Tektronix 7A24 User manual

Tektronix, Inc.
P.O.
Box 500
Beaverton, Oregon 97077
070-2391-00
COMMITTED TO EXCELLENCE
··;·· ... DUALTRA.C.E·A:ft,h\~IJFI EA·······
.. sN .•. ·.ijiQ3booL~.·p·
INSTRUCTION MANUAL
Serial Number ______ _
Scans by ArtekMedia © 2006 First
Printing SEPTEMBER 1977

Scans
By
ArtelMedia
Artek Media
1042 Pl umme r Cir. SW
R oc hester . MN 55902
www.arlekmedia.com
" Hi gh resolution scans of obso lete te chnical manuals"
If your looking for a quality scanned technical manual in PDF format please visit
our WEB site al www.artekmedia. com or drop us an email at
manuals@artekmedia.c om and we wi ll be happy to email you a current list of the
manuals we have available.
If yo u don't see the manual you need on the list drop us a line anyway we may
st ill be able to po int you to other sources. If you ha ve an existing manual you
would like scanned please write for details, This can often be done very
reasonably in consideration for add i ng your manual to our library .
Typically the scans in our manua ls are done as follows :
1) Typed text pages are typically scanned in black and while at 300 dpi.
2) Photo pages are typically scanned in gray scale mode at 600 dpi
3) Schemalic diagram pages are typically scanned in black and white at 600
dpi unless the original manual had colored high lighting (as is the case for
some 70 's vintage Tektronix manuals).
If
you purcha sed this manual from us (ty pi ca ll y through ou r Ebay name of
ArtekMedia) thank you very mu ch . If you received this from a we ll -meaning
"friend"
fo r free we wou ld appreciale your treating this much like you would
"share ware ". By that we mean a donation of at least $5- 10 per manual is
appreciated in recognition of the time (a manual can take as much as 40 hours to
reproduce, book, link etc.), energy and quality of effort that went into preserving
th is manual. Donations via PayPal go to: manuals@artekmedia. com or can be
mailed to us the address above.
Dave & Lynn Henderson
Artek Med ia

Copyright Cl 1977 Tektronix, I nc . All rights reserved.
Contents
of this publication may not be reproduced in any
form
without the written permiss ion of Tektronix , Inc.
Products of Tektronix, Inc . and its subsidiaries are
covered
by U.S. and foreign patents andl or pending
patents.
TEKTRONIXr TEK, SCOPE·MOBILE , and ~ are reg·
istered trademarks of T ektronix , I nc . TELEQUIPMENT is
a registered
trademark of Tektronix U.K. Limited.
Printed
in U.S. A. S pecification and price change
privileges are reserved.
Scans by ArtekMedia @2006

7A24 (SN 8103000 & LIP)
TABLE OF CONTENTS
PAGE
LIST OF ILLUSTRATIONS .................................................... ii
LIST OF TABLES ................................................................ ii
SAFETY INFORMATION ..................................................... iii
SECTION 1 OPERATING INSTRUCTIONS
CONTROLS AND CONNECTORS .............................. 1-1
FUNCTIONAL CHECK ............................................. 1-1
SETUP PROCEDURE .......................................... 1-1
CHECKOUT PROCEDURE
................................... 1-3
DETAILED OPERATING INFORMATION .................... 1-3
INTRODUCTION ................................................. 1-3
SIGNAL CONNECTIONS ..................................... 1-3
VERTICAL GAIN CHECK AND ADJUSTMENT ....... 1-3
INPUT COUPLING .............................................. 1-3
INPUT PROTECTION FUSE ................................. 1-4
VERTICAL DEFLECTION FACTOR ........................ 1 -4
POLARITY SWiTCHING ...................................... 1-4
DISPLAY MODES .............................................. 1-4
TRIGGER MODES .............................................. 1-4
TRACE IDENTIFiCATION ..................................... 1-5
BASIC APPLICATIONS ............................................ 1-5
GENERAL ......................................................... 1-5
PEAK-TO-PEAK VOLTAGE MEASUREMENTS....... 1-5
INSTANTANEOUS VOLTAGE MEASUREMENTS.... 1-6
COMPARISON MEASUREMENTS ........................ 1-6
DUAL TRACE PHASE DIFFERENCE
MEASUREMENTS .............................................. 1-7
HIGH RESOLUTION PHASE MEASUREMENTS ..... 1-8
COMMON MODE REJECTION ............................ 1-8
SECTION 2 SPECIFICATION
Electrical .......................................................... 2-1
Environmental
................................................... 2-2
Physical ............................................................ 2-2
I WARNING I
THE REMAINING PORTION OF THIS TABLE OF CONTENTS
LISTS THE SERVICING INSTRUCTIONS. THESE
SERVICING INSTRUCTIONS ARE FOR USE BY QUALIFIED
PERSONNEL ONLY. TO AVOID ELECTRICAL SHOCK. DO
NOT PERFORM ANY SERVICING OTHER THAN THAT
CALLED OUT IN THE OPERATING INSTRUCTIONS UNLESS
QUALIFIED TO DO SO.
SECTION 3 THEORY OF OPERATION
INTRODUCTION ..................................................... 3-1
BLOCK DIAGRAM .................................................. 3-1
CH 1 AND CH 2 ATIENUATORS ............................. 3-1
CH 1 AND CH 2 AMPLIFIERS ................................. 3-2
DISPLAY SWITCHING AND OUTPUT ........................ 3-2
CH 1 AND CH 2 READOUT .................................... 3-3
@
PAGE
SECTION 4 MAINTENANCE
PREVENTIVE MAINTENANCE ....................................... 4-1
GENERAL
.............................................................. 4-1
CLEANING ............................................................ 4-1
LUBRICATION ........................................................ 4-1
TROUBLESHOOTING ................................................... 4-3
GENERAL .............................................................. 4-3
TROUBLESHOOTING AIDS ...................................... 4-3
TROUBLESHOOTING EQUiPMENT .......................... .4-4
TROUBLESHOOTING PROCEDURE .......................... .4-4
CORRECTIVE MAINTENANCE ...................................... 4-6
GENERAL ............................................................. .4-6
OBTAINING REPLACEMENT PARTS ........................ .4-6
SOLDERING TECHNIQUES ...................................... 4-6
COMPONENT REPLACEMENT ................................. 4-7
FUSE AND ATIENUATOR REPLACEMENT ........... 4-7
SEMICONDUCTOR REPLACEMENT ...................... 4-7
CIRCUIT BOARD REMOVAL ............................... 4-7
INTERCONNECTING PINS ................................... 4-8
SWITCH REPLACEMENT ................................... .4-8
READJUSTMENT AFTER REPAIR ............................. 4-9
REPACKAGING FOR SHIPMENT ............................. .4-9
SECTION 5 PERFORMANCE CHECK AND ADJUSTMENT
PRELIMINARY INFORMATION ................................. 5-1
ADJUSTMENT INTERVAL
................................... 5-1
TEKTRONIX FIELD SERViCE ............................... 5-1
USING THIS PROCEDURE .................................. 5-1
TEST EQUIPMENT REQUiRED ................................. 5-1
SPECIAL CALIBRATION FIXTURES ...................... 5-1
TEST EQUIPMENT ALTERNATIVES ...................... 5-1
PRELIMINARY PROCEDURE
.................................... 5-4
INDEX TO PERFORMANCE CHECK AND
ADJUSTMENT PROCEDURE
.................................... 5-4
LOW FREQUENCY PROCEDURE .............................. 5-5
HIGH FREQUENCY PROCEDURE ............................. 5-8
SECTION 6 INSTRUMENT OPTIONS
SECTION 7 REPLACEABLE ELECTRICAL PARTS
SECTION 8 DIAGRAMS AND CIRCUIT BOARD
ILLUSTRATIONS
SECTION 9 REPLACEABLE MECHANICAL PARTS
CHANGE INFORMATION
Scans by ArlekMedia© 2006

7A24 (SN B103000 8t UP)
LIST OF ILLUSTRATIONS
Figure
N~ PAGE
1-1 7A24 Dual-Trace Amplifier ................. iv
1-2 Release Latch
.......................... 1-1
1-3 7A24 Front-Panel Controls and Connectors ..... 1-2
1-4 Measuring the peak-to-peak voltage
of a
waveform ......................... 1-5
1-5 Measuring instantaneous voltage with
respect to some reference ................. 1-6
1-6 Measuring phase difference between two signals. 1-8
1-7
High resolution phase measurement using
time-base magnifier ..................... 1-8
1-8 Using the ADD mode for common-mode
rejection ............................. 1-9
2-1 7 A24 dimensional drawi ng ................. 2-2
4-1 Lubrication procedure for a typical cam switch ... 4-1
4-2 Color code for resistors and capacitors ......... 4-2
4-3 Semiconductor electrode configurations ........ 4-3
4-4 Orientation of multi-connector holders ......... 4-4
4-5 Coaxial end-lead connector assembly ......... 4-8
4-6
Exploded view of circuit-board pin and ferrule ... 4-9
5-1 Test circuit for Input Resistance Check/Adjust
step ................................. 5-5
5-2
Approximately 2.5 division pulse obtained
in step 11f ............................ 5-9
5-3 Short pulse before cancellation .............. 5-9
The illustrations in Section 8 are located near their associated
diagrams on foldout pages.
8-1
Circuit board locator.
8-2 Semiconductor lead configurations.
8-3 A1 and A3 Attenuator circuit board assembly.
8-4 A5 and A6 Amplifier circuit board assembly.
8-5 A5 and A6 Amplifier circuit board assembly.
8-6 A2 and A4 Readout circuit board assembly.
8-7 7A24 Adjustment locations.
8-8 7A24 Troubleshooting chart.
LIST OF TABLES
Table
No. PAGE
1-1 Trigger Signal Source .................... 1-5
2-1 Electrical Specifications ................... 2-1
2-2 Environmental Specifications ............... 2-2
2-3
Physical Specifications .................... 2-2
5-1 Test Equipment ......................... 5-2
5-2 Attenuator Accuracy ..................... 5-7
ii REV A SEP 1980
Scans by ArtekMedia © 2006

7A24 (SN 8103000 8t UP)
SAFETY INFORMATION
This manual contains safety information which the user must follow to ensure safe operation of this instrument.
WARNING information is intended to protect the operator; CAUTION information is intended to protect the
instrument. The following are general safety precautions that must be observed during all phases of operation and
maintenance.
WARNING I
GROUND THE INSTRUMENT
To reduce electrical-shock hazard, the mainframe (oscilloscope) chassis must be grounded. Refer to the mainframe
manual for grounding information.
DO NOT OPERATE IN EXPLOSIVE ATMOSPHERE
Do not operate this instrument in an area where flammable gases or fumes are present. Such operation could
cause an explosion.
AVOID LIVE CIRCUITS
Electrical-shock hazards are present in this instrument. The protective instrument covers must not be removed by
operating personnel. Component replacement and internal adjustments must be referred to qualified service
personnel.
DO NOT SERVICE OR ADJUST ALONE
Do not service or make internal adjustments to this instrument unless another person capable of giving first aid
and resuscitation is present.
WARNING I
WARNING STATEMENTS
Warning statements accompany potentially dangerous procedures in this manual. The following warnings appear in
this manual and are listed here for additional emphasis.
To avoid electric-shock hazard, disconnect the instrument from the power source before soldering.
To avoid electric-shock hazard, disconnect the instrument from the power source before replacing components.
@ iii
Scans by ArtekMedia © 2006

7A24 ISN B103000 • UP)
.~
I
INVER!
POSITION
5 0n eM 2
~ , - , ~,
~ O ff
n"-_
7A24
239 1·1
7A24 FEATURES
The 7A24 is a dual-channel, wide-bandwidth amplifier plug -i n unit designed for use with Tektronix 7000-series Oscillo·
scopes. Each channel has an i nput impedance of 50 ohms and is internallv fused. Internal attenuatoB and gain circuits
are switched to correspond to the settings of the VOLT/DIV switches. Channel 2 can be inver ted and added to channe ll
for different ial measurements.
Figure ,., . 7A24 DUll- Trice Amplifier.
iv @
Scans by ArtekMedia@2006

Section 1-7A24 (SN 8103000 & UP)
OPERATING INSTRUCTIONS
The 7A24 Vertical Amplifier unit operates with any Tektroni)( 7000-series oscilloscope mainframe and any 78 -
series
time -base unit to fo rm a complete oscilloscope system. This section of the manua l describes the operation
of the front -panel controls and connectors, provides a functional check procedure, detailed operating information ,
and basic applications
for this inst rument.
INSTALLATION
The 7A24 is calibrated and ready for use as received.
It can be installed in any compartment of Tektroni)(
7000-series oscilloscopes, but is principally used in
vertical plug-
in compartments. To install, align the
upper and l
ower rails of the 7A24 with the
oscilloscope tracks and fully insert it. The 7A24 is
fully inserted when the front is fl ush with the front of
the oscilloscope and
the latch at the bottom -le ft corner
of the 7A24 is in place agai nst the front panel. See
Figure 1-2 for the latch location.
To remove the 7A24 , pull on the latch (which is
inscribed
with the unit identification " 7A24 ") and the
7A24 will unla tch. Continue pulling on the la tch to
slide
the 7A24 out of the OSCilloscope.
-
j
--
-0
--
'=" •.
~ .
7... 24
RELEASE
LATCH
...
Figur . ' -2 . R. I •• •• Latch.
239 1-2
CONTROLS AND CONNECTORS
All controls and connectors required for operation of
the Vertical Amplifie r are located on the front panel.
Figure 1-3 provides a bri
ef descr iptio n of all front-
@
panel controls and connectors. See Detailed Operating
In
structions for more information.
FUNCTIONAL CHECK
The follow ing procedures are provided for checking
basic
instrument functions . Refer to the description of
the contro ls and connectors whife performing this
procedure. If performing the functional check
procedure reveals a ma
lf unction or possible incorrect
adjustment , first check the operation of the associated
oscilloscope and
plug - in units , then refer 10 the
i nstruction manual for maintenan ce and adjustment
procedures.
SETUP PROCEDURE
1. Insert the 7A24 into the left vertical plug-in
compartment of a 7000 -series OSCilloscope mainframe .
2. Insert a 7000 -sedes time -base unit into th e B hori·
20ntal
plug-in compart ment .
3. Set
the controls as follows :
7A24 Verti cal Amplifi er
CH 1, CH 2 POSITION .. .. .. Midrange
CH 2 POLARITY. ........ ... .... +UP
CH 1, CH 2 VOlTS /DIV .....10 mV
CH 1, CH 2 INPUT
COUPLING
.. . . .. .......... . .. DC
CH 1, CH 2 VARIABlE .......CAL IN
DISPLAY MODE.... ..
....... . .. CH 1
TRIGGER SOURCE .. ......... .MODE
Level/Slope...
Time Base
...Centered on positive
slope
Triggering Mode .. ... ...P-P Auto or Auto
Coupling .. .. . ....... . ............. AC
Source..
...... .
Ti me/Div .
Variable
........
..Int
... ....... 1 ms
..
.. Cal In
Magnifier ....... .. .....In
P
osition .. .. .. .......... .. Midrange
1·1
Scans by ArtekMedia © 2006

Operating Instru c tions-7A24 (SN 8103000 & UP)
Controls
.od
of the CH 1 t~
Oeflects tr&ee about 0.3 division
trllee identification, in
inurumenu
with readout also repl&ees readout
with the word IDENTIFY.
1-2
II
of inVilrti ng the CH
,.
CM Z l"OlAalTY
i
When the VARIABLE is
pushed in, it becomes I f:~':~~::I '1
screwdriver adjustment fe
I
calibrated deflKtion
/1 ;"~;~5 mV/div to 1 V/div; eight
I
I
Ii
mode.
I.
2391-3
Figure 1-3. 7A24 Fro nt -Panel contr ol. a nd co nnect or •.
@
Scans by ArtekMedia © 2006

Mainframe
Vertical Mode .................... Left
Horizontal
Mode ................ B
Intensity ............................ CCW
Calibrator
.......................... 1 kHz, 40 mV under load
Trigger Source
................... Left Vert
4. Connect the mainframe to a power source which
meets the voltage and frequency requirements of the
mainframe power supply.
5. Turn the mainframe power on and allow about five
minutes warmup.
6. Advance the Intensity until a free-running trace is
observed.
Adjust the position controls to center the
trace on the crt.
7. Connect the mainframe calibrator output to the
7A24 CH 1 Input connector.
CHECKOUT PROCEDURE
8. Check the crt display for four divisions of vertical
deflection. If necessary,
push in the CH 1 VARIABLE
control with a screwdriver and adjust the vertical gain
for exactly four divisions.
9. Press the IDENTIFY button and check that the
display moves
upward about 0.3 divisions. Also check
that the readout information on the crt is replaced by
the word "IDENTIFY".
10. Press and release
the CH 1 VARIABLE control to
its outward position. Turn the VARIABLE control fully
counterclockwise and check for 1.6 divisions or less
display amplitude. Press
the VARIABLE control to the
CAL IN position.
11. Change
the 7A24 Vertical Amplifier CH
VOLTS/DIV to 0.1 V, the mainframe calibrator volts to
0.4 V (0.2 V), and the time-base Triggering Source to
Ext. Connect
the calibrator output through a BNC T
connector to the time-base Ext Trig In and the 7A24
CH 2 Input. Set the POLARITY switch to INVERT to
display the opposite polarity of the square wave.
12. Return
the POLARITY switch to +LlP and set the
TRIGGER SOURCE to CH 1. Change the time-base
Triggering Source to Int and observe that the trace is
no
longer triggered.
13. Return
the TRIGGER SOURCE to MODE and set
the DISPLAY MODE to ADD. Observe that only the CH
1 POSITION control moves the trace.
14. Set
the DISPLAY MODE to CHOP. Observe that
the channel one trace is controlled by the CH 1
POSITION control and the channel two signal is
controlled by the CH 2 POSITION control.
REV A MAR 1980
Operating Instructions-7A24 (SN 8103000 & UP)
This completes the basic operating procedure for the
7A24. Instrument operation not explained here or
operation
which needs further explanation is discussed
under Detailed Operating Information.
DETAILED OPERATING
INFORMATION
INTRODUCTION
For single-trace operation, either of the two identical
amplifier channels can be used independently by
setting the DISPLAY MODE and TRIGGER SOURCE
switches to CH 1 or CH 2 and connecting the signal
to be observed to the appropriate Input. In the
discussions to follow, single-trace operations using CH
1 only apply equally to CH 2 only.
SIGNAL CONNECTIONS
The 50-ohm input impedance of the 7A24 is ideally
suited
for making waveform measurements on 50-ohm
systems, in that 50-ohm coaxial cables can be
connected
directly to the Input of the 7A24. The
7A24, however, should not be connected directly to a
power supply, power line, or other voltage source that
would exceed the input voltage limits of the 7A24 (see
Specification section, Table 2-1). Probes recommended
for use with the 7 A24 are the P6056 (1 OX) and
P6057 (1 OOX). Both probes are compatible with 50-
ohm systems, and will allow optimum frequency
response. These probes also contain trace IDENTIFY
and readout encoding functions. A one-megohm input
impedance may be achieved by using the P6201 FET
Probe.
VERTICAL GAIN CHECK AND ADJUSTMENT
To check the gain of either channel, set the VOL TS/OIV
switch to 50 mV and connect a 0.4 V (under load), one-
kilohertz signal from the oscilloscope calibrator to the
Input connector of the channel being checked. The vertical
deflection should be exactly
four divisions. If not, adjust
the front-panel
GAIN for exactly four divisions of deflection.
The
GAl N adjustment is engaged by pressing in the GAl N
control knob and turning the knob with a narrow-blade
screwdriver
(see Fig. 1-3, Front Panel Controls and Connect-
ors). Turn the knob clockwise, then counterclockwise, until
the GAIN control is engaged. When the GAIN control is
engaged, the vertical deflection will change as the knob is
turned. Turn the GAl N control knob with the screwdriver
until the deflection is set to exactly four divisions, then
remove the screwdriver.
INPUT COUPLING
The Channel 1 and Channel 2 Input Coupling (OFF-
DC) switches select the signal input coupling mode.
1-3
Scans by ArlekMedia © 2006

Operating Instructions-7A24 (SN 8103000 & UP)
DC
The DC position couples both ac and dc components
of the signal into the input amplifier. A 50-ohm
impedance is presented to the signal source.
OFF
The OFF position disconnects the signal source from
the amplifier and connects it to a resistive 50-ohm
termination.
INPUT PROTECTION FUSE
A fuse in the input of each channel protects the 7A24
from damage due to excessive signal voltages. If this
fuse is open, no display can be obtained.
If no waveform can be displayed, but the POSITION
control will move the trace on the crt, the condition of
the fuse should be checked by a qualified service
technician.
VERTICAL DEFLECTION FACTOR
The amount of vertical deflection produced by a signal
is determined by the signal amplitude, the attenuation
factor of the probe, the setting of the VOLTS/DIV
switch, and the setting of the VARIABLE control. Cali-
brated deflection factors indicated by the settings of
the VOLTS/DIV switch apply only when the VARIABLE
control is in the calibrated (CAL IN) position.
The VARIABLE control provides variable, uncalibrated
settings between the calibrated steps of the
VOLTS/DIV switch. With the VARIABLE control fully
counterclockwise and the VOL TS/DIV switch set to 1
volt/division the uncalibrated vertical deflection factor
is extended to at least 2.5 volts/division. By applying
a calibrated voltage source to the Input connector, any
specific deflection
factor can be set within the range
of the VARIABLE control.
POLARITY SWITCHING
The CH 2 POLARITY switch may be used to invert the
displayed waveform of the signal applied to the CH 2
Input. This is particularly useful in added-mode
operation
of the 7A24 when differential measurements
are to be made. The CH 2 POLARITY switch has two
positions, +UP and INVERT. In the +LlP position, the
displayed waveform will have the same polarity as the
applied signal and a positive dc voltage will move the
crt trace up. In the INVERT position, a waveform at
the CH 2 Input will be displayed on the crt in inverted
form and a positive dc voltage will move the trace
down.
DISPLAY MODES
For single-trace operation, apply the signal either to
the CH 1 Input or the CH 2 Input and set the
DISPLAY MODE switch to the corresponding position:
CH 1 or CH 2.
1-4
To display a signal in one channel independently
when a signal is also applied to the other channel,
simply select
the desired channel by setting the
DISPLAY MODE switch to the appropriate CH 1 or CH
2 position.
Alternate Mode
The ALT position of the DISPLAY MODE switch
produces a display which alternates between Channel
1 and Channel 2 with each sweep on the crt.
Although the AL T mode can be used at all sweep
rates, the CHOP mode provides a more satisfactory
display at sweep rates below about 0.5 millisecond/
division. At slow sweep rates, alternate mode
switching becomes visually perceptible.
Add Mode
The ADD position of the DISPLAY MODE switch can
be used
to display the sum or difference of two
signals, for common-mode rejection to remove an
undesired signal,
or for dc offset (applying a dc voltage
to one channel to offset the dc component of a signal
on the other channel). The overall deflection factor in
the ADD mode with both VOLTS/DIV switches set to
the same position is the deflection factor indicated by
either VOLTS/DIV switch. However, if the CH 1 and
CH 2 VOLTS/DIV switches are set to different
deflection factors, the resultant amplitude is difficult to
determine from the crt display. In this case, the
voltage amplitude of the resultant display can be
determined
accurately only if the amplitude of the
signal applied to one channel is known. In the ADD
mode, positioning of the trace is controlled by the
Channel 1 POSITION control only.
Chop Mode
The CHOP position of the DISPLAY MODE switch
produces a display which is electronically switched
between channels at approximately a 500 kilohertz
rate (controlled by mainframe). In general the CHOP
mode provides the best display at sweep rates slower
than about 0.5 millisecond/division or whenever dual-
trace, non-repetitive phenomena is to be displayed.
TRIGGER MODES
CH 1
The CH 1 position of the TRIGGER SOURCE switch
provides a trigger signal obtained from the Signal
applied
to the CH 1 Input connector. This provides a
stable display of the signal applied to the CH 1 Input
connector.
CH 2
The CH 2 position of the TRIGGER SOURCE switch
provides a trigger signal obtained from the signal
applied
to the CH 2 Input connector. This provides a
stable display of the Signal applied to the CH 2 Input
connector.
@
Scans by ArlekMedia © 2006

MODE
In this position of the TRIGGER SOURCE switch, the
trigger signal for the time-base unit is dependent on
the setting of the DISPLAY MODE switch. The trigger
source for each position of the DISPLAY MODE switch
is shown in Table 1-1.
Mode
CH 1
CH 2
ADD
CHOP
ALT
TABLE 1-1
Trigger
Mode Sources
Trigger Signal Source
Channel 1
Channel 2
Algebraic sum of Channel 1 and Channel 2
Algebraic sum of Channel 1 and Channel 2
Alternates between Channel 1 and Channel 2
TRACE IDENTIFICATION
When the IDENTIFY button is pressed, the trace is
deflected about 0.3 division to identify the 7A24 trace.
This
feature is particularly useful when multiple traces
are displayed. In
instruments with readout. pressing
the IDENTIFY button also replaces the deflection factor
readout
with the word "IDENTIFY".
BASIC APPLICATIONS
GENERAL
The following information describes the procedures
and
techniques for making basic measurements with a
7A24 and the associated Tektronix oscilloscope and
time base. These applications are not described in
detail since each application must be adapted to the
requirements of the individual measurements. This
instrument can also be used for many applications not
described in this manual. Contact your local Tektronix
Field Office or representative for assistance in making
specific
measurements with this instrument.
PEAK-TO-PEAK VOLTAGE MEASUREMENTS
To make peak-to-peak voltage measurements, use the
following procedure:
1. Apply the signal to either Input connector.
2. Set the DISPLAY MODE and TRIGGER SOURCE
switches to display the channel used.
3. Set the Input Coupling switch to DC.
4. Set the VOL TSIDIV switch to display about five
vertical divisions of the waveform.
5. Set the time-base Triggering controls for a stable
display. Set
the time-base unit to a sweep rate that
displays several cycles of the waveform.
@
Operating Instructions-7A24 (SN B103000 &. UP)
6. Turn the 7 A24 POSITION control so the lower
portion of the waveform coincides with one of the
graticule lines below the center horizontal line, and
the top of the waveform is within the viewing area.
With the time-base Position control, move the display
so one of the upper peaks lies near the center vertical
line (see Fig. 1-4).
T
VERTICAL
DEFLECTION
POSITION TO
CENTER LINE
-L+--f-¥-+-----j~L+-------+--V-t
r-+------+-+---+------f-----+----+----I----
2391-10
Figure 1-4. Measuring the peak-to-peak voltage of a
waveform.
7. Measure the divisions of vertical deflection peak-to-
peak. Check
that the VARIABLE (VOL TS/DIV) control is
in
the CAL IN position.
NOTE
This technique can also be used to make
measurements between two points on the
waveform,
rather than peak-to-peak.
8.
Multiply the deflection measured in step 7 by the
VOLTSIDIV switch setting. Include the attenuation
factor of the probe, if used.
EXAMPLE:
Assume that the peak-to-peak vertical
deflection is
4.5 divisions (see Fig. 1-4) using a 10X
attenuator probe, and the VOL TSIDIV switch is set to
1 V.
vertical probe
Volts
Peak-to-
Peak =
deflection X VOL TSI X attenuation
(divisions) DIV setting factor
Substituting
the given values:
Volts Peak-to-Peak =
4.5 X 1 X 10
The peak-to-peak voltage is 45 volts.
1-5
Scans by ArtekMedia © 2006

Operating Instructions-7A24 (SN 8103000 & UP)
INSTANTANEOUS VOLTAGE MEASUREMENTS
To measure the dc level at a given point on a
waveform, proceed as
follows:
1. Connect the signal to either Input connector.
2. Set the DISPLAY MODE and TRIGGER SOURCE
switches to display the channel used.
3. Set the VOL TS/DIV switch to display about five
divisions
of the waveform.
4. Set the
Input Coupling switch to OFF and position
the trace to the bottom graticule line or another
reference line. If the voltage is negative with respect
to ground, position
the trace to the top graticule line.
Do not move the POSITION control after this reference
line has been established.
NOTE
To measure a voltage level with respect to
a voltage other than ground, make the
fol/owing changes to step 4: Set the Input
Coupling switch to DC and apply the
reference voltage to the
Input connector,
then position the trace to the reference
line.
5. Set the Input Coupling switch to DC. The ground
reference
line can be checked at any time by
switching to the OFF position.
6. Set the time-base Triggering controls for a stable
display. Set the time-base
sweep rate for an optimum
display of the waveform.
7. Measure the distance in divisions between the
reference
line and the point on the waveform at
which the dc level is to be measured. For example, in
Figure
1-5 the measurement is between the reference
line and point A.
8. Establish the polarity of the waveform. With the
CH 2 POLARITY switch in the +UP position, any point
above the reference line is positive.
9. Multiply the distance measured in step 7 by the
VOLTS/DIV setting. Include the attenuation factor of
the probe, if used.
EXAMPLE:
Assume the vertical distance measured is
3.6 divisions (see Fig. 1-5) and the waveform is above
the reference line using a 10X probe with a
VOLTS/DIV setting of .5 V.
Using the formula:
Instan-
taneous
Voltage
1-6
vertical
= distance X
(divi-
sions)
VOL TSI probe
polarity X DIV X attenua-
setting tion
factor
Substituting the given values:
Instantaneous
Voltage =
3.6 X +1 X 0.5 V X 10
The instantaneous voltage is 18 volts.
COMPARISON MEASUREMENTS
In some applications it may be desirable to establish
arbitrary units of measurement other than those
indicated by
the VOL TS/DIV switch. This is particularly
useful when comparing unknown signals to a
reference amplitude. One use
for the comparison-
measurement technique is to facilitate calibration of
equipment where the desired amplitude does not
produce an exact number of divisions of deflection.
The adjustment will be easier and more accurate if
arbitrary units of measurement are established so that
the correct adjustment is indicated by an exact
number of divisions of deflection. The following
procedure describes how to establish arbitrary units of
measure
for comparison measurements.
To establish an arbitrary vertical deflection factor
based upon a specific reference amplitude, proceed as
follows:
1. Connect the reference signal to the Input connec-
tor. Set the time-base
unit sweep rate to display
several cycles of
the signal.
2. Set the VOL TS/DIV switch and the VARIABLE
control to produce a display
which is an exact number
of vertical divisions in amplitude. Do not change the
VARIABLE control after obtaining the desired
deflection.
I I
POINT A
j I
--
'--
1---
--_.
Ti
VER~IC~L ...;-
DISTANCE
REFERENCE
I
LINE
I I
2391-11
Figure 1-5. Measuring instantaneous voltage with respect
to some reference.
@
Scans by ArtekMedia © 2006

3. To establish an arbitrary vertical deflection factor so
that the amplitude of an unknown signal can be
measured accurately
at any setting of the VOLTS/DIV
switch, the amplitude of the reference signal must be
known. If it is not known, it can be measured before
the VARIABLE VOLTS/DIV control is set in step 2.
4. Divide the
amplitude of the reference signal (volts)
by the product of the vertical deflection (divisions)
established in step 2 and the setting of the
VOLTS/DIV switch. This is the vertical conversion
factor.
Vertical
Conversion
Factor
reference signal
amplitude (volts)
vertical
deflection
(divisions)
VOLTS/DIV
x switch
setting
5. To measure
the amplitude of an unknown signal,
disconnect the reference signal and connect the
unknown signal to the Input connector. Set the
VOLTS/DIV switch to a setting that provides sufficient
vertical deflection to make an accurate measurement.
Do
not readjust the VARIABLE control.
6.
Measure the vertical deflection in divisions and
calculate
the amplitude of the unknown signal using
the following. formula:
Signal VOL
TSI vertical vertical
Amplitude =DIV setting X conversion X deflection
factor (divisions)
EXAMPLE:
Assume a reference signal amplitude of 3
volts, a VOLTS/DIV setting of .5 V, and the VARIABLE
control adjusted to provide a vertical deflection of four
divisions. Substituting these values in the vertical
conversion
factor formula (step 4):
Vertical
Conversion
Factor =
3V
1.5
4 X.5 V
Then with a VOL TS/DIV setting of .2 V, the peak-to-
peak
amplitude of an unknown signal which produces
a vertical deflection
of five divisions can be
determined by using the signal amplitude formula
(step 6):
Signal
Amplitude = .2 V X 1.5 X 5 1.5 volts
@
Operating Instructions-7A24 (SN 8103000 &. UP)
DUAL-TRACE PHASE DIFFERENCE
MEASUREMENTS
Phase comparison between two signals of the same
frequency can be made using the dual-trace feature of
the 7A24. This method of phase-difference
measurement can be used up to the frequency limit of
the oscilloscope system. To make the comparison, use
the following procedure:
1. Set the CH 1 and CH 2 Input Coupling switches to
DC.
2. Set the DISPLAY MODE to ALT or CHOP. In
general, CHOP is more suitable
for low frequencies
and
AL T is more suitable for high frequencies. Set the
TRIGGER SOURCE to CH 1.
3. Connect the referencesignal to the CH 1 Input and the
comparison signal tothe CH 2 Input. Usecoaxial cables or
probes which have similar time-delay characteristics to
connect the signals to the input connectors.
4. If the signals are of opposite polarity, set the CH 2
POLARITY switch to invert the Channel 2 display.
(Signals may be
of opposite polarity due to 180°
phase difference; if so, take this into account in the
final calculation.)
5. Set the VOLTS/DIV switches and the VARIABLE
controls of the two channels so the displays are equal
and about five divisions in amplitude.
6. Set the time-base unit to a sweep rate which
displays about one cycle of each waveform. Set the
Triggering controls for a stable display.
7. Center the waveforms on the graticule with the
7A24 POSITION controls.
8. Adjust the time-base Variable Time/Div control
until one cycle of the reference signal occupies exactly
eight horizontal divisions between the second and
tenth vertical lines of the graticule (see Fig. 1-6). Each
division of the graticule represents 45° of the cycle
(360° ± 8 divisions = 45° Idivision). The sweep rate
can
now be stated in terms of degrees; for example,
45° Idivision.
9. Measure the horizontal difference between
corresponding
points on the waveform.
10. Multiply the measured distance (in divisions) by
45° Idivision to obtain the exact amount of phase
difference.
1-7
Scans by ArtekMedia © 2006

Operating Instructions-7A24 (SN 8103000 &. UP)
2391·12
Figure 1-6. Measuring phase difference between two
signals.
EXAMPLE: Assume a horizontal difference of 0.3
division with a sweep rate of 45° /division as shown
in Figure 1-6.
Using the formula:
Phase Difference = horizontal
difference
(divisions)
Substituting
the given values:
sweep rate
X
(degrees/
division)
Phase Difference =
0.3 X 45°
The phase difference is 13.5°.
HIGH-RESOLUTION PHASE MEASUREMENTS
More accurate dual-trace phase measurements can be
made by increasing the sweep rate (without changing
the Variable
Time/Div control). One of the easiest
ways to increase the sweep rate is with the time-base
Magnifier switch. Set the Magnifier to X10 and
determine the magnified sweep rate by dividing the
sweep rate obtained previously by the amount of
sweep magnification.
EXAMPLE:
If the sweep rate is increased 10 times by
the Magnifier, the magnified sweep rate is
45°/division .;- 10 = 4.5°/division. Figure 1-7 shows
the same signals as used in Figure 1-6 but with the
Magnifier set to X10. With a horizontal difference of 3
divisions,
the phase difference is:
Phase Difference =
1-8
horizontal
difference
(divisions)
magnified
X sweep rate
(degrees/
division)
Substituting the given values:
Phase Difference =3 X
4.5°
The phase difference is 13.5° .
. i
I
.-
j
! CH~NNE~ 1 I i
1
r-IREFERENCE)
I
1 V
1-
r,t-
---
CHATEL~--l
~
1"'00-.
-.
-
.......
r--
~
r--
~
...
HORIZONTAL
~
1-
DIFFERENCE
I
J I
2391·13
Figure 1-7. High resolution phase measurement using time-
base magnifier.
COMMON-MODE REJECTION
The ADD feature of the 7A24 can be used to display
signals
which contain undesirable components.
Undesirable common-mode signals of 8 divisions or
less can be eliminated by using the 7A24 as a
differential amplifier in ADD mode. The procedure is
as follows:
1. Set the DISPLAY MODE switch to AL T or CHOP
and the TRIGGER SOURCE switch to MODE.
2. Connect the signal containing both the desired and
undesired
information to the CH 1 Input connector.
3. Connect a signal
similar to the unwanted portion of
the CH 1 signal to the CH 2 Input connector. For
example, in Figure 1-8 a line-frequency signal is con-
nected to Channel 2 to cancel out the line-frequency
component of the Channel 1 signal.
4. Set both Input Coupling switches to the DC
position.
5. Set the VOLTS/DIV switches so the signals are
about equal in amplitude.
6. Set the DISPLAY MODE switch to ADD. Set the CH
2 POLARITY switch to INVERT so the common-mode
signals are
of opposite polarity.
@
Scans by ArlekMedia © 2006

--
,4
~
.,
, ,
~
-,...
lJ.
..
--.
_.
",
~
~
'-
'- ..
~
--
-
(A) CHANNEL 1 SIGNAL.
I
--+-
i
-
i
l/~
... , i
1/
~
I
,
'"
~
-
(B) CHANNEL 2 SIGNAL.
--
I- f-
-
1-
po
,
..
~ ..
.. ..
~ ..
~ ~
'" III
• III
~ III ~ III
• III
(C) RESULTANT DISPLAY.
2391·14
Figure 1-8. Using the ADD mode for common-mode
rejection. (A) Channel 1 signal contains desired information
along with line-frequency component. (B) Channel 2
contains line frequency only. (C) Resultant CRT display
using common-mode rejection.
@
Operating Instructions-7A24 (SN 8103000 &. UP)
7. Adjust the Channel 2 VOLTS/OIV switch and
VARIABLE control for maximum cancellation of the
common-mode signal. The signal which remains
should be only the desired portion of the Channel
signal.
EXAMPLE: An example of this mode of operation is
shown in Figure 1-8. The signal applied to Channel
contains unwanted line-frequency components (Fig. 1-
8A). A corresponding line-frequency signal is
connected to Channel 2 (Fig. 1-8B). Figure 1-8C
shows the desired portion of the signal as displayed
when common-mode rejection is used.
The above procedure can also be used
for examining a
signal superimposed on some dc level. A dc voltage of
the proper polarity applied to Channel 2 can be used
to cancel out the dc portion of the signal applied to
Channell.
1-9
Scans by ArlekMedia © 2006
ArtekMedia
Digitally signed by ArtekMedia
DN: cn=ArtekMedia, o=ArtekMedia.com, ou,
[email protected], c=US
Date: 2008.11.16 19:48:32 -06'00'

Section 2-7A24 (SN B103000 & UP)
SPECIFICATION
The following electrical characteristics are valid over the stated environmental range for instruments calibrated at an
ambient temperature
of +200 to +300 C, and after a twenty-minute warmup unless otherwise noted.
Characteristic
Deflection Factor
Calibrated Range
Gain Ratio Accuracy
Uncalibrated (VARIABLE)
GAIN Range
Frequency Response Bandwidth
Maximum Input Voltage
Input Characteristics
DC Resistance
VSWR
Common-Mode Rejection Ratio
Display Modes
Trigger Source Selection
REV B SEP 1979
TABLE 2-1
Electrical
Performance Requirement
5 mV IDiv to 1 V IDiv; eight steps in a 1, 2, 5 sequence.
±2%
of indicated deflection factor with GAIN adjusted at
10 mV/Div.
Continuously variable between calibrated steps; extends
deflection factor
to at least 2.5 volts per division.
Permits adjustment
of deflection factor for calibrated
operation with all Tektronix 7000-series oscilloscopes.
Refer
to 7000-series Oscilloscope specification for
system bandwidths.
5 volts rms (0.5 watts).
50.0 ohms, ±1.0 n dc coupled.
5 mV
to 10 mV:
~1.25 dc to 250 MHz
~1.30 250 MHz to 350 MHz
~1.40 350 MHz to 400 MHz
20 mV to 1 V:
~1.15 dc to 400 MHz
At least 10:1, dc to 50 MHz, with 8 divisions or less
common-mode signal.
Channel 1 only.
Dual-trace, alternate between channels.
Added algebraically.
Dual-trace, chopped between channels.
Channel 2 only.
Channel 1 only.
Follows DISPLAY
~ODE selection.
Channel 2 only.
2-1
Scans by ArtekMedia © 2006

Specification-7A24 (SN B103000 • UP)
Temperature
Altitude
EMC
Transportation
Size
Weight
12.7 em
(5.0")
Characteristic
Characteristic
e@
o @
i :,O@
~i218'"~
2-2
TABLE 2-2
Environmental
Information
Refer to 7000-series Oscilloscope System-EISOO1 B
Specification; associated 7000-series Mainframe.
Qualified under NSTC Test Procedure 1A. Category
II.
TABLE 2-3
Physical
Information
Fits all 7000-series plug-in compartments.
1.2 Kilograms
(2 Pounds 9 Ounces).
1..--------- 37.1 em ----- ____ ....... ~I
(14.6")
Figure 2-1. 7 A24 dimensional drawing.
Scans by ArlekMedia © 2006
2391·4
@

Section 3-7A24 (SN 8103000 & UP)
THEORY OF OPERATION
INTRODUCTION
This section of the manual contains a description of
the circuitry used in the 7A24. The 7A24 description
begins
with a discussion of the instrument using the
block diagram shown in the Diagrams section. The
circuit diagrams are segmented with gray-tint blocks
named according to circuit function. These circuit
block titles serve as indexes to the circuit discussion.
Detailed diagrams of each circuit are located in the
diagram foldout section at the rear of this manual.
Refer to the appropriate diagram when reading this
discussion.
BLOCK DIAGRAM
The Channel 1 Amplifier circuit provides gain setting,
variable gain control. and trace positioning. The
Channel 2 Amplifier provides signal-polarity inversion
in addition
to gain setting, variable gain control, and
trace positioning. The signal to
be displayed on the crt
is applied to the CH 1 or CH 2 Input connector. The
signal passes through the Input Coupling switch,
where it is either connected to the attenuators or to a
50-ohm dummy load. The VOL TS/DIV switch selects
the correct amount of attenuation, and the signal is
passed
to the Switched-Gain Amplifier.
When the VOL TS/DIV switch is set to the 5 mV and
10 mV positions, the signal connected to the Input
connector is passed through the attenuators without
attenuation. When the VOL TS/DIV switch is set in the
5 mV position, the Switched-Gain Amplifier operates
at full gain. In all other positions of the VOLTS/DIV
switch, the gain of the Switched-Gain Amplifier is
reduced by
two. Internal gain and balance adjustments
are included in the Switched-Gain Amplifier.
Overall GAIN and VARIABLE gain are adjusted in the
Gain Amplifier. Variable balance and high-frequency
adjustments are also controlled in the Gain Amplifier.
The output of the Gain Amplifier is connected to the
Positioning circuitry where the POSITION and
IDENTIFY functions are controlled. This circuitry also
shifts the signal level to provide zero volts at the plug-
in output. Channel 2 is identical to Channel 1, with
the exception of the polarity-inversion function in
Channel 2.
The Signal
Splitter Amplifier divides the signal for use
at the Display and Trigger Channel Switching
amplifiers.
The Display and Trigger Channel Switching amplifiers
provide differential signal outputs for the signal and
trigger lines, from each channel, to a common display
and trigger output.
@
The output of the Display and Trigger Channel Switch-
ing amplifiers are connected to the oscilloscope
mainframe via the interface connector.
Readout encoding
circuitry used in the 7 A24 is
compatible with all 7000-series mainframes.
CH 1 AND CH 2 ATTENUATORS <J>
NOTE
The CH 1 and CH 2 8mplifier circuits are
identical
with the exception of the CH 2
GAIN stage U2450,
which includes a
POLARITY inverting circuit. Only CH 2 is
described
in detail throughout this
discussion.
INPUT FUSE AND SWITCH
Signals connected to the Input connector pass through
a 0.2 ampere fuse (F100) before reaching the Input
Coupling switch. The fuse protects the attenuators and
amplifier by preventing excessive voltages from reach-
ing these components.
Input signals can be dc-coupled or internally
disconnected. S100A is a cam-type switch; a contact-
closure
chart showing the operation is given on the
schematic diagrams. When the Input Coupling switch
is in the DC position, the input signal is connected to
the attenuators. The OFF position opens the signal
path to the attenuators and connects the input signal
to an internal 50-ohm dummy load. This provides a
ground reference
without the need to disconnect the
applied Signal from the Input connector, and presents
a
constant 50-ohm load at the Input connector.
INPUT ATIENUATOR
The effective overall deflection factor of the 7 A24 is
determined by the setting of the VOLTS/DIV switch,
S1 OOB. The basic deflection factor is 10 millivolts per
division
of crt deflection. To increase the deflection
factor to the values indicated on the front panel,
precision attenuators are switched into the circuit.
S100B is a cam-type switch. The dots on the contact-
closure chart (see Diagram 1) indicate when the asso-
ciated contacts are in
the position shown (open or
closed). In the 5 mV /Div and 10 mV /Div positions,
the attenuators are not used; the input signal is
connected
directly to the Switched-Gain Amplifier. The
10 mV /Div position decreases the gain of the
Switched-Gain Amplifier. For switch positions above
10 mV /Div, the attenuators are either switched into
the circuit singly or are stacked, producing the
3-1
Scans by ArtekMedia © 2006

Theory of Operation-7A24 (SN 8103000 8r. UP)
deflection factor indicated on the front panel. The
hybrid
attenuators are constant impedance, T-pad
dividers. In addition to providing constant
attenuation
at all frequencies within the bandwidth of the
instrument, the input attenuators are designed to
maintain the same input impedance (50 ohms) for all
settings of the VOLTS/DIV switch.
CH 1 AND CH 2 AMPLIFIERS ~
SWITCHED-GAIN AMPLIFIER
The coaxial coupler between the Attenuator circuit
board and the Main Amplifier circuit board acts as a
balun
transformer to provide differential drive to
U1350 at high frequencies. U1350 is a paraphase-type
amplifier with dual differential outputs.
Inthe 5 mVposition, full driveisprovided from pins 5 and 9
of
U1350tothe U1450 load resistors, R1401 and R1403.ln
all other attenuator positions, the signal-path drive current
through theload resistors is divided in half. Theother half is
diverted
through pins 6 and 8 of U1350 and is dissipated in
dummy-load resistors .R1334 and R1336. Resistor R1332
sets
the basic gain by afactor of two for all positions of the
VOLTS/DIV switch except 5 mV.
Components CR1319 and
R1319 maintain proper
collector voltage
while switching between the 5 mV
and 10 mV positions. Components C1332 and R 1332
compensate for thermal variations. Components R1336
and
C1336 are high-frequency adjustments.
Fixed
length inductors and capacitors are part of the
Amplifier etched circuit board and provide T-coil
peaking at
the input of U1350.
GAIN AND POLARITY INVERT AMPLIFIER
Integrated circuit U2450 is a variable-gain cascode
amplifier which sets the overall channel gain. The
GAIN (R2432B) and VARIABLE (R2432A) controls
determine the ratio of base currents through pins 11
and 12 of U2450. The base-current ratio determines
the shared collector output levels between pins 5-6, 8-
9.
Variable resistor R2424 provides adjustable low-
frequency compensation. Resistors R2422 and RT2420
compensate for temperature variations. Components
R2430 and C2430 provide adjustable high-frequency
compensation. The
U2450 input T-coil peaking
inductors and capacitors are
part of the circuit board.
Dc balance over
the variable range is adjusted by
R2410.
LEVEL SHIFT AND POSITION CONTROL
This circuitry shifts the dc level between U2450 and
U2550, and provides positioning current.
3-2
Low frequency and dc signals are coupled through
R2450, L2450, 02450, R2455 and R2460, L2460,
02460, R2455 which shifts the quiescent level from
+8 volts to -8 volts. Capacitors C2450 and C2460,
located in the transmission line between U2450 and
U2550, provide ac coupling for high-frequency signals.
Resistors R2452 and R2462 provide operating
current
for 02450, 02460, and U2450 while R2467 and
R2468 set the operating point of these devices. The
level shifter gain is unity.
Transistors
02470 and 02480 are current sources
which add positioning current to the input of U2550.
When POSITION control R2487 is at center, 02470
and 02480 provide equal currents resulting in zero
offset current. As
the control is rotated from center
the differential offset at 02470 and 02480 produces a
corresponding amount of positioning current. Resistors
R2473, R2483, R2486, and R2487
form a base
voltage divider
for 02470 and 02480 in all display
modes except ADD. In ADD, CR2474 and CR2484
conduct, which replaces R2487 with R2474 and
R2484. Thus,
the CH 2 POSITION control is disabled
in ADD mode
which limits position control to Channel
1 only.
The IDENTIFY circuit, composed
of R2488, CR2488,
and S2465, adds enough current to 02480 to produce
approximately 0.3 division trace shift at the crt for
trace identification. When S2465 is closed, the
junction of CR2488, R2488, and R2489 becomes more
positive resulting in additional
emitter current at
02480 (approximately 200 microamps). When the
switch is open, the junction shifts more negative and
less
emitter current flows. In this condition, when a
multiplier probe is connected to the CH 2 Input, the
additional resistance to ground produces just enough
current shift at the readout circuit (Diagram 4) to
indicate
the appropriate multiplier on the crt.
SIGNAL SPLITIER AMPLIFIER
Integrated circuit U2550 provides two separate signals
for use in the display and trigger channel switches on
Diagram 3. Components
C2515 and R2515 provide
adjustable high frequency compensation.
Output
transient response is adjustable at C2560, C2562,
R2560, and R2562.
DISPLAY SWITCHING AND
OUTPUT ~
DISPLAY AND TRIGGER SWITCHING
The display and trigger channel switches provide
selection
of the channel one and/or channel two
signals from the Switching Amplifiers on Diagram 2
for use in the mainframe.
REV A, FEB 1979
Scans by ArtekMedia © 2006