DEI PDG-2500 Operating instructions



PDG-2500

Pulsed Digital Generator

Operation Manual

Directed Energy, Inc.

1609 Oak Ridge Dr., Suite 100, Fort Collins, CO 80525

(970) 493-1901

[email protected]

ixyscolorado.com

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Contents

ixyscolorado.com........................................................................................................................................1

Contents........................................................................................................................................................2

Safety............................................................................................................................................................4

QuickStartGuide..........................................................................................................................................5

 Safety................................................................................................................................................5

 Requirements....................................................................................................................................5

 ControllingthePDG‐2500fromthefrontpanel...............................................................................5

 ControllingthePDG‐2500fromacomputer.....................................................................................6

Introduction

..................................................................................................................................................7

 Description........................................................................................................................................7

 PanelLayout......................................................................................................................................9

 FrontPanelFeatures.........................................................................................................................9

 EndPanelFeatures.........................................................................................................................10

 AccessoriesIncluded.......................................................................................................................10

Operation....................................................................................................................................................11

 PowerUp.........................................................................................................................................11

 SettheFrequency.............................................................................................................................1

 SettheDutyCycle.............................................................................................................................

1

 SettheAnalogOutput......................................................................................................................2

 SettheSingleShot............................................................................................................................2

 ViewInformationAboutthePDG‐2500............................................................................................3

 ViewtheCommunicationSettings....................................................................................................3

 SaveSettings.....................................................................................................................................4

 RecallSettings...................................................................................................................................4

 PowerDown......................................................................................................................................5

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CommandSet................................................................................................................................................1

Specifications................................................................................................................................................4

WarrantyandService....................................................................................................................................7

 Warranty...........................................................................................................................................7

 FactoryServiceandSupport.............................................................................................................8

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Safety

 Do not open the cover of PDG-2500. There are no user-serviceable parts inside.

Opening the cover exposes you to shock and voids the factory warranty.

 Do not install, handle, or remove the output cables while the PDG-2500 is

operating.

 Do not use this device in a manner not specified by the manufacturer.

 Do not use where liquids are present or in corrosive environments. Clean this

instrument by wiping with a dry or damp cloth.

 Use ONLY NiMH (nickel-metal hydride) batteries.



Quick Start Guide

 Safety

Follow the safety guidelines on previous page. DO NOT PROCEED WITHOUT

UNDERSTANDING AND OBSERVING THESE GUIDELINES.

 Requirements

Make sure the PDG-2500 is:

 connected with the proper cables and termination impedance

 powered up

 Controlling the PDG-2500 from the front panel

1. Disable the PDG-2500

The PDG-2500 is enabled if the Enable icon on the front panel has a checkmark.

To disable, press the Disable icon or press the encoder control knob.

2. Set the frequency

 Press the Frequency icon on the touch screen.

 Press the encoder knob to set the resolution.

 Turn the encoder knob to set the frequency.

 Press the Done icon.

3. Set the duty cycle

 Press the Duty Cycle icon on the touch screen.

 Press the encoder knob to set the resolution.

 Turn the encoder knob to set the duty cycle.

 Press the Done icon.

4. Enable the PDG-2500

Press the Enable icon on the touch screen. The icon displays a checkmark.



 Controlling the PDG-2500 from a computer

1. Disable the PDG-2500

Send the command “OUTPUT:DISABLE”.

2. Set the pulse trigger frequency

Send the command “FREQ n”, where n = [5 to 1000000]. Units are hertz.

3. Set the pulse duty cycle

Send the command “DUTYCYCLE n”, where n = [0.01 to 100.00].

Units are percent.

4. Set the analog voltage

Send the command “ANALOG:SETPOINT n”, where n = [0 to 65536].

Units are DAC counts of 5 V/65535 = 76.293 µV each.

5. Enable the PDG-2500

Send the command “OUTPUT:ENABLE”.



Introduction

 Description

The PDG-2500 is a single-channel pulse generator source for laser drivers or other

devices requiring a precise frequency generator. It provides pulse repetition

frequencies from 5 Hz to 1.000 MHz and duty cycles of 0.00 % to 100.00 %.

Single-shot pulse widths range from 80 ns to 1.0000000 second.

The PDG-2500 has one analog channel with 0.000 to 5.000 V output and 16-bit

adjustability.

The frequency, duty cycle, and analog amplitude are adjustable from the touch

screen or by computer control via USB interface. The digital output requires a 50 Ω

termination.

Using the instrument is extremely simple using the color LCD touch-screen and a

control knob. The PDG-2500 has the ability to store five unique user settings.

The PDG-2500 is a hand-held system and is battery powered for portability and

electrical isolation.

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 Typical Uses for the PDG-2500

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Panel Layout

All features of the front touch screen and the top end panel are labeled. Their

functions are covered in the next sections.

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 Front Panel Features

Local Mode

When in computer control, pressing or turning the encoder knob returns the PDG-

2500 to front panel control.

Enable Icon

The Enable icon allows PDG-2500 operation. A checkmark appears when the unit is

enabled.

Touch Screen

The touch screen provides a graphical user interface and front-panel touch control

for most functions of the PDG-2500.

Encoder Knob

Turn the encoder knob to change a value. Push it to cycle through the resolutions

(increments of value change).

TouchScreen

EnableIcon

EncoderKnob

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 End Panel Features

Analog Output

An analog voltage is available for external devices via an SMB connector.

Digital Output

Pulses for external devices are available via an SMB connector.

USB Cable Connector

Communicates with an external computer through a USB cable.

Power Cable Connector

Accepts a 5 VDC 3 W power adapter.

Power On Button

Turns the PDG-2500 on. Use the touch panel “Settings” menu to turn the unit off.

 Accessories Included

AC Power Adapter

Factory-supplied 5 VDC 3 W power adapter.

Battery Power

Two AA batteries, factory supplied, use ONLY NiMH (nickel-metal hydride) batteries.

PowerOnButton

PowerCableConnector

USBCableConnector

DigitalOutput

AnalogOutput

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Operation

 Power Up

1. Press the power button for 3 seconds to power up the

instrument.

2. The unit plays a tune and displays the DEI information

shown.

3. After a few seconds, the PDG-2500 displays the

Home screen.

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Numerical displays show the present settings

Analog icon sets the output analog voltage

Duty Cycle icon sets the output duty cycle

Frequency icon sets the output frequency

PDG-2012 icon displa

y

s the Settin

g

s menu

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 Set the Frequency

FREQ?

FREQ n

1. From the Home screen, press the Set Frequency

icon.

2. The Set Frequency screen appears.

3. Press the encoder knob to change the resolution:

4. Turn the encoder knob to change the frequency: 5 Hz

to 1000000 Hz.

5. On the screen, press the Done icon. The Home

screen reappears.

 Set the Duty Cycle

DUTYCYCLE?

DUTYCYCLE n

1. On the Home screen, press the Duty Cycle icon.

2. The Set Duty Cycle screen appears.

3. Press the encoder knob to select a resolution: x0.01,

x0.10, x1.00, or x10.00.

4. Turn the encoder knob to change the duty cycle: 0.00

% to 100.00 %.

5. On the screen, press the Done icon.

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Frequency  Resolution

5Hzto995Hz  5Hz

1.0kHzto49.9kHz 100Hz

50kHzto1.000MHz 1000Hz

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 Set the Analog Output

ANALOG:SETPOINT?

ANALOG:SETPOINT n

1. On the Home screen, press the Analog Output icon.

2. The Set Analog Output screen appears.

3. Press the encoder knob to select a resolution: x1,

x10, x100, x1,000, or x10,000.

4. Turn the encoder knob to change the Analog Set

point: 0 to 65,535. The larger the DAC count the

higher the V

out

set point. Both the DAC count and the

voltage are displayed.

5. On the screen, press the Done icon.

 Set the Single Shot

SINGLE:SHOT?

SINGLE:SHOT n

1. On the Home screen, press the Frequency icon.

2. The Set Frequency screen appears. Press the

Single Shot check box.

3. The home screen appears in single shot control.

4. To change the single shot pulse width, press the

Single Shot icon.

5. Press the encoder knob to select a resolution: x80,

x160, x1,000, x10,000, x100,000, x1,000,000,

x10,000,000, or x100,000,000 ns.

6. Turn the encoder knob to change the single shot: 80

ns to 1.0000000 second.

7. On the screen, press the Done icon.

8. Press Enable icon to turn on the single shot pulse for

the set pulse width.

9. To change back to duty cycle control, press the Duty

Cycle Control check box.



10. The home screen appears in duty cycle control.

 View Information About the PDG-

2500

*IDN?

1. On the Home screen, press the

PDG-2500 icon.

2. The Settings screen appears.

Press the About icon.

3. The About screen appears. View

the model number, serial number,

manufacture date, and firmware

revision level.

4. Press the touch screen at any

location to return to the Settings

screen.

 View the Communication Settings

1. On the Home screen, press the

PDG-2500 icon.

2. The Settings screen appears.

Press the USB Information icon.

3. The PDG-2500 USB Information

screen appears. The screen

reports the baud rate, the number

of data bits and stop bits, and the

parity.

4. Press the upper left icon to return

to the Home screen.



 Save Settings

*SAVE n

1. On the Home screen, press the

PDG-2500 icon.

2. The Settings screen appears.

Press the Save Settings icon.

3. The Save screen appears. Press

the icon for one of the five

locations to which you want to

save the settings.

NOTE: Saving to a location overwrites any data at that

location.

4. A checkmark indicator appears on the saved location

when it is finished. Press the upper left icon to return

to the Home screen.

 Recall Settings

*RECALL n

1. On the Home screen, press the

PDG-2500 icon.

2. The Settings screen appears.

Press the Recall Settings icon.

3. The Recall screen appears. Press

the icon for one of the five

locations from which you want to

recall the settings.

4. A checkmark indicator appears

when the recall is finished. Press

the upper left icon to return to the Home screen.

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 Power Down

OUTPUT:DISABLE

1. Disable the unit by pressing the Disable icon or by

pressing the encoder knob.

2. On the Home screen, press the PDG-2500 icon.

3. Press the Off icon on the Settings screen.



Command Set

The Command Set consists of all the commands and queries that the PDG-2500

supports via remote USB control. Commands and queries must be in all capital

letters. Commands and queries that require data, denoted as n, must have a space

between the command and the data.

The PDG-2500 expects “\n” to be the end line character of commands and queries.

The responses to the user’s computer are also terminated with “\n”. For every

command sent to the PDG-2500, a response will be sent back to the user. The user’s

software must wait for a response before sending another command to avoid an

overflow of the PDG-2500 receive buffer.

In the examples, the command or query is in black; the response is in blue italics.

*LIST?

Lists all commands and queries supported by the PDG-2500. Example:

*LIST?

*IDN?

*SAVE n :: n=[1 … 5]

*RECALL n :: n=[1 … 5]

*LIST?

OUTPUT?

OUTPUT:ENABLE

OUTPUT:DISABLE

FREQ?

FREQ n :: n=[5 … 1,000,000] Hz

DUTYCYCLE?

DUTYCYCLE n :: n=[0.00 … 100.00] %

ANALOG:SETPOINT?

ANALOG:SETPOINT n :: n=[0 … 65,535] DAC counts

SINGLE:SHOT?

SINGLE:SHOT n :: n=[80 … 1,000,000,000] ns

*IDN?

Abbreviation for identity; returns the manufacturer’s name, unit model number,

serial number, firmware revision, and manufacture date. Example:

*IDN?

DEI Scientific, PDG-2500, 2012-121131, FW.002, 11.27.2012

*SAVE n

Saves the current configuration to non-volatile memory. The value of n must be

between 1 and 5. Example:

*SAVE 3

Saved Memory Location 3



*RECALL n

Recalls saved configurations. The value of n must be between 1 and 5. Example:

*RECALL 2

Recall Memory Location 2

OUTPUT?

Returns the state of the output (enabled or disabled). Example:

OUTPUT?

Disabled

OUTPUT:DISABLE

Disables the output. Performs the same function as pressing the front-panel

ENABLE icon. Example:

OUTPUT:DISABLE

Disabled

OUTPUT:ENABLE

Enables the output. Performs the same function as pressing the front-panel

ENABLE icon. Example:

OUTPUT:ENABLE

Enabled

FREQ?

Returns the trigger frequency in hertz. Example:

FREQ?

24000 Hz

FREQ n

Sets the trigger frequency in hertz. The value of n must be between 5 and

1000000. Example:

FREQ 24000

DUTYCYCLE?

Returns the duty cycle of the pulse in percent. Example:

DUTYCYCLE?

28.00 %



DUTYCYCLE n

Sets the duty cycle of the pulse in percent. The value of n must be from 0.00 to

100.00. Example:

DUTYCYCLE 28.00

ANALOG:SETPOINT?

Returns the DAC set point for the analog output. Example:

ANALOG:SETPOINT?

32768 DAC counts

ANALOG:SETPOINT n

Sets the DAC set point for the analog output. The value of n must be from 0 to

65,535. Example:

ANALOG:SETPOINT 32123

32123 DAC counts

SINGLE:SHOT?

Returns the pulse time for the single-shot output. Example:

SINGLE:SHOT?

100 ns

SINGLE:SHOT n

Sets the pulse time for the single shot output. The value of n must be from 80 ns

to 1,000,000,000 ns. Example:

SINGLE:SHOT 321



Specifications

The PDG-2500 meets or exceeds the following specifications.

Parameter Value

DigitalPulseOutput(DutyCycleControl)

FrequencyRange 5Hzto1.000MHz

FrequencyResolution Frequency Resolution

5Hzto995Hz 5Hz

1.0kHzto49.9kHz100Hz

50kHzto1.000MHz 1000Hz

FrequencyAccuracy ±(0.01xsetpoint+2)Hz

T

jit(cc)



cycletocyclejitter

25ns

DutyCycleRange 0.00%to100.00%

DutyCycleResolution 0.01%

DutyCycleAccuracy ±(0.01xsetpoint+2.5)%

T

jit(duty)



dutycyclejitter

25ns

OutputVoltageLow(V

OL

) 0V±0.1V

OutputVoltageHigh(V

OH

) 4V±0.25V

OutputCurrentLow(I

OL

)‐400µAwith50Ωloadtermination

OutputCurrentHigh(I

OH

) 90mA

Termination Requires50Ω

Connector SMB(50Ωimpedance)

DigitalPulseOutput(Single‐ShotControl)

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DEI PDG-2500 Operating instructions

DEI PDG-2500 Operating instructions

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