Tektronix AM-502 User's Manual
Contents
1. Switch Setting Output Freguency in Divisions 10 kHz 10 kHz 3 18 3 85 1 kHz 1 kHz 3 15 3 85 NOTE The components used in the 1 Hz position are also used in the other positions of the switch therefore the tolerance of the 1 Hz position is checked b Pressin the AM 502 input AC pushbutton Set the function generator controls for a 2 Hz output signal c Check the amplitude of the crt display for 3 15 to 3 85 divisions d Disconnect the 50 ohm cable from the AM 502 input connector and connect it to the input connector e Press in the AM 502 input GND pushbutton and input AC pushbutton Press to release the input GND pushbutton f Check the amplitude of the crt display for 3 15 to 3 85 divisions g Set the LF 3 dB switch to the DC OFFSET position Press in the AM 502 input GND pushbutton h Disconnect the 50 ohm cable from the AM 502 input connector 2 7 Specification and Performance Check AM 502 7 Check Overall Noise Tangentiaily Measured a Set the AM 502 GAIN control to 100K press in to release the input AC and GND pushbutton and the input AC pushbutton b Set the vertical amplifier deflection factor to 5 V div Set the time base sweep rate to 10 us div and the trigger source switch to external c Connect a 50 ohm termination to the AM 502 input connector connect four series connected 10X attenuators to the 50 ohm termination d Conne2. coupling capacitor fram damaging the circuit under test REV D SEP 1980 Section 1 AM 502 OPERATING INSTRUCTIONS installation and Removai CAUTION Turn the power module off before inserting the plug in otherwise damage may occur to the plug in circuitry Because of the high current drawn by the AM 502 it is also recommended that the power module be turned off before removing the AM 502 Refer to Fig 1 1 Check to see that the plastic barriers on the interconnecting jack of the selected power module compartment match the cut outs in the AM 502 circuit board edge connector Align the AM 502 chassis with the upper and lower guides of the selected compartment Push the module in and press firmly to seat the circuit board in the inter connecting jack To remove the AM 502 pull on the release latch located in the lower left corner until the interconnecting jack disengages and the AM 502 will slide out Controls and Connectors Refer to Fig 1 2 Even though the AM 502 is fully calibrated and ready to use the functions and actions of the controls and connectors should be reviewed before attempting to use it Pull the Power switch on the power module to apply power to the AM 502 The POWER indicator light indicates when power is applied to the AM 502 OPERATING CONSIDERATIONS Overheating The AM 502 is designed to operate at an ambient temperature from 0 to 50 C However when operating several power supplies
3. decreasing in a I F fashion to lt 600 nv Hz above 30 kHz 100 Mode Voltage Drift with Time Short Term 10 uV peak to peak per hour 2 2 REV C SEP 1980 Characteristics Long Term Voltage Drift with Temperature Table 2 1 cont input R and C Table 2 2 ENVIRONMENTAL Performance Requirements Specification and Performance Check AM 502 Supplemental Information 20 uV peak to peak per hour 100 uV per C Resistance 1 MQ Capacitance Approximately 47 pF Characteristics information Temperature Operating 0 C to 50 C Storage 40 C to 75 C Altitude To 15 000 feet maximun Operating operating temperature decreased by 1 C 1000 feet from 5000 to 15 000 feet Storage To 50 000 teet Vibration With the instrument complete Operating and Non operating Shock Operating and Non operating and operating vibration freq uency swept from 10 to 55 to 10 Hz at 1 minute per sweep Vibrate 15 minutes in each of the three major axes at 0 015 inch total displacement Hold 10 minutes at any major reson anace or in none at 55 Hz Total time 75 minutes 30 gs 1 2 sine 11 ms duration 2 shocks in each direction along 3 major axes for a total of 18 shocks Table 2 3 PHYSICAL CHARACTERISTICS H Characteristics information Overall Dimensions measured at maximum points Height 5 0 inches 12 7 centim
4. sont brevet s US et Etranger et les logotypes TEKTRONIX TEK SCOPE MOBILE sont 1973 1978 FIRER ET 7 kaz DAM TE HEN TEKTRONIX TEK SCOPE MOBILE SFOhAAAPAHOBBRRETT d pos s imprim aux USA TEKTRONIX se r serve le droit de modifier caract ristiques et prix dans le cadre de d veloppements techno logiques KETER HERUEBUFSTCHETAE Erani t INSTRUMENT SERIAL NUMBERS Each instrument has a serial number on a panel insert tag or stamped on the chassis The first number or letter designates the country of manufacture The last five digits of the serial number are assigned sequentially and are unique to each instrument Those manufactured in the United States have six unique digits The country of manufacture is identified as follows B000000 Tektronix Inc Beaverton Oregon USA 100000 Tektronix Guernsey Ltd Channel Isiands 200000 Tektronix United Kingdom Ltd London 300000 Sony Tektronix Japan 700000 Tektronix Holland NV Heerenveen The Netherlands AM 502 FINE S COARSE TEKTRONICO AM 502 DIFFERENTIAL AMPL ones j A m AM 502 Differential Amplifier plug in module REV C SEP 1980 1495 ma INTRODUCTION Description The AM 502 is a dc coupled differential amplifier with excellent common mode rejection capabilities and high gain for low voltage measurements The dc offset capabili ty permits nulling up to 1 volt dc so that low level low frequency signals i
5. terminai REV C SEP 1980 DC Offset Coarse and Fine Use these controls to offset up to 1 volt de potential difference at the input connectors The amplifier internal bias is changed to accomplish the offset The differential rejection capabilities ofthe AM 502 are not affected The LF 3dB switch must be in the DC OFFSET position to activate these controis HF and LF Bandwidth Reduction Use the HF 3dB switch to reduce the upper bandwidth limit as necessary to improve the signal to noise ratio when using the AM 502 in low frequency applications The LF 3dB control increases the lower bandwidth frequency Use this control to reduce dc drift when raising the lower bandwidth does not undesirably reduce the bandwidth for the signal being measured Pre Charging Use of this feature prevents surge currents due to charging the ac coupling capacitor in the AM 502 from damaging the circuit under test Before connecting the AM 502 to a signal containing a dc component push the AC and GND pushbuttons Connect the inputto the circuit under test Wait about one second for the coupling capacitor to charge Release the GND pushbutton and the coupling capacitor is charged to the value of the dc voltage to be measured Differential Operation A differential measurement is made by connecting each of the two inputs to selected points in the test circuit The input to the amplifier will then be the difference in voltage of the two sel
6. to 1 ms div c Set the function generator controls for a 50 mV 1 kHz sine wave output signal Use appropriate attenuation to eliminate input overdrive condition d Connect a 50 ohm cable from the function generator to the AM 502 input connector Adjust the vertical deflection amplitude for a five division display e Set the function generator output frequency to 1 MHz f Check the amplitude of the crt display for 3 15 to 3 85 divisions NOTE The specification in part f of this step must be met before proceeding with part g of this step g Check the remaining settings of the HF 3 dB switch using Table 2 6 as reference Change time base sweep rate as needed for lower frequencies Table 2 6 HF 3 dB BANDWIDTH ACCURACY AM 502 Function Vertical HF 3 dB Generator Deflection Switch Setting Output Frequency in Divisions 300 kHz 3 15 3 85 3 MHz 1 MHz 3 15 3 85 30 kHz 3 15 3 85 10 kHz 3 15 3 85 3 kHz 3 15 3 85 1 kHz 3 15 3 85 3 kHz 3 15 385 1 kHz 3 15 3 85 i Set the HF 3 dB switch to 1 MHz REV B SEP 1980 Specification and Pertormance Check AM 502 6 Check LF 3 dB Bandwidth Accuracy is 1 dB 2 dB a Check the settings of the LF 3 dB switch using Table 2 7 as reference Adjust the time base sweep rate to obtain an appropriate display Table 2 7 LF 3 dB BANDWIDTH ACCURACY AM 502 Function Vertical LF 3dB Generator Detlection
7. B point of the amplifier LF 3 dB Switch Selects lower 3 dB polnt of the amplifier and activates DC OFFSET controls OUTPUT Connector BNC output terminal con nector AC Pushbutton Selects the input signal ac or dc into the positive side of the preamplifier English 1 3 Operating Instructions AM 502 Waveforms applied to the and input connectors PIE FEZESER MAA AA a PONSA AA NUT ee ae 0 Signal square wave with an inter fering line freguency component is applied to the input The interfering signal sine wave is also applied to the input connector The resultant display Fig 1 3 Waveforms showing differential rejection of a common mode signal Resultant waveforms show the difference between the two signals Output Connections Make output connections using a bnc to dual binding post connector or a coaxial cable with at least one bne connector To prevent current limiting in the output stage do not load the output with less than 250 ohms Output current is limited to 20 milliamperes English 1 4 Step Gain DC Balance if this control is misadjusted the de output level will shift as the GAIN switch position is changed Push both GND buttons and place the GAIN switch in the 100 z position Rotate the GAIN switch from stop to stop while adjusting the STEP GAIN DC BAL control for no de shift at the QUTPUT
8. Tektronix Inc P O Box 500 Beaverton Oregon 070 1582 01 Product Group 75 97077 Tektronix COMMITTED TO EXCELLENCE PLEASE CHECK FOR CHANGE INFORMATION AT THE REAR OF THIS MANUAL AM 502 DIFFERENTIAL AMPLIFIER Francais Deutsch zE HE INSTRUCTION MANUAL Serial Number First Printing MAY 1983 Revised OCT 1986 Copyright 1973 1978 Tektronix inc All rights reserved Contents of this publication may not be reproduced in any form without the written permission of Tektronix Inc Products of Tektronix inc and its subsidiaries are covered by U S and foreign patents and or pending patents TEKTRONIX TEK SCOPE MOBILE and are reg istered trademarks of Tektronix Inc Printed in U S A Specification and price change privileges are reserved Copyright 1973 1978 durch Tektronix inc Alle Rechte vorbe halten Der Inhalt dieser Publikation darf ohne Genehmigung von Tektronix Inc nicht weitergegeben werden Produkte von Tektronix Inc und seinen Tochtergeselischaften sind durch US und Ausiandspatente und oder schwebende Patente abgedeckt TEKTRONIX TEK SCOPE MOBILE und sind gesch tzte Warenzeichen von Tektronix Inc Gedruckt in U S A Spezifikations und Preis nderungen bieiben vorbehalten Copyright 1973 1978 TEKTRONIX INC Tous droits r serv s Le contenu de ce manuel ne peut tre reproduit sous queique for me que ce soit sans l accord de Tektronix Inc Tous tes produits TEKTRONIX
9. cedure Most of these are available from Tektronix Inc and can be ordered through your local Tektronix Field Office or representative Table 2 4 LIST OF TEST EQUIPMENT REQUIREMENTS Performance __ Description Requirements Applications Oscilloscope Bandwidth dc to 2 MHz Used throughout pro Minimum deflection cedure to provide Example TEKTRONIX 5110 5A13N 5B10N factor 20 mV div sweep rate 2 ms div to 1 us div accuracy within 3 Power Moduie Calibration Gen erator Amplitude calibration 5 mV to 10 V accuracy 0 25 into 1 MQ out put square wave at approximately 1 kHz Waveforms sine and square voltage ampi itude 10 V p p freq uency range 1 kHz to 50 kHz accuracy with in 3 Impedance 50 O accur acy within 2 conn ectors bnc Function Generator Termination Attenuator 10X 4 required Impedance 50 N accura cy within 2 conn ectors bnc Coaxial cable 2 required impedance 50 2 length 36 inches connectors bnc F Requires TM 500 Series power module 2 4 Three compartments or Ail tests more i l Amplifier gain check Signal generation for cross neutral ization and high frequency cmrr check Qutput termination for signal gen erator Output attenuation for signal gen erator Noise check Provides signal interconnection display TEKTRONIX TM 503 or TM 504 TEKTRONIX PG 506 Calibration Generat
10. connector b Set the AM 502 100 pushbutton out the input and input AC and GND pushbuttons out and the GAIN switch to 700 c Setthe AM 502 HF 3 dB switch to 3 MHz and the LF 3 dB switch to DC d Set the vertical amplifier deflection factor for 10 mV div e Connect a 50 ohm cable from the function generator to the center connector of the dual input connector Set the function generator for a 10 V 50 kHz sine wave output signal with DC offset set to 0 at lt 1 V Bvg P P IS VENE f Adjust vertical amplifier position to center display on screen g Check the cri display for one division of vertical deflection or less 4 Check 106 Common Mode Rejection Rejection Ratio is 50 dB dc to 50 kHz a Disconnect the 50 ohm cable from the function generator and connect it to the calibration generator output Press in the 100 pushbutton b Set the vertical amplifier deflection factor for 100 mV div c Set the calibration generator for a 100 volt square wave output signal d Check crt display for 3 1 divisions or less of vertical deflection e Disconnect the dual input connector and 50 ohm cable from the AM 502 input connectors REV B SEP 1980 5 Check HF 3 dB Bandwidth Accuracy is 1 dB 2 dB a Set the AM 502 HF 3 dB switch to 1 MHz the input pushbutton to GND and 100 pushbutton out b Set the vertical amplifier deflection factor to 1 V div and the time base sweep rate
11. ct a 50 ohm cable from the calibration generator fast rise output connector to the end of the attenuator string Set the pulse duration contro tor 1 ms e Adjust the AM 502 DC OFFSET controls FINE and COARSE until the OVER RANGE indicator light goes out f Adjust the calibration generator pulse amplitude control and observe two noise bands as shown in Fig 2 1A remove one attenuator if necessary to produce the desired display g Decrease the calibration generator pulse amplitude until the noise bands just merge See Fig 2 1B h Remove three of the attenuators and connect the signal through the 50 ohm attenuator including the 50 ohm termination to the vertical amplifier input and measure the pulse amplitude Calculate the tangentially measured display noise as follows Noise in pV Signal level measured in part h Attenuation Removed Typical figures are um 12 x 10 12 pV of noise 2 8 MN A Fig 2 1 Typical display of A two noise bands and B noise bande marged i Disconnect all cables and eguipment This completes the Performance Check of the AM 502 Differentiat Amplifier REV A AUG 1979
12. e 2 5 AMPLIFIER GAIN ACCURACY Calibration AM 502 AM 502 Generator Vertical GAIN HF 3 dB Amplitude Deflection Setting Switch Setting Setting in Divisions FIG A A A E A E 100 1MHz 1V 49 51 _ 200 1 MHz 5 V 4 9 5 1 500 2v 4 9 5 1 1K MHz 1V 49 51 2K 50 mV 4 9 5 1 5K 0 1MHz 20 mV 4 9 5 1 10K 10 mV 4 9 5 1 20K 5 mV 4 9 5 1 50K 2 mV 49 51 100K 1 mV 4 9 5 1 2 Check 100 Amplifier Gain Accuracy Gain Accuracy is within 2 a Disconnect all cables and repeat Step 1 partsa b c and d b Set the AM 502 GAIN switch to 10K and the HF 3 dB switch to 1 MHz push in the 100 pushbutton c Set the calibration generator amplitude control to 1 V Adjust the AM 502 DC OFFSET control FINE and COARSE until the OVERRANGE indicator light goes out d Position the crt display to the center of the graticule with the vertical amplifier position control e Check the crt display amplitude for 4 9 to 5 1 divisions 2 6 f Disconnect the 50 ohm terminator from the AM 502 input connector andconnectittothe input connector Push in the input GND pushbutton and push and release the input GND pushbutton g Check repeat parts d e and f of this step h Disconnect the 50 ohm termination 10X attenuator and cable 3 Check Common Mode Rejection Rejection Ratio is 100 dB dc to 50 kHz a Connect a dual input connector cabie between the AM 502 input and input
13. ected points Consideration should be given to the proper connection method used between the AM 502 and the circuit under test otherwise improper measurement results may occur See Fig 1 4 tor reference Differential voltage measurements are made by apply ing the signals to the input and input connectors Set the input coupling switches to the same position AC or DC depending on the measurement being made In differential measurements only the voltage difference between the two signals is amplified Common mode signals common in amplitude phase and frequency are rejected See Fig 1 3 A B and C for reference Single ended measurements often yield unsatisfactory results because of the interference resulting from ground loop currents between the AM 502 and the device under test In other cases it may be desirable to eliminate a dc voltage by means other than the use of a blocking REV C SEP 1980 Operating Instructions AM 502 A Right Differential Amplifier under test common ground 8 Wrong probe shieids should not be Differential Ampiitier floating 4 4 i i i eircuit under test Differential Ampiifier probe shieids should not be grounded to equipment under test circuit under test 0931 1582 13 Fig 1 4 Connecting a differential amplitier to a signal source capacitor which could limit the low frequency response The limitations of sing
14. eter rei AN H Width 2 5 inches 6 35 centimeter Length 11 8 inches 30 0 centimeter Net Weight Instrument Only 1 8 lbs 82 kilograms REV C SEP 1980 2 3 Specification and Performance Check AM 502 PERFORMANCE CHECK introduction This procedure checks the electrical characteristics of the AM 502 that appear in the Specification section of this manual If the instrument fails to meet the requirements given in this performance check the calibration procedure should be performed This procedure can also be used by an incoming inspection facility to determine acceptability of performance The electrical characteristics in Section 2 are valid only if the AM 502 is calibrated at an ambient temperature of 20 C to 30 C and operated at an ambient temperature of 0 C to 50 C Forced air circulation is required for ambient temperature above 40 C Tolerances that are specified in this performance check procedure apply to the instrument under test and do not include test equipment error Test Equipment Required The following test equipment or equivalent is required to perform the performance check Test equipment characteristics listed are the minimum required to verify the performance of the equipment under test Substitute equipment must meet or exceed the stated requirements All test equipment is assumed to be operating within tolerances Special test devices are used where necessary to facilitate the pro
15. gnal is obtained if the input circuit of the AM 502 is overdriven large amounts of current will flow opening the protective fuses REV C SEP 1980 STEP GAIN DC BAL Control Adjusts de balance in the preamplifier stage Variable Gain Control con tinuously variable Calibrated in the cw position GAIN Switch Selects amplifier gain OVER RANGE Indicator When lit indicates mostover range conditions AC Pushbutton Selects the input signal ac or dc into the negative side of the preamplifier _ Input Connector l BNC connector for the positive side of the amplifier GND Pushbutton Grounds amplifier input Ground Binding Post Provides a chassis return tor signals input Connector BNC connector for the negative side of the amplifier Release Latch 100 Pushbutton Divides GAIN switch setting by 100 STEP GAIN DC BAL ti B RONIK DC OFFSET 2 IV FINE S COARSE AM 5023 DIFFERENTIAL AMPL re E A Ea GND Pushbutton Puil to remove plug in REV C SEP 1980 Ground amplitier input Fig 1 2 AM 502 controls and connectors Operating Instructions AM 502 DC OFFSET COURSE and FINE Controis Provides internal offset of approximately 1 V to input signal LF 3 dB switch must be in the DC OFFSET position for controis to operate POWER Indicator When lit indicates power is applied HF 3dB Switch Selects upper 3d
16. in a multi plug in power module especiaily at low output voltages or when operating close to other heat producing equipment internal temperature may exceed safe limits and actuate a thermal cutout in the power module Refer to the power module instruction manual for more complete information English 1 1 Operating Instructions AM 502 POWER MODULE Barrier Top Groove Bottom Groove a 1412 1582 2 Fig 1 1 Plug in installation and removal input Connections Unshielded test leads can be used to connect the AM 502 to a signal source when a high levei low frequency signal is monitored at a low impedance point However when any of these factors is missing it becomes in creasingly important to use shieided signal cables in all cases the signal transporting leads should be kept as short as practical When making single ended input measurements conventional amplifier operation be sure to establish a common ground connection between the device under test and the AM 502 The shield of a coaxial cable is normally used for this purpose See Fig 1 3 for reference Push the GND button for the input not connected to the device under test In some cases differential measurements require no common chassis ground connection and therefore are less susceptibie to interference by ground loop currents Consider the change in the source operating characteristics due to loading by the signal input cables The circu
17. it at the input connectors can be represented by approximately 1 megohm to ground paralleied by ap proximately 47 picofarads Two feet of 50 ohm coaxial cable increases the parallel capacitance by about 60 picofarads which could be excessive in many situations To minimize these effects use a higher impedance cable or an attenuator probe English 1 2 Probes Attenuator probes decrease the resistive capacitive loading of a signal source They also extend the measure ment range of the AM 502 to substantially higher voltages Some measurements require a higher resistance input to the AM 502 with very little source loading or signal attenuation in such situations use a FET probe or the high impedance input provision of the AM 502 Contact your Tektronix Representative for further information on probes High Impedance Input To raise the internat input impedance of the AM 502 to about 200 megohms remove the P40 plug Fig 3 1 Make certain the attenuator is inthe NORM mode Signal source impedance now becomes an important factor For exam ple a 100 picoampere gate current through 10 megohms produces a one millivolt offset This offset may result in significant error when small voltages are measured input Overloading When measuring unknown dc voltages push the 100 pushbutton in and start with the 100 position on the GAIN switch Increase the GAIN switch setting and finally release the 100 pushbutton until a suitable output si
18. le ended measurements are effec tively eliminated by using differential measurements English 1 5 Performance Conditions The eiectrical characteristics are valid only if the AM 502 has been calibrated at an ambient temperature between 20 C and 30 C and is operating atan ambient temperature between 0 C and 50 C unless otherwise noted Gain Norma Mode ame 100 Mode Variable Range Frequency Response Direct Coupled AG Coupled Bandwidth HF 3dB Accuracy LF 3dB Accuracy REV B MAR 1978 Characteristics Section 2 AM 502 SPECIFICATION AND PERFORMANCE CHECK SPECIFICATION Items listed in the Performance Requirements column of the Electrical Characteristics are verified by completing the Performance Check in this manual Items listed in the Supplemental Information column are not verified in this manual they are either explanatory notes or performance characteristics for which no limits are specified Table 2 1 ELECTRICAL CHARACTERISTICS Performance Requirements 100 to 100 000 within 2 10 steps in 1 2 5 sequence 1 to 1000 within 2 Supplemental information A A de to 1 MHz 2 Hz or less at lower frequency 3dB point to 1 MHz 100 Hz to 1 MHz 9 steps in 1 3 sequence 1dB 2dB 0 1 Hz to 10 kHz 6 steps in 1 10 sequence 1dB 2dB Continuously variable uncal ibrated gain
19. mpressed on a dc level can be amplified without the degradation often introduced by ac input coupling High and low frequency 3 dB points can be selected atthe front panel to suit the application Signal inputs and outputs are available at the rear connector as well as at the front panel A front panel lamp indicates most overrange conditions of excessive input signal excessive gain or excessive offset The input circuit can be represented by approximately 1 megohm to ground paralleled by approximately 47 picofarads The input impedance can be raised to about 200 megohms with the removal of a jumper Overload protection is provided by fuses in series with the input which open when large amounts of current flow due to overloading conditions A STEP GAIN DC BALANCE control is provided to adjust for zero shift as the gain switch is changed from one position to another The DC OFFSET COARSE and FINE controls give offset up to 1 volt de potential difference at the input connectors The amplifier internal bias is changed to accomplish the offset The LF 3 dB switch must be in the DC OFFSET position to actuate these controls The HF 3 dB switch is used to reduce the upper bandwidth limit as necessary to improve the signal to noise ratio when using the AM 502 in low frequency applications The LF 3 dB control increases the lower bandwidth frequency Use of the pre charging feature prevents surge currents due to charging the ac
20. or TEKTRONIX FG 501 Function Generator Tektronix Part No 011 0049 01 Tektronix Part No 011 0059 02 Tektronix Part No 012 0057 01 REV 8 MAR 1978 Preliminary Procedure 1 Ensure that all testequipmentand the AM 502 under test are suitably adapted to the line voltage to be applied Refer to the installation section of the power module manual 2 Ensure that all test equipment is suitably adapted to the applied ine voltage 3 install the AM 502 into the power module and if applicabie install the TM 500 series test equipment into the test equipment power moduie 4 Connect the equipment under test and the test equipment to a suitable line voltage source Turn all equipment on and allow at least 20 minutes for the equipment to stabilize Initial Control Settings Set the following controls during warm up time AM 502 STEP GAIN DC BAL midrange 100 pushbutton out DC OFFSET FINE and COARSE midrange GAIN 100 CAL fully clockwise ca HF 3dB 1 MHz LF 3dB DC OFFSET AC pushbutton out GND pushbutton out AG pushbutton out GND pushbutton in Oscilloscope Set for well defined trace and norma brightness Intensity Focus Vertical Amplifier Volts Div 1 V Input dc Variable fully clockwise cal REV A AUG 1979 Specification and Performance Check AM 502 Time Base Plug in Time Div 5 ms Variable cal in Triggering Slope selected Mode p p auto Coupling ac Source in
21. ternal Position Set so trace starts at left side of graticule Display Mode main sweep Magnifier Xi Calibration Generator Amplitude iv PERFORMANCE CHECK PROCEDURE NOTE The oscilloscope vertical amplifier system gain the 50 ohm termination and 50 ohm attenuator are required to be calibrated within 0 5 ac curacy prior to proceeding with Steps 1 and 2 The PG 506 calibration generator may be used to set the system to 0 5 accuracy i Check Amplifier Gain Gain Accuracy is within 2 a Connect the calibration generator to the AM 502 input connector through a 50 ohm cable a 50 ohm 10X attenuator and 50 ohm terminator b Connect a 50 ohm cable from the AM 502 OUTPUT connector to the vertical amplifier input connector c Adjust the AM 502 DC OFFSET controls FINE and COARSE until the OVERRANGE indicator light goes out Position the crt display to the center of the graticule with the vertical amplifier position control d Check using the AM 502 GAIN and calibration generator amplitude settings given in Table 2 5 check the vertical defiection within the given limits Specification and Performance Check AM 502 NOTE The OVER RANGE indicator light must remain off during all switch settings Adjust the DC OFFSET controls as required during the check procedure NOTE install both plug in side covers and insert plug in into power module for checking gain below 5K setting to minimize noise on the display Tabl
22. to at least 2 5 times the calibrated gain setting With Gain control set to 20K or less selectable HF 3dB points are within 1dB 2dB Upper 3dB point reduces to 500 KHz at 50K gain and 250 KHz at 100K gain Reference approximately 5 0 V peak to peak output at 1 KHz Reading range 2dB to 5dB Reading range 2dB to 5dB Specification and Performance Check AM 502 Table 2 1 Con t Characteristics Performance Requirements Supplementai Information Output Voltage Swing ES V Current 20 mA Ro 5 0 or Jess Minimum Load 2500 Impedance Common Mode Norma Mode Range 5 V 100 dB dc to 50 kHz Direct coupled with inputs shorted together Rejection Range 100 Mode Range 50 V Direct coupied with less than 100 V peak peak sine wave input e Rejection Range 50 dB de to 50 kHz DC Offset Range At least and iV Maximum Safe input Voltage Direct Coupled Norma Mode 15 V dc plus peak ac to 5 MHz or less 100 Mode 350 V dc plus peak ac to 5 MHz or less AC Coupied 356 V dc plus peak ac with coupling capacitor precharged Maximum input Gate Current each input 50 pA at 25 C Noise Referred to Input NORM mode lt 25 uV tangentially 10 Hz to 1 MHz selected measured with 25 0 bandwidth Typically or less source resistance lt 6 0 nV Hz above 1 kHz Typically lt 2 0 uV Hz from 1 kHz to 9 kHz
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