HP 334A, 333A Service manual
TM 11-6625-1576-15
DEPARTMENT OF THE ARMY TECHNICAL MANUAL
ORGANIZATIONAL, DS, GS, AND DEPOT
MAINTENANCE MANUAL
DISTORTION ANALYZER
HEWLETT-PACKARD MODELS
333A AND 334A
HEADQUARTERS, DEPARTMENT OF THE ARMY
MAY 1967
TM 11-6625-1576-15
Be careful when working on the power supply and
on the 115-volt ac line connections.
WARNING
DANGEROUS VOLTAGES
EXIST IN THIS EQUIPMENT
DO NOT TAKE CHANCES
!
This manual contains copyrighted material originally
prcpared by the Hewlett-Packard Co.
TM11-6625-1576-15
TECHNICAL MANUAL
NO. 11-6625-1576-5 )
Organizational, DS, GS, and Depot Maintenance
DISTORTION ANALYZER, HEWLETT-PACKARD MODELS 333A AND 334A
Section
I GENERAL INFORMATION . . . . . . . . . 1-2.1
1-A.1 Scope . . . . . . . . . . . . . . . . .1-2.1
Index of Publications. . .
l-A.2
Forms and Records . . . . . . . . . . .
l-A.3
l-1. Description . . . . . . . .1-3
1-6. Accessory Features . . . . . . . .1-3
1-8. Options Available . . . . . . . . .1-3
1-11. Modifications
Section
INSTALLATION . . . . . . . . . . . . . .2-1
II
2-1. Introduction . . . . . . . . . . . . . .2-1
2-3. Inspection . . . . . . . . . . . . . . 2-1
2-5. Power Requirements . . . . . . . . . . 2-1
2-7. Three-Conductor Power Cable . . . 2-1
2-10. Installation . . . . . . . . . . . . . . 2-1
2-12. Bench Installation . . . . . . . . . 2-1
2-14. Rack Installation . . . . . . . . . . 2-1
2-16. Repackaging for Shipment . . . . . . 2-1
Section
OPERATING INSTRUCTIONS . . . . . . . 3-1
III
3-1. Introduction . . . . . . . . . . . . . 3-1
3-4. Controls and Indicators . . . . . . . 3-1
3-6. Adjustment of Mechanical Zero . . . 3-1
3-8. General Operating Information . . . 3-1
Input Connections . . . . . . . . . 3-1
3-9.
3-11. Voltmeter Characteristics . . . . . 3-1
3-14. Use of Output Terminals . . . . . . 3-1
3-16. Operating Procedures . . . . . . . . 3-2
3-18. Distortion Measurement . . . . . . 3-2
Section
IV
THEORY OF OPERATION . . . . . . . . . . 4-1
4-1. Overall Description . . . . . . . . 4-1
4-3. Block Diagram Description . . . . . 4-1
4-4. Distortion Measuring Operation . . 4-1
4-6. Distortion Measurement in AM
.
4-8. Voltmeter Operation . . . . . . . . 4-1
4-10. Schematic Theory . . . . . . . . . . 4-1
4-11. Impedance Converter Circuit . . . 4-1
4-14. Rejection Amplifier Circuit . . . . 4-2
4-36. High Pass Filter . . . . . . . . . . . 4-5
4-38. Meter Circuit . . . . . . . . . . . . 4-5
4-46. Power Supply Circuit . . . . . . . . . . 4-7
4-51. RF Detector Circuit (334A only) . l 4-7
Carriers . . . . . . . . . . . . . 4-1
. . . . . . . . . . . . . . . . . . . . . . . . 1-3
)
)
Page
1-2.1
1-2.1
Page
Page
Page
HEADQUARTERS
DEPARTMENT OF THE ARMY
Washington, D.C., 19
Section V (Cont ‘d)
5-9. Fundamental Rejection Check . .
5-10. Second Harmonic Accuracy Check
5-11. Distortion Introduced by Instru-
5-12. Frequency Calibration Accuracy
5-13. Input Resistance Check . . . . . .
5-14. Input Shunt Capacitance Check . .
5-15. Minimum Input Level Check . . .
5-16. DC Isolation Check . . . . . . . .
5-17. Voltmeter Accuracy Check . . . .
5-18. High Pass Filter Check . . . . . .
5-19. Voltmeter Frequency Response
5-20. Residual Noise Check . . . . . . .
5-21. AM Detector Check (Model 334A
5-22. Adjustment and Calibration
5-25. Meter Mechanical Zero Set . . . .
5-27. Power Supply and Bias
5-28. A3R16 and A3R30 Distortion
5-29. Bridge Balance Adjustment (C3) .
5-30. Voltmeter Gain Adjustments . . .
5-31. Voltmeter Frequency Response
5-32. Sensitivity Switch Calibration . . .
5-33. Troubleshooting Procedures . . . .
5-39. Bottom Shield Removal . . . . . .
5-41. Servicing Etched Circuit Boards .
5-44.
Section
VI
SCHEMATIC DIAGRAMS
6-1. Schematic Diagrams
ment Check and Automatic
Control Loop Operation . . . .
Check . . . . . . . . . . . .
Check . . . . . . . . . . . . . . . .
only) . . . . . . . . . . . . . . .
Procedure. . . . . . . . . . . . . . .
Adjustments. . . . . . . . . . .
Adjust. . . . . . . . . . . . . .
Adjustment . . . . . . . . . . .
Servicing Rotary Switches . . . .
May 1967
Page
5-1
5-2
5-2
5-3
5-4
5-4
5-4
5-4
5-5
5-5
5-6
5-6
5-6
5-7
5-7
5-7
5-9
5-9
5-10
5-10
5-10
5-11
5-11
5-11
5-13
Page
6-1
6-1
Section Page
V MAINTENANCE. . . . . . . . . . . . . 5-1
5-l. Introduction. . . . . . . . . . . 5-1
5-2. Test Equipment Required . . . . . 5-1
5-5. Performance Checks. . . . . . . . . 5-1
iii
Model 333A/334A
TM 11-6625-1576-15
Section 1
Figure 1-1 and Table 1-1
Figure 1-1. Model 333A Distortion Analyzer
Table 1-1. Specifications
1-1
TM 11-6625-1576-15
Section I
Table 1-1
Model 333A/334A
Table 1-1. Specifications (Cont ‘d)
1-2
TM 11-6625-1576-15
SECTION I
GENERAL INFORMATION
1-A.1 Scope
This manual includes installation and operation instructions and
covers operator’s, organizational, direct support (DS), general support
(GS), and depot maintenance. It describes Hewlett-Packard (Federal support
Code 80537) Distortion Analyzer Models 333A and 334A (fig. l-l). A
basic issue items list for this equipmnent is not included as part of
this manual.
1-A.2 Index of Publications
Refer to the latest issue of DA Pam 310-4 to determine whether there
are new editions, changes, or additional publications pertaining to the
equipment. DA Pam 310-4 is an index of current technical manuals,
technical bulletins, supply manuals (types 7, 8, and 9), supply bulletins,
lubrication orders, and modification work orders that are available through
publications supply channels. The index lists the individual parts (-10,
-20, - 35P, etc) and the latest changes to and revisions of each equipment
publication.
l-A.3 Forms and Records
a. Reports of Maintenance and Unsatisfactory
ment forms and records in accordance with instructions in TM 38-750.
b. Report of Damaged or Improper Shipment. Fill out and forward
DD Form 6 (Report of Damaged or Improper Shipment) as prescribed in
AR 700-58 (Army), NAVSANDA Publication 378 (Navy), and AFR ‘71-4
air Force).
c. Reporting of Equipment Manual Improvements. Report of errors,
omissions, and recommendations for improving this manual by the
individual user is encouraged.
2028 (Recommended Changes to DA Publications) and forwarded direct
to Commanding General, U. S. Army Electronics Command,
ATTN: AMSEL-MR-NMP-AD, Fort Monmouth, New Jersey 07703.
Reports should be submitted on DA Form
Equipment. Use equip-
1-2.1
TM 11-6625-1576-15
Model 333A/334A
1-1. DESCRIPTION.
1-2. The Hewlett-Packard Models
Distortion Analyzers are solid state
measuring distortion and ac voltages.
333A and 334A include two control loops that automatically tune both legs of a bridge circuit which re -
jects the fundamental when the rejection circuit is
initially set within the range of the loops. A high im pedance detector which operates from 500 Kc to greater
than 65 Mc provides the capability” of monitoring the
distortion of the amplitude modulation on an rf carrier.
1-3. Distortion levels of O. 1% to 1OO% full scale are
measured in seven ranges for any fundamental fre quency of 5 cps to 600 Kc.
to 3Mc. The high sensitivity of these instruments requires only O. 3 v rms for the 100% set level reference.
The distortion characteristics can be monitored at the
OUTPUT connectors with an oscilloscope, a true rms
voltmeter, or a wave analyzer. The instruments are
capable of an isolation voltage of 400 volts above chassis
ground.
1-4. The voltmeter can be used separately for general
purpose voltage and gain measurements. It has a fre quency range of 5 cps to 3 Mc (20 cps to 500 Kc for 300
pv range) and a voltage range of 300 pv to 300 v rms
full scale.
1-5. The AM detector included in the Model 334A is
a broadband dc restoring peak detector consisting of a
semiconductor diode and filter circuit. AM distortion
levels as low as O. 3% can be measured on a 3 v to 8 v
rms carrier modulated 30% in the standard broadcast
Harmonics are indicated up
333A and 334A
instruments for
The Models
Paragraphs l-l to l-13
Section I
band, and lower than 1% distortion can be measured
at the same level of the carrier up to 65 Mc.
1-6. ACCESSORY FEATURES.
1-7. The accessory available with the 333A and 334A
Distortion Analyzers is a voltage divider probe, -hpModel No. 1000lA. The features of the probe are:
a. 10 megohms shunted by 10 pf, giving 10:1
attenuation.
b. DC to 30 Mc bandwidth.
c. 2% division accuracy.
d. 600 v peak input.
e. 5 ns rise-time.
1-8. OPTION.
1-9. Option 0l is a standard -hp- Model 333A or 334A
with a special meter and meter amplifier, compen-
sated to permit response to VU (volume units)
characteristics.
1-11. Modifications
1-12, Specification C10-334A is a standard
334A Distortion Analyzer modified by placing
the INPUT and OUTPUT terminals on the rear
panel of the instrument. The rear terminals
are binding post connectors and are in
parallel with the front panel terminals.
Due to the rear terminal leads, the shunt
capacitance of the instrument is increased
by 20pF .
1-3
TM 11-6625-1576-15
Model333A/334A
Paragraphs 2-1 to 2-19
SECTION II
INSTALLATION
Section II
2-1. INTRODUCTION.
2-2. This section contains information and instructions necessary for the installation and shipping of the
Models 333A/334A Distortion Analyzers. Included
are initial inspection procedures, power and grounding
requirements,installation information, and instruc tions for repackaging for shipment.
2-3. INSPECTION.
2-4. This instrument was carefully inspected both
mechanically and electrically before shipment. It
should be physically free of mars or scratches and in
perfect electrical order upon receipt. To confirm
this, the instrument should be inspected for physical
damage in transit. Also check for supplied accessories,
and test the electrical performance of the instrument
using the procedure outlined in Paragraph 5-5.
2-5. POWER REQUIREMENTS.
2-6. The Model 333A/334A can be operated from any
ac source of 115 or 230 volts (+10%), at 50- 1000 cps.
With the instrument disconnected from the ac power
source, move the slide (located on the rear panel) un-
til the desired line voltage appears. The instrument
can be battery operated by connecting two 28-50 V
batteries (rated 80 milliamperes) to the battery ter-
minal on the rear panel. Power dissipation is 10 watts
maximum.
2-7. THREE-CONDUCTOR POWER CABLE.
2-8. To protect operating personnel, the National
Electrical Manufacturers’ Association (NEMA) recom-
mends that the instrument panel and cabinet be grounded.
All Hewlett-Packard instruments are equipped with a
three -conductor power cable, which when plugged into an appropriate receptacle, grounds the instrument
The offset pin on the power cable three-prong connec-
tor is the ground wire.
2-9. To preserve the protection feature when operat-
ing the instrument from a two-contact outlet, use a
three-prong to two-prong adapter and connect the
green pigtail on the adapter to ground.
2-10. INSTALLATION.
2-11 The Model 333A/334A is fully transistorized;
therefore, no special cooling is required. However,
the instrument should not be operated where the ambient temperature exceeds 55 C (191 F).
2-12. BENCH INSTALLATION.
2-1% The Model 333A/34A is shipped with plastic
feet and tilt stand in place, ready for use as a bench
instrument.
2-14. RACK INSTALLATION.
2-15. The Model 333A/334A may be rack mounted by
using the 5“ RackMount Kit (-hp- Part No. 5060-0775).
Instructions for the conversion are included with the
The rack mount for the Model 333A/334A is an
kit.
ELA standard width of 19 inches. when mounted in a
rack using the rack mount kit, additional support at
the rear of the instrument should be provided if vibra
tion or similar stress is likely.
2-16. REPACKAGING FOR SHIPMENT.
2-17. The following paragraphs contain a general guide
for repackaging of the instrument for shipment. Refer
to Paragraph 2-18 if the original container is to be
used; 2-19 if it is not.
2-18. If original container is to be used, proceed as
follows:
a. Place instrument in original container if avail-
able.
b. Ensure that container is well sealed with strong
tape or metal bands.
2-19. If original container is not to be used, proceed
as follows:
a. Wrap instrument in heavy paper or plastic be-
fore placing in an inner container.
b. Place packing material around all sides of in-
strument and protect panel face with cardboard strips.
c. Place instrument and inner container in a heavy
carton or wooden box and seal with strong tape or
metal bands.
d. Mark shipping container with “DELICATE
INSTRUMENT," "“RAGILE,” etc.
2-1
TM 11-6625-1576-15
Section III
Figure 3-1
Model 333A/334A
3-0
Figure 3-1. Front and Rear Panel Description
TM 11-6625-1576-15
Model 333A/334A
Paragraphs-3-l to 3-15
Section III
SECTION III
OPERATING INSTRUCTIONS
3-1. INTRODUCTION.
3-2. The Models 333A and 334A Distortion Analyzers
measure total harmonic distortion from 5 cps to 600
Kc. Harmonics up to 3 Mc are included. The sharp
elimination characteristics, >80 db, the low level of
instrument induced distortion, and the meter accuracy
of the 333A and the 334A result in accurate measurement of low level harmonic content in the input signal.
3-3. An RMS voltmeter is inherent in the 333A and
334A, The voltmeter provides a full scale sensitivity
of 300 u volts rms (residual noise <25 u volts). The
voltmeter frequency range is from 5 cps to 3 Mc except on the 0. 0003 volt range, which is from 20 cps to
500 Kc.
3-4. CONTROLS AND INDICATORS.
3-5. Figure 3-1 illustrates and describes the function
of all front and rear panel controls, connectors, and
indlcators.
keyed to a drawing included within the figure.
3-6. ADJUSTMENTS OF MECHANICAL ZERO.
3-7. The procedure for adjustment of mechanical
zero is given in Section V, Paragraph 5-25.
3-8. GENERAL OPERATING INFORMATION.
3-9. INPUT CONNECTIONS.
3-10. Signal source can be connected to the 333A and
334A through twisted pair leads or a shielded cable
with banana plug connectors. Keep all test leads as
short as possible to avoid extraneous pickup from
stray ac fields,
battery operation is recommended to avoid ground
loops.
by connecting only one instrument in a test setup
directly to power line ground through a NEMA (threeprong) connector,
the power source through a three-prong to two-prong
adapter and leave the pigtail disconnected. Both the
333A and 334A have a dc isolation of ±400 vdc from
the external chassis with the shorting bar, (item 16 ,
Figure 3-1), disconnected.
3-11. VOLTMETER CHARACTERISTICS.
9-12. The RMS VOLTS markings on the meter face are
based on the ratio between the average and effective
(rms) values of a pure sine wave. The ratio of aver-
age to effective values in a true sine wave is approxi-
mately O. 9 to 1.When the meter is used to measure
complex waves,
rms value of the signal applied. This deviation of
meter indication exists because the ratios of average
to effective values are usually not the same in a com plexwave as in a sine wave. The amount of deviation
depends on magnitude and phase relation between
harmonics and fundamental frequency of the signal
The description of each component is
When measuring low-level signals,
Another method for avoiding ground loops is
Connect all other instruments to
the voltage indicated may not be the
applied. Table 3-1 shows the deviation of the meter
indication of a sine wave partly distorted by harmonic..
As indicated in the table, harmonic content of less
than approximately 10% results in very small errors.
Table 3-1
Effect of Harmonics on Voltage Measurements
Input Voltage True
Characteristic
Fundamental = 100
Fundamental +10% 100. s
2nd harmonic
Fundamental +20%
2nd harmonic
Fundamental +50%
2nd harmonic
Fundamental +10%
3rd harmonic
Fundamental +20%
3rd harmonic
Fundamental +50%
3rd harmonic
This chart is universal in application
since time errors are inherent in
all average-responding type voltagemeasuring instruments.
3-13. In distortion measurements where the fundamental frequency is suppressed and the remainder of the
signal is measured, the reading obtained on an average-
responding meter may deviate from the true total rms
value. When residual wave contains many inharmonically related sinusoids, the maximum error in the distortion reading is about 11% low for distorilon levels
below 10%.
Measured Maximum Error Total
Distortion In Meter Indication Distortion
2. 5%
This example represents the maximum possible error,
and in most cases the error is less. In distortion
measurements, the reading of an average-responding
meter is sufficiently close to the rms value to be
satisfactory under most measurement conditions.
3-14. USE OF OUTPUT TERMINALS.
3-15. The OUTPUT terminals provide a O. 1 v rms
output for full scale meter deflection
minals can be used to monitor the output signal with
an oscilloscope,
analyzer. The combination of the distortion meter
and oscilloscope provides more significant information
+0. 11 X O. 025 =
0.00027
RMS Value
100 100
102
112
100.5
102
112
NOTE
a true rms voltmeter, or a wave
Meter
Indication
100
100-102
100-110
96-104
94-108
90-116
0.025 +0. 0027 =
0.0277 or 2.8%
These ter-
3-l
TM 11-6625-1576-15
Section III
Paragraphs 3-16 to 3-22
about the device under test than the expression of dis-
tortion magnitude alone.
Information obtained from
the oscilloscope pattern is specific and reveals the
nature of the distortion that sometimes occurs at such
low levels that it is difficult to detect in the presence
of hum and noise.
The impedance at the OUTPUT
terminals is 2000 ohms, therefore, capacitive loads
greater than 50 pf should ‘be avoided to maintain the
accuracy of meter readings.
3-16. OPERATING PROCEDURES.
3-17. The 333A and 334A Distortion Analyzers can be
operated from an ac power source ( 115/230 volt) or a
dc power source (+28 to +50 and -28 to -50 volt source).
If a dc source is used, check the -25 v output. If
necessary, adjust the power supply according to the
procedures in Paragraph 5-27.
3-18. DISTORTION MEASUREMENT.
3- 19. DISTORTION MEASUREMENT IN PERCENT,
AUTOMATIC MODE.
a. Position FUNCTION selector to SET LEVEL.
b. Position MODE switch to MANUAL.
c. If fundamental frequency is 1 Kc or greater,
position HIGH PASS FILTER SWITCH to IN.
d. Rotate SENSITIVITY selector to MIN position.
NOTE
The bandwith of the SENSITIVITY se-
lector is reduced in the two extreme
CCW positions (positions used with an
input signal greater than 30 v).
e. Position METER RANGE selector to SET LEVEL
100%).
f. Connect test leads from device under test to
INPUT terminals.
REMOVE SHORTING STRAP BETWEEN
FLOATING GROUND ~ AND CHASSIS
GROUND (+) TERMINALS ON FRONT
PANEL INPUT TERMINALS WHEN
MEASURING DISTORTION BETWEEN
TWO POINTS WHICH ARE BOTH ABOVE
GROUND POTENTIAL.
g. With SENSITIVITY VERNIER control max. CCW,
position SENSITIVITY selector for meter indication
greater than 1/3 full scale.
NOTE
If unable to adjust for full scale deflection which indicates input signal is be-
low O. 3 volts, use manual mode and
position METER RANGE selector down-
scale. Use this new position as the 100%
SET LEVEL position, thus making the
next range 30%, etc.
h. Adjust SENSITIVITY VENIER control for full
scale deflection.
j. Position FRIQUENCY RANGE selector and
frequency dial to fundamental frequency of input signal.
3-2
Model 333A/334A
k. Position FUNCTION selector to DISTORTION,
m. Adjust METER RANGE selector and frequency
dial vernier control for minimum meter indication.
n. Adjust COARSE and FINE BALANCE controls
for further reduction of meter indication. Meter indication must be less than 10%of SET LEVEL indication.
p. Position MODE switch to AUTOMATIC.
r. Observe percentage of distortion indicated on
meter. Meter indication is in conjunction with METER
RANGE selector. For example, if meter indicates
.4 and METER RANGE selector is on 1% position,
distortion measured is 0.4%.
NOTE
RMS voltage of input signal being analyzed for distortion can be measured
by positioning FUNCTION selector to
VOLTMETER position.
DISTORTION MEASUREMENT IN PERCENT,
3-20.
MANUAL MODE.
NOTE
In MANUAL mode the accuracy of dis tortion measurements is affected by
frequency stability of the input signal.
An inaccuracy in distortion indications
occure when the frequency drift of the input signal exceeds the bandwidth of the
rejection curve.
Perform steps a through n in Paragraph 3-19.
a.
Repeat steps m and n until no further reduction
b.
in meter
-
indication can be obtained.
c. Observe percentage of distortion indicated on
meter.
3-21. DISTORTION MEASUREMENT IN DB,
AUTOMATIC MODE .
a. Perform steps a through g of Paragraph 3-19.
b. Adjust SENSITIVITY VERNIER control for 0 db
meter indication.
c. Perform steps j through 3-19.
d. Observe meter indication for distortion in db.
NOTE
Distortion in db is obtained by algebraically adding meter indication to
db indicated by METER RANGE se-
lector: for example, If meter indicates -2 and METER RANGE selector is on -20 db position, distortion
measured is -22 db.
3-22. DISTORTION MEASUREMENT IN DB, MANUAL
MODE .
NOTE
Notes in Paragraphs 3-20 and 3-21
apply.
a. Perform steps a through g of Paragraph 3-19.
b. Adjust SENSITIVITY VERNIER control for O db
meter indication.
Model 333A/334A
c. Perform steps j through n of Paragraph 3-19.
d. Repeat steps m and n until no further reduction
n meter indication can be obtained.
e. Observe meter indication for distortion in db.
3-23. DISTORTION MEASUREMENT OF AM RF
CARRIERS. (334A Only)
a. Set NORM - RF SET selector to RF SET.
OBSERVE MAXIMUM INPUT VOLTAGES
AS INDICATED ON REAR PANEL.
b. Connect Input to RF INPUT on rear panel.
c. Adjust SENSITIVITY VERNIER control for O db
meter indication.
d. Perform steps j through n of Paragraph 3-19.
e. Refer to Paragraph 3-20 for manual measure-
ment in percent.
TM 11-6625-1576-15
Paragraphs 3-23 to 3-27
3-25. The 333A and 334A perform as general purpose
AC Voltmeters when the FUNCTION selector is set
to VOLTMETER position.
NOTE
With the FUNCTION selector in VOLT-
METER position, the SENSITIVITY selector is disabled.
a, Position METER RANGE selector to a range
exceeding the value of the signal to be measured.
b. Connect signal to INPUT terminals.
c. Select a METER RANGE to give a reading as
close to full scale as possible and observe meter
indication.
3-26. OUTPUT TERMINALS.
3-27. In VOLTMETER or SET LEVEL position of
FUNCTION selector, the 333A/334A can be used as a
low distortion, high gain, wideband preamplifier. A
portion of the meter input (O. 1 v RMS output for full
scale meter deflection) is provided at the OUTPUT
terminal J2. In the DISTORTION position, the distor-
tion is provided for monitoring purposes.
Section III
the
f. Refer to Paragraph 3-21 and 3-22 for automatic
and manual measurement in db.
-24. VOLTMETER MODE.
NOTE
If DBM measurements are to be made,
the DB markings on the METER RANGE
switch must each be lowered by 10.
That is, the DB marking for the O. 3 v
range becomes-10 DBM, 1 v range becomes O DBM, 3 v range becomes +10
DBM etc. If the other DB markings are
used, the DBM readings will be 10 DBM
high.
DO NOT EXCEED THE VOLTAGES
LISTED BELOW TO PREVENT BLOWING
FUSE F2:
VOLTMETER.= -1 V RANGE
AND BELOW, AND DISTORTION
ANALYZER, MODE-MAXIMUM
SENSITIVITY.
1. 300 V ABOVE 100 CPS
2. 50 V ABOVE 1 KC
IF LOW FREQUENCIES ARE NOT TO
BE MEASURED, Cl MAY BE REPLACED
WITH A SMALLER CAPACITOR, AND
THE VOLTAGE LIMITS OF F2 MAY BE
RAISED ACCORDINGLY.
3-3
TM11-6625-1576-15
Section IV
Figure 4-1
Model 333A/334A
Figure 4-1. Block Diagram
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