Table of Contents
Troubleshooting
Related Manuals for Tektronix M 581 Series
Summary of Contents for Tektronix M 581 Series
- Page 1 I N S T R U C T IO N M A N L J / \ I _ t y p e PLUG-IN UNIT Tektronix, Inc. Cables: Tektroni S.W. M illikan W ay • P. O. Box 500 •...
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Page 2: Warranty
W A R R A N TY All Tektronix instruments are warranted against defective materials and workman ship for one year. Tektronix transformers, manufactured in our own plant, ore war ranted for the life of the instrument. Any questions with respect to the w ar... - Page 3 C O N T E N T S Warranty Characteristics Operating Instructions Circuit Description Maintenance Calibration Section 6 Ports List and Diagrams A list of abbreviations and symbols used in this manual will be found on page 6-1. Change information, if any, is located at the reor of the manual.
- Page 4 S lO N A l FOUR TRACI PRIAM P TYPE M PLUG-I N UNIT M O D I G A IN A D J DC § A l V O l f S / C M NO** I M I O rOimON AC ' V A f...
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Page 5: General Information
SECTION I CHARACTERISTICS General Information four channels are equal, accurate time comparisons can be made between signals. The Type M Plug-In Unit preamplifier contains four In the chopped mode of operation, channel switching identical channels that can be used separately or electron occurs at a rate of approximately 1 me divided by the ically switched to produce single- or multi-trace displays. - Page 6 Characteristics— Type M Operating Modes Input Characteristics (Approximate) 1 megohm ± 1 % paralleled by approximately 47 pf. Channels A, B, C, or D, separately. Chopped— Sequential electronic switching of channels at Maximum Allowable Combined DC and Peak approximately 1-mc rate. AC Input Alternate—Triggered electronic...
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Page 7: Front-Panel Controls And Connectors
FIRST TIME OPERATION Plug the M Unit into a Type 530-, 540-, 550-, or 580- Series* Tektronix oscilloscope, tighten the Securing Rod, ond turn the power on, Allow the instrument to reach operaring temperature, about 2 to 3 minutes, ond free-run the oscilloscope sweep ot 0.5 millisec/cm. -
Page 8: General Operation
CRT Cathode Selector switch (located at the particularly true for high-level, low-frequency signals. When rear of most Tektronix oscilloscopes) to the Dual-Trace such test leads are used, you must also use a ground con Chopped Blanking position.]... -
Page 9: Use Of Probes
Operating Instructions— Type M menf should work into a load impedance equal to that the CALIB. position. Serious errors in display measurements which it will see in actual use. may result if the setting of this control is unintentionally moved away from this position. 5. - Page 10 Operating Instructions— Type M ALTERNATE/CHOPPED Switch mode (if your oscilloscope has these positions). For lower frequency signals, use the AC or AC Slow triggering mode. In the AC Fast or AC LF Reject position, an rc filter is in single-trace operation ALTERNATE/CHOPPED serted into the trigger-input circuit of the oscilloscope which...
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Page 11: Basic Applications
The following paragraphs describe procedures for mak ing voltage, phase, and time-delay measurements with the Type M Plug-In Unit and associated Tektronix oscilloscope. An application is also included using the Channel A Signal Output Amplifier as a preamp for observing low-level signals. -
Page 12: Phase Measurements
Operating Instructions— Type M 1. Apply a reference signal of known amplitude to channel A and, with the corresponding VOLTS/CM switch and the VAR. GAIN control, adjust the amplitude of the dis play for an exact number of graticule divisions. Do not move the VAR. - Page 13 8 0 ° can be made using this method. Time-Delay Measurements The calibrated sweeps of Tektronix oscilloscopes cause any horizontal distance on the screen to represent a definite known interval of time. Using this feature in combination...
- Page 14 (also serves to trigger the divided by 10 or a maximum usable sensitivity of 2 milli- sweep), and a Tektronix P6006 Probe connected with the volts/cm can be obtained. cable end to the channel B, C, or D input connector and the tip to the "A ”...
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Page 15: Circuit Description
SECTION 3 CIRCUIT DESCRIPTION AMPLIFIERS input signal increases, however, the impedance of the capacitors decreases and their effect in the circuit becomes more pronounced. Introduction For high-frequency signals the impedance of the capaci tors is low, compared to the resistance of the circuit, and The M Unit consists of four identical input amplifiers, a the attenuators become capacitive voltage dividers. -
Page 16: Vertical Positioning
Circuit Description— Type M input signal at the base of Q5324 to a push-pull output millivolts at the transistor collectors. The voltage range signal between the two collector circuits. Push-pull gain corresponds to about ± 1 0 centimeters positioning range of the stage is approximately 2.2. -
Page 17: Switching Circuit
Circuit Description— Type M The signal is taken from the junction of R5326 and R5327 SWITCHING CIRCUIT located in the common-emitter circuit of Q5324 and Q5334. The R5326-R5327 junction is a convenient low-impedance Ring Counter point for extracting the signal without affecting the M-Unit bandwidth and with least pick up of switching transients The Ring Counter consists of Q6315, Q6325, Q6335 and when using the M unit in the CHOPPED mode. - Page 18 Circuit Description— Type M Matrix currents through R6320, R6330, R6340 and R6360 Chopped multi-trace operation. When the ALTER reverse bias D6360 and forward bias D6352. D6352 sets NATE/CHOPPED switch is set to the CHOPPED position and the base level of Q6364. Transistor Q6350 is clamped into two or more channels are on, the Switching B.O.
- Page 19 Circuit Description— Type M The signal at the anode of D6352 is a single regenerated approximately 0.5 ma matrix current flows through R6320. negative-going pulse that occurs each time the sync trigger When channel C and D MODE switches are set to OFF, from the oscilloscope is applied to the Q6350 base circuit.
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Page 20: Heater Circuit
Circuit Description— Type M around the secondary, driving the base in a positive direc Blanking Amplifier Q6364 amplifies and inverts the back- tion in excess of that needed to turn off the transistor. The swing signal. The Q6364 collector circuit, during this mode base and emitter return to their original level and transistor of operation, has the following configuration. - Page 21 Circuit Description— Type M to the emitter circuits of Q6364 and Q6350.) The +50 volts ference in heater current drawn by the Nuvistors (135 ma) goes to the plate circuit of V5323 (four channels) and the and the current drawn by the remaining tubes (150ma). +69 volts goes to the plate circuit of V5364 and V5374.
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Page 22: Preventive Maintenance
It is advisable to have a stock of solder containing about visual check should be performed if the unit becomes inop 3% silver if you frequently perform work on Tektronix erative, or needs repair or recalibration. Apparent defects instruments. This type of solder is used in printed circuitry may include loose or broken connections, damaged con... - Page 23 Maintenance— Type M 6. Do not attempt to fill the notch on the strip with solder; instead, apply sufficient solder to cover the wire adequately and to form a slight fillet on the wire, as shown in Fig. 4-3. In soldering to metal terminals (interconnecting plug, pins on a tube or a transistor socket) a similar technique should be employed.
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Page 24: Troubleshooting
Maintenance— Type M Ceramic Terminal Strips Tektronix since they are normally difficult or impossible to obtain from other sources. All parts can be obtained through your local Tektronix Field Engineering Office. To remove a ceramic terminal strip, unsolder all com... - Page 25 Maintenance — Type M Fig. 4 -7 . Right-side view and loft-rear portion of tho M Unit showing tho lototion of all tost paints. http://manoman.sqhill.com...
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Page 26: Troubleshooting Procedures
Maintenance— Type M Substituting an M or CA Unit is suggested because either CAUTION of these units aids in isolating such troubles as loss of sync Do not substitute tubes or Nuvistors when the M or improper chopped-mode blanking to either the oscillo Unit is operating, as this w ill open the filam ent scope or the plug-in unit. - Page 27 Maintenance— Type M c. If trace appears when shorting the bases of the tran One cause of dc imbalance is improper adjustment of sistors together but disappears when jumper is re the VERT. POS. RANGE control. Check the adjustment by moved, check for trouble in the base circuits of Q5324 performing step 3 in the Calibration procedure.
- Page 28 Maintenance— Type M operation, this indicates trouble in the Switching B.O. and all channels, a change in gain characteristics of the Output Chopped Mode Blanking Amplifier, or a loss of sync from Amplifier is indicated. If tubes are causing the trouble, it the oscilloscope time-base generator.
- Page 29 (a) Distortion— Signal applied directly. Set the VOLTS/CM switch to .02. Apply a fast-rise squarewave from a low- impedance signal generator, such as a Tektronix Type 105 Square-Wave Generator, to the input connector. If it is nec essary to attenuate the signal use a resistive (non-capacitive) divider.
- Page 30 Maintenance— Type M 17. Switching Transients Visible in Chopped Mode 16. Waveform Distortion, All Channels If the switching transients are visible during multi If you note waveform distortion on all channels when the trace chopped-mode operation, the trouble is in the same fast-rise step signal is applied to each, you can assume Chopped Mode Blanking Amplifier Q6364 stage (if you are the distortion is produced in the Output Amplifier.
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Page 31: Equipment Required
10X ; input capacitance, approximately Test equipment used in a particular step should be left 10 pf. (Tektronix Part No. 010-0125-00 UHF or 010- connected at the end of that step unless instructions state 0127-00 BNC.) otherwise. Similarly, controls not mentioned are assumed... -
Page 32: Preliminary Procedure
Calibration— Type M (14) 1— BNC male to UHF female adapter (Tektronix Part (11) Miscellaneous: No. 103-0032-00). 1— Alligator clip and cover. *Needed only if instrument hat BNC connectors 1—3-inch jumper lead with 4 " insulated test prods connected to each end. -
Page 33: Calibration Procedure
Calibration— Type M TABLE 5-1 Nominal Resistances at Interconnecting Plug Polarity o f Meter Lead Resistance Remarks to Ground Number Connected to Ground 9.4 k H.F. PEAKING control*-ccw + or — 11.3k H.F. PEAKING control*-cw + or — Connected to ground. H.F. - Page 34 Calibration— Type M 4. Check Input Coupling Capacitor for Leakage (All To make the check use three short patch cords (6” long) to connect the four inputs together, and use a fourth patch Channels) cord to ground the inputs. Set the channel A MODE switch NOTE to DC NORM, and the VOLTS/CM switch to .02.
- Page 35 Calibration— Type M TABLE 5-2 12. Check Variable Gain Control (All Channels) VOLTS/CM Switch Attenuation Check This step checks the operation of the VAR, GAIN con trol for each channel. Oscilloscope Vertical Am plitude VOLTS/CM Deflection Increase the signal amplitude of the oscilloscope Ampli C alibrator Output Switch Setting in Centimeters...
- Page 36 Calibration— Type M Fig. 5-3. Adjusting the input capacitance and attenuator compensation: (a ) proper adjustment; (b ) improper input-capacitance adjust ment; (c) attenuator over compensated. Sweep rate: 0.5 millisec/cm. Maintain approximately 3 centimeters of vertical deflec Set the A VOLTS/CM switch to .02 and increase the tion by adjusting the Output Amplitude control on the output amplitude of the square-wave generator to produce square-wave generator each time the VOLTS/CM switch...
- Page 37 Calibration— Type M Connect another short patch cord between the “ A ” TABLE 5-4 SIGNAL OUT connector and the channel B input connector. Square-Wave Response Check If the channel B trace is displaced from the A trace, care Square-Wave Generator Oscilloscope Time/Cm fully adjust the OUTPUT DC LEVEL control until the channel Switch Setting...
- Page 38 Calibration— Type M ( a ) • H~H~-H 1 1 -H M M 1 (b ) (d ) Fig. 5-4. Checking the high-frequency compensation of the M Unit. Sweep rate: 0.1 psec/cm. (a ) Peaking circuits properly adjusted, (b ) L5363 and L5373 properly adjusted—...
- Page 39 Calibration— Type M two centimeters of deflection for the channel B waveform. display on the screen. Adjust the oscilloscope Triggering Measure the time interval between the 10% and 90% Level and Stability controls to obtain a stable A and B amplitude levels on the rising portion of the squarewave.
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Page 40: Section 6 Parts List And Diagrams
If a part you have ordered has been replaced with a new or improved part, your local Tektronix Field Office will contact you concerning any change in part number. ABBREVIATIONS AND SYMBOLS... - Page 41 Parts List— Type M FRONT © TYPE M PLUG-IN UNIT 'oui- t . a c i " A - f I O N A t O U T I M I O 4 T p f O A tN ADJ PC §...
- Page 42 Parts List— Type M FRONT SERIAL/MODEL NO. REF. DESCRIPTION PART NO. EFF. DISC. SOCKET, banana jack, black 136-0106-00 136-0138-00 6329 SOCKET, banana jack, black 136-0140-00 6330 SOCKET, banana jack, charcoal WASHER, insulating 210-0895-00 210-0465-00 NUT, hex, y4-32 x% x % 2 inch 210-0223-00 LUG, solder, V4 inch hole, lock 358-0075-00...
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Page 43: Right Side
Parts List— Type M RIGHT SIDE http://manoman.sqhill.com... - Page 44 Parts List— Type M RIGHT SIDE S E R IA L /M O D E L N O . REF. D E S C R IP T IO N PART N O . N O . EFF. D ISC 179-0566-00 CABLE, harness, pot 124-0149-00 STRIP, ceramic, 7 notches x...
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Page 45: Left Side
Parts List— Type M LEFT SIDE © © IP | ® http://manoman.sqhill.com... - Page 46 Parts List— Type M LEFT SIDE SERIAL/MODEL NO. REF. DESCRIPTION PART NO. EFF. DISC. BRACKET, pot 406-0726-00 SCREW, 10-32 x % inch BHS 211 -0507-00 210-0006-00 LOCKWASHER, internal, # 6 NUT, hex, 6-32 x % inch 210-0407-00 STRIP, ceramic, 3 /4 inch x 7 notches, clip mounted 124-0089-00 SPACER, nylon, molded 361-0009-00...
- Page 47 Parts List— Type M REAR SERIAL/MODEL NO PART NO DESCRIPTION DISC 131 001700 CONNECTOR, chassis mounted, 16 contact, male 211 0008 00 SCREW, 4 40 x '/„ inch BHS 210 0004 00 LOCKWASHER, internal, # 4 210 0201 00 LUG, solder, SE4 210 0406 00 NUT, hex, 4-40 x J /u inch 384 051000...
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Page 48: Standard Accessories
Parts List— Type M STANDARD ACCESSORIES S E R IA L /M O D E L N O . REF. D E S C R IP T IO N PART N O . N O . EFF. D IS C . ADAPTER, BNC to binding post 103-0033-00 X3120... -
Page 49: Parts List
PARTS LIST Values are fixed unless marked Variable. Tektronix Ckt. No. Part Number Description S/N Range Bulbs B5323A,B,C,D 150-0035-00 Neon AID X5970-up Capacitors Tolerance ± 2 0 % unless otherwise indicated. Tolerance of all electrolytic capacitors are as follows: (with exceptions) 3V —... - Page 50 Capacitors (C o n t'd j Tektronix Ckt. No. Part Number Description S/N Range C5390 283-026 .2 ft. f Discap 25 v C5391 283-010 Discap 50 v C5392 Use 283-057 .1 /if Discap 200 v C5394 283-004 .02 /if Hi-Kap...
- Page 51 Diodes (C o n t'd ) Tektronix Ckt. No. S/N Range Part Number Description Use *152-0075-00 101-824 D6352 Tek Spec Germanium D6352 Germanium 825-9499 152-075 6075 D6352 *152-0185-00 Replaceable by 1N4152 9500-up Silicon D6355 T12G Germanium X825-9499 152-008 D6355 *152-0185-00...
- Page 52 Resistor (C o n t'd ] Tektronix Ckt. No. Part Number Description S/N Range R5332 A,B,C,D Var. DC BAL. 311-258 100 n Vs w R5333 A,B,C,D 302-101 101-2759 io o a Vs w R5333 A,B,C,D 302-680 2760-5789 68 0 Vs w...
- Page 53 Resistor fConf’c/J Tektronix Description S/N Range Ckt. No. Part Number 6340-up R5382 303-0822-00 8.2 k R5384 303-912 9.1 k 311-008 Var. HF Peaking R5385 R5386 303-912 9.1 k 47 0 R5388 316-470 316-470 47 0 101-6339 R5389 Vi w 303-0822-00 8.2 k...
- Page 54 Resistors (Cont’d) Tektronix Ckt. No. Description Part No. S /N Range V s w R6342 2.94 k Prec. 318-018 R6343 318-009 10.1 k Prec. V s w R6344 318-009 10.1 k Prec. V s w R6345 318-009 10.1 k Prec.
- Page 55 Transistors (C o n t'd ) Tektronix Ckt. No. Part No. Description S/N Range Q6315 *151-0219-00 2N4250 (or Equivalent) 9500-up Q6325 151-076 2N2048 101-9499 Q6325 *151-0219-00 2N4250 (or Equivalent) 9500-up Q6335 151-076 2N2048 101-9499 Q6335 *151-0219-00 2N4250 (or Equivalent) 9500-up...
- Page 56 _____________ CHANNEL A __________ SIGNAL OUTPUT AMPLIFIER t y p e p l u g u n i t...
- Page 57 ---------------O U T P U T A M P L IF IE R - > l ' D IF F E R E N T IA L O U T P U T A M P LIF IE R CATHODE F O L L O W E R V 5 3 6 4 V5383...
- Page 58 T Y P IC A L S W ITC H E D ATTENUATOR A M P L IF IE R ( 4 REQ'D) -------—— ----------------------- — O U TPU T A M P L IF IE R ----------------------------- A M D 5 W 5 3 0 0 C H A N N E L S W I T C H E D...
- Page 59 T Y P IC A L S W IT C H E D ATTENUATOR AND A M PLIFIER (<4- REQ'D) ■O UTPUT A M P L IF IE R - 5 W 5 3 0 0 - —\ M O D E ]- F O R A D D IT IO N A L D E T A IL S O F M O D E S W IT C H E S S E E C H A N N E L S W IT C H IN G C S S I O A J _ C 5 3 I O B _ ! ^ R 5 3 I O c |...
- Page 60 C H O P P E D M O D E R IN G C O U N T E R S W ITC H IN G B L A N K IN G A M P L IF IE R H (C H A N N E L A) (C H A N N E L 8 ) c h a n n e l...
- Page 61 C H O P P E D M O D E R IN G C O U N T E R S W IT C H IN G B .O . B L A N K IN G A M P L IF IE R - '"! (C H A N N E L A) (C H A N N E L B ) (C H A N N E L C)
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Page 62: Manual Change Information
MANUAL CHANGE INFORMATION At Tektronix, we continually strive to keep up with latest electronic developments by adding circuit and component improvements to our instruments as soon as they are devel oped and tested. Sometimes, due to printing and shipping requirements, we can’t get these changes immediately into printed manuals. - Page 63 TENT SN 93^0 TYPE M ELECTRICAL PARTS LIST CORRECTION CHANGE TO: D5391 1N753A 0.4 v, V, ± 0280-00 6 .2 < Mil,191/468...
- Page 64 TYPE M TENT SN 9660 ELECTRICAL PARTS LIST CORRECTION CHANGE TO: Q5344A,B 151-0232-00 Silicon Dual M15,594/170...