Returning to default settings ......................................................... 4-12

Ampl – amplitude .......................................................................... 4-13

Bit # ............................................................................................... 4-14

Block ............................................................................................. 4-14

Brst Cnt – burst count ................................................................... 4-14

Cal – calibration ............................................................................ 4-14

ChAdd (3402 only) – channel add................................................. 4-15

Channel......................................................................................... 4-15

ClkIn – clock input ......................................................................... 4-15

Delay ............................................................................................. 4-15

Display .......................................................................................... 4-16

Double........................................................................................... 4-16

Edit ................................................................................................ 4-16

Emul – emulation .......................................................................... 4-16

ExtIn – external input .................................................................... 4-17

Section 4: Pulse/Pattern Generators Operation Series 3400 Pulse/Pattern Generators User’s Manual

Top ic Page

Pulse/pattern parameters (continued): 4-13

Format ........................................................................................... 4-17

Freq – frequency ........................................................................... 4-17

GPIBAdd – GPIB address ............................................................. 4-17

Hi Cur – high current limit .............................................................. 4-17

HiLvl – high level ........................................................................... 4-18

Hi Volt – high voltage limit ............................................................. 4-18

IOPort – I/O port (interface) ........................................................... 4-18

I/V – current or voltage .................................................................. 4-18

LeadE – leading edge.................................................................... 4-18

Length............................................................................................ 4-19

LoadZ – load impedance ............................................................... 4-20

Lo Cur – low current limit............................................................... 4-21

LoLvl – low level ............................................................................ 4-21

Lo Volt – low voltage limit .............................................................. 4-21

Offset ............................................................................................. 4-21

On/Off (limits) ................................................................................ 4-22

Per – period ................................................................................... 4-22

PerSrc – period source.................................................................. 4-22

Pol – polarity.................................................................................. 4-23

PLLRef – PLL reference................................................................ 4-23

PRBS n – pseudo random bit sequence ....................................... 4-23

Recall............................................................................................. 4-24

Save .............................................................................................. 4-24

SrcZ – source impedance.............................................................. 4-24

System........................................................................................... 4-24

TrailE – trailing edge...................................................................... 4-24

TrgFreq – trigger frequency........................................................... 4-25

TrgMode – trigger mode ................................................................ 4-25

TrigPer – trigger period.................................................................. 4-25

TrgSlope – trigger slope ................................................................ 4-25

TrgSrc – trigger source.................................................................. 4-26

Update ........................................................................................... 4-26

Width ............................................................................................. 4-26

4-2 Return to Section Topics 3400S-900-01 Rev. B / January 2007

Series 3400 Pulse/Pattern Generators User’s Manual Section 4: Pulse/Pattern Generators Operation

Pulse Pattern Burst ExtWidth

Pulse Mode

Mode

Pulse

Trigger = PLL

Mode

A) Press the MODE key to select the MODE menu.

B) Press a Soft Key to select the desired operating

mode.

TRIGGER

TIME

VOLTS

BURST

PATTERN

UTILITY

HELP

MODE

Menu keys  Located next to the keypad.

MODE Menu

Soft Keys

Selected operating mode shown in this area of the display..

Pulse, Burst and External Width operation

NOTE For optimum performance, it is good practice to routinely perform self-calibration to

correct for internal zero drift due to changes in ambient temperature – Press UTILITY > Press System > Press Cal > Press Cal Now. For details, see

After making connections to the Series 3400 (refer to Section 3), the fundamental steps to operate Pulse, Burst and External Width are as follows:

1. Select the operating mode:

2. Configure the time and voltage parameters for the selected mode.

3. Configure triggering.

4. Enable the channel(s) and trigger the start of pulse output.

5. When finished, disable the output(s).

The two steps to select the operating mode are explained in Figure 4-1.

Figure 4-1

Select operating mode

Cal – calibration.

After selecting the operating mode, programmable parameters for that mode are set using the soft keys, rotary knob and the keypad and/or cursor keys. Details on the methods to edit parameter values and settings are provided on

Page 2-8.

NOTE Refer to “Pulse/pattern parameters” for details about the parameters. Each parameter is

listed alphabetically by its soft key name.

3400S-900-01 Rev. B / January 2007 Return to Section Topics 4-3

Section 4: Pulse/Pattern Generators Operation Series 3400 Pulse/Pattern Generators User’s Manual

A) Press the VOLTS key to select the VOLTS menu.

B) Use the Soft Keys, rotary knob and/or keypad to select

and set parameters.

C) Press the TIME key to select the TIME menu.

TRIGGER

TIME

VOLTS

BURST

PATTERN

UTILITY

HELP

MODE

Menu keys  Located next to the keypad.

1 Ampl

Offset HiLvl LoLvl Pol

1000 mVpp

0 mV

500 mV

-500 mV Norm

2 Ampl

Offset HiLvl LoLvl Pol

1000 mVpp

0 mV

500 mV

-500 mV Norm

Pulse Mode

Ch 1 Ampl

1000 mVpp

Trigger = PLL

VOLTS Menu

Soft Keys

Freq

1 Width

Delay LeadE TrailE

1.000 MHz

100.0 ns 0 ps

2.0 ns

Per

2 Width

Delay LeadE TrailE

1.000 µs

100.0 ns 0 ps

2.0 ns

Pulse Mode

Frequency

1.000 MHz

Trigger = PLL

TIME Menu

D) Again, use the Soft Keys, rotary knob and/or

keypad to select and set the parameters.

Soft Keys

NOTE

For the Keithley 3402, use the Channel Soft Key to toggle between Channel 1 and Channel 2 parameters.

Channel Ampl Offset HiLvl LoLvl More

Channel Freq Per Width Delay More

Pulse mode

1. Select the Pulse mode as explained in Figure 4-1.

2. Perform the steps in Figure 4-2 to configure the parameters in the VOLTS and TIME menus.

Figure 4-2

Configure Pulse mode parameters

3. Perform the steps in Figure 4-3 to configure triggering. Table 4-2 summarizes the trigger configurations. Refer to Section 5 for details on triggering.

4-4 Return to Section Topics 3400S-900-01 Rev. B / January 2007

Series 3400 Pulse/Pattern Generators User’s Manual Section 4: Pulse/Pattern Generators Operation

Pulse Mode

Trigger Source

PLL

Trigger = PLL

Trigger Parameters

TRIGGER Menu

Soft Keys

TrgSrc TrgMode TrgFreq TrgPer

PLL

Cont

100.0 kHz

10.00 µs

A) Press the TRIGGER key to select the TRIGGER menu.

B) Use the Soft Keys, rotary knob and/or keypad to select

and set the parameters.

TRIGGER

TIME

VOLTS

BURST

PATTERN

UTILITY

HELP

MODE

NOTE

With the Manual trigger source selected (TrgSrc = Manual), the ManTrg Soft Key will appear on the left side of the display.

The selected operating mode is indicated here: Pulse Mode, Burst Mode, Pattern Mode or ExtWidth Mode

Note There are additional trigger configuration settings

in the UTILITY menu (ClkIn, ExtIn and PLLRef).

TrgSlope

Pos

TrgSrc TrgMode TrgFreq TrgPer TrgSlope

Figure 4-3

Configure triggering

Table 4-1

Pulse mode triggering

Trigger effect on Pulse Mode output

TrgMode Tr gSrc PerSrc

Cont ExtIn or

Manual

VCO, PLL or ClkIn

Continuous pulse period output starts immediately.

Trig’d ExtIn N/A The active edge of an external trigger applied to the EXT IN connec-

tor triggers a single pulse period.

Manual N/A Pressing the ManTrg soft key triggers one single pulse period.

Gated ExtIn VCO, PLL,

ClkIn

The leading edge of an external trigger applied to the EXT IN connector triggers the first pulse period. The trailing edge trigger marks the last pulse period.

N/A = Not Applicable (setting is not significant).

(assuming channel already enabled)

4. Enable channel(s) by pressing the key(s) located next to the BNC output connector(s): CH1 Enable and CH2 Enable (3402 only). A green indicator light in the key turns on to indicate

that the channel is enabled. The enabled pulse output is triggered (output sequence started) according to the trigger

configuration.

5. When finished, disable the output(s) by again pressing the CH1 ENABLE and/or CH2 ENABLE (3402) keys. The green indicator light(s) turns off.

3400S-900-01 Rev. B / January 2007 Return to Section Topics 4-5

Section 4: Pulse/Pattern Generators Operation Series 3400 Pulse/Pattern Generators User’s Manual

TRIGGER

TIME

VOLTS

BURST

PATTERN

UTILITY

HELP

MODE

Menu keys located next to the keypad.

Burst Mode

Burst Count

Trigger = PLL

BURST Menu

A) Press the BURST key to select the BURSTmenu.

B) Press the Brst Cnt soft key, and use the rotary knob and/or

the keypad to specify the number of pulse periods.

Soft Keys

Burst Parameters

Brst Cnt

Burst mode

1. Select the Burst mode as explained in Figure 4-1.

2. Perform the steps in Figure 4-4 to set the Burst count. Burst count can be set from 2 to 65,536 pulse periods.

Figure 4-4

Setting Burst mode count

3. Perform the steps in Figure 4-3 to configure triggering. Table 4-2 summarizes the trigger configurations. Refer to Section 5 for details on triggering.

Table 4-2

Burst mode triggering

TrgMode Tr gSrc PerSrc

Cont N/A VCO, PLL

or ClkIn

Trig’d ExtIn VCO, PLL

or ClkIn

PLL VCO The internal VCO triggers each burst of pulse periods. The PLL trig-

Manual VCO, PLL

or ClkIn

Gated ExtIn VCO, PLL,

ClkIn

N/A = Not Applicable (setting is not significant).

4. Enable pulse output by pressing the channel enable key(s) located next to the BNC output connector(s): CH1 Enable and CH2 Enable (3402 only). The green indicator light in the key shows that the channel is enabled.

The enabled output is triggered (started) according to the trigger configuration.

5. When finished, disable the output(s) by again pressing the CH1 ENABLE and/or CH2

4-6 Return to Section Topics 3400S-900-01 Rev. B / January 2007

ENABLE (3402) keys. The green indicator light(s) turns off.

Trigger effect on Pulse Mode output

(assuming channel already enabled)

Burst pulse period output starts immediately. Each burst of pulse periods is repeated continuously. The active edge of an external trigger applied to the EXT IN connector triggers a single burst of pulse periods.

gers the burst. The VCO controls pulse period of each pulse/bit in the burst. Pressing the ManTrg soft key triggers a single burst of pulse periods. The edge of an external trigger applied to the EXT IN connector triggers the first burst of pulse periods. The trailing edge trigger marks the last burst of pulse periods.

Series 3400 Pulse/Pattern Generators User’s Manual Section 4: Pulse/Pattern Generators Operation

External Width mode

With the External Width mode selected (as explained in Figure 4-1), the rising and falling edges of an external trigger connected to the Trig In connector controls the output.

1. Select the ExtWidth mode as explained in Figure 4-1.

2. Time parameters for width, frequency, period and delay are determined by the external trigger signal and are not programmable.

3. Perform the steps in Figure 4-3 to configure triggering. Table 4-3 summarizes the trigger configuration. For external triggering (ExtIn), make sure to set the input termination and threshold voltage. These parameters are set using the ExtIn soft key from the UTILITY menu. Menu structure is shown in

The enabled output is triggered (started) according to the trigger configuration.

Table 4-3

External Width mode triggering

TrgMode Tr gSrc PerSrc

N/A ExtIn N/A The output pulse level follows the edges of an external trigger

applied to the EXT IN connector. A rising edge trigger causes the output to go high and a falling edge trigger causes the output to go low.

N/A = Not Applicable (setting is not significant).

Table 2-1. Refer to Section 5 for details on triggering.

Trigger effect on Pulse Mode output

(assuming channel already enabled)

5. When finished, disable the output(s) by again pressing the CH1 ENABLE and/or CH2 ENABLE (3402) keys. The green indicator light(s) turns off.

3400S-900-01 Rev. B / January 2007 Return to Section Topics 4-7

Section 4: Pulse/Pattern Generators Operation Series 3400 Pulse/Pattern Generators User’s Manual

PATTERN Menu

Soft Keys

Press the PATTERN key to select the PATTERN menu. Use the Soft Keys to configure the pattern.

TRIGGER

TIME

VOLTS

BURST

PATTERN

UTILITY

HELP

MODE

The 1, 0, or + keys edit values Length 2 Bit # 1 Ch 1 RZ 00 Ch 2 RZ 00 Strobe NRZ 00

PRBS n Block Update More

Press More Soft Key to display these additional Soft Key options

Channel Format Edit Length Bit # More

Pattern Mode

Pattern Length

Trigger = PLL

Pattern operation

NOTE For optimum performance, it is good practice to routinely perform self-calibration to

correct for internal zero drift due to changes in ambient temperature – Press UTILITY > Press System > Press Cal > Press Cal Now. For details, see

After making connections to the Series 3400 (refer to Section 5), the fundamental steps to operate the pulse/pattern generator are as follows:

Step 1) Select the Pattern operating mode: Step 2) Configure the parameters for the Pattern mode. Step 3) Configure triggering. Step 4) Enable the channel(s) and trigger the start of pattern output. Step 5) When finished, disable the outputs.

Step 1) Select Pattern mode

The Pattern mode is selected from the MODE menu. The two steps to select the Pattern mode are explained in

Figure 4-1.

Step 2) Pattern configuration

Cal – calibration.

NOTE Level and time parameters for pattern mode are configured via the TIME and VOLTS

keys. Refer to “

Figure 4-5 shows how to select the PATTERN menu. For the default menu, the cursors (grey

highlighting) are positioned on “Ch 1 RZ” and the first column of bits (all 0’s).

Figure 4-5

PATTERN menu

1. Use the Channel soft key to move the cursor to the desired channel: Ch 1, or Ch 2 (3402).

2. Use the Format soft key to toggle between the NRZ and RZ pattern format.

A) Select Format for Pattern

An output channel can be set for the NRZ or RZ format:

The pattern format for Strobe output is always NRZ and cannot be changed.

See “Pulse mode” on page 4-4 for more information. for details.

4-8 Return to Section Topics 3400S-900-01 Rev. B / January 2007

Series 3400 Pulse/Pattern Generators User’s Manual Section 4: Pulse/Pattern Generators Operation

Fill 0 Fill 1 Invert Ins Bit More Cancel

Del Bit Ins PRBS More Cancel

Press More Soft Key to display these additional Soft Key options

B) Set pattern Length

The length of a pattern can be set from 2 to 16,384 bits:

Press the Length soft key, and use the rotary knob or keypad to enter the pattern length. If using the keypad, key in the value and press the Enter soft key. All added bits to the pattern will be 0’s.

The set pattern length is the same for the output channel(s) and strobe output.

C) Edit bits as desired (0 or 1)

Each pattern bit for the selected channel (or Strobe output) can be set to 0 or 1:

1. Initially, the cursor will be located on the first bit. To change cursor position, press the Bit # soft key and use the rotary knob or the keypad to place the cursor on the bit to be changed.

2. Press the Edit soft key and press 0, 1 or +/- on the keypad to set the bit (the +/- key toggles the bit value). The cursor moves right to the next bit, which can then be changed in the same manner.

Advanced editing (Block)

The Block soft key (shown in Figure 4-5) can be used to edit a group of bits to 0s or 1s, or invert the bits within that group. A pattern bit can also be inserted or deleted.

Perform the following steps to edit a group of bits:

1. Use the Bit # soft key to position the cursor on the first bit to be edited (refer to step C1 above). That bit and all the bits to the right are edited as a group.

2. Press the Block soft key to display the soft key options shown in Figure 4-6:

– Press the Fill 1 soft key to set all bits in the group to 1. – Press the Fill 0 soft key to set all bits in the group to 0. – Press the Invert soft key to invert each bit within the group. A 1 becomes a 0, and a 0

becomes a 1.

Figure 4-6

Block soft key options

A bit in the pattern can be inserted or deleted (insertions and deletions do not change the length of the pattern). Press the Ins Bit soft key to insert a bit to right of the cursor. and press the Del Bit soft key to delete the bit at the present cursor position.

3400S-900-01 Rev. B / January 2007 Return to Section Topics 4-9

Section 4: Pulse/Pattern Generators Operation Series 3400 Pulse/Pattern Generators User’s Manual

Insert

1 1 1 0 0 1 1 0

Inserted bit

1 1 1 0 0 0 1 1 0

Original Bit Pattern:

(8-bits)

Extra bit is truncated

1 1 1 0 0 0 1 1 0

1 1 1 0 0 0 1 1

New Bit Pattern:

(8-bits)

Delete

1 1 1 0 0 1 1 0

1 1 1 0 1 1 0

Original Bit Pattern:

(8-bits)

0 bit added at end

1 1 1 0 1 1 0 0

New Bit Pattern:

(8-bits)

Insert Bit Delete Bit

Deleted bit

Figure 4-7 shows examples of the insert and delete process with the cursor on bit #4. After a bit is

inserted, the extra bit is truncated in order to maintain an 8-bit pattern. If bit #4 had been a 1, then a 1 would have been inserted. After a bit is deleted, an extra bit (0) is added to maintain an 8-bit pattern.

Figure 4-7

Insert bit and delete bit examples

1. Press the Update soft key shown in Figure 4-5. Two soft key options will then appear on the

2. Press the Cont soft key for continuos pattern update, or press Now when you are ready to

1. Select the format (RZ or NRZ) for the output pattern (refer to step A above).

2. Use the Length soft key to set an appropriate pattern length (refer to step B above). Keep in

3. Use the Bit # soft key to indicate the starting bit position for the random bit sequence.

4. Press the PRBS n soft key (shown in Figure 4-5).

5. Use the rotary knob or the keypad to set “n” for PRBS. If using the keypad, press the Enter

6. Press the Block soft key, and then press the Ins PRBS soft key to insert the random bit

4-10 Return to Section Topics 3400S-900-01 Rev. B / January 2007

Output Update

A pattern can be modified while it is available at an output. A pattern can be continuously updated as it is being modified, or the update can be performed as a separate action:

Pseudo random bit sequencer (PRBS)

PRBS is used to output a pseudo random pattern at the output. The bit length for the PRBS output pattern is determined by the binary sequence formula 2 user). The RZ or NRZ data format can be used for the PRBS pattern:

display: Now and Cont.

update the pattern.

-1, where n = 5 to 14 (which is set by the

mind that the length of the random bit sequence will not exceed the set pattern length. Any PRBS bits that exceed the pattern length are truncated.

soft key after keying in the value.

The displayed parameter value (5 to 14) is “n” for formula 2n-1. Table 4-4 shows the maxi- mum bit length for each “n” value of the formula. Again, the random bit sequence will not exceed the pattern length set in step 2.

sequence into the pattern.

Series 3400 Pulse/Pattern Generators User’s Manual Section 4: Pulse/Pattern Generators Operation

Table 4-4

PRBS length settings

PRBS Length

Setting

5 25 - 1 31 10 210 - 1 1,023

6 26 - 1 63 11 211 - 1 2,047

7 27 - 1 127 12 212 - 1 4,095

8 28 - 1 255 13 213 - 1 8,191

9 29 - 1 511 14 214 - 1 16,383

Length

Calculation

(# of bits)

Step 3) Configure triggering

Perform the steps in Figure 4-3 to configure triggering. Table 4-5 summarizes the trigger configurations. Refer to Section 5 for details on triggering.

Table 4-5

Pattern mode triggering

TrgMode Tr gSrc PerSrc

Cont N/A VCO, PLL

or ClkIn

Trig’d ExtIn VCO, PLL

or ClkIn

PLL VCO The internal VCO triggers each pattern of pulse periods. The PLL

Manual VCO, PLL

or ClkIn

Gated ExtIn VCO, PLL,

ClkIn

N/A = Not Applicable (setting is not significant).

Pattern pulse period output starts immediately. Each pattern of pulse periods is repeated continuously. The active edge of an external trigger applied to the EXT IN connector triggers a single pattern of pulse periods.

triggers the entire pattern. The VCO controls the individual pulse period. Pressing the ManTrg soft key triggers a single pattern of pulse periods. The leading edge of an external trigger applied to the EXT IN connector triggers the first pattern of pulse periods. The trailing edge trigger marks the last burst of pulse periods.

Length

PRBS Length

Setting

Trigger effect on Pulse Mode output

(assuming channel already enabled)

Length

Calculation

Length

(# of bits)

Step 4) Enable channel(s) and start pattern output

Enable pattern output by pressing the channel enable key(s) located next to the BNC output connector(s): CH1 Enable and CH2 Enable (3402 only). The green indicator light in the key shows that the channel is enabled.

The enabled output is triggered (started) according to the trigger configuration.

Step 5) Disable output(s)

When finished, disable the output(s) by again pressing the CH1 ENABLE and/or CH2 ENABLE (3402) keys. The green indicator light(s) turns off.

3400S-900-01 Rev. B / January 2007 Return to Section Topics 4-11

Section 4: Pulse/Pattern Generators Operation Series 3400 Pulse/Pattern Generators User’s Manual

Saving and recalling setups

The Series 3400 can save up to nine setups in non-volatile memory. In general, all the parameters for a setup are saved for later recall. For example, Mem1 may be a setup for Pulse mode, Mem2 may be a setup for Burst mode, Mem3 may be a setup for Pattern mode, and so on. The instrument can also be returned to the power-on default settings at any time.

Saving a setup

1. Configure the Series 3400 for the desired pulse/pattern operation.

2. Press the UTILITY menu key.

3. Press the SAVE soft key.

4. Save the setup to memory by pressing the appropriate soft key (Mem1 through Mem9).

Recalling a setup

1. Press the UTILITY menu key.

2. Press the Recall soft key.

3. Return the instrument to a saved setup by pressing the appropriate soft key (Mem1 through Mem9).

NOTE When the instrument returns to a saved or the default setup, the output(s) will disable.

Returning to default settings

1. Press the UTILITY menu key.

2. Press the Recall soft key.

3. Return the instrument to the default settings by pressing the Default soft key.

4-12 Return to Section Topics 3400S-900-01 Rev. B / January 2007

Series 3400 Pulse/Pattern Generators User’s Manual Section 4: Pulse/Pattern Generators Operation

Pulse/pattern parameters

As shown in Table 4-6, each parameter is listed alphabetically by its soft key name. Details follow the table that included applicable operating modes for the parameter and the menu where the parameter soft key is located.

Table 4-6

Soft key parameters

Parameter Parameter

Ampl – amplitude Limits Bit # LoadZ – load impedance Block Lo Cur – low current limit Brst Cnt – burst count LoLvl – low level Cal – calibration Lo Volt – low voltage limit ChAdd (3402 only) – channel add Offset Channel On/Off (limits) ClkIn – clock input Per – period Delay PerSrc – period source Display Pol – polarity Double PLLRef – PLL reference Edit PRBS n – pseudo random bit sequence Emul – emulation Recall ExtIn – external input Save Format SrcZ – source impedance Freq – frequency System GPIBAdd – GPIB address TrailE – trailing edge Hi Cur – high current limit TrgFreq – trigger frequency HiLvl – high level TrgMode – trigger mode Hi Volt – high voltage limit TrigPer – trigger period IOPort – I/O port (interface) TrgSlope – trigger slope I/V – current or voltage TrgSrc – trigger source LeadE – leading edge Update Length Width

Ampl – amplitude

Operating mode: All Menu: VOLTS

The low-to-high magnitude is the peak-to-peak amplitude of the pulse, and is calculated as follows:

Amplitude = |High Level| + |Low Level|

In Figure 1-1, amplitude is 1Vpp: |500mV| + |-500mV| = 1V.

Changing the amplitude will also change the high and low levels. Offset is not affected. For example, if the amplitude in low level will each decrease by 250mV (500mV / 2). The high level becomes 250mV and low level becomes -250mV.

The amplitude setting range is dependent on the selected source impedance (50Ω or 1kΩ) and the impedance of the load. Pulse amplitude can be independently set for each output channel of the Model 3402 Pulse/Pattern Generator.

Ampl setting range: 50Ω into 50Ω: 100mVpp to 10Vpp

3400S-900-01 Rev. B / January 2007 Return to Section Topics 4-13

Figure 1-1 is changed to 500mVpp, the magnitudes of the high and

2.0mApp to 200mApp

1kΩ into 50Ω: 200mVpp to 20Vpp

Section 4: Pulse/Pattern Generators Operation Series 3400 Pulse/Pattern Generators User’s Manual

4mApp to 400mApp

NOTE Low voltage and current settings may be affected by the resolution specifications of the

Series 3400. For example, setting an amplitude of 250mVpp with an offset of 0V will display HiLvl and LoLvl levels of +120mV and -120mV (instead of ±125mV). This is because the setting resolution is 10mV.

Bit #

Operating mode: Pattern Menu: PATTERN

The Bit # soft key is used to position the cursor on a bit that is to be edited. After pressing the Bit # soft key, use the rotary knob or keypad to place the cursor on the bit to be edited. The pattern

can then be edited using the

NOTE Refer to Step 2 of “See “Pattern operation” on page 4-8 for more information.

Edit soft key or the options of the Block soft key.

Block

Operating mode: Pattern Menu: PATTERN

Options of the Block soft key can be used to edit a group of pattern bits to 0s or 1s, or invert the bits within that group. A pattern bit can also be inserted or deleted.

NOTE Refer to “See “Advanced editing (Block)” on page 4-9 for more information.” for details on

using the Block soft key.

Brst Cnt – burst count

Operating mode: Burst Menu: BURST

Burst count specifies the number of pulse periods to output when a trigger event occurs.

Brst Cnt setting range: 2 to 65,536

Cal – calibration

Operating mode: All Menu: UTILITY (System)

The Series 3400 has a self-calibration feature to optimize performance. Self-calibration should be performed for the following conditions:

• Perform self-calibration after the Series 3400 is turned on and allowed to warm up for at least one hour.

• Perform self-calibration when the ambient temperature has changed.

• Perform self-calibration after an extended period of time since the last self-calibration.

NOTE Cables can be left connected to the Series 3400 when performing a self-calibration

Cal: Cal Now

4-14 Return to Section Topics 3400S-900-01 Rev. B / January 2007

Series 3400 Pulse/Pattern Generators User’s Manual Section 4: Pulse/Pattern Generators Operation

ChAdd (3402 only) – channel add

Operating mode: All Menu: VOLTS

When enabled, Channel Add is used to add the pulse output of Channel 1 to the pulse output of Channel 2. The complex result is available on Channel 1, and Channel 2 output is disabled.

With Channel Add enabled, changing the source and/or load impedance of either Channel 1 or Channel 2 will change the source and/or load impedance of the output.

ChAdd settings: Enable or Disable

Channel

Operating mode: All Menu: VOLTS, TIME and PATTERN

The Model 3402 has two channels. There are parameters that can be independently set for each channel.

For the Pulse, Burst and External Width modes, the Channel soft key toggles between Channel 1 and Channel 2. With Channel 1 selected, the display for Channel 1 settings is activated. With Channel 1 selected, the display for Channel 2 settings is activated.

In Pattern mode for the Model 3402, the Channel soft key is also used along with the Format soft key to set the pattern format for each channel.

3402 Channel settings: 1 or 2

ClkIn – clock input

Operating mode: Pulse, Burst and Pattern Menu: UTILITY

When using an external clock for pulse period generation, the terminator (input impedance of the Clkln connector terminal), slope and threshold voltage need to be set. The external clock is connected to the Clk In connector and the period source (PerSrc) is set for ClkIn.

Terminator – The clock input terminator setting needs to match the impedance of the external clock (50

Slope – Clock input can be set to detect the positive (Pos) or negative (Neg) slope of the external clock pulses.

Threshold – The threshold sets the trigger level (-3V to 3V) that will detected by the Series 3400 as a valid clock input pulse.

ClkIn settings: Terminator: 50Ω or 10kΩ

Ω or 10kΩ).

Slope: Pos or Neg Threshold: -3V to 3V

Delay

Operating mode: Pulse, Burst and Pattern (RZ only) Menu: TIME

After the programmed Trigger event occurs, pulsing will start after the programmed Delay period expires. Delay can be independently set for each output channel of the 3402 Pulse/Pattern Generator.

Delay setting range: 0s to (Period – 3.02ns)

3400S-900-01 Rev. B / January 2007 Return to Section Topics 4-15

Section 4: Pulse/Pattern Generators Operation Series 3400 Pulse/Pattern Generators User’s Manual

Display

Operating mode: All Menu: UTILITY (System)

There are display settings for brightness, contrast and timeout for the backlight. There are 10 settings each for brightness and contrast. Timeout is set in minutes. With timeout enabled (Entimeout = on) the backlight will turn off when the timeout period expires.

Bright and Contrast setting range: 1 to 10 EnTimeout: Off or On Timeout setting: Set in minutes

Double

Operating mode: Pulse and Burst Menu: TIME

Each channel can be set to output one or two pulses per period. With Double disabled (Off), the channel will output a single pulse per period. With Double enabled (On), each channel will output two pulses per period.

Double settings: Off or On

Edit

Operating mode: Pattern Menu: PATTERN

The Edit soft key is used with the Bit # soft key to change one or more bits of a pattern:

1. Press the Bit # soft key and use the rotary knob or the keypad to place the cursor on the bit to be changed.

2. Press the Edit soft key and then press the 0, 1 or +/- key to set the bit (+- toggles the bit value). The cursor moves right to the next bit, which can then be edited.

NOTE Refer to Step 2 of “See “Pattern operation” on page 4-8 for more information.” for details

on pattern configuration.

Emul – emulation

Operating mode: All Menu: UTILITY (System)

The emulation mode can be used to allow the Series 3400 to operate like the Agilent 81110A with the 81111A module installed. With emulation on, the *IDN? and *OPT? query commands will respond with messages that indicate that it is an Agilent 81110A with the 81111A module installed:

*IDN? response: “Hewlett-Packard, HP81110A” *OPT? response: 3401-“81111A”

3402-“8 1111 A , 8 1111A”

NOTE Emulation is provided for code compatibility only.

Emul settings: Off or On

NOTE Changing this setting requires a system reboot.

4-16 Return to Section Topics 3400S-900-01 Rev. B / January 2007

Series 3400 Pulse/Pattern Generators User’s Manual Section 4: Pulse/Pattern Generators Operation

ExtIn – external input

Operating mode: Pulse, Burst or Pattern Menu: UTILITY

For external triggering, the input impedance and threshold need to be set. The external trigger is connected to the Ext In connector and the trigger source (TrgSrc) is set for ExtIn.

Terminator – The terminator setting (input impedance) needs to match the impedance of the external trigger (50

Threshold – The threshold sets the trigger level (-3V to 3V) that will detected by the Series 3400 as a valid clock trigger pulse.

ExtIn settings: Terminator: 50Ω or 10kΩ

Ω or 10kΩ).

Threshold: -3V to 3V

Format

Operating mode: Pattern Menu: PATTERN

Bit patterns can be output in the RZ or NRZ format. The pattern can be individually set for each channel.

Format settings: RZ or NRZ

Freq – frequency

Operating mode: Pulse, Burst and Pattern Menu: TIME

Pulse speed can be set as frequency (Hz) or period (time). When setting the frequency, period is set according to the following calculation:

period = 1 / frequency

Refer to “Per – period” for details on setting pulse speed as time.

Freq setting range: 1mHz to 165MHz

GPIBAdd – GPIB address

Operating mode: All Menu: UTILITY (System)

The GPIB primary address of the Series 3400 can be set from 0 to 30. At the factory, the primary address is set to 10. The controller address is typically 0 or 21.

GPIBAdd setting range: 0 to 30

NOTE Changing this setting requires a system reboot.

Hi Cur – high current limit

Operating mode: All Menu: VOLTS

Refer to “Limits”

3400S-900-01 Rev. B / January 2007 Return to Section Topics 4-17

Section 4: Pulse/Pattern Generators Operation Series 3400 Pulse/Pattern Generators User’s Manual

HiLvl – high level

Operating mode: All Menu: VOLTS

Pulse high and low levels can be set. The pulse amplitude and offset will automatically adjust to correspond to the set high/low levels (refer to “

The high and low setting ranges are dependent on the selected source impedance (50Ω or 1kΩ) and the impedance of the load.

High and low levels can be independently set for each output channel of the Model 3402 Pulse/ Pattern Generator.

High/Low Level setting range*: 50Ω into 50Ω: 0 to ±10V

1kΩ into 50Ω: 0 to ±20V

* The low-to-high magnitude (which is the amplitude) cannot be set to exceed the following

window levels:

•50Ω source impedance, 50Ω load impedance: 10Vpp or 200mApp

•1kΩ source impedance, 50Ω load impedance: 20Vpp or 400mApp

Ampl – amplitude” and “Offset”).

0 to ±200mA

0 to ±400mA

Hi Volt – high voltage limit

Operating mode: All Menu: VOLTS

Refer to “Limits”

IOPort – I/O port (interface)

Operating mode: All Menu: UTILITY (System)

Remote programming for the Series 3400 can be performed using the GPIB or USB interface. At the factory, the GPIB interface is selected.

IOPort settings: GPIB or USB

NOTE Changing this setting requires a system reboot.

I/V – current or voltage

Operating mode: All Menu: VOLTS

Pulse levels can be set as voltage (V) or current (I).

I/V settings: Current or Voltage

LeadE – leading edge

Operating mode: All Menu: TIME

Transition times (leading edge and trailing edge) are the intervals between corresponding 10% and 90% amplitude points on the rising/falling edge of the pulse. The leading edge time and trailing edge time can be set independently for each output channel of the 3402 Pulse/Pattern

4-18 Return to Section Topics 3400S-900-01 Rev. B / January 2007

Series 3400 Pulse/Pattern Generators User’s Manual Section 4: Pulse/Pattern Generators Operation

Generator. Also, there are ranges on which transition times can be independently set. Refer to

Appendix A: Specifications for specific ranges.

Changing the leading edge time may also change the trailing edge time. Therefore, after changing the leading edge time, check the trailing edge time (refer to “ as needed.

LeadE setting range: 2ns to 200ms

TrailE – trailing edge“) and change it

Length

Operating mode: Pattern Menu: PATTERN

Sets the length (number of bits) of the pattern. Both channels are set to the same length.

Format settings: 2 to 16,384

NOTE Limits

Operating mode: All Menu: VOLTS

Each channel can be independently set for high and/or low limits (voltage and current). Limits restrict the user from programming amplitude, high level and low level beyond certain values. However, if the programmed load impedance (LoadZ) does not match the actual load impedance, then output voltages could exceed the programmed limits.

After pressing the Limits soft key, the following soft keys display. After selecting a limit, use the keypad or rotary knob to set the limit.

On/Off Hi Vol t Lo Vo l t Mo r e

On/Off – Use to turn limits on or off. Hi Volt – Use to set the high limit for voltage Lo Volt – Use to set the low limit for voltage

More – Use to display the following soft keys to set current limits:

Hi Cur Lo Cur

Hi Cur – Use to set the high limit for current Lo Cur – Use to set the low limit for current

Limits are only valid assuming correct programming of source and load impedance.

Limits settings: Hi Volt and Lo Volt, and Hi Cur and Lo Cur:

Same setting ranges as HiLvl and LoLvl

On/Off: Off or On

3400S-900-01 Rev. B / January 2007 Return to Section Topics 4-19

Section 4: Pulse/Pattern Generators Operation Series 3400 Pulse/Pattern Generators User’s Manual

1kW

Out

Series 3400 Pulse/Pattern Generator

Source Impedance (SrcZ) setting = 1kW

50W

Out

Series 3400 Pulse/Pattern Generator

Source Impedance (SrcZ) setting = 50W

DUT

SRC

DUT

IINT IINTIDUT IDUT

VDUT

ISRC

LoadZ – load impedance

Operating mode: All Menu: VOLTS

The Series 3400 specifications are rated for a source impedance of 50Ω or 1kΩ into a 50Ω load impedance (refer to “

For non-50Ω load impedances, the load impedance setting of the Series 3400 needs to be adjusted to match the actual impedance of the load in order for the output amplitude to match the programmed amplitude. For example, if the actual impedance of the DUT is 40 (LoadZ) needs to be set to 40

LoadZ setting range: 0.1Ω to 1MΩ

Figure 4-8 shows the simplified output diagrams for the two source impedance settings (50Ω and

1kΩ). With load impedance (LoadZ) set to 50Ω (default), the programmed voltage will be the actual voltage sourced to a 50

Figure 4-8

Series 3400 output diagrams

SrcZ – source impedance” to set source impedance).

Ω, load impedance

Ω.

Ω DUT.

Table 4-7 shows the actual sourced voltage for various DUT impedances. The programmed

voltage is 5V and load impedance (LoadZ) is set to 50Ω. For a 50Ω DUT, the programmed voltage (5V) will be sourced to the DUT. The voltage sourced to

the DUT increases as the actual impedance of the DUT increases. The voltage sourced to the DUT decreases as the actual impedance of the DUT decreases.

Changing the load impedance (LoadZ) setting increases or decreases the current (I compensate for a non-50

Ω load.

SRC

) to

With Channel Add (Model 3402 only) enabled, changing the source and/or load impedance of either Channel 1 or Channel 2 will change the source and/or load impedance of the output (refer to

ChAdd (3402 only) – channel add”).

“

Example

Assume you want to source 5V to a 40Ω load, and source impedance (SrcZ) and load impedance (LoadZ) are both set to 50

Ω (defaults).

As shown by the first row of data in Table 4-7, 4.44V (not 5V) will be sourced to the 40Ω DU T. To source 5V, set the load impedance to 40Ω. The current source (I force 125mA through the DUT (I

= 125ma x 40Ω = 5V

DUT

) will increase to 225mA to

SRC

4-20 Return to Section Topics 3400S-900-01 Rev. B / January 2007

Series 3400 Pulse/Pattern Generators User’s Manual Section 4: Pulse/Pattern Generators Operation

Table 4-7

Programmed voltage vs. actual voltage (V

) for DUT impedance variations

DUT

Prgm

Vol tag e

5V 50Ω 50Ω 40Ω 200mA 89mA 111m A 4.44V 5V 50Ω 50Ω 45Ω 200mA 95mA 105mA 4.74V 5V 50Ω 50Ω 50Ω 200mA 100mA 100mA 5.00V 5V 50Ω 50Ω 55Ω 200mA 105mA 95mA 5.24V 5V 50Ω 50Ω 60Ω 200mA 109mA 91mA 5.45V

5V 1kΩ 50Ω 40Ω 105mA 4mA 101mA 4.04V 5V 1kΩ 50Ω 45Ω 105mA 4.5mA 100.5mA 4.52V 5V 1kΩ 50Ω 50Ω 105mA 5mA 100mA 5.00V 5V 1kΩ 50Ω 55Ω 105mA 5.5mA 99.5mA 5.47V 5V 1kΩ 50Ω 60Ω 105mA 6mA 99mA 5.94V

* I

is the current through the internal Source Z.

INT

DUT

Prgm

Source Z

is the current through the external Load Z.

Prgm

Load Z

Lo Cur – low current limit

Operating mode: All Menu: VOLTS

Refer to “Limits”

LoLvl – low level

Actual

DUT Z I

SRC

INT

* I

DUT

* V

DUT

Operating mode: All Menu: VOLTS

Refer to “HiLvl – high level”

Lo Volt – low voltage limit

Operating mode: All Menu: VOLTS

Refer to “Limits”

Offset

Operating mode: All Menu: VOLTS

Offset is the median (average) value of the high and low pulse levels, and is calculated as follows:

Offset = (High Level + Low Level) / 2

Changing the offset will also change the high and low levels. Amplitude is not affected. For example, assume the following levels:

High Level: 1V Low Level: -1V Amplitude: 2Vpp |1V| + |-1V| = 2Vpp Offset: 0V (1V + -1V) / 2 = 0V

If offset is changed to 0.5V, amplitude will remain at 2Vpp but the high and low levels will shift up (increase) by 0.5V. The high level becomes 01.5V (1V + 0.5V) and the low level becomes -0.5V (-1V + 0.5V).

3400S-900-01 Rev. B / January 2007 Return to Section Topics 4-21

Section 4: Pulse/Pattern Generators Operation Series 3400 Pulse/Pattern Generators User’s Manual

The offset can be set to any value that allows the pulse to fit within the level window. Keep in mind that minimum amplitude is 100mVpp. For a 100mVpp amplitude, offset can be programmed up to

9.95V.

NOTE Low voltage and current settings may be affected by the resolution specifications of the

On/Off (limits)

Operating mode: All Menu: VOLTS

Refer to “Limits”

Per – period

Operating mode: Pulse, Burst and Pattern Menu: TIME

Pulse speed can be set as period (interval at which the pulse repeats) or frequency. When setting the period, frequency is set according to the following calculation:

frequency = 1 / period

Refer to “Freq – frequency” for details on setting pulse speed as frequency.

Per setting range: 6.06ns to 1000s

PerSrc – period source

Operating mode: Pulse, Burst and Pattern Menu: TIME

There are two internal period sources that can be used for period generation: PLL or VCO. The the trigger speed for the internal PLL is adjustable, and can be set as frequency (refer to “

trigger frequency”) or period (refer to “TrigPer – trigger period”). The PLL period source and PLL

trigger source cannot be used cannot be used together at the same time.

An external period source connected to the Clk In connector can be used instead of an internal period source.

PerSrc settings: VCO, PLL or ClkIn

TrgFreq –

4-22 Return to Section Topics 3400S-900-01 Rev. B / January 2007

Series 3400 Pulse/Pattern Generators User’s Manual Section 4: Pulse/Pattern Generators Operation

Period

Norm

Comp

Polarity

Pol – polarity

Operating mode: All Menu: VOLTS

With normal polarity (Norm) selected, pulses/patterns are output from low level to high level as depicted In level to low level:

Figure 4-9

Polarity

Figure 4-9. With complement (Comp) selected, pulses/patterns are output from high

Pol settings: Norm or Comp

PLLRef – PLL reference

Operating mode: Pulse, Burst and Pattern Menu: UTILITY

PLLRef – The PLLRef soft key (accessed from the UTILITY menu) is used to select the following

options for multiple Series 3400 units that are daisy-chained using the Ref Out and Ref In connectors:

• External - The Series 3400 uses the externally supplied signal as the reference for the PLL.

• Internal – The Series 3400 will use its internal frequency reference source for the PLL.

PLLRef settings: External or Internal

PRBS n – pseudo random bit sequence

Operating mode: Pattern Menu: PATTERN

The length (number of bits) for the pseudo random bit sequence (PRBS) is determined by “n” in the following equation: 2 PRBS for each “n” setting.

PRBS n settings: n = 5 to 14

-1, where n can be set from 5 to 14. Table 4-4 lists the length of the

3400S-900-01 Rev. B / January 2007 Return to Section Topics 4-23

Section 4: Pulse/Pattern Generators Operation Series 3400 Pulse/Pattern Generators User’s Manual

Recall

Operating mode: All Menu: Utility

Up to nine instrument setups can be saved in memory (refer to “Save”). An instrument setup can be restored to a saved setup using the Recall soft key.

After pressing the Recall soft key, select the memory location of the saved setup. The instrument will return to that setup. The instrument can also be returned to the default settings.

Recall options: Default, Mem1, Mem2, Mem3, Mem4, Mem5, Mem6, Mem7, Mem8 or Mem9

Save

Operating mode: All Menu: Utility

Up to nine instrument setups can be saved in memory. After configuring the instrument as desired, use the Save soft key to save the setup to one of the nine memory locations.

Use the Recall soft key to return the instrument to a saved setup (refer to “Recall”).

Save options: Mem1, Mem2, Mem3, Mem4, Mem5, Mem6, Mem7, Mem8, Mem9

SrcZ – source impedance

Operating mode: All Menu: VOLTS

The Series 3400 specifications are rated for a source impedance of 50Ω or 1kΩ into a 50Ω load impedance.

Refer to “LoadZ – load impedance” for details on load impedance and source impedance.

SrcZ settings: 50 Ohms or 1 kOhms

System

Operating mode: All Menu: UTILITY

The System soft key displays the following soft key options for system based operations: Refer to “Display” Refer to “Cal – calibration” Refer to “GPIBAdd – GPIB address” Refer to “IOPort – I/O port (interface)” Refer to “Emul – emulation”

TrailE – trailing edge

Operating mode: All Menu: TIME

4-24 Return to Section Topics 3400S-900-01 Rev. B / January 2007

Series 3400 Pulse/Pattern Generators User’s Manual Section 4: Pulse/Pattern Generators Operation

Changing the trailing edge time may also change the leading edge time. Therefore, after changing the trailing edge time, check the leading edge time (refer to “ as needed.

TrailE setting range: 2ns to 200ms

LeadE – leading edge“) and change it

TrgFreq – trigger frequency

Operating mode: Pulse, Burst and Pattern Menu: TRIGGER

Sets the frequency of the PLL trigger source. When setting the trigger frequency, trigger period (time) is set according to the following calculation:

trigger period = 1 / trigger frequency

Refer to “TrigPer – trigger period” for details on setting trigger speed as time.

TrgFreq setting range: 1mHz to 165MHz

TrgMode – trigger mode

Operating mode: Pulse, Burst and Pattern Menu: TRIGGER

Sets the trigger mode: Continuous, triggered or gated.

Continuous – For continuous (Cont), continuous pulse output starts when the channel is enabled.

Tri ggered – For triggered (Trig’d), the trigger source (TrgSrc) triggers a single pulse period, or a

burst of pulse periods, or a pattern of bits (periods).

Gated – For Gated, the leading edge of an external trigger (ExtIn) triggers the first pulse, burst or pattern of pulse periods. The trailing edge trigger marks the last pulse, burst or pattern of pulse periods

TrgMode settings: Cont, Trig’d or Gated

TrigPer – trigger period

Operating mode: Pulse, Burst and Pattern Menu: TRIGGER

Sets the period (time) of the PLL trigger source. When setting the trigger frequency (Hz), trigger period is set according to the following calculation:

trigger frequency = 1 / trigger period

Refer to “TrgFreq – trigger frequency” for details on setting trigger speed as frequency.

TrigPer setting range: 6.06ns to 1000s

TrgSlope – trigger slope

Operating mode: Pulse, Burst and Pattern Menu: TRIGGER

With the ExtIn or PLL trigger source selected, the positive-edge, negative-edge (or both) of the source will trigger a pulse/pattern period.

TrgSlope settings: Pos, Neg or Both

3400S-900-01 Rev. B / January 2007 Return to Section Topics 4-25

Section 4: Pulse/Pattern Generators Operation Series 3400 Pulse/Pattern Generators User’s Manual

TrgSrc – trigger source

Operating mode: Pulse, Burst and Pattern Menu: TRIGGER

For non-continuous operation, pulsing is controlled by a trigger source: External, PLL or Manual.

External – For external triggering (ExtIn), the external trigger source is connected to the Ext In connector.

PLL – For internal triggering, the PLL is used for triggering. Note that the PLL period source (PerSrc) and PLL trigger source (TrgSrc) cannot be used together.

Manual – For manual triggering (Manual), a trigger is generated when the ManTrg soft key is pressed.

TrgSrc settings: ExtIn, PLL or Manual

Update

Operating mode: Pattern Menu: PATTERN

A pattern can be edited while it is being sourced. With continuous (Cont) updating, the output pattern will update immediately when it is changed. Otherwise, the pattern will not update until the

Now soft key is pressed.

Width

Update settings: Now or Cont

Operating mode: Pulse, Burst and Pattern (RZ only) Menu: TIME

Pulse width is the interval between leading-edge and trailing-edge medians. The median is the 50% level of the amplitude. Pulse width can be independently set for each output channel of the 3402 Pulse/Pattern Generator.

Width setting range: 3.02ns to (Period – 3.02ns)

4-26 Return to Section Topics 3400S-900-01 Rev. B / January 2007

In this section:

Top ic Page

Triggering overview........................................................................... 5-2

Section 5

Triggering

Double pulse ................................................................................. 5-2

Period source (PerSrc).................................................................. 5-2

Trigger source (TrgSrc) ................................................................. 5-3

Trigger Out and Strobe Out........................................................... 5-3

PLL reference (PLLRef) ................................................................ 5-3

Continuous......................................................................................... 5-4

Continuous Pulse mode ................................................................ 5-4

Continuous Burst mode................................................................. 5-4

Continuous Pattern mode ............................................................. 5-5

Trigg ere d ............................................................................................ 5-6

Triggered Pulse mode................................................................... 5-6

Triggered Burst mode.................................................................... 5-8

Triggered Pattern mode ................................................................ 5-10

Gated .................................................................................................. 5-13

Gated Pulse mode ........................................................................ 5-13

Gated Burst mode ......................................................................... 5-14

Gated Pattern mode...................................................................... 5-16

External Width.................................................................................... 5-17

User Interface and remote programming mapping ........................ 5-18

Section 5: Triggering Series 3400 Pulse/Pattern Generators User’s Manual

Triggering overview

The Series 3400 has three triggering modes for Pulse, Burst and Pattern: Continuous, Triggered and Gated. For the External Width mode, triggering is controlled by an external trigger. summarizes the triggering capability of the Series 3400.

NOTE Timing diagrams are used throughout this section to show the relationship between the

trigger signals and the channel output(s).

Table 5-1

Triggering summary

TrgMode: Continuous (Cont) Triggered (Trig’d) Gated N/A

Table 5-1

Operating Mode

Double pulse:

PerSrc: VCO, PLL or ClkIn N/A

TrgSrc: N/A

Trig Out: Marks each pulse period or bit period

Strobe

Out

1) For Pulse and Burst, output (PulseNum) can be single or double pulses. For Pattern, bit output format can be NZ or NRZ.

2) N/A = Not Applicable (setting not significant).

3) PLL cannot be used as the period source (PerSrc) and trigger source (TrgSrc) at the same time.

4) Strobe Out:

Pulse – Not used. Burst – Goes high when first pulse of burst is triggered. Goes low when last pulse is triggered. Pattern – Bit pattern programmed by the user. ExtWidth – Not used.

Pulse Burst Pattern Pulse Burst Pattern Pulse Burst Pattern ExtWidth

Single or Double N/A

— 1st and

last

Bit

Pattern

Single or Double N/A2Single or Double N/A

ExtIn or

Manual

— 1st and

VCO, PLL3 or

ClkIn

ExtIn, PLL3 or

Manual

Bit

last

Pattern

VCO, PLL3 or ClkIn N/A

ExtIn ExtIn

— 1st and

last

Pattern

Bit

—

Double pulse

The Series 3400 can be set for Single or Double pulse output. For Single, a channel will output one pulse per period. For Double, a channel will output two pulses per period.

The pulse number is set from the Double soft key (accessed from the TIME menu). From this menu select Single or Double.

Period source (PerSrc)

The Series 3400 can use one of two internal period sources (VCO or PLL), or an external clock (ClkIn) for pulse period generation. The PerSrc soft key (accessed from the TIME menu) is used select and configure the period source:

PLL and VCO – The PLL is more accurate than the VCO, but the VCO is more precisely triggered (startable). See specifications for accuracy differences. The PLL period source and the PLL trigger source (TrgSrc) cannot be used at the same time.

ClkIn – The external clock signal (connected to Clk In) can be ±6V. Series 3400 settings for an external clock include the following:

5-2 Return to Section Topics 3400S-900-01 Rev. B / January 2007

Series 3400 Pulse/Pattern Generators User’s Manual Section 5: Triggering

• Input impedance (ClkInTerm): 50Ω or 10kΩ

• Slope (ClkInSlp): Pos or Neg

• Threshold (ClkInThr): -3V to +3V

Trigger source (TrgSrc)

For non-continuous triggering, Pulse, Burst or Pattern output can be controlled by external triggering (ExtIn), the Manual soft key (Manual) or the internal PLL. The TrgSrc soft key (accessed from the TRIGGER menu) is used select and configure the trigger source:

ExtIn – The external trigger (connected to Ext In) can be ±6V. Series 3400 settings for an external trigger include the following:

• Input impedance (ExtInTrm): 50Ω or 10kΩ (UTILITY menu)

• Threshold (ExtInThr): -3V to +3V (UTILITY menu)

Manual – When Manual is selected as the trigger source and TrgMode = Trig’d, the ManTrg soft key appears on the display. It is used to control triggering.

PLL – After PLL is selected as the trigger source, the trigger period (TrgPer) can be set from

6.06ns to 1000s. When set as frequency (TrgFreq), it can be set from 1mHz to 165MHz.

Trigger slope (TrgSlope) – With the ExtIn or PLL trigger source selected, the positive-edge, negative-edge (or both) of the source will trigger a pulse/pattern period. Trigger slope can be set for Pos, Neg or Both. The TrgSlope soft key is accessed from the TRIGGER menu.

Trigger Out and Strobe Out

Trigger Out is available for all operating modes and marks each pulse or bit. Each output trigger sent to an external instrument triggers it to perform an operation. If the external instrument is a scope, a waveform capture will be performed. If the external instrument is another Series 3400, a Pulse, Burst or Pattern will be started.

Strobe Out is available in Burst mode and marks the first pulse and last pulse of each burst. It is similar to Trigger Out, but will trigger the external instrument to start an operation when the last pulse of the burst has started. Strobe Out is also available in Pattern mode and is bit programmable by the user.

Trig Out and Strobe Out provide TTL (0V/2.4V) levels that have a 50Ω output impedance.

PLL reference (PLLRef)

When using multiple Series 3400s in a test system, the PLL in one Series 3400 can be used by all the other Series 3400 units. Using one PLL provides synchronized period source generation for all the units in the test system:

PLLRef – The PLLRef soft key (accessed from the UTILITY menu) is used to select the following options:

• External - The series 3400 uses the externally supplied signal as the reference for the PLL.

• Internal – The Series 3400 will use its internal frequency reference source for the internal PLL.

Ref In and Ref Out connectors – When using multiple Series 3400s in a test, the PLL reference of a single unit may be shared (made common to all units) by daisy-chaining the Ref Out of one unit to Ref In of another. reference of the first unit.

3400S-900-01 Rev. B / January 2007 Return to Section Topics 5-3

Figure 3-6 shows two units connected together for using the PLL

Section 5: Triggering Series 3400 Pulse/Pattern Generators User’s Manual

Period Source

(PerSrc)

VCO, PLL or ClkIn

Period

Out 1

Trig Out

Out 2

Period Period

Continuous

In the continuous trigger mode, output starts immediately as soon as a channel is enabled, and continues until the channel is disabled.

Continuous Pulse mode

Timing for the continuous Pulse mode is shown in Figure 5-1:

Period Source – Pulse output is synchronized to the selected period source: VCO, PLL or Clk In.

Trig Out – A TTL level pulse is generated for every pulse period.

Figure 5-1

Continuous Pulse mode

5-4 Return to Section Topics 3400S-900-01 Rev. B / January 2007

Continuous Burst mode

Timing for the continuous Burst mode is shown in Figure 5-2:

Period Source – Pulse output is synchronized to the selected period source: VCO, PLL or Clk In.

Trig Out – A TTL level pulse is generated for every pulse period.

Strobe Out – TTL level goes high at the start of the first pulse period for the burst, and goes low at

the start of the last pulse period.

Series 3400 Pulse/Pattern Generators User’s Manual Section 5: Triggering

Period

Out 1

Trig Out

Out 2

Period Period

Strobe Out

3-Period Burst

(Brst Cnt = 3)

Period Source

(PerSrc)

VCO, PLL or ClkIn

Figure 5-2

Continuous Burst mode

Continuous Pattern mode

Timing for the continuous Pattern mode is shown in Figure 5-3:

Period Source – Bit output is synchronized to the selected period source: VCO, PLL or Clk In.

Trig Out – A TTL level pulse is generated for every bit (period).

Strobe Out – TTL level output that is bit-programmable using the NRZ format.

3400S-900-01 Rev. B / January 2007 Return to Section Topics 5-5

Section 5: Triggering Series 3400 Pulse/Pattern Generators User’s Manual

Period

(Bit)

Out 1

(RZ)

Trig Out

Out 2

(NRZ)

Period

(Bit)

Period

(Bit)

Strobe Out

3-Bit Pattern

(Length = 3)

11 0

01 1

11 0

Period Source

(PerSrc)

VCO, PLL or ClkIn

Figure 5-3

Continuous Pattern mode

Triggered

In triggered, an enabled channel output is controlled by a trigger source. Each trigger will start a single Pulse, Burst or Pattern.

Triggered Pulse mode

Timing for the triggered Pulse mode is shown in Figure 5-4, Figure 5-5, and Figure 5-6.

Trigger Source – A single pulse period is triggered by an external trigger (ExtIn), the internal PLL, or by pressing the Manual soft key (Manual):

• ExtIn – A pulse period is started by the active edge of an external trigger connected to the Ext In connector. The active edge could be the positive (Pos) slope of the trigger source

Figure 5-4), the negative (Neg) slope (Figure 5-5) or Both (Figure 5-6).

(

• PLL – Each positive slope edge of the internal PLL triggers a pulse period (refer to Figure 5-

4). The trigger period (TrgPer) can be set from 6.06ns to 1000s. When set as frequency

(TrgFreq), it can be set from 1mHz to 165MHz.

• Manual – When the Manual trigger source is selected and TrgMode = Trig’d, the ManTrg soft key appears on the display. Pressing this soft key starts a single pulse period.

Trig Out – A TTL level pulse is generated for every pulse period.

5-6 Return to Section Topics 3400S-900-01 Rev. B / January 2007

Series 3400 Pulse/Pattern Generators User’s Manual Section 5: Triggering

Out 1

Trig Out

Out 2

Trigger Source

(TrgSrc)

ExtIn, PLL

or Manual

Each pulse triggered by the positive slope edge of an external trigger or internal PLL, or when the Manual Soft Key is pressed.

Positive Slope Trigger Edge (For ExtIn, ExtInSlp = Pos)

Out 1

Trig Out

Out 2

Trigger Source

(TrgSrc)

ExtIn or Manual

Each pulse triggered by the negative slope edge of an external trigger, or when the Manual Soft Key is pressed.

Negative Slope Trigger Edge (For ExtIn, ExtInSlp = Neg)

Figure 5-4

Triggered Pulse mode (positive slope)

Figure 5-5

Triggered Pulse mode (negative slope)

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Section 5: Triggering Series 3400 Pulse/Pattern Generators User’s Manual

Out 1

Trig Out

Out 2

Trigger Source

(TrgSrc)

ExtIn or Manual

Positive and Negative Slope Trigger Edges (For ExtIn, ExtInSlp = Both)

Each pulse triggered by both positive and negative slope edges of an external trigger, or when the Manual Soft Key is pressed.

Figure 5-6

Triggered Pulse mode (positive and negative slope)

Triggered Burst mode

Timing for the triggered Burst mode is shown in Figure 5-7 (VCO period source) and Figure 5-8 (PLL or ClkIn period source). Note in Figure 5-8 that the PLL and ClkIn period sources are not synchronized to the external trigger source (ExtIn). The delay between trigger and start of the period is calculated as follows:

Delay = n x Period where, 1 < n ≤ 2

Trigger Source – A single burst of pulse periods is triggered by an external trigger (ExtIn), the internal PLL or by pressing the Manual soft key (Manual):

• ExtIn – A burst of pulse periods is started by the active edge of an external trigger connected to the Ext In connector. The active edge could be the positive (Pos) slope of the trigger source, the negative (Neg) slope or Both.

• PLL – Each positive slope edge of the internal PLL triggers a burst of pulse periods. The trigger period (TrgPer) can be set from 6.06ns to 1000s. When set as frequency (TrgFreq), it can be set from 1mHz to 165MHz. Note that the PLL trigger source and PLL period source cannot be used at the same time.

• Manual – When the Manual trigger source is selected and TrgMode = Trig’d, the ManTrg soft key appears on the display. Pressing this soft key starts a single burst of pulse periods.

Period Source – Pulse output is synchronized to the selected period source: VCO, PLL or Clk In. Note that the PLL period source and PLL trigger source cannot be used at the same time.

Trig Out – A TTL level pulse is generated for every pulse period.

Strobe Out – TTL level goes high at the start of the first pulse period of the burst, and goes low at

the start of the last pulse period.

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Series 3400 Pulse/Pattern Generators User’s Manual Section 5: Triggering

Period

Out 1

Trig Out

Out 2

Period Period

Strobe Out

3-Period Burst

(Brst Cnt = 3)

Period Source

(PerSrc)

VCO

Trigger Source

(TrgSrc)

ExtIn, Manual

or PLL

First period of

next burst

Figure 5-7

Triggered Burst mode (VCO period source)

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Section 5: Triggering Series 3400 Pulse/Pattern Generators User’s Manual

Period

Out 1

Trig Out

Out 2

Period Period

Strobe Out

3-Period Burst

(Brst Cnt = 3)

Period Source

(PerSrc)

PLL or ClkIn

Trigger Source

(TrgSrc)

ExtIn or Manual

First period of

next burst

PLL/ClkIn not synchronized to ExtIn.

Figure 5-8

Triggered Burst mode (PLL or ClkIn period source)

Triggered Pattern mode

Timing for the triggered Pattern mode is shown in Figure 5-9 (VCO period source) and Figure 5-10 (PLL or ClkIn period source). Note in Figure 5-10 that the PLL and ClkIn period sources are not synchronized to the external trigger source (ExtIn). The delay between trigger and start of the period is calculated as follows:

Delay = n x Period where, 1 < n ≤ 2

Trigger Source – A single pattern of bits (periods) is triggered by an external trigger (ExtIn), the internal PLL or by pressing the Manual soft key (Manual):

Period Source – Pattern output is synchronized to the selected period source: VCO, PLL or Clk In. Note that the PLL period source and PLL trigger source cannot be used at the same time.

Trig Out – A TTL level pulse is generated for every pulse period.

Strobe Out – TTL level output that is bit-programmable using the NRZ format.

• ExtIn – A pattern of bit periods is started by the active edge of an external trigger connected to the Ext In connector. The active edge could be the positive (Pos) slope of the trigger source, the negative (Neg) slope or Both.

• PLL – Each positive slope edge of the internal PLL triggers a pattern of bits. The trigger period (TrgPer) can be set from 6.06ns to 1000s. When set as frequency (TrgFreq), it can be set from 1mHz to 165MHz. Note that the PLL trigger source and PLL period source cannot be used at the same time.

• Manual – When the Manual trigger source is selected, the Manual soft key appears on the display. Pressing this soft key starts a single pattern of bits.

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Series 3400 Pulse/Pattern Generators User’s Manual Section 5: Triggering

Period

(Bit

Out 1

Trig Out

Out 2

Period

(Bit)

Period

(Bit)

Strobe Out

3-Bit Pattern

(Length = 3)

Period Source

(PerSrc)

VCO

Trigger Source

(TrgSrc)

ExtIn, Manual

or PLL

First bit of

next pattern

11 0 1

0 011

11 10

Figure 5-9

Triggered Pattern mode (VCO period source)

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Section 5: Triggering Series 3400 Pulse/Pattern Generators User’s Manual

Period

(Bit)

Out 1

Trig Out

Out 2

Period

(Bit)

Period

(Bit)

Strobe Out

3-Bit Pattern

(Length = 3)

Period Source

(PerSrc)

PLL or ClkIn

Trigger Source

(TrgSrc)

ExtIn or Manual

First bit of

next pattern

11 0

0011

11 10

PLL/ClkIn not synchronized to ExtIn.

Figure 5-10

Triggered Pattern mode (PLL or ClkIn period source)

5-12 Return to Section Topics 3400S-900-01 Rev. B / January 2007

Series 3400 Pulse/Pattern Generators User’s Manual Section 5: Triggering

Period

Out 1

Trig Out

Out 2

Period Period

Period Source

(PerSrc)

VCO

Trigger Source

(TrgSrc)

ExtIn

Period

Gated

In the gated trigger mode, an enabled channel output is controlled by the leading and trailing edge on an external trigger.

Gated Pulse mode

Timing for the gated Pulse mode is shown in Figure 5-11 (VCO period source) and Figure 5-12 (PLL or ClkIn period source). Note in Figure 5-12 that the PLL and ClkIn period sources are not synchronized to the external trigger source (ExtIn). The delay between trigger and start of the period is calculated as follows:

Delay = n x Period where, 1 < n ≤ 2

Trigger Source – Pulse periods start when the rising edge of an external trigger (ExtIn) is detected. The falling edge of the trigger marks the last pulse period. In

12, three pulse periods are started by each gated trigger.

Period Source – Pulse output is synchronized to the selected period source: VCO, PLL or Clk In.

Trig Out – A TTL level pulse is generated for every pulse period.

Figure 5-11

Gated Pulse mode (VCO period source)

Figure 5-11 and Figure 5-

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Section 5: Triggering Series 3400 Pulse/Pattern Generators User’s Manual

Period

Out 1

Trig Out

Out 2

Period Period

Period Source

(PerSrc)

PLL or ClkIn

Trigger Source

(TrgSrc)

ExtIn

Period

PLL/ClkIn not synchronized to ExtIn.

Figure 5-12

Gated Pulse mode (PLL or ClkIn period source)

Gated Burst mode

Timing for the gated Burst mode is shown in Figure 5-13 (VCO period source) and Figure 5-14 (PLL or ClkIn period source). Note in Figure 5-14 that the PLL and ClkIn period sources are not synchronized to the external trigger source (ExtIn). The delay between trigger and start of the period is calculated as follows:

Delay = n x Period where, 1 < n ≤ 2

Tri gger Sou rce – Pulse periods for a burst start when the rising edge of an external trigger (ExtIn) is detected. The falling edge of the trigger marks the last burst. In Burst count is 2. Two 3-period bursts are started by each gated trigger.

Period Source – Pulse output is synchronized to the selected period source: VCO, PLL or Clk In.

Trig Out – A TTL level pulse is generated for every pulse period.

Strobe Out – TTL level goes high at the start of the first pulse period for the burst, and goes low at

the start of the last period for the Burst.

Figure 5-13 and Figure 5-14, the

5-14 Return to Section Topics 3400S-900-01 Rev. B / January 2007

Series 3400 Pulse/Pattern Generators User’s Manual Section 5: Triggering

Period

Out 1

Trig Out

Out 2

Period Period

Period Source

(PerSrc)

VCO

Trigger Source

(TrgSrc)

ExtIn

Period

3-Period Burst

(Brst Cnt = 2)

Strobe Out

3-Period Burst

(Brst Cnt = 2)

Period Period

Period

Out 1

Trig Out

Out 2

Period Period

Trigger Source

(TrgSrc)

ExtIn

Period

3-Period Burst

(Brst Cnt = 2)

Strobe Out

3-Period Burst

(Brst Cnt = 2)

Period Period

ExtIn not synchronized to PLL/ClkIn.

Period Source

(PerSrc)

PLL or ClkIn

Figure 5-13

Gated Burst mode (VCO period source)

Figure 5-14

Gated Burst mode (PLL or ClkIn period source)

3400S-900-01 Rev. B / January 2007 Return to Section Topics 5-15

Section 5: Triggering Series 3400 Pulse/Pattern Generators User’s Manual

Period

Out 1

Trig Out

Out 2

NRZ

Period Period

Period Source

(PerSrc)

VCO

Trigger Source

(TrgSrc)

ExtIn

Period

3-Period Burst

(Brst Cnt = 2)

Strobe Out

NRZ

3-Period Burst

(Brst Cnt = 2)

Period Period

110

101

010

Gated Pattern mode

Timing for the gated Pattern mode is shown in Figure 5-15 (VCO period source) and Figure 5-16 (PLL or ClkIn period source). Note in Figure 5-16 that the PLL and ClkIn period sources are not synchronized to the external trigger source (ExtIn). The delay between trigger and start of the period is calculated as follows:

Delay = n x Period where, 1 < n ≤ 2

Trigger Source – Bit periods for a pattern start when the rising edge of an external trigger (ExtIn) is detected. The falling edge of the trigger marks the last pattern. In the Pattern length is 3 bits. Two 2-bit patterns are started by each gated trigger.

Period Source – Pattern output is synchronized to the selected period source: VCO, PLL or Clk In.

Trig Out – A TTL level pulse is generated for every bit period.

Strobe Out – Strobe output is programmable by the user.

Figure 5-15

Triggered Pattern mode (VCO period source)

Figure 5-15 and Figure 5-16,

5-16 Return to Section Topics 3400S-900-01 Rev. B / January 2007

Series 3400 Pulse/Pattern Generators User’s Manual Section 5: Triggering

Period

Out 1

Trig Out

Out 2

NRZ

Period Period

Trigger Source

(TrgSrc)

ExtIn

Period

3-Period Burst

(Brst Cnt = 2)

Strobe Out

NRZ

3-Period Burst

(Brst Cnt = 2)

Period Period

110

101

010

ExtIn not synchronized to PLL/ClkIn.

Period Source

(PerSrc)

PLL or ClkIn

Figure 5-16

Triggered Pattern mode (PLL or ClkIn period source)

External Width

Trigger Source – In the External Width operating mode, the pulse width is controlled by an

external trigger:

ExtIn – The pulse level follows the edges of an external trigger. A rising edge causes the output to go high, while a falling edge causes the output to go low.

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Section 5: Triggering Series 3400 Pulse/Pattern Generators User’s Manual

User Interface and remote programming mapping

Remote programming commands don't always map as expected to the front panel settings of the User Interface (UI).

• If TrigMode = Cont or :ARM:SOUR is set to IMM, the user can set :ARM:SENS to EDGE or LEV. The TrigSrc parameter on the front panel can be set to either ExtIn PLL or Manual, with the exception of Pulse mode, where PLL cannot be used as the trigger source. The :ARM:SENS setting or TrgSrc setting is ignored.

• If TrigMode ≠ Cont or :ARM:SOUR is set to either EXT or INT2 or MAN, the :ARM:SENS

command will be restricted. For example, if :ARM:SOUR is set to MAN, :ARM:SENS EDGE is the only acceptable condition — an error will occur if :ARM:SENS LEV is sent. This is because a manual gated condition cannot exist for the Series 3400.

Table 5-2

Mapping for User Interface settings and remote programming commands

Table 5-2 provides the mapping between commands and UI settings.

User Interface Setting* Remote Command

TrigMode = Cont maps to :ARM:SOUR IMM

TrigMode = Trig'd maps to :ARM:SENS EDGE

TrigMode = Gated maps to :ARM:SENS LEV

TrigSrc = ExtIn maps to :ARM:SOUR EXT

TrigSrc = PLL maps to :ARM:SOUR INT2 TrigS rc = Man maps to :ARM:SOUR MAN

PerSrc = VCO maps to :TRIG:SOUR IMM

PerSrc = PLL maps to :TRIG:SOUR INT2

PerSrc = ClkIn maps to :TRIG:SOUR EXT2

* Trigmode and TrigSrc are set from the TRIGGER menu.

PerSrc is set from the TIME menu.

5-18 Return to Section Topics 3400S-900-01 Rev. B / January 2007

In this section:

Top ic Page

Introduction........................................................................................ 6-2

Remote interfaces ............................................................................. 6-2

Status model ...................................................................................... 6-4

Section 6

Remote Programming

Selecting an interface.................................................................... 6-2

IEEE-488 interface ........................................................................ 6-2

USB interface ................................................................................ 6-3

Status register sets........................................................................ 6-5

Status byte and service request (SRQ)......................................... 6-5

Standard Event Status Register .................................................... 6-6

Operation Status group ................................................................. 6-7

Questionable Status group............................................................ 6-7

Service request programming example ........................................ 6-7

Common commands ......................................................................... 6-7

Command summary...................................................................... 6-7

Command examples ..................................................................... 6-8

SCPI command reference ................................................................. 6-9

Command summary...................................................................... 6-9

Command descriptions ................................................................. 6-14

Section 6: Remote Programming Series 3400 Pulse/Pattern Generators User’s Manual

Introduction

This section provides detailed information on the remote programming of the Series 3400.

Remote interfaces

The Series 3400 has two remote interfaces: IEEE-488 and USB. Note that you can use only one interface at a time.

NOTE The instrument must be rebooted after selecting a different interface or making any

changes to the communication parameters.

Selecting an interface

Select the interface to be used for remote operation (GPIB or USB):

1. On the front panel, press the UTILITY menu key, and then the System soft key.

2. Press the IOPort soft key to display the present interface selection.

3. Press the GPIB or USB soft key.

IEEE-488 interface

The Series 3400 can be connected to the IEEE-488 bus (also known as the GPIB, or General Purpose Interface Bus) through a cable equipped with standard IEEE-488 connectors. The Series 3400 conforms to the IEEE-488.2 and SCPI standards (Standard Commands for Programmable Instruments). IEEE-488.2 defines a syntax for sending data to and from instruments, how an instrument interprets this data, what registers should exist to record the state of the instrument, and a group of common commands. The SCPI standard defines a command language protocol. It goes one step farther than IEEE-488.2 and defines a standard set of commands to control every programmable aspect of an instrument.

Connections

The Series 3400 can be connected to the IEEE-488 bus through a cable equipped with standard IEEE-488 connectors. The connector can be stacked to allow a number of parallel connections to one instrument. Two screws are located on each connector to ensure that connections remain secure.

Although any number of connectors could theoretically be stacked on one instrument, it is recommended that you stack no more than three connectors on any one unit to avoid possible mechanical damage.

In order to minimize interference caused by electromagnetic radiation, it is recommended that only shielded IEEE-488 cables be used. The Models 7007-1 and 7007-2 shielded IEEE-488 cables are available from Keithley Instruments.

Connect the Series 3400 to the IEEE-488 bus as follows:

1. Line up the cable connector with the connector located on the rear panel. The connector is designed so that it will fit only one way. nector on the instrument.

2. Tighten the screws securely, but do not overtighten them.

3. Add additional connectors from other instruments, as required.

4. Make certain that the other end of the cable is properly connected to the controller. Most controllers are equipped with an IEEE-488 style connector, but a few may require a different

6-2 Return to Section Topics 3400S-900-01 Rev. B / January 2007

Figure 6-1 shows the location of the IEEE-488 con-

Series 3400 Pulse/Pattern Generators User’s Manual Section 6: Remote Programming

USB

Connector

IEEE-488

Connector

type of connecting cable. Consult the instruction manual for your controller for the proper connecting method.

Note that the IEEE-488 bus is limited to a maximum of 15 devices, including the controller. The maximum cable length is 20-meters, or two meters times the number of devices, whichever is less. Failure to observe these limits may result in erratic bus operation.

Figure 6-1

IEEE-488 and USB connector locations on rear panel

Address selection

The default primary address for the Series 3400 is 10. The primary address may be set to any value between 0 and 30 as long as address conflicts with other instruments are avoided. Note that controllers are also given a primary address, so do not use that address either. Most frequently, controller addresses are 0 or 21, but you should consult the controller's instruction manual for details. Whatever primary address you choose, you must make certain that it corresponds with the value specified as part of the controller's programming language.

To check the present primary address or to change to a new one, perform the following procedure:

1. Press the UTILITY menu key on the front panel, and then press the System soft key.

2. Press the GPIBAdd soft key to display the current GPIB primary address.

3. Set the GPIB address to the desired value in the range of 0 to 30 using the knob and/or numeric keys.

NOTE You must reboot the instrument after making changes to communication parameters.

USB interface

Before using the USB (Universal Serial Bus) interface, be sure to disconnect the GPIB from the instrument, as only one interface can be used at a time.

Connections

The Series 3400 includes a type B USB socket located on the rear panel (refer to Figure 6-1). Typically, you will use a USB cable equipped with a type A plug on one and a type B plug on the other end. Connect the type A plug to the type A USB socket on the host computer or USB hub. Connect the type B plug to the type B socket located on the rear panel of the Series 3400.

USB identifiers

Model 3401-F and 3401-R: VID (Vender ID) = 0x05E6

PID (Product ID) = 0x3401

Model 3402-F and 3402-R: VID (Vender ID) = 0x05E6

PID (Product ID) = 0x3402

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Section 6: Remote Programming Series 3400 Pulse/Pattern Generators User’s Manual

0 1

10 11 12 13

Logical

12 13

Logical

QSB MAV ESB

RQS

OSB

Status

Byte

QSB MAV ESB

OSB

Service

Request

Enable

Logical

*STB? *SRE <0-255>

*SRE?

14 14

OPC

QYE DDE EXE

CME

PON

10 11 12 13

Event

10 11 12 13

Logical

OPC

QYE DDE EXE CME

PON

*ESR?

*ESE <0 to 255> *ESE?

14 15

Questionable Event Registers

(Not Used)

Event Enable

Standard Event Registers

Operation Event Registers

(Not Used)

2 3

QSB = Questionable Summary Bit MAV = Message Available ESB = Event Summary Bit RQS = Request for Service OSB = Operation Summary Bit

Operation Complete

Query Error

Device Dependent Error

Execution Error

Command Error

Power On

0 1

2 3

5 6

10 11

Output Buffer

Always

Zero

Status model

The Series 3400 provides a number of status registers allowing the operator to monitor and manipulate the various instrument events. The status model is shown in the status model is the Status Byte Register. This register can be read by the user's test program to determine if a service request (SRQ) has occurred, and what event caused it.

Figure 6-2

Status model

Figure 6-2. The heart of

6-4 Return to Section Topics 3400S-900-01 Rev. B / January 2007

Series 3400 Pulse/Pattern Generators User’s Manual Section 6: Remote Programming

Status register sets

The Operation Status Register set and Questionable Status Register set are each made up of a condition register, positive and negative transition filters, an event register, and an event enable register.

NOTE The Operation Status group and Questionable Status group are not used by the Series

3400. While these registers can still be accessed with corresponding SCPI commands for compatibility with other instruments, associated status register bits are not used and always set to 0. Refer to “ information.

Condition register: Contains the current status of the hardware and firmware, is continuously updated, and is not latched or buffered. Condition registers are read-only.

Transition filters: Used to detect changes of state in the condition register and set the corresponding bit in the event register. Transition filter bits can be set to detect positive transitions (PTR), negative transitions (NTR) or both. These registers are read-write registers and are not affected by *CLS.

Event register: Latches transition events from the condition register. Event registers are cleared either by reading or with the *CLS command. Event registers are read-only, and bits are not buffered, so subsequent events are not recorded.

SCPI command reference” (later in this section) for more

Enable register: Defines which bits in an event register are included in the logical OR into the summary bit. The enable register is logically ANDed with the event register and the resulting bits ORed into the summary bit. Enable registers are read-write and are not affected by *CLS or querying.

Status byte and service request (SRQ)

The Status Byte Register summarizes the information from all other status groups. The summary bit for the Status Byte Register is located in bit 6 (RQS). When RQS is set, it generates an SRQ on the IEEE-488 bus. The Status Byte Register is read using a serial poll sequence or with the *STB? query.

An SRQ is enabled by setting the associated bit in the Service Request Enable Register with the *SRE command. This register can be read using the *SRE? query.

Bits in the Status Byte Register and Service Request Enable Register are summarized in

Table 6-1.

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Section 6: Remote Programming Series 3400 Pulse/Pattern Generators User’s Manual

Table 6-1

Status Byte Register and Service Request Enable Register bits

Bit Description

0 Not used (always 0) 1 Not used (always 0) 2 Not used (always 0) 3 Questionable Status Summary Bit (not used) 4 MAV: Message available in output buffer 5 Standard Event Status Summary bit 6 RQS: Request Service 7 Operation Status Summary Bit (not used)

Standard Event Status Register

Bits in the Standard Event Status Register are summarized in Table 6-2. Use *ESE to enable the corresponding register bit(s) and the *ESE? query to read the enable register. Use *ESR? to read the Standard Event Status Register bits.

Table 6-2

Standard Event Status Register bits

Bit Description

0 Operation Complete, set by *OPC 1 Not used (always 0) 2 Query Error 3 Device Dependent Error 4 Execution Error 5 Command Error 6 Not used (always 0) 7 Power On*

* Set bit indicates that a command/query has been sent, or a front

panel key has been pressed since the Series 3400 has been turned on. Querying this bit resets it to zero, and remains zero as long as the instrument remains on.

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Series 3400 Pulse/Pattern Generators User’s Manual Section 6: Remote Programming

Operation Status group

The Operation Status group is not used by the Series 3400. Bits in the associated status register are not used and always set 0. For compatibility with other instruments, associated SCPI commands can still be used. Refer to “

SCPI command reference” (later in this section) for more

information.

Questionable Status group

The Questionable Status group is not used by the Series 3400. Bits in the associated status register are not used and always set 0. For compatibility with other instruments, associated SCPI commands can still be used. Refer to “

SCPI command reference” (later in this section) for more

information.

Service request programming example

To generate a service request when a Query Error occurs, send these commands:

*ESE 4 *SRE 32

Common commands

Command summary

IEEE-488.2 common commands supported by the Series 3400 are summarized in Table 6-3. Many of these commands are associated with the status model. Refer to “Status model” (earlier in this section) for more information.

Table 6-3

Common commands

Command

*CLS Clear status structure *ESE <0-255> Set Standard Event Status Register mask *ESE? Read Standard Event Status Enable Register *ESR? Read Standard Event Status Event Register *IDN? Read Instrument's Identification string *OPC Set Operation Complete bit when all pending actions are completed *OPC? Read status of the Operation Complete bit *OPT? Returns “K13401” for the Model 3401 or“K13402” for the Model 3402 *RCL <0-9> Recall complete instrument setting from memory *RST Reset instrument to standard settings *SAV <1-9> Save complete instrument setting to memory *SRE <0-255> Set Service Request Enable Mask *SRE? Read Service Request Enable Mask *STB? Read Status Byte

1.Commands with numerics enclosed in angle brackets <> indicate parameter ranges for those commands. Commands without angle brackets have no parameters.

2.Does not clear front panel errors (only remote programming errors). Error messages will continue to be displayed until you press HELP or any other key.

3.The *IDN? and *OPT? queries have different responses when Emulation mode is enabled. Refer to

Emul in Section 4 of this manual.

Description

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Section 6: Remote Programming Series 3400 Pulse/Pattern Generators User’s Manual

Table 6-3

(continued)

Common commands

Command

*TRG Trigger instrument *TST? Execute instrument self-test. It will return a “0” if the Series 3400 boots

*WAI Wait until all pending actions are complete

1.Commands with numerics enclosed in angle brackets <> indicate parameter ranges for those commands. Commands without angle brackets have no parameters.

2.Does not clear front panel errors (only remote programming errors). Error messages will continue to be displayed until you press HELP or any other key.

3.The *IDN? and *OPT? queries have different responses when Emulation mode is enabled. Refer to

Emul in Section 4 of this manual.

Command examples

*ESE 4 *RCL 5 *SAV 2 *SRE 8

Set Standard Event Status Register mask to decimal 4

Recall instrument setting # 5 from memory

Save complete instrument setting to memory location #2

Set Service Request Enable Mask to decimal 8

Description

correctly.

6-8 Return to Section Topics 3400S-900-01 Rev. B / January 2007

Series 3400 Pulse/Pattern Generators User’s Manual Section 6: Remote Programming

SCPI command reference

Command summary

SCPI commands are summarized by subsystem in Table 6-4.

General notes:

• Brackets ([ ]) are used to denote optional character sets. These optional characters do not have to be included in the program message. Do not use brackets in the program message.

• Angle brackets (< >) are used to indicate parameter type. Do not use angle brackets in the program message.

• Uppercase characters indicate the short-form version for each command word.

• Default - Listed parameters are the *RST defaults, unless noted otherwise.

• The command parameter to set a state (on or off), can be sent as follows:

– ON or 1 (for the on state) – OFF or 0 (for the off state).

The response message for the queries will be 0 or 1.

3400S-900-01 Rev. B / January 2007 Return to Section Topics 6-9

Section 6: Remote Programming Series 3400 Pulse/Pattern Generators User’s Manual

Table 6-4

SCPI command summary

Command Parameters Default Description Page

:ARM ARM subsystem 6-14 [SEQuence[1] ⏐ :STARt] [:LAYer[1]] :EWIDth [:STATe] ON | OFF | 1 | 0 0 Set/query External Width Mode 6-14 :FREQuency <numeric> 100kHz Set/query trigger frequency with internal

PLL used as source

:IMPedance <numeric> 50Ω Set/query impedance at EXT INPUT 6-15 :LEVel <numeric> +1.0V Set/query threshold level at EXT INPUT 6-15 :PERiod <numeric> 10.0μs Set/query trigger period with

internal PLL used as source :SENSe EDGE | LEVel EDGE Set/query trigger on edge or on level 6-16 :SLOPe POS | NEG |

EITH

:SOURce IMM | INT[1] |

INT2 | EXT[1] | MAN

POS Set/query trigger slope at EXT INPUT 6-16

IMM Set/query trigger source (VCO | PLL |

EXT INPUT | ManTrg key)

6-14

6-15

6-16

:CHANnel CHANnel subsystem 6-18 :MATH OFF | PLUS OFF Set/query addition of Ch 1 and Ch 2 at

Ch 1 output

:CALibration[:ALL] CALibration subsystem

Set/query calibration of period (VCO),

delay, and width circuits

:DIGital DIGital subsystem 6-19 [:STIMulus] :PATTern :DATA[1|2|3] [<start>], data #1200 Set/query pattern data, from bit <start> 6-19 :PRBS[1|2|3] [<n>], <length> Set PRBS 2n-1 data (n = 5 to 14) 6-20 [:STATe] OFF | ON | 0 | 1 0 Set/query pattern mode state of on/off 6-20 :UPDate OFF | ON | 0 | 1

ONCE

:SIGNal[1|2] :FORMat RZ | NRZ RZ Set/query pattern format of

1 Set/query pattern mode update setting 6-20

designated output channel

6-18

6-20

6-10 Return to Section Topics 3400S-900-01 Rev. B / January 2007

Series 3400 Pulse/Pattern Generators User’s Manual Section 6: Remote Programming

Table 6-4 (continued)

SCPI command summary

Command Parameters Default Description Page

:DISPlay DISPlay subsystem 6-21

:BRIGhtness <numeric> 8 Set display brightness 6-21 :CONTrast <numeric> 6 Set display contrast 6-21 :TIMeout

:DELay <numeric> 30 Set display backlight-saver timer 6-22 [:STATe] OFF | ON | 0 | 1 1 Enable or disable display

backlight-saver timer

:OUTPut [1|2] OUTPut subsystem 6-22 [:NORMal] [:STATe] OFF | ON | 1 | 0 0 Set/query normal output state 6-22 :IMPedance [:INTernal] <numeric> 50Ω Set/query internal source

impedance of output :EXTernal <numeric> 50Ω Set/query external load

impedance :POLarity NORM | INV NORM Set/query output polarity 6-24

6-22

6-23

[:SOURce] SOURce subsystem 6-24 :CURRent [1|2] 6-24 [:LEVel] [:IMMediate] [:AMPlitude] <numeric> 20mA Set/query channel current

amplitude :OFFSet <numeric> 0.0μA Set/query channel current offset 6-25 :HIGH <numeric> +10mA Set/query channel current high level 6-25 :LOW <numeric> -10mA Set/query channel current low level 6-26 :LIMit [:HIGH] <numeric> +10mA Set/query channel current max limits 6-26 :LOW <numeric> -10mA Set/query channel current min

limits :STATe ON | OFF | 1 | 0 0 Enable/disable channel current limits 6-27

:FREQuency

[:CW | :FIXed] <numeric> 1MHz Set/query pulse frequency 6-27

:AUTO ONCE Measure frequency at CLK IN 6-27

:HOLD [1|2] VOLT | CURR VOLT Switch between VOLTage and CURRent

targeted commands :PHASe [1|2] [:ADJust] <numeric> 0.0 Set/query channel phase 6-28

6-26

6-28

3400S-900-01 Rev. B / January 2007 Return to Section Topics 6-11

Section 6: Remote Programming Series 3400 Pulse/Pattern Generators User’s Manual

Table 6-4 (continued)

SCPI command summary

Command Parameters Default Description Page

[:SOURce] SOURce subsystem (cont.) :PULSe :DCYCle [1|2] <numeric> 10.0% Set/query channel duty cycle 6-28 :DELay [1|2] <numeric> 0.0 Set/query channel delay 6-29 :HOLD TIME | PRATio TIME Hold absolute delay or delay as percent

of period fixed with varying frequency :UNIT S | SEC | PCT |

DEG | RAD :DOUBle [1|2] [:STATe] OFF | ON | 0 |1 0 Enable/disable double pulses 6-30 :DELay <numeric> 0ps Set/query delay between double pulses 6-30 :HOLD TIME | PRATio TIME Hold absolute delay or delay as percent

:UNIT S | SEC | PCT S Set/query delay units 6-31 :HOLD [1|2] WIDTh | DCY-

Cle | TDELay :PERiod <numeric> 1μs Set/query pulse period 6-32 :AUTO ONCE Measure pulse period at CLK IN 6-32 :TDELay [1|2] <numeric> 100ns Set/query trailing edge delay 6-33 :TRANsition [1|2] :HOLD TIME | WRATio TIME Hold absolute transitions

:UNIT S | SEC | PCT S Set/query transition time units 6-33 [:LEADing] <numeric> 2ns Set/query leading edge transition 6-34 :TRAiling <numeric> 2ns Set/query trailing edge transition 6-34 :AUTO OFF | ON | 0| 1

ONCE :WIDTh [1|2] <numeric> 100ns Set/query channel pulse width 6-35 :ROSCillator :SOURce INTernal |

EXTernal

S Set/query delay units 6-30

of period fixed with varying frequency

WIDTh Hold width|duty cycle|trailing edge delay

fixed with varying frequency

transitions as width ration fixed with varying width

1 Couple trailing edge to leading edge 6-34

EXT Set/query PLL reference source 6-35

6-29

6-31

6-32

6-33

6-12 Return to Section Topics 3400S-900-01 Rev. B / January 2007

Series 3400 Pulse/Pattern Generators User’s Manual Section 6: Remote Programming

Table 6-4 (continued)

SCPI command summary

Command Parameters Default Description Page

:SOURce] SOURce subsystem (cont.) :VOLTage [1|2] [:IMMediate] [:AMPLitude] <numeric> 1000mV Set/query channel amplitude

voltage

:OFFSet <numeric> 0.0mV Set/query channel offset voltage 6-36 :HIGH <numeric> +500mV Set/query channel high level

voltage

:LOW <numeric> -500mV Set/query channel low level

voltage :LIMit [:HIGH] <numeric> +500mV Set/query max voltage limit 6-38 :LOW <numeric> -500mV Set/query min voltage limit 6-38 :STATe ON | OFF | 1 | 0 0 Enable/disable voltage limits 6-39

:STATus STATus subsystem :OPERation 6-39 [:EVENt]? <numeric> Query operation event register :CONDition <numeric> Query operation condition register :ENABle <numeric> Set/query operation enable register :NTRansition <numeric> Set/query operation negative transition

register :PREset 6-39 :QUEStionable 6-39 [:EVENt]? <numeric> Query questionable event register :CONDition? <numeric> Query questionable condition register :ENABLe <numeric> Set/query questionable enable register :NTRansition <numeric> Set/query questionable negative transi-

tion register :PTRansition <numeric> Set/query questionable positive transi-

tion register

6-36

6-37

3400S-900-01 Rev. B / January 2007 Return to Section Topics 6-13

Section 6: Remote Programming Series 3400 Pulse/Pattern Generators User’s Manual

Table 6-4 (continued)

SCPI command summary

Command Parameters Default Description Page

:SYSTem SYSTem subsystem 6-40

:CHECk[:ALL][:STATe] OFF | ON| 0 | 1 1 Disable or enable error checking. 6-40 :ERRor? Query error queue 6-40 :PRESet No function :VERSion? Query SCPI compliance setting 6-40

:TRIGger TRIGger subsystem 6-40 [:SEQuence [1]|:STARt] :COUNt <numeric> 1 Set/query number of triggered periods to

ge generated per ARM event

:IMPedance <numeric> 50Ω Set/query impedance at CLK IN 6-41 :LEVel <numeric> 1.00V Set/query threshold level at CLK IN 6-42 :SLOPe POS | NEG POS Set/query trigger slope at CLK IN 6-42 :SOURce IMM | INT[1] |

INT2 | EXT[2]

IMM Set/query trigger source (IMM | VCO |

PLL | CLK IN)

6-40

6-42

Command descriptions

ARM subsystem

:ARM:EWID

:ARM[:SEQuence[1]|:STARt][:LAYer]:EWIDth[:STATe]

Parameters ON | OFF | 1 | 0

Default 0

Query :ARM:EWID?

Description Use this command to enable the EXT WIDTH trigger mode available on the Mode/

Trigger screen. When EXT WIDTH mode is switched on, the rest of the :ARM and :TRIG system is disabled. In EXT WIDTH mode a signal applied to the EXT INPUT determines the width and period of the output signal(s) from the instru ment. You can still control the edge transition times and levels of the output signal(s).

Example :ARM:EWID ON

:ARM:FREQ

:ARM[:SEQuence[1]|:STARt][:LAYer]:FREQuency[:CW][:FIXed]

Parameters Numeric

Suffix HZ with engineering prefixes, e.g.: MHZ is Megahertz

Limits 1mHz to 165MHz

Default 100kHz

Query :ARM:FREQ?

6-14 Return to Section Topics 3400S-900-01 Rev. B / January 2007

Tektronix Series 3400 Pulse Pattern Generators User's Manual User manual

Specifications and Main Features

Frequently Asked Questions

User Manual

WARRANTY

Manual Print History

Safety Precautions

Table of Contents

List of Figures

List of Tables

Series 3400 summary

Basic pulse parameters

Operating modes

Additional pulse characteristics

General information

Front and rear panel familiarization

Power-up

Display

Defaults

Introduction

Out 1 and Out 2 connections

Trig Out and Ext In connections

Strobe Out connection

Clk In connections

Ref Out and Ref In connections

Pulse, Burst and External Width operation

Pattern operation

Saving and recalling setups

Pulse/pattern parameters

Triggering overview

Continuous

Triggered

Gated

External Width

User Interface and remote programming mapping

Introduction

Remote interfaces

Status model

Common commands

SCPI command reference