Tektronix Type B Plug-In User manual

I NSTRUCTION
IVIAIM U A L
F>LU G -II\I
Tektronix, Inc.
S.W. M illikan Way • P. O. Box 500 • Beaverton, Oregon • Phone Ml 4-01 1 • Cables: Tektronix
Tektronix International A G.
Terrassenweg 1A • Zug, Switzerland • PH.042-49192 • Cable: Tekintag, Zug Switzerland • Telex 53.574
070-219
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WARRANTY
All Tektronix instruments are warranted
against defective materials and workman
ship for one year. Tektronix transformers,
manufactured in our own plant, are war
ranted for the life of the instrument.
Any uestions with respect to the war
ranty mentioned above should be taken up
with your Tektronix Field Engineer.
Tektronix repair and replacement-part
service is geared directly to the field, there
fore all re uests for repairs and replace
ment parts should be directed to the Tek
tronix Field Office or Representative in your
area. This procedure will assure you the
fastest possible service. Please include the
instrument Type and Serial number with all
re uests for parts or service.
Specifications and price change priv
ileges reserved.
Copyright © 1960 by Tektronix, Inc.,
Beaverton, Oregon. Printed in the United
States of America. All rights reserved. Con
tents of this publication may not be repro
duced in any form without permission of
the copyright owner.
Type B
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CONTENTS
Section 1 Specifications
Section 2 Operating Instructions
Section 3 Circuit Description
Section 4 Maintenance
Section 5 Calibration Procedure
Section 6 Parts List and Schematic
Type B
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Type B ® ®
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General Mechanical Specifications:
The Type B Plug-In Unit is a wide-band, high-gain cali
brated preamp, designed for use with Tektronix Type 530-,
540- and 550 Series Oscilloscopes. The unit contains a dc
amplifier similar to that in the Type A Unit preceded by
a wide-band ac amplifier.
Construction—Aluminum-alloy chassis.
Finish—Photo-etched anodized panel.
Weight—3’/2 lbs.
Type B Specifications
Instrument
Used With Transient Response
.05 v to 20 v/cm Transient Response
.005 v to .02 v/cm
541, 541 A, 543,
545, 545A, 555
Risetime Pass Band* Risetime Pass Band*
.018 fisec DC—20 me
2 cps—20 me ac .03 /isec 3 cps—12 me
551 .02 /usee DC— 18 me .03 fisec 3 cps—12 me
531, 531 A, 533,
535, 535A .035 fisec DC—10 me
2 cps— 10 me ac .04 fisec 3 cps—9 me
532 .07 fisec DC—5 me
2 cps—5 me ac .07 fisec 3 cps—5 me
* Down not more than 3 db at indicated limits.
Plug-In Unit Amplifier
Risetime at .05 to 20v/cm—.01 fisec.
Risetime at .005 to .02 v/cm—.03 fisec.
Deflection Factor:
.05 v/cm to 50 v/cm dc.
.005 v/cm to 50 v/cm ac.
Signal Inputs—Two signal inputs with more than 0 db iso
lation.
Step Attenuator:
Twelve positions, calibrated, from .005 v/cm to 20 v/cm,
accurate within 3% when set on any one step.
Maximum Allowable Combined DC and Peak AC
Input Voltage— 00 V.
Input Impedance: —1 megohm, 47 /ifif.
With P410 probe—10 megohms, 11 /ifif.
With P510 probe— 10 megohms, 14 /ifif.
With P 000 prove— 10 megohms, 11.5/x/xf-14.5/x/xf.
FUNCTIONS OF CONTROLS
AND CONNECTORS
INPUT A
INPUT B Separate UHF coax connectors to the pre
amp by way of the INPUT SELECTOR
switch.
INPUT
SELECTOR Four-position switch to select either of the
two inputs and the type of input coupl
ing.
DC BAL Screwdriver control to adjust the ampli
fier balance so the trace does not shift
as the VARIABLE control is rotated.
VERTICAL
POSITION Control to position the trace vertically.
GAIN ADJ. 1 Screwdriver control to set the basic gain
of the dc amplifier.
GAIN ADJ. 2 Screwdriver control to set the gain of the
ac amplifier to 10.
VOLTS/CM Twelve-position switch to select the cali
brated vertical-deflection sensitivities.
VARIABLE Control to vary the gain over a range
of about 2’/2 to 1.
Accessories
2— Instruction Manuals
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OPERATING
INSTRUCTIONS
General
The Type B Plug-In Unit is designed to operate as a
preamplifier for a Tektronix 530-Series, 540-Series or 550-
Series Oscilloscope. We assume that it will be operated
in that manner in the following instructions.
Input Connections
Be careful when you make connections to the preamp
INPUT connectors that the external circuitry does not cause
deterioration of the waveform. Improper termination of
cables may cause ringing or loss of frequency response. If
you use unshielded leads, keep them short as possible to
minimize hum. Leads which pass near the cathode-ray-
tube screen may pick up some ripple from the high-voltage
power supply. If this occurs try relocating the leads or use
additional shielding.
Two cables can be connected to the preamp at once. You
can then select the signal on either cable with the INPUT
SELECTOR switch. However, if one signal is very much
larger than the other, some crosstalk may occur and the
cable having the strong signal should be disconnected.
Probe Information
Early Type B Units were furnished with P400-series or
P500-series probes. P500-series probes are usable in the
range from DC to 10 megacycles. P400-Series probes should
be used with 540- and 550-series oscilloscopes where fre
quencies in excess of 10 megacycles are likely to be en
countered.
P400-series probe bodies are 3/4-inch in diameter. They
are molded of fiberglass-reinforced alkyd and have on inter
nal brass shield. Noses are color-coded to indicate attenua
tion ratios. Length is 33/4 inches without tip. Two Tektips
were furnished with each probe—a straight tip and freely-
rotating hooked tip. The tips increase probe length by
about one inch, adding less than 0.5 /x/xf to the input cap
acitance. P400-series probes have a 42-inch coaxial cable
with uhf connector.
Probe Adjustment
The Type P 000 probe may be used with either the 530-
or 540-Series Oscilloscopes. Be sure to check the adjustment
of the probe when you first connect it to the plug-in. Touch
the probe tip to the calibrator output connector and dis
play several cycles of the calibrator waveform. If the top
and bottom of the displayed waveform is not flat, loosen
the locking ring by turning it in a counterclockwise direction.
Rotate the barrel of the probe as necessary to compen
sate the probe. Tighten the locking ring carefully after com
pensating the probe, being careful not to disturb the probe
adjustment.
An adjustable capacitor compensates for slight variations
in input capacitance from one instrument to another. This
PROBE CHARACTERISTICS
Probe Color Code Attenuation
Ratio INPUT IMPEDANCE Insertion Loss
at 30 me (db) Voltage
Rating
(Peak-to-Peak)
Resistance
(megohms) Typical Capacitance Minimum * Maximum **
P405 Green 5:1 512 /x/xf 1 9 /x/xf 1 to 2 00
P410 Brown 10:1 10 8 /x/xf 11 /x,uf 1 00
P420 Red 20:1 10 5.5 /x/xf 7
/ X / x f 100
P450 Clear-Green 50:1 10 3.5 /x/x f 3.5 /x/xf 1 1000
P450-L t Clear-Green 50:1 10 2.5 /x./xf 2.5 /x/xf 1 1000
P4100 Clear 100:1 10 2.5 /x/xf 1 1000
* When connected to instruments having 20 fifif input capacitance.
** When connected to instruments having 50 fi/ii input capacitance,
t W ill not adjust to instrument having over 25 fi/xt input capacitance.
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Operating Instructions — Type B
capacitor is located in the probe body in the P405, P410,
P420, and in the termination block at the instrument end of
the cable in the P450, P450-L and P410Q. It takes only a few
seconds to check this adjustment, and it is a good practice
to make this check each time the probe is to be used. Sim
ply touch the probe to the oscilloscope calibrator-output
terminal and observe the calibrator waveform on the screen.
If necessary, adjust the trimmer for a flat top on the cali
brator square wave. For critical adjustment of the P4100,
a faster-rising square wave, such as the output of the Tek
tronix Type 104A or Type 105, should be used.
Preventative Maintenance
Regular inspection of the nose and cable fastening screws
will help prevent possible mechanical damage due to
twisting. A small nylon screw holds the nose in place, and
an alien setscrew grips the cable firmly. Tighten these screws
if they work loose.
Probe Repair
To disassemble, remove the nylon screw and loosen the
alien setscrew. Slide the probe body back over the cable.
Examine the layout carefully before proceeding. The cen
ter conductor of the cable is extremely fragile— be careful
not to break it when removing a probe part. Replacement
parts can be obtained through field offices or directly from
the factory. When resoldering, it is important to get a good
connection between the probe resistor and the center con
ductor of the cable. Reassemble the probe and tighten the
screws.
Coupling
It is sometimes unnecessary or undesirable to display the
dc level of the waveform. In the two AC positions of the
INPUT SELECTOR switch, a capacitor in series with the
input blocks the dc component of the waveform so that only
the ac component is displayed.
Deflection Sensitivity
The VOLTS/CM switch inserts frequency-compensated at
tenuators ahead of the amplifier. The VARIABLE control
provides continuous adjustment of the deflection sensitivity
between the values indicated by the VOLTS/CM switch.
NOTE
The VARIABLE control must be clockwise to CALIBRAT
ED position for the sensitivity to be as indicated by the
VOLTS/CM control.
Gain Adjustment
Aging of tubes will affect the gain of the plug-in unit.
After the plug-in unit has been in use for a period of time
the gain adjustment should be checked. Display a calibrator
waveform of 0.2 volts peak to peak with the VOLTS/CM
switch in the .05 position. Adjust the GAIN ADJ. 1 control
until the displayed waveform is four graticule divisions in
amplitude. Be sure the VARIABLE control is turned clock
wise to the CALIBRATED position before making this ad
justment.
Now set the calibrator at 20 MILLIVOLTS and turn the
VOLTS/CM switch to .005. Adjust the GAIN ADJ. 2 con
trol until the amplitude of the displayed waveform is four
divisions.
DC Balance Adjustment
The need for adjustment of the DC BAL control is indi
cated by a shift in the position of the trace as the VARIABLE
control is rotated. This is caused by tube aging and the
resultant shift in operating potentials. This adjustment should
be made after the GAIN ADJ. control is set. Rotate the
VARIABLE control back and forth and adjust the DC BAL.
control until the trace position is no longer affected by ro
tation of the VARIABLE control.
Positioning Adjustment
The VERT POS RANGE control balances the dc output
level so the full range of the front-panel positioning control
can be utilized. The VERT POS RANGE control is located at
the left to the rear of the plug-in unit and is accessible
when the left side panel is removed. Center the VERTICAL
POSITION control. Adjust the VERT POS RANGE control
to center the trace on the screen.
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+ 300V
SECTION 3
CIRCUIT
DESCRIPTION
General
The Type B Plug-In Unit has a maximum sensitivity of .05
volts per centimeter dc and .005 volts per centimeter ac.
The circuit consists of one stage of amplification preceded
and followed by cathode followers, with an additional, ac-
coupled stage inserted in the three most sensitive positions
of the VOLTS/CM switch.
Input Connectors
There are two input connectors which can be switched
into the input circuits by SW3022, the INPUT SELECTOR
switch. This switch is wired physically so at to reduce coupl
ing between inputs to a minimum. Blocking capacitor C3042
(C3012 S/N 101-3300) is shorted out in the DC positions ot
the selector switch.
Input Attenuators
The VOLTS/CM switch inserts frequency-compensated at
tenuators into the input circuit. Four attenuators are used
singly or in tandem pairs to produce nine fixed sensitivities.
The ac-coupled preamplifier, V4302, (V3302 S/N 101-3300),
is switched into the circuit in addition to the attenuators in
the three most sensitive positions to give a total of twelve
fixed sensitivities. Blocking capacitor C3042 (C3022 S/N
101-3300) is inserted in the AC ONLY positions of the
VOLTS/DC switch. The XI attenuation network compensates
for lead inductance in the input circuits.
Preamplifier
The preamplifier stage consists of V4302 (V3302 S/N 101-
3300) as a single ended pentode voltage amplifier, V4102B
(V3502A S/N 101-3300) as a cathode follower driver for the
amplifiers and V4102A (V3502B S/N 101-3300) as a low-
impedance voltage setter for the preamplifier screen grid.
R4352 (R3332 S/N 101-3300), a front-panel screwdriver con
trol labeled GAIN ADJ. 2, adjusts the degeneration in the
cathode of V4302 (V3302 S/N 101-3300) to set the gain of
the stage. The chassis-mounted screwdriver control, labeled
LOW FREQ. COMP, adjusts the time constant of the grid
circuit coupling network. This network, in combination with
the low-frequency boosting network, R4022, C4022A (S/N
3301-up) provides low-frequency compensation down to
less than 50 cps.
DC Balance
The DC BAL control, R4402 (R3 42 S/N 101-3300), pro
vides an adjustable, dc grid voltage for V3552 (V4102 S/N
101-3300) so that its cathode is at the same dc potential
as the cathode of V3402 (V4002 S/N 101-3300). When this
control is properly set, no change in vertical positioning
will result when the VARIABLE control is rotated.
Input Cathode Follower
The input cathode follower, V3252 (V3502A S/N 101-
3300), isolates the input circuits from changes in capaci
tance as the VARIABLE control is rotated. R3282 (R4012 S/N
101-3300) is a current-limiting resistor to limit the grid current
in the event an excess voltage is applied to the input.
Amplifier
The amplifier stage, V3402 and V3552 (V4002 and V4102
S/N 101-3300), is a common-cathode phase-splitter ampli
fier. Coils L3402 and L3582 (L4202 and L4402 S/N 101-3300)
form peaking networks in the plate circuits. R3402 (S/N
3301-up) provides the current for the amplifier plates, and
a tap to the heater string provides a low impedance at this
point.
The VARIABLE VOLTS/CM control, R3512 (R40 2 S/N 101-
3300), varies the gain over a 2V2-to-l ratio by varying the
degeneration in the cathode circuit. R3542 (R4102 S/N 101-
3300), labeled GAIN ADJ. 1, varies the current in this stage
to set the gain to agree with the front-panel calibration.
Vertical positioning is produced by two dual potentio
meters connected to the plates of the amplifier so that cur
rent through one plate load is increased as current through
the other plate load is decreased. Since the amplifier is dc
coupled beyond this point, the change in plate voltage
which occurs changes the position of the trace on the cath
ode-ray tube. The current drawn by these potentiometers is
added to the heater string to provide the additional cur
rent required by V4302 (S/N 3301-up).
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Circuit Description — Type B
Output Cathode Followers
Output cathode followers are used to drive the capaci
tance of the interconnecting plug and main-amplifier input
circuit. The cathode follower circuit is modified by resistors
in the plate circuits and by capacitors cross-connected from
the plates to the opposite cathodes. This modification im
proves the high-frequency balance of the plug-in unit.
The H.F. PEAKING control, R3872 (S/N 3301-up) varies the
current in the cathode followers. This changes the imped
ance at the cathodes and changes the effect of the series
peaking coils, L3842 and L3942 (L4512 and L45 2 S/N 101-
3300), tied to these cathodes.
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PARTS ORDERING AND REPLACEMENT
Instruction Manual
A Tektronix instruction manual usually contains hand
made changes to diagrams and parts list, and sometimes
text. These changes are in general appropriate only to the
instrument the manual was prepared for. These hand-made
corrections show changes to the instrument that have been
made after the printing of the manual.
There is a serial number on the frontispiece and on the
warranty page of this manual. This is the serial number of
your instrument. Be sure the manual number matches the
instrument number when you order parts.
NOTE
Always include the instrument type and SERIAL
NUMBER in any correspondence regarding the
instrument.
Standard Components
Tektronix will supply replacement components at current
net prices. However, since most of the components are
standard electronic and radio parts you can probably ob
tain them locally faster than we can ship them to you from
the factory in Portland, Oregon. Be sure to consult the
instruction manual to see that tolerances are required.
Selected Components
We specially select some of the components, whose values
must fall within prescribed limits, by sorting through our
regular stocks. The components so selected will have stand
ard RETMA color coding showing the value and tolerance of
the stock they were selected from, but they will not in gen
eral be replaceable from dealer's stocks.
Checked Tubes
To obtain maximum reliability and performance we
check some of the vacuum tubes in our instruments for such
characteristics as microphonics, balance, transconductance,
etc. We age other tubes to stabilize their characteristics.
Since there are no well defined standards of tube perform
ance we have established our own arbitary standards and
SECTION 4
MAINTENANCE
have developed equipment to do this checking. These
checked tubes can be purchased through our local Field
Engineering Offices or directly from the factory in Portland,
Oregon.
Tektronix Manufactured Parts
Tektronix manufactures almost all of the mechanical parts
and some components used in the instrument. If you order a
mechanical part be sure to describe the part completely to
prevent any unnecessary delay in filling your order. When
you have any guestions about mechanical parts or Tektronix
manufactured components contact our nearest Field
Engineering Office or write to the Field Engineering De
partment at the factory in Portland, Oregon.
GENERAL INFORMATION
Color Coding
We use color-coded wires in the instruments to help
identify the various circuits. These wires will be either a
solid color or will be a solid color (including black and
white) with one or more colored stripes. The colored stripes
are ‘‘read1’ in the same manner as the RETMA resistor color
code. In the case of multiple stripes the wide stripe is read
first.
Wires carrying positive regulated-power-supply voltages
are white and the stripes indicate the supply voltage. For
example, the + 2 2 5 -V supply bus will be coded red-red-
brown (2-2-1) giving two significant figures and the decimal
multiplier.
The negative-supply bus wires are black and the stripes
indicate the supply voltage. For example, our most common
negative-supply voltage is —150v and is carried by a
black wire coded brown-green-brown (1-5-1).
The mains-voltage leads to the power transformer are
yellow and coded brown-brown-brown (1-1-1).
The tube heater leads are white and coded -1, -2, -3,
etc., not to indicate that the voltages are different but to
differentiate between circuits.
In other respects the color coding will vary from instru
ment to instrument. In general all signal-carrying leads are
white and coded with a single colored stripe. In a few
places where the number of leads exceeded the capabilities
of single-stripe coding we have used solid-color leads.
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Maintenance — Type B
Soldering Precautions
The solder used on the ceramic terminals of this instru
ment must contain a small percentage of silver. Repeated
use of ordinary tin-lead solder will dissolve the fused bond
of silver that makes the solder adhere to the porcelain,
especially if the soldering iron is quite hot.
A quantity of the silver-bearing holder that we use at
the factory is attached to each major instrument having
ceramic strips. This solder, containing approximately 3%
silver, is not readily available through regular channels. If
you need additional silver-bearing solder for maintenance
purposes you can purchase it from Tektronix in one-pound
spools.
TROUBLE-SHOOTING PROCEDURE
Troubleshooting of plug-in units is somewhat complicated
by the need to determine whether the trouble observed
is in the plug-in unit or in the oscilloscope. Many troubles
can be quickly isolated by substituting another plug-in unit
and looking for the same indications. Among the troubles
which fall into this category are insufficient gain, inability
to position the trace, noise, unbalance, and severe wave
form distortion. Minor waveform distortions such as might
be caused by high-frequency peaking coils or delay-line
trimmers can be isolated by this method only by substituting
another plug-in unit of equal or superior bandwidth and
checking for the same distortion.
Noise and unbalance problems can also be isolated by
connecting a jumper from pin 1 to pin 3 of the interconnect
ing plug. If the trouble remains, it is probably not in the
plug-in unit.
Most troubles are caused by tube failures and you
can frequently find them by finding the bad tube and re
placing it with a good one. It is a good practice to inspect
components in the circuit with the bad tube for possible
overheating as a result of the tube failure. One way to
find bad tubes is to try replacing suspected tubes with
good ones.
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OIM S
CALIBRATION
PROCEDURE
General
The Type B is a stable instrument and should not require
frequent calibration. However, it is sometimes necessary,
after tube replacements or extensive maintenance work to
check the adjustment of certain important controls to insure
precise and accurate operation of the plug-in unit.
E uipment Re uired
Before calibrating your Type B, be sure that the Type 530-
or 540-Series Oscilloscope you are using has been checked
for power supply outputs, power supply ripple and regula
tion, vertical amplifier gain, vertical amplifier band pass
and calibrator accuracy.
Other equipment required includes:
Type 190 or 190A Constant-Amplitude Signal Generator
or equivalent, providing constant amplitude sine waves from
about 50 kc to 30 me with output amplitude constant within
±2%.
Type 105 Square-Wave Generator or equivalent with fre
quency range of about 25 cycles to 1 me, rise time at least
.02 microseconds and frequency indication accuracy of no
poorer than ±3 % .
Type 107 Square-Wave Generator or equivalent with fre
quency range of 400 kc to 1 me, peak-to-peak output volt
age of at least 0.1 to .5 volts, and risetime of 3 nanoseconds
or less.
Input capacitance standardizer, (CS 47), 52 Cl Terminating
Resistor, 5:1 L pad, 52 Cl cable and 52 fi terminating resistor.
Adjustment Procedure.
1. The first step in calibration of your Type B should be
to determine the "Vertical System Electrical Center” of
your test scope. If a test load unit is available, insert it in
the oscilloscope. Depress the PRESS TO SHORT button and
observe the vertical level of the trace. This can also be ac
complished by placing a jumper between pins 1 and 3 of
the interconnecting plug on your Type B Unit, thus shorting
the plug-in output, and again observing the vertical level
of the CRT trace. This level is referred to later in the cali
bration procedure.
2. Before starting calibration of your Type B Unit, be sure
that the left side and bottom panels are removed from your
oscilloscope. Unless otherwise specified, oscilloscope con
trols will be set as follows:
HORIZONTAL DISPLAY MAIN OR “A" SWEEP,
NORMAL
TRIGGERING MODE AUTOMATIC
TRIGGER SLOPE -IN T
STABILITY PRESET
TIME/CM 1 MILLISEC
3. Adjust DC BAL.
Position the trace on the oscilloscope to about the cen
ter horizontal graticule line. Adjust DC BAL so that the
trace does not shift vertically while the VARIABLE VOLTS/
CM control is shifted throughout its range.
4. Adjust Vert. Pos. Range.
Set the VERTICAL POSITION knob at mid-range. Adjust
the VERT. POS. RANGE or POSITIONING ADJ. control so
that the trace is at “Vertical-System Electrical Center."
5. Set GAIN ADJ.
From the CALIBRATOR of the oscilloscope, apply .2 volts
to INPUT A and set GAIN ADJ. 1 for 4 cm of vertical de
flection. Set VOLTS/CM switch to .005 and apply 20 milli
volts from the CALIBRATOR to INPUT A. Set GAIN ADJ.
2 for 4 cm of vertical deflection.
6. Adjust Main Amplifier Input Capacitor.
Set plug-in controls to INPUT A, DC, VOLTS/CM to .05
and VARIABLE to CALIBRATED. Connect the Input Capaci
tance Standardizer to INPUT A. From the Type 105, apply
a 1 kc signal. Adjust the Type 105 OUTPUT AMPLITUDE
for 3.5 cm of vertical deflection on the scope. In Type B
Units S/N 101 through 3300, adjust C3002 for the best
square wave. For S/N's 3301 and up, adjust C32 2.
7. Adjust VOLTS/CM Switch Compensations.
Leave the Type 105 and Type B set as in the previous
step, with the exception of the Type B VOLTS/CM Switch.
In Type B Units S/N 101 through 3300, adjust the 1 kc
square wave from the Type 105 for optimum square corner
and optimum flat top as follows:
VOLTS/CM FLAT TOP ADJUST SQUARE CORNER
ADJUST
0.1 C31 2 C3172
.2 C3192 C3202
.5 C3092 C3102
5.0 C3132 C3142
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Calibration Procedure — Type B
For Type B Units, S/N's 3301 and up, adjust as follows:
VOLTS/CM
0.1
.2
.5
5.0
SQUARE CORNER
ADJUST
C3232
C3172
C3112
C3072
FLAT TOP ADJUST
C3222
C31 2
C3102
C30 2
8. Adjust Preamplifier Input Capacitor.
Leaving Type 105 and Type B controls as before, with the
exception of the VOLTS/CM switch, adjust Type 105 OUT
PUT AMPLITUDE for 3.5 cm of vertical deflection and set
Type B VOLTS/CM to .005. In Type B Units S/N 101
through 3300, adjust C3322 for the best square wave. In
S/N's 3301 and up, adjust C4322.
9. Set Low-Fre uency Compensation
Set the VOLTS/CM control on the Type B Unit to .005.
From the Type 105, apply a 50-cycle signal to INPUT A.
Adjust LOW FREQ. COMP, for optimum square wave.
leading edge and slope back of leading edge. Adjust H.F.
PEAKING control for optimum square corner with no over
shoot. These controls are interacting, so several readjust
ments may be necessary. For Type B Units S/N 101 through
3300, adjust L4402 and L4202 for the best square wave.
11. Adjust Preamplifier High Fre uency Compensations.
Leaving the other controls as before, set the Type B
VOLTS/CM switch to .005. In Type B Units, S/N 3301 and
up, adjust L4032, L4042 and L41 2 for optimum square
wave. In some lower serial number instruments an adjust
able coil, L3 02 is provided for Preamplifier HF Compen
sation.
12. Check Fre uency Response.
Reset oscilloscope controls as follows:
TRIGGERING MODE AC SLOW
TIME/CM 100 MICROSEC
STABILITY full right (cw)
10. Adjust Main Amplifier High Fre uency Compen
sations.
Set oscilloscope TIME/CM control to .2 fiSEC and Type B
VOLTS/CM to .05. From the Type 107, apply 3 cm of signal
at approximately 450 kc to INPUT A. For Type B Units
S/N's 3301 and up, adjust L3402 and L3582 for optimum
Set Type B VOLTS/CM to .05. From the Type 190, apply
3 cm of signal at 50 kc to INPUT A. Adjust Type 190 to ob
tain a frequency of 20 me without changing 190 OUTPUT
AMPLITUDE, and check for at least 2.1 cm of vertical de
flection remaining. Reset the VOLTS/CM switch to .005
and repeat the same procedure, but check for 2.1 cm of
vertical deflection at 12 me.
5 -2 ®®
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PARTS LIST DIAGRAMS
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POWER. S U P P L Y
MAN U FACTU RERS OR C ATM ODE- FRAY OSCILLOSCOPES
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HOW TO ORDER PARTS
Replacement parts are available through your local Tek
tronix Field Office.
Improvements in Tektronix instruments are incorporated as
soon as available. Therefore, when ordering a replacement
part it is important to supply the part number including any
suffix, instrument type, serial number, plus a modification
number where applicable.
If the part you have ordered has been improved or re
placed, your local Field Office will contact you if there is a
change in part number.
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PARTS LIST
* 000-000 Asterisk preceding Tektronix Part Number indicates manufactured
by or for Tektronix, also reworked or checked components.
Capacitors Tektronix
Part Number
C3002 101-3300X 1.5-7 AAf Cer. Var. 500 v 281-005
C3012 101-3300X .001 Af Cer. Fixed 500 v GMV 283-000
C3022 101-1280 .1 Af PTM Fixed 00 v 285-528
1281-3300 .1 Af PTM Fixed 00 v 285-547
3301-up .001 Af Cer. Fixed 500 v GMV 283-000
C3042 X3301-up .1 Af PTM Fixed 00 v 20% 285-528
C3052 X4898-up 8 AAf Cer. Fixed 500 v ±0.5 AAf 281-503
C30 2 X3301 -up 4.5-25 AAf Cer. Var. 500 v 281-010
C3072 X3301-up 1.5-7 AAf Cer. Var. 500 v 281-005
C3082 X3301-up 250 AAf Mica Fixed 500 v 5% 283-543
C3092 101-3300X 1.5-7 AAf Cer. Var. 500 v 281-005
C3102 101-3300 4.5-25 AAf Cer. Var. 500 v 281-010
3301-3453 3-12 fifx. f Cer. Var. 500 v Use 281-010
3454-up 5-20 AAf Cer. Var. 500 v 281-010
C3112 101-3300 150 AAf Cer. Fixed 500 v 20% 281-524
3301-up 4.5-25 mif Cer. Var. 500 v 281-010
C3122 3301-3453 100 AAf Cer. Fixed 500 v Use 283-544
3454-up 150 AAf Mica Fixed 500 v 10% 283-544
C3132 101-3300X 1.5-7 AAf Cer. Var. 500 v 281-005
C3142 101-3300X 5-20 Ajuf Cer. Var 500 v Use 281-010
C3152 101-3300X .002 Af Mica Fixed 500 v 283-529
C31 2 101-3300 1.5-7 AAf Cer. Var. 500 v 281-005
3301-4483 3-12 AAf Cer. Var. 500 v 281-007
4484-up 5-20 Ajuf Cer. Var 500 v Use 281-010
C3172 101-3300 5-20 AAf Cer. Var. 500 v Use 281-010
3301-up 3-12 fifjL f Cer. Var. 500 v 281-007
C3192 101-3300X 1.5-7 Ajuf Cer. Var. 500 v 281-005
C3202 101-3300X 5-20 AAf Cer. Var. 500 v Use 281-010
C3212 101-3300X 22 AAf Cer. Fixed 500 v 10% 281-511
C3222 X3301 -3453 1.5-7 AAf Cer. Var. 500 v Use 281-007
3454-up 3-12 AAf Cer. Var. 500 v 281-007
C3232 X3301-up 4.5-25 Aluf Cer. Var. 500 v 281-010
C3252 X3301-up 270 AAf Cer. Fixed 500 v 20% 281-543
C32 2 X3301-up 1.5-7 AAf Cer. Var. 500 v 281-005
C3282 X3301-up .005 Af Cer. Fixed 500 v GMV 283-001
C3292 X3301-up .001 Af Cer. Fixed 500 v 283-000
C3302 101-3300X .001 Af Cer. Fixed 500 v GMV 283-000
C3322 101-3300 1.5-7 AAf Cer. Var. 500 v 281-005
3301-up .005 Af Cer. Fixed 500 v GMV 283-001
C3342 101-3300X 2 x 275 Af EMC Fixed v -20-1-50% (2)290-020
C34 2 101-3300X 3 x 10 Af EMC Fixed 350 v -2 0+50% 290-032
C3512 101-3300X .1 Af PT Fixed 00 v 20% 285-528
C3 2 101-3300X .01 Af PT Fixed 400 v 20% 285-510
C3842 X3301-up .005 Af Cer. Fixed 500 v GMV 283-001
C3942 X3301 -up .005 Af Cer. Fixed 500 v GMV 283-001
C4012 101-3300X .01 Af Cer. Fixed 500 v GMV 283-002
P AR tS l i s t — tYPE B1
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Tektronix
Part Number
Capacitors (continued)
C4022 101-3300 1.5-7/tjaf Cer. Var. 500 v i281-005
C4022A,B 3301 -up 3 x 10 «f EMC Fixed 350 v -20+ 50% 290-032
C4102 X3301 -up .001 nf Cer. Fixed 500 v GMV 283-000
C4132 X3301 -up .1 |lf PT Fixed 00 v 20% 285-528
C4322 X3301 -up 1.5-7 /ifif Cer. Var. 500 v 281-005
C43 2 X3301-13,359 275/2 iif PTM Fixed v -20+50 % (2)290-020
13,3 0-up 500 nf EMC Fixed v -20+50% 290-030
C4402 X3301-up .001 nf Cer. Fixed 500 v GMV 283-000
C4452 X3301 -up .005 nf Cer. Fixed 500 v GMV 283-001
C4512 X3301-up .01 nf Cer. Fixed 500 v 283-002
C4522 X3301-up .047 (if PTM Fixed 400 v 20% 285-519
C4532 X3301 -up .01 nf Cer. Fixed 500 v GMV 283-002
C4552 X3301 -up .001 nf Cer. Fixed 500 v GMV 283-000
C4702 101-3300X .1 iif PTM Fixed 400 v 20% 285-52
C4712 101-3300X .001 |tf Cer. Fixed 500 v GMV 283-000
C4722 101-32 X .001 Iif Cer. Fixed 500 v GMV 283-000
C4732 101-3300X .01 Ilf PTM Fixed 400 v 20% 285-510
C4742 101-32 X .001 Ilf Cer. Fixed 500 v GMV 283-000
Inductors
L3402 X3301-up 3.3- ith Var. core 27 -50 *114-053
L3432 X3301-up .3 ju.h Fixed *108-112
LR34 2 101-32 2.4 |ih Fixed, Wound on R34 2 *108-0 3
327-up 4. jtih Fixed, Wound on R34 2 *108-070
L3472 101- 21 11-18 »h Var. core 27 -503 *114-001
22-up 8.5-14 nh Var. *114-02
L3582 X3301-up 3.3- ith Var. core 27 -503 *114-053
LR3 02 101- 21 3.3-7 |th Var. core 27 -503 *114-017
22-up 3.8 ith Fixed, Wound on L3 02 *108-073
L3842 X3301-up .3 jub Fixed *108-112
L3942 X3301-up .3 nh Fixed *108-112
L4032 3301-152 9 4.8-8.5 fih Var. core 27 -503 use *114-020
15270-up 3.3-7 |ih Var. core 27 -503 *114-017
L4042 X3301-up 25-48 |th Var. core 27 -503 *114-052
L41 2 X3301-up 72-4.4 iih Var. core 27 -503 *114-007
L4202 101-307 2. -4.8 ith Var. core 27 -503 *114-011
308- 78 1.3-2.2 ith Var. core 27 -503 *114-003
79-up .92-1.5 ith Var. core 27 -503 *11+028
L4402 101-307 2. -4.8 ith Var. core 27 -503 *114-011
308- 78 1.3-2.2 iih Var. core 27 -503 *114-003
79-up .92-1.5 nh Var. core 27 -503 *11+028
L4512 101-3300X 0.45 ith Fixed *108-0 2
L45 2 101-3300X 0.45 ith Fixed *108-0 2
2PARTS LIST — TYPE B @®i
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Rectifiers Tektronix
Part Number
SR3342 X308-3300X 100 ma/plate
SR43 2 X3301-13359X 100 ma/plate
Note: SR43 2 was replaced by a Germanium diode, (V43 2), Tek. No.
152-008, at SN133 0.
Resistors
R3002 X3301-up 27 n
y 2 w Fixed Comp. 10%
R3012 X3301-up 27 n Vi
wFixed Comp. 10%
R3022 101-3300 47 Q Vi
wFixed Comp. 10%
3301-up i o n
Vi wFixed Comp. 10%
R3032 X308-up 27 aVi
wFixed Comp. 10%
R3042 X308-3300 27 a Vl
WFixed Comp. 10%
3301-up 47 a Vi
wFixed Comp. 10%
R3052 X308-up 56 a Vl
WFixed Comp. 10%
R3072 X3301-up 990 k Vl
WFixed Prec.
1 %
R3082 X3301-up 10.1 k Vl
WFixed Prec. 1%
R3102 101-3300X 900 k Vl
WFixed Prec. 1%
R3112 101-3300 111 k Vl
wFixed Prec. 1%
3301-up 900 k Vl
WFixed Prec. 1%
R3122 X3301-up 111 k Vl
wFixed Prec. 1%
R3142 101-3300 990 k Vl
WFixed Prec. 1%
3301-up 27 n Vl
wFixed Comp. 1%
R3152 101-3300X 10.1 k 'A w Fixed Prec. 1%
R3172 101-3300 500 k 'A w Fixed Prec. 1%
3301-up 750 k ’A w Fixed Prec. 1%
R3182 101-3300 1 meq 'A w Fixed Prec. 1%
3301-up 333 k ’A w Fixed Prec. 1%
R3202 101-3300X 750 k ’A w Fixed Prec.
1 %
R3212 101-3300X 333 k Vl
WFixed Prec. 1%
R3232 X3301-up 500 k ’A w Fixed Prec. 1%
R3242 X3301-up 1 meq Vl
wFixed Prec. 1%
R3252 X3301-up 22 Q ’A w Fixed Comp. 10%
R32 2 X3301-up 100 n 'A w Fixed Comp. 10%
R3282 X3301-up 100 k Vl
wFixed Comp. 10%
R3292* X3301-up 1 meq ’A w Fixed Prec. 1%
R3302 X3301-up 39 k 1 w Fixed Comp. 10%
R3312 101-3300X 1 meg ’A w Fixed Prec. 1%
R3322 101 -up 47n ’A w Fixed Comp. 10%
R3332 101-3300X 100 n 2 w Var. Comp. 20%
R3342 101-3300X 15 k 10 w Fixed WW 5%
R3372 101-3300X 1 0 k ’A w Fixed Comp. 5%
R3282 101-3300X 47 a ’A w Fixed Comp. 10%
R3392 101-3300X 180 k ’A w Fixed Comp. 5%
R3402 X3301-up 4k 5 w Fixed WW 5%
R3412 X3301-up 700 a’A w Fixed Prec. 1%
R3452 101- 78 15k 2 w Fixed Prec. 10%
79-up 18k 2 w Fixed Comp. 10%
*R3292 and R4322 are matched within .1 % of each other, furnished as a unit.
®@ PARTS LIST — TYPE B
*10 -022
*10 -037
302-270
302-270
302-470
302-100
302-270
302-270
302-470
302-5 0
309-013
309-034
309-111
309-04
309-111
309-04
309-013
302-270
309-034
309-003
309-010
309-014
309-053
309-010
309-053
309-003
309-014
302-220
302-101
302-104
*312-583
304-393
309-014
302-470
311-003
308-024
301- 1 4
302- 470
301-184
308- 051
309- 083
30 -153
30 -183
3
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Resistors (continued) Tektronix
Part Number
R34 2 101-32 47 Q 'A w Fixed Comp. 10% Part of L34 2
327-3300X 270 n% w Fixed Comp. 5% Part of L34 2
R3472 101-3300X 2.7 k 'Aw Fixed Comp. 5% 301-272
R3502 101-3300 47 C2 'Aw Fixed Comp. 10% 302-470
3301-up 5. k 1 w Fixed Comp. 5% 303-5 2
R3512 101-3300 .8 k 2 w Fixed Comp. 10% 30 - 82
3301-up 780 nVar. W W Use *311-280
R3522 X3301-up 5. k 1 w Fixed Comp. 5% 303-5 2
R3532 X3301 -up k 5 w Fixed W W 5% 308-052
R3542 X3301 -up 10k 2 w Var. W W 20% 311-015
R3552 X33Ql-up 47 a 'Aw Fixed Comp. 10% 302-470
R3582 X3301 -up 700 n 'A w Fixed Prec. 1% 309-083
R3 02 101- 21X 5 0 a 'A w Fixed Comp. 10% 302-5 1
R3 12 101-3300X 330 k 'Aw Fixed Comp. 10% 302-334
R3 22 101-3300X 2 meg 2 w Var. Comp. 20% 311-042
R3 32 101-3300X 22 k 'A w Fixed Comp. 10% 302-223
R3 42 101-3300X 100 k 2 w Var. 10% 311-02
R3 52 101-3300 470 k 'A w Fixed Comp. 10% 302-474
3301-up 8.2 k 1 w Fixed Comp. 10% 304-822
R3 2 101-3300 3.3 k 'A w Fixed Comp. 10% 302-332
3301-up 10k 'A w Fixed Comp. 10% 302-103
R3702 X3301-up 120 k 'A w Fixed Comp. 10% 302-124
R3712 X3301-up 2 x 100 k 2 w Var. Comp. 20% 311-028
R3722 X3301 -up 120 k 'Aw Fixed Comp. 10% 302-124
R3752 X3301-up 120 k 'Aw Fixed Comp. 10% 302-124
R37 2 X3301 -up 2 x 100 k 2 w Var. Comp. 20% 311-051
R3772 X3301-up 120 k 'A w Fixed Comp. 10% 302-124
R3802 X3301-up 3.9 k 2 w Fixed Comp. 10% 30 -392
R3812 X3301 -up 9.1 k 1 w Fixed Comp. 5% 303-912
R3822 X3301-up ioo a'A w Fixed Comp. 10% 302-101
R38 2 X3301-up 9.1 k 1 w Fixed Comp. 5% 303-912
R3872 X3301-up 2k 2 w Var. Comp. 20% 311-008
R3882 X3301-up 9.1 k 1 w Fixed Comp. 5% 303-912
R3902 X3301 -up ioo n 'A w Fixed Comp. 10% 302-101
R3912 X3301-up 9.1 k 1 w Fixed Comp. 5% 303-912
R4002 101-3300X 1 meq 'A w Fixed Prec. 1% 309-014
R4012 101-3300X 100 k 'A w Fixed Comp. 10% 302-104
R4022 101-3300 47 n 'A w Fixed Comp. 10% 302-470
3301-up 22 k 2 w Fixed Comp. 5% 305-223
R4032 3301-3317 5 0 0 'A w Fixed Comp. 10% Use 302-471
3318-13,949 470 n 'A w Fixed Comp. 10% 302-471
13,950-152 9 820 n 'Aw Fixed Comp. 10% 302-821
15270-up 330 n 'A w Fixed Comp. 5% 301-331
R4042 X3301-up 3k 'A w Fixed Comp. 5% 301-302
R4052 101-3300X 18k 'A w Fixed Comp. 10% 302-183
R40 2 101-3300X 1 k 2 w Var. Comp. 20% 311-00
R4072 101-3300X 10k 1 w Fixed Comp. 10% 304-103
R4082 101-3300X k 5 w Fixed W W 5% 308-00
R4092 101-3300X 10k 1 w Fixed Comp. 10% 304-103
4 PARtS LISt — tYPE B
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Resistors (continued) Tektronix
Part Number
R4102 101-3300 200 n 2 w Var. Comp. 20% 311-004
3301-up 1000 y2w Fixed Comp. 10% 302-101
R4112 101-3300X 47 a Vi w Fixed Comp. 10% 302-470
R4122 X3301-3317 220 a Vi w Fixed Comp. 10% Use 302-331
3318-152 9 330 ay2 w Fixed Comp. 10% 302-331
15270-up 470 0 Vi W Fixed Comp. 10% 302-471
R4132 X3301 -up .8 k 2 w Fixed Comp. 10% 30 - 82
R41 2 X3301 -13,949 1.5 k Vi w Fixed Comp. 10% 302-152
13,950-up 1 k Vi w Fixed Comp. 10% 302-102
R4172 X3301-up 2 meg 2 w Var. Comp. 20% 311-042
R4182 X3301-up 330 k Vi w Fixed Comp. 10% 302-334
R4202 101- 78 820 0 Vi WFixed Comp. 5% 301-821
79-up 750 0 Vi WFixed Comp. 5% 301-751
R4252 101-3300 150 k Vi w Fixed Comp. 10% 302-154
3301-up 47 0 Vi WFixed Comp. 10% 302-470
R42 2 101-3300 2 x 100 k 2 w Var. Comp. 20% 311-051
3301-up 150 k Vi w Fixed Comp. 5% 301-154
R4272 101-3300 150 k Vi w Fixed Comp. 10% 302-154
3301-up 120 k y2w Fixed Comp. 5% 301-124
R43Q2 101-3300 150 k Vi W Fixed Comp. 10% 302-154
3301-up 47 0 y2w Fixed Comp. 10% 302-470
R4312 101-3300X 2 x 100 k 2 w Var. Comp. 20% 311-028
R4322 101-3300 150 k y2 w Fixed Comp. 10% 302-154
**3301-up 1 meg y> w Fixed Prec. 1% *312-583
R4352 X3301-up 100O 2 w Var. Comp. 20% 311-003
R43 2 X3301-13359 20 k 8 w Fixed W W 5% 308-081
133 0-up 22 k 2 w Fixed Comp. 10% 30 -223
R4402 101- 78 820 0 y2 w Fixed Comp. 5% 301-821
79-3300 750 0 y. w Fixed Comp. 5% 301-751
3301-up 100 O 2 w Var. Comp. 20% 311-003
R4412 X3301 -up 120 1 w Fixed Comp. 10% 304-120
R4422 X3301-up 4.7 0 1 w Fixed Comp. 10% 307-009
R4502 101-3300X 47 0 y2 w Fixed Comp. 10% 302-470
R4512 101- 21X 5. k 2 w Fixed Comp. 10% 30 -5 2
R4512A 2-3300X .8 k 2 w Fixed Comp. 10% 30 - 82
R4512B X2240-3300X 8 k y2w Fixed Comp. 10% 302- 83
R4522 X3301-up 70 0 5 w Fixed W W 5% 308-078
R4532 X3301-up 39 0 2 w Fixed Comp. 10% 30 -390
R4552 101-3300X 47 0 y2w Fixed Comp. 10% 302-470
R45 2 101- 21 5. k 2 w Fixed Comp. 10% 30 -5 2
R45 2A 22-3300X .8 k 2 w Fixed Comp. 10% 30 - 82
R45 2B X2240-UP 8 k y2w Fixed Comp. 10% 302- 83
R4702 101- 14 3.3 k 1 w Fixed Comp. 10% 304-332
15-3300X 3. k 1 w Fixed Comp. 5% 303-3 2
R4712 101-3300X 100 O y2 w Fixed Comp. 10% 302-101
R4732 101- 21 292 0 10 w Fixed WW 5% 308-057
22-330X 210 0 10 w Fixed WW 5% 308-0 0
**R4322 and R3292 are matched within .1 % of each other, furnished as a unit.
PARTS LIST — TYPE B 5