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Summary of Contents for BNC 525
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Page 1: Pulse Generator
Operating Manual Version 1.0 Model 525 Pulse Generator Berkeley Nucleonics Corporation 2955 Kerner Blvd. San Rafael, CA 94901 Phone: 415-453-9955 Fax: 415-453-9956 Email: info@berkeleynucleonics.com Web: www.berkeleynucleonics.com... -
Page 2: Table Of Contents
OMMAND ERMINAL .................................18 ARAMETER TORAGE 7.4.1 Saving Custom Settings to a Bin ..........................18 7.4.2 Recalling Custom Settings from a Bin ........................18 OPERATING THE 525 ..............................19 ........................19 ORMAL NTERNAL ENERATOR PERATION 8.1.1 Continuous Mode ..............................19 8.1.2 Single Shot Mode ..............................20 8.1.3... - Page 3 Using the External Gate to Control the System .....................22 8.3.3 Using the External Gate to Control the Channel ....................23 8.3.4 Using the External Re-Arm ............................23 ................................24 UTPUT XAMPLES PROGRAMMING THE 525 .............................. 25 525 C ........................25 ERSONAL OMPUTER TO OMMUNICATION USB I ..............................25...
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Page 4: Introduction
1.2 Warranty In addition to a 30-day money back guarantee, the model 525 has a two-year limited warranty from the date of delivery. This warranty covers defects in materials and workmanship. If repairs are required during the warranty period, contact the factory for component replacement or shipping instructions. Include the serial number of the instrument. -
Page 5: Safety Issues
2 Safety Issues Normal use of test equipment presents a certain amount of danger due to electrical shock because it may be necessary for testing to be performed where voltage is exposed. An electrical shock causing 10 milliamps of current to pass through the heart will s top most human heartbeats. -
Page 6: Certificate Of Conformance
3 Certificate of Conformance... -
Page 7: Front & Back Panel Overview
4 Front & Back Panel Overview 4.1 Front Panel 4.1.1 Indicators A total of up to 9 separate LED indicators are included on the front panel of the 525. The following details the type of indication they represent. Power Indicates the unit is powered on. -
Page 8: Bnc Output Connectors
4.2.2 BNC Output Connectors Standard BNC connectors are found on the back panel which output the pulses for their respective channel. 4.2.3 USB A “Standard B” female type USB connector is found on the back panel. This provides power to the unit as well as communication (on standard units). -
Page 9: Pulse Concepts And Pulse Generator Operations
Arming the counter is done by enablin g the Run/Stop function by either the external button or through the 525 application. With external trigger disabled, the Run/Stop function also generates the start command for the counter. With external trigger enabled, the external trigger provides the start pulse. -
Page 10: Digital Output Multiplexer
5.7 Enabling System Output The Run/Stop button found on both the front and back pa nel of the 525 is used to arm the system. With external trigger disabled, the button will arm and start pulse output. With external trigger enabled, the button will arm the pulse generator. -
Page 11: 525 Setup
USB. The multi-functional power button, labeled “Run/Stop,” located on both front and back of the unit will turn on the 525 when pressed once. If a USB DC wall-mount supply is chosen to be used, it is recommended that the AC Mains Socket-Outlet be easily accessible so that the external power supply can be easily removed from the AC Mains Socket Outlet. -
Page 12: Driver Installation (Windows 7 And Greater)
“Computer” icon and select properties. Select Device Manager on the left toolbar. b) Navigate to Control Panel and then Device Manager. 5. In Device Manager you should see a device under the Other Devices called the BNC-PG. There will be a yellow exclamation point next to it. -
Page 13: 525 Application
Aside from using the SCPI command protocol, the included software application is the primary means of communication with the 525. This application allows simple control of the 525 unit via the USB communications port. To run the software, simply double click on the application which can be found on the included CD. No installation is required. -
Page 14: Basic Operation
Ensure that the proper drivers have already been installed on the remote computer. These drivers will need to be installed for the remote computer to interface to the 525. Reference the “525 Setup USB” section for more information on installing the proper drivers. -
Page 15: Channels Section
Rising or falling edge are the available modes. 7.2.2 Channels Section The Channels Section of the 525 application only affects the 525‟s channel parameters. Complex pulse trains can be created by combining various system and channel modes. As shown below, the following channel parameters may be altered: Figure 7-3 –525 Application: Channel Parameters... -
Page 16: Options Section
Only the timing parameters are multiplexed together, not the actual output amplitudes. Gate Mode: Selection determines which active state will gate the selected channel output. 7.2.3 Options Section The Options Section of the 525 application has additional advanced features. The following figure shows the additional options:... -
Page 17: Command Terminal
Clock Input: This allows the unit to be synchronized with another device. When an externa l clock source is applied to this input and the proper frequency is selected, the 525 will lock onto the input source derive its internal clock from the external source. -
Page 18: Parameter Storage
7.4.1 Saving Custom Settings to a Bin The 525 series has the capability to save up to 6 custom user setups. Once all the custom user settings are ready to be saved to one of six bins, click “Storage”, “Save To Bin”, followed by selecting the bin number to save the custom settings to. -
Page 19: Operating The 525
8 Operating the 525 8.1 Normal Internal Rate Generator Operation The 525 has a complete set of functions providing a number of modes of operation for the internal or “System” rate generator (T ). Most of these functions can be ignored if a simple continuous stream of pluses is required. -
Page 20: Single Shot Mode
After the burst has been completed, pressing the Run/Stop button will generate another burst of pulses. To generate a burst of pulses set the following parameters in the 525 application: Within the System section: Select mode to be Burst. -
Page 21: Channel Normal Function
8.2.2 Channel Single Shot Function The Single Shot mode generates a single pulse every time the unit is placed into active mode. To use the channels‟ single shot mode set the following parameters in the 525 application: Within the System section: Set the mode to Continuous. -
Page 22: Channel Duty Cycle Mode
The channel duty cycle mode will generate a stream of pulses on the channel level which will repeat on for „N‟ pulses and off or „M‟ pulses. To generate the stated sequence of pulses set the following parameters in the 525 application: ... -
Page 23: Using The External Gate To Control The Channel
The external input configured in Re-Arm mode may also be used to externally rearm the channel timers by inputting a trigger pulse to the external input. This is the same as issuing the *ARM command or pressing the run/stop button. To rearm the channel timers with an external source set the following parameters on the 525 application: ... -
Page 24: Output Examples
8.4 Output Examples The following figure presents a graphical representation of the channel modes as well as the external trigger/gate functionality. It should be noted that following figure represents examples only as many parameters in each pulse train below have the potential to be modified. -
Page 25: Programming The 525
9.2 USB Interface Overview The USB interface is standard on the 525. Once the proper drivers have been installed, the 525 will show up in the device manager as a USB to Serial Port Adapter. The 525 can then be communicated with by either the included 525 application or by using any generic communication terminal program . -
Page 26: Line Termination
9.3.1 Line Termination The pulse generator uses text-style line terminations. When a command is sent to the unit, the firmware is programmed to read characters from a communication port until it reads the line termination sequence. The command string is parsed and executed after reading these characters. These characters are the “carriage return”... -
Page 27: Scpi Keyword Separator
Will return 1<cr><lf> :PULSE1:WIDTH? <cr><lf> Will return 0.000120000 <cr><lf> :PULSE1:POL? <cr><lf> Will return NORM <cr><lf> 9.3.5 SCPI Keyword Separator A colon (:) must always separate one keyword from the next lower -level keyword. A space must be used to separate the keyword header from the first parameter. 9.3.6 SCPI Optional Keywords Optional keywords and/or parameters appear in squa re brackets ( [ ] ) in the command syntax. -
Page 28: Programming Examples
Invalid command keyword. Missing parameter. Invalid parameter. Query only, command needs a question mark. Invalid query, command does not have a query form. Command unavailable in current system state. 9.3.9 Programming Examples Example 1) 20 ms pulse width, 2.3 ms delay, 10 Hz internal trigger, and continuous operation. :PULSE1:STATE ON <cr>... -
Page 29: 525 Scpi Command Summary
9.4 525 SCPI Command Summary Keyword Parameter Command Keyword 1 Keyword 2 Notes Range The units‟ upper level :INSTrument command keyword. Returns a comma separated :CATalog list of the names of all channels. Returns an indentured list of :COMMands all valid SCPI commands... - Page 30 Submenu for selecting the :EXTernal trigger input DISabled / :MODe TRIGger / Selects the trigger mode GATe / REARM Choose the gate level threshold to trigger on :LEVel 0.2 - 15[V] which should be set to ~ 50% of the input voltage. Selects which edge (rising :EDGe RISing / FALLing...
- Page 31 *Note: The commas should be omitted. Sets the T period. The command should be sent without units. If for example 200[ns] – 1000[s] :PERiod 200ns is desired the parameter sent should be 200e-9, or the decimal equivalent. Sets the system resolution between 4 or 5ns.
- Page 32 Decimal representation of a :MUX 0-15 6 bit binary number (example: 15 = 1111) NORMal / Normal is active HIGH, :POLarity COMPlement / Inverted and Complement INVerted are active LOW. Command to change the channels‟ output :OUTPut parameters. Allows the user to select :AMPLitude 3.3 - 5 [V] adjustable TTL/CMOS...
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Page 33: Ieee 488.2 Common Commands
Command to set the :COMMunicate communication settings. :USB Command to Enable/Disable the echo function on the USB interface. The Echo :ECHo 0/1 or OFF/ON function will cause the unit to repeat the command received to the PC. When the unit is powered up, if this command is :AUTorun 0/1 or OFF/ON... -
Page 34: Appendix A - Specifications
Cleaning Instructions: Light dusting with cloth damp with water and/or usage of compressed a ir is all that is needed. 525 Specifications UNIT I/O Configuration 525 – 6 Independent Channels Model/Outputs 1 Selectable Clock Output Inputs 1 Selectable Trigger/Gate Input... - Page 35 Channel Timing Generator Pulse Width Range 1,000 Width Accuracy 4/5ns + [0.0001 x (width + delay)] Width Resolution Pulse Delay Range -1,000 1,000 Delay Accuracy 4/5ns + (0.0001 x delay) Delay Resolution Jitter (Channel to Channel) ps(RMS) Any/all channels may be OR‟d to any/all outputs Multiplexer Time Base Same as internal rate generator...
- Page 36 Output Module Output Impedance Ohms 3.3 – 5.0 VDC into ≥ 1K ohm Output Level 1.7 – 2.5 VDC into 50 ohm Resolution 5mA typical into 1K ohm Output Current 50mA typical into 50 ohm < 2ns typical @ 5V (High Imp) Rise Time (10% - 90%) <...
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Page 37: Appendix D - Tz50 (Impedance Match Option)
This “TZ50” option allows a user to terminate into a 50 Ohm load while maintaining output amplitudes of at least 4 Volts. All other functionality of the module is the same as the 525. The output may be adjusted accordingly as before;... -
Page 38: Terminating Into High Impedance
Figure D.1 – TZ50 Option Into 50 Ohm Load 11.1.3 Terminating Into High Impedance The following figure shows a pulse when set to 5V upon being terminated into high impedance: Figure D.2 – TZ50 Option Into High Impedance Load... -
Page 39: Appendix E - Safety Symbols
12 Appendix E – Safety Symbols 12.1 Safety Marking Symbols This section provides a description of the safety marking symbols that may appear on the instrument. These symbols provide information about potentially dangerous situations which can result in death, injury, or damage to the instrument and other components. - Page 40 ISO 3864, No. B.3.6 Caution, risk of electric shock Background color - yellow; symbol and outline - black IEC 417, No. 5041 Background color - Caution, hot surface yellow; symbol and outline - black Caution (refer to accompanying documents) used to direct the user to the instruction manual where it is necessary to follow ISO 3864, No.
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