Model 710 Quad 1-kV Bias Supply Operating and Service Manual
Contents
1. Nominally 100 ms DISPLAY RANGES 0 to 100 V in 0 1 V steps on the 100 V range 0 to 1000 V in 1 V steps on the 1000 V range and 0 to 19 99 HA in 0 01 HA steps for current DISPLAY NONLINEARITY lt 0 05 of full scale for voltage from 0 to 100 V or from 0 to 1000 v and current from 0 to 10 HA DISPLAY UNCERTAINTY least significant digit DISPLAY TEMPERATURE SENSITIVITY lt 50 ppm C for 0 to 50 C 2 2 CONTROLS AND INDICATORS MASTER ON OFF Common to all channels Front panel 2 position toggle switch enables or disables all four supplies OVERLOAD RESET common to all channels Front panel momentary push button switch that clears the overload shutdown on any channel after a current overload See OVL LED VOLTS CURRENT common to all channels Front panel 8 position rotary switch selects the parameter to be read from the display Either the output voltage or the output current of each of the four supplies can be selected DISPLAY common to all channels Front panel 3 digit LED display monitors either the voltage or current of the supply selected by the VOLTS CURRENT rotary switch POLARITY JUMPER 1 per channel Internal printed circuit board jumper selects either positive or negative output polarity POS NEG LEDs 2 per channel Front panel green LEDs indicate the polarity of the HV OUTPUT POS is on for positive or NEG is on for negative output polarity RANGE 1 per channel Front panel 32. a VACUUM SHUTDOWN occurs and the OVERLOAD RESET button must be pressed to reactivate the bias voltages The rear panel overload shutdown alarm output generates a low TTL level whenever an overload or vacuum shutdown has occurred in the Model 710 This output can be connected to a computer or other suitable alarm to stop the measurement and prevent the collection of faulty data The overload shutdown alarm outputs from a number of Model 710 modules can be connected together to generate a common alarm signal 2 SPECIFICATIONS The Model 710 contains four identical bias supplies with independently adjustable voltage and polarity The specifications apply to each of the four channels unless noted otherwise 2 1 PERFORMANCE POLARITY Positive or negative polarity independently selectable for each channel by printed circuit board jumpers Specifications subject to change without notice OUTPUT VOLTAGE RANGE Front panel switch selectable as 0 to 100 V or 0 to 1 kV OUTPUT CURRENT RANGE Internally limited to 20 HA on each output OUTPUT VOLTAGE ACCURACY 0 25 of full scale VOLTAGE CONTROL RESOLUTION 0 5 V on 1000 V range 0 05 V on the 100 V range OUTPUT VOLTAGE REGULATION lt 0 001 or 1 mV whichever is greater OUTPUT VOLTAGE TEMPERATURE SENSITIVITY lt 30 ppm C FOR 0 TO 50 OUTPUT VOLTAGE LONG TERM INSTABILITY lt 0 001 24 hours OUTPUT RIPPLE lt 2 mV peak to peak 5 Hz to 100 MHz OUTPUT RISE TIME
3. pass a stringent set of quality control tests designed to expose any flaws in materials or workmanship Permanent records of these tests are maintained for use in warranty repair and as a source of statistical information for design improvements Repair Service If it becomes necessary to return this instrument for repair it is essential that Customer Services be contacted in advance of its return so that a Return Authorization Number can be assigned to the unit Also ORTEC must be informed either in writing by telephone 865 482 4411 or by facsimile transmission 865 483 2133 of the nature of the fault of the instrument being returned and of the model serial and revision Rev on rear panel numbers Failure to do so may cause unnecessary delays in getting the unit repaired The ORTEC standard procedure requires that instruments returned for repair pass the same quality control tests that are used for new production instruments Instruments that are returned should be packed so that they will withstand normal transit handling and must be shipped PREPAID via Air Parcel Post or United Parcel Service to the designated ORTEC repair center The address label and the package should include the Return Authorization Number assigned Instruments being returned that are damaged in transit due to inadequate packing will be repaired at the sender s expense and it will be the sender s responsibility to make claim with the shipper Instruments not in warra
4. HINS FAELATION ER MA RE OR ORE NE N N N N EN EE anh Aa 3 3 1 POWER CONNECTION ee ee Ee Se ee Se ee ee ee ee ee ee ee ee K ee ee 3 3 2 INTERNAL JUMPER SELECTIONS ei ee Se ee GE Se ee ee ee ee ee ee 3 3 3 VACUUM SHUTDOWN SHUTDOWN ALARM AND REMOTE PROGRAMMING 3 4 OPERATION EE se Settee RE OE Ra Nel DE aed RN EE oR Net AE NE EE ED E 4 41 INTIAL TES TING ESE ok aaa A halla ht alle alt ala ad aaah ee ee a 4 4 2 POLARITY SELECTION AND INDICATION ee EE Ee Se ee ee ee ee 4 4 3 VOLTAGE RANGE AND DISABLE 00 000 e cee 4 4 4 _DISPLAY SELECTION ig tc se sees ees ie else legis gloves slegte slee slee see giere glos gloeu gles 4 4 5 BIAS VOLTAGE SELECTION isc see Gig te Sone Gee DR Ge De Ee dee se ee ee Ee ese Ge ee ee ee ee ee eg Ee stone 4 4 6 OVER CURRENT AND VACUUM SHUTDOWN 0 0 eee 5 4 7 UNDESIRABLE LEAKAGE CURRENTS 0 000 e eee tee 5 4 8 DETERMINATION OF ACTUAL DETECTOR BIAS 0 0 ee Ee ee eee 5 4 9 DETECTOR CONSIDERATIONS AT HIGH BIAS VOLTAGES 00 00000005 5 Br SMAINTENANG Esp lee Ga ua ee uote iat eat N AE ee AG AE EA KONENE ENEAS MINEA TATAIA E AE AAS bade 6 5 1 TESTING PERFORMANCE OF BIAS SUPPLIES ii SE Se SE Se Se eee 6 5 2 TROUBLESHOOTING SUGGESTIONS 0 eee ae 6 DBs HAE R AIRS ce En GE EG GE RE GEES ded dav EE ede Cae EG E DS 6 SAFETY INSTRUCTIONS AND SYMBOLS This manual contains up to three levels of safety instructio
5. Printed in U S A Model 710 Quad 1 kV Bias Supply Operating and Service Manual ORTEC Part No 761850 Manual Revision F 1202 Advanced Measurement Technology Inc a k a ORTEC a subsidiary of AMETEK Inc WARRANTY ORTEC warrants that the items will be delivered free from defects in material or workmanship ORTEC makes no other warranties express or implied and specifically NO WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ORTEC s exclusive liability is limited to repairing or replacing at ORTEC s option items found by ORTEC to be defective in workmanship or materials within one year from the date of delivery ORTEC s liability on any claim of any kind including negligence loss or damages arising out of connected with or from the performance or breach thereof or from the manufacture sale delivery resale repair or use of any item or services covered by this agreement or purchase order shall in no case exceed the price allocable to the item or service furnished or any part thereof that gives rise to the claim In the event ORTEC fails to manufacture or deliver items called for in this agreement or purchase order ORTEC s exclusive liability and buyer s exclusive remedy shall be release of the buyer from the obligation to pay the purchase price In no event shall ORTEC be liable for special or consequential damages Quality Control Before being approved for shipment each ORTEC instrument must
6. Reset the power supply Increase the potentiometer associated with channel 1 to 1000 V and check for the output voltage for 1000 3 V Also check for agreement between the Model 710 s voltage meter and the test voltmeter 6 Reduce the potentiometer back to zero stopping occasionally to check the potentiometer linearity by comparing the output voltage to the potentiometer dial reading 7 Repeat the above steps for channels 2 3 and 4 8 Turn the master ON OFF switch to the OFF position and turn the voltage range switch of each channel to DISABLE 9 Remove the Model 710 from the NIM standard bin and allow 30 seconds for the supply to fully discharge then remove the right side panel and set the polarity of each channel to negative 10 Repeat steps 1 7 11 Set the output voltage to zero and connect output 1 to the ac coupled input of a 100 MHz oscilloscope with a coaxial cable Increase the output voltage of all four channels to 1000 V and check the ripple of channel 1 It should be less than 2 mV peak to peak n Pe 5 2 TROUBLESHOOTING SUGGESTIONS 1 Ensure that the proper dc voltages are being supplied to the module 2 Turn the master ON OFF switch to the OFF position and wait for 30 seconds then ensure that the output is not shorted 5 3 REPAIRS This instrument can be returned to the ORTEC factory for service and repair at a nominal cost Our standard procedure for repair ensures the same quality control and c
7. a O O1 HA resolution On each supply a three position locking toggle switch selects the 1 kV or the 100 V range of output voltage or disables operation of that supply The outputs of all active supplies are also controlled by the MASTER ON OFF switch A red LED on each supply indicates when its bias voltage is turned on Several features are incorporated to protect the detectors served by the Model 710 and to ensure the integrity of the data they are collecting Green LEDs indicate the polarity of the output voltage for each supply whenever the bin power is on and the output polarity selection jumpers are mounted on the printed circuit board If the detector current exceeds 20 HA the bias voltage for that detector turns off and the yellow overload LED turns on to indicate a shutdown condition That particular channel remains shut down until the fault is cleared and the OVERLOAD RESET button is pushed To protect the detectors and their associated preamplifiers against discharges in a partial vacuum the vacuum shutdown feature can be utilized A relay closure to ground or a low TTL signal from a trip level on a vacuum gauge can be applied to the VACUUM SHUTDOWN input to turn off all bias supplies in the case of a vacuum failure in the detector vacuum chamber A yellow front panel LED turns on to indicate that the vacuum shutdown has been activated Also for added safety all the supplies are placed in the overload condition when
8. ain amplifier or a rapid increase in detector current indicates that the detector is approaching the destructive breakdown voltage It is important to follow the detector manufacturer s directions when applying voltage to the detector 5 MAINTENANCE 5 1 TESTING PERFORMANCE OF BIAS SUPPLIES The following is intended as a guide in the installation and checkout of the Model 710 Quad Detector Bias Supply The following or equivalent test equipment is needed BEATER Elana ROW Supply such as Osgillascops yuijh an input coupling capacitor Voltmeter with an jgput impedance of gt 50 MO Before making the performance test take the following preliminary steps 1 Visually check the module for possible damage due to shipment 2 Set the polarity jumpers of all four supplies to positive and the mode jumpers to internal 3 Connect ac power to the NIM standard Bin 4 Plug the Model 710 into the Bin and check for proper mechanical alignment 5 Ensure that the ON OFF switch is in the OFF position and that all four voltage range switches are in the DISABLE position 6 Switch on the ac power and check the dc power supply voltages at the test points on the NIM standard power supply control panel To check the performance of the Model 710 make the following test 1 Set the bias selector potentiometers to zero 2 Set the voltmeter to the 2000 V scale and connect it to output 1 Set the voltage range switch to 1000 V
9. connected to this input Used with the trip level on a vacuum gauge to turn off the detector bias voltage when vacuum is lost in the chamber containing the detectors REMOTE INPUT 1 per channel Rear panel BNC connector accepts a 0 to 10 V input that controls the output voltage from 0 to full scale Active only when the REMOTE INPUT is selected by the VOLTAGE CONTROL JUMPER 2 4 OUTPUTS HV OUTPUT 1 per channel Rear panel SHV connector supplies the 0 to 100 V or 0 to 1000 V bias voltage output OVL SHDN ALARM common to all channels Rear panel BNC connector provides an open collector active low TTL compatible signal if a vacuum shutdown or an overcurrent shutdown on any of the four channels has occurred An external pull up resistor to 5 V is required OVL SHDN ALARM outputs from other Model 710 modules can be connected in parallel to produce a common alarm to signal a detector failure or a vacuum failure in the experiment 2 5 ELECTRICAL AND MECHANICAL POWER REQUIRED The Model 710 derives its power from a NIM bin supplying 24 V and 12 V such as the ORTEC Model 4001A 4002A NIM Bin Power Supply The power required is 24 V at 90 mA 12 V at 390 mA 12 V at 360 mA and 24 V at 90 mA WEIGHT Net 1 4 kg 3 2 Ib Shipping 2 9 kg 6 4 Ib DIMENSIONS Standard double width NIM module 6 90 x 2 13 cm 2 70 X 8 714 in front panel per DOE ER 0457T 3 INSTALLATION 3 1 POWER CONNECTION The Model 710
10. g voltage should correspond to the output voltage One volt of the remote programming signal is equivalent to one turn of the potentiometer Fig 4 1 Changing the High Voltage Output Polarity A For Positive HV plug the Printed Wiring Board PWB into the lowermost toward the bottom of the module set of pin sockets B For Negative HV plug the PWB into the uppermost toward the top of the module set of pin sockets vey P Setting Voltage Control Make Settings as Required Q to all Channels o For Front Panel External Control Potentiometer from rear panel Control Remote Input BNC Fig 4 2 Jumper Positions for Selecting the Remote Input or the Front Panel VOLTAGE Potentiometer to Control the Output Voltage 4 6 OVER CURRENT AND VACUUM SHUTDOWN If an over current is detected the channel with the over current is disabled This channel will remain disabled until the front panel push button reset switch is pressed The over current threshold is set at the factory to 20 HA When NIM power is applied the Model 710 turns On in the over current conditions Thus the supply must be reset for operation In addition to the over current condition all four channels of the Model 710 can be disabled by applying a low TTL signal or a resistance of less than 75 to ground to the rear panel vacuum shutdown BNC connector In this condition the supplies will remain disabled until the TTL signal goes high or the re
11. heckout that are used for anew instrument Always call Customer Service at ORTEC 865 482 4411 before sending in an instrument for repair to obtain shipping instructions so that the required Return Autorization Number can be assigned to the unit This number should be marked on the address label and on the package to ensure prompt attention when the unit reaches the factory Bin Module Connector Pin Assignments For Standard Nuclear Instrument Modules per DOE ER 0457T a 5 Function 3 V 3V Spare bus Reserved bus Coaxial Coaxial Coaxial 200 V dc Spare 10 6V 11 6V 12 Reserved bus 13 Spare 14 Spare 15 Reserved 46 12V 17 12V 18 Spare bus 19 Reserved bus 20 Spare 21 Spare 22 Reserved OO ONOU POND 41 Function Reserved Reserved Reserved Spare Spare 24 V 24 V Spare bus Spare Spare 117 V ac hot Power return ground Reset Scaler Gate Reset Auxiliary Coaxial Coaxial Coaxial 117 V ac neutral High quality ground Ground guide pin Pins marked are installed and wired in ORTEC s 4001A and 4001C Modular System Bins
12. ircuit board jumper The left side panel must be removed to set the polarity jumpers The side panels should not be removed until the supply is fully discharged The jumper for each channel should be positioned as shown in Fig 4 1 for the polarity desired 4 3 VOLTAGE RANGE AND DISABLE The voltage range for each channel is independently selected by front panel 3 position toggle switches Full scale voltages of 100 or 1000 V can be selected Each of the four channels can also be disabled by this switch wa oo 0 eS Q Eg oN 000007 N M FI SS MES 4 4 DISPLAY SELECTION One front panel LED display is provided to monitor the voltage and current of each channel The parameter to be displayed is selected by a front panel 8 position rotary switch If one of the four voltages is being displayed the full scale range of the display is determined by the voltage range selected for that channel The full scale current range is always 19 99 HA 4 5 BIAS VOLTAGE SELECTION The bias voltage for each channel can be set by the front panel VOLTAGE potentiometer for that channel or a 0 to 10 V remote programming signal can be injected into the rear panel REMOTE INPUT BNC for that channel The potentiometer or remote programming control for each channel is selected by internal printed circuit board jumpers as shown in Figure 4 2 The Model 710 is calibrated so that the dial reading or remote programmin
13. ns that must be observed in order to avoid personal injury and or damage to equipment or other property These are DANGER Indicates a hazard that could result in death or serious bodily harm if the safety instruction is not observed WARNING Indicates a hazard that could result in bodily harm if the safety instruction is not observed CAUTION Indicates a hazard that could result in property damage if the safety instruction is not observed Please read all safety instructions carefully and make sure you understand them fully before attempting to use this product In addition the following symbol may appear on the product ATTENTION Refer to Manual AN DANGER High Voltage Please read all safety instructions carefully and make sure you understand them fully before attempting to use this product SAFETY WARNINGS AND CLEANING INSTRUCTIONS DANGER Opening the cover of this instrument is likely to expose dangerous voltages Disconnect the instrument from all voltage sources while it is being opened WARNING Using this instrument in a manner not specified by the manufacturer may impair the protection provided by the instrument Cleaning Instructions To clean the instrument exterior Unplug the instrument from the ac power supply Remove loose dust on the outside of the instrument with a lint free cloth Remove remaining dirt with a lint free cloth dampened in a general purpose detergent and water solution Do not
14. nty should follow the same procedure and ORTEC will provide a quotation Damage in Transit Shipments should be examined immediately upon receipt for evidence of external or concealed damage The carrier making delivery should be notified immediately of any such damage since the carrier is normally liable for damage in shipment Packing materials waybills and other such documentation should be preserved in order to establish claims After such notification to the carrier please notify ORTEC of the circumstances so that assistance can be provided in making damage claims and in providing replacement equipment if necessary Copyright 2002 Advanced Measurement Technology Inc All rights reserved ORTEC is a registered trademark of Advanced Measurement Technology Inc All other trademarks used herein are the property of their respective owners CONTENTS WARBANT Ys ER Ee acacia sg aha aha RE Ge RE GREG AR RE GE EE be Ee RE aan alae ii SAFETY INSTRUCTIONS AND SYMBOLS 0 iv SAFETY WARNINGS AND CLEANING INSTRUCTIONS 00 00 Ee ee eee v 1 DESCRIPTION RE e a E OAR RR AN NA AA AA A 1 2 SPEGIFIGATIONSS MEE EE RE RR ER EE VI DIN 1 2 1 PEREORMANGE EE EE ER RE ER Ee ER Ee i ee a Ee ER Re ER RE a Ee EG EE Ee Ee Re Ee Ke Gee Re 1 2 2 CONTROLS AND INDICATORS EE SE EG Ee SE ee ee ee ee ee ee 2 2 8 INPUTS EE SEE EDE EE SE GE ED DE DE 2 24 OUTPUT Se ee nat ai 3 2 5 ELECTRICAL AND MECHANICAL 0 00 00 ene eee 3 S
15. operates on power that must be provided by a NIM standard bin and power supply such as the ORTEC 4001A 4002A series Convenient test points on the bin power supply control panel should be used to check that the dc voltage levels are not overloaded The bin and power supply are designed for relay rack mounting If the equipment is rack mounted be sure that there is adequate ventilation to prevent any localized heating of the components that are used in the Model 710 The temperature of equipment mounted in racks can easily exceed the maximum limit of 50 C unless precautions are taken 3 2 INTERNAL JUMPER SELECTIONS Before the Model 710 is installed in the NIM standard bin the polarity and programming mode local or remote printed circuit board jumpers should be set Refer to Section 4 for information about the proper setting of these jumpers 3 3 VACUUM SHUTDOWN SHUTDOWN ALARM AND REMOTE PROGRAMMING The vacuum shutdown input shutdown alarm output and remote programming inputs are located on the rear panel of the Model 710 It is more convenient to make these connections before the instrument is installed in the NIM bin Refer to Section 4 for more information about these features 4 OPERATION 4 1 INITIAL TESTING Refer to Section 5 of this manual for information concerning testing performance 4 2 POLARITY SELECTION AND INDICATION The polarity of each of the four channels is independently selected by a printed c
16. position locking toggle switch selects a full range output voltage of 0 to 100 V or 0 to 1 kV or disables the output ON LED 1 per channel Front panel red LED is on if the supply is enabled and has not experienced a vacuum shutdown or current overload VOLTAGE CONTROL 1 per channel Front panel 10 turn precision potentiometer with locking graduated dial provides a continuously variable output voltage from 0 to 100 V or from 0 to 1 kV depending upon the VOLTAGE RANGE setting Also see VOLTAGE CONTROL JUMPER VOLTAGE CONTROL JUMPER 1 per channel Internal printed circuit board jumper selects either the REMOTE INPUT or the front panel VOLTAGE CONTROL potentiometer as the source that sets the output voltage Normally set to the VOLTAGE CONTROL potentiometer position OVL LED 1 per channel Front panel yellow LED is on if the supply has been shut down because the current demanded from the HV OUTPUT exceeded 20 HA See OVERLOAD RESET VACUUM SHUTDOWN LED common to all channels Front panel yellow LED is on if a vacuum shutdown has been triggered See VACUUM SHUTDOWN input 2 3 INPUTS VACUUM SHUTDOWN common to all channels Rear panel BNC connector disables all supplies and turns on the VACUUM SHUTDOWN LED if a low TTL signal or a resistance to ground less than 75 Q is applied The supplies are enabled and the VACUUM SHUTDOWN LED turns off when a high TTL signal or a resistance to ground greater than 5 KQ is
17. sistance to ground becomes greater than 5 KO and the OVERLOAD RESET button has been pressed 4 7 UNDESIRABLE LEAKAGE CURRENTS The detector current metering circuit indicates currents due to all leakage paths beyond the meter in the circuit Included is any leakage in the filter components or wiring of the detector control unit as well as the leakage due the insulation resistance of all cables connectors and components which connect the unit to the detector These currents must be made negligibly small or be accounted for in the determination of the actual detector current Because the meter can indicate currents as low as 10 nA and the voltage can be as high as 1000 V resistances on the order of 1 x 10 are significant It may not always be practical to reduce the leakage in external cables and connections to insignificant magnitudes In such cases it may suffice to note the residual current with all wiring in place and the detector unconnected and subtract this current from the indicated current to obtain the actual detector current If the leakage phenomenon is essentially a resistance then its value may be computed from Ohm s law for use in determining the residual current at various voltages without the necessity of actual measurements 4 8 DETERMINATION OF ACTUAL DETECTOR BIAS In addition to its use as an indicator of the physical condition of the detector the current reading allows accurate determination of
18. the actual detector bias voltage This actual voltage differs from that indicated by the amount of voltage dropped across the detector load and filter resistors due to the detector current Accurate determination of the actual detector voltage is needed since it is an important parameter in both the depleted sensitive depth of the detector and the collecting field strength To calculate the actual detector voltage the sum of all series resistance between the bias supply and the detector must be known The internal resistance of the Model 710 is extremely small and can be neglected The value of the detector filter resistors can usually be obtained from the schematic diagram of the preamplifier After the total series resistance is known the bias voltage across the detector can be calculated using Ohm s law 4 9 DETECTOR CONSIDERATIONS AT HIGH BIAS VOLTAGES Semiconductor radiation detectors that utilize more than a few hundred volts of bias usually require some care in the application of the bias to reduce the risk of damaging the detector It is helpful to observe the noise output of the main amplifier with an oscilloscope while the bias is being increased Small breakdown phenomena which decay in less than one minute can be observed after a bias increase For greatest safety it is advisable to approach the final bias in small increments with brief aging periods between the steps A rapid increase in output noise from the m
19. use abrasive cleaners CAUTION To prevent moisture inside of the instrument during external cleaning use only enough liquid to dampen the cloth or applicator Allow the instrument to dry completely before reconnecting it to the power source 1 0oy r EEE GLOIE Em o 5 Bal d DO1EASLE vi VACUUM A W SHUTDOWN Rear Panel ORTEC MODEL 710 QUAD 1 kV BIAS SUPPLY 1 DESCRIPTION The Model 710 Quad 1 kV bias supply contains four high voltage power supplies that have independently selectable output voltages and polarities Each supply can deliver an output voltage that is continuously adjustable over the range of from O to 100 V or from 0 to 1 kV with a maximum output current of 20 UA The Model 710 is ideal for providing the bias voltage for solid state charged particle detectors It can also be used with ionization chambers and proportional counters that operate within the range of voltage and current delivered by the Model 710 On each supply a 10 turn locking dial adjusts the output voltage with a control resolution of 0 05 of full scale Feedback regulation ensures an output voltage accuracy within 0 25 of full scale The output voltage or output current of any of the four supplies can be selected for monitoring on the 31 2 digit LED display This is useful when initially determining the correct bias voltage for a solid state detector Detector bias currents from 0 01 to 19 99 HA can be measured with
Download Pdf Manuals
Related Search