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Model 428

Detector Bias Supply

Operating and Service Manual

Printed in U.S.A.

ORTEC

®

Part No. 733220

062020

Manual Revision D

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Содержание ORTEC 428

Страница 1: ...Model 428 Detector Bias Supply Operating and Service Manual Printed in U S A ORTEC Part No 733220 062020 Manual Revision D ...

Страница 2: ...o 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 proc...

Страница 3: ...INSTRUCTIONS 2 4 1 INITIAL TESTING 2 4 2 POLARITY SELECTION 2 4 3 BIAS VOLTAGE INDICATOR LIGHT 2 4 4 BIAS VOLTAGE SELECTORS 3 4 5 CURRENT MONITOR JACKS 3 4 6 UNDESIRABLE LEAKAGE CURRENTS 4 4 7 DETERMINATION OF ACTUAL DETECTOR BIAS 4 4 8 GUARD RING VOLTAGE SUPPLY 4 4 9 DETECTOR CONSIDERATIONS AT HIGH BIAS VOLTAGES 5 5 MAINTENANCE 5 5 1 TESTING PERFORMANCE OF BIAS SUPPLY 5 5 2 ADJUSTMENTS 6 5 3 TROU...

Страница 4: ...s 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...

Страница 5: ...the instrument during external cleaning use only enough liquid to dampen the cloth or applicator SAFETY WARNINGS AND CLEANING INSTRUCTIONS 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 ...

Страница 6: ...vi ...

Страница 7: ...n and Power Supply through the rear module connector WARNING 2 SPECIFICATIONS PERFORMANCE NOISE AND RIPPLE 0 0002 TEMPERATURE STABILITY 0 03 EC 0 to 50EC LINE STABILITY Directly proportional to dc power supply stability 0 02 for 105 to 125 V ac when using ORTEC 4002A CONTROLS BIAS CONTROLS Aand B 10 turn direct reading potentiometers POS OFF NEG Front panel switch to control bias polarity Off posi...

Страница 8: ...d bias voltage output connectors are located on the front panel The output connectors are the type SHV and are not compatible with ordinary BNC connectors A perforated shield encloses the unit so that high voltages are not exposed WARNING Tip jacks are provided for monitoring the current in each detector See Section 4 5 for information on appropriate dc meters Always have power for the 428 turned ...

Страница 9: ...current is measured by connecting a floating ammeter or voltmeter to the Current Monitoring jacks as shown in Fig 4 1 If an electronic type of meter operated from the power line is used the input circuit must be capable of floating above earth and power line ground so that the leakage to ground does not load the bias supply The low impedance side of the meter must be connected to the black tip jac...

Страница 10: ...ross the detector load and filter resistors due to the detector current Accurate determination of actual detector voltage is important since it is an important parameter in both the depleted sensitive depth of the detector and the collecting field strength To obtain the actual detector voltage one must know the sum of all series resistances in the circuit between voltage source and detector The re...

Страница 11: ...check for proper mechanical alignment 4 Ensure that the Polarity Selection switch on the ORTEC 428 is in the Off position 5 Switch on the ac power and check the dc Power Supply voltages at the test points on the 401 Power Supply control panel To check the performance of the 428 make the following tests 1 Set the bias selector potentiometers to zero 2 Set the voltmeter to the 1000 V scale and conne...

Страница 12: ...ate the unit for both positive and negative polarity 8 Reduce the potentiometer to zero and check the output voltage versus the potentiometer dial reading at several points Resistors R15 and R 17 provide a method of measuring the detector current with a voltmeter See Section 4 5 for details If these resistors are shorted the output impedance will be reduced by 1 MÙ Resistors R 18 and R 19 limit th...

Страница 13: ...served bus 34 Power return ground 13 Spare 35 Reset Scaler 14 Spare 36 Gate 15 Reserved 37 Reset Auxiliary 16 12 V 38 Coaxial 17 12 V 39 Coaxial 18 Spare bus 40 Coaxial 19 Reserved bus 41 117 V ac neutral 20 Spare 42 High quality ground 21 Spare G Ground guide pin 22 Reserved Pins marked are installed and wired in ORTEC s 4001A and 4001C Modular System Bins Bin Module Connector Pin Assignments For...

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