Tektronix 5441 schematic

WARRANTY

All TEKTRONIX instruments are warranted against defective materials and workmanship for one year. Any questions with respect to the warranty should be taken up with your TEKTRQNIX Field Engineer or representative.

All requests for repairs and replacement parts should be directed to the TEKTRONIX Field Office or representative in your area. This will assure you the fastest possible service. Please include the instrument Type Number or Part Number and Serial Number with all requests for parts or service.

Specifications and price change privileges reserved.

1976

by Tektronix, Inc., Beaverton, Oregon. Printed in the United States of America. All rights reserved. Contents of this publication may not be reproduced in any form without permission of Tektronix, Inc.

U.S.A. U.S.

TEKTRONIX is a registered trademark

and

foreign Tektronix products covered

and

foreign patents and/or patents pending.

Tektronix,

Inc.

TABLE

OF CONTENTS

Page

SECTION 0 INSTALLATION PROCEDURE

SECTION 1 OPERATING INSTRUCTIONS

BASIC OPERATION

Setup Information Calibration Check

Readout Beam Finder External Intensity Input Storage Operation (Variable Persistence) Storage Operation (Without Variable Persistence)

GENERAL OPERATING INFORMATION

Graticule lntensity Control Display Focus Trace Alignment Adjustment Beam Finder Readout (Works Only With 5400-Series Plug-In Units) Option Care of Storage Screen Storage Operation lntensity Modulation Cali brator Display Photography Oscilloscope Applications

Externally Programmed Seventh and Eighth Readout Words

0-1

TABLE

OF CONTENTS

(cont)

SECTION

THEORY OF OPERATION Z-AXIS AMPLIFIER AND CRT CIRCUIT

Z-AXIS AMPLIFIER AND CRT CIRCUIT

2-Axis Amplifier High-Voltage Regulator High-Voltage Outputs CRT Control Circuits

HORIZONTAL AMPLIFIER

Input Amplifier

Output Amplifier

VERTICAL AMPLIFIER

Delay Line Amplifier

STORAGE CIRCUIT

Flood-Gun Filaments Flood-Gun Cathode

Flood-Gun Anode Collimation Electrodes Collector Mesh Storage Mesh

Erase Generator Variable Persistence and Save

(CE)

Page

TABLE

SECTION 3 SERVICE INFORMATION

SPEC1 FlCATlONS

Table 3-1 -5403-D41 Vertical Amplifier Table 3-2 -5403-D41 Horizontal Amplifier Table 3-3 -D41 2-Axis Amplifier Table 3-4 -D41 Cathode-Ray Tube Table 3-5 -5403-D41 Power Supply and Calibrator Table

3-6

-5403-D41 Readout Table 3-7 -D41 Miscellaneous Table 3-8 -5403-041 Environmental Table 3-9 -5403-D41 Physical Electrical Parts List Controls and Connectors, and Symbols Adjustment Operational Checks (Back Side of Foldout) Block Diagram Vert Parts Location Grid and Adjustments (Back Side of F

old out)

CONTENTS

(cont)

Page

Vertical Amplifier Horiz Parts Location Grid and Adjustments (Back Side of Foldout) Horizontal Amplifiers High-Voltage Parts Location Grid and Adjustments (Back Side of Foldout) 2-Axis Amplifier & CRT Circuit

Storage Parts Location Grid and Adjustments (Back Side of Foldout) Storage Circuit

Interconnect and Voltage Distribution Diagram

Mechanical Parts List

Fig. 1 Exploded View

Accessories

REV.

MAR.

1977

INSTALLATIO PROCEDURE

Before you start

Check the power supplylamplifier module rear panel markings. If the factory settings are compatible with the available

line voltage and frequency, insert the desired plug-ins. Use the bail to raise the front of the instrument.

...g

o to Operating Instructions...

If a change is needed, follow these steps:

Fig.

instrumen

aged

Line

220

Selr

nominal

line

with

voltage.

0-1.

Illustration showing a portion of power supply/amplifier module's

L.V.

power supply circuit board.

a. Line Selector Block(s)

Remove the Scope-Mobile retainer blocks and their screws, then remove the bottom dust cover from the power supply/amplifier module by turning the four slotted fasteners a quarter turn counterclockwise. This gives easy access to the Line Selector blocks located on the LV power supply circuit board.

Reaulating Ranges for Power Transformer

Line

Selector

Block

Position

Line Fuse

Data

Line Range Taps

120 Volts Nominal

1.25 A slow-blow

Regulating Ranges

220 Volts Nominal

0.7

slow-blow

Fig.

0-2.

Rear Panel

Replace the bottom dust cover and the two Scope-Mobile retainer blocks on the power supply/amplifier module.

If necessary, change the line cord power plug to match the power source receptacle or use an adapter.

L.V. power supply circuit board.

Primary taps area of power supplylarnplifier module's

Plug the cord into the power source.

Insert the desired plug-ins.

Use the bail to raise the front of the instrument.

Fig.

0-3.

module.

View showing rear-panel of power supplylamplifier

Operating

Instructions..

0-2

Operating I nstructions-D41

Position controls so that the display and starts at the left edge of the graticule.

Adjust the FOCUS control for a sharp, well-defined

display over the entire trace length.

Disconnect the input signal and position the trace vertically so that of the graticule.

If the trace

ine, see Trace Alignment Adjustment in this section.

10. Rotate the GRAT range and notice that the graticule lines are illuminated as the control lines are illuminated as desired.

coincides with the center horizontal line

not parallel with the center horizontal

LLUM control throughout its

turned clockwise. Set control so graticule

centered vertically

Calibration Check

11. Move the trace two divisions below graticule center and reconnect the calibrator signal to the amplifier plug-in input connector.

12. The display should be four divisions in amplitude

with six complete cycles (five complete cycles for 50-hertz

line frequency) shown horizontally. An incorrect display indicates that the oscilloscope mainframe or plug-ins need

to be recalibrated.

Readout

13. Turn the READOUT INTENS control clockwise until an alpha-numeric display is visible within the top or bottom division of the CRT (reset the FOCUS adjustment if necessary for best definition of the readout). Change the VoltsIDiv switch of the amplifier plug-in that is selected for display. Notice that the readout portion of the display

changes as the deflection factor change the Sec/Div switch of the time-base unit that selected for display. Notice that the readout display for the time-base unit changes also as the sweep rate

14. Set the time-base unit for magnified operation. Notice that the readout display changes to indicate the correct magnified sweep rate. If a readout-coded 1 OX probe

available for use with the vertical unit, install it on the

input connector of the vertical plug-in. Notice that the

deflection factor indicated by the readout

10 times when the probe is added. Return the time-base unit to normal sweep operation and disconnect the probe.

changed. Likewise,

changed.

increased by

15. Notice that the readout for a particular plug-in occupies the vertical plug-in units readout for channel the CRT below the readout for channel 1.

specific location on the display area. If either of

a dual-trace unit, notice that the

appears within the lower division of

Beam Finder

16. Move the display off-screen with the vertical position control.

17. Push the BEAM FINDER button and observe that the

display

display to screen center and release the BEAM FINDER button.

compresses

into

the

screen

area.

External Intensity Input

18.

Connect a 5 volt, 1 kHz sine-wave or square-wave signal to the EXT INTENSITY INPUT connector on rear panel of D41. Also, use the signal to externally trigger the time-base plug-in.

19. Slowly rotate the INTENSITY control counterclockwise until the trace appears to be a series of dimmed and brightened segments. The brightened segments correspond with the tops of the square waves.

Storage Operation (Variable Persistence)

20. Disconnect the 5 volt, 1 kHz sine-wave or square-

wave signal from the EXT INTENSITY INPUT connector.

Reset the time-base plug-in triggering controls for an internally-triggered display from the vertical plug-in.

21. After making sure the calibrator signal

connected to the amplifier plug-in input connector, set the controls on the time-base plug-in for single-sweep operation. Press the STORE button and note that the CRT will momentarily be flooded positive (becoming quite bright).

22. Press the Reset button on the time-base plug-in. One

sweep will be generated, and a display should be visible, but

will fade out within a few seconds. lncrease the VARI-

ABLE PERSIST control setting if retention

to increase the background level for viewing lightly written

information. If there is no display visible, increase the

INTENSITY control setting and press the Reset button.

positive and erase. Press the Reset button on the time-base plug-in to obtain another stored display on the CRT. Press

required. lncrease the WRITING SPEED setting

23. Press the ERASE button; the CRT should turn

display of longer

Reposition

the

still

Operating I nstructions-D41

the SAVE button; the display is stored and no other sweep or change in position will affect the display. The SAVE button, when pushed, locks out the sweep erase circuit and cuts off the current to the flood gun cathode as long as the VARIABLE PERSIST control

(display stored at the maximum time). Turning the PERSIST (Save Time) control counterclockwise will decrease the time a stored display When the display is not being used, turn the PERSIST (Save Time) control fully clockwise; the display will not be visible on the screen, destroyed. Turn the PE RSlST (Save Time) control counterclockwise until instrument Time) control turned off without losing any stored information. Turn the instrument on again and turn the PERSIST (Save Time) control counterclockwise until display appears.

The

ence control are combined into one control. If the

PERSIST (Save Time) control has been adjusted to

view the display in the 'Save' mode and the then taken out of the 'Save' mode, the display will fade rapidly, since the persistence is now set for a

shorter time.

but the information has not been lost or

display

in the "SAVE" mode and the PERSIST (Save

fully clockwise, the instrument can be

Save Time control and the Variable Persist-

turned fully clockwise

retained on the CRT.

visible when needed. When the

NOTE

047

Storage Operation (Without Variable Persistence)

24. Rotate the VARIABLE PERSIST control to

fully counterclockwise position and release the SAVE

its

button to

25. Press the Reset button on the time-base plug-in. One sweep will be generated, and a display should be visible. Increase the WRITING SPEED setting if a brighter display is

required. If there

INTENSITY control setting and press the Reset button.

26. Press the ERASE button and note that the stored waveform pressing the Reset button on the time-base plug-in.

27.

to the point where the stored readout information doesn't spread.

This completes the description of the basic operating procedure for the D4l. Instrument operations not explained here, or operations that need further explanation are discussed under General Operating Information.

off (button out) position.

no display visible, increase the

erased. Another display can be stored by

Turn READOUT I NTENS control slowly clockwise

its

GENERAL OPERATING INFORMATION

Graticule

The graticule of the D41 faceplate of the CRT to provide accurate, parallax-free measurements. The graticule and ten horizontal divisions. Each division

0.9

cm. In addition, each major division minor divisions. The vertical gain and horizontal timing are calibrated to the graticule so that accurate measurements can be made from the graticule. The illumination of the graticule lines can be varied with the GRAT ILLUM control.

Intensity Control

The intensity of the display on the CRT the INTENSITY control. This control display probably require readjustment for different displays or sweep rates. Particular care should be exercised when only spot phosphor and cause permanent damage to the CRT if allowed to remain too long.

easily visible but not overly bright.

displayed. A high-intensity spot may burn the CRT

internally marked on the

marked with eight vertical

0.9

divided into five

controlled by

adjusted so the

cm by

will

Display Focus

If a well-defined display cannot be obtained with the FOCUS control, even of the internal astigmatism control may be required.

To check for proper setting of the Astig control, slowly turn the FOCUS control through the optimum setting with a signal displayed on the CRT screen. If the Astig control correctly

trace will come into sharpest focus the FOCUS control.

set,

the vertical and horizontal portions of the

low intensity settings, adjustment

the same position of

Trace Alignment Adjustment

If a free-running trace

graticule lines,

adjustment) as follows: Position the trace to the center horizontal line and adjust the Trace Rotation adjustment so that the trace

set

parallel with the horizontal graticule lines.

not parallel with the horizontal

the Trace Rotation adjustment (internal

Operating I nstructions-D41

Beam Finder

The BEAM FINDER switch provides a means of locating

a display that overscans the viewing area either vertically or

horizontally. When the BEAM FINDER switch the display display intensity overscanned display, use the following procedure:

increase the vertical and horizontal deflection factors until the display

2. Adjust the vertical and horizontal position controls to center the display about the vertical and horizontal centerlines.

3. Release the BEAM FINDER switch; the display should remain within the viewing area.

compressed within the graticule area and the

increased. To locate and reposition an

Press the BEAM FINDER switch, hold

within the graticule area.

pressed,

in, then

Readout (Works Only With 5400-Series Plug-In Units)

The readout system of the power supply/amplifier and display modules allows alpha-numeric display of information on the CRT, along with the analog waveform displays. The information displayed by the readout system

obtained from the plug-in units that are installed in the plug-in compartments. The characters of the readout display are written by the CRT beam on a time-shared basis with the signal waveforms.

The READOUT

sity of only the readout portion of the display independent

of the other traces. The readout system fully counterclockwise OFF position. This may be desirable when the top and bottom divisions of the graticule are to

be used for waveform display, or when the trace inter-

ruptions necessary to display characters do not allow a satisfactory waveform display to be obtained.

Option

NTENS control determines the inten-

inoperative in the

Externally Programmed Seventh and

Eighth Readout Words

This option adds a 25-pin connector to the rear panel of

the display module, through which two ten-character

readout words can be displayed on the CRT,

see

Fig.

1-1.

Care of Storage Screen

The following precautions will prolong the useful storage

life of the CRT screen used in this instrument.

Use the minimum beam intensity required to produce a clear, well-defined display. A too-high beam intensity may permanently damage the CRT screen, particularly if a

bright spot area.

allowed to remain stationary on the display

Left Right

Vertical

Channel 1 Channel

Vertical

Horizontal Horizontal

Main B or Delayed

The Readout System operates in

interrupt the waveform display to present characters. The

waveform display seconds for each character that

The readout information from each plug-in

word. Up to six (eight with option

information can be displayed on the display module (a

seventh and eighth word are available when option 3 is

installed). The location at which each readout word

presented and channel from which area of the graticule where the readout from each plug-in

unit channel available only with option 3). Notice that the readout from channel division of the graticule and the readout from channel 2 displayed directly below within the bottom division of the graticule. Only the readout from plug-in channels that are selected by display switches, or by the mode switches of dual-channel plug-ins, appears in the readout display.

fixed and

of each plug-in unit

interrupted for only about 20 micro-

directly related to the plug-in unit

originated. Fig.

displayed (external readout programming

free-running mode to

displayed.

called a

words of readout

1-1

shows the

displayed within the top

Left Right External External

Vertical Vertical Word Word

Channel 2 Channel 2 (Channel) 1 (Channel)

External readout

information when

option is installed.

Fig.

1-1.

plug-in unit and channel (and external, if Option

Location of readout on the crt identifying the originating

is installed).

Avoid repeated use of the same area of the screen. If

particular display vertical position occasionally to use other portions of the display area.

being stored repeatedly, change the

Operating

obtained by applying signals between these levels. Maximum safe input voltage range of the Z-Axis circuit

or -50 volts. Usable frequency

DC to two megahertz.

Instructions-D41

Do not leave a stored display on the screen when

no longer needed.

4. Operate the instrument in the non-store mode unless

storage

required.

Storage Operation

The storage feature greatly increases the versatility of the 5403-D41 Oscilloscope. The storage cathode-ray tube allows a display to be retained for a longer period of time. When the STORE button a conventional oscilloscope.

When the STORE button operates in a storage mode. Two modes of storage are available. They are Variable Persistence, where the persistence of the CRT control; and a SAVE mode, that allows longer retention of the displayed information. When the SAVE button pressed in, a lockout function prevents accidental erasure of the stored display.

A stored display In the SAVE mode, the erase function is disabled.

out, the instrument operates

pressed in, the instrument

electrically controlled by the PERSIST

erased by pressing the ERASE switch.

Time markers applied to the EXT INTENSITY INPUT provide a direct time reference on the display. With uncalibrated horizontal sweep or X-Y operation, the time markers provide a means of reading time directly from the display. However, if the markers are not time-related to the displayed waveform, a single-sweep display should be used (for internal sweep only) to provide a stable display.

Cali brator

The internal calibrator of the D41 provides a convenient

signal source for checking basic vertical gain and sweep

timing. The calibrator signal probe compensation, as described in the probe instruction manual. The output square-wave voltage within within 1%. The frequency of the square-wave signal the power-line frequency. The signal the probe to the loop.

I%,

and the square-wave current

also very useful for adjusting

obtained by clipping

Display Photography

A permanent record of the CRT display can be obtained

with an oscilloscope camera system. The CRT bezel of the

D41 provides integral mounting for a Tektronix oscilloscope camera. The instruction manuals for the Tektronix oscilloscope cameras include complete instructions for obtaining waveform photographs.

400 millivolts,

4 milliamperes,

twice

lntensity Modulation

Intensity (Z-Axis) modulation can be used to relate a third item of electrical phenomena to the vertical (Y-Axis) and the horizontal (X-Axis) coordinates without affecting the waveshape of the displayed signal. The Z-Axis modu-

lating signal, applied to the EXT INTENSITY INPUT, changes the intensity of the displayed waveform to provide this type of display. The voltage amplitude required for visible trace modulation depends on the setting of the

INTENSITY control. About +5volts will turn on the display to a normal brightness level from an off level, and about -5 volts will turn the display off from a normal

brightness level. "Gray scale" intensity modulation can be

Oscilloscope Applications

The 5400-series oscilloscope, including display module and plug-in units, provides measurement system. Specific applications for the individual plug-ins are described in the manuals for those units.

Refer to the Operating Instructions section of the 5403 instruction manual for basic oscilloscope applications, including peak-to-peak AC voltage measurements, instan-

taneous DC voltage measurements, comparison measure-

ments, time duration measurements, determining

frequency, risetime measurements, and phase-difference

measurements.

its

associated

very flexible

Theory of Operation-D41

in a DC level across R422 equal to the peak-to-peak R370. In order to obtain optimum spot size and shape,

excursion at the anode of CR430.

both the FOCUS and Astig controls are adjusted to provide

the proper electrostatic lens configuration in the CRT.

CRT Control Circuits

In addition to the INTENSITY control discussed The Geom adjustment R365 varies the positive level on previously, front-panel FOCUS and internal astigmatism the horizontal deflection plate shields to control the overall controls have been incorporated for arriving

CRT display. FOCUS control R440 provides the correct permits adjustment of the DC current through

voltage for the second anode in the CRT. Proper voltage for beam-rotation coil L375

the third anode

obtained by adjusting Astig control horizontal graticule lines.

an optimum geometry of the display. The trace rotation control, R375,

to align the display with the

HORIZONTAL AMPLIFIER

The horizontal amplifier amplifies the push-pull horizontal deflection signal from the interface circuit board and applies CRT.

to the horizontal deflection plates of the

lnput Amplifier

The horizontal signal from the interface circuit board

connected to the bases of 0200 and 021 5. Under no-signal conditions, the bases of 0200 and 021 5 are within 150 mV

of ground. Resistive network between the emitters of 0200 and 0215, controls the

emitter degeneration of this stage. R212 provides of adjusting the emitter degeneration of the input amplifier and thereby controls the gain of the horizontal amplifier, within +lo%.

To compress an off-screen display so that viewed on the CRJ, the BEAM FINDER reduces the dynamic range of the input amplifier. This is done by disconnecting CR208 in the emitter circuitry of

0200-021 5, and supplying

current setting resistors R205, R208, and R213.

Resistors R202 and R217 provide thermal compensation for the input amplifier, while R222 provides correcting for differential unbalance in the amplifier or CRT.

R205-R207-R210-R212-R213,

means

may be

reduced current through

means of

Output Amplifier

Transistors 0240-0244-0250 and 0270-0274-0280 are

connected amplifiers. lnput transistor 0240 (in the left output amplifier) is positive-going right output

negative-goi

Negative feedback output transistors 0244-0250-0274-0280 to the base of input transistors 0240 and 0270 through feedback networks C242-R242 and C272-R272. Variable capacitors C242 and C272 adjust the transient response of the

feedback networks to provide good linearity at fast sweep

rates. The Zener diode-fast switching series diode, CR242-VR240 and CR272-VR270 (across each of the

feedback networks in the output amplifier), turn on when the sweep passes the right edge of the CRT. This action stops the collectors of the output transistors and shunts out the feedback networks, thus current limiting the output amplifier. Capacitors C240, C250, and C280 are speed-up capacitors to improve the amplifier response to fast changes. Diodes CR246 and CR274 prevent 0244 and 0274 from going into saturation.

two separate current-driven feedback

an NPN transistor for better response to signals, while input transistor 0270 (in the amplifier) signal response.

a PNP transistor for better

provided from the collectors of

VERTICAL AMPLIFIER

The vertical amplifier provides the final amplification for the vertical signal before deflection plates of the CRT. The vertical amplifier circuitry includes the delay line and part of the beam finder circuit, which reduces the final drive to compress an over-scanned display to within the viewing area of the

is applied to the vertical

CRT.

Delay Line

Delay line DL100 provides approximately 140 ns of delay for the vertical signal. This allows the time-base circuits time to initiate a sweep before the vertical signal

reaches the CRT deflection plates. This delay of the vertical signal allows the leading edge of the signal originating the trigger pulse to be displayed when using internal triggering.

Theory

Operation-D41

The delay line has a characteristic input impedance of

about 75 ohms, or about 150 ohms from side-to-side.

Amplifier

The vertical amplifier consists of a high bandpass three-stage paraphase amplifier having an input sensitivity of approximately 35 mV/division and a voltage gain of about 11 5. The amplifier of 0100 and 0125 by the input signal from the delay line.

Rl00 and R 125 terminate the delay line.

The first amplifier stage consists of 01 00, Q106, Q125, and 0130. The gain of this stage of the feedback resistors R 104-R 103 or R 128-R 129 and the emitter resistor R 11 1. The networks parallel to the emitter delay line. R135 compensates for resistive tolerance errors and CRT electrical center error in the vertical amplifier, and allows the mainframe input to be standardized.

resistor compensates for the signal losses in the

acts

differentially driven

determined by the ratio

centering control, which

the bases

STORAGE CIRCUIT

The next stage of amplification consists of 0148, 0170, Q165, and Q172. Thermistor RTI 57 resistor R 157 varicap CR146 and capacitor C160 between the emitters of 0148 and 0165 comprise a thermal compensation network to correct for frequency loss with temperature changes. The two RC networks (R 151 -Cl56 and the emitters of 0148 and 0165, and the RCL network in the collectors of 0148 and Q165 provide high frequency compensation.

The final amplifier stage consists of Q180, 0188, 0182, and 0190. R 175 provides a means of adjusting the vertical amplifier gain within a 220% range.

Pushing the BEAM Fl NDER compresses an off-screen display to determine turning off Q140, when the BEAM FINDER which reduces the standing current in the second amplifier stage. This lowers the voltage drop across which lowers the standing current in the final amplifier stage. The lower final amp1 ifier stage standing current reduces the possible scan on the CRT.

its

location. This

l55-Cl53-Cl55) in

accomplished by

pushed,

172 and R 176,

The cathode-ray tube tube. The collector mesh is a coarse mesh, which accelerates electrons toward the target area. The target (storage mesh)

a fine mesh with a highly insulative dielectric layer deposited on it. occurs. The flood guns cover the entire storage target with continuous stream of low velocity electrons; these electrons are prevented from reaching the phosphor screen unless a display has been written on the storage mesh.

The collimation bands (electrodes) are used which uniformly distributes flood-gun electrons over the

storage target area. In the non-store mode, the collimation control fully clockwise), or if the PERSIST control

bands have no control over the CRT.

Switching from the non-store mode to the store mode done by pushing in the STORE pushbutton. When changing

modes from non-storage to storage operation, an erase cycle

generated automatically.

Flood-Gun Filaments

The flood-gun filament supply for the CRT consists of VR690-VR691 and emitter follower 0690. The power to heat the filaments is derived from the VR690-VR691 sets the base voltage of 0690 and provides regulation.

transmission halftone storage

in the dielectric layer that storage

-20

V power supply.

a lens

Flood-Gun Cathode

The flood-gun cathode switching transistors 0675, 0680 and 0685. Two signals control whether the flood-gun cathode are:

a. The STORE switch pushed in signal turns on the flood-gun cathode.

b. The SAVE pushbutton, S675, when depressed either

the

flOOd-gun

turned away from its fully clockwise position, allows the flood-gun cathode to be pulsed

When the D41 power microsecond 0700 turns off. This eliminates the negative voltage that would result from the slow decay of the power supply filter capacitors, leaving only the positive voltage present at the base of 0675. 0675 0680 and 0685 to be off. This prevents damage to any stored information if the save mode is being utilized, since there is not any flood-gun cathode current available.

switched either on or off by

turned on; they

a low duty factor.

turned off, in less than

turned on causing

Flood-Gun Anode

The flood-gun anode circuit consists of operational amplifier 0670-0672. The operational amplifier is used

(PERSIST

Theory of Operation-D41

current-to-voltage conversion amplifier. A composite erase pulse is supplied to the base of 0670 to hold the flood-gun anode high during the erase cycle.

Collimation Electrodes (CE)

The CE 1 and 2, and the CE 3 circuits consist of an emitter follower, 0655 and 0600, with base-emitter reverse voltage protection furnished by CR655 or CR600. R655, CE 1 and R600, CE 3 adjustments control the voltage level of the CE 1 and 2, and voltage varies between store and non-store modes of operation. R655, CE 1 adjustment sets the CE 1 and 2 level in the store mode, while R654 and and CE 2 level in the non-store mode. R655-R657 divider allowed to float in the non-store mode.

3 respectively. CE 1 and 2

VR655 sets the CE 1

Collector Mesh

Emitter follower 0595, base-emitter reverse voltage protection diode CR595 and Zener diode VR595 make up the collector mesh circuitry. VR595 for 0595.

sets

the base voltage

Storage Mesh

0580, 0575 and Q585 form an operational amplifier

that

Internal adjustments, R572, Prep Level, and R590, Op

Level, set the quiescent operating levels for the CRT in the storage mode. R585, WRITING SPEED control, allows a small adjustment to be made in the operate, level, which increases the CRT's ability to store a fast waveform. During

the erase cycle the storage mesh is made a high positive for

50 ms, returned to its operate level for 10 ms, then made slightly positive level for 440 ms. The two positive-going erase signals (see Fig. 2-1) are supplied to the storage mesh by the collectors of 0515 (50 ms) and 0555 (440 ms).

used as a current-to-voltage conversion amplifier.

Erase Generator

Pushing the ERASE pushbutton creates a negative pulse at the base of Q510. R665-R500-C500 remover network for the ERASE pushbutton with R500 used to dampen any ringing. 0510 and 0515 form monostable multivibrator; C514 and R507 are the timing components. Coupling capacitor C528 couples the 50 ms multivibrator to the input of the I0 ms monostable multivibrator consisting of 0530-0535. The timing components for 0530-0535 are C534 and R530. The output from the 10 ms multivibrator input of the 440 ms monostable multivibrator by C538. 0550-0555, along with timing components C554 and R545 form the 440 ms monostable multivibrator. The

monostable multivibrators are cascaded to provide sequential pulse train. Diodes CR560, CR562 and CR564 make up an OR gate to supply a composite erase signal to

the flood-gun anode circuit.

The signal available from the collector of 0550 is used

to retrigger the erase generator when the ERASE

pushbutton

held depressed.

a contact bounce

coupled to the

Variable Persistence and Save

0625 and 0640 form a monostable multivibrator that triggered by the output of the 10 ms pulse generator consisting of programmable unijunction transistor 0610. The timing components for the monostable multivibrator are C625, R622 and R620 PERSIST control. The 10 ms pulse generator timing components are C610, R608 and

R609. 0635 acts as a switch for R620 PERSIST control.

When S610 STORE pushbutton is pushed in, the 10 ms pulse generator feeds pulses to the storage mesh to increase the background level slightly for better storage and to the Q625-0640 monostable multivibrator for triggering.

50 ms

This level controlled by R590

Level

This distance set by R572 Prep Level and is not affected by R590 Op Level adjustments

R585A WRITING SPEED control changes

distance Dreo level is above 0

remains constant.

Fig. 2-1. Erase cycle waveform as seen at the storage mesh-connection to the crt.

Prep Level

level, but

Q~~~~o~~e~~o~~]

Signal from

0535 collector

Signal from

0555 collector

440 ms

S675 SAVE

pushbutton

position), then the output of

CR640

to the storage mesh. a sweep.

Q640

When

output of

not pushed in (out cathode. Pushing

pins

(Fig. 2-2)

supplied via

16A

S675 SAVE

0640

(Fig. 2-2)

S675

and

17A

of the time-base plug-in high, preventing

Theory

Operation-D41

pushbutton is pushed in, then the

supplied to the flood-gun

in forward-biases

CR650

and holds

Fig.

Variable from to

control

2-2.

Variable Persistence

ms by varying

ms-

and

Save circuit output waveform.

I I

Service Information-D41

TABLE 3-3

D41 2-Axis Amplifier

Characteristics

External lnput

lnput Voltage

Usable Frequency Range

lnput l mpedance

Maximum Safe lnput

Characteristics

Geometry

Orthogonality

Stored Writing Rate

Performance Requirements

+5 V turns CRT beam on from off condition

-5

V turns CRT beam off from on con-

dition

DCto 2 MHz

Resistance: 10 Capacitance: 40 pF

Bowing or tilt < 0.1 division

5 divlps

1 divlps at 60 second viewing time

ki-2

TABLE 3-4

D41 Cathode-Ray Tube

Performance Requirements

15 second viewing time

Supplemental Information

Phosphor

Deflection

Acceleration Potential

Characteristics

Power Line Input

Line Voltage (RMS)

Line Frequency

Input Power

Fuse Data

Cali brator

Voltage

Current

P31 standard Electrostatic

8.5

TABLE 3-5

5403-D41 Power Supply and Calibrator

Performance Requirements

Nominal IOOV, llOV, 120". 200V.

50to400Hz

100

maximum at 120 VAC, 60

slow blow (1 20 VAC)

1.25

0.7 A slow blow (240 VAC)

4mAf21%

Supplemental Information

I I

Frequency

Twice the power line frequency

REV.

MAR.

1977

Service Information-D41

Intensity Range

Characteristics

Graticule

Scale

Scale Color and Type

Normal

TABLE

5403-D41

Performance Requirements

TABLE

D41

Miscellaneous

Performance Requirements

10 divisions with 0.9 cmldiv

3-6

Readout

3-7

Supplemental Information

Off to full brightness. Readout inoperative when READOUT fully counterclockwise in detent position.

Top words are displayed in top major graticule division between left and right extreme graticule lines. Bottom words are displayed in bottom major graticule division between left and right: extreme graticule lines.

Supplemental Information

l NTENS

Beam Finder

Characteristics

Temperature

Operating

Storage

Altitude

Operating

Storage

Vibration

Operati Operati

ng and Nonn g

Brings trace within viewing area and in-

tensifies trace

TABLE 3-8

5403-D4 1

Performance Requirements

To 15,000 feet

50,000 feet

With the instrument complete and operating, vibration frequency swept from 10 to 50 to

1 minute per sweep. Vibrate 15

minutes in each of the three major axes

0.015" total displacement. Hold 3 minutes

any major resonance, or if none,

Total time. 54 minutes

Environmental

50 Hz.

Supplemental lnformation

REV.

JULY

1974

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