Tektronix AA 501A User manual

- --
COMMITTEDTO EXCELLENCE
PLEASE CHECK FOR CHANGE INFORMATION
AT THE REAR OF THIS MANUAL.
AA 501A
DISTORTION
ANALYZER
WITH OPTIONS 01 AND 02
INSTRUCTION MANUAL
I ,,,
i
Tektronix, Inc.
P.O. Box 500
Beaverton, Oregon 97077
070-6592-00
Product Group76
Serial Number
First Printing JULY 1987

Copyright 1987 Tektronix, Inc. All rights reserved.
Contentsof this publicationmay not
be reproduced in any form
without the written permissionof Tektronix, Inc.
Products of Tektronix, Inc. and its subsidiaries are covered by
U.S. and foreign patentsand/or pending patents.
TEKTRONIX, TEK, SCOPE-MOBILE, and
@ are registered
trademarks of Tektronix, Inc. TELEQUIPMENT is a registered
trademark of Tektronix, 1nc.TELEQUIPMENT is a registered
trademark of Tketronix U.K. Limited.

TABLE OF CONTENTS
Page
.....................
LIST OF ILLUSTRATIONS iii
............................
LIST OF TABLES iv
.............
OPERATOR'S SAFETY SUMMARY v
.................
SERVICE SAFETY SUMMARY vi
Section 1 SPECIFICATION
.............. Instrument Description 1-1
PerformanceConditions
............. 1-1
ElectricalCharacteristics
............. 1-2
EnvironmentalCharacteristics
........ 1-8
PhysicalCharacteristics
............. 1-8
Section
2 OPERATING INSTRUCTIONS
Preparation for Use
................
Repackaging Information ............
Controls. Connectors. and Indicators ...
Instrument Connections .............
Level Measurements ................
Distortion Measurements ............
Distortion Measurement Procedure ....
High Distortion Measurement Limitations 2-8
IM Distortion Measurements(Option 01
....................
and Option 02) 2-8
IM Distortion Measurement Procedure
........... (Option 01 and Option 02) 2-10
...........................
Filters 2-11
..........................
Displays 2-13
........................
Monitoring 2-13
THE FOLLOWING SERVICING INSTRUC-
TIONS ARE FOR USE BY QUALIFIED PER-
SONNEL ONLY
. TO AVOID PERSONAL INJU-
RY. DO NOT PERFORM ANY SERVICING
OTHER THAN THAT CONTAINED IN OPER-
ATING INSTRUCTIONS UNLESS YOU ARE
QUALIFIED TO DO SO
. REFER TO OPERA-
TORS SAFETY SUMMARY AND SERVICE
SAFETY SUMMARY PRIOR TO PERFORM-
ING ANY SERVICE
.
Section 3 THEORY OF OPERATION
.......................
Introduction 3-1
.....................
Input Amplifier 3-1
.............
Automatic Gain Control 3-2
.......................
Notch Filter 3-2
........
Frequency Band Discriminator 3-3
Notch Filter Control
................. 3-5
Distortion Amplifier
................. 3-5
Filters and AC-DC Converters
(Standard and Option 01 Instruments
............................
Only) 3-6
Filters and AC-DC Converters
.........
(Option 02 Instruments Only) 3-7
dB Converter
...................... 3-7
................
dB Offset Generator 3-8
dB Ratio Circuitry
..................
6 V Reference .....................
DVMIlnterface .....................
.....................
Display Board
Logic Circuitry
.....................
Power Supplies ....................
IM Analyzer (Option 01 and 02 only) ...
Section 4 CALIBRATION
PERFORMANCECHECK
Introduction
.................... 4-1
........
Performance Check Interval 4-1
...............
Services Available 4-1
Test Equipment Required
.......... 4-1
......... Performance Check Steps 4-2
AA 501A Performance Check
......................
Summary 4-3
...................
PROCEDURE 4-7
ADJUSTMENT PROCEDURE
....................
Introduction 4-19
Test Equipment Required
.......... 4-19
.....................
Preparation 4-19
...................
PROCEDURE 4-19

TABLE OF CONTENTS (cont)
Section 5 MAINTENANCE
Introduction .
.. .. . ... .. .. .. . . ... . . . .
Preparation For Use ... .. .. .. .. .. . . .
On-board Jumpers . ... ...... . .. . .
REAR INTERFACE INFORMATION
Functions Available at Rear Connector. .
+ and - lnput connectors(28B,28A)
lnput Common (27B,27A) . . .. . . .. .
Auxiliary lnput (25B).... . ...... .. .
Auxiliary lnput Ground (268) ... . ...
Function Output (238) .. . ... ......
FunctionOutput Ground (248) .. .. ..
lnput Monitor (24A) . . . .. . ... .... .
lnput Monitor Ground (23A) .. .. . ...
Converter Output (20A) ..... ..... .
dB Converter Output (19B) . .. . . ...
dB Converter Output Ground (20B) ..
General Maintenance Information ... ...
Troubleshooting Aids .. . . .. . . . ....
Diagrams ... . ... .. . .... .... . .
Circuit Board Illustrations ..... ..
Calibration Fixtures .. . . . . . .. . . . ..
Troubleshooting Equipment .. . . ....
Static-SensitiveComponents .......
Obtaining Replacement Parts . ... . .
Circuit Board Removal . . . . . ... . .. .
1. Top Cover Removal ... . . . . . .
2. Bottom and Back Covers
Removal
. . . . .. . .... . .. . .. .
3. Main (A15), InputINotch(A1 4),
and IMD (Option01 and Option
Section
5 MAINTENANCE (cont)
02 Only (A13) Boards Removal
4. Control Logic (A12) and DVM/
Interface(A16) Boards Removal
5. Display Board (A10) Removal
.
Magnetic Shield ...... . . ..... . . ..
Soldering Techniques . . . .. . . .. . ...
Semiconductors ... .. . . . . .. . .....
CoaxialCables .. .. ... .. ... . .. ...
Exterior Cleaning . . ..... . . . .... . .
Chassis .....................
Front Panel . . . . .. . . . . . . . .... .
InteriorCleaning . . .. . . . ... . . . ... .
Troubleshooting High Residual
Distortion Problems
. ... . . . .. . .. ..
Section 6 OPTIONS
Section 7 REPLACEABLE ELECTRICAL PARTS
Section
8 DIAGRAMSAND CIRCUIT BOARD
ILLUSTRATIONS
Section
9 REPLACEABLE MECHANICAL PARTS
CHANGE INFORMATION

LIST OF ILLUSTRATIONS
Fig.
No.
Page
Installationand removal . ....... . . .. .. ..
Front panelcontrols and connectors . .....
Typical connections for distortion
measurements.
... .... ... .... . .... ...
Block diagram of a basic harmonic distortion
analyzer
............................
Transfer characteristicsof an audio device
THD test of transfer characteristics
. .. . ..
Block diagram of basic IM analyzer .... ..
IMtest of transfer characteristicsin time and
frequency domain
.... .. .. . . .. .. . . .. . .
Responsecurves for AA 501A filters . .. . .
Oscilloscopedisplay of deviationfrom
linearity
. . . . . . ... . . ..... . . ......... ..
3-1
Simplified notch filter . . . .. . . . . . . . .. .. . . 3-2
3-2
Frequency banddiscriminator .. . . . . . . . . . 3-4
3-3
Intermodulationdistortion analyzer block
diagram
. . . .. .. .... . . ... . . .. . . . . . . .. 3-11
4-1 AA 501A
grounded unbalancedinput
connection
. ... . . .. . . . ... .. . .. . . ..... 4-7
4-2
. AA 501A common mode input connection 4-8
4-3 AA 501A
checkladjust step .. . . .. . ... . . .
4-13
4-4
SMPTE residual intermodulation
distortion checkladjust
.. . . . . .... .. . . . . . 4-15
4-5
Total harmonic SMPTE and CClF distortion
and CClFresidual
IM distortion checkladjust 4-16
4-6 AA 501A
top cover adjustmentsaccess ...
4-19
5-1
Main board rear interface connector
assignments..
. .. .. . ....... . .. .. . . ... 5-3
5-2
Circuit boards and connectors pictorial (top
view).
. . . . . . .. .. . . . ... ... .. ... . . . . .. 5-6
5-3
Latch assembly pictorial
...... .. .. . . .. . 5-7
iii

LIST OF TABLES
Table
No. Page
1-1 ELECTRICAL CHARACTERISTICS . . . . .. 1-2
1-2 ENVIRONMENTAL CHARACTERISTICS
. . 1-7
1-3 PHYSICAL CHARACTERISTICS
. . . . .... 1-7
2-1 Gains from INPUT terminals to FUNCTION
OUTPUT connector for various settings of
the INPUT LEVEL RANGE control
.. ... .. 2-14
3-1 TRUTH TABLE FOR U2042 OUTPUTS
. . . 3-3
3-2 INTERNAL CONNECTIONS IN U1010
DEPENDING ON LOGIC STATES OF PINS
10AND 11
.......................... 3-5
3-3 GAIN AND SWITCHING THROUGH U2031 3-6
3-4 TRUTH TABLE FOR U1021
.. . ... . ..... 3-6
4-1 Suggested Test Equipment
. . ... . . .. .... 4-2
4-2 Common Mode Rejection CHECK
.... .. . 4-9
4-3 Level Function Volts Accuracy
.. .. .. .... 4-9
4-4 Total Harmonic Distortion Accuracy CHECK 4-13
5-1 RELATIVE SUSCEPTIBILITY TO STATIC
DISCHARGE DAMAGE
. . . .. . ..... . .. . .
5-4
5-2 HIGH DISTORTION/NOISE SYMPTOMS
AND PROBABLE CAUSES
.... . ........
5-10

I. ,'
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\.
I
OPERATORS SAFETY SUMMARY
\.
This general safety information is for both operating and servicing personnel. Specific warnings and cautions will be found
throughout the manual where they apply, but may not appear in this summary.
TERMS Grounding the Product
In This Manual
This product is grounded through the grounding conductor
of the power module power cord. To avoid electrical shock,
CAUTION statements identify conditions or practices that
plug the power cord into a properly wired receptacle before
can result in damage to the equipment or other property. connecting to the product input or output terminals. A pro-
tective groundconnection by way of the grounding conduc-
tor in the power cord is essential for safe operation.
WARNING statements identify conditions or practices that
can result in personal injury or loss of life.
Danger Arising From Loss of Ground
As Marked on Equipment
Upon loss of the protective-groundconnection, all accessi-
bleconductiveparts (includingknobs and controls that may
CAUTION indicates a personal injury hazard not immedi-
appear to be insulating) can render an electric shock.
ately accessible as one reads the marking, or a hazard to
property including the equipment itself.
Use the Proper Power Cord
DANGER indicates a personalinjuryhazardimmediatelyac- Use only the power cord and connector specified for your
cessible as one reads the marking. product.
Use only a power cord that is in good condition.
SYMBOLS
Refer cord and connector changes to qualified service
personnel.
In This Manual Use the Proper Fuse
indicates where applicable To avoid fire hazard, use only the fuses specified in the
cautionaryor other information is to be found. parts list for your product, and which is identical in type,
@ Protectiveground (earth)terminal. voltage rating and current rating.
ATTENTION-refer to manual.
0 Refer to manual.
Power Source
Refer fuse replacementto qualified service personnel.
Do Not Operate in Explosive Atmospheres
To avoidexplosion, do not operatethis product in an atmo-
sphere of explosive gases unless it has been specifically
certifiedfor such operation.
This product is designed to operate from a power module
that does not apply more than
250 volts rms between the
Do
Operate Plug-in Unit Without Covers
supply conductors or between either supply conductor and
ground. A protective ground connection by way of the To avoid personal injury, do not operate this product with-
grounding conductor in the power cord is essential for safe out covers or panels installed. Do not apply power to the
operation. plug-in via a plug-inextender.

SERVICING SAFETY SUMMARY
FOR QUALIFIED SERVICE PERSONNEL OM Y
Refer also to thepreceding Operators Safety Summary
Do Not Service Alone Do Not Wear Jewelry
Do not perform internalservice or adjustment of this prod- Remove jewelry prior to servicing. Rings, necklaces, and
uct unlessanother personcapable of renderingfirst aid and other metallic objects could come into contact with danger-
resuscitationis present. ous voltages and currents.
Use Care When Servicing With Power On Power Source
Dangerousvoltages may exist at several points inthis prod- This product is intended to operate from a power module
uct.To avoid personal injury,do not touch exposedconnec- that will not apply more than
250 volts rms between the
tions and components while power is on. supply conductors or between either supply conductor and
ground.
A protective ground connection by way of the
grounding conductor in the power cord is essential for safe
Disconnect power before removing protective panels, sol- operation.
dering, or replacing components.

Section 1-AA 501A
SPECIFICATION
Instrument Description
The AA 501A is a fully automatic distortion analyzer
packaged as a two-wide TM 500 plug-in. Total harmonic
distortion is measuredwith the standard instrument.Option
01 instruments also measure SMPTEIDIN intermodulation
distortion and CClF two-tone difference frequency distor-
tion. In addition, Option 02 instruments permit noise mea-
surements in accordancewith CClR recommendation468-2
or DIN 45405.
Distortion set level, frequency tuning and nulling are fully
automatic, requiring no operator adjustment. Input level
range and distortion measurement rangeselections are fully
automatic or may be manually selected. Distortion readout
is provided in percent or dB.
The AA 501A is also a high sensitivity, autoranging, au-
dio frequency voltmeter. Readingsmay be in volts, dBm, or
dB relativeto any arbitrary reference.
Filters are includedwhich allow measurement of noiseto
IHF and FCC specifications. Option 02 instrumentsprovide
a quasi-peak detector for noise measurements in accor-
dance with CClR or DIN standards. A hum rejectionfilter is
providedas are provisionsfor externalfilters.
All readings are displayed on a
3 112 digit readout. An
uncalibratedanalog readoutis also provided to aid in nulling
and peakingapplications.
Ac to dc conversion is either average or true rms re-
sponding, allowing conformance with most standards. Op-
tion 02 instruements provide quasi-peak or true rms
detection. This feature permits compariston with readings
obtainedon other instruments.
Ac input and output connections are available on both
the front panel and the rear interface. Dc signals, cor-
responding to the displayed reading, are available through
the rear interface. This allows flexibility in interconnection
with other instrumentssuch as filters, chart recorders, spec-
trum analyzers, oscilloscopes, etc.
Performance Conditions
Theelectrical characteristicsinthis specification are valid
only if the AA 501A has been adjusted at an ambient tem-
perature between +20°C and +30°C. The instrument
must be in a noncondensing environment whose limits are
described underthe environment section. Allow twenty min-
uteswarm-uptimefor operationto specified accuracy; sixty
minutes afterexposureto or storagein a highhumidity (con-
densing) environment. Any conditions that are unique to a
particularcharacteristicare expressly stated as part of that
characteristic.
The electrical and environmental performance limits, to-
gether with their related validation procedures, comprise a
completestatementof the electrical and environmental per-
formance of a calibratedinstrument.
ltems listed in the Performance Requirements column of
the Electrical Characteristicsare verified by completingthe
Performance Check in the Calibration section of this man-
ual. ltems listedin the Supplemental Informationcolumn are
not verified in this manual.

Table 1-1
ELECTRICAL CHARACTERISTICS
Characteristics
INPUT (all functions)
Impedance
Input ranges
Maximum input voltage
Common mode rejection
(inputsshorted)
LEVEL FUNCTION
Modes
Accuracy Vi, in
2 100pV
(-78 dBm) with level ranging
indicatorsextinguished
(T<+40°C)
20 Hz to 20 kHz
10 Hz to 20 Hz and 20 kHz to
100kHz
Bandwidth
(nofilters selected)
Supplemental Information
Fulldifferential. Each side ac coupled through 1 pF
and shunted to ground by approximately200 pF.
Dualbananajack connectorsat 0.750 inchspacing
with groundconnector additionally provided.
2-6 sequence from 200 pV to 200 V Range
selectionis manualor automatic. Autoranging time
is typically
< 1 second. Separate increase range
and decrease range indicators illuminatewhenever
input level does not fall within optimumwindow for
selected range.-For specified instrument
performancebothindicatorsmust beextinguished.
300 V peak, 200 V rms either input to ground or
differentially. Will recover without damage from
continuous overloadsof 120 V rrns or 200 V rrns
for 30 minutes on all ranges. For linear response,
peak inputvoltage must notexceed
3 times INPUT
LEVEL RANGE setting.
Typically 240dB to 300 kHz.
Volts, dBm (600 R), or dB ratio with push to set 0
dB reference. lnput rangedetermines display
range. Singleeffective range in dB modes with
0.1
dB resolution. Stored 0 dB referenceis unaffected
by subsequentchanges in mode or function.
Performance Requirement
100 k R k2%,each side to
ground
200 pV to 200 V in 10steps
250dB at 50 or 60 Hz for
common mode signals up to
one-half of selected input
range or 50 mV, whichever is
greater.
VOLTS
Within
k(2%+1
count)
Within
~(4%+2
counts)
dBm OR dB
RATIO
k0.3 dB
k0.5°/o~f
reading
+ 0.5 dB
At least 300 kHz

I
Table 1-1 (cont)
TOTAL HARMONIC DISTORTION
PLUS NOISE FUNCTIONS
I-- (.--
Characteristics
1 Residual noise (Inputs
1 .: shorted, T< +40°C)
I .'
i
20 Hz to 20 kHz
with 80 kHz
noise limiting filter
Performance Requirement
~3.0pV (- 108dBm) with 80
kHz, 400 Hz filters. Standard
and Option01 instruments
only.
el .5 pV(- 114dBm)
with A weighting filter.
Option 02 only. ~5.0pV
(- 104dBm) with CClR
weighting and quasi-peak
response.
Fundamentalfrequency range
Distortion ranges
Accuracy
(THD ~30%and readings
24%of selected distortion
range).
20 Hz to 20 kHz
10 Hz to 100 kHz
ResidualTHD+
N (Vi,
a250 mV, all
distortion, noise,
and nulling error
souces combined, T ~40"C)
10Hz to 50 kHz, no filter
SupplementalInformation
DC 510/DC 5010 radiated magnetic interference
will degrade residual noise above specificationsif
installeddirectly to the left of the AA 501A.
<0.0032% rms Response
(-90 dB)
<0.0025% Average
Response (-93 dB)
10Hz to 100 kHz
Within
2 10% (+ 1 dB) for
harmonics
=G 1 00 kHz.
Within
+ 10% -20% (+ 1dB,
-2 dB) for harmonics
~300kHz
=~0.0071%rms Response
(-83 dB)
Fully automatic tuning and nulling. For proper
tuning THD
+ N 410%. After initialtuning THD + N
candegradeto 30%without lossof lock for SINAD
testing. Typical nullingtime is less than 5 s above
20 Hz.
Auto range, 20°/0, 2%, 0.2%, and dB. dB is
internally autoranging with single effectivedisplay
range. Auto range allows measurements above
20%.
Accuracy is limitedby residual THD
+ N and filter
selection. 100%referencelevel is total input signal
amplitude including distortion and noise
components.
Measuredwith
SG 505 oscillator
50 kHz to 100kHz, no filter
Typicalfundamental rejection
t0.010% rms Response
(-80 dB)
At least 10 dB below specified residual THD+
N or
the actual signal THD, whichever is greater.

Table 1-1 (cont)
Supplemental Information
Fully automatic SMPTE, DIN, or CClF difference
tone tests depending upon actual input signal
whenever respective IMD ~20%.Distortion
ranges are same as THD+N function. Internal
jumper selects Automatic, CCIF, or SMPTEIDIN.
50 Hz to 250 Hz
Useable from 3 kHz to 160kHz
1 : 1 to 4: 1, 1ower:upper
Measuredwith SG 505 pair. <.0025% (-92 dB)
Useable from 4 kHz to 160kHz
80 Hz to 1 kHz
Three pole Butterworth response.
Three pole Butterworth response.
Three pole Butterworth response.
Within specifications for type 1 sound level meters
listed in ANSI S 1.4 1971(revised 1976)and IEC
Recommendation179. Test on 2 V range with
V
approximately equal to 1 V:
100kHz: -19.1 k0.7dB
1 kHz: +0.3
+ 0.4 dB
10kHz: -2.8
+ 1 .O dB
Characteristics
INTERMODULATIONDISTORTION
FUNCTION (OPT 01 and 02)
Operation
SMPTEIDIN tests
Lower frequency range
Upper frequency range
Level ratio range
Residual IMD Vi, 2250mV, 60 Hz,
and 8 kHz, 4:1 amplitude ratio,
T<+40°C
CCIF difference tone test
Frequency range
Differencefrequency range
Minimum input level
ResidualIMD Vi, 2250mV, 14 kHz
and
15 kHz, T6-t40°C
Accuracy (IMD ~20%and readings
24%of selected distortion range)
FILTERS
400 Hz high pass
80 kHz low pass
30 kHz low Pass
A weighting (standardand
Option01 instrumentonly)
Performance Requirement
60 mV(-22 dBm)
Measuredwith SG 505 pair.
60.001
8%) (-92 dB)
Within + 10% (+ 1dB) for IM
components GI kHz
(Accuracy is limitedby
residual IMD and filter
selection.)
-3 dB at 400 Hz k5%; at
least -40 dB rejectionat 60
Hz.
-3 dB at 80 kHz +5%
-3 dB at 30 kHz k5%

Table 1-1 (cont)
Characteristics
CClR WTG (Option02 only)
Externalfilter
FRONT PANEL SIGNALS
lnput Monitor
Vin 250mV
Vin ~50mV
Function Output
Signal
Impedance
Auxiliary lnput
Sensitivity
Maximum Input Voltage
Impedance
REAR INTERFACE SIGNALS
Rear interfaceinput
Input monitor
Performance Requirement
Selects front panel
AUXILIARY INPUT allowing
connectionof external filter
between it and FUNCTION
OUTPUT.
1V rms
+ 10%(10 Hz to
100kHz)
1 V, +3%, for 1000 count
volts or
O/O display
1 kfl, +5%
1 V, + 3%, for 1000 count
volts or
% display
100
kQ, +5%
Supplemental Information
Within specificationsof CClR recommendation
468-2 and DIN45405 for noisemeasurementswith
quasi-peak detector. Rms detector calibration
shifted for 0 dB at 2.00 kHz instead of 1 .OO kHz.
Test on 2 V range with Vin 0.4 V: with quasi-peak
response.
1 kHz:O.O dB k0.2 dB also test with Vin set for
+ 12.2dB at 6.3 kHz:
100 HZ: -1 9.8 dB +0.7 dB 1 kHz: 0.0 dB
+ 0.4 dB
10kHz: +8.1 dB k0.7dB 20 kHz: -22.2 dB
k1.5dB
Constant amplitude (averageresponse)verison of
differentialinput signal. THD is typically
=sO.OOIOO/~
(- 100dB) from 20 Hz to 20 kHz. Settlingtime is
~1.5seconds.
Approximately 20 times input signal.
Selected and filtered ac signal actually measured.
Loopthrough accuracy from FUNCTION OUTPUT
is
k 3%.
15 V peak, 6 v peak for linear response.
Ac coupled.
Pins28B (+), 28A (-), 278 and 27A (common)are
front panel selectable and independentof main
front panel input. All characteristicsare the same
as main INPUT except maximum input voltage is
limitedto 42 V peak, 30 V rms. Due to potential
crosstalk at the rear interface, noise and distortion
performance may be degraded.
Pins 24A and 23A (gnd) same as front panel
INPUT MONITOR

fable 1-1 (cont)
Supplemental Information
Pins 23B and 248 (gnd)same as front panel
FUNCTION OUTPUT.
Pins 25B and 266 (gnd) same as front panel
AUXILIARY INPUT. Maximum input voltage is 15
V peak, 6 V peak for linear operation.
Pins 20A and 19A (gnd). Dc output of the selected
ac to dc converter. 1 V
+ 5% for 1000count
display with 500
Q k5%source resistance.
Pins 19B and 208 (gnd). Dc output of the
logarithmic dB converter. 10 mV
-t 5%equals 1dB
of display with 1 kQ
+ 5% source resistance.
Changes in levelor distortion rangewill causebrief
ac transients.
True rms detection
Average detection, rms calibratedfor sinewaves.
Typically reads 1 to 2 dB lower than true rms
detectionfor noise, THD+ N, and IMD
measurements.
Quasi-peak detection, rms calibrated for
sinewaves. Within specifications of CClR
Recommendation468-2 and DIN 45405. Due to
the peak hold natureof its response readings,
considerably higher than rms response will occur
with large crest factor signals (such as noise). The
input range indicators should be ignored and
auto-ranging avoided with these types of signals.
Test on
2 V range at Vin 1.0 V. Readingwith 10Hz
repetitionrate
1 cycle tone bursts of 200 Hz
triggeredat 0" phase, shall be -2.3 dB + 0.3 dB
referencedto same amplitude continuous 200
Hz
signal.
Characteristics
Function output
Auxiliary input
Acldc converter output
dB converteroutput
DETECTORS AND DISPLAYS
Detectors(Response)
RMS
AVG (standardand Option 01
only)
Quasi-peak (Option02 only)
Displays
Digital
Analog bar graph
Performance Requirement
3 112 digit, 2000 count LED.
Overrangeindication is 1,
blank, blank, blank.
10 segment LED intensity
modulated bar graph display
of digital readout. Segments
are logarithmically activated
with approximately 2.5
dB/segment.

Table 1-1 (cont)
Supplemental Information
Approximately24 watts.
Nominally + 15.1 V +3%
Nominally -15.1 V + 5%
Nominally +5.25 V + 5%
3 AG, 1 A, 250 V, fast blow
3 AG, 1 A, 250 V, fast blow
3 AG, 1.5 A, 250 V, fast blow
2000 hours or 12months, whichever occurs first.
20 minutes; 60 minutes after storage in high
humidity environment.
6000 hours.
Characteristics
MISCELLANEOUS
Power consumption
Internalpower supplies
+15
-15
+5
Fuse data
F4060
F4061
F4062
Recommendedadjustment interval
Warm-up time
MTBF
Performance Requirement

Table 1-2
ENVIRONMENTAL CHARACTERISTICS
aWith TM 50015000-Series power moduel. System performancesubject to exceptions of power module or other individual plug-ins.
bRefer to TM500/5000 power module specifications.
=Requirespower module retainer bar or clip.
Characteristics
Temperature
Operating
Non-operating
Humidity
Altitude
Operating
Non-operating
Vibration
Shock
Bench Handling
(plug-inonly)
Package Product Vibration
and Shock (Plug-inonly)
Electromagnetic
Susceptibility
ElectromagneticInterference
ElectrostaticImmunity
Description
0°C to +50°C
-40°C to +75"C
95% RH, 0 to +30°C
75% RH, to +40°C
45% RH, to +50°C
4.6 km (15,000 ft)
15 km (50,000 ft)
0.38 mm (0.015") peak to peak,
5 Hz to 55 Hz, 75 minutes.
30 g's (112 sine), 11ms duration,
3 shocks in each direction along
3 major axes, 18 total shocks.
12drops from
45", 4" or
equilibrium, whichever occurs
first.
Meets MIL-T-28800C, class 5.
Meets MIL-T-28800C, class 5.
Exceeds MIL-T-28800C, class 5.
MeetsMIL-T-28800C,class 5, when installedinqualified
power modu1es.b
MeetsMIL-T-28800C,class 5, when installed in qualified
power modu1es.b
C.
Meets MIL-T-28800C, class 5.
Qualified under National Safe Transit Association PreshipmentTest Procedures 1
A-B-1 and
1A-8-2.
Within limits of MIL-STD-461B (April 1, 1980)Class B.
Within limits of F.C.C. Regulations, Part 15, Subpart
J, Class A; VDE 0871 category B, VDE
0875; and MIL-STD-461B (April 1,1980) Class
B
At least 15 kV discharge from 500 pF in series with 100 fl to instrumentcase or any front
panel connector without damage or permanent performance degradation (Input terminals
limitedto 10kV).

Table 1-3
PHYSICALCHARACTERISTICS
Characteristics
Maximum Overall Dimensions
Height
Width
Length
Net Weight
Finish
Front Panel
Chassis
Description
126.0 mm (4.96 inches)
131.2 mm (5.16 inches)
285.5 mm
(1 1.24 inches)
Approximatelyequal to 2.04 kg (4.5 Ibs.)
Plastic-aluminumlaminate
Anaodized aluminum

Section 2AA 501A
OPERATING INSTRUCTIONS
Preparation For Use
The AA 501A is calibrated and ready for use when re-
ceived. It operates in any two compartments of a
TM 500lTM 5000-Series power module. See the power
module instruction manual for line voltage requirementsand
power module operation. Figure
2-1 shows the AA 501A
installation and removal procedure.
Turn the power module off before inserting the AA
501A. Otherwise,arcing may occur at the rear inter-
faceconnectors,reducing their useful life and damage
may result to theplug-in circuitry.
Check to see that the plastic barriers on the intercon-
necting jack of the selected power module compartment
match the cutouts in the AA 501A circuit board edge con-
nector. Align the AA 501A chassis with the upper and lower
guides of the selected compartment. Press the AA 501A in,
to firmly seat the circuit board in the interconnectingjack.
To remove the AA 501A pull the release latch (located in
the lower left corner) until the interconnecting jack disen-
gages and the AA 501A slides out.
Check that the AA 501A is fully inserted in the power
module. Turn the power module power switch ON. One or
more characters in the
LED display should now be visible.
Repackaging Information
If the Tektronix instrument is to be shipped to a
Tektronix Service Center for service or repair, attach a tag
showing the owner (with address) and the name of an indi-
Fig. 2-1. Installation and removal.

vidual at your firm that can be contacted. Include the com-
plete instrument serial number and a description of the
service required.
Save and reuse the package in which your instrument
was shipped. If the original packaging is unfit for use or not
available, repackage the instrument as follows:
Surround the instrument with polyethylene sheeting to
protect the finish of the instrument. Obtain a carton of
corrugatedcardboard of the correct carton strength and
having inside dimensionsof no less than six inches more
than the instrumentdimensions. Cushion the instrument
by tightly packing three inches of dunnage or urethane
foam between carton and instrument on all sides. Seal
the carton with shipping tape or an industrialstapler.
The carton test strength for this instrument is 200
pounds per square inch.
Controls, Connectors, and Indicators
All controls, connectors and indicators (except for the
rear interface connector) required for operation of the AA
501A are locatedon the front panel. Fig. 2-2 provides a brief
description of all front panel controls, connectors, and
indicators.
a INPUT RANGE
Selects input voltage range or AUTORANGE. The
three most sensitive ranges operate in the LEVEL
FUNCTION only.
R DECREASE RANGE A
w
When this light is illuminated, reduce the INPUT
LEVEL RANGEuntilthe light goes out. If the FUNC-
TION selected is THD+N or IMD (on Option 01 or
02 instruments)a flashing light indicates insufficient
input signal level for distortion measurements.
@ INCREASE RANGE
When this light is illuminated, increase the INPUT
LEVEL RANGE until the light goes out.
@ + INPUT
Differentialinputterminal. Positivegoing inputsignal
provides positive going output signal at INPUT
MONITOR.
@ - INPUT
Differential input terminal. Negative going input sig-
nal provides positive going output at INPUT
MONITOR.
@ Release Latch
j
@ LEVEL
Button in selects input level measuringfunction.
!
@ VOLTS
Button in selects voltage units for level function.
@ dBm 600 SI
Button in selects dBm units for level function. 0 dB
j
,
reference is 0.7746 V corresponding to 1 mW into
I
600 a.
@ dB RATIO
I
,
Button in selects dB ratio, with respect to preset
level, as units for level function.
I
@ PUSH TO SET 0 dB REF
Pushbutton to set display to 0 with input signal ap-
! I,
plied to INPUTterminals in LEVELfunction. dB RA-
i
TI0 and LEVEL pushbuttons must be in for this
feature to operate.
i
!
@ REAR INTFC-INPUT
Button in selects rear interfaceinput; button out se-
I
lectsfront panel input. \, 1
@ RESPONSE
i
i
Button ingives RMS detection(respondsto the rms
!
value of the input waveform). Buttonout gives aver-
age detectionor quasi-peak detection (option02 in-
struments)both are rms calibratedfor sinewaves.
f I
@ THD+N
Button in selects total harmonic distortion function.
1
@ IMD (Option 01 and 02 only)
1
Button inselects intermodulationdistortion function.
I
@ AUTO RANGE
Button in selects automatic distortion range selec-
tion (0.2% to 100%full scale).
1
(l7J 20%
Button inselects full scale distortion readout of 20%
'1
with 0.01 O/O resolution.
(' '