BNC 202H Instruction Manual
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BNC 202H Instruction Manual

Electrical module
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Instruction Manual
Electrical Module
Model 202H
2955 Kerner Blvd., Suite D San Rafael, CA 94901. Ph: 415-453-9955 Fx: 415-453-9956
www.berkeleynucleonics.com

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Summary of Contents for BNC 202H

  • Page 1 Instruction Manual Electrical Module Model 202H 2955 Kerner Blvd., Suite D San Rafael, CA 94901. Ph: 415-453-9955 Fx: 415-453-9956 www.berkeleynucleonics.com...
  • Page 2 WARRANTY Berkeley Nucleonics Corporation warrants all instruments, including component parts, to be free from defects in material and workmanship, under normal use and service for a period of one year. If repairs are required during the warranty period, contact the factory for component replacement or shipping instructions.

  • Page 3: Table Of Contents

    CONTENTS Page SECTION 1 SPECIFICATIONS Model 202H Characteristics Module Status Byte Summary SECTION 2 OPERATING INFORMATION Description General Power Up Module Installation Warm Up Requirements Protection Features Short Circuit Protection Over Voltage Protection Over Current Protection Over Temperature Protection Load Requirements...
  • Page 4 CONTENTS SECTION 4 MAINTENANCE AND CALIBRATION Calibration General Equipment Required Procedure Power Supply Voltages Output Pulse Amplitude Stepcal Adjustment Drive Level Adjustment Minimum Pulse Width Calibration SECTION 5 PARTS LIST & SCHEMATICS Parts List Schematics Contact Factory for Copies...
  • Page 5 Module Interface Block Diagram Output Circuit Block Diagram TABLES Table No. Page 202H Module Status Byte Typical Duty Factor Maximums for the 202H Module Typical Pulse Width Correction Factors 202H Module Default Settings Menu Keys for the 202H Module Module Memory Map...
  • Page 6 SAFETY PRECAUTIONS The following warnings, which appear both here and in the main body of the text, are to alert the user to potential safety hazards and to encourage safe operating practices. WARNING Hazardous shock can result from improper operation-up to 2 kW peak power may be contacted.
  • Page 7 CAUTION: Loads connected to the 202H module must be able to dissipate up to 2 kW peak power and 20 W average power for 300 V operation. Loads with either lower peak or average power...
  • Page 8 MODEL 202H (Model 202H Graphic) The Model 202H is one in a series of output plug-in modules that provide electrical and optical pulses when installed in the 6040 mainframe. This particular module provides positive or negative electrical pulses with adjustable amplitude up to 30V...

  • Page 9: Section 1 Specifications

    SECTION 1 SPECIFICATIONS MODEL 202H CHARACTERISTICS Timing Characteristics Rep Rate: 0 Hz - 500 kHz at 300 V (1 MHz at lower amplitudes see Table 2-1). Delay: 0 ns - 640 s. Width: 15 ns - 5 ms. Width Accuracy: Duplicates 6040 width ±2 ns.
  • Page 10 SPECIFICATIONS Modes PULSE Single Pulse: Conventional pulse generator with rate, delay and width controlled by the 6040 mainframe. Double Pulse: A pair of identical pulses of the selected width with leading edges separated by the selected delay. Module Memory PERMANENT MEMORY: A ROM in a module determines the instrument's allowable operating conditions and display units.

  • Page 11: Module Status Byte Summary

    SPECIFICATIONS MODULE STATUS BYTE SUMMARY Table 1-1. 202H Module Status Byte Description Polarity Always Zero Always Zero Always Zero Always Zero Always Zero Locked Overload...

  • Page 12: Section 2 Operating Information

    The 202H operates only in the Pulse Mode of the 6040 mainframe, supplying flat-topped pulses of positive or negative polarity. The 202H's Peak Level is adjustable from 20 V to 300 V and the Baseline level is fixed at ground. The leading edge transition time is 5 ns or less (trailing edge transition time is minimum at 300 V and increased with reduced amplitude).

  • Page 13: General

    Short Circuit Protection If a short or near-short appears at the output while the 202H is producing a pulse, the module will respond by rapidly turning off the pulse being generated. This protects the 202H output stage from damage. It takes effect if the short is present when the pulse begins (even if the short is present before...

  • Page 14: Over Voltage Protection

    While the instrument is current limiting, the active front panel polarity LED will flash (and the Overload bit of the Module Status byte will be set). When the cause of the current limit condition is removed, the 202H output will slowly rise until it again produces pulses of accurate output level.

  • Page 15: Timing Requirements

    OPERATING INFORMATION The 202H is designed to operate with a load impedance of 50 ohms. For operation at 300 V, the load must be rated for 2 kW peak power and 20 W average power dissipation. (Terminators of sufficient power rating are available from BNC.) Note that the failure modes for loads with insufficient power ratings may vary.

  • Page 16: Pulse Spacing

    If this minimum spacing is not met, output pulses may disappear. Pulse Width The maximum pulse width is limited to 5 ms at all output levels. The 202H will not allow longer width settings to be entered.

  • Page 17: Minimum Pulse Width

    Non 50 Ohm Loads In some cases, the 202H can be used with other than 50 ohm loads. When doing so, the instrument will be uncalibrated, and the specifications will not apply. The use of a non 50 ohm load will mean an impedance mismatch or discontinuity at the load. This mismatch will result in reflections of the output pulse as it reaches the load.

  • Page 18: Troubleshooting

    Full Duplex Remote Enable The Quick Test procedure for the mainframe may be applied to the 202H by selecting the Pulse Mode and following the test sequence using the module's PULSE OUT connector in place of the mainfame's PULSE OUT.

  • Page 19: Front Panel Description

    WARNING: Shock hazard. Use extreme care when handling output connections. Rear Panel Description The rear panel of the 202H module has a mounting screw (for installation into the mainframe), one 40-pin edge connector, and one slide-one coaxial connector. The 40-pin connector allows the 6040 mainframe to control and communicate with the module and also supplies the power to the module.

  • Page 20: Mainframe Operation

    This section presents information on how to operate the Model 6040 Universal Pulse Generator with the Model 202H 300 V module installed. Only the details that are specific to the module are described. For an overall description of how to use the mainframe with plug-in modules, please refer to the 6040 manual.
  • Page 21 Status byte will be low. {UNITS} This key is not used with the 202H module (and has no effect). These keys are not used with the 202H module (and have no effect). FUNCTION These keys are not used with the 202H module (and have no effect).

  • Page 22: Remote Programming

    The Module Status command, the only command that is specific to the 202H module, will be described here. Module Status: This command returns the Module Status byte for the 202H.
  • Page 23 OPERATING INFORMATION Module Status Byte: Description Polarity Always zero Always zero Always zero Always zero Always zero Locked Overload Bit 7: This bit is set if the module is configured (by the internal switch) to produce pulses of negative polarity. The bit is zero for positive polarity. If the level is programmed to 0 V, the status of this bit is undetermined.

  • Page 24: Section 3 Theory Of Operation

    (DAC). It is passed on to the Output board as the PEAK LEVEL signal (BASELINE and EXT DRIVE are not used for the 202H). This voltage ranges from 0V to –3V corresponding to pulse amplitudes of 0V and 300V. The polarity is determined by a switch in the output stage that is manually set before the plug-in is inserted into the 6040 mainframe.
  • Page 25 THEORY OF OPERATION The net result of the action of the control circuit is a relatively short settling time (about one second) and protection against overcurrent situations. The DRIVE waveform from the Timing Circuit of the 6040 is received and amplified through several stages of transistors and FETs and then applied to the gate of the output FET.
  • Page 26 THEORY OF OPERATION The voltage reference for the analog signals is CR1, a 6.2 V temperature compensated zener diode. Q1 is used to disable CR1 if the signal DAC EN is allowed to go up to +12 V. The Output board asserts this in the event of a Mode change or if any unusual conditions is detected.

  • Page 27: Output Board

    THEORY OF OPERATION Output Board (Schematic 202H-3D) DC CONTROL CURCUITS The PEAK LEVEL signal is received via P2 from the Peak Level DAC on the Interface board. This dc voltage ranges from 0 V to -3 V, corresponding to an output pulse magnitude of 0 V to 300 V.

  • Page 28: Floating Dc - Dc Converter

    THEORY OF OPERATION Since the entire output section floats (and in some instances jumps as much as 300 V with the output pulse), the drive edge pulses are passed through isolation transformers T1 and T2, following further level translation by Q20 and Q21. A collection of flip-flops and transistors on the floating output section are used for forming the signal that drives the gate of the output FET, Q7.

  • Page 29: Section 4 Maintenance And Calibration

    Be sure the ground conductor of the ac power cord connects the instrument to a solid earth ground. Calibration GENERAL It is recommended that calibration of the 202H module be verified every 12 months. The instrument requires warm up before beginning the calibration procedure. EQUIPMENT REQUIRED •...

  • Page 30: Procedure

    Set the scope terminator to 50 ohms. Turn on the 6040/202H. Set Level to 300 V, set Trigger to 1 kHz Internal Trigger, and set Width to 500 ns. Store these settings in memory 1.

  • Page 31: Drive Level Adjustment

    Turn the power back on and set Trigger to 1 kHz Internal Trigger, set Width to 500 ns, and set Level to 300 V. Using the DVM, measure the voltage between TP-2 and TP-6 on the Output board (PCB 202H-1). This is the voltage directly across the high voltage power supply, PS1. Compare this reading to the level of the output pulse top shown on the scope.

  • Page 32: Parts List

    SECTION 5 PARTS LISTS Abbreviations Ceramic Picofarad COMP Composition Single Inline Dual Inline Package Tantalum ELEC Electrolytic Microhenry FAC SEL Value Set at Factory Microfarad Kilohm Working Volts Megohm Variable Metal Film Watts Mica Wirewound MONO Monolythic Ceramic ------------------------- NOTE -------------------------- The number in the second column is the BERKELEY NUCLEONICS re-order number --------------------------------------------------------------...
  • Page 33 NOT USED 122-016 10F 10% 15 V TAN 110-033 0.1 F 20% 50 V CER MONO 110-033 0.1 F20% 50 V CER MONO OUTPUT BD, 202H-1 649-149 110-033 0.1F 10% 1 KVCER NOT USED 110-033 0.1 F20% 50 V CER MONO 122-013 3.3F 10% 15 V TAN...
  • Page 34 412-010 IN5234B 213-103 10 K 5% ¼W COMP 411-004 UB4152 213-105 1 M 5% ¼ W COMP 213-392 3.9 K 5% ¼ W COMP 411-004 IN4152 213-392 3.9 K 5% ¼ W COMP 411-004 IN4152 NOT USED 222-071 1 M 1% ¼ W MF NOT USED 212-274 270 K ½...
  • Page 35 214-472 4.7 K 5% ⅛ W COMP 214-027 2.70 OHM 5% ⅛ W COMP 213-820 82 OHM 5% ¼ W COMP 213-332 3.3 K 5% ¼ W COMP 213-332 3.3 K 5% ¼ W COMP 213-131 130 OHM 5% ¼ W COMP 213-331 330 OHM 5% ¼...

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