HEWLETT-PACKARD ZM-74 Vector, 4800A Impedance Meter, 4801 Plug-in TECHNICAL MANUAL

TECHNICAL MANUAL

OPERATOR'S, ORGANIZATIONAL, DIRECT SUPPORT AND

GENERAL SUPPORT MAINTENANCE MANUAL

INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS

TM 11-6625-2851-14&P

FOR

IMPEDANCE METER: VECTOR ZM-74/U

(HEWLETT-PACKARD MODEL 4800A WITH MODEL 4801

PLUG-IN) (NSN 6625-00-167-9861)

HEADQUARTERS, DEPARTMENT OF THE ARMY

2 SEPTEMBER 1981

TM 11-6625-2851-14&P

WARNING

Use this equipment only on power receptacles which are provided with protective grounding. For receptacles which are not provided with the grounding insert, use the three prong adapter recommended in Section II of the manual.

TM 11-6625-2851-14&P

This manual contains copyright material reproduced by permission of the HEWLETT-PACKARD Company.

TECHNICAL MANUAL

No. 11-6625-2851-14&P

}

HEADQUARTERS

DEPARTMENT OF THE ARMY

WASHINGTON, DC 2 September 1981

SECTION

0

OPERATOR'S, ORGANIZATIONAL, DIRECT SUPPORT AND

GENERAL SUPPORT MAINTENANCE MANUAL

INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS

FOR

IMPEDANCE METER: VECTOR ZM-74/U

(HEWLETT-PACKARD MODEL HP-4800A WITH MODEL 4801 PLUG-IN)

(NSN 6625-00-167-9861)

REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS

You can help improve this manual. If you find any mistakes or if you know of a way to improve the procedures, please let us know. Mail your letter, DA Form

2028 (Recommended Changes to Publications and Blank Forms), or DA 2028-2 located in back of this manual direct to: Commander, US Army Communications

and Electronics Materiel Readiness Command, ATTN: DRSEL- ME-MQ, Fort

Monmouth, NJ 07703.

In either case, a reply will be furnished direct to you.

Table of Contents

INTRODUCTION

Scope ..................................................................................................................

Indexes of Publications ........................................................................................

Maintenance Forms, Records, and Reports..........................................................

Reporting Equipment Improvement Recommendations (EIR)...............................

Administrative Storage .........................................................................................

Destruction of Army Electronics Materiel ..............................................................

Warranty Information ...........................................................................................

Paragraph

0-1

0-2

0-3

0-4

0-5

0-6

0-7

Page

0-1

0-1

0-1

0-1

0-1

0-1

0-1

This manual is an authentication of the manufacturer's commercial literature which, through usage, has been found to cover the data required to operate and maintain the equipment. Since the manual was not prepared In accordance with MIL-SPECS and AR 310-3, the format has not been structured to consider levels of maintenance, nor Is it structured to the normal style of military publications.

i

Section

I.

GENERAL INFORMATION

1-1

Description .................................................................................................

1-6

Accessories Furnished................................................................................

1-8

Instrument Identification..............................................................................

II.

INSTALLATION

2-1

Initial Inspection..........................................................................................

2-5

Preparation For Use....................................................................................

2-6

Power Requirements ..................................................................................

2-8

115/230 Volt Operation ...............................................................................

2-11 Power Cable ...............................................................................................

2-14 Cooling .......................................................................................................

2-16 Bench Operation.........................................................................................

2-18 Rack Mounting............................................................................................

2-20 Repackaging For Reshipment.....................................................................

III. OPERATION

3-1

Introduction.................................................................................................

3-5

Operating Controls......................................................................................

3-7

Sliderule Calculator ....................................................................................

3-9

Measurement Procedures ...........................................................................

3-10 Measuring L and C......................................................................................

3-12 Measurements Involving DC Bias ...............................................................

3-14 Transformer Measurements ........................................................................

3-16 Measurements With AC or Noise Signals Present.......................................

3-18 Analog Output Measurements.....................................................................

IV. PRINCIPLES OF OPERATION

4-1

Introduction.................................................................................................

4-4

Overall Description .....................................................................................

V. MAINTENANCE

5-1

Introduction.................................................................................................

5-3

Assembly and Component Identification .....................................................

5-6

Test Equipment Required ...........................................................................

5-8

Performance Checks ..................................................................................

5-11 Adjustment Procedures...............................................................................

5-26 Troubleshooting Procedures .......................................................................

VI. REPLACEABLE PARTS

6-1

Introduction.................................................................................................

6-4

Ordering Information...................................................................................

6-6 Manual Backdating Information...................................................................

VII. CIRCUIT DIAGRAMS

7-1

Introduction.................................................................................................

7-3

Assembly and Component Identification .....................................................

7-5

Waveforms and Voltage Measurements .....................................................

7-7

Talking Schematics ....................................................................................

VIII.

PART NUMBER-NATIONAL STOCK NUMBER CROSS REFERENCE

INDEX..................................................................................................................

APPENDIX A. REFERENCES ...................................................................................................

B. MAINTENANCE ALLOCATION

Section I.

Introduction ..........................................................................................................

II.

Maintenance Allocation Chart...............................................................................

III. Tool and Test Equipment Requirements...............................................................

TM 11-6625-2851-14&P

5-1

5-1

5-1

5-1

5-9

5-11

6-1

6-1

6-1

7-1

7-1

7-1

7-1

8-1

A-1

B-1

B-3

B-5

Page

1-1

1-1

1-1

2-1

2-1

2-1

2-1

2-1

2-1

2-1

2-1

2-2

3-1

3-1

3-1

3-1

3-1

3-4

3-4

3-4

3-4

4-1

4-1

ii

Figure

5-1

5-2

5-3

5-4

5-5

5-6

5-7

1-1

1-2

1-3

2-1

3-1

3-2

4-1

5-8

6-1

6-2

6-3

7-1

7-2

7-3

7-4

7-5

7-6

7-7

7-8

7-9

Table

1-1

3-1

5-1

5-2

5-3

5-4

5-5

6-1

6-2

6-3

7-1

LIST OF TABLES

TM 11-6625-2851-14&P

Page

Specifications.............................................................................................................

Scale Factor for Direct LC Measurements ..................................................................

Schematics and Circuit Board Illustrations..................................................................

Recommended Test Equipment and Accessories.......................................................

Performance Checks..................................................................................................

Out-of-Circuit Transistor Resistance Measurements ...................................................

Typical Ohmeter Ranges and Currents.......................................................................

Reference Designation Index .....................................................................................

Reference Designation Index 4801A Plug-in ..............................................................

Replaceable Parts Index ............................................................................................

Schematic Notes and Symbols...................................................................................

LIST OF ILLUSTRATIONS

1-0

3-4

5-1

5-2

5-3

5-12

5-13

6-2

6-14

6-16

7-0

Model 4800A Vector Impedance Meter.......................................................................

00610A Terminal Shield .............................................................................................

13525A Calibration Resistor .......................................................................................

Rack Mounting Installation Diagram ...........................................................................

4800A Front Panel Operating Controls .......................................................................

4800A Rear Panel Operating Controls........................................................................

4800A Block Diagram ................................................................................................

4800A Top View.........................................................................................................

Performance Check Test Card ...................................................................................

Power Supply Test Points ..........................................................................................

Dial Cord Replacement ..............................................................................................

Troubleshooting Tree Number 1.................................................................................




4800A Vector Impedance Meter .................................................................................

A14 Schematic and Component Locator for Serials

Prefixed 805 and Below .............................................................................................

A17 Schematic and Component Locator for Serials

Prefixed 805 and Below ............................................................................................

Functional Block Diagram ..........................................................................................

Oscillator AGC Amplifier ............................................................................................

Z Range Switching and 4801A Direct Measurement

Plug-in .......................................................................................................................

Voltage Channel Amplifiers ........................................................................................

Current Channel Amplifiers ........................................................................................

Detector and DC Amplifier .........................................................................................

Phase Measurement Circuits......................................................................................

Power Supplies ..........................................................................................................

Analog Outputs ..........................................................................................................

Page

6-22

7-3

7-5

7-7

7-9

7-11

7-13

7-15

7-17

7-19

1-1

1-2

1-2

2-2

3-2

3-3

4-0

5-0

5-7/5-8

5-9

5-14/5-15

5-16

5-18

5-20

5-22

6-19

6-21

iii

TM 11-6625-2851-14&P

0-1.

Scope

Section 0. INTRODUCTION

If your impedance Meter: Vector ZM-74t needs

This manual contains the general description, improvement, let us know. Send us an EIR. You, the installation, operation, principles of operation, and maintenance of the test instrument, which is known as the Impedance Meter: Vector ZM-74/U.

user, are the only one 'who can tell us what you don't like about your equipment. Let us know why you don't like the design. Tell us why a procedure is hard to

0-2.

Refer to the latest issue of DA PAM 3104 to determine whether there are new editions, changes, additional publications or modification work orders pertaining to the equipment.

0-3.

Indexes of Publications

Maintenance Forms, Records and

perform. Put it on an SF 368 (Quality Deficiency

Report). Mail it to Commander, US Army

Communications and Electronics Materiel Readiness

Command, ATTN: DRSEL-ME-MQ, Fort Monmouth, NJ

07703. We'll send you a reply.

0-6.

Destruction of Army Electronics

Reports

a. Reports of Maintenance and Unsatisfactory

Equipment. Department of the Army forms and

Materiel

Destruction of Army electronics materiel to prevent enemy use shall be in accordance with TM 750-244-2.

0-5.

Administrative Storage

procedures used for equipment maintenance will be those prescribed by TM 38-750, The Army Maintenance

Management System.

For administrative storage of your Impedance Meter:

Vector ZM-74/U Wrap set in heavy kraft paper and tape securely with packaging tape.

b. Report of Item and Packaging Discrepancies.

Fill out and forward SF 364 (Report of Discrepancy

(ROD) as prescribed in AR 735-11-2/DLAR

0-7.

Warranty Information

The Impedance Meter: Vector ZM-74/U (HEWLETT-

4140.55/NAV-MATINST 4355.73/AFR 400.54/MC0

4430.E.

c. Discrepancy in Shipment Report (DISREP) (SF

PACKARD MODEL, 4800A) by HEWLETT-PACKARD for one year from the date of shipment. Warranty period starts on the date found in block 23 of DA Form 2408-9

361). Fill out and forward Discrepancy in Shipment

Report (DISREP) (SF 361) as prescribed in AR 55-

38/NAVSUPINST 4610.33B/AFR 75-18/MCO

P4610.19C and DLAR 4500.15.

in the logbook. Report all defects in material or workmanship to your supervisor, who will take appropriate action through your organizational maintenance shop.

0-4.

Reporting Equipment Improvement

Recommendations (EIR)

0-1

TABLE 1-1. SPECIFICATIONS

TM 11-6625-2851-14&P

1-0

1-1.

DESCRIPTION

TM 11-6625-2851-14&P

SECTION I

GENERAL INFORMATION

detector measures the phase difference between the current and voltage.

1-2.

The Model 4800A Vector Impedance Meter

(Figure 1-1) is a self-contained instrument designed to measure complex impedances for a wide variety of applications. Impedance magnitude is measured from 1 ohm to 10 megohms in seven ranges and phase angle from -90 degrees to +90 degrees. The measurement frequency is adjustable from 5 Hz to 500 kHz in five

ranges. Complete specifications are given in Table 1-1.

1-5.

The 4800A is equipped with analog outputs for the impedance magnitude, phase angle, and frequency parameters. These outputs may be used to obtain permanent traces on a two-pen X-Y recorder. The analog outputs can also be connected to a digital voltmeter for a high resolution digital readout with excellent repeatability.

1-6.

ACCESSORIES FURNISHED

1-3.

Impedance of components, complex networks, and other two-terminal devices is measured by connecting the "unknown" to the terminals of the 4801A

Direct Measurement Plug-in furnished with the Vector

Impedance Meter. After selecting the desired test frequency and adjusting the impedance range switch, both the impedance magnitude in ohms and phase angle in degrees are read directly on front panel meters.

1-4.

The 4800A injects a signal from an internal oscillator into the "unknown" and monitors the voltage and current. In the first three impedance ranges the current is maintained at a constant level and the voltage is measured, providing a signal proportional to the impedance magnitude. In the upper four impedance ranges the voltage is maintained at a constant level and the current is measured, providing a signal inversely proportional to the impedance magnitude. A phase

1-7.

An -hp- 00610A Terminal Shield (Figure 1-2) is supplied with the 4800A to reduce terminal capacitance by a factor of one hundred below unshielded terminal capacitance. An -hp- 13525A Calibration Resistor

(Figure 1-3) is supplied to provide a convenient check of impedance measurement accuracy. In addition, an -hp-

5060-0775 Rack Mounting Kit and -hp- 5060-2693I

Circuit Board Extender are also supplied.

1-8.

1-9.

INSTRUMENT IDENTIFICATION

Each Model 4800A carries a two-section, eightdigit serial number (000-00000) which is stamped on a plate fastened to the rear panel. The five-digit number is an identification unique to each

Figure 1-1. Model 4800A Vector Impedance Meter

1-1

TM 11-6625-2851-14&P

instrument, and the three-digit number is a serial prefix used to document instrument revisions.

Figure 1-2. 00610A Terminal Shield

1-2

Figure 1-3. 13525A Calibration Resistor

TM 11-6625-3851-14&P

2-1.

INITIAL INSPECTION

2-2.

MECHANICAL CHECK. If damage to the

shipping carton is evident, ask that the carrier's agent be present when the instrument is unpacked. Inspect the instrument for scratches, -dents, broken knobs and switches, and any other mechanical damage. Also check the cushioning material for signs of severe stress as an indication of rough handling in transit.

2-3.

PERFORMANCE CHECK. The electrical

performance of the 4800A should be verified as soon as possible after receipt. A performance check that is suitable for initial inspection is contained in Section V.

SECTION II.

INSTALLATION

2-11. POWER CABLE

2-12. To protect operating personnel, the National

Electrical Manufacturers' Association (NEMA) recommends that instrument panels and cabinets be grounded. The 4800A is equipped with a detachable, three-conductor power cable which, when plugged into an appropriate receptacle, grounds the panel and cabinet of the instrument. The offset pin on the power cable three-prong connector is the ground pin.

2-13. To preserve the protective feature when operating the instrument from a two-contact outlet, use a threeprong adapter (-hp- Stock No. 1251-0048) and connect the green pigtail on the adapter to ground.

2-14. COOLING

2-4.

CLAIM FOR DAMAGE. If, upon receipt, the

4800A is damaged or fails to meet performance

specifications, refer to paragraph 0-3 in Section 0 of this

manual.

Retain the shipping carton and padding material for the carrier's inspection.

2-5.

PREPARATION FOR USE

2-15. During operation of the 4800A, the temperature of the surrounding air should not exceed 550C (1310F).

Clearance at the rear and sides of the cabinet should be provided to maintain adequate cooling. The clearances provided by the plastic feet in bench stacking and the filler strips used in rack mounting are adequate for the top and bottom cabinet surfaces.

2-16. BENCH OPERATION

2-6.

POWER REQUIREMENTS

2-7.

The 4800A requires a power source of 105 to 125

V or 210 to 250 V, 50 to 400 Hz, which can supply approximately 27 watts.

2-8.

115/230 VOLT OPERATION

2-9.

A two-position slide switch, located on the rear panel, permits operation from either a 115 or 230 volt power source. Before connecting the 4800A to the power source, check that the number visible on the slide switch matches the nominal line voltage of the source.

If required, slide the switch to the other position using a thin-bladed screwdriver.

2-17. The 4800A has plastic feet which provide clearance for air circulation beneath the instrument during bench operation. The feet are also designed to make all full width -hp- modular cabinet instruments, such as the 4800A, self-aligning when stacked. In addition, a fold-away tilt stand is provided which permits inclining the instrument for ease in adjusting controls.

2-18. RACK MOUNTING

2-10. When the instrument leaves the factory, the proper fuse is installed for 115-volt operation. An envelope containing a fuse for 230-volt operation is attached to the front handle. Markings on the rear panel adjacent to the fuse holder indicate the correct fuse rating for operation from either power source. Make sure that the correct fuse is installed if the position of the slide switch is changed.

2-19. The 4800A can be modified for rack mounting by removing the plastic feet and tilt stand from the bottom, and by adding a filler strip and two rack mounting flanges to the front panel. These parts and the attaching hardware are contained in the rack mounting kit (-hp- Stock No. 5060-0775) which is furnished with the instrument. The kit and installation instruments are shown in Figure 2-1.

2-1

2-20. REPACKAGING FOR RESHIPMENT

2-21. The original shipping carton and packing material should be used for repackaging.

The packaging materials should include the following:

- a double-walled carton

TM 11-6625-2851-14&P

- heavy paper or cardboard to protect all instrument surfaces

- extra material around projecting parts of instrument

- at least four inches of tightly-packed shock-

, absorbing material surrounding the instrument.

- durable shipping tape to securely seal the carton

Figure 2-1. Rack Mounting Installation Diagram

2-2

TM 6625-2851-14&P

3-1.

INTRODUCTION

3-2.

The4800A Vector Impedance Meter measures impedance directly by injecting a signal into the

"unknown" and comparing the ratio of voltage to current.

Depending on the impedance range, either the voltage or current is held constant by an automatic leveling control circuit (ALC). Impedance is directly proportional to voltage with the current held constant, and inversely proportional to current with the voltage held constant.

Phase angle is measured by comparing the phase relationship between the voltage and current waveforms. Impedance magnitude is measured from 1 ohm to 10 megohms in seven decade ranges; phase angle is indicated from -90 degrees to i90 degrees.

3-3.

The Z MAGNITUDE meter has two scales: a direct-reading black scale used with the black engraved

Z RANGE positions X1, X10, and X100, and an inversereading red scale used with the red engraved Z RANGE positions X1K, X10K, X100K, and X1M. An off-scale reading to the right, with the Z RANGE switch at a black engraved position, indicates the range is too low and the switch should be advanced clockwise. An off-scale reading to the right, with the Z RANGE switch at a red engraved position, indicates the range is too high and the switch should be turned counterclockwise.

range.

NOTE

After changing ranges, allow a few seconds for circuits to return from an overload condition; if pointer does not indicate on scale, change to the next

3-4.

The analog outputs on the rear panel provide dc voltages proportional to Z MAGNITUDE meter deflection, PHASE ANGLE meter deflection, and

FREQUENCY dial rotation.

SECTION III.

OPERATION

3-8.

A slide rule calculator ( 5952-251 b)has been shipped with the equipment to simplify the more common conversions and calculations that arise with impedance measurements. One side of the slide rule is a Vector Impedance Calculator that resolves the impedance vector Z into its resistive and reactive components. The other side of the slide rule is a

Capacitance-Inductance Reactance Calculator that is especially useful for solving resonant frequency problems. The calculator may also be used as a scale factor "nomograph" when direct-reading component measurements are being made with the 4800A (see

Paragraph 3-10). The simple instructions necessary to

use the calculators are printed on the slide rule

(P/N5952-2516),

3-9.

MEASUREMENT PROCEDURES

3-10. MEASURING L AND C

3-11. The 4800A provides readings in capacitance and inductance when the FREQUENCY dial is set to the

"LC" mark (15.92). Thus, at the frequencies 15.92 Hz,

159.2 Hz, 1.592 kHz, and 159.2 kHz, readings on the Z

MAGNITUDE meter scales can be converted to microfarads or microhenries using the "LC" formulas engraved on the front panel, and components may be

measured directly. Table 3-1 gives the scale factors

that apply when the 4800A is operated in this mode.

Example 1: A coil indicating 800 ohms on the Z

MAGNITUDE meter with the FRE-

QUENCY RANGE switch set to X10

(n = 3), has a value of:

LpH = Z x

10n

L/H =

800 x 103

L = 0.8 H

3-5.

3-6.

OPERATING CONTROLS

Figures 3-1 and 3-2 identify and briefly describes the purpose of each panel control, switch, and connector.

Example 2: A capacitor indicating 30 K ohms on the

AGNITUDE meter with the FRE-

NCY RANGE switch set to X1K

= 1), has a value of:

CUF=1/Z x 10 n

CUF = 1/30K 10 1

C = 333 pF

3-7.

SLIDERULE CALCULATOR

3-1

Figure 3-1. 4800A Front Panel Operating Controls

3-2

TM 11-6625-2851-14&P

Figure 3-2. 3800A Rear Panel Controls

3-3

TM 11-6625-2851-14&P

Table 3-1. Scale Factors for Direct L1C Measurements

(Frequency Direct Reading

Range) C Range

(n=O) (n=4)

Direct Reading

L Range

(n=O) (n=4)

Z Range

X1

X10

X100

X1K

X10K

X100K

X1M

0.1AF to 10000pF

0.01IF to 1000pF

0.001.F to 100pF

100pF to 10pF

10pF to 1pF

1pF to 0.1pF

0.1pF to 0.01pF

1pH to 100mH

10H to 1H

100lpH to 10H

1mH to 100H

10mH to 1000H

100mH to 10000H

1H to 100000H

3-12. Measurements Involving DC Bias

3-13. If it is necessary to make impedance measurements in the presence of dc bias, a blocking capacitor must be used to isolate the de from the

4800A. The impedance of the capacitor must be small compared to that of the device under test. This can be verified with the 4800A. Since the de bias supply appears in parallel , with the unknown, the impedance of this portion of the circuit must be high with relation to the unknown. If this condition cannot be achieved, the bias supply impedance will reduce the impedance of the unknown. This reading can be corrected, however, by making a separate measurement of the bias supply impedance and then correcting the data. The bias supply must be ungrounded unless the regulating resistor is very large. A large resistor with a grounded supply will isolate the 4W00A test signal from ground.

3-14. Transformer Measurements

3-15. The 4800A has the capability to quickly

characterize transformers by providing a plot of vector impedance as a function of frequency. Measurements that can be made include the primary inductance, primary resistance, secondary inductance, secondary resistance, and turns ratio.

3-16. Measurements with AC or noise signals present

3-17. Measurements with external ac or noise signals present require the use of careful techniques. The cording. The analog outputs may also be connected to an -hp- Model 3440A Digital Voltmeter, providing a digital readout for greater resolution. In addition, an ideal go-no-go impedance checkout system can be obtained by combining the 4800A with the -hp- Model

3434A Comparator.

3-20. Frequency Analog Output.

To calibrate the X-axis of an X-Y recorder to a given dial frequency, proceed as follows:

NOTE

The FREQ ANALOG OUTPUT has no

3-4

TM 11-66252851-14&P

exact mathematical relationship to the frequency dial but it is approximately logarithmic.

impedance measuring circuits of the 4800A may amplify an unwanted signal to the same order of magnitude as the internal test signal. This situation will result in a completely spurious impedance reading. The condition is generally easy to recognize, however, since it will become difficult to obtain a stable on-scale reading of either impedance or phase, or both. To help eliminate interference from unwanted signals, bandpass filtering is used for each frequency range. Interference can sometimes be effectively filtered by choosing a frequency two decades away from the unwanted signal.

In measurements where interfering noise is likely, such as with antennas, electrical isolation is often necessary.

In addition, devices which have the property of converting some other parameter to electrical energy must be isolated from excitation. For instance, a piezoelectric transducer will have to be isolated from mechanical vibration to prevent the generation of unwanted signals. In addition to the precautions mentioned, care should be taken not to apply more than

1 volt rms of external ac to the 4801A measurement terminals; otherwise damage may result to protective diodes CR1-4 in the 4801A.

3-18. Analog Output Measurements

3-19. The 4800A analog outputs may be used to drive the -hp- Model 136A Two-Pen X-Y Recorder. This will provide a continuous record of impedance and phase as a function of various parameters, such as frequency or

bias current. Paragraphs 3-20 through 3-22 describe the

analog output adjustment procedures for X-Y rea. Connect FREQ output to the recorder X-axis input.

b. With recorder pens raised, rotate 4800A

FREQUENCY dial from "5" to "50" and mark desired frequency points on the recorder paper.

NOTE

Once this frequency calibration has been accomplished, it need not be repeated for subsequent plots. The original calibration may be transferred from one plot to the next.

3-21. Magnitude Analog Output. This procedure

adjusts the MAGNITUDE ZERO ADJ and LEVEL ADJ for proper X-Y recorder operation. Proceed as follows: a. Set 4800A controls as follows:

Z RANGE X10

FREQUENCY RANGE X1K

FREQUENCY dial "LC" (15.92) b. Connect dc voltmeter to MAGNITUDE output and a 0.1 uF capacitor to measurement terminals.

c. Adjust FREQUENCY dial for a reading of 10.0

on the Z MAGNITUDE meter black scale.

d. Adjust MAGNITUDE LEVEL ADJ for 1.0 V on voltmeter.

e. Change Z RANGE to X100.

f. Adjust FREQUENCY dial for a reading of 1.0

on the Z MAGNITUDE meter black scale.

g. Adjust MAGNITUDE ZERO ADJ for 0.1 V on voltmeter; due to interaction between controls, this procedure must be repeated until desired accuracy is achieved.

NOTE

The MAGNITUDE output voltage is directly proportional to readings on the black meter scale ranges and inversely proportional to readings on the red meter scale ranges.

3-5

TM 11-6625-2851-14&P

3-22. PHASE ANALOG OUTPUT. This procedure

adjusts the PHASE LEVEL ADJ and ZERO ADJ for proper X-Y recorder operation. Proceed as follows: a. Set 4800A controls as follows:

Z RANGE X1K

FREQUENCY RANGE X100

FREQUENCY dial "LC" (15.92) b. Connect dc voltmeter to PHASE output and 1

KQ Calibration resistor to measurement terminals.

c. Adjust PHASE ZERO ADJ for O V on voltmeter.

d. Connect a 0.1 lF capacitor to measurement terminals.

e. Adjust PHASE LEVEL ADJ for -0.9 V on voltmeter; due to interaction between controls, this procedure must be repeated until desired accuracy is achieved.

Figure 4-1. 4800A Block Diagram

4-0

TM 11-6625-2851-14&P

4-1.

INTRODUCTION

4-2.

The 4800A Vector Impedance Meter measures impedance magnitude and phase angle of passive components and networks over an adjustable frequency range of 5 Hz to 500 kHz. Impedances up to 1 K ohms are measured by passing a predetermined constant current through the "unknown" and measuring the voltage across it; this voltage is proportional to impedance magnitude. Impedances between I K ohms and 10 megohms are measured by applying a predetermined constant voltage across the "unknown" and measuring the current through it; this current is inversely proportional to impedance magnitude. Phase angle measurements are obtained by comparing the relative phase between the voltage and current by means of a phase detector.

4-3.

The following paragraphs describe, at a block diagram level, the overall relationship between the major functional groups of the 4800A. Detailed descriptions of the individual circuits are provided in

Section VII by means of text overlays adjacent to corresponding schematics.

4-4.

OVERALL DESCRIPTION

4-5.

A simplified block diagram (Figure 4-1) illustrates

4800A operation in the first three decade ranges of the

Z RANGE switch. In these ranges a constant current is applied to the "unknown" at the measurement terminals, and the voltage across the "unknown" is measured.

4-6.

An oscillator provides a test signal within the frequency range of 5 Hz to 500 kHz, as determined by the FREQUENCY RANGE switch and FREQUENCY dial, to an AGC amplifier. The AGC amplifier holds the signal current through the Z RANGE switch and the

"unknown" at a constant level by means of an ALC feedback loop. This current is applied to a transresistance amplifier which provides an output voltage proportional to the current flowing in the

"unknown". The voltage is amplified, filtered, and

4-1

TM 11-6625-2851-14&P

forwarded through relay contacts to an ALC amplifier/detector. A detected leveling signals then fed back to the AGC amplifier.

4-7.

In the first three impedance ranges the voltage across the "unknown" is applied to a differential amplifier through two sets of relay contacts. The output of the differential amplifier is amplified, filtered, and forwarded through relay contacts to a Z magnitude detector. Output from the detector is proportional to the impedance of the "unknown" which is indicated on the Z

MAGNITUDE meter.

4-8.

When the 4800A is operated in the upper four ranges of the Z RANGE switch, the relay contacts switch to their alternate positions, and the voltage is held constant while the current through the "unknown" is measured. This current is applied to the Z magnitude detector through relay contacts. Output from the detector is inversely proportional to the impedance of the "unknown" which is indicated on the Z MAGNITUDE meter.

4-9.

The voltage is maintained at a constant level during 4800A operation in the higher impedance ranges by a sample voltage that is applied to the differential amplifier. The output of the amplifier is forwarded through relay contacts to the ALC detector/amplifier. A detected leveling signal is then fed back to the AGC amplifier.

4-10. Phase angle is measured the same way in both the constant current and constant voltage modes of operation. Signals from the current and voltage channels are filtered to improve signal-tonoise ratio and then converted to pulses in Schmitt trigger circuits (zerocrossing detectors). The output pulses from the Schmitt triggers drive a binary phase detector, which provides an output voltage proportional to the phase difference between the two channels. A zero-center PHASE

ANGLE meter reads this voltage as phase angle in degrees.

Figure 5-1. 4800A Top View

5-0

TM 11-6625-2851-14&P

TM 11-6625-2851-14&P

SECTION V

5-1.

INTRODUCTION

MAINTENANCE

5-9.

The performance checks provided in Table 5-3

5-2.

This section contains information required to verify the 4800A operation to be within specifications maintain the 4800A Vector Impedance Meter. The

(refer to Section I, Table 1-1). The performance checks

may be used: information covered is summarized below.

a. Assembly and Component Identification -

Identifies and physically locates the 4800A assemblies, a. As part of incoming inspection b. For monthly routine reliability checks components and calibration adjustments.

b. Test Equipment Required - Lists and describes test equipment necessary to perform the operations in this section.

c. Before returning to regular service after completed repairs.

d. As part of troubleshooting to locate malfunctioning circuits.

c. Performance Checks - Verify proper operation of the 4800A.

d. Adjustment Procedures - Used for adjustment of 4800A when repaired.

e. Troubleshooting Procedures - Used as an aid to locating 4800A malfunctions.

5-10. A sample Performance Check Test Card is included in this section. The card may be duplicated and completed during 4800A Performance Checks to provide a permanent record.

5-3.

ASSEMBLY AND COMPONENT

IDENTIFICATION

Table 5-1. Schematics and Circuit Board Illustrations

Schematic

Diagram and

Assy No Designation Circuit Board

Parts Location

Figure No.

5-4.

Figure 5-1 identifies 4800A circuit board

assemblies and calibration adjustments. Table 5-1 lists

the assemblies numerically by reference designation and indexes each to its schematic diagram.

5-5.

Each circuit-board mounted component is identified on an illustration of the circuit board which also shows the etched wiring. These illustrations appear in Section VII with their schematics. The reference designation of each component mounted on a circuit board should be prefixed by the assembly number to form a complete designation; for example, A3R11.

5-6.

TEST EQUIPMENT REQUIRED

5-7.

Instruments required to perform the operations in

this section are listed in Table 5-2. This table lists the

type of equipment required, critical specifications, use, and recommended model or type. For operating instructions refer to the manual supplied with the equipment. If the equipment listed i6 not available, equipment which meets or exceeds the critical specifications may be used.

A1 Utility Amplifier 7-5


A3 Bandpass Filter 7-5


A5 Detector (meter) 7-6

A6 Filter Amplhfier 7-7

A7 Schmitt Trigger 7-7

A8 Phase Detector 7-7


A10 Bandpass Filter 7-4

A11 Utility Ampblier 7-4

A12 Detector (ALC) 7-6

A13 Filter Amplifier 7-7

A14 DC Amplifier 7-6

A15 Analog Outputs 7-9

A16 Oscillator Amp 7-2

A17 AGC and Monitor Amplifier 7-2

A18 20 Volt Regulator 7-8

A19 Rectifier and 14 Volt Regulators 7-8

A20 Magritude Range Switch Assembly 7-3

A21 Oscillator Switch Assembly 7-2

A22 Variable Capacitor Assembly) 7-2

A23 Direct Measurement Plug-in 7-3

(Model 4801A)

5-8.

PERFORMANCE CHECKS

5-1

Instrument or Accessory

Type

DC Voltmeter

Oscilloscope

Electronic Counter

AC Voltmeter

Ohmmeter

Variable Transformer

Inductor

Resistor

Calibration Resistor

Resistor

Decade Resistor

Decade Resistor

Capacitor

Capacitor

Capacitor

Circuit Board Extender

TM 11-6625-2851-14&P

Table 5-2. Recommended Test Equipment and Accessories

Critical Specifications Use

Voltage range: 1 mV to100

V full scale

Frequency range: to 20

MHz Sensitivity: to 10 pV/cm Sweep speeds to 50 ns/cm

Frequency range: S HZ to500 kHz

Range: 1.0 mV to 300 volts full scale, Accuracy: * 1% of full scale

Resistance Range: 0.1 ohm to 1000 megohms

Output 115V *20% or 230

V

±

20% Current: 2 amperes

10 millenaries with a Q greater than 100

100 ohms 0.1%

1 K ohms *0.25%

Performance Checks

Adjustments

Troubleshooting

Troubleshooting

Performance Checks

Adjustments

Adjustments

Troubleshooting

Troubleshooting

Adjustments

Troubleshooting

Performance Checks

Adjustments

Performance Checks

Adjustments

Troubleshooting

Adjustments

Performance Checks

Recommended Instrument or Accessory

-hp Model 412A DC

Voltmeter, ohmmeter, ammeter

-hp- Model 140A

Oscilloscope W/1420A

Time Base and 1402A Dual

Trace Amplifier

-hp- Model 5245L Electronic

Counter

-hp- Model 400E AC

Voltmeter

-hp Model 412A DC

Voltmeter, Ohmmeter,

Ammeter

General Radio Type

W10M3TA

-hp- Stock No. 103A41

-hp Stock No. 0698-4343

-hp- Stock No.

13525A(Supplied

Accessory)

-hp- Stock No. 0698-4157

General Radio Type 510D

10 K ohms *0.1%

0 - 1 K ohms

±

0.1% in100 ohm steps

0 - 10 K ohms +0.1%in1000 ohm steps

0.1 , pF *0.1%

0.01 pF *0.1%

0.001 pF * 0.1%

15 pin fitted with connector to extend circuit board assemblies

Performance Checks

Performance Checks

Adjustments

Performance Checks

Adjustments

Troubleshooting

General Radio Type 510E

General Radio Type 1409-T

General Radio Type 1409-L

General Radio Type 1409-F

-hp- Stock No. 5060-

0049(Supplied Accessory)

5-2

Table 5-3. Performance Checks

TM 11-6625-2851-14&P

5-3

Table 5-3. Performance Checks (Cont)

TM 11-6625-2851-14&P

5-4

TM 11-6625-2851-14&P


h.

Z MAGNITUDE TRACKING CHECK

1.

Set Z RANGE to X100, FREQUENCY RANGE to X100, and FREQUENCY dial to 10.

2.

Connect decade resistor to measurement terminals and set to 1 K ohm.

3.

Decrease decade resistor in 100 ohm steps while noting Z meter readings.

4.

Set decade resistor to 1 K ohm and Z RANGE to X1K.

5.

Increase decade resistor in 1 K ohm steps while noting Z meter readings.

6.

The error at any setting should not exceed ± 5% of reading.

3.

PHASE ANGLE MEASUREMENT ACCURACY

SPECIFICATIONS: + 60

This procedure verifies 4800A phase angle measurement accuracy. Proceed as follows:

NOTE

At very low frequencies such as 5 Hz, it is normal for the phase

meter to oscillate around the proper reading.

a.

Connect 1 K ohm Calibration resistor to measurement terminals. b.

Set 4800A controls as follows:

Z RANGE X100

FREQUENCY RANGE

FREQUENCY dial

X1

5 c.

PHASE ANGLE meter should indicate 0° +60. Change FREQUENCY RANGE from X1 to X10K; meter should remain within + 60 d.

Connect 0.01 pF capacitor to measurement terminals.

e.

Set 4800A controls as follows:

Z RANGE

FREQUENCY RANGE

X100

X1K f.

FREQUENCY dial '"LC" (15.92)

PHASE ANGLE meter should indicate -900 ±60.

5-5

TM 11-6625-2851-14&P


g.

Replace 0.01 MF capacitor with a 10 mH inductor; PHASE ANGLE meter should indicate +900 ±6°.

NOTE

For low Q inductors, the PHASE

ANGLE meter will read slightly low (9 = arctan Q).

4.

a.

FREQ OUTPUT

1. Connect DC voltmeter, set to 1 V range, to FREQ connector.

2. DC output should be approximately 1 V at 50 on dial, decreasing with dial rotation.

b.

MAGNITUDE OUTPUT

1. Connect DC voltmeter, set to 1 V range, to MAGNITUDE output connector.

2. Set 4800A controls as follows:

Z RANGE 10K

FREQUENCY RANGE

FREQUENCY dial

X100

10

3. Connect 10 K ohm resistor to measurement terminals.

4. DC output should be adjustable to 1.0 V with MAGNITUDE LEVEL ADJ.

c.

PHASE OUTPUT

1. Connect DC voltmeter, set to 1 V range, to PHASE output connector.

2. Set 4800A controls as in b-2 above.

3. Connect 0.01 /F capacitor to measurement terminals.

4. DC output should be adjustable to -0.9 V with PHASE LEVEL ADJ.

5-6

Performance Check Test Card

TM 11-6625-2851-14&P

Figure 5-2. Performance Check Test Card

5-7

5-11. ADJUSTMENT PROCEDURES

5-12. The following adjustment procedures should be performed only if it has been determined by the

Performance Checks given in Table 5-3 that the 4800A

is not within specifications. Tolerances associated with adjustments are given as aids to making the adjustments. These tolerances do not constitute a basis for qualification or acceptance of an instrument since no allowance has been made for temperature or aging effects. Qualification and overall performance should

be based on the specification listed in Table 1-1.

NOTE

Except where indicated, adjustments and tests are made at nominal line voltage. Access to adjustments may require use of the supplied plug-in extender.

CAUTION

Remove all power to the 4800A before removing or replacing plug-in assemblies.

5-13. COVER REMOVAL. To remove top or cover,

remove four phillips-head screws. Slide cover approximately 1/2 inch towards rear of chassis and lift free. To replace cover, reverse removal procedure.

5-14. METER MECHANICAL ADJUSTMENT. This

procedure sets the zero of the Phase Angle meter.

NOTE

The Z MAGNITUDE meter is factory adjusted and does not require any mechanical adjustment.

a. Remove power from 4800A.

b. Rotate meter zero adjustment screw clockwise until the meter pointer is to the left of zero and moving towards zero.

c. Continue to rotate adjustment screw clockwise until the meter pointer is exactly on zero. If pointer moves past zero, repeat steps b and c.

5-15. POWER SUPPLIES. This procedure adjusts the

±20 V supply to the proper level. There are no adjustments for the other power supplies. Proceed as follows: a. Adjust +20 V Adjust A18R16 for +20, 0.1 Vat

A9 (10). Tap A18 assembly with a pencil. If voltage changes, readjust A18R16 as required. Continue

5-9

TM 11-6625-2851-14&P

tapping and readjusting until voltage becomes stable within :0.1 V.

b. Check other power supply voltages listed below (see Figure 5-3 for test points).

-20 -0.1 V

-14 +1 V (A)

-14 ±1 V (B)

+14+1 V

XA9(7)

XA23(9)

XA23(6)

XA23(11)

NOTE

-14 (A) and -14 (B) are two separate supplies.

c. Adjust line voltage from 102 V to 128 V. There should not be any noticeable change of the 20 V power supplies.

Figure 5-3. Power Supply Test Points

5-16. OSCILLATOR OUTPUT LEVEL. This procedure

adjusts the oscillator signal to the proper level. Proceed as follows: a. Remove jumper between INT OSC and EXT

OSC IN connectors.

b. Connect AC voltmeter to INT OSC connector.

c. AC voltmeter should read between 0.72 V and

0.88 V.

d. If reading is outside these limits, adjust

Oscillator Output Adjust A16R20 for 0.8 V reading.

e. Replace jumper.

5-17. OSCILLATOR FREQUENCY. This procedure

adjusts the oscillator frequency to correspond with the front panel dial setting.

a. Set 4800A controls as follows:


FREQUENCY dial LC (15.92) b. Set counter to read X100 Iriod and connect to

FREQ MON connector.

c. Adjust FREQUENCY dial for a reading of

628.3 /s as indicated by counter.

d. Remove FREQUENCY dial knob; loosen two screws securing dial and position "LC" mark (15.92) under fiducial hairline. Tighten screws and replace knob.

e. Change FREQUENCY RANGE to X10K and counter function to frequency.

f. Adjust HF Comp A16C1 for 159.2 kHz

(oscillator cover must be on while taking reading).

g. Check FREQUENCY dial accuracy on

X1range. Readings should be within 2 when dial is adjusted to "LC" mark and i4% at all other settings. On

X10 - X10K ranges readings should be within ±1% at

"LC" and ±2% at all other settings.

5-18. 4801A DC BIAS. This procedure adjusts the base

voltage of Q7 to zero volts with no component on the measurement terminals.

a. Set Z RANGE to X100 and remove jumper on rear panel.

b. Connect DC voltmeter to the current sensing terminal (J2).

c. Adjust DC BIAS R16 in 4801A for O V +5 mV.

d. Measure voltage on voltage sensing terminal

(J1).

e. If greater than +10 mV DC, select a value for

4801A R1 which produces a reading less than +10 mV.

5-19. ALC ADJUSTMENTS. This procedure balances

the differential amplifier Q5 and Q6 in DC Amplifier

A14.


Z RANGE X10K


FREQUENCY dial 10 b. Remove jumper on rear panel and place A14 circuit board on supplied board extender.

c. Short A14TP3 and A14TP4 together.

d. Adjust DC Balance A14R18 for 0 V +0.25 V

5-10

TM 11-6625-2851-14&P

DC between A14TP1 and A14TP2 as measured from the TP's to ground.

NOTE

Do not connect meter between A14TP1 and A14TP2 as this will cause an incorrect reading.

e. Replace jumper and A14 assembly.

5-20. CHANNEL GAIN EQUALIZATION. This

procedure adjusts the voltage channel gain to be exactly equal to the current channel gain.


Z RANGE X1OK


FREQUENCY dial 10 b. Connect 10 K ohm resistor to measurement terminals.

c. If Z MAGNITUDE meter is off scale, adjust

ALC Ref A14R25 for a reading of 9.6.

ohms.

d. Change Z RANGE to X10 and resistor to 100 e. If reading has changed, adjust Channel Gain

Equalization Adjust R2 for half of the difference.

f. Repeat steps a through e.

5-21. FULL SCALE Z. This procedure adjusts the full

scale accuracy of the Z MAGNITUDE meter.


Z RANGE X10


FREQUENCY dial 10 b. Connect 100 ohm resistor to measurement terminals.

c. Adjust ALC Ref A14R25 for a reading of 10.0

on Z MAGNITUDE meter.

5-22. 1/10 FULL SCALE Z. This procedure adjusts the

1/10 full scale accuracy of the Z MAGNITUDE meter.


Z RANGE X100


FREQUENCY dial 10

b. Select a value for A5R21 which produces a reading of 1.0 on Z MAGNITUDE meter (left end of scale).

5-23. PHASE TRIGGER LEVELS. This procedure

adjusts the voltage and current channel Schmitt Triggers to trigger at zero volts on the positive slope of the signal.


Z RANGE X100


FREQUENCY dial 10 b. Connect 1 K ohm Calibration resistor to measurement terminals.

c. Note reading on PHASE ANGLE meter.

d. Change resistor to 100 ohm.

e. Adjust Voltage Channel Trigger Level Adjust

A7R7 for the same reading noted in step c.

f. Change Z RANGE to X10K.

g. Connect 1 K ohm Calibration resistor to measurement terminals.

h. Note reading on PHASE ANGLE meter.

i. Change resistor to 10 K ohm.

j. Adjust Current Channel Trigger Level Adjust

A7R16 for the same reading noted in step h.

5-24. PHASE ZERO AND FULL SCALE. This

procedure adjusts the electrical zero and full scale accuracy of the PHASE ANGLE meter.


Z RANGE X1K

FREQUENCY RANGE X100 b. Connect 1 K ohm Calibration resistor to measurement terminals.

c. Adjust Phase Zero Adj A8R16 for 0° on

PHASE ANGLE meter.

d. Change 4800A controls as follows:

Z RANGE X100

FREQUENCY RANGE X1K

FREQUENCY dial "LC" (15.92) e. Connect 0.01 uF capacitor to measurement terminals.

f. Adjust Phase Cal A8R19 for -900 on PHASE

ANGLE meter.

5-25. PHASE SHIFT COMPENSATION. This

5-11

TM 11-6625-2851-14&P

procedure minimizes low frequency phase difference between channels and neutralizes the input capacitance of the differential amplifier Q1, Q2, Q4, and Q5 in the

4801A.


Z RANGE X1K

FREQUENCY RANGE X1

FREQUENCY dial 5 b. Connect 1 K ohm Calibration resistor to measurement terminals.

c. Adjust 5 Hz Phase Adjust R3 (on chassis between A12 and A13) for 0 on PHASE ANGLE meter.

NOTE

Meter should swing approximately 40 on both sides of 00. If R3 does not have sufficient range, interchange utility amplifiers between channels two at a time until the adjustment is within the range of R3.

d. Change 4800A controls as follows:

FREQUENCY RANGE X1OK

FREQUENCY dial 50 e. Note reading on PHASE ANGLE meter.

f. Change Z RANGE to X100.

g. Adjust HF Phase Adjust C1 in 4801A for the

same reading noted in step e.

h. If phase error is greater than +30, select a value for C2 (at XA13) that will produce an error less than +30 (usually between 33 pF and 39 pF).

5-26. TROUBLESHOOTING PROCEDURES

5-27. This section contains information and procedures to aid in isolating malfunctions. Troubleshooting should be undertaken only after it has been determined that the malfunction cannot be corrected by performing the

Adjustment Procedures.

5-28. SYSTEM TROUBLESHOOTING. The

troubleshooting trees shown in Figures 5-5 through 5-8

are a logical diagnosis of symptoms, and several specific front-panel symptoms. It must be emphasized that the trees are not a strict elimination procedure, and that other circuits than those listed can be at fault. The trees are based on the assumption that only one particular circuit is at fault.

NOTE

When observing front panel indications, if there is a large Z MAGNI-

TUDE error, there may also be a

PHASE ANGLE error. This should be considered only a Z MAGNITUDE malfunction for troubleshooting purposes.

5-29. To use the troubleshooting trees, first determine the symptoms of the malfunction by using the

Performance Checks in Table 5-3. Then select the

appropriate trees according to the symptoms observed.

At each point where a decision has been made there is a number. This number corresponds to a similarly numbered comment which aids in understanding the logic of the troubleshooting tree.

5-30. SECTIONAL TROUBLESHOOTING. Sectional

troubleshooting is performed after the malfunction has been isolated to a particular 4800A assembly. Refer to the applicable schematic diagram (Figures 7-2 through

7-9) and compare assembly waveforms and voltages to those shown on the schematic. The schematic measurements should not be considered performance specifications since they may vary with component tolerances, aging, and temperature. They are provided only to assist troubleshooting.

5-31. When in-circuit testing a transistor stage, first determine if the emitter-base junction is properly biased.

Do not place an electronic voltmeter directly across the junction to measure the voltage difference; there could be sufficient loop current between the voltmeter leads to damage the transistor. Instead, measure each voltage separately with respect to a common point (e.g., chassis). If junction is not properly biased and power supply voltages are known to be correct, the baseemitter junction may be open.

5-32. If the emitter-base junction is forward-biased, check for amplifier action by short-circuiting base to emitter while observing collector voltage. The short eliminates base-emitter bias and should cause the transistor to stop conduction. Collector voltage will then change to near the supply in most circuits. Any difference is due to leakage current through the transistor, and in general, the smaller this current, the better the transistor. If the collector voltage does not change, the transistor either has an emitter-collector short or emitterbase open circuit.

5-33. If a short or open is suspected, remove the transistor from the circuit and use an ohmmeter to

measure internal resistance. See Table 5-4 for

5-12

TM 11-6625-2851-14&P

CAUTION

Most ohmmeters can supply enough current or voltage to damage a transistor. Before using the ohmmeter, check ohmmeter open-circuit voltage and short-circuit current output ON

THE RANGE TO BE USED. Open-circuit voltage must not exceed 1.5 volts and short-circuit current must be

less than 3 mA. See Table 5-5 for

safe resistance ranges for some common ohmmeters.

Table 5-4. Out-of-circuit Transistor Resistance,

Measurements.

TRANSISTOR TYPE CONNECT OHMMETER MEASURE

POS LEAD TO NES LEAD TO RESISTANCE

(OHMS)

Ge

PNP

SMALL

SIGNAL

POWER

EMITTER

EMITTER

EMITTER

EMITTER

BASE* 200-500

COLLECTOR 10K-0100K

BASE* 200-500

COLLECTOR SEVERAL

HUNDRED

Si SMALL

NPN SIGNAL

BASE

COLLECTO

R

EMITTER

EMITTER

1K-3K

VERY

HIGH-MAY

READ

OPEN

POWER BASE

COLLECTO

R

EMITTER

EMITTER

200-1000

HIGH,

OFTEN

GREATER

THAN IM

10K-100K Si

PNP

SMALL

SIGNAL

EMITTER

EMITTER

BASE*

COLLECTOR VERY

HIGH- MAY

READ

OPEN

*TO TEST FOR TRANSISTOR ACTION, ADD COLLECTOR - BASE

SHORT. MEASURED RESISTANCE SHOULD DEGREASE.

5-34. The Model 4800A uses plated through double sided etched circuit boards. To prevent damage to the circuit board and components, observe the following rules when soldering: a. Use a low heat (25 to 50 watts) soldering iron with a small tip (1/16" to 3/32" dia. ).

b. To remove a component, clip a heat sink (long nose pliers, commercial heat sink tweezers etc. ) on the component lead as close to the component as possible.

Place the soldering iron directly on the component lead and pull up on the lead. If a component is obviously damaged or faulty, clip the leads close to the component and then remove the leads from the board.

Table 5-5. Typical Ohmmeter Ranges and Currents

OHMME

TER

SAFE

RANG

E(S)

OPEN CKT

VOLTAGE

SHORT

CKT

CURRENT

LEAD

COLOR POLA

RITY hp 412A hp 427A hp410C hp410B

SIMPSO

N 260

R x 1K 1.0V

R x10K 1.0V

R x

100K

1.0V

R x 1M 1.0V

R x 1.0V

10M

R x 1K 1.3V

R x 1.3V

10K

R x 1.3V

100K

R x 1M 1.3V

R X

10M

1.3V

R x 1.1V

100

R x 1K 1.1V

R x

10K

1.1V

R x

100K

1.1V

R x 1M 1.1V

R x

100

1.5V

1 mA

100 pA

10 pU

1pU

0.1pU

0.57 mA

57pA

5.7 pA

0.5 pA

0.05 pA

1.1Ma

110 pA

11 pA

1.1 pA

0.11 pA

1 MA

RED

BLACK

RED

BLACK

RED

BLACK

RED

+

-

+

-

+

-

+

SMPSON

269

R x 1K 1.5V

3.25 Ma

BLACK

RED

-

+

TRIPLET

T 630

TRIPLET

310

R x

100

1.5V

R x 1K 1.5V

R x 10 1.5V

3.25 mA

3.25pA

750Pa

BLACK -

VARIES WITH

SERIAL

NUMBER

R x

100

1.5V

75pA

CAUTION

EXCESSIVE OR PROLONGED HEAT

5-13

c. Clean the component lead holes by heating the solder in the hole, quickly removing the soldering iron, and inserting a pointed non-metallic object such as a toothpick.

TM 11-6625-2851-14&P

CAN LIFT THE CIRCUIT FOIL OR

CAUSE DAMAGE TO COMPONENTS.

d. To mount a new component, shape the leads and insert them in the holes. Clip a heat sink on the component, heat with the soldering iron, and add solder as necessary to obtain a good electrical connection. e. Clip excess leads off after soldering and clean excess flux from the connections and adjoining area.

5-35. REMOVAL OF ANALOG ASSEMBLY. To

remove the analog output assembly use the following procedure:

a. Remove four screws from rear panel.

b. Slide released BNC connector portion of analog circuit board through hole in rear panel and hold in position just above analog board card assembly.

c. Remove circuit board by pulling straight up on board assembly until it is released from connector slot and then sliding board straight up until it is free of guide tracks. Remove analog circuit board from impedance meter.

d. To install analog assembly, reverse removal procedure.

5-36. FREQUENCY DIAL CORD REPLACEMENT.

To replace the frequency dial cord, use the following procedure in conjunction with Figure 5-4.

NOTE

After the dial cord is replaced, it will be necessary to reclibrate the FRE-

QUE NCY dial (refer to paragraph 5-17).

e. Connect one end of spring to dial cord and the other end of the spring to the rear pin of the analog pulley.

f. Place cord through rear slot and make one turn around analog pulley in a counterclockwise direction.

g. Pull cord downtoward small pulley and make 1-

1/2 turns around small pulley in a counter clockwise direction.

h. Pull cord up towards analog pulley and place cord through front slot of analog pulley.

i. Secure dial cord to front pin of analog pulley.

j. Rotate FREQUENCY dial fully clockwise and connect DC voltmeter to FREQ connector on rear panel.

k. Loosen set screw on analog pulley and rotate

R11 fully clockwise (looking from front panel).

l. Rotate R11 slightly counterclockwise and tighten set screws.

m. Rotate FREQUENCY dial to "5". The DC

TM 11-6625-2851-14&P

voltmeter should read 0.1 V or less.

5-38. CLEANING - Should it become necessary to wash

the 4800A the following procedure should be used.

a. Remove A22Q1 b. Remove meters from 4800A c. Wash 4800A with warm water and mild detergent.

d. Remove excess water with dry nitrogen or air from a filtered high pressure line.

e. Bake in an oven at 650C for 24 hours.

f. A22Q1 should be washed in the same manner.

CAUTION

Use warm water and mild detergent only. The use of cleaning solvents may damage parts of the 4800A.

Figure 5-4. Dial Cord Replacement

5-14/5-15

Figure 5-5. Troubleshooting Tree Number 1. (Sheet 1 of 2)

5-16

TM 11-6625-2851-14&P

5.

The signal at A12TP1 is high in constant current and constant voltage modes. Since it is assumed only one failure exists, the trouble is localized to

A12, A14, A16, or A17. The "TEST-OPERATE" switch, S1, will be helpful here as it allows you to

TM 11-6625-2851-14&P

COMMENTS

1.

In the constant current mode the current channel drives A12 and is therefore part of the ALC loop.

A large signal at A12TP1 means the test signal is too high and the loop is not bringing it down to normal. The next logical step is to try the constant voltage mode.

2.

3.

In the constant current mode the current channel drives A12 and is therefore part of the ALC loop.

A small signal, or none at all, at A12TP1 indicates no test signal or serious loss of gain in the current channel. Switching to the constant voltage mode would be the next logical step.

A normal signal at this point means the test signal circuits (oscillator and AGC amp), current channel, and leveling loop are ok. The next step is to switch to the constant voltage mode.

6.

In the constant voltage mode the voltage channel drives A12 and is therefore part of the ALC loop.

A low signal means the test signal is too low and the loop is not bringing it up to normal. Since the constant current mode gave a correct reading, the trouble must be in the voltage channel.

7.

break the ALC loop. With the ALC loop open, the

AGC amp has a gain of 1 and the AC level at

A12TP1 should be approx 1.4 V.

In the constant voltage mode the voltage channel drives A12 and is therefore part of the ALC loop.

Since you obtain the correct voltage at A12TP1 in both modes, the trouble must be in the meter or meter detector circuits.

4.

At this point on the troubleshooting path the signal is normal. Therefore the voltage channel and leveling loop are ok. The constant current mode, which you just switched from, gave an incorrect reading at A12TP1. The trouble is then localized to the current channel. Consider A 12K1 as part of the current channel.

8.

The signal at A12TP1 is low in both constant current and constant voltage modes. Since it is assumed only one failure exists, the trouble is localized to A12, A14, A16, or A17. The "TEST-

OPERATE" Switch, S1, will be helpful here as it allows you to break the ALC loop. With the ALC loop open, the AGC amp has a gain of 1 and the

AC level at A12TP1 should be approx 1.4 V.

9.

At this point in the troubleshooting path the signal is normal. Therefore the voltage channel and leveling loop are ok. Since the constant current mode produced an incorrect voltage at A12TP1, check the current channel for loss of gain.


5-17


5-18

TM 11-6625-2851-14&P

TM 11-6625-2851-14&P

COMMENTS

10. At this point you must check for input to the AGC amp. It is normally 0.8 V ±10%. Don't forget the rear panel jumper may be missing.

11. The ALC feedback is now open. With the loop open, DS1 is off and V1 has a very high impedance, causing 100% feedback in the AGC amp. The AGC amp should now have a gain of 1.

12. There is a 1000:1 attenuation from the AGC amp output to J1 in this position of the magnitude range switch. If you have a usable signal, you can check gains through all the channel amplifiers. (The block diagram on Figure 7-1 will bq a help for this.)


5-19

FREQUENCY SENSITIVE TROUBLES

TM 11-6625-2851-14&P


5-20

TM 11-6625-2851-14&P

COMMENTS

13.

DO NOT USE THIS CHART if you have a significant magnitude failure. Troubles pertaining to this chart will be phase errors with small magnitude errors. Before making a decision be sure to check operation on all frequency ranges.

14.

With both filter amplifiers shorted out the error decreased. This means one of the amplifiers is not introducing enough phase shift; thereby causing an incorrect phase relationship between the two channels.

15.

With both filter amplifiers shorted there is no change. This means the problem is not in these filters, but probably in the band pass filters.

16.

It has been determined the trouble is in either A13 or A6. By removing the short from A13 the original error returned. This means A13 is introducing a phase shift, which it should. The trouble must be in A6.

17

19.

would normally cause a change in the phase reading because you are eliminating the phase shift through the A13 board. Since there was no change there must not be any phase shift through this circuit. This is abnormal and the A13 board should be checked.

18.

Removing A10 and shorting input to output eliminates the phase shift that would normally occur in the A10 board. Since the error did not decrease there must not be any phase shift in the

A3 board. This is abnormal; A3 should be checked.

This would normally cause a change in the phase reading because you are eliminating the phase shift through the A10 board. Since there was no change there must not be any phase shift through this circuit. This is abnormal and the A10 board should be checked.


5-21

PHASE TROUBLE ONLY

TM 11-6625-2851-14&P


5-22

TM 11-6625-2851-14&P

COMMENTS

20.

With the Z MAGNITUDE meter reading correctly, you can assume the trouble lies in A6, A7, A8, or 27.

Waveform 3 indicates the Schmitt Trigger is

A13.

operating but the binary is not switching. Check

A8Q1, Q2.

21.

Remember this chart is for phase errors only. It is usually faster to troubleshoot magnitude errors if they exist. Use chart 1 and 3. Prerequisites for starting this tree are: near normal signals at the outputs of current and voltage channel amplifiers

(A4 and All, pin 14).

28.

Waveform 2 indicates both Schmitt Triggers are operating and causing the binary to switch. Check

A8Q3-5.

29.

No waveform at A8(2) indicates no triggers from the current channel. Trouble is in A6 or A7.

22.

A pegged meter indicates the binary is locked in one state. The deflection of the meter indicates which state the binary is in and which channel is possibly defective.

30.

Waveform 3 indicates the Schmitt Trigger is operating but the binary is not switching. Check

A8Q1, Q2.

23.

An on scale reading but not -90° means the binary is ok and being triggered. The next step would be to check the waveform at Q1 collector for proper amplitude. If it is correct, check A8Q4, 5. If it is not, check A8Q3.

24.

A8Q1 is turned off. A waveform check at A8(11) will help localize the trouble.

25.

A8SQ2 is turned off. A waveform check at A8(2) will help localize the trouble

31.

32.

33.

Waveform 2 indicates both Schmitt Triggers are operating and causing the binary to switch. Check

A8Q3-5.

You find the proper input to the Schmitt Triggers

(25 V p-p), therefore the trouble is in A7Q1-3.

No signal at this point means the trouble is in A13.

34.

You find the proper input to the Schmitt Triggers

(25 V p-p), therefore the trouble is in A7Q4-6.

26.

No waveform at A8(11) indicates no triggers from the voltage channel. Trouble is in A7 or A13.

35.

No signal at this point means the trouble is in A6.


5-23/5-24

TM 11-6625-2851-14&P

6-1.

INTRODUCTION

SECTION VI.

REPLACEABLE PARTS

b. Order the parts listed in

Section VIII by the NSN's listed therein.

6-2.

This section contains the information necessary to

order replacement parts. Table 6-1 lists electrical parts

for the 4800A in alpha-numerical order of reference

designation. Table 6-2 is a similar list for the 4801A

plug-in.

6-3.

An exploded view of the instrument and plugin is given in Figure 6-1, showing location of mechanical parts and major electrical parts not located on printed circuit assemblies. The parts in Figure 6-1 are keyed to

the legend in Table 6-3.

6-4.

ORDERING INFORMATION

6-5.

When ordering a replacement part listed in the tables: a. Give the Hewlett-Packard Stock Number and the FSCM when ordering parts not in the Cross

Reference Index (Section VIII).

DESCRIPTION

Model 4800A

Cover, Top

Cover, Bottom

Cover, Side

Cover, Side

Retainer

Rack Mount

Front Panel

Meter Extrusion

Terminal Shield

Model 4801A6-1

Front Panel

STANDARD

5060-8589

5060-8713

5000-8705

5000-8707

5060-8737

5060-8740

04800-01023

00741-01212

00610-61002

04800-01024

HP PART NUMBER

OPTION A85

5060-8589

5060-8713

5000-8705

5000-8707

5060-8737

5060-0775

04800-01001

00741-01209

00610-61001

6-1

04800-101011

OPTION X95

Refer to Manual

Parts List

REF.

A1Q3

A1Q4

A1R1

A1R2

A1R3

A1R4

A1R5

A1R6

A1R7

A1R8

A1R9

A1R10

A1R11

A1R12

A1R13

A1C1

A1C2

A1C3

A1C4

A1C5

A1C6

A1CR1-4

A1L1, 2

A1Q1

A1Q2

A2

A3

A1

A3C1, 2

A3C3

A3C4

A3C5

A3C6

A3C7

A3C8-11

A3C12

A3CR1-10

A3K1

A3L1

A3Q1

A3R1

A3R2

A3R3

A3R4

A3R5

04800-61001

04800-61008

04800-22008

0160-0138

0160-0938

0140-0195

0170-0019

0160-0207

0160-0938

0160-0174

0180-0155

1910-0016

0490-0399

9100-1618

1854-0215

0698-4435

0683-3915

0683-2045

0683-1015

0683-5115

04800-61001

04800-22001

0180-0155

0140-0202

0180-0137

0180-0155

0180-0137

0180-1702

1901-0040

9100-1618

1854-0215

1853-0036

1854-0215

1853-0036

0757-0273

0698-4123

0757-0288

0683-1015

0683-5605

0683-5135

0757-0449

0757-0200

0683-1015

0683-5605

0698-4121

0757-0273

0757-0408

STOCK NO.

TABLE 6-1. REFERENCE DESIGNATION INDEX

DESCRIPTION

UTILITY AMPLIFIER ASSEMBLY

A1 Printed Circuit Board Blank

C: fxd ta 2.2 pF 20% 20 vdcw

C: fxd mica 15 pF 5% 500 vdcw

C: fxd ta 100 pF 20% 10 vdcw




Diode S1

Coil-choke 5.6 pH 10%

Transistor- NPN S1 2N3904

Transistor- PNP S1 2N3906

Transistor-NPN S1 2N3904

Transistor- PNP S1 2N3906

R: fxd met flm 3.01 KS2 1% 1/8 w

R: fxd met flm 499 Q 1% 1/8 w

R: fxd met flm 9.09 1K 1% 1/8 w

R: fxd comp 100 n 5% 1/4 w

R: fxd comp 56 Q 5% 1/4 w

R: fxd comp 51 Kn 5% 1/4 w

R: fxd met flm 20 Kn1 1% 1/8 w

R: fxd, met flm, 5.62K 1%, 1/8W.

R: fxd comp 100 Su 5% 1/4 w

R: fxd comp 56 9 5% 1/4 w

R: fxd met firm 11.3 KS 1% 1/8 w

R: fxd met flm 3.01 Kg 1% 1/8 w

R: fxd met flm 243 n 1% 1/8 w

UTILITY AMPLIFIER Same as Al. Use A2 prefix.

BANDPASS FILTER ASSEMBLY


C: fxd my 0.047 iF 5% 200 vdcw

C: fxd mica 0.001 AF 5% 100 vdcw


C: fxd my 0.1 IF 5% 200 vdcw

C: fxd my 0.01 F 5% 200 vdcw

C: fxd mica 0.001 AF 5% 100 vdcw

C: fxd cer 0.47 pF -20% + 80% 25 vdcw


Diode Ge

Reed relay SPST


Transistor- NPN Si 2N3904

R: fxd met flm 2.49 K

Ω

1% 1/8 w

R: fxd comp 390

Ω

5% 1/4 w

R: fxd comp 200 K

Ω

5% 1/4 w

R: fxd comp 100

Ω

5% 1/4 w

R: fxd comp 510

Ω

5% 1/4 w

6-2

TM 11-6625-2851-14&P

REF.

A3R6

A3R7

A3R8

A3R9

A3R10

A3R11

A3R12

A3R13

A3R14

A3R15

A3R16

A3R17

A3R18

A3R19

A3R20

A3R21

A3R22

A3R23

A3R24

A3R25

A4

A5

A5C1

A5C2

A5C3

A5C4

A5C5

A5C6-8

A5C9

A5CR1-2

A5CR3-5

A5CR6, 7

A5E1

A5K1

A5L1, 2

A5Q1, 2

A5Q3

A5Q4

A5Q5

A5R1

A5R2

A5R3

A5R4, 5

A5R6

TM 11-6625-2851-14&P

0683-2035

0683-1035

0683-5135

0698-4123

0683-1035

0698-4014

0683-2045

0683-2225

0683-2035

0683-2225

0683-2045

0683-1025

0683-2035

0683-1025

0683-2045

0683-1025

0683-2035

0683-1025

0683-1035

0683-2045

04800-61001

04800-61009

04800-22009

0160-2150

0180-0155

0150-0093

0180-0155

0140-0202

0180-1702

0180-0155

1910-0016

1901-0040

1910-0022

04800-81003

0490-0393

9100-1618

1853-0036

1854-0215

1853-0036

0683-4715

0683-1035

0698-4014

0757-0280

0683-2015

TABLE 6-1. REFERENCE DESIGNATION INDEX (CONT)

STOCK NO.

DESCRIPTION

R: fxd comp 20 K

Ω

5% 1/4 w

R: fxd comp 10 K

Ω

5% 1/4 w

R: fxd comp 51 K

Ω

5% 1/4 w

R: fxd met flm 499

Ω

1% 1/8 w

R: fxd comp 10 K

Ω

5% 1/4 w

R: fxd met flm 787

Ω

1% 1/8 w

R: fxd comp 200 K

Ω

5% 1/4 w

R: fxd comp 2.2 K

Ω

5% 1/4 w

R: fxd comp 20 K

Ω

5% 1/4 w

R: fxd comp 2.2 K

Ω

5% 1/4 w

R: fxd comp 200 K

Ω

5% 1/4 w

R: fxd comp 1 K

Ω

5% 1/4 w

R: fxd comp 20 K

Ω

5% 1/4 w

R: fxd comp 1 K

Ω

5% 1/4 w

R: fxd comp 200 K

Ω

5% 1/4 w

R: fxd comp 1 K

Ω

5% 1/4 w

R: fxd comp 20 K

Ω

5% 1/4 w

R: fxd comp 1 K

Ω

5% 1/4 w

R: fxd comp 10 K

Ω

5% 1/4 w

R: fxd comp 200 K

Ω

5% 1/4 w

UTILITY AMPLIFIER Same as Al. Use A4 prefix.

DETECTOR ASSEMBLY

NOTE: Replacement assemblies do not include R21 which must be selected.




C: fxd cer 0.01 pF -20% + 80% 100 vdcw





Diode Ge

Diode Si

Diode Ge

Transistors- 2N3904 matched pair

Reed relay SPDT

Coil-choke 5.6 TH 10%

Transistor Si 2N3904 NSR P/O A5E1

Transistor - PNP Si 2N3906

Transistor - NPN Si 2N3904

Transistor- PNP Si 2N3906

R: fxd comp 470 0 5% 1/4 w

R: fxd comp 10 K

Ω

5% 1/4 w

R: fxd met flm 787 Q 1% 1/8 w

R: fxd met flm 1 K

Ω

1% 1/8 w

R: fxd comp 200

Ω

5% 1/4 w

6-3

REF.

A6C1-3

A6C4

A6C5

A6C6

A6C7

A6C8

A6C9

A6C10, 11

A6C12, 13

A6CR1-6

A6CR7-10

A6L1, 2

A6Q1

A6Q2

A6Q3

A6Q4

A6R1

A6R2

A6R3

A6R4

A6R5

A6R6

A6R7

A6R8

A6R9

A6R10

A6R11

A6R12

A6R13

A6R14

A5R7

A5R8

A5R9

A5R10

A5R11

A5R12

A5R13

A5R14

A5R15

A5R16, 17

A5R18

A5R19

A5R20

A5R21

A5R22

A5R23

A5R24

A5R25

A5TP1

A6

0757-0435

0683-1015

0757-0273

0698-3497

0683-1535

0683-1005

0683-1015

0757-0437

0683-1015

0683-5605

0757-0446

0698-3225

0683-3355

0683-1055

0683-2255

0683-1015

0757-0280

0683-1015

0360-0479

04800-61010

04800-22010

0160-0174

0170-0019

0160-0207

0160-0938

0160-0335

0180-0137

0140-0202

0180-1702

0180-0155

1910-0016

1901-0040

9100-1618

1854-0215

1853-0036

1854-0215

1853-0036

0698-4014

0683-2225

0683-2035

0683-2225

0683-1055

0683-2225

0683-2035

0683-2225

0683-1055

0683-2225

0683-2035

0683-2225

0683-1055

0683-5135


STOCK NO.

DESCRIPTION


Ω

1% 1/8 w

R: fxd comp 100

Ω

5% 1/4 w


Ω

1% 1/8 w


Ω

1% 1/8 w

R: fxd comp factory selected typical 15 K

Ω

5% 1/4 w

R: fxd comp 10

Ω

5% 1/4 w

R: fxd comp 100

Ω

5% 1/4 w


Ω

1% 1/8 w

R: fxd comp 100

Ω

5% 1/4 w

R: fxd comp 56

Ω

5% 1/4 w

R: fxd met flm 15 K

Ω

1% 1/8 w


Ω

1% 1/8 w

R: fxd comp 3.3 M

Ω

5% 1/4 w

R: fxd comp factory selected typical 1 M

Ω

5% 1/4 w

R: fxd comp 2.2 M

Ω

5% 1/4 w

R: fxd comp 100

Ω

5% 1/4 w

R: fxd met flm 1 K

Ω

1% 1/8 w

R: fxd comp 100

Ω

5% 1/4 w

Terminal - solder lug, P. C. mtg.

FILTER AMP ASSEMBLY


C: fxd cer 0.47 pF -20% + 80% 25 vdcw

C: fxd my 0.1 pF 5% 200 vdcw

C: fxd my 0.01 pF 5% 200 vdcw

C: fxd mica 0.001 pF 5% 100 vdcw






Diode Ge

Diode Si

Coil-choke 5.6 /H 10%

Transistor-NPN Si 2N3904




R: fxd met flm 787

Ω

1% 1/8 w

R: fxd comp 2.2 K

Ω

5% 1/4 w

R: fxd comp 20 K

Ω

5% 1/4 w

R: fxd comp 2.2 K

Ω

5% 1/4 w

R: fxd comp 1 M

Ω

5% 1/4 w

R: fxd comp 2.2 K

Ω

5% 1/4 w

R: fxd comp 20 K

Ω

5% 1/4 w

R: fxd comp 2.2 K

Ω

5% 1/4 w

R: fxd comp 1 M

Ω

5% 1/4 w

R: fxd comp 2.2 K

Ω

5% 1/4 w

R: fxd comp 20 K

Ω

5% 1/4 w

R: fxd comp 2.2 K

Ω

5% 1/4 w

R: fxd comp 1 M

Ω

5% 1/4 w

R: fxd comp 51 K

Ω

5% 1/4 w

6-4

TM 11-6625-2851-14&P

REF.

A7R9

A7R10

A7R11

A7R12

A7R13

A7R14

A7R15

A7R16

A7R17

A7R18

A8

A7C1

A7C2

A7C3

A7C4, 5

A7C6

A7C7

A7C8

A7CR1-6

A7 L1

A7L2

A7L3, 4

A7L5

A7L6

A7Q1-6

A7R1

A7R2

A7R3

A7R4

A7R5

A7R6

A7R7

A7R8

A6R15

A6R16

A6R17

A6R18

A6R19

A6R20

A6R21

A6R22, 23

A6R24

A6R25

A6R26

A7

A8C1

A8C2

A8C3

0757-0401

0757-0411

0757-0427

0757-0879

0757-0437

0757-0436

2100.-3(%

0757-0273

0757-0437

0757-0401

0757-0411

0752-0427

0757-0879

0757-0437

0757-0273

0698-4123

0757-0288

0683-1015

0757-0449

0757-0200

0683-1015

0683-5605

0698-4121

0757-0273

0757-0419

04800-61013

04800-22013

0180-0155

0140-0204

0140-0192

0180-0155

0140-0204

0140-0192

0180-0155

1901-0040

9100-1618

9140-0107

9100-1618

9140-0107

9100-1618

1854-0215

0757-0436

2100-1642

0757-0273

0757-0437

04800-61014

04800-22014

0180-0155

0160-0174

0180-0139


STOCK NO.

DESCRIPTION


Ω

1% 1/8 w

R: fxd met flm 499

Ω

1% 1/8 w


Ω

1% 1/8 w

R: fxd comp 100

Ω

5% 1/4 w

R: fxd met flm 20 K

Ω

1% 1/8 w


Ω

1% 1/8 w

R: fxd comp 100

Ω

5% 1/4 w

R: fxd comp 56

Ω

5% 1/4 w


Ω

1% 1/8 w


Ω

1% 1/8 w

R: fxd met flm 681

Ω

1% 1/8 w

SCHMITT TRIGGER









Diode Si


Coil fxd RF 27 pH


Coil fxd RF 27 pH

Coil-choke 5.6 tpH 10%


R: fxd met flm 100

Ω

1% 1/8 w

R: fxd met flm 332

Ω

1% 1/8 w


Ω

1% 1/8 w


Ω

1% 1/4 w


Ω

1% 1/8 w


Ω

1% 1/8 w

R: var ww 10-turn 1 K

Ω

5% 3/4 w


Ω

1% 1/8 w


Ω

1% 1/8 w

R: fxd met firm 100

Ω

1% 1/8 w

R: fxd met flm 332

Ω

1% 1/8 w


Ω

1% 1/8 w


Ω

1% 1/4 w


Ω

1% 1/8 w


Ω

1% 1/8 w

R: var ww 10-turn 1 K

Ω

5% 3/4 w


Ω

1% 1/8 w


Ω

1% 1/8 w

PHASE DETECTOR



C: fxd cer 0.47 pF-20 + 80% 25 vdcw

C: fxd alum 200 pF-10% + 100% 3 vdcw NP

6-5

TM 11-6625-2851-14&P

TM 11-6625-2851-14&P

REF.

A8R15

A8R16

A8R17

A8R18

ASR19

A8R20

A9

A10

A11

A12

A8C4

A8CR1-8

A8L1, 2

A8Q1, 2

A8Q3-5

A8R1, 2

A8R3, 4

A8R5

A8R6

A8R7

A8R8

A8R9

A8R10, 11

A8R12

A8R13

ASR14

A12R21

A13

A14


STOCK NO.

DESCRIPTION

0180-0155

1901-0040

9100-1618

1853-0009

1854-0215

0683-8235

0698-3497

0698-4444

0698-3497

0698-0064

0757-0442

0757-0431

0757-1099

0698-3558

0757-0431

0698-3558

0757-0827

2100-1757

0698-0086

0757-0827

2100-1758

0757-0280

04800-61001

04800-61008

04800-61001

04800-61009

A14C1

A14C2, 3

A14C4

A14CR1-4

0180-0155

0180-0374

A14CR5, 6 1901-0040

A14E1 04800-81004

A14E2

A14L1, 2

04800-81003

9100-1618

A14Q1, 2

A14Q3,

A14Q5, 6

A14Q7

0683-1055

04800-61010

04800-61016

04800-22016

41853-0036

1854-0071

C: fxd ta 2.2 #F 20% 20 vdcw

Diode Si


Transistor - PNP Si


R: fxd comp 82 K

Ω

5% 1/4 w


Ω

1% 1/8 w


Ω

1% 1/8 w


Ω

1% 1/8 w


Ω

1% 1/8 w

R: fxd met flm 10 K

Ω

1% 1/8 w


Ω

1% 1/8 w

R: fxd met flm 900

Ω

1% 1/8 w


Ω

1% 1/8 w


Ω

1% 1/8 w

R: fxd met flm 4.02 M

Ω

1% 1/8 w


Ω

1% 1/2 w

R: var ww 500

Ω

10% 1/2 w

R: fxd met firm 2.87 K

Ω

1% 1/4 w


Ω

1% 1/2 w

R: var ww 1 K

Ω

10% 1/2 w

R: fxd met flm 1 K

Ω

1% 1/8 w

UTILITY AMPLIFIER Same as A1. Use A9 prefix.

BANDPASS FILTER Same as A3. Use A10 prefix.

UTILITY AMPLIFIER Same as Al. Use All prefix.

DETECTOR ASSEMBLY Same as A5. Use A12 prefix.

NOTE: Replacement assemblies do not include R21.

Add resistor listed below before installing assembly.

R: fxd comp 1 M

Ω

5% 1/4 w

FILTER AMP ASSEMBLY Same as A6. Use A13 prefix.

DC AMPLIFIER


Not assigned



Not assigned

Diode Si

Transistors - 2N3906 matched pair



Transistor-PNP Si 2N3906 NSR P/O A14E1


Transistor-NPN Si 2N3904 NSR P/O A14E2

Transistor - NPN Si similar to 2N3391

6-6


STOCK NO.

DESCRIPTION REF.

A14Q8

A14Q9

A14Q10

A14R1

1854-0215

1854-0039

1205-0033

1853-0036

0683-1015

0757-0280

0683-1015

A14R2

A14R3

A14R4-7

A14R9

A14R10-12

A14R13

0757-0288

0683-1015

A14R14 0757-0465

A14R15, 16 0757-0437

A14R17 0757-0465

A14R18 2100-1755

A14R19, 20 0757-0427

A14R21

A14R22

A14R23

A14R24

A14R25

A14R26

A14R27

0757-0274

0683-1015

0698-4406

2100-1654

0757-0738

0698-3497

A14R28

A14R29

A14R30

0683-1015

0698-3403

0698-3497

A14R31 0757-0439

A14R32, 33 0757-0427

A14R34

A14R35

A14R36

0757-0273

0698-3153

0757-0442

A14R37

A14R38

A14TP1-4

A15

0757-0447

0757-0288

0360-0479

A15CR1-6

A15Q1

A15Q2, 3

A15Q4

A15Q5

04800-61012

04800-22012

1901-0040

1854-0215

1853-0036

1854-0215

1853-0036

A15Q6, 7

A15Q8, 9

1854-0215

1853-0036

A15Q10, 11 1854-0215

A15Q12 1853-0036

A15R1, 2

A15R3

A15R4-6

A15R7

A15R8

0683-1015

0757-0273

0757-0280

0757-0427

0757-0273



Heat dissipater (use with A14Q9)


R: fxd comp 100

Ω

5% 1/4 w


Ω

1% 1/8 w

R: fxd comp 100 n 5% 1/4 w

Not assigned

R: fxd met flm 9.09K, 1%, 1/8W.

Not assigned

R: fxd comp 100

Ω

5% 1/4 w

R: fxd met flm 100 K

Ω

1% 1/8 w


Ω

1% 1/8 w


Ω

1% 1/8 w

R: var ww 100

Ω

10% 1 w


Ω

1% 1/8 w

Not assigned


Ω

1% 1/4 w

R: fxd comp 100

Ω

5% 1/4 w

R: fxd met flm 115

Ω

1% 1/8 w

R: var ww 20-turn 100

Ω

10% 1/2 w


Ω

1% 1/4 w


Ω

1% 1/8 w

R: fxd comp 100

Ω

5% 1/4 w

R: fxd met flm 348

Ω

1% 1/2 w


Ω

1% 1/8 w


Ω

1% 1/8 w


Ω

1% 1/8 w


Ω

1% 1/8 w


Ω

1% 1/8 w

R: fxd met flm 10 K

Ω

1% 1/8 w


Ω

1% 1/8 w


Ω

1% 1/8 w

Terminal- solder lug, P.C. mtg.

ANALOG BOARD ASSEMBLY


Diode Si



Transistor-NPN Si 2N3904






R: fxd comp 100

Ω

5% 1/4 w


Ω

1% 1/8 w

R: fxd met flm 1 K

Ω

1% 1/8 w


Ω

1% 1/8 w


Ω

1% 1/8 w

6-7

TM 11-6625-2851-14&P

REF.

A15R9

A15R10

A15R11

A15R12

A15R13

0757-0434

0757-0273

0683-1015

0757-0273

0757-0439

A15R14 0757-0280

A15R15, 16 0683-1015

A15R17 0757-0273

A15R18-20 0757-0280

A15R21 0757-0427

A15R22

A15R23

A15R24

A15R25

A15R26

A15R27

A15R28

A15R29

A16

A16C1

A16C2

A16C3

A16C4

A16C5, 6

A16C7

A16C8

A16C9

A16C10

A16CR1-9

A16CR10

A16E1

A16Q1

A16Q2

A16Q3

A16Q4

A16Q5, 6

A16Q7, 8

A16R1

A16R2

A16R3

A16R4

A16R5

A16R6

A16R7

0757-0273

0698-4123

0757-0446

0757-0449

0757-0288

A16R8

A16R9

0757-0449

0757-0200

A16R10, 11 0683-1015

A16R12, 13 0683-5605

A16R14 0757-0446

A16R15 0757-0269

0757-0273

0757-0434

0757-0273

0683-1015

0757-0273

0757-0439

0757-0280

0698-4484

04800-61003

04800-22003

0121-0105

0160-2198

0180-0228

0150-0093

0180-1765

0180-0141

0160-0157

0180-0141

0160-0157

1901-0040

1902-0049

5080-1718

1854-0215

1853-0036

1854-0215

1853-0036

1854-0215

1853-0036

0757-0273

0683-1015


STOCK NO.

DESCRIPTION


Ω

1% 1/8 w


Ω

1% 1/8 w

R: fxd comp 100

Ω

5% 1/4 w


Ω

1% 1/8 w


Ω

1% 178 w

R: fxd met flm 1 K

Ω

1% 1/8 w

R: fxd comp 100

Ω

5% 1/4 w


Ω

1% 1/8 w

R: fxd met flm 1 K

Ω

1% 1/8 w


Ω

1% 1/8 w


Ω

1% 1/8 w

R: fxd met flm 3'.65 K

Ω

1% 1/8 w


Ω

1% 1/8 w

R: fxd comp 100

Ω

5% 1/4 w


Ω

1% 1/8 w


Ω

1% 1/8 w

R: fxd met flm 1 K

Ω

1% 1/8 w


Ω

1% 1/8 w

OSCILLATOR ASSEMBLY


C: var cer 9-35 pF



C: fxd cer 0.01 pF -20% + 80% 100 vdcw


C: fxd alum 50 AF -10% + 75% 50 vdcw

C: fxd my 0.0047 pF 10%

C: fxd alum 50 pF -10% + 75% 50 vdcw

C: fxd my 0.0047 pF 10%

Diode Si

Diode Si brkdwn 6.19 V 5% 400 mW

Lamp assembly






Transistor PNP Si 2N3906


Ω

1% 1/8 w

R: fxd comp 100

Ω

5% 1/4 w


Ω

1% 1/8 w

R: fxd met flm 499

Ω

1% 1/8 w

R: fxd met flm 15 K

Ω

1% 1/8 w

R: fxd met flm 20 K

Ω

1% 1/8 w


Ω

1% 1/8 w

R: fxd met flm 20 K

Ω

1% 1/8 w


Ω

1% 1/8 w

R: fxd comp 100

Ω

5% 1/4 w

R: fxd comp 56

Ω

5% 1/4 w

R: fxd met flm 15 K

Ω

1% 1/8 w

R: fxd met flm 270

Ω

1% 1/8 w

6-8

TM 11-6625-2851-14&P

TM 11-6625-2851-14&P

REF.

A16R16

A16R17, 18

A16R19

A16R20

A16R21

A16R22

A16R23

A16R24

A16R25

0698-4123

2100-1963

0757-0280

0698-3498

0683-1015

0757-0280

0757-0288

A16R26

A16R27

A16R28

A16R29

A16R30

A17

A17C1

A17C2

A17C3

A17C4

A17C5

A17C6-8

A17CR1-8

A17DS1

A17E1

A17L1, 2

A17Q1

A17Q2

A17Q3

A17Q4

A17Q5

A17Q6

A17R1

1990-0079

9100-1618

A17R2

A17R3

A17R4

A17R5

A17R6

A17R7

A17R8

A17R9

0757-0273

0698-4123

0757-0288

0683-1015

0683-5605

0683-5135

0757-0449

0757-0200

0683-1015

A17R10

A17R11

A17R12

A17R13-15

A17R16

A17R17

0683-5605

0698-4121

0683-1025

0757-0440

0698-4435

A17R18, 19 0683-1035

A17R20, 21 0683-5605

0698-3497

0698-3493

0683-1015

0757-0280

0757-0273

04800-61002

04800-22002

0180-0155

0140-0202

0180-0137

0180-0155

0180-1702

0180-0137

1901-0040


STOCK NO.

DESCRIPTION

R: special pos temp coeff approx 100

Ω

NSR P/O A16E1

Lamp INCD GE 5181D 10 V 15 mA. Cold res approx 60

Ω

NSR P/O A16E1

R: fxd met flm 499

Ω

1% 1/8 w

R: var flm 2 K

Ω

R: fxd met flm 1 K

Ω

1% 1/8 w


Ω

1% 1/8 w

R: fxd comp 100 0 5% 1/4 w

R: fxd met flm 1 K

Ω

1% 1/8 w


Ω

1% 1/8 w


Ω

1% 1/8 w


Ω

1% 1/8 w

R: fxd comp 100

Ω

5% 1/4 w

R: fxd met flm 1 K

Ω

1% 1/8 w


Ω

1% 1/8 w

AGC AND MONITOR AMPLIFIER ASSEMBLY








Diode Si

Lamp INCD 6 V NSR P/O A17E1

Photocell lamp module includes A17V1 and A17DS1


1854-0215................................................ Transistor NPN Si 2N3904

1853-0036................................................ Transistor PNP Si 2N3906






Ω

1% 1/8 w

R: fxd met flm 499

Ω

1% 1/8 w


Ω

1% 1/8 w

R: fxd comp 100

Ω

5% 1/4 w

R: fxd comp 56

Ω

5% 1/4 w

R: fxd comp 51 K

Ω

5% 1/4 w

R: fxd met flm 20 K

Ω

1% 1/8 w


Ω

1% 1/8 w

R: fxd comp 100

Ω

5% 1/4 w

R: fxd comp 56

Ω

5% 1/4 w


Ω

1% 1/8 w

R: fxd comp 1 K

Ω

5% 1/4 w

Not assigned


Ω

1% 1/8 w


Ω

1% 1/8 w

R: fxd comp 10 K

Ω

5% 1/4 w

R: fxd comp 56

Ω

5% 1/4 w

6-9

TM 11-6625-2851-14&P

REF.

A17R22

A17R23

A17V1

A18

0683-1035

0757-0416

A18C1

A18C2

A18C3

A18C4

A18C5

A18C6

A18C7

A18CR1

A18CR2

A18CR3

A18CR4

A18CR5

A18CR6

A18CR7

A18CR8

A18E1

A18E2

A18Q1

A18Q2-4

A18Q5, 6

A18Q7

A18Q8-10

A18Q11, 12

A18R1

A18R2

A18R3

A18R4

A18R5

A18R6

A18R7

1854-0215

1853-0036

A18R8

A18R9

A18R10

A18R11

A18R12

0683-1525

0683-3935

0683-1235

0683-1015

0689-1525

0683-1125

0683-1035

0812-0077

0683-2035

0683-3315

0683-2025

0683-2035

A18R13, 14 0683-5105

A18R15 0683-1035

A18R16 2100-3152'

A18R17

A18R18

A18R19

A18R20

A18R21

0683-1025

0683-1525

0683-3935

0683-2035

0683-1015

04800-61004

04800-22004

0160-0818

0140-0234

0180-0141

0180-0158

0160-0818

0140-0234

0180-0158

1902-0049

1902-0018

1902-3181

1902-0071

1902-0049

1901-0040

1902-0018

1902-3181

04800-81001

04800-81002


STOCK NO.

DESCRIPTION

R: fxd comp 10 K

Ω

5% 1/4 w

R: fxd met flm 511

Ω

1% 1/8 w

Photocell special NSR P/O A17E1

20 V REGULATOR ASSEMBLY


C: fxd cer 0.02 AF 20% 50 vdcw


C: fxd alum 50 pF -10% + 75% 50 vdcw

C: fxd alum 500 pF -10% + 75% 25 vdcw

C: fxd cer 0.02 pF 20% 50 vdcw


C: fxd alum 500 pF -10% + 75% 25 vdcw




Diode Si brkdwn 9 V 5% temp comp


Diode Si



Transistors - 2N3904 matched pair



Transistor NPN Si 2N3904

Transistor NPN Si 2N3904 NSR P/O A18E1



Transistor PNP Si 2N3906 NSR P/O A18E2

R: fxd comp 1.5 K

Ω

5% 1/4 w

R: fxd comp 39 K

Ω

5% 1/4 w

R: fxd comp 12 K

Ω

5% 1/4 w

R: fxd comp 100

Ω

5% 1/4 w

R: fxd comp 1.5 K

Ω

5% 1/4 w

R: fxd comp 1.1 K

Ω

5% 1/4 w

R: fxd comp 10 K

Ω

5% 1/4 w

R: fxd ww 3

Ω

5% 2 w

R: fxd Comp 20 K

Ω

2 5% 1/4 w

R: fxd comp 330

Ω

5% 1/4 w

R: fxd comp 2 K

Ω

5% 1/4 w

R: fxd comp 20 K

Ω

5% 1/4 w

R: fxd comp 51

Ω

5% 1/4 w

R: fxd comp 10 K

Ω

5% 1/4 w

R: var ww lin 5 K

Ω

10% 1 w

R: fxd comp 1 K

Ω

5% 1/4 w

R: fxd comp 1.5 K

Ω

5% 1/4 w

R: fxd comp 39 K

Ω

5% 1/4 w

R: fxd comp 20 K

Ω

5% 1/4 w

R: fxd comp 100

Ω

5% 1/4 w

6-10

REF.

A18R22

A18R23

A18R24

A18R25

0689-1525

0683-1125

0683-1035

0812-0077

A18R26

A18R27

A18R28

0683-2035

0683-3315

0683-2025

A18R29 0683-2035-

A18R30, 31 0683-5105

A18R32 0683-1035

A18R33, 34 0698-3327

A19 04800-61005

04800-22005

A19C1

A19C2

A19C3

A19C4

0160-0174

0140-0178

0160-0818

0160-0174

A19C5

A19C6

A19C7

0140-0178

0160-0818

0160-0174

A19C8

A19C9

0140-0178

0160-0818

A19C10, 11 0180-0141

A19CR1-5 1902-0049

A19CR6, 7 1901-0040

A19CR8-13 1901-0028

A19Q1-8 1853-0036

A19Q9-12

A19R1

A19R2

1854-0215

0758-0013

0683-1535

A19R3

A19R4

A19R5

A19R6

A19R7

A19R8

A19R9

A19R10

A19R11

0683-1015

0758-0026

0757-0346

0683-1025

0698-3497

0757-0200

0758-0013

0683-1535

0683-1015

A19R12

A19R13

0758-0026

0757-0346.

A19R14, 15 0757-0439

A19R16

A19R17

A19R18

A19R19

A19R20

A19R21

A19R22

A19R23

0758-0026

0683-1535

0683-1015

0758-0026

0757-0346

0683-1025

0698-3497

0757-0200


STOCK NO.

DESCRIPTION

R: fxd comp 1.5 K

Ω

5% 1/4 w

R: fxd comp 1.1 K

Ω

5% 1/4 w

R: fxd comp 10 K

Ω

5% 1/4 w

R: fxd ww 3

Ω

5% 2 w

R: fxd comp 20 K

Ω

5% 1/4 w

R: fxd comp 330

Ω

5% 1/4 w

R: fxd comp 2 K

Ω

5% 1/4 w

R: fxd comp 20 K

Ω

5% 1/4 w

R: fxd comp 51

Ω

5% 1/4 w

R: fxd comp 10 K

Ω

5% 1/4 w


Ω

2 0.5% 1/8 w

RECTIFIER AND 14 V REGULATORS


C: fxd cer 0.47 AF -20% + 80% 25 vdcw

C: fxd mica 560 pF 2%


C: fxd cer 0.47 pF -20% + 80% 25 vdcw



C: fxd cer 0.47 pF -20% + 80% 25 vdcw


C: fxd cer 0.02 /pF 20% 50 vdcw

C: fxd elect alum 50 pF -10% + 75% 50 vdcw


Diode Si

Diode Si



R: fxd met flm 120

Ω

5% 1/2 w

R: fxd comp 15 K

Ω

5% 1/4 w

R: fxd comp 100

Ω

5% 1/4 w

R: fxd met flm 82

Ω

5% 1/2 w

R: fxd met flm 10, 5%, 114W.

R: fxd comp 1 K

Ω

5% 1/4 w


Ω

1% 1/8 w


Ω

1% 1/8 w

R: fxd met flm 120 I 5% 1/2 w

R: fxd comp 15 K

Ω

5% 1/4 w

R: fxd comp 100

Ω

5% 1/4 w

R: fxd met flm 82

Ω

5% 1/2 w

R: fxd met flm 10

Ω

, 5%, 1/4W.


Ω

1% 1/8 w

R: fxd met flm 82

Ω

5% 1/2 w

R: fxd comp 15 KQ 5% 1/4 w

R: fxd comp 100

Ω

5% 1/4 w

R: fxd met flm 82

Ω

5% 1/2 w

R: fxd met flm 10

Ω

, 5%, 1/4W.

R: fxd comp 1 K

Ω

5% 1/4 w


Ω

1% 1/8 w


Ω

1% 1/8 w

6-11

TM 11-6625-2851-14&P

TM 11-6625-2851-14&P


STOCK NO.

DESCRIPTION REF.

A20

A20L1

A20R1

A20R2

A20R3

A20R4

A20R5

A20R6

A20R7

A20R8

A20R9

A20R10

A20R11

A20R12

A20R13

A20R14

A20S1

A21

A21R1

A21R2

A21R3

A21R4

A21R5

A21R6

A21R7

0698-5511

0698-5516

0698-5451

0698-5450

0698-5449

0698-5511

0698-5516

A21R8

A21R9

0698-5451

0698-5450

A21R10

A22C3

A22Q1

0698-5449

A21S1A, B 3100-1611

A22 04800-61030

A22C1A, B 0121-0129

A22C2 0160-2232

0160-0987

A22R1

A22XQ1

1855-0042

0698-3113

1200-0148

04800-61020

9140-0237

0698-5453

0698-4157

0698-4343

0698-5453

0698-4157

0698-4158

0698-5455

0698-5456

0698-5459

0698-5457

0698-5454

0698-5455

0683-560.5

0698-5452

3100-1610

04800-61021

MAGNITUDE SWITCH ASSEMBLY

Coil fxd 200 pH

R: fxd met flm 900

Ω

0.1%o 1/8 w

R: fxd met flm 10 K

Ω

0.1% 1/8 w

R: fxd met flm 100

Ω

0.1% 1/8 w

R: fxd met flm 900

Ω

0.1% 1/8 w

R: fxd met flm 10 K

Ω

0.1% 1/8 w

R: fxd met flm 100 K1

Ω

0.1% 1/8 w

R: fxd met flm 9990

Ω

0.1%c 1/8 w

R: fxd met flm 90

Ω

0.1% 1/8 w

R: fxd met flm 9900

Ω

0.1% 1/8 w

R: fxd met flm 990

Ω

0.1% 1/8 w

R: fxd met flm 9000

Ω

0.1% 1/8 w

R: fxd met flm 9990

Ω

0.1% 1/8 w

R: fxd comp 56

Ω

5% 1/4 w

R: fxd met flm 10 2 0.1% 1/8 w

Switch less components

OSCILLATOR SWITCH ASSEMBLY

R: fxd met flm 50 M

Ω

1% 2 watts.

R: fxd met flm 5 M

Ω

0.1% 2 watts


Ω

0.1% 1/8 w

R: fxd met flm 50 K

Ω

0.1% 1/8 w

R: fxd met flm 5 K

Ω

0.1% 1/8 w

R: fxd met flm 50 M

Ω

1% 1 w

R: fxd met flm 5 M

Ω

I 0.1% 1 w

R: fxd met flm 500

Ω

0.1% 1/8 w

R: fxd met flm 50 K

Ω

0.1% 1/8 w

R: fxd met flm 5 K

Ω

0.1% 1/8 w

Switch less components

VARIABLE CAPACITOR ASSEMBLY

C: var air 2 sect 14.75/617.75 pF



1855-0062....................................... Transistor field effect N Channel

Transistor field effect N Channel 2N4303 (alt repl)

R: fxd comp 100 Q2 5% 1/8 w

Socket transistor teflon

6-12

R9

R10

R11

R12, 13

S1

S2

53

T1

W1

XA1-15

XA16-19

XA20-22

XA23

XQ1, 2

M1

M2

Q1, 2

R1

R2

R3

R4

R5

R6

R7

R8

C1

C2

C3

C4, 5

C6

CP1

CP2

CP3

C7

CR1, 2

F1

DS1

J1

REF.

J2

J3-5

J6

J7

TM 11-6625-2851-14&P

0180-0228

0160-2232

0180-1956

0150-0123

1250-0076

1250-0216

1250-0n76f

80160-2108

1910-0016 or 21100201.

2110020.

2140-0052

1250-0140

1250-0051

1252-2357.

1250-0001

1250-0140

1250-0051

1250-0140

1250-0051

1120-0339

1120-0338

1854-0072

2100-2399

2100-2386

0757-0434

0683-3005

0686-3335

2100-2291

2100-2290

2100-2291

2100-2290

2100-0789

0683-4705

3101-0045

3101-0852

3101-1234

9100-0405

8120-1348

1251-0135

1251-0194

1251-0135


STOCK NO.

DESCRIPTION

CHASSIS COMPONENTS



C : not used after serial prefix 816.

C: lxd alum 500 pF -10%lO + 751% 50 vdcw

C: fxd cer 0.001 20% 250Vac.

Adapter BNC right angle Dend

Adapter BNC male-male straight

Adapter BNC right angle bend

C: fxd cer O.002 pF 20% 25OVac.

Diode Ge

Fuse cartridge 3 AG 1/2 A SLO BLO (115 V operation)

Fuse cartridge 3 AG 1/4 A SLO BLO (230 V operation)

Lamp neon (P/O S2)

P/O cable assembly 04800-61031

J1 outer body only

Center pin only

Power socket

Connector BNC panel mtg jack


J6 outer body only

Center pin only


J7 outer body only

Center pin only

Meter MAGNITUDE

Meter PHASE ANGLE


Not assigned

R: var comp lin 100

Ω

20% 1/2 w

R: var comp lin 100 K

Ω

20% 1/2 w


Ω

1% 1/8 w

R: fxd comp 30

Ω

5% 1/4 w

R: fxd comp 33 K

Ω

5% 1/4 w

R: var car comp 1 K

Ω

10% 1/2 w

R: var comp lin 500 S

Ω

10% 1/2 w

R: var car comp 1 K

Ω

10% 1/2 w

R: var comp lin 500

Ω

10% 1/2 w

R: var comp lin 1 K

Ω

10% 2.25 w

R: fxd comp 47

Ω

5% 1/4 w

Switch slide DPDT

Power Switch

Switch slide DPDT

Power transformer

Power cord

Connector PC board socket 15 pin


Not assigned


1200-0168.................................................... Socket transistor TO-66

6-13

TABLE 6-2. REFERENCE DESIGNATION INDEX

REF. STOCK NO. DESCRIPTION

4801A DIRECT MEASUREMENT PLUG-IN

04800-22007 Printed Circuit Board Blank

C1 0121-0060 C: var cer 2-8 pF 300 vdcw

C2 0180-0137 C: fxd ta 100 pF 20% 10 vdcw

C3 0180-0155 C: fxd ta 2.2 pF 20% 20 vdcw

C4 0140-0195 C: fxd mica 130 pF 5% 300 vdcw



C7 0140-0203 C: fxd mica 30 pF 5%


C9 0140-0203 C: fxd mica 30 pF 5%

C10 0180-0155 C: fxd ta 2.2 pF 20% 20 vdcw




C14 0180-0155 C: fxd ta 2.2 pF 20% 20 vdcw


C16 0180-0155 C: fxd ta 2.2 pF 20% 20 vdcw


C18 0180-0224 C: fxd alum 10 AF -10% + 75% 15 vdcw

CR1, 2 1910-0016 Diode Ge

CR3, 4 1901-0040 Diode Si

E1 04800-81001 Transistors - 2N3904 matched pair

J1 04800-21002 Binding post

1510-0029 Nut-binding post red

J2 04800-21002 Binding post

1510-0029 Nut-binding post red

K1, 2 0490-0393 Relay reed SPDT

K3 0490-0339 Relay reed SPDT

K4 0490-0393 Relay reed SPYT

L1 9170-0894 Bead-ferrite

L2 9100-1618 Coil-choke 5.6 pH 10%

L3 9140-0179 Coil-choke 22 pH 10%

L4, 5 9100-1618 Coil-choke 5.6 pH 10%

L6 Not assigned

Q1 1853-0036 Transistor PNP Si 2N3906

Q2 1854-0215 Transistor NPN Si 2N3904



Q5 1854-0215 Transistor NPN Si 2N3904


Q7, 8 Transistor NPN Si 2N3904 NSR P/O El


Q10, 11 1854-0215 Transistor NPN Si 2N3904

R1 0683-4755 R: fxd comp factory selected typical 4.7 M

Ω

5% 1/4 w

R2 0683-1035 R: fxd comp 10 K

Ω

5% 1/4 w

R3 0757-0449 R; fxd met flm 20 K

Ω

1% 1/8 w

R4 0757-0273 R: fxd met flm 3.01 K

Ω

1% 1/8 w

R5 0698-4406 R: fxd met flm 115

Ω

1% 1/8 w

R6 0757-0280 R: fxd met flm 1 K

Ω

1% 1/8 w

R7, 8 0698-3226 R: fxd met flm 6.49 K

Ω

1% 1/8 w

6-14

TM 11-6625-2851-14&P

REF.

R22

R23

R24, 25

R26

R27

R28

R29

R30

R31

R32

R33

R34

R35s

R36

R37

R38

R9

R10

R11

R12, 13

R14

R15

R16

R17

R18

R19

R20

R21

0757-0449

0698-4406

0757-0273

0683-1015

0757-0427

0698-4123

2100-1773

0698-0083

0683-1005

0698-3497

0683-2015

0698-3226

0757-0442

0757-0401

0757-0437

0683-1005

0683-2015

0683-5105

0757-0442

0683-2015

0683-1805

0757-0427

0698-4343

0698-5453

0698-5456

0698-5452

0683-6805

0757-0280


STOCK NO.

DESCRIPTION

R: fxd met flm 20 K

Ω

1% 1/8 w

R: fxd met flm 115

Ω

1% 1/8 w


Ω

1% 1/8 w

R: fxd comp 100

Ω

5% 1/4 w


Ω

1% 1/8 w

R: fxd met flm 499

Ω

1% 1/8 w

R: var ww lin 1 K

Ω

10% 1/2 w


Ω

1% 1/8 w

R: fxd comp 10

Ω

5% 1/4 w


Ω

1% 1/8 w

R: fxd comp 200

Ω

5% 1/4 w


Ω

1% 1/8 w

R: fxd met flm 10 K

Ω

1% 1/8 w

R: fxd met flm 100

Ω

1% 1/8 w


Ω

1% 1/8 w

R: fxd comp 10

Ω

5% 1/4 w

R: fxd comp 200

Ω

5% 1/4 w

R: fxd comp 51

Ω

5% 1/4 w

R: fxd met flm 10 K

Ω

1% 1/8 w

R: fxd comp 200

Ω

5% 1/4 w

R: fxd comp 18

Ω

5% 1/4 w


Ω

1% 1/8 w

R: fxd met flm 100

Ω

0.1% 1/8 w

R: fxd met flm 9P0

Ω

0.1% 1/8 w

R: fxd met flm 90 0

Ω

0.1% 1/8 w

R: fxd met flm 10

Ω

0.1% 1/10 w

R: fxd comp 68

Ω

5% 1/4 w

R: fxd met flm 1 K

Ω

1% 1/8 w

6-15

TM 11-6625-2851-14&P

TM 11-6625-2851-14&P

Figure 6-1

Index No.

40

41

42

43

44

45

34

35

36

37

38

39

46

47

48

49

50

27

28

29

30

21

22

23

24

25

26

31

32

33

15

16

17

18

19

20

9

10

11

12

13

14

5

6

7

8

3

4

1

2

Stock No.

04800-01010

1460-0156

04800-21004

04800-61041

04800-21001

04800-61040

1460-0154

04800-21003

2200-0103

04800-61021

2950-0069

2190-0022

0510-0228

1410-0760

04800-01002

---------

04800-21005

3030-0160

2260-0002

2190-0086

3030-0033

1500-0033

3101-0100

3050-0294

04800-01001

7120-1254

2200-0139

2200-0141

04800-21010

2200-0141

5040-0305

2360-0182

5060-0740

04800-01009

2420-0009

2190-0006

---------

1400-0265

0360-0402

---------

1200-0168

0360-0364

0340-0140

---------

0624-0078

5040-0631

2360-0197

04800-01017

1200-0148

---------

3050-0010

TABLE 6-3. REPLACEABLE PARTS INDEX

Description

Screw-machine 6-32 x 5/16 FH POZI SS .....................................................

Cover-top ....................................................................................................

Shield-oscillator compartment......................................................................

Nut-hex 6-32 1/4 AF 3/32 THK SS ...............................................................

Lockwasher helical No. 6 heavy SS ............................................................

C8 see Table 6-1

Strap-cable for 1-3/4 D cable nylon ..............................................................

Terminal strip 2 INS 1 GRD .........................................................................

C9 see Table 6-1

Socket-transistor for TO-66 case .................................................................

Terminal strip 2 INS 1 GRD .........................................................................

Insulator-transistor mica ..............................................................................

Q1 see Table 6-1

Screw-tapping 6-32 x 3/8 PH POZI STL CP .................................................

Bracket-capacitor MTG ................................................................................

Screw-machine 6-32 x 3/8 PH POZI SS .......................................................

Bracket-transistor MTG................................................................................

Socket-transistor 3 pin teflon .......................................................................

C1 see Table 6-1

Washer-flat 3/16 PD BRS NP No. 6 ............................................................

Cover-oscillator compartment ......................................................................

Spring .136D .346L 7T.................................................................................

Pulley analog drive ......................................................................................

String assembly-analog drive.......................................................................

Pulley-capacitor drive ..................................................................................

String assembly-capacitor drive ...................................................................

Spring .125D . 625L 12T.............................................................................

Pulley-capacitor drive ..................................................................................

Screw-machine 4-40 x 1/4 PH POZI SS W/LOCK ........................................

Switch assembly-FREQ RANGE..................................................................

Nut-hex 3/8-32 1/2 AF 3/32 THK SS ............................................................

Lockwasher INT PH BRZ' NP HEAVY for 3/8 stud........................................

Ring-retaining EXT E type 1/4 SHFT............................................................

Bearing-ball flanged 5/8 OD x 1/4 ID............................................................

Panel-sub ....................................................................................................

R11see Table 6-1

Shaft-drive...................................................................................................

Screw-set 6-32 x 3/4 HEX DR CUP PT ........................................................

Nut-hex 4-40 3/16 AF 1/16 THK SS .............................................................

Lockwasher helical No. 4 light PH BRZ NP .................................................

Screw-set 6-32 x 3/16 hex DR CUP PT ........................................................

Ball-drive 6-1 reduction................................................................................

Switch-pushbutton SPDT lighted red lens.....................................................

Washer-flat 9/32 OD BRS NP No. 4............................................................

Panel-front...................................................................................................

Plate-identification .......................................................................................


Screw-machine 4-40 x 5/16 PH POZI SS .....................................................

Indicator ......................................................................................................


Lamp Base

6-16

Qty.

4

2

22

1

1

2

1

2

3

3

1

1

1

4

1

1

1

1

1

4

1

1

1

1

1

1

2

1

9

1

1

1

9

1

1

1

1

2

1

9

8

1

8

2

1

77

78

79

80

71

72

73

74

75

76

81

82

83

84

85

65

66

67

68

69

70

59

60

61

62

63

64

55

56

57

58

51

52

53

54

86

87

88

89

90

91

92

93

94

95

96

97

98

99

100

Figure 6-1

Index No.

TM 11-6625-2851-14&P

5000-3021

2190-0094

0520-0024

0370-0141

0370-0041

1410-0033

0370-0050

2410-0001

2140-0224

0400-0084

0370-0090

0370-0077

1490-0030

5060-0767

5060-0752

00741-01209

04800-01013

2420-0001

04800-61020

186A-55B

186A-55B1

5000-0051

2190-0048

2510-0123

5060-0766

5060-0763

5000-0737

2200-0165

2510-0101

2190-0087

1460-0090

5000-0736

5060-0732

5060-2693

2200-0107

2200-0139

04800-01005

2360-0201

04800-01018

04800-01015

04800-01004

04800-01003

1250-0140

2950-0006

2190-0027

04800-01008

1251-1189

Stock No.


Description

Dial-FREQUENCY.......................................................................................

Lockwasher helical medium PH BRZ No. 2 .................................................

Screw-machine 2-56 x 3/16 BH SD SS ........................................................

Knob-assembly tuning .................................................................................

Knob-crank P/O 54 ......................................................................................

Bushing-knob P/O 54...................................................................................

Knob-round 3/8 D BLK P/O 54 .....................................................................

Screw-machine 6-32 x 5/8 OH PD SS P/O 54 ..............................................

Lamp-glow 115 V T-2 bulb wire terminals P/O 43 ........................................

Bushing-snap 1/4 ID BLK NYLON................................................................

Knob-skirted bar 5/8 D BLK W/2 ARROWS .................................................

Knob-skirted bar 5/8 D BLK W/ARROW.......................................................

Stand-tilt......................................................................................................

Foot assembly .............................................................................................

Cover-bottom ..............................................................................................

Bracket-meter retaining................................................................................

M1 see Table 6-1

M2 see Table 6-1

Guide-Plug-in ..............................................................................................

Nut-hex 6-32 5/16 AF 7/64 THK STL W/LOCK .............................................

Switch assembly Z MAGNITUDE .................................................................

Shield-cover ................................................................................................

Clamp-shield ...............................................................................................

Plate-fluted aluminum..................................................................................

Lockwasher EXT PH BRZ NP No. 8 countersunk ........................................

Screw-machine 8-32 x 1/2 FH POZI SS .......................................................

Retainer-handle assembly ...........................................................................

Handle assembly-side..................................................................................

Cover-cabinet front side...............................................................................

Screw-machine 4-40 x 1/4 FH POZI SS .......................................................


Lockwasher helical medium SS No. 8 .........................................................

Spring-torsion P/O 78 ..................................................................................

Cover-cabinet rear side................................................................................

Frame-side (on this assembly are 0590-0052 nut, .......................................

sheet qty 8)

Board-extender 15 pin (supplied accessory) .................................................

Screw-machine 4-40 x 3/8 PH POZI SS W/LOCK ........................................


Shelf-oscillator.............................................................................................


Plate-side ....................................................................................................

Shield ..........................................................................................................

Deleted

Shield-channel.............................................................................................

Connector-shelf ...........................................................................................

Body-RF connector BNC bulkhead mtg........................................................

Nut-hex 1/4-32 3/8 AF 3/32 THK BRS NP ....................................................

Lockwasher INT PH BRZ NP for 1/4 stud .....................................................

Panel-rear ...................................................................................................

Connector-female banana type ....................................................................

6-17

Qty.

1

1

1

4

1

2

1

2

1

1

1

1

2

1

1

2

3

2

1

1

2

1

2

1

1

1

4

1

1

2

4

4

2

2

2

2

8

2

2

1

2

12

12

1

1

1

4

TM 11-6625-2851-14&P

Figure 6-1

Index No.

146

147

148

149

150

151

152

153

120

140

141

142

143

144

145

114

115

116

117

118

119

108

109

110

111

112

113

101

102

103

104

105

106

107

Stock No.

1251-0013

13525A

1250-0076

1250-0216

---------

2190-0084

2950-0006

0370-0125

1250-0001

2190-0016

2950-0001

1400-0029

1400-0084

1400-0090

2190-0037

2950-0038

1251-0184

3101-0033

9100-0405

00610A

1510-0029

04800-21002

0340-0718,

04800-21008

04800-01011

---------

04800-01012

2200-0141

2740-0001

2190-0012

3050-0257

0340-0719

04801-00001


Description

Connector-male banana type .......................................................................

Resistor calibration ......................................................................................

Connector-RF BNC adapter RT angle ..........................................................

Connector-RF BNC adapter plug to plug straight..........................................

R8 see Table 6-1

Lockwasher INT STL CP 1/4 stud ................................................................


Knob-round 1/2 D BLK 1/8 SHFT .................................................................

Connector-RF BNC bulkhead MTG jack .......................................................

Lockwasher INT PH BRZ NP for 3/8 stud .....................................................


Cap-extractor fuse post P/O 114 ..................................................................

F1 see Table 6-1

Holder-fuse extractor post type for 3AG .......................................................

Washer-neoprene 5/8 OD 1/2 ID 1/32 THK P/O 114 ....................................

Lockwasher INT STL CP for 1/2 stud P/O 114 .............................................

Nut-hex 1/2-24 11/16 AF 1/8 THK STL CP P/O 114 .....................................

Connector-AC power 3 pin receptacle ..........................................................

Switch-slide DPDT marked 115/230.............................................................

Transformer-power ......................................................................................

Shield-terminal(supplied accessory).............................................................

Nut-binding post red W/O insert...................................................................

Post-binding ................................................................................................

Insulator-binding post ..................................................................................

Screw-captive ..............................................................................................

Panel-4801A Plug-in....................................................................................

Printed circuit board assembly see Table 6-2 ...............................................

Frame Plug-in..............................................................................................


Nut-hex 10-32 5/16 AF 7/64 THK SS............................................................

Lockwasher EXT PH BRZ NP No. 10 ..........................................................

Washer-flat 7/16 OD BRS NP No. 10 screw................................................

Insulator-binding post ..................................................................................

shield, for reed relay K1.

Qty.

4

2

1

1

2

2

2

2

2

1

1

2

2

2

1

1

1

1

1

1

3

3

1

4

3

4

4

2

1

2

1

6-18

7-0

TM 11-6625-2851-14&P

TM 11-6625-2851-14&P

7-1.

INTRODUCTION

SECTION VII

CIRCUIT DIAGRAMS

7-5.

WAVEFORMS AND VOLTAGE

MEASUREMENTS

7-2.

This section contains schematic diagrams for the

Model 4800A and Model 4801A. Wiring diagrams are not included, although wire colors are given on the

schematics where practical. Refer to Table 7-1 for

7-6.

Voltage measurements and meaningful waveforms are provided with the schematic diagrams as aids to troubleshooting. Measurements should not be considered as performance specifications since they can general notes and an explanation of symbols used in the diagrams. Each schematic diagram contains a table which lists all the reference designators that appear on that diagram.

7-3.

ASSEMBLY AND COMPONENT

IDENTIFICATION

vary with component tolerances and temperature.

Waveforms in all circuits are sinusoidal except in the phase detection circuits. Unless otherwise indicated, measurements were taken with the 13525A Calibration

Resistor on the measurement terminals, the test frequency at 1.59 kHz, and the IMPEDANCE

MAGNITUDE switch set to X100.

7-4.

The functional block diagram in Figure 7-1 includes top and bottom photographs of the instrument to be used as an aid to identifying assemblies, calibration adjustments, and chassis components. Each printed circuit assembly and its components are illustrated with the schematic of the particular assembly.

In addition, each illustration shows the etched wiring on

BOTH sides of the circuit board as aid to selecting suitable test points when troubleshooting.

7-7.

TALKING SCHEMATICS

7-8.

Detailed information on the operation of each circuit in this section will be found on the page facing each schematic. The information is placed in blocks of text placed directly over a circuit schematic. In this form they allow the reader to follow the descriptions and to refer to the circuitry as easily as possible. Questions on the operation of a circuit can then be answered quickly.

7-1

7-2

TM 11-6625-2851-14&P

TM 11-6625-2851-14&P

8-1.

Scope

PART NUMBER-NATIONAL STOCK NUMBER CROSS REFERENCE INDEX

a valid national stock number, order through the normal

The index in this section of the technical manual is to be requisitioning channels. Should you need a part which sed when requisitioning parts from the commercial arts list in Section VI of this manual.

is not listed with a national stock number, you may order by the exception supply ordering procedures using the

FSCM 28480 followed by the manufacturer's part

8-2.

How to Order

SECTION VIII

Wherever the commercial part number appears to have number from Section VI.

8-1

PART

NUMBER

0121-0060

0121-0105

0140-0191

0140-0192

0140-0195

0140-0200

0140-0202

0140-0203

0140-0234

0150-0093

0150-0119

0160-0157

0160-0174

0160-0207

0160-0335

0160-0938

0160-0987

0160-2198

0170-0019

0180-0137

0180-0139

0180-0141

0180-0158

0180-0228

0180-0374

0180-1702

0340-0140

0370-0041

0370-0050

0370-0077

FSCM

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

PART NUMBER-NATIONAL STOCK NUMBER

CROSS REFERENCE INDEX

NATIONAL

STOCK

NUMBER

5910-00-767-4977

5910-00-761-1216

5910-00-615-7474

5910-00-914-4730

5910-00-776-8913

5910-00-914-4732

5910-00-852-2655

5910-00-933-7538

5910-00-494-5056

5910-00-542-2010

5910-00-961-4204

5910-00-961-9591

5910-00-234-9817

5910-00-057-8094

5910-00-411-3606

5910-00-138-1320

5910-00-841-7018

5910-00-430-5647

5910-00-892-7784

5910-00-915-1393

5910-00-007-3988

5910-00-879-0123

5910-00-775-9093

5910-00-719-9907

5910-00-931-7050

5910-00-430-5999

5970-00-088-5074

5355-00-896-9949

5355-00-579-2318

5355-00-767-9444

PART

NUMBER

0370-0141

0490-0393

0490-0399

0683-1005

0683-1015

0683-1035

0683-1205

0683-2015

0683-2025

0683-3005

0683-3355

0683-3915

0683-4755

0683-5115

0698-0083

0698-3113

0698-3153

0698-3403

0698-3498

0698-3558

0698-4014

0698-4121

0698-4123

0698-4484

0757-0200

0757-0273

0757-0274

0757-0280

0757-0288

0757-0401

FSCM

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

8-2

TM 11-6625-2851-14&P

NATIONAL

STOCK

NUMBER

5355-00-520-1732

5945-00-454-7393

5945-00-477-9296

5905-00-960-0099

5905-00-102-5294

5905-00-998-1929

5905-00-497-5610

5905-00-683-2239

5905-00-686-3370

5905-00-402-4248

5905-00-402-4264

5905-00-931-1062

5905-00-498-6062

5905-00-801-8272

5905-00-407-0052

5905-00-420-7127

5905-00-974-6081

5905-00-469-2957

5905-00-478-2244

5905-00-407-0061

5905-00-138-5053

5905-00-998-1916

5905-00-998-1915

5905-00-140-5675

5905-00-891-4224

5905-00-193-4294

5905-00-858-9105

5905-00-853-8190

5905-00-193-4318

5905-00-981-7529

PART

NUMBER

0757-0408

0757-0411

0757-0416

0757-0419

0757-0427

0757-0431

0757-0434

0757-0435

0757-0436

0757-0437

0757-0439

0757-0440

0757-0442

0757-0446

0757-0447

0757-0449

0757-0465

0757-0827

0758-0013

0758-0026

1200-0168

1205-0033

1250-0001

1250-0051

1250-0076

1250-0140

1250-0216

1251-0013

1251-0135

1251-0148

FSCM

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480



NATIONAL

STOCK

NUMBER

5905-00-781-2980

5905-00-056-0451

5905-00-998-1795

5905-00-891-4213

5905-00-917-0578

5905-00-493-0749

5905-00-998-1793

5905-00-858-9148

5905-00-858-6792

5905-00-904-4404

5905-00-990-0303

5905-00-858-6795

5905-00-998-1792

5905-00-858-8895

5905-00-981-7530

5905-00-891-2809

5905-00-904-4412

5905-00-930-7958

5905-00-978-5045

5905-00-978-5050

5935-00-124-5081

5999-00-871-9538

5935-00-027-6759

5999-00-882-6993

5935-00-081-8799

5935-00-966-4457

5935-00-982-7620

5935-00-909-2687

5935-00-972-9464

5935-00-058-9423

PART

NUMBER

1251-0194

1400-0084

1400-0090

1410-0033

1490-0030

1853-0009

1853-0016

1853-0036

1854-0072

1854-0215

1855-0062

1901-0028

1901-0040

1902-0018

1902-0049

1902-0071

1910-0016

1910-0022

2100-0789

2100-1755

2100-1757

2100-1758

2100-1773

2100-2290

2190-0006

2200-0103

2200-0107

2200-0139

2200-0141

2260-0002

FSCM

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

8-3

TM 11-6625-2851-14&P

NATIONAL

STOCK

NUMBER

5935-00-948-9078

5920-00-881-4636

5970-01-005-2884

6625-00-818-5973

6625-00-760-9521

5961-00-955-7708

5961-00-901-4862

5961-00-931-0372

5961-00-761-9379

5961-00-892-8706

5961-00-222-6451

5961-00-951-1505

5961-00-965-5917

5961-00-931-7021

5961-00-911-9277

5961-00-835-9974

5961-00-954-9182

5961-00-690-9341

5905-00-982-8423

5905-00-407-0078

5905-00-407-0079

5905-00-228-5989

5905-00-115-7158

5905-00-451-2537

5310-00-801-6079

5305-00-492-8796

5305-00-094-4541

5305-00-574-0351

5305-00-587-7645

5310-00-997-3078

PART

NUMBER

2360-0197

2360-0201

2420-0001

2950-0001

3101-0033

3101-0045

3101-0100

5000-0051

5060-0049

5060-0732

5060-0763

5060-0766

5060-0767

8120-0078

9100-1618

9140-0107

9140-0179

9140-0237

FSCM

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480



NATIONAL

STOCK

NUMBER

5305-00-587-7626

5305-00-598-6650

5310-00-687-7337

5310-00-450-3324

5930-00-977-1760

5930-00-402-6752

5930-00-918-4381

6625-00-412-1204

6625-00-850-2241

6625-00-155-5798

5865-00-934-1344

6625-00-818-4575

6625-00-903-0348

5995-00-995-9822

5950-00-431-3196

5950-00-865-9044

5950-00-225-2177

5950-00-431-3216

PART

NUMBER FSCM

8-4

TM 11-6625-2851-14&P

NATIONAL

STOCK

NUMBER

TM 11-6625-2851-14&P

APPENDIX A

REFERENCES

DA PAM 310-4 Index of Technical Publications: Technical Manuals, Technical Bulletins, Supply Manuals

(Types 7, 8, and 9), Supply Bulletins, Modification Work Orders and Lubrication Orders.

TM 38-750

TM 750-244-2

The Army Maintenance Management System (TAMMS).

Procedures for Destruction of Electronics Materiel to Prevent Enemy Use (Electronics

Command).

A-1

TM 11-6625-2851-14&P

APPENDIX B

MAINTENANCE ALLOCATION

B-1. General.

Section I. INTRODUCTION

j. Overhaul. That maintenance effort

This appendix provides a summary of the maintenance (service/action) necessary to restore an item to a operation for ZM-74/U. It authorizes categories of completely serviceable/operational condition as prescribed by maintenance standards (i.e., DMWR) in maintenance for specific maintenance functions on repairable items and components and the tools and equipment required to perform each function. This appropriate technical publications. Overhaul is normally the highest degree of maintenance performed by the appendix may be used as an aid in planning maintenance operations.

Army. Overhaul does not normally return an item to like

B-2. Maintenance Function.

Maintenance functions will be limited to and defined as new condition.

k. Rebuild. Consists of those services/actions necessary for the restoration of unserviceable follows: a. Inspect. To determine the serviceability of an equipment to a like new condition in accordance with original manufacturing standards. Rebuild is the highest degree of materiel maintenance applied to Army item by comparing its physical, mechanical, and/or electrical characteristics with established standards through examination.

b. Test. To verify serviceability and to detect equipment. The rebuild operation includes the act of returning to zero those age measurements (hours, miles, etc.) considered in classifying Army equipment/components.

incipient failure by measuring the mechanical or electrical characteristics of a item and comparing those characteristics with prescribed standards.

c. Service. Operations required periodically to

B-3. Column Entries.

a. Column 1, Group Number. Column 1 lists group numbers, the purpose of which is to identify keep an item in proper operating condition, i.e., to clean

(decontaminate), to preserve, to drain, to paint, or to replenish fuel, lubricants, hydraulic fluids, or compressed air supplies.

d. Adjust. To maintain, within prescribed limits, by bringing into proper or exact position, or by setting components, assemblies, subassemblies, and modules with the next highest assembly.

b. Column 2, Component/Assembly. Column 2 contains the noun names of components, assemblies, subassemblies, and modules for which maintenance is authorized.

c. Column 3, Maintenance Functions. Column 3 lists the functions to be performed on the item listed in the operating characteristics to the specified parameters.

e. Align. To adjust specified variable elements of an item to bring about optimum or desired performance.

f. Calibrate. To determine and cause corrections column 2. When items are listed without maintenance functions, it is solely for purpose of having the group numbers in the MAC anl RPSTL coincide.

d. Column 4, Maintenance Category. Column 4 to be made or to be adjusted on instruments or test measuring and diagnostic equipments used in precision measurement. Consists of comparisons of two specifies, by the listing of a "work time" figure in the appropriate subcolumn(s), the lowest level of instruments, one of which is a certified standard of known accuracy, to detect and adjust any discrepancy in the accuracy of the instrument being compared.

g. Install. The act of emplacing, seating, or fixing maintenance authorized to perform the function listed in column 3. This figure represents the active time required to perform that maintenance function at the indicated category of maintenance. If the number or into position an item, part, module (component or assembly) in a manner to allow the proper functioning of complexity of the tasks within the listed maintenance function vary at different maintenance categories, appropriate "work time' figures will be shown for each the equipment or system.

h. Replace. The act of substituting a serviceable like type part, subassembly, or module (component or assembly) for an unserviceable counterpart.

i. Repair. The application of maintenance services (inspect, test, service, adjust, align, calibrate, replace) or other maintenance actions (welding, grinding, riveting, straightening, facing, remachining, or category. The number of task-hours specified by the

'work time" figure represents the average time required to restore an item (assembly, subassembly, component, module, end item or system) to a serviceable condition under typical field operating conditions. This time includes preparation time, troubleshooting time, and quality assurance/quality control time in addition to the time required to perform the specific tasks identified for the maintenance functions authorized resurfacing) to restore serviceability to an item by correcting specific damage, fault, malfunction, or failure in a part, subassembly, module (component or assembly), end item, or system.

B-1

in the maintenance allocation chart. Subcolumns of column 4 are as follows:

C - Operator/Crew

0 - Organizational

F - Direct Support

H - General Support

D - Depot e. Column 5, Tools and Equipment. Column 5 specifies by code, those common tool sets (not individual tools) and special tools, test, and support equipment required to perform the designated function.

f. Column 6, Remarks. Column 6 contains an alphabetic code which leads to the remark in section IV,

Remarks, which is pertinent to the item opposite the particular code.

B-4. Tool and Test Equipment Requirements

(Sect. III).

a. Tool or Test Equipment Reference Code. The numbers in this column coincide with the numbers used in the tools and equipment column of the MAC. The numbers indicate the applicable tool or test equipment for the maintenance functions.

B-2

TM 11-6625-2851-14&P

b. Maintenance Category. The codes in this column indicate the maintenance category allocated the tool or test equipment.

c. Nomenclature. This column lists the noun name and nomenclature of the tools and test equipment required to perform the maintenance functions.

d. National/NATO Stock Number. This column lists the National/NATO stock number of the specific tool or test equipment.

e. Tool Number. This column lists the manufacturer's part number of the tool followed by the Federal Supply

Code for manufacturers (5-digit) in parentheses.

B-5. Remarks (Sect. IV).

a. Reference Code. This code refers to the appropriate item in section II, column 6.

b. Remarks. This column provides the required explanatory information necessary to clarify items appearing in section II.

(1)

GROUP

NUMBER

00

01

02

03

04

05

06

07

08

09

10

11

12

TM 11-6625-2851-14&P

(2)

SCHMITT TRIGGER A7

PHASE DETECTOR A8

DC AMPLIFIER A14

ANALOG BOARD A15

OSCILLATOR A16

20V REGULATOR A18

SECTION II MAINTENANCE ALLOCATION CHART

FOR

IMPEDANCE METER: VECTOR, ZM-74/U

(3) (4)

COMPONENT ASSEMBLY

BRIDGE CAPACITANCE: ZM-74/U

UTILITY AMPLIFIER (5 identical: Al, A2,

A4, A9, A11)

BANDPASS FILTER (2 identical: A3, A10)

DETECTOR (2 identical: AS, A12)

FILTER AMPLIFIER (2 identical: A6, A13)

AGC AND MONITOR AMPLIFIER A17

RECTIFIER AND 14V REGULATORS A19

MAINTENANCE

FUNCTION

Inspect

Service

Test

Adjust

Repair

Repair

Overhaul

Test

Replace

Repair

Overhaul

Test

Replace

Repair

Overhaul

Test

Replace

Repair

Overhaul

Test

Replace

Repair

Overhaul

Test

Replace

Repair

Overhaul

Test

Replace

Repair

Overhaul

Test

Replace

Repair

Overhaul

Test

Replace

Repair

Overhaul

Test

Replace

Repair

Overhaul

Test

Replace

Repair

Overhaul

Test

Replace

Repair

Overhaul

Test

Replace

Repair

Overhaul

(5) (6)

MAINTENANCE CATEGORY

C O F H D

0.1

0.2

0.8

0.5

0.5

0.3

0.3

0.3

0.3

0.3

0.3

0.3

0.3

0.3

0.3

0.3

0.3

0.3

0.3

0.3

0.3

0.3

0.3

TOOLS AND

EQUIPMENT REMARKS

Visual

None

1 thru 7

2 thru 7

7

1.0

7

1.5

7

1 thru 7

7

0.2

7

0.3

7

1 thru 7

7

0.2

7

0.3

7

1 thru 7

7

0.2

7

0.3

7

1 thru 7

7

0.2

7

0.3

7

1 thru 7

7

0.2

7

0.3

7

1 thru 7

7

0.2

7

0.3

7

0.2

7

0.3

7

1 thru 7

7

0.2

7

0.3

7

1 thru 7

7

0.2

7

0.3

7

1 thru 7

7

0.3

0.3

0.2

0.3

0.3

0.3

0.2

0.3

0.3

0.3

0.2

0.3

B-3

(1)

GROUP

NUMBER

13

14

15

16

TM 11-6625-2851-14&P

(2)

COMPONENT ASSEMBLY

MAGNITUDE SWITCH A20

OSCILLATOR SWITCH A21

VARIABLE CAPACITOR A22

SECTION II MAINTENANCE ALLOCATION CHART

FOR


(3) (4)

DIRECT MEASUREMENT PLUG-IN

A23 4801A

MAINTENANCE

FUNCTION

Test

Replace

Repair

Overhaul

Test

Replace

Repair

Overhaul

Test

Replace

Repair

Overhaul

Test

Replace

Repair

Overhaul

(5) (6)

MAINTENANCE CATEGORY

C O F H D

0.3

0.3

0.2

0.3

0.2

0.3

0.1

0.2

0.2

0.5

0.3

0.3

TOOLS AND

EQUIPMENT REMARKS

0.2

0.3

0.2

7

0.3

7

1 thru 7

7

B-4

SECTION III. TOOL AND TEST EQUIPMENT REQUIREMENTS FOR


(1)

TOOL OR TEST

(2)

EQUIPMENT MAINTENANCE

REF CODE LEVEL

3

4

I

2

5

6

7

H, D

H, D

H, D

H, D

H, D

H, D

H, D

(3) (4)

NOMENCLATURE

NATIONAL/NATO

STOCK NUMBER

OSCILLOSCOPE AN/USM-281C

VOLTMETER, DIGITAL AN/GSM-64B

COUNTER, ELECTRONIC AN/USM-459

VOLTMETER, ELECTRONIC ME-459

6625-00-106-9622

6625-00-022-7894

6625-01-061-8928

6625-00-229-0457

MULTIMETER AN/USM-223

TRANSFORMER, VARIABLE POWER

6625-00-999-7465

5950-00-235-2086

CN-16/U

Common tools necessary to the performance of this maintenance function are available to maintenance personnel for the maintenance category listed.

TM 11-6625-2851-14&P

(5)

TOOL

NUMBER

*U.S. GOVERNMENT PRINTING OFFICE: 1981-703029/1255

B-5

By Order of the Secretary of the Army:

Official:

ROBERT M. JOYCE

Brigadier General, United States Army

The Adjutant General

DISTRIBUTION:

To be distributed in accordance with Special List.

TM 11-6625-2851-14&P

E. C. MEYER

General, United States Army

Chief of Staff

Figure 6-1. 4800A VECTOR IMPEDANCE METER

6-19

TM 11-6625-2851-14&P

Figure 7-1. FUNCTIONAL BLOCK DIAGRAM

7-3

TM 11-6625-2851-14&P

Figure 7-1. FUNCTIONAL BLOCK PROGRAM

7-4

TM 11-6625-2851-14&P

Figure 7-2. OSCILLATOR-AGC AMPLIFIER

7-5

TM 11-6625-2851-14&P

Figure 7-2. OSCILLATOR-AGC AMPLIFIER

7-6

TM 11-6625-2851-14&P

Figure 7-3. Z RANGE SWITCHING & 4801A DIRECT MEASUREMENT PLUG-IN

7-7

TM 11-6625-2851-14&P

Figure 7-3. Z RANGE SWITCHING & 4801A DIRECT MEASUREMENT PLUG IN

7-8

TM 11-6625-2851-14&P

Figure 7-4. VOLTAGE CHANNEL AMPLIFIERS

7-9

TM 11-6625-2851-14&P

Figure 7-4. VOLTAGE CHANNEL AMPLIFIERS

7-10

TM 11-6625-2851-14&P

Figure 7-5. CURRENT CHANNEL AMPLIFIERS

7-11

TM 11-6625-2851-14&P

Figure 7-5. CURRENT CHANNEL AMPLIFIERS

7-12

TM 11-6625-2851-14&P

Figure 7-6. DETECTORS AND DC AMPLIFIER

7-13

TM 11-6625-2851-14&P

Figure 7-8. DETECTORS AND DC AMPLIFIER

7-14

TM 11-6625-2851-14&P

Figure 7-7. PHASE MEASUREMENT CIRCUITS

7-15

TM 11-6625-2851-14&P

Figure 7-7. PHASE MEASUREMENT CIRCUITS

7-16

TM 11-6625-2851-14&P

Figure 7-8. POWER SUPPLIES

7-17

TM 11-6625-2851-14&P

Figure 7-8. POWER SUPPLIES

7-17

7-18

TM 11-6625-2851-14&P

Figure 7-9. ANALOG OUTPUTS

7-19

TM 11-6625-2851-14&P

PIN 049512-000

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Chicago Machinery Movers

HEWLETT-PACKARD ZM-74 Vector, 4800A Impedance Meter, 4801 Plug-in TECHNICAL MANUAL

Assistant Bot

TECHNICAL MANUAL

OPERATOR'S, ORGANIZATIONAL, DIRECT SUPPORT AND

GENERAL SUPPORT MAINTENANCE MANUAL

INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS

FOR

IMPEDANCE METER: VECTOR ZM-74/U

(HEWLETT-PACKARD MODEL 4800A WITH MODEL 4801

PLUG-IN) (NSN 6625-00-167-9861)

HEADQUARTERS, DEPARTMENT OF THE ARMY

2 SEPTEMBER 1981

TM 11-6625-2851-14&P

WARNING

TM 11-6625-2851-14&P

OPERATOR'S, ORGANIZATIONAL, DIRECT SUPPORT AND

GENERAL SUPPORT MAINTENANCE MANUAL

INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS

FOR

IMPEDANCE METER: VECTOR ZM-74/U

(HEWLETT-PACKARD MODEL HP-4800A WITH MODEL 4801 PLUG-IN)

(NSN 6625-00-167-9861)

REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS

You can help improve this manual. If you find any mistakes or if you know of a way to improve the procedures, please let us know. Mail your letter, DA Form

2028 (Recommended Changes to Publications and Blank Forms), or DA 2028-2 located in back of this manual direct to: Commander, US Army Communications

and Electronics Materiel Readiness Command, ATTN: DRSEL- ME-MQ, Fort

Monmouth, NJ 07703.

In either case, a reply will be furnished direct to you.

Table of Contents

i

Section

GENERAL INFORMATION

INSTALLATION

TM 11-6625-2851-14&P

Page

ii

TM 11-6625-2851-14&P

iii

TM 11-6625-2851-14&P

0-1.

Scope

Section 0. INTRODUCTION

0-2.

0-3.

Indexes of Publications

Maintenance Forms, Records and

0-6.

Destruction of Army Electronics

Reports

Materiel

0-5.

Administrative Storage

0-7.

Warranty Information

0-4.

Reporting Equipment Improvement

Recommendations (EIR)

0-1

TM 11-6625-2851-14&P

1-0

1-1.

DESCRIPTION

TM 11-6625-2851-14&P

SECTION I

GENERAL INFORMATION

1-6.

ACCESSORIES FURNISHED

1-8.

INSTRUMENT IDENTIFICATION

1-1

TM 11-6625-2851-14&P

1-2

TM 11-6625-3851-14&P

2-1.

INITIAL INSPECTION

2-2.

MECHANICAL CHECK. If damage to the

2-3.

PERFORMANCE CHECK. The electrical

SECTION II.