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DEI PCX-7420 Operation Manual

Pulsed current source
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PCX-7420
Pulsed Current Source
Operation Manual
Directed Energy, Inc.
1609 Oakridge Dr., Suite 100, Fort Collins, CO 80525
(970) 493-1901
sales@directedenergy.com
www.directedenergy.com
Document #7650-0004, Rev. C2
© Copyright 2019, Directed Energy, Inc. All rights reserved.

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Summary of Contents for DEI PCX-7420

  • Page 1 PCX-7420 Pulsed Current Source Operation Manual Directed Energy, Inc. 1609 Oakridge Dr., Suite 100, Fort Collins, CO 80525 (970) 493-1901 sales@directedenergy.com www.directedenergy.com Document #7650-0004, Rev. C2 © Copyright 2019, Directed Energy, Inc. All rights reserved.

  • Page 3: Table Of Contents

    Quick Start Guide ............5  Safety ......................5  Requirements ....................5  Controlling the PCX-7420 From the Front Panel .......... 5  Controlling the PCX-7420 From a Computer ..........6 Introduction ..............7  Description ....................7 ...

  • Page 4: Safety

    • Do not open the cover of PCX-7420. There are no user-serviceable parts inside. Opening the cover exposes you to lethal shock and voids the factory warranty.

  • Page 5: Quick Start Guide

    • Has the rear enable and keyswitch enabled. Their icons should be green.  Controlling the PCX-7420 From the Front Panel 1. Disable the PCX-7420.  If the ENABLE button on the front panel is illuminated, press the button to disable the unit.

  • Page 6: Controlling The Pcx-7420 From A Computer

     Press the Done button. 8. Enable the PCX-7420.  Press the ENABLE button on the front panel. The button illuminates.  Controlling the PCX-7420 From a Computer 1. Disable the PCX-7420.  Send the command “OUTPUT:DISABLE”. 2. Set the main output current.

  • Page 7: Introduction

    RS232, USB, or Ethernet interface. The bias feature allows the PCX-7420 to deliver the current pulse in two steps. The first step—the bias pulse—starts before the intended trigger time and is adjusted to supply enough current to set the diode just below the lasing point.

  • Page 8: Panel Layout

     Panel Layout All features of the front and rear panel are labeled. Their functions are covered in the next section. Page 8 of 32 For more information: 970.493.1901 or sales@directedenergy.com Document #7650-0004 Rev C2. © Copyright 2019 Directed Energy, Inc. All rights reserved.

  • Page 9: Front Panel Features

     Front Panel Features LOCAL Button Returns the PCX-7420 to front-panel control during computer control. Illuminates red during power-up initialization. Flashes red during a fault. ENABLE Button Toggles the PCX-7420 between enabled and disabled. Illuminates green when the unit is enabled. Illuminates solid green, then flashes green during power-up initialization.

  • Page 10: Rear Panel Features

    Output A socket that accepts the factory-supplied output cable and provides the generated current pulses. DO NOT TOUCH any part of this cable while the PCX-7420 is powered up. Please review the Safety section on Page 3. Note: Absence of a properly-installed output cable disables the output and creates a rear enable fault.

  • Page 11: Accessories Included

    Output Cable A factory-supplied cable that provides high current pulses to external devices. A DB- 37 male connector fits the socket on the rear panel of the PCX-7420; a DB-37 female connector is on the user end. Output Cable Connector Pinouts The male DB-37 connector interfaces with the instrument and has the following pinout: ...
  • Page 12  Pins 17, 18, 19, 36, 37: no connection Interlock The DEI instrument requires that pins 18 and 19 of the male DB-37 be connected to satisfy an interlock that determines whether the output cable is present. If this connection is not detected the instrument will not be enabled.

  • Page 13: Operation

    Operation  Setup 1. Make sure the PCX-7420 has been OFF for at least ten minutes. 2. Make sure the polarity of the diode connection is correct. If necessary, review the output cable pinout in the Specifications section. 3. Make the other connections as necessary: External Trigger, External Bias, Sync, IMON, Rear Enable, and the connection to the computer.

  • Page 14: Set The Output Current

     Set the Output Current MAIN:CURRENT:SETPOINT? MAIN:CURRENT:SETPOINT n 1. On the Home screen, press the Output button. 2. The Set Output Current screen appears. Press the encoder knob to select a resolution: x0.001, x0.010, x0.100, or x1.000. 3. Turn the encoder knob to adjust the output current.

  • Page 15: Set The Pulse Width

     Set the Pulse Width TRIG:INT:MAIN:PULSEWIDTH? TRIG:INT:MAIN:PULSEWIDTH n 1. On the Home screen, press the Pulse Width button. 2. The Set Pulse Width screen appears. Press the encoder knob to select a resolution: x0.025, x0.100, x1, x100, or x1000. 3. Turn the encoder knob to adjust the pulse width.

  • Page 16: Set The Trigger

    Set the Trigger Set the Source TRIG:INTERNAL TRIG:EXTERNAL NOTE: If you have just powered up the PCX-7420, the unit is in Internal Trigger mode. 1. On the Home screen, press the gray Trigger button. 2. The Select Trigger screen appears. Press the button for the desired trigger mode.

  • Page 17: Set The Frequency

    The range is 40 Hz to 100000 Hz. 4. On the screen, press the Done button. The Home screen reappears.  View Information About the PCX-7420 *IDN? 1. On the Home screen, press the tools button. 2. The Settings screen appears. Press the About button.

  • Page 18: Save Settings

     Save Settings *SAVE n 1. On the Home screen, press the tools button. 2. The Settings screen appears. Press the Save Settings button. 3. The Save screen appears. Press the button for one of the four locations to which you want to save the settings.

  • Page 19: Recall Settings

     Recall Settings *RECALL n 1. On the Home screen, press the tools button. 2. The Settings screen appears. Press the Recall Settings button. 3. The Recall screen appears. Press the button for one of the four locations from which you want to recall the settings.

  • Page 20: Warnings And Faults

     Warnings and Faults All faults disable the PCX-7420. To continue after clearing a fault, you must send an “OUTPUT:ENABLE” command from the computer or press the ENABLE button on the front panel. Red Keyswitch Status Icon STATUS:KEYSWITCH?  The keyswitch was OFF at power-up, or it was turned OFF during disabled operation.
  • Page 21 Rear Enable Hardware Warning FAULT:CLEAR:ALL  The user attempted to enable the PCX-7420 while the rear enable was disabled.  On the screen, press the Clear Warning button.  The Home screen appears with a red rear- enable status icon.

  • Page 22: View The Communication Settings

    1. On the Home screen, press the tools button. 2. The Settings screen appears. Press the Comm Settings button. 3. The PCX-7420 Comm screen appears. Press the button for the desired port.  If you select RS232 The screen reports the Baud rate, the number of data bits and stop bits, and the parity.

  • Page 23: Power Down

    Power Down WARNING Risk of fatal electric shock. Wait at least 10 minutes after powering down the PCX-7420 before handling the output cable or laser diode. 1. Disable the unit by pressing the front panel BUTTON or by sending a computer command “OUTPUT:DISABLE”.

  • Page 24: Command Set

    Commands and queries that require data, denoted as n, must have a space between the command and the data. The PCX-7420 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 PCX-7420, the PCX-7420 sends a response.
  • Page 25 *IDN? Short for Identity; returns the manufacturer’s name, unit model number, serial number, firmware revisions, and manufacture date. Example: *IDN? DEI Scientific, PCX-7420, 00081, Q03 M04 C05, 00 Page 25 of 32 For more information: 970.493.1901 or sales@directedenergy.com Document #7650-0004 Rev C2. © Copyright 2019 Directed Energy, Inc. All rights reserved.
  • Page 26 Command Failed. Keyswitch or rear enable error. (if a fault is preventing the PCX-7420 from enabling) *RECALL n Recalls saved configurations and sets the PCX-7420 to them. The value of n must be between 1 and 4. Example: *RECALL 2...
  • Page 27 *SAVE n Saves the current configuration to non-volatile memory. The value of n must be between 1 and 4. Example: *SAVE 3 Saved Memory Location 3 STATUS:KEYSWITCH? Returns whether the keyswitch is enabled or disabled. Example: STATUS:KEYSWITCH? Disabled STATUS:REAR:ENABLE? Returns whether the rear enable is enabled or disabled. Example: STATUS:REAR:ENABLE? Disabled TEMP:IN?
  • Page 28 TRIG:EXT:TERM? Returns the termination impedance of the external trigger input in ohms. Example: TRIG:EXT:TERM? 50 Ohms TRIG:EXT:TERM n Sets the termination impedance of the external trigger input in ohms. The value of n must be 50 or 10000. Example: TRIG:EXT:TERM 50 TRIG:EXT:TERM 50 TRIG:INTERNAL Sets the trigger to internal.
  • Page 29 TRIG:INT:MAIN:PULSEWIDTH 280000 TRIG:INT:BIAS:PULSEWIDTH? Returns the pulse width of the bias current pulse, in nanoseconds. Example: TRIG:INT:BIAS:PULSEWIDTH? 12000 nsec TRIG:INT:BIAS:PULSEWIDTH n Sets the pulse width of the main current pulse. The value of n must be in nanoseconds from 0 to 25000000. Example: TRIG:INT:BIAS:PULSEWIDTH 12000 TRIG:INT:BIAS:PULSEWIDTH 1 Page 29 of 32...

  • Page 30: Warranty And Service

    Connected, installed, adjusted, or used otherwise than in accordance with instructions furnished by DEI. DEI reserves the right to make any changes in the design or construction of its products at any time, without incurring any obligation to make any change whatever in units previously delivered.

  • Page 31: Ce Declaration

    CE Declaration Page 31 of 32 For more information: 970.493.1901 or sales@directedenergy.com Document #7650-0004 Rev C2. © Copyright 2019 Directed Energy, Inc. All rights reserved.

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