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Tektronix 305 DMM Instruction Manual Download Page 41

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Some signals may contain  undesirable frequency com­

ponents,  as shown  in  Figure  19.  Common  mode  rejection 

can eliminate or  reduce these components  from  the meas­

urement.  Use  the follow ing procedure to   reduce o r elim i­

nate  an  undesirable line  frequency  component:

1.  A pply  signal  to  C H I  INPUT connector.

2.  A pply  line frequency signal to  CH2  INPUT connector.

3.  Set  the Vertical  Mode to  ALTernate position.

4.  Pull  the PULL:  IN VERT  knob to   invert  the channel 

2 display.

5.  Adjust the  CH2 C AL  (Variable) control  so  that the 

amplitude o f the channel  2 signal compares or is equal  to 

the undesired  signal component  o f channel  1  display.

6.  Set  the Vertical  Mode  to  A DD  and readjust CH2 

Variable control  fo r  maximum  rejection o l  the undesired 

signal  component.

CH  1  tklUNAL 

WITH 

UNWANTED 

LINE 

FREQUENCY 

COMPONENT

CH 2 SIGNAL 

FROM  LINE 

FREQUENCY 

SOURCE 

(INVERTED!

A . 

CH  1  A ND   CH 2 SIGNALS

SIGNAL WITH 

LINE 

FREQUENCY 

COMPONENT 

CANCELED 

OUT

(2237-17)

2424-21

B. 

RESULTANT SIGNAL.

Figure  19.  Common mod* r*|*ction of an undesired line-frequency.

32

305 Operators

REV  A SEP  1979

Summary of Contents for 305 DMM

Page 1: ......

Page 2: ...Tfektronix 305 DMM OSCILLOSCOPE OPERATORS INSTRUCTION MANUAL ...

Page 3: ...Tektronix Inc P 0 Box 500 Beaverton Oregon 97077 070 2424 00 ...

Page 4: ...ktronix COMMITTED TO EXCELLENCE PLEASE CHECK FOR CHANGE INFORMATION AT THE REAR OF THIS MANUAL 305 DMM OSCILLOSCOPE OPERATORS INSTRUCTION M A N U A L First Printing JUL 1978 Serial Number Revised JUL 1981 ...

Page 5: ...sion 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 andf are registered trademarks of Tektronix Inc TELEQUIPMENT is a registered trademark of Tektronix U K Limited Printed in U S A Specification and price change privileges are reserved ...

Page 6: ...Comparison Measurements 25 CONTROLS AND CONNECTORS 6 Time Duration And Frequency Measurement 20 Power Source And Connectors 6 Time Difference Measurement Between Two Calibrator And Display Controls 8 Pulse Waveforms From Different Sources 27 Vertical Controls 8 Dual Trace Phase Difference Measurements 28 Horizontal Controls 11 High Resolution Phase Difference Measurement 30 Triggering And Sweep Co...

Page 7: ...ection system different sources 27 controls 10 Figure 16 Example of dual trace phase difference Figure 7 Location of horizontal deflection system measurement 28 controls 11 Figure 17 Example of high resolution phase difference Figure 8 Location of trigger and sweep controls 12 measurement 30 Figure 9 Location of digital multimeter controls 14 Figure 18 Example of rise time measurement 31 Figure 10...

Page 8: ...LIST OF TABLES Page TABLE 1 Battery charge related to operating tem perature and charging temperature 5 TABLE 2 Electrical Characteristics 33 305 Operators iii ...

Page 9: ...305 DMM Oscilloscope 305 Operators ...

Page 10: ...tive measurements Input con nectors for the multimeter are located on the right side of the instrument cabinet Oscilloscope functions provide dual channel dc to 5 megahertz vertical deflection with calibrated deflection factors o f 5 millivolts division to 10 volts division in a 1 2 5 sequence The horizontal deflection system provides cali brated sweep rates from 0 5 second to 1 microsecond per di...

Page 11: ...ction insert this plug into a socket outlet that has a securely grounded protective ground contact L o not defeat the grounding connection Any interrup tion o f the grounding connection can create an electric shock hazard Before making external connections to this instrument always ground the instrument first by connect ing the power cord to a proper mating power outlet that is known to be properl...

Page 12: ...HAT THE AC LINE VOLTAGE RANGE INDICATOR DISPLAYS THE NOMINAL AC LINE VOLTAGE AVAILABLE I115 OR 230 V AC SET THE POWER SOURCE SELECT SWITCH TO AC FULL OR TRICKLE CHG W A R N I N G I WHEN OPERATING FROM EXTERNAL DC OR INTERNAL BATTERIES THE INSTRUMENT GROUND CONNECTOR MUST BE CONNECTED TO A PROTECTIVE EARTH GROUND SET THE POWER SOURCE SELECT SWITCH TO ONE OF THE EXT DC POSITIONS APPLY EXTERNAL DC PO...

Page 13: ...ting time of the internal batteries depends upon display intensity state of battery charge discharge temperatures and the instrument function being used oscilloscope DMM or both When the instru ment is operated at 20 C to 303C C8 F to 86 F the typical operating time of fully charged batteries with both oscilloscope and DMM in operation is approximately 1 6 hours A light emitting diode LED labeled ...

Page 14: ...capacity of nickel cadmium cells varies with the temperature at which they are charged and operated Table 1 shows the percentage of full charge capacity at various charging and operating temperatures Battery charge related to operating temperature and charging temperature Charging Operating Temperature Temperature 1 5 C 20 to 25 C 55s C 0 C 40 60 50 20 to 25 C 65 100 85 40 C 40 65 55 BATTERY CARE ...

Page 15: ...hed by qualified service personnel only 1 Power Source Selector switch Three position switch provides operator selection of ac line voltage external dc voltage or battery operation The ac position in conjunc tion w ith the AC Input Voltage Selector switch allows the 305 to be operated over a range of ac line voltages Power Source Selector switch also provides operator selection of a Full or Trickl...

Page 16: ... of operation Figure 4 The maximum safe ac or dc voltage coupled to the CHI CH2 or EXT TRIG INPUT if applicable input connector should not exceed 250 V dc peak ac 7 CH2 Y INPUT BNCconnector to apply an external signal to the CH2 vertical system or Y axis vertical in the X Y operation mode Figure 4 8 EXT TRIG INPUT BNC connector to apply an ex ternal trigger input signal Figure 4 9 Ac Line Cord Con...

Page 17: ...r Y Controls the vertical position of the crt display for each channel In the X Y mode of operation the CHI X controls the position of the display horizontally and CH2 YJ controls the posi tion o f the display in the vertical direction 15 VOLTS DIV CHI and CH2 Selects vertical de flection factor of signals applied to the CHI and or CH2 INPUT connectors The CAL Variable control must be in the CALib...

Page 18: ...305 Operators 9 ...

Page 19: ...charging of the vertical input coupling capacitor by applying the input signal via a one megohm resistor DC A ll components of the input signal are directly coupled to the vertical attenuators 20 Display Mode Five position lever switch that selects the operation mode of the vertical deflection system signal displayed on the crt C H I Displays the signal applied to the CHI X INPUT connector CH2 Sel...

Page 20: ...ignals applied to the CHI X and CH2 V INPUT connectors CHI plus CH2 When the PULL INVERT control is pulled out the CH2 input signal is inverted providing a difference display o f signals applied to the CH 1 and CH2 INPUT connectors CHI minus CH2 HORIZONTAL SWEEP CONTROLS FIGURE 7 21 POSITION Controls horizontal positioning of the crt display except in the X Y mode of operation when the CHI X POSIT...

Page 21: ...0 1 micro second division 25 X Y Selects the X Y display operating mode when SEC DIV switch is rotated to the X Y position X axis signal is provided by the CHI X INPUT connector and Y axis signal input is through the CH2 Y INPUT connector Verti cal Display Mode switch must be in the CH2 position for X Y operation TRIGGERING CONTROLS FIGURE 8 26 Source Push button switches to select signal source a...

Page 22: ...ter Trigger Source Coupling and Slope have been selected 30 T T L ln conjunction with TTL positions of the CH1 CH2 VOLTS DIV switch presets the trigger for a stable display from an input TTL source Trigger Coupling must be in DC and Mode switch in the NORM position 31 Trigger Mode Push button switch that determines the operating mode of the trigger circuit AUTO Automatic in Sweep is triggered when...

Page 23: ...nnected to the DMM input jacks 34 Digital Readout Displays measurement selected by the FUNCTION control switch Negative polarity indicator is automatic No polarity indication for positive voltage measurements Decimal point locator is automatic The readout displays when voltage of the applied power source either external or internal batteries is insufficient Internal Battery Voltage Indicator When ...

Page 24: ...ics of an applied signal high quality low loss coaxial cable should be used Also the cable should be terminated at both ends in its characteristic impedance If this is not possible use suitable impedance matching devices Grounding The most reliable signal measurements are made when the 305 and the unit under test are connected together by a common reference ground lead in addition to the signal le...

Page 25: ...l and display several cycles of calibrator square wave at approximately A divisions in amplitude Adjust probe compensation through hole in the compensation box for the best front corner response to the signal as shown in Figure 10 RRECT CO Ft AT ER COM BATED rERSHOOT DER COM jCATcn OV PEt 0 UN N IRC oA1C U LLOFF 812424 2SA 223 Figure 10 Probe compensation w 16 305 Operators REV A MAR 1980 ...

Page 26: ...t TRIGGER LEVEL Midrange SCOPE POWER On in Intensity Demonstrate normal intensity operation as follows 1 Rotate the INTENSITY control between its max imum clockwise and counterclockwise positions The dis play should vary from full intensity to no display 2 Reset the INTENSITY control to a comfortable viewing level C A U T I O N To protect the crt phosphor do not leave the INTENSITY control set any...

Page 27: ... play begins at the left vertical graticule line 5 Rotate CHI POSITION control fully counterclock wise and fully clockwise settings The display should move o ff screen in both vertical directions Adjust for a normal centered display 6 Adjust the CHI POSITION for an equal deflection above and below the center horizontal graticule line The display should total approximately three vertical divisions ...

Page 28: ...THE VOLT DIV CONTROL SWITCH ASTIG ASTIGMATISM RECESSED SCREWDRIVER ADJUSTMENT USED IN CONJUNCTION WITH THE FOCUS ADJUSTMENT TO OBTAIN OPTIMUM DEFINITION OF THE CRT D FOCUS RECESSED SCREWDRIVER ADJUSTMENT FOR OPTIMUM CRT TRACE DEFINITION TRACE ROTATION RECESSED SCREWDRIVER ADJUSTMENT TO HORIZONTALLY ALIGN THE CRT DISPLAY TRACE 2424 06 Fioura 11 Location of external operator adjustments 305 Operator...

Page 29: ...display now starts with a negative pulse Push in and release the Slope switch The display should again be in the positive position 3 Rotate the SEC DIV switch ono or two positions on either side of the 5 ms position The display sweep rate should change accordingly Reset the SEC DIV to the 5 ms position 4 Rotate the SEC DIV CAL Variable control to its fully counterclockwise position The pulse width...

Page 30: ... 000 110 counts with no signal connect to the DMM INPUT and the two test probes touching each other 3 Connect the LO test probe to the reference test point usually circuit ground or to a test point and the HI test probe to the unknown ac voltage to be measured 4 The display represents the value of the ac voltage source 5 Disconnect DMM from the ac voltage source Resistance 1 Push the kQ FUNCTION p...

Page 31: ... procedures for making the basic voltage and resistance measurements with the digital multimeter are the same as those in the Adjustments and Basic Displays section and will not be duplicated here instantaneous Amplitude Measurement DC Figure 12 Measure the amplitude of any point on a waveform with respect to ground as follows 1 Set Vertical Coupling to DC 2 Apply the signal to be measured to eith...

Page 32: ... difference in divisions between re ference line and desired point on waveform and multiply by the VOLTS DIV setting CAL Variable must be in detent setting FORMULA VERTICAL DEFLECTION FROM REFERENCE x VOLTS DIV _ INSTANTANEOUS LINE TO MEASURED POINT SETTING AMPLITUDE EXAMPLE DIVISIONS 10 MILLIVOLTS DIVISION 50 MILLIVOLTS 2237 20 2424 14 Figure 12 Example of instantaneous voltage measurement with V...

Page 33: ... detent position FO RM ULA 4 Adjust vertical POSITION so that the lower portion of the waveform coincides with a horizontal graticule line and that display remains within the viewing area VERTICAL x DEFLECTION IN DIVISIONS VOLTS DIV _ SETTING AMPLITUDE 5 Horizontally position the display so that one of the peaks coincides with the center vertical graticule line EXAMPLE 3 X 5 1 5 VOLTS DIVISIONS VO...

Page 34: ... the VOLTS DIV Variable ad justed to provide a vertical deflection of 4 divisions 30 volts 1 5 4 x 5 4 To measure an unknown signal set the VOLTS DIV switch to provide sufficient vertical deflection for an accurate measurement DO NOT change or adjust the VOLTS DIV Variable knob Determine the vertical de flection in divisions and calculate the amplitude of the unknown signal using the following for...

Page 35: ...trol The frequency o f this signal can be calculated by taking the reciprocal of the measured time duration o f one event For example the time duration o f the waveform is 16 6 milliseconds Using the formula Frequency Time duration Substituting the values 60 Hertz 1 16 6 milliseconds FORMULA HORIZONTAL y SEC DIV DISTANCE A SETTING TIM E OURATION EXAMPLE DIVISIONS X MILLISECONDS 6 6 MILLISECONDS DI...

Page 36: ...ed detent position 3 Set Trigger Source to CHI 4 Connect known reference signal to the CHI INPUT connector and the comparison signal to CH2 INPUT connector 5 Set Vertical Mode to either CHOP or ALT mode and center each of the displays vertically 6 Measure the horizontal difference between the two signals 7 Multiply this distance by the SEC DIV switch setting If X10 MAG control is used divide the d...

Page 37: ...or the higher fre quency signals Position both display traces to the center horizontal graticule line 3 Set Trigger Source to CHI and Trigger Mode to AUTO 4 Adjust the TRIGGER LEVEL for a stable display 5 Connect the reference signal to CHI INPUT connect or and comparison signal to CH2 INPUT connector CHANNEL 1 CHANNEL 2 MEASURE TIME FROM A TO B HORIZONTAL DIFFERENCE FORMULA HORIZONTAL y DEGREES D...

Page 38: ...amount of phase difference 7 Adjust CHI and CH2 VOLTS DIV and associated CAL Variable controls for displays that are equal and about five divisions in amplitude 8 Set the SEC DIV switch for a sweep rate which dis plays about one cycle of reference waveform 9 Adjust the SEC DIV CAL Variable control for a one cycle reference signal CHI of exactly 8 divisions be tween the 2nd and 10th graticule lines...

Page 39: ...edures 2 Center measurement points on the vertical graticule line 3 Pull the X 10 MAG knob The sweep rate is now 4 5 division 45 division t 10 4 Adjust the horizontal POSITION control to move measurement points within the graticule area 5 Measure horizontal difference in divisions between corresponding points of the two waveforms 6 Multiply horizontal difference by the magnified sweep rate 4 5 div...

Page 40: ... Set the VOLTS DIV and Variable control for a 5divi sion display 2 Adjust vertical POSITION so that display bottom crosses midpoint of the second division 3 Measure horizontal distance in divisions between the 10 and 90 points on the waveform points A and B 4 To find the rise time multiple the horizontal distance in divisionsl by the SEC DIV setting Figure 18 Example of rise time measurement REV A...

Page 41: ...L INVERT knob to invert the channel 2 display 5 Adjust the CH2 CAL Variable control so that the amplitude of the channel 2 signal compares or is equal to the undesired signal component of channel 1 display 6 Set the Vertical Mode to ADD and readjust CH2 Variable control for maximum rejection ol the undesired signal component CH 1 tklUNAL WITH UNWANTED LINE FREQUENCY COMPONENT CH 2 SIGNAL FROM LINE...

Page 42: ...therwise stated TABLE 2 Electrical Characteristics Characteristic Performance Requirement Supplemental Information CALIBRATOR Output Voltage 20 C to 30 C 0 3 V within 1 15 C to 55 C 0 3 V within 2 Repetition Rate Approximately 1 kHz VERTICAL Deflection Factor Range 5 mV div to 10 V div 11 steps in 1 2 5 sequence REV A SEP 1979 305 Operators 33 ...

Page 43: ...ed settings Extends deflection factor to at least 25 volts div Frequency Response Upper Bandwidth Limit 5 mV div to 10 V div Dc to at least 5 MHz 3 dB point 4 division reference signal verti cally centered VOLTS DIV CAL Variable in detent Add Mode Dc to at least 4 5 MHz 3 dB point VOLTS DIV CAL Variable in detent Lower Bandwidth Limit Ac Coupled capacitive Approximately 10 Hz all deflection factor...

Page 44: ...ly 47 pF Maximum Input Voltage Dc Coupled 250 V dc peak ac Ac Coupled 250 V dc peak ac or 250 V p p ac at 1 kHz or less Chopped Mode Repetition Rate Approximately 50 kHz TRIGGERING Trigger Sensitivity Dc Coupled 0 3 division internal or 15 mV external from dc to 0 5 MHz increasing to 0 75 divisions internal or 50 mV external from 0 5 MHz to 5 MHz 305 Operators 35 ...

Page 45: ...rom 60 Hz to 0 5 MHz increasing to 0 75 division internal or 50 mV external from 0 5 MHz to 5 MHz Attenuates all signals below about 60 Hz Maximum Input Voltage 250 V dc peak ac at 1 kHz or less Display Time Jitter Due to Triggering 20 ns or less External Input Resistance Approximately 1 Mf2 Capacitance Approximately 47 pF 36 305 Operators REV A SEP 1979 ...

Page 46: ...ltage Int with 10X probe 1 4 V within 0 3 V Ext with 10X probe 1 4 V within 0 2 V Minimum Input Swing Int 0 5 div Ext 500 mV p p AUTO Operation Sensitivity Ac or Dc Coupling 500 Hz to 0 5 MHz Internal External 0 5 div 35 mV 0 5 MHz to 5 MHz 1 0 div 70 mV Low Frequency Response Down to 200 Hz or less 2 0 div 140 mV REV A SEP 1979 305 Operators 37 ...

Page 47: ...SEC DIV Variable in Cal detent posi tion Timing sot at 1 ms div or 1 is div Disregard first 0 5 js of sweep 0 C to 40 C Within 3 Over center 8 division display 15 C to 0 C Within 4 40 C to 55 C Within 4 Linearity Over any 2 division portion within center 8 divisions Disregard first 1 is of total sweep O C to 40 C Within 4 15 C to 0 C Within 5 40 C to 55 C Within 5 38 305 Operators REV A SEP 1979 ...

Page 48: ...ier X10 Calibrated Magnifier Accuracy Over center 8 division display Exclude the first 10 divisions and all the divi sions past 90th division 0 C to 40 C Within 5 15 C to 0 C Within 6 40 C to 55 C Within 6 Linearity Over any 2 division portion within center 8 divisions Exclude the first 10 divisions and all the divisions past 90th division 0 C to 40 C Within 6 15 C to 0 C Within 7 40 C to 55 C Wit...

Page 49: ...center 8 divisions of display Accuracy 0U C to 40 C Within 4 Variable Range Same as vertical X Axis Bandwidth Dc to 150 kHz 8 division reference signal Input R and C Resistance Same as vertical Capacitance Same as vertical Maximum Input Voltage Same as vertical DIGITAL MULTIMETER DC Voltmeter Range 2 V 20 V 200 V 1000 V Accuracy 15 C to 35 C Within 0 1 of reading 2 counts 40 305 Operators REV A SE...

Page 50: ...en maximum input signal voltage is within range X2 Step Response Time No more than 1 second plus the range step time no more than 1 second step Input Resistance 10 within 2 AC Voltmeter Range 2 V 20 V 200 V 700 V Accuracy 15 C to 35 0 Within 0 5 of reading 10 counts 40 Hz to 500 Hz Response Time No more than 5 seconds plus the range step time no more than 1 second step Input Impedance 10 MQ within...

Page 51: ...ange setting Response Time No more than 5 seconds plus the range step time no more than 1 second step Battery Check Function Internal batteries only Accuracy Within 5 of reading at 5 5 V to 8 V battery voltage Range Fixed 20 V range Maximum Safe Input Voltage at DMM INPUT Connector DCV FUNCTION Setting 1000 V dc peak ac between HI and LO inputs or between HI and chassis 42 305 Operators REV A SEP ...

Page 52: ...f sinusoidal 1000 V dc peak ac between HI and LO inputs or between HI and chassis 500 V dc component between HI and LO inputs k Q FUNCTION Setting 100 V dc peak ac between HI and LO inputs LO Floating Voltage 500 V dc peak ac between LO and chassis INTERNAL BATTERY SUPPLY Operating Time Oscilloscope only operating Calibrator waveform displayed 5 4H 305 Operators 43 ...

Page 53: ...TY maximum 8 div 5 MHz signal displayed 2 0H DMM only operating 10 0H Oscilloscope and DMM Calibrator waveform displayed 3 2H INTENSTIY maximum 8 div 5 MHz signal displayed 1 6H ENVIRONMENTAL Temperature Operating 15 C to 553C Oscilloscope 0 C to 55 C DMM Altitude Operating To 30 000 feet 44 305 Operators ...

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