Tektronix 5A14N User's Manual
Contents
1. RENT eden ge 8 ELSE RENEE RR EATER IRE ae Sacha aE ae oe BEE A SED SATS LYDD Se TAIANA RO TNA AMO SSSA A SERRE MANES a o Ex tree AED A signees REES Ta eS TS eee OND eee Sah Sie Naa e AS BR I EIERN o at otek NOA SEITEN une nn AAN A ae o ERA pe 8 25 fr s e On CAI NO Ach tee SON A 5 anor Presenter secs i Set a ee Ua Vee LD BF ASS e i FOmMIXx eaver on RRA ORAS Ee tek EN yl SONATE EN ar a ee a te K A eaa M it Te Pire ee ie Sa em are O pa eas nee Sa ada RN N x y z EISEN E a A Sates e ne near Malas era ee Den Bae tenis Pas ted States of America All rights r eg Uni Er s SE OYE uae eee uo eseat t p SR er Lay as F 3 lt y dere fo ae Ber AS O A tents of th y rodu NEISSE EEE AN OS ESSN ea att y Ai OS fan OS ONO ARBINS EAS OI A A ARNAN PRODU 0 X Sas Sse EREE EA ae z Sine EL SER EN Be es A Heke G oun r EREE PDE ite i a RN ea een anni ihren yeh Nain ans ey Se EN Een BENDER EEE Eee TD UTE RESET SUN Re N EL BERNER NND T2. E i H ver a y eo es een fe 1 H ia i H i i Instrument Description The 5A14N Four Channel Amplifier is a general purpose plug in unit for use with Tektronix 5100 series oscillo scopes The unit contains independent amplifier channeis with identical characteristics and features solid state circuitry and simplicity of operation The VOLTS DIV knob skirts are lighted to provide a direct readout of calibrated defiection factor either with or without a probe Any channel may be used to produce a single channel display All channels may be displayed alternately or channel 4 and 3 may be alternated with 2 and 1 to produce four displayed channels While designed primarily for use as a vertical amplifier the unit can be operated in conjunction with the horizontal deflection system of the oscilloscope for X Y displays CONTROLS AND CONNECTORS This is a brief description of the function or operation of the controls and connectors Additional operating informa tion is given under Genera Information DISPLAY Applies logic levels to the oscillo scope system to enable plug in operation The switch functions only when the plug in is operated in one of the vertical plug in compart ments POSITION Positions display Volts per major graticule division Selects calibrated deflection factors from 1
3. LEINE AA NV TONTA GG CRES O AR SEIN ee E EEE NS St Meat en ESN lion recht ee mesa eae YANASA TEESE INT OS TRATES ER AS ASE NEES ROE ANS N AHO EIERN ERS RS Hoes flan TERESA AS PM ANS IYASAN RENNER atten ce eae Eon sist ROEM ANANAS ASAN eT eRe SN aS OARS EENETI AANO NRR ENDEN AA ANIN OSAAN DAVAR RATEN AN E TIRO IATA tt LIFES RARO CN ARAS YAR NMEA ranted or TIO ER SED FAS AIRES A O O A RATAS PITA NE AO IR a NT RR SINE WE OOO SD Ao NAPUS EAT ARS TOT SAA BY NSE ASIN NED SRST OO SNA A MARRON A ICAA PIN O RTM ON TENANTAN IITA AIWA SOS PAR rE CTO AA RRA EN AN ir ATAN SR EN A EN IEA REIR PAIDOS ATAN EAA EDEN EAPO DEREN EN R S e RE ES SAA STAR BEREITETE FT Zn ARTO NE IN DI SSR Ea DEREN Moe SEES A BESSER ONE TE SERS SAR SAAS SEAS Eee SS GR TAON YANIR AR SUSAR UNEASE Mi DRAINS ARNE ER ee EAN SY 7 a AAA ENVIARAN AROSA AR TIAS ATE Sig thas Oa Es AAA O AN 4 AAC A NAS LA ARPA ERAN AS En CRI TO IN EASA Ns seas MRE wee SOND NNS
4. to 5V Div 12 steps in a 1 2 5 sequence Knob skirt is iHuminated to indicate deflection factor Readout is auto matically scaled when readout coded 10X probe is installed VOLTS DIV Variable CAL Provides uncalibrated continuously Volts Div variable deflection factors between calibrated steps extends range to 12 5 V Div SECTION 1 OPERATING INSTRUCTIONS SATIN AC DC Button pushed in selects capacitive coupling of input signal button out selects direct coupling of input signal input Coupling Pushbuttons GND Disconnects the input signal and provides ground reference to the amplifier input stage PRE CHG Both AC and GND buttons pushed in allows pre charging of the coupling capaci tor Release GND for measure ment Slide switch at the rear of the plug in that selects the channel logic sequence When the switch is in the forward position toward the front panel the plug in 15 in the single beam mode which provides a 4 3 4 3 2 1 2 1 logic sequence In the opposite position the plug in is in the dual beam mode which pro vides a 4 3 2 1 logic sequence Single or Dual Beam Selector Internal BNC connectors for application of external voltage signals Includes a coded probe input ring for activa tion of X10 readout Input Connectors BASIC OPERATION Preparation The 5A14N is calibrated and ready for use when received lt can be installed in any compartment
5. Serial Number ee gs Tektronix Inc P O Box 500 6 Beaverton Oregon 97005 gt Phone 644 0161 Cables Tektronix 070 1229 00 1071 pene teste gun A so mmn y remm he 8 SS RER SO A ATRAS er EBENE 2 S ANAND SENOS ESTO e ARAS AS IE DR di ys 2 2 Pe auth ER Bi DR SENSE EISEN e de A nen RETA PEA v A al a nene a NANA EE NARA SEE BER HR REES SES SMES thee Lee eee B a LER A ote IHRE RER a oe RR E Ti de H EE NS z H E TN ERA YEAS pita a Mee 2 E N Fae ta eRe EIS FREE stas Ne onto Y SASS NER a Ne i Se ARN ES ra E TAS VENEN NAVASA T SENSE RU A r ERRORS FRESSEN AT SEN ES KERNE TS ANA Set at An 7 5 a ANAN ines y T FESTE ay i FREE a o Saat Service Please include the instrument Type Number or aN pene GERNE se San gt a e in wi ae 96 PR ET kA y E a BRITEN Thu
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7. 3 dB point Therefore some low frequency attenuation can be expected near this frequency limit Distortion will also appear in square waves which have low frequency components The GND pushbutton provides a ground reference at the amplifier input The signal applied to the input connector 15 presented with a one megohm 1084 while the amplifier input is grounded This eliminates the need to externally ground the input to establish a DC ground reference Pre charging To minimize surge currents in the circuit under test when using deflection factors of 50 mV Div through 1mV Div and a test lead or 1X probe use the AC DC and GND pushbuttons to take advantage of the pre charging circuit incorporated in the unit The pre charging circuit permits charging the coupling capacitor to the DC source voltage when the AC and GND buttons are pressed in and also limits surge current to the coupling capacitor from the signal source The procedure for using this circuit is as follows a Before connecting the 5AT4N to a signal containing a DC component push in the AC and GND buttons Then connect the input to the circuit under test b Wait about one second for the coupling capacitor to charge Remove the ground from the coupling capacitor GND button out The display will remain on screen and the AC component can be measured in the usual manner Deflection Factor The amount of trace deflection produced by a signal Is determined by th
8. differential DC imbalance in the amplifier as the VOLTS DIV switch is rotated throughout its range The shift is more noticeable on the most sensitive positions a With the instrument operating ground the input GND button pushed in and set the VOLTS DIV switch to 5V Move the trace to the graticule center with the POSITION control b Rotate the VOLTS DIV switch throughout its range and adjust the appropriate internal Step Atten Bal control for minimum trace shift Gain Check All Channels The vertical and horizontal deflection systems of the 5100 series oscilioscopes are gain standardized to permit a plug in to be moved from one oscilloscope to another or from one compartment to another within the oscilloscope without the need to recheck the calibration each time However the 5A74N gain can be checked and if necessary adjusted This completes the basic operating procedure for the SAVN Instrument operations not explained here or those that need further explanation are discussed under General Information GENERAL INFORMATION Applying Signals When measuring DC voltage use the largest deflection factor 5 V Div when first connecting the 5A14N to an unknown voltage source If the deflection is too small to make the measurement switch to a lower deflection factor In general probes offer the most convenient method of connecting a signal to the input of the 5A14N Tektronix probes are shielded to prevent pickup of elec
9. internal Single Beam Dual Beam selector In the forward or Single Beam position toward the front panel the channels are displayed in a 4 3 4 3 2 1 2 1 sequence In the rear or Dual Beam position the channels are dis played in a 4 3 2 1 4 3 2 1 sequence The Single Beam sequence is necessary in order to display all channels when operating with a single beam 5100 Series Oscilloscope where each vertical compartment is given two time slots in sequence before the other compartment receives its two time slots Since a possible four channels per compartment may be desired a double count of each 4 3 and 2 1 pair is necessary The Dual Beam sequence is useful when only one vertical compartment of a singie beam oscilloscope is being used or when a dual beam oscilloscope is being used in any YT mode input Coupling The AC DC pushbutton switch allows a choice of input coupling The type of display desired will determine the coupling used DC coupling button out can be used for most applications However if the DC component of the signal is much larger than the AC component AC coupling button in will probably provide a better display DC coupling should be used to display AC signais below about 2 hertz as they will be attenuated in the AC position A Operating Instructions 5A 14N In the AC position the DC component is blocked by a capacitor in the input circuit The low frequency response in the AC position is about 2 hertz
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12. e signal amplitude the attenuation factor if any of the probe the setting of the VOLTS DIV switch and the setting of the Variable control The deflection factors indicated by the VOLTS DIV switch are calibrated only when the CAL control is rotated fully clockwise into the detent position The range of the CAL control is at 16851 2 5 1 It provides uncalibrated deflection factors covering the full range between the fixed settings of the VOLTS DIV switch The control can be set to extend the deflection factor to at least 12 5 volts division rn B 3 ma Tan 1 Tn or Operating instructions 5A 14N Display Modes SINGLE TRACE To display a single channel apply the signal to the desired input and press the DISPLAY button to display the corresponding channel FOUR TRACE To display all four channels press ali the DISPLAY buttons Trigger Source The internal trigger signa for the time base plug in unit is obtained from the Channel 1 display only Select the trigger source by pushing the CH 1 DISPLAY button Oscilloscope Applications Refer to the Operating Instructions of the 5100 Oscilio scope System manual for basic oscilloscope applications including peak to peak AC voltage measurements instantaneous DC voltage measurements comparison measurements time duration measurements determining frequency risetime measurements X Y measurements etc ELECTRICAL CHARACTERISTICS Performance Conditions The follo
13. iy turned on when 0556 is biased off When one or two channels from each composite pair are ON U550 switches between the two pairs at either 1 2 or 1 4 the Alternate or Chop rate of the channel switching signal U550 divides the channel switching signal by 2 in the Dual Beam position or by 4 in the Single Beam position of Sb50 The divided channel switching signal from S550 determines the state of 0550 and 0556 when 1 or 2 channels from each composite pair are ON Probe Sensing Either of two lamps located behind the VOLTS DIV knob skirt illuminates the selected deflection factor to provide a direct readout Normally D5190 is fit connec tion of a readout coded 10X probe extinguishes DS 190 and hahts DS196 This changes the knob skirt readout by a factor of 10 to reflect the probe attenuation eliminating possible operator error
14. mined by the impedance ratio In addition to providing constant 100X attenuation the input attenuator maintains a constant input RC character istic one megohm paralleled by about 47 pF for 0 1 V to 5 V settings of the VOLTS DIV switch Amplifier The input amplifier consists of two identifical feedback amplifiers connected in a paraphase configuration Quiescently the two sides of the amplifier are balanced by the internal Step Atten Bal adjustment R115 so there is no current through the gain setting resistor R123 through R 128 See Fig 2 1 An input signal is developed across the 1 R123 thru R128 OUTPUT Fig 2 1 Input amptifier partial diagram showing quiescent current paths ER Pe Veen ii mel ON ar ern oS AR me Theory of Operation 5A 14N gain setting resistor shifting the current through 0134 and Q138 by the amount established through R123 R 128 and developing a push pull output signal across R 134 and R138 The gain of this amplifier ranges from about one to fifty and is primarily determined by the ratio of the gain setting resistor to the sum of R134 and R138 The push pull signal voltage from 0134 and 0138 collectors then passes through emitter followers 3142 and 0146 and is transformed to a signal current by 3160 and 3162 The Variable VOLTS DIV CAL potentiometer R168 and
15. nly Channel 1 except for the Channel Switching portion which necessarily involves all the channels Plug in Logic When the DISPLAY button 510 is pressed a logic level is applied to the electronic switching circuit in the oscilloscope to enable plug in operation this button has no effect when the plug in is inserted in a horizontal plug in compartment Power is applied to illuminate the front panel knob skirt readout lamps indicating the ON mode Input Coupling Signals applied to the front panel input connectors may be capacitive coupled AC direct coupled DC or internaliy disconnected GND Provision is made to pre charge or discharge the input capacitor to protect delicate circuitry under test When both the AC and GND buttons are pressed the input to the amplifier is grounded and the Input capacitor is pre charged through a one megohm resistor to the level of the applied input signal Input Attenuator The deflection factor of the plug in is set by a combination of gain switching in the amplifier and input attenuation The input attenuator is a frequency compensated voltage divider that provides 100X attenuation in the 0 1 V 5 V positions of the VOLTS DIV switch At DC and for low frequency signals the divider 5 essentially resistive attenuation ratio determined by the resistance ratio of R107 and R108 At higher frequencies the capacitive reactance becomes effective and the attenuation ratio Is deter
16. of the 5100 series oscilloscope but it is intended for use primarily in vertical compartments the center and left compart ments For X Y operation the 5A14N may also be installed in the horizontal right compartment refer to the 5100N Oscillscope System Instruction Manual for informa tion on X Y operation NOTE If the oscilloscope system receives no DISPLAY ON logic levels from the vertical plug ins it is designed to display the unit in the left compartment 1 1 ie a i 7 PAT a 3 mn E m4 zw m Operating Instructions 5A14N To instali align the upper and lower rails of the 5A14N with the plug in compartment tracks and fully insert it the plug in panel must be flush with the oscilloscope panel To remove pull the release latch to disengage the 5A14N from the oscilloscope The first few steps of the following procedure are intended to quickly obtain a trace on the screen and prepare the instrument for immediate use The remainder of the steps demonstrate some of the basic functions of the 5 14 Operation of other instruments in the system is described in the instruction manuals for those units 1 Insert the unit all the way into the oscilloscope system plug in compartment 2 Turn the oscilloscope Intensity control fully counter clockwise and turn the oscilloscope power on Preset the time base and triggering controls for a 2 millisecond division sweep rate and automatic t
17. riggering 3 Set the BATAN front panel controls as follows CH 1 through CH 4 DISPLAY ON deflection factor Huminated POSITION Midrange VOLTS DIV 2 V Calibrated Input Coupling DC GND A Adjust the Intensity control for normal viewing of the four traces 5 Position the traces two divisions apart with the POSITION controls 6 Apply a 400 millivolt peak to peak signal available at the oscilloscope Calibrator loop through a test lead or 1X probe to the CH 1 input connector 7 Release the CH 1 GND pushbutton The display should be square waves approximately two divisions in amplitude with the bottom of the display at the reference established in step 5 Adjust Trigger Level if necessary to obtain a stable display Rotate the CAL control throughout its range observing a reduction of the display amplitude Return the CAL control to the detent calibrated Volts Div position NOTE The preceding procedure applies for each channel However the internal trigger signal for the time base plug in is obtained from CH 7 only 1 2 8 To demonstrate AC coupled operation position with the POSITION control the bottom of the display to the graticule centerline 9 Push in the AC button and note that the display shifts downward to its average level Siep Attenuator Balance Each Channel if the internal control is not properly adjusted the CRT zero reference point trace or spot will shift vertically due to
18. the Gain setting potentiometer R166 reduce the gain in the 0160 0162 stage by developing an adjustable amount of signal voltage between their emitters 0150 3156 and 0158 in Channel 1 only receive the push pull signal and provide a singie ended trigger signal out 0177 and 0178 provide positioning current Channel Switching When only the CH 1 DISPLAY button 5510 is pressed 3510 15 biased off turning on Channel 1 switches 3180 and 0182 and allowing a signal to pass When oniy the CH 2 DISPLAY button S520 is pressed 3510 15 biased on switching 3516 off This action turns Channel 2 switches 0280 and 0282 on When both CH 1 and CH 2 buttons are pressed dual trace mode the state of 0510 and 0516 is deter 2 2 mined by the channel switching signal generated in the oscilloscope mainframe The form of this signal is selected on the sweep plug in by the Alternate Chop Mode button Channels 3 and 4 operate as a switched pair just as Channels 1 and 2 Thus the Channel 3 switches Q380 and 0382 are controlled by 0520 and the Channel 4 switches 0480 and 0482 are controlled by 0526 When both Channels 3 and 4 are ON they are either alternated or chopped as a pair through 0520 and 0526 by the channel switching signal Channels 1 and 2 are displayed as a composite pair when their composite switches 3530 and 3534 are turned on This occurs when 0550 5 biased off Channels 3 and 4 composite switches 3540 and 0544 are similar
19. trostatic interference A 10X attenuator probe offers a high input impedance and allows the circuit under test to perform very EA close to normal operating conditions The 5 14 is designed for compatibility with coded probes such as the Tektronix P6060 and P6052 Passive Probes The input connector has an outer ring to which the coding ring on the probe connector makes contact This type of probe allows the vertical deflection factor indicated by the readout to correspond with the actual defiection factor at the probe tip eliminating the need to consider the attenuation factor of the probe when measuring the signal amplitude on the graticule scale See your Tektronix Inc catalog for characteristics and compatibility of probes for use with this system Sometimes unshieided test leads can be used to connect the 5 14 to a signal source particularly when a high level low frequency signal is monitored at a low impedance point However when any of these factors is missing it becomes increasingly important to use shielded signal cables In all cases the signal transporting leads should be kept as short as practical Be sure to establish a common ground connection between the device under test and the 5 14 The shield of a coaxial cable or ground strap of a signal probe provides an adequate common ground connec tion Channel Sequence Logic The 5A14N has two channel sequence modes selected by the
20. wing characteristics apply when the BAAN is operating within the environment described in the 5100 series Oscilloscope System manual In addition the 5A14N must have been calibrated at an ambient tempera ture between 20 C and 30 C Display Modes Selectable by switch on rear panei All four channels displayed alternately ie 4 3 2 1 4 3 2 1 or channel 4 and 3 alternated with 2 and 1 Le 4 3 4 3 2 1 2 1 which provides a full display of left and right vertical channels when the BATAN is used in a 3 plug in single beam system Bandwidth 3 dB DC DIRECT COUPLED DC to at least 1 MHz AC CAPACITIVE COUPLED 2 Hz or less to at least 1 MHz Deflection Factor 1 to 5 V div within 2 in a 12 step 1 2 5 sequence Uncalibrated continuously variable between steps and to 12 5 V div Maximum Safe Input Voltage DC DIRECT COUPLED 350 V DC peak AC AC CAPACITIVE COUPLED 350 VDC Channel Isolation 0 1 division with an 8 division signal source or 5O db whichever is greater Input RC 1 MQ paralleled by 47 pF SAT4N SECTION 2 THEORY OF OPERATION introduction This section contains an electrical description of the circuits in the 5A14N Four Channel Amplifier unit A compiete block and schematic diagram is given on a pullout page at the back of the manual The four channels are nearly identical except tor Trigger Pickoff which occurs in Channel 1 only Thus this discussion concerns o
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