Tektronix 7613 User manual

TEKTROND©
7613/R7613
STORAGE
OSCILLOSCOPE
SERVICE
INSTRUCTION MANUAL

BEFORE
READING
PLEASE
CHECK
FOR
CHANGE
INFORMATION
AT
THE
REAR
OF
THIS
MANUAL.
Tektronix, Inc.
070- 1463-00
THIS MANUAL REPRINTED OCT 1974
TEKTRONIX
7B613/R7613
STORAGE
OSCILLOSCOPE
SERVICE
INSTRUCTION MANUAL
P.O. Box 500 Beaverton, Oregon 97005
972
7613

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 TEKTRONIX Field Engineer or representative.
All requests for repairs and replacement parts should be
directed to the TEKTRONIX Field Office or representative
in your . 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.
Copyright © 1972 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. and foreign TEKTRONIX products covered by U.S.
and foreign patents and/or patents pending.
TEKTRONIX is a registered trademark of Tektronix, Inc.
7613

SECTION 1
SECTION 2
SECTION 3
SECTION 4
SECTION 5
SECTION 6
SECTION 7
TABLE OF CONTENTS
OPERATING INFORMATION
Controls And Connectors
CALIBRATION
Test Equipment Required
Index to Calibration Procedure
CIRCUIT DESCRIPTION
Block Diagram of 7613
Basic Storage Block Diagram
MAINTENANCE
Preventive Maintenance
Circuit Board Locator
Troubleshooting Chart
Corrective Maintenance
ELECTRICAL PARTS LIST
DIAGRAMS
MECHANICAL PARTS LIST
7613/R7613 Service
Page
1-1
2-2, 2-3
2-4
3-1
3-2
3-50
4-1
4-4, 4-5
49
4-10
7613

The TEKTRONIX 7613 Storage Oscilloscope is a solid-state, light-weight instrument designed for general purpose
applications. This instrument has three plug-in compartments that accept TEKTRONIX 7000-Series plug-in units to
form a complete measurement system. The two plug-in compartments on the left are for vertical preamplifiers. The
right plug-in compartment is connected to the horizontal deflection system. Electronic switching is used to connect
either vertical plug-in to the vertical deflection system. It is possible to alternately display the vertical signals
(multi-trace display). The flexibility of this plug-in feature and variety of plug-in units available allow this system to be
used for many measurement applications.
This instrument features a large screen, 8 X 10 division display; each division equals 0.9 centimeter. The Cathode ray
tube (CRT) provides small spot size and a fast storage writing speed. Storage operation uses a variable Persistence mode
and a Save mode. The variable Persistence mode electrically controls the retention of the CRT. The Save mode provides
longer retention of the stored display, and a lockout function to prevent accidental erasure of the stored display.
7613/R7613
7613

Section 1—7613/R7613 Service
OPERATING
INFORMATION
The 7613/R7613 can be operated from either a 110-volt
or a 220-volt line source. In addition, three operating ranges
can be selected by a jumper located on the Rectifier board.
Select a range which is centered about the average line volt-
age to which the instrument is connected.
See Table 1-1 for ranges and proper fuses.
TABLE 1-1
Regulating Range and Fuse Data
Pins Regulating Range
Selected 110-volt nominal 220-volt nominal
LOW 90 to 110 volts 180 to 220 volts
MED 99 to 121 volts 198 to 242 volts
HI 108 to 132 volts 218 to 262 volts
Line fuse 3.2 A slow-blow 1.6 A slow-blow
The 7613 can be operated where the ambient air
temperature is between 0° and +50°C. The instrument is
cooled by forced air. Adequate clearance must be provided
on back and bottom of the instrument. The R7613 is
cooled by forced air. Adequate clearance must be provided
behind the air filter and on the right side. A thermal cutout
in the instrument provides thermal protection by
interrupting the power to the instrument if the internal
temperature exceeds a safe operating level.
OPERATING SET-UP INFORMATION
INTENSITY Midrange
READOUT Midrange
FOCUS Well defined display
STORED INTENSITY Midrange
PERSISTENCE Midrange
SAVE TIME Clockwise
STORE Out (release)
SAVE Out (release)
NON-STORE In (pressed in)
VERT MODE LEFT (pressed in)
TRIG SOURCE VERT MODE
GRATICULE ILLUM As desired
POWER On {pulled out)
Display Modes
Install two vertical plug-in units into the vertical com-
partments. Set the deflection factor for two volts/division.
Connect the 4 V calibrator signal to both vertical plug-in
units. Use a pin jack to BNC connector and a dual input
coupler connector. [Install a time-base plug-in unit in the
horizontal compartment. Set the time/division switch to
0.5 millisecond/division, and adjust the trigger level for a
stable display. The left vertical signal is displayed.
Press the RIGHT button of the VERT MODE switch.
The display should be stable for either vertical unit
selected.
Press the ALT button of the VERT MODE switch.
Adjust the position controls of each vertical unit so that
two displays are present on the CRT screen. One vertical
signal is displayed per sweep and the other vertical signal is
displayed at the next sweep. This is a dual trace mode.
Press the CHOP button of the VERT MODE switch. A
dua! trace will be displayed on the CRT screen, Each verti-
cal signal is displayed during the sweep, on a time-sharing
basis.
Press the ADD button of the VERT MODE switch. The
display is the algebraic sum of both vertical signals.
Stored Displays
Obtain a display by following the instructions under
OPERATING SET-UP INFORMATION and Display Modes.
Press the STORE button, the instrument is in the vari-
able persistence mode. Change the vertical position, and
note that the stored display will fade out and the new
Position will be stored. The time that a display is stored on
the screen of the CRT is controlled by the PERSISTENCE
contro! (clockwise decreases the retention).
Press the SAVE button. All functions are locked out
except the SAVE TIME control and the STORED INTEN-
SITY control. The STORED INTENSITY controls the
brightness of the stored display. The SAVE TIME controls
the length of time that a display is stored. When the SAVE
TIME control is at MAX and in the switch detent (mini-
mum intensity) the display is not visible. Turning the SAVE
TIME control clockwise will make the stored display
visible, but will reduce the storage time. While in the MAX
save mode, the stored information will remain stored for
long periods of time even with the power turned off. Turn
the instrument on, and adjust the SAVE TIME control
setting for a visible display.
Care of Storage Screen
1. Use minimum beam intensity to produce a clear well
defined display.
2. Avoid repeated use of the same area of the CRT.
3. Do not leave a stored display on the screen when it is
no longer needed.
4, Use MAX SAVE when storing a display for extended
periods of time (minimum intensity).
5. Operate in the NON-STORE mode unless storage is
required.
BEAM FINDER
The BEAM FINDER switch provides a means of locating
a display which overscans the viewing area.
Press and hold the BEAM FINDER switch in. Increase
the vertical and horizontal deflection factors until the
display is reduced to about two divisions, and adjust the
horizontal and vertical position contro! settings to center
the display. Release the switch for normal operation.
For more detailed operating instructions see the 7613/
R7613 Operators Manual.
1-1
7613

Operating Information—7613/R7613 Service
FUNCTIONS OF CONTROLS AND CONNECTORS
FRONT PANEL
. INTENSITY—Controls brightness of the
display. Control is inoperative when hori-
zontal compartment vacant.
2. READOUT—Turns on the readout display
and controls the readout intensity.
3, FOCUS-Provides adjustment for optimum
display definition.
4, GRATICULE ILLUM-—Controls graticule
illumination.
5. BEAM FINDER—When pressed, the display
is limited within the graticule area.
2
. TRIG SOURCE-Selects source of internal
trigger signal for the time base plug-in in
the horizontal compartment.
LEFT: The trigger signal is obtained from the plug-in unit in
the left vertical compartment only.
VERT MODE: Trigger signal automatically follows the
vertical display except in CHOP and ADD; then the trigger
signal is the algebraic sum of the signals from the left and
right vertical compartments.
RIGHT: The trigger signal is obtained from the plug-in unit
in the right vertical compartment only.
ee gh 2
a! (4)
vertical compartments are algebraically added and the sum is
displayed on the CRT.
CHOP: Signals from plug-in units in both the left and right
vertical compartments are displayed (dual trace). The display
is switched between vertical plug-in units at approximately a
one megahertz rate.
RIGHT: Signals from plug-in unit in right vertical compart-
ment is displayed.
NON-STORE —Selects non-store operation.
STORE-Selects storage operation.
PERSISTENCE—Controls the retention of the stored display.
SAVE-—Prevents accidental erasure or additional storage of
information.
SAVE TIME—Used with the SAVE mode for extending re-
tention. When in the MAX detent there is no visible stored dis-
play in all storage modes.
STORED INTENSITY—Selects stored writing speed and view
time combination (controls brightness of stored display).
Camera Power (Not Labeled)—Three-pin connector on CRT
bezel provides power output (+15 V). Receives remote single
sweep reset signal from compatible camera systems, and a
ground pin connection.
ERASE-—Erases stored display.
10.
7. POWER-Switch controls the power to the instrument. Light
indicates that the power switch is on and that the instrument is mM
connected to a line voltage source. -
8. CALIBRATOR-Calibrator output pin jacks (4V, 0.4V, 13,
40 mV, and ground). Positive-going pulse or DC voltage selected
by changing internal jumper.
14,
9. VERT MODE-Selects vertical mode of operation.
LEFT: Signals from plug-in unit in left vertical compartment
15,
are displayed.
ALT: Signals from both plug-in units in both the left and 16.
right vertical compartments are displayed (dual trace).
Display switches between vertical plug-in units after each
sweep.
ADD: Signals from plug-in units in both the left and right 17.
REAR PANEL
1, FUSE-—Line voltage fuse.
2, REMOTE ERASE IN-Provides external connection for remote
erase.
3. EXT SS RESET IN—Remote single sweep reset.
4. EXT Z AXIS IN-Input for intensity modulation of the CRT
display.
5. VERT SIG OUT—Vertical signal selected by TRIG SOURCE
switch (LEFT, RIGHT, ALT and ADD).
6. +GATE OUT-Gate signal selected by gate selector switch
(Main, Auxiliary, and Delay).
7. +SAWTOOTH OUT-—Positive-going sawtooth from time-base
unit.
1-2
7613

Section 2—7613/R7613 Service
CALIBRATION
Calibration Interval
To assure instrument accuracy, check the calibration of
the 7613 every 1000 hours of operation, or every six
months if used infrequently. Before complete calibration,
thoroughly clean and inspect this instrument as outlined in
the Maintenance section.
TEKTRONIX Field Service
Tektronix, Inc. provides complete instrument repair and
recalibration at local Field Service Centers and the Factory
Service Center. Contact your local TEKTRONIX Field
Office or representative for further information.
Using This Procedure
General. This section provides several features to facili-
tate calibration of the 7613. These are:
index. An index is given preceding the calibration
procedure to aid in locating a step.
Partial Procedure. A partial calibration is often desirable
after replacing components, or to touch up the adjustment
of a portion of the instrument between major recalibra-
tions. To calibrate only part of the instrument, set the
controls as given under Preliminary Control Settings and
start with the nearest Equipment Required list preceding
the desired portion. To prevent unnecessary recalibration of
other parts of the instrument, re-adjust only if the tolerance
given in the CHECK- part of the step is not met. If
re-adjustment is necessary, also check the calibration of any
steps listed in the INTERACTION- part of the step.
Complete Calibration Procedure. Completion of each
step in the following calibration procedure insures that this
instrument is both correctly adjusted and performing
within all given tolerances.
IMPORTANT NOTE
All waveforms shown in this section were taken with
a TEKTRONIX Oscilloscope Camera System, unless
noted atherwise.
TEST EQUIPMENT REQUIRED
General
The test equipment and accessories, or its equivalent,
given in the Test Equipment table is required for complete
calibration of the 7613. Specifications given for the test
equipment are the minimum necessary for accurate calibra-
tion. Therefore, the specifications of any test equipment
used must meet or exceed the listed specifications. All test
equipment is assumed to be correctly calibrated and
operating within the listed specification. Detailed operating
instructions for the test equipment are not given in this
procedure. Refer to the instruction manual for the test
equipment if more information is needed.
Special Calibration Fixtures
Special TEKTRONIX calibration fixtures are used in this
procedure only where they facilitate instrument calibration.
These special calibration fixtures are available from
Tektronix, Inc. Order by part number through your local
TEKTRONIX Field Office or representative.
Calibration Equipment Alternatives
All of the listed test equipment is required to completely
check and adjust this instrument. This Calibration
procedure is based on the first item of equipment given as
an example of applicable equipment. When other
equipment is substituted, control settings or calibration
setup may need to be altered slightly to meet the
requirements of the substitute equipment. If the exact item
of test equipment given as an example in the Test
Equipment table is not available, first check the Specifica-
tions column carefully to see if any other equipment is
available which might suffice. Then check the Usage
column to see what this item of test equipment is used for.
lf used for a check or adjustment which is of little or no
importance to your measurement requirements, the item
and corresponding step(s) can be deleted.
The following procedure is written to completely check
and adjust the 7613 to the limits given in Section. 2 of the
Operators Manual and to allow interchanging 7000-series
plug-in units between 7000-series mainframes without the
need to recalibrate the instruments each time. If the
applications for which you will use the 7613 do not require
the full available performance from the 7613/plug-in
combination, this procedure and the required equipment
list can be shortened accordingly. For example, the basic
measurement capabilities of this instrument can be verified
by checking vertical deflection accuracy, vertical
square-wave response, and basic horizontal timing with
7000-series real-time plug-in units and an accurate square
wave signal. Also, if the 7613/plug-in combination is to be
used as a fixed system without the need to interchange
plug-in units, all tests can be made by substituting vertical
plug-in units and applicable test signals for the 067-0587-01
mainframe standardizer calibration fixture.
2-1
7613

Calibration—-7613/R7613 Service
TEST EQUIPMENT
Examples of Applicable
Description Minimum Specifications Usage Test Equipment
1. Precision DC Range, zero to 150 volts; | Calibrator output accuracy | a. TEKTRONIX 7D13 Digital
voltmeter accuracy, within 0.2%. check and adjustment. | Multimeter (test oscilloscope must
Low-voltage power supply | have Readout System).
adjustment.
b. Fluke Model 825A Differential DC
Voltmeter.
2. DC voltmeter
(VOM)
Range, zero to 4000 volts;
accuracy, checked to with-
in 1% at —1500 volts.
High-voitage power supply
check. Z-axis DC levels
adjustment.
a. Triplett Model 630-NA.
b. Simpson Model 262.
3. Time-mark
Marker outputs, 10 nano-
CRT geometry check and a. TEKTRONIX 2901 Time-Mark
generator seconds to 0.1 second; | adjustment. Horizontal | Generator.
marker accuracy, within | timing check and adjustment.
0.1%. Trigger output, one b. TEKTRONIX 184 = Time-Mark
millisecond. Generator.
4, High-frequency Frequency, 65 to above | Vertical bandwidth check. | TEKTRONIX calibration fixture
constant amplitude 190 megahertz, reference | Vertical amplifier isolation {| 067-0532-01 recommended.
signal generator frequency, 3 megahertz | check.
output amplitude variable
from 0.5 volt to 5 volts;
amplitude accuracy, with-
in 1% of reference as
output frequency changes.
5. Medium-fre- Frequency, 50 to 70 mega- | External Z-axis operation ja. TEKTRONIX 191 Constant Ampli-
quency constant- hertz; reference frequency, | check. Vertical bandwidth | tude Signal Generator.
amplitude signal
generator
50 sikilohertz; output
amplitude, variable from
five millivolts to five volts
peak to peak into 50
ohms; amplitude accuracy,
constant within 3% of
reference as output
frequency changes.
check. Vertical amplifier iso-
lation check. Horizontal
bandwidth check.
b. General Radio 1215-C with 1263-C
Amplitude Regulating Power Supply.
6. Low-frequency
signal generator
Frequency, 35 kilohertz;
output amplitude, variable
from 50 to 100 miltivolts.
X-Y phase shift check. a. General Radio 1310-B Oscillator.
7. Test-oscilloscope
system (dual-trace)
Bandwidth, DC to 50
megahertz; minimum de-
flection factor, 10
millivolts/division;
accuracy, within 3%.
Horizontal limit centering ad-
justment and + GATE OUT.
a. TEKTRONIX 7503 or 7504 Oscil-
loscope with two 7A15A or 7A16
Amplifier and 7B50 or 7B53A Time-
Base plug-in units, and two P6053
Probes.
b. TEKTRONIX 453A Oscilloscope
with two P6054 Probes.
8. Vertical plug-in
unit (two identical
units required), and
a dual display vertical
unit.
TEKTRONIX 7A-series 65
megahertz bandwidth
required for complete pro-
cedure as written.
Used throughout procedure
to provide vertical input to
7613 under calibration.
Identical units required only
for X-Y phase shift check.
The 7A18 is used to check
READOUT operation.
a. TEKTRONIX 7A15A and a 7A18
Amplifier (may be shared with
7000-series test oscilloscope)
b. Any 7A-series plug-in unit (tole-
rances in some steps may be limited if
low-frequency units used).
2-2
7613

TEST EQUIPMENT (cont)
Calibration—-7613/R7613 Service
Examples of Applicable
Description Minimum Specifications Usage Test Equipment
9. Time base TEKTRONIX 7B-series. Used through procedure to | a. TEKTRONIX 7B53A or 7B52
plug-in unit provide sweep. Time Base.
b. Any 7B-series plug-in unit.
10. Mainframe
standardizer cali-
bration fixture
Produces gain-check and
pluse-response waveforms.
Used throughout procedure
to standardize instrument so
plug-in units can be inter-
changed without complete
recalibration.
a. TEKTRONIX Calibration Fixture
067-0587-01.
b, Calibrated 7000-series plug-in units
with suitable signal sources may be
substituted if lower perforrnance is
acceptable.
11. 10X passive Compatible with 7B-series | Chopped mode operation | a. TEKTRONIX P6053 or P6054
probe external trigger input. check (adjustment pro- | Probe (may be shared with test
cedure). oscilloscope).
12. T connector Connectors, BNC. External Z-axis operation ja. TEKTRONIX Part No.
check. 103-0030-00.
13. Termination impedance, 50 ohms; | Horizontal timing check and |}a. TEKTRONIX Part No.
accuracy, +2%; connec- | adjustment. X-Y phase shift | 011-0049-01.
tors, BNC. check,
14, Dual-input Connectors, BNC. Added operation check. X-Y | a. TEKTRONIX Calibration Fixture
coupler phase shift check. 067-0525-00.
15. Cable (two Impedance, 50 ohms; | Used throughout procedure ja. TEKTRONIX Part No.
required) type, RF-58/U; length, 18 | for signal interconnection. 012-0076-00 (18-inch). TEKTRONIX
and 42 inches; connectors, Part No. 012-0057-01 (42-inch).
BNC.
16. GR in-line Impedance, 50 ohms; | External Z-axis operation |a. TEKTRONIX Part No.
termination accuracy, +2%; connec- | check. Vertical bandwidth | 017-0083-00.
tors, GR874 input with | check. Vertical amplifier iso-
BNC male output. lation check. Horizontal
bandwidth check.
17. Cable Impedance, 50 ohms; type | External Z-axis operation ja. TEKTRONIX Part No.
RG-213/U: electrical | check. Vertical bandwidth | 017-0502-00.
length, five nanoseconds; ; check. Vertical amplifier iso-
connectors, GR874. lation check. Horizontal
bandwidth check.
Adapts pin jacks to BNC | Added operation check. Trig) |a. TEKTRONIX Part No.
18. BNC to pin-
jack cable
male connector.
ger source operation check.
Astigmatism adjustment.
175-1178-00 (one supplied as standard
accessory).
19. Screwdriver
Three-inch shaft,
inch bit.
3/32-
Used throughout adjustment
procedure to adjust variable
resistors.
a. Xcelite R-3323.
20. Low-capacitance
screwdriver
1 1/2-inch shaft.
Used throughout adjustment
procedure to adjust variable
capacitors.
a, TEKTRONIX Part No.
003-0000-00.
7613

Calibration—7613/R7613 Service
Setup Procedure
NOTE
This instrument should be adjusted at an ambient
temperature of +25°C +5°C for best overall accuracy.
1. Remove the side covers from the 7613 or the top
cover and side panel from the R7613.
2. Connect the instrument to a power source which
meets the voltage and frequency requirements. The applied
voltage should be near the center of the voltage range
marked on the rear panel (see Section 1 for information on
converting this instrument from one operating voltage to
another).
lf correct line voltage is not available, usé a variable
autotransformer to provide the correct input voltage.
3. Set the controls as given under Preliminary Control
Settings. Allow at least 20 minutes warmup before
proceeding.
Titles for external controls of this instrament are
capitalized in this procedure (eg., INTENSITY).
Internal adjustments are initial capitalized only (e.g.,
CRT Grid Bias).
Preliminary Control Settings
Set the 7613 controls as follows:
INTENSITY
FOCUS
BEAM FINDER
GRATICULE ILLUM
VERT MODE
TRIG SOURCE
NON STORE
POWER
PERSISTENCE
STORED INTENSITY
SAVE
SAVETIME
2-4
Midrange
Adjust for well-defined
display
Out
As desired
LEFT
VERT MODE
IN
ON
MAX
Counterclockwise
Out
Counterclockwise (not
in detent)
Introduction
The following procedure returns the 7613 to correct
calibration. All limits and tolerances given in this procedure
are calibration guides, and should not be interpreted as
instrument specifications except as listed in Section 2 of
the Operators Manual.
Index to Calibration Procedure
Power Supply
1. Adjust —50 Volt Power Supply Page 3-5
2. Check Remaining Power-Supply Voltages Page 3-5
3. Check High-Voltage Power Supply Page 3-6
Display and Z-Axis
4. Adjust CRT Grid Bias Page 3-6
5. Adjust Astigmatisrn Page 3-7
6. Adjust Trace Rotation Page 3-7
7. Adjust Y-Axis Alignmerit Page 3-8
8. Adjust Geometry Page 3-8
9, Check External Z-Axis Operation Page 3-8
10. Check Beam Finder Page 3-8
Vertical Deflection System
11. Adjust Bias Adjustment Page 3-9
12. Adjust Vertical Centering Page 3-9
13. Check Vertical Gain Page 3-9
14. Check Vertical Linearity Page 3-10
15. Adjust Vertical High-Frequency Page 3-10
Compensation
16. Check Vertical Amplifier Bandwidth Page 3-10
17. Check Vertical Amplifier Isolation Page 3-11
18. Check Added Operation Page 3-11
19. Check Alternate Operation Page 3-11
20. Check Vertical Chopped Mode Page 3-12
Operation
Triggering System
21. Check Trigger Source Operation Page 3-12
7613

Horizontal Deflection System
22. Adjust Horizontal Amplifier Gain and
Low-Frequency Linearity
23. Adjust Horizontal Amplifier Centering
24. Adjust Horizontal Amplifier Limit
Centering
25. Adjust High-Frequency Timing
26. Check X-Y Phase Shift
27, Check Horizontal Bandwidth
Z-Axis and Auto Focus
28. Adjust Z-Axis Compensation
29. Adjust Auto Focus Compensation and
Operating Levels
Calibrator
30. Adjust Calibrator Output Voltage
31. Check Calibrator Repetition Rate
Signals Out
32. Check SINGLE SWEEP READY OUT
33. Check EXT SS RESET IN
34, Check VERT SIG OUT
35. Check +GATE OUT
36. Check +SAWTOOTH OUT
Readout Operation
37. Check READOUT SYSTEM Operation
38. Check READOUT Gate Triggered
Operation
Storage System
39. Check Storage Operation
40. Check Stored Writing Rate
41. Check Save Functions
42. Check Remote Erase
POWER SUPPLY
Equipment Required
1. Precision DC voltmeter
2. DC voltmeter (VOM)
3. Three-inch screwdriver
Calibration—7613/R7613 Service
Control Settings
Set the controls as given under Preliminary Control
Settings.
1. Adjust —50 Volt Power Supply
a. Set the INTENSITY control fully counterclockwise.
b. Connect the precision DC voltmeter between TP—50
{see Fig. 2-1A) and chassis ground.
c, CHECK—Meter reading; —50 volts 0.1 volt.
d. ADJUST— -—50 volts adjustment R881 (see Fig.
2-1B) for a meter reading of exactly —50 volts.
e. INTERACTION—Change in setting of R881 may
affect operation of all circuits within the 7613.
2. Check Remaining Power-Supply Voltages
a. CHECK—Table 2-1 lists the low-voltage power
supplies in this instrument. Check each supply with the
precision DC voltmeter for output voltage within the given
tolerance (connect meter ground lead to chassis ground).
Power supply test points are shown in Fig. 2-1A.
b. Disconnect the precision DC voltmeter.
NOTE
Ripple and regulation of the individual power
supplies can be checked using the procedure given
under Troubleshooting Techniques in Section 4.
TABLE 2-1
Power Supply Tolerance
Output Voltage
Power Supply Test Point Tolerance
—50 Volt Pin 8 P1170 0.1 Volt
—15 Volt Pin 7 P1170 +0.1 Volt
+5 Volt Pin 5 P1170 +0.07 Volt
+15 Volt Pin 4 P1170 +0.1 Volt
+50 Voit Pin 3 P1170 +0.3 Volt
+130 Volt Pin 2 P1170 +5.2 Volt
REV.
JAN
1974
2-5
7613

Calibration—7613/R7613 Service
High-Voltage
Test Point
Readout Board
Remove
Fig. 2-1. (A) Location of power supply and high.voltage test points
(right side of instrument); (B) Location of —50 V adjustment (Low
Voltage Regulator board).
3. Check High-Voltage Power Supply
a. Turn off instrument.
b. Set the DC voltmeter (VOM) to measure at least
3000 volts. Then, connect it between the high-voltage test
point (see Fig. 2-1A) and chassis ground.
c. Press power switch (turn on instrument). Check
meter reading; —1475 volts +45 volts.
d. Turn off instrument. Disconnect the DC voltmeter.
e. Turn on instrument.
DISPLAY AND Z-AXIS
Equipment Required
1. Mainframe standardizer calibration fixture
2. 7B53A plug-in unit
3. DC Voltmeter (VOM)
4. 7A15A plug-in unit
5. Time-mark generator
6. Medium-frequency generator
7. BNC to pin-jack cable
8. 18-inch 50-ohm BNC cable
9. 42-inch 50-ohm BNC cable
10. Five-nanosecond GR cable
11. 50-ohm GR in-line termination
12. BNC T connector
13. Three-inch screwdriver
14. Low-capacitance screwdriver
Control Settings
Set the controls as given under Preliminary Control
Settings.
4A. Adjust CRT Grid Bias
a. Install the mainframe standardizer calibration fixture
(or a vertical plug-in) in the left vertical compartment and
depress the LEFT VERT MODE button. Set the fixture for
Vert or Horiz +Step Resp, amplitude fully counterclock-
wise, and Position to midrange.
b. Install the time base plug-in in the horizontal
compartment, and set it for 1.0 ms/division. Adjust trig-
gering for a free-running sweep. If a 7B53A time base
plug-in is to be used with the 7613 (R7613), set it for
Intensified sweep.
c. Adjust the fixture Position control to bring the trace
‘on screen, then rotate both the INTENSITY and READ-
OUT INTENSITY controls fully counterclockwise.
d. Connect a 10X probe from the test-oscilloscope to
the Z-Axis test point (see Fig. 2-2) and the probe ground
lead to chassis ground.
e. Set the test-oscilloscope to DC input and a display of
5 volts/division (including probe attenuation), position the
trace to the center graticule line.
f. ADJUST—INTENSITY control for a display ampli-
tude 2 volts above the center graticule line.
g. ADJUST—CRT Bias adjustment R1261 (see Fig. 2-2)
until the trace on the 7613 (R7613) is just extinguished.
Set INTENSITY for a viewable trace.
26 REV. JAN 1974
7613

Calibration—7613/R7613 Service
R1193
A (Astigmatism) /
Adjustm:
R1261
CRT Grid Bias
oa —
R1250
Focus Preset
R1181
Trace Rotation
Y (Y-Axis)
Z-Axis
t
Test Point
Readout Board
Remove
Fig. 2-2. Location of Display and Z Axis adjustments and test points.
4B. Check Z-Axis DC Levels
a. Set the test-oscilloscope for 10 V/division, DC input,
and connect its 10X probe to the 7613 (R7613) Z-Axis
test point (see Fig. 2-2) and probe ground lead to chassis
ground.
b. Set the time base plug-in in the 7613 (R7613) to
50 ms/division, not intensified, and the test-oscilloscope
time base to 1 sec/div.
c. Set the calibration fixture Position control to posi-
tion the trace vertically off screen, and set the INTENSITY
control fully clockwise.
d. CHECK—The test-oscilloscope display amplitude
should be at least 58 volts, note this reading.
e. Set the 7613 (R7613) time base plug-in to 0.1
second/division.
f. CHECK—Pulse amplitude deflection on the test-
oscilloscope should decrease to between 25 volts to 35 volts
less than the amplitude in step d.
g. Disconnect the test oscilloscope 10X probe from the
7613 (R7613) and reduce the INTENSITY setting to a
normal intensity. Position the trace within the graticule
area.
5. Adjust Astigmatism
a. Set the 7B53A for auto, internal triggering at a sweep
rate of one millisecond/division.
b. Set the mainframe standardizer calibration fixture
Test switch to Vert or Horiz Aux In.
c. Connect the 4 V Calibrator pin-jack to the Aux In
connector of the calibration fixure with the BNC to
pin-jack cable.
d. Set the calibration fixture Position control for a
centered display, and the Amplitude control for about two
divisions of vertical deflection.
e. CHECK—CRT display is well defined.
f. ADJUST—FOCUS control and A (astigmatism) ad-
justment R1193 (see Fig. 2-2) to obtain best display
definition.
g. Disconnect the cable.
6. Adjust Trace Rotation
a. Set the INTENSITY control to midrange.
b. Move the trace to the center horizontal line with the
mainframe standardizer Position control.
REV. JAN 1974 27
7613

Calibration—7613/R7613 Service
c. CHECK—Trace aligns with the center horizontal line
within 0.1 division.
d. ADJUST—Trace Rotation adjustment R1181 (see
Fig. 2-2) to align the trace with the center horizontal line.
7. Adjust Y-Axis Alignment
a. Inter-change the 7B53A and mainframe standardizer
plug-in units.
b. Move the trace to the center vertical line with the
mainframe standardizer Position control.
c. CHECK—Trace aligns with the center vertical !ine
within 0.1 division.
d. ADJUST—Y-Axis adjustment R1190 (see Fig. 2-2) to
align the trace with the center vertical line.
8. Adjust Geometry
a. Remove the mainframe standardizer and install the
7B53A in the horizontal compartment. Replace the main-
frame standardizer in the left vertical compartment.
b. Set the VERT MODE switch to LEFT.
c. Connect the marker output of the time-mark genera-
tor to the Aux In connector of the calibration fixture with
an 18-inch 50-ohm BNC cable.
d. Connect the trigger output of the time-mark genera-
tor to the external trigger input connector of the 7B53A
with a 42-inch 50-ohm BNC cable.
e. Set the time-mark generator for one-millisecond
markers and one-millisecond triggers.
f. Set the calibration fixture Test switch to Vert or
Horiz Aux In and the Amplitude Step or Aux control fully
clockwise.
g. Set the 7B53A for auto triggering from the externa!
source at a sweep rate of 0.5 millisecond/division (magnifier
off).
h. Set the 7B53A variable time/division control to
obtain exactly one marker for each major graticule division.
2-8
i. Set the time-mark generator for both one- and
0.1-millisecond markers.
j. Position the baseline of the markers as far toward the
bottom of the graticule as possible with the calibration
fixture Position control.
k. CHECK—Vertical bowing and tilt of the marker
display is less than 0.1 division (each 0.1-millisecond
marker represents 0.1 division).
1. ADJUST—Geometry adjustment R1184 (see Fig. 2-2)
for minimum bowing of time markers. Adjustment may
have to be compromised to obtain less than 0.1 division
bowing and tilt everywhere within the graticule area.
9. Check External Z-Axis Operation
a. Install the 7A15A in the right vertical compartment.
b. Connect the output of the medium-frequency
constant-amplitude signal generator to the input of the
7A15A through the five-nanosecond GR cable, 50-ohm GR
in-line termination, and the BNC T connector.
c. Set the 7A15A for a deflection factor of one
volt/division.
d. Set the 7B53A for auto, internal triggering at a
calibrated sweep rate of 10 microseconds/division.
e. Set the medium-frequency generator for a two-
division display at its reference frequency (50 kilohertz).
f. Connect the output of the BNC T connector to the
EXT Z-AXIS connector with the 42-inch 50-ohm BNC
cable.
g. CHECK—Top portion of displayed waveform blanked
out,
h. Disconnect cable from external Z-AXIS connector.
10. Check Beam Finder
a. Set the 7A15A deflection factor to 20 millivolts/
division. Notice that the display exceeds the viewing area.
b. Press the BEAM FINDER switch.
7613

c. CHECK—Display compressed within graticule area.
d. Increase the 7A15A deflection factor until the
compressed display is reduced in amplitude.
e. Release the BEAM FINDER switch.
f. CHECK—Display remains within graticule area.
g. Disconnect all test equipment and remove the plug-in
units.
VERTICAL DEFLECTION SYSTEM
Equipment Required
1, Mainframe standardizer calibration fixture
2. 7B53A plug-in unit
3. High-frequency generator
4. 7A15A plug-in unit (two)
5. 10X probe
6. Five-nanosecond GR cable
7. 50-ohm GR in-line termination
8. BNC to pin-jack cable
9. Dual-input coupler
10. Three-inch screwdriver
11, Low-capacitance screwdriver
Control Settings
Set the controls given under Preliminary Control
Settings.
11. Adjust Bias Adjustment
a. Install the 7B53A in the horizontal compartment.
b. Set the 7B53A for auto, external triggering at a
sweep rate of one millisecond/division.
c. Install the mainframe standardizer calibration fixture
in the left vertical compartment. Set the calibration fixture
Test switch to VERT or HORIZ Gain and the Rep Rate
switch to 250 kHz.
Calibration—7613/R7613 Service
Vertical
Centering y 4
x ; »
425 9 C427
LD Sm Te
Fig. 2-3. Location of vertical system adjustments (Vertical Output
board).
d. ADJUST—Bias R486 for maximum gain. (See Fig.
2-3.)
12. Adjust Vertical Centering
a. Set the calibration fixture Test switch to Triggering
Gain.
b. The trace should be within 0.3 division of the
graticule center line.
c. ADJUST—Vertical Centering adjustment R403 (see
Fig. 2-3) to position the trace to the center horizontal line.
13. Adjust Vertical Gain
a. Set the calibration fixture Test switch to Vert or
Horiz Gain.
b. Position the display so the first and seventh traces are
near the top and bottom lines of the graticule.
c, CHECK—Deflection between the second and sixth
traces should be six divisions +0.06 division.
d. ADJUST—Vertical Gain adjustment R447 (see Fig.
2-3) for exactly six divisions of deflection between the
second and sixth traces.
e. Remove the calibration fixture from the left vertical
compartment and install it in the right vertical compart-
ment.
2-9
7613

Calibration—7613/R7613 Service
f. Set the VERT MODE switch to RIGHT.
g. CHECK—Deflection between the second and sixth
traces should be the same as part d or e 1%.
h. ADJUST—If necessary, re-adjust R447 for correct
tolerance in both parts d and h,
14. Check Vertical Linearity
a. Remove the mainframe standardizer calibration
fixture. Install the 7A15A in the left vertical compartment
and connect a 0.4 volt square wave signal from the
CALIBRATOR out jacks, Set the VERT MODE switch to
left.
b. Set the 7A15A Volts/Div switch to 0.2 volt/division.
Adjust the position control to keep the display centered on
the graticule and adjust the Variable Volts/Div control if
needed for a two division display.
c. CHECK-—Position the two divisions of display verti-
cally and check for not more than 0.1 division of
compression or expansion anywhere within the graticule
area. Remove the 7A15A and install the mainframe
standardizer calibration fixture.
15. Adjust Vertical High-Frequency Compensation
a. Set the calibration fixture Test switch to Vert or
Horiz +Step Resp, Rep Rate switch to 250 kHz, and adjust
the Amplitude control for a six-division display.
b. Set the 7B53A for a calibrated sweep rate of five
nanoseconds/division (use X10 magnifier). Set the trigger
source switch internal adjust trigger level control and
position control for a stable display, centered on the
graticule.
ec. CHECK—Check for optimum square corner and flat
top on displayed pulse with aberrations not to exceed +0.1
or —0.1 division with total peak-to-peak aberrations not to
exceed 0.1 division.
d. ADJUST—Long term flat response R455 and R465
for a flat-top pulse with positioning from top to bottom of
screen,
e. ADJUST—High-frequency compensation as given in
Table 2-2 for optimum square leading corner and flat top
with minimum aberrations within limits given in part c.
Location of adjustments is shown in Fig. 2-3. Use the
low-capacitance screwdriver to adjust the variable
capacitors. Repeat the complete adjustment procedure
several times to obtain optimum adjustment.
2-10
TABLE 2-2
High-Frequency Compensation
Primary Area
Adjustment | Of Pulse Affected | Best Sweep Rate
C420 and First 50 nano- 50 nanoseconds/
R421 seconds division
R425, C425, First 20 nano- 20 nanoseconds/
L474, and L478 | seconds division
C427 and First 5 nano- 20 nanoseconds/
R427 seconds divisions
f. Remove the calibration fixture from the left vertical
compartment and install it in the right vertical compart-
ment.
g. Set the VERT MODE switch to RIGHT.
h. CHECK—Optimum square leading corner and flat top
on the displayed pulse with aberrations not to exceed +0.1
or —0.1 division, with total peak-to-peak aberrations not to
exceed 0.1 division.
i. ADJUST—If necessary, compromise the adjustment of
C420, R421, R425, C425, L474, L478, C427, and R427
for best response from both the left and right vertical
compartments.
j. To verify correct high-frequency compensation,
perform the bandwidth check as given in next step.
16. Check Vertical Amplifier Bandwidth
a. Connect the high-frequency constant-amplitude signal
generator to the CW In connector of the mainframe
standardizer calibration fixture.
b. Set the Test switch of the calibration fixture to Vert
or Horiz Freq Resp.
c. Set the 7B53A for a sweep rate of 0.2 microsecond/
division.
d. Set the high-frequency generator for six divisions of
deflection, centered on the graticule, at a reference fre-
quency of 3 megahertz.
e. Without changing the output amplitude, increase the
output frequency of the high-frequency generator until the
display is reduced to 4.2 divisions (—3 dB point).
7613

f. CHECK—Output frequency must be 110 megahertz
or higher if using test fixture. If using amplifier, see systems
specification,
g. Remove the calibration fixture from the right vertical
compartment and install it in the left vertical compartment
(leave signal connected).
h. Set the VERT MODE switch to LEFT.
i. Repeat parts d through f. Actual frequency (right
vertical), 115 megahertz or higher.
j. Disconnect all test equipment (leave plug-in units
installed).
17. Check Vertical Amplifier lsolation
a. Remove the mainframe standardizer calibration
fixture from the right vertical compartment and install the
7A15A in this compartment.
b. Set the 7A15A for a deflection factor of 0.1
volt/division.
c. Connect the output of the high-frequency generator
to the input of the 7A15A.
d. Set the high-frequency generator for eight divisions
of deflection at 100 megahertz.
e. Set the VERT MODE switch to RIGHT.
f. CHECK—CRT display for not more than 0.1 division
of 100 megahertz signal (channel isolation at least 100:1).
g. Remove the 7A15A from the left vertical compart-
ment and install it in the right vertical compartment (leave
signal connected). ,
h. Set the high-frequency generator for eight divisions
of deflection at 100 megahertz.
i. Set the VERT MODE switch to LEFT.
j. CHECK—CRT display for not more than 0.1 division
of 100 megahertz signal.
Calibration—7613/R7613 Service
k. Disconnect all test equipment.
18. Check ADD Operation
a. Install the other 7A15A in the left vertical compart-
ment.
b. Set both 7A15A units for a deflection factor of 0.2
volt/division.
c. Connect the 0.4 V Calibrator signal to the inputs of
the 7A15A units with the BNC to pin-jack cable and
dual-input coupler.
d. Set the 7B53A for auto, internal triggering at a sweep
rate of 0.5 millisecond/division.
e. Center the display with the feft 7A15A Position
control and note the vertical deflection.
f. Set the VERT MODE switch to RIGHT.
g. Center the display with the right 7A15A Position
control and note the vertical deflection.
h. Set the VERT MODE switch to ADD.
i. CHECK—CRT display; vertical deflection should
approximately equal the algebraic sum of the deflection
noted in parts e and g of this step.
j. Disconnect the BNC to pin-jack cable and dual-input
coupler.
19. Check Alternate Operation
a. Set the VERT MODE switch to ALT.
b. Position the traces about two divisions apart.
c. Turn the 7B53A Time/Division switch throughout its
range.
d. CHECK—Trace alternation between the left and right
7A15A units at all sweep rates. At faster sweep rates,
alternation will not be apparent; instead display appears as
two traces on the screen.
2-11
7613

Calibration—7613/R7613 Service
20. Check Vertical Chopped Mode Operation
a. Connect the 10X probe to the external trigger input
of the 7B53A,
b. Connect the probe tip to TP67 (see Fig. 2-4).
c. Position the trace several divisions above the center
line with the Position control.
d. Set the VERT MODE switch to CHOP.
e. Set the 7B53A for auto, external triggering at a sweep
rate of 0.2 microsecond/division.
f. CHECK—CRT display for chopped waveform display
with duration of the time segment from each channel,
including the blanked portion, between two and three
divisions. Also, check that the unblanked (visible) portion
of the time segment from each channel consists of at least
75% of the duration of the total channel segment.
g. Disconnect the probe and remove all plug-in units.
TRIGGERING SYSTEM
Equipment Required
1. Mainframe standardizer calibration fixture
2. 7B53A plug-in unit
3. 7A15A plug-in unit
4. BNC to pin-jack cable
Fig. 2-4. Location of TP67 on Logic board (shown with power unit
removed).
2-12
Control Settings
Set the controls as given under Preliminary Control
Settings.
21. Check Trigger Source Operation
a. Install the mainframe standardizer calibration fixture
in the right vertical compartment and the 7A15A in the left
vertical compartment.
b. Install the 7B53A in the horizontal compartment.
c. Set the 7B53A for auto, internal triggering at a sweep
rate of 0.5 millisecond/division.
d. Set the 7A15A for a deflection factor of 0.2
volt/division.
e. Connect the 0.4 V Calibrator pin-jack to the input of
the 7A15A with the BNC to pin-jack cable.
f. Position the Calibrator waveform display in the upper
half of the graticule area with the 7A15A Position control.
g. Set the VERT MODE switch to RIGHT.
h. Set the calibration fixture Test switch to Vert or
Horiz +Step Resp, Rep Rate switch to 250 Hz, and adjust
the Amplitude control for a two-division display. Position
the display in the lower half of the graticule area.
i. Set the VERT MODE switch to ALT.
j. CHECK-CRT display; both square-wave displays are
stable.
k. Set the TRIG SOURCE switch to LEFT.
|. CHECK—CRT display; Calibrator display only is
stable.
m. Set the TRIG SOURCE switch to RIGHT.
n. CHECK—CRT display; calibration fixture display
only is stable.
o. Disconnect the BNC to pin-jack cable and remove the
plug-in units.
7613

HORIZONTAL DEFLECTION SYSTEM
Equipment Required
1. 7B53A plug-in unit
2. 7A15A plug-in unit (two)
3. Mainframe standardizer calibration fixture
4. Test-oscilloscope system with two 10X probes
5. Time-mark generator
6. Low-frequency generator
7. Medium-frequency generator
8. Dual-input coupler
9. Five-nanosecond GR cable
10. 50-ohm GR in-line termination
11. 42-inch 50-ohm BNC cable
12, 50-ohm BNC termination
13. Three-inch screwdriver
14. Low-capacitance screwdriver
Control Settings
Set the controls as given under Preliminary Control
Settings.
22. Adjust Horizontal Amplifier Limit Centering
a. Install the 7B53A in the horizontal compartment.
b. Set the 7B53A for auto, internal triggering at a sweep
rate of one millisecond/division with the magnifier on.
c. Connect 10X probes to both inputs of the test
oscilloscope. Connect the probe tips to the horizontal
deflection plate connectors of the 7613 (be sure probes are
compensated).
d. Set both channels of the test oscilloscope for a
vertical deflection factor of 1.0 volt/division (ten volts/
division at probe tip) in the chop dual-trace mode with the
input coupling set to ground.
e. Position the ground-reference traces displayed on the
test oscilloscope to the center horizontal line of the
graticule. Do not change the test-oscilloscope position
controls after establishing this ground reference.
Calibration—76 13/R7613 Service
f. Set the test oscilloscope for DC input coupling and
set the triggering controls so the test oscilloscope is
triggered from the signal on channel 1 only. Set the
triggering controls for a stable display at a sweep rate of
two milliseconds/division,
g. CHECK—The base line of both displayed waveforms
should be at the same DC level within 0.2 division (see Fig.
2-5).
h. ADJUST—Limit Centering adjustment R535 (see Fig.
2-6) to match the DC levels of both waveforms.
i. Disconnect all test equipment and remove the 7B53A.
23. Adjust Horizontal Amplifier Centering
a. Install the calibration fixture in the horizontal comp-
artment and set the Test Switch to Triggering Gain.
b. CHECK—Spot produced by 7B53A should align with
the vertical center line of the graticule within 0.3 division.
c. ADJUST—Horizontal Centering adjustment R525
(see Fig. 2-6) to position the spot to the vertical center line.
d. INTERACTION—If R525 is adjusted, re-check steps
22 and 23.
e. Remove the calibration fixture from the horizontal
compartment.
Fig. 25. Test oscilloscope waveforms when horizontal limit
centering is properly adjusted.
2-13
7613