HP 5305B Service manual

O P E R A T I N G A N D S E R V I C E M A N U A L

1300 MHz COUNTER

5305 B

CERTIFICATION

t

Hewlett-Packard Company certifies that this instrument met its published specifications a
the time of shipment from the factory. Hewlett-Packard Company further certifies that its
calibration measurements are traceable to the United States National Bureau of Standards,
to the extent allowed by the Bureau's calibration facility, and to the calibration facilities of
other International Standards Organization members

.

WARRANTY AND ASSISTANCE

This Hewlett-Packard product is warranted against defects in materials and workmanship for
a period of one year from the date of shipment. Hewlett-Packard will, at its option, repair or
replace products which prove to be defective during the warranty period provided they are
returned to Hewlett-Packard, and provided the preventive maintenance procedures in this
manual are followed. Repairs necessitated by misuse of the product are not covered by this
warranty. NO OTHER WARRANTIES ARE EXPRESSED OR IMPLIED, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE. HEWLETT-PACKARD IS NOT LIABLE FOR CONSEQUENTIAL
DAMAGES.

Service contracts or customer assistance agreements are available for Hewlett-Packard
products.

For any assistance, contact your nearest Hewlett-Packard Sales and Service Office.
Addresses are provided at the back of this manual.

SECTION I XE

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1300 MHz COUNTER

5305 B

OPERATING AND SERVICE MANUAL

Model 5305B

Table of Contents

SERIAL PREFIX: 1616A

This section applies directly to Model 5305B 1300 MHz
Counters having Serial Prefix 1616A. This section is
provided in loose-leaf form for incorporation into the 5300
Measurement System Manual. 5305A instruments are
documented in a separate manual.

NEWER INSTRUMENTS

This section with enclosed "Manual Changes" sheet
applies directly to HP Model 5305B 1300 MHz Counters
havin

Serial Prefix numbers above 1616A.

OLDER INSTRUMENTS

Subsection VII of this document contains information

ertinent to all older instruments.

Copyright HEWLETT-PACKARD COMPANY 1976

5301 STEVENS CREEK BLVD., SANTA CLARA, CALIF. 95050

Printed: AUG 1976

MANUAL PART NO. 05305-90008
MICROFICHE PART NO. 05305-90009

PRINTED IN U.S.A.

TABLE OF CONTENTS

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Model 5305B

Table of Contents

Section

I X E 5305B 1300 MHz Counter

Subsection

I GENERAL INFORMATION ...................................................................................... 9E-1-1

9E-1-1. Scope of Manual.................................................................................... 9E-1-1

9E-1-3. Description ............................................................................................9E-1-1

9E-1-6. Instrument Identification ....................................................................... 9E-1-2

9E-1-8. Equipment Supplied .............................................................................. 9E-1-2

9E-1-10. Accessories Available ........................................................................... 9E-1-2

9E-1-12. 5300A/5300B Compatibility. ... ............................................................9E-1-2

9E-1-14. Specifications ........................................................................................9E-1-2

9E-1-16. Recommended Test Equipment............................................................. 9E-1-2

II INSTALLATION......................................................................................................... 9E-2-1

9E-2-1. Unpacking and Inspection ..................................................................... 9E-2-1

9E-2-3. Storage and Shipment............................................................................ 9E-2-1

9E-2-6. Installation and Removal of Plug-On .................................................... 9E-2-1

9E-2-8. Portable Operation................................................................................. 9E-2-1

III OPERATION

9E-3-1

9E-3-1. Introduction ........................................................................................... 9E-3-1

9E-3-3. Operating Characteristics ...................................................................... 9E-3-1

9E-3-5. Input Channels.................................................................................... 9E-3-1

9E-3-9. Resolution.............................................................................................. 9E-3-1

9E-3-11. 1300 MHz Channel Input Levels........................................................ 9E-3-2

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IV THEORY OF OPERATION........................................................................................ 9E-4-1

9E-4-1. Introduction ........................................................................................... 9E-4-1

9E-4-3. A1 LogicBoard...................................................................................... 9E-4-1

9E-4-5. High Impedance Amplifier................................................................. 9E-4-1

9E-4-12. Counting Circuits................................................................................ 9E-4-1

9E-4-16. Frequency Multiplier .......................................................................... 9E-4-2

9E-4-30. 1300 MHz ÷ Circuit............................................................................ 9E-4-4

9E-4-32. A2 1300 MHz Amplifier Assembly……………………………………9E-4-4

V MAINTENANCE......................................................................................................... 9E-5-1

9E-5-1. Introduction ........................................................................................... 9E-5-1

9E-5-3. Recommended Test Equipment............................................................. 9E-5-1

9E-5-5. In-Cabinet Performance Check .............................................................9E-5-1

9E-5-7. Instrument Access ................................................................................. 9E-5-1

9E-5-9. Periodic Maintenance ............................................................................ 9E-5-1

9E-5-11. Maintenance and Repair........................................................................ 9E-5-1

9E-5-15. Adjustments........................................................................................... 9E-5-5

9E-5-17. Channel A Adjustments......................................................................... 9E-5-5

9E-5-19. Channel B Adjustments......................................................................... 9E-5-6

9E-5-21. Troubleshooting..................................................................................... 9E-5-6

9E-5-25. 100 MHz Channel Troubleshooting ...................................................... 9E-5-6

9E-5-27. 1300 MHz Channel Troubleshooting .................................................... 9E-5-7

9E-5-29. Both Channels Inoperative…………………………………………...9E-5-7

9E-5-34. Frequency Multiplier .......................................................................... 9E-5-7

VI REPLACEABLE PARTS ............................................................................................9E-6-1

9E-6-1. Introduction ........................................................................................... 9E-6-1

9E-6-3. Orderin

Information............................................................................. 9E-6-1

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Model 5305B

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Table of Contents
List of Tables and Fi

Subsection Page

VII MANUAL CHANGES .…….....................................................................................9E-7-1

VIII CIRCUIT DIAGRAMS..............................................................................................9E-8-1

Table Page

9E-1-1. Specifications .............................................................................................................9E-1-3

9E-1-2. Recommended Test Equipment..................................................................................9E-1-4

9E-3-1. Resolution vs GateTime .............................................................................................9E-3-1

9E-5-1. In-Cabinet Performance Check ..................................................................................9E-5-3

9E-5-2. Erroneous Displays Caused by U4 .............................................................................9E-5-7

ures

TABLE OF CONTENTS (Cont'd)

9E-7-1. ManualChanges ...................................................................................9E-7-1

9E-7-3. NewerInstruments................................................................................9E-7-1

9E-8-1. Introduction..........................................................................................9E-8-1

LIST OF TABLES

9E-6-1. Replaceable Parts .......................................................................................................9E-6-3

9E-6-2. Manufacturers Code List ............................................................................................9E-6-8

9E-8-1. Counter Signal List.....................................................................................................9E-8-1

LIST OF FIGURES

figure Page

9E-3-1. dBm-to-Voltage Conversions.....................................................................................9E-3-1

9E-3-2. Front Panel Controls, Connectors, and Indicators......................................................9E-3-2

9E-3-3. Self-Check Measurements..........................................................................................9E-3-3

9E-3-4. 100 MHz Channel Frequency Measurements……………………………………….9E-3-4

9E-3-5. 90 MHz-1300 MHz Channel Frequency Measurements ............................................9E-3-5

9E-4-1. Phase Detector Block Diagram...................................................................................9E-4-2

9E-4-2. VCO Waveforms at about 2MHz...............................................................................9E-4-3

9E-4-3. VCO Characteristics...................................................................................................9E-4-4

9E-5-1. Separation Procedure..................................................................................................9E-5-2

9E-5-2. Test Setup for 1300MHz Adjustment.........................................................................9E-5-5

9E-6-1. Details of Input Connector J1 and Fuse Mounting………………………………….9E-6-8

9E-8-1. Channel B and Frequency Multiplier Circuits, Schematic Diagram ..........................9E-8-5

9E-8-2. Channel A and Lo

ic Board Circuits, Schematic Diagram………………………….9E-8-9

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SECTION I XE

5305B 1300 MHz COUNTER

SUBSECTION I

GENERAL INFORMATION

Model 5305B

General Information

9E-1-1. SCOPE OF MANUAL

9E-1-2. This manual provides operating and service
information for the Hewlett-Packard Model 5305B 1300
MHz Counter. Information for the mainframes (5300A
or 5300B) is contained in separate manuals. This
manual is divided into eight sections containing the
following information:

SECTION 1 GENERAL INFORMATION covers a
description of the counter, equipment supplied,
accessories, specifications, and recommended test
equipment.

SECTION II INSTALLATION provides instruc­tions for unpacking, inspection, preparation for use,
shipment, and storage for the counter.

SECTION III OPERATION covers the counter's
operating features including front-panel controls,
input level considerations, and operating and self­check procedures.

SECTION IV THEORY OF OPERATION
describes the counter's theory of operation.

SECTION V MAINTENANCE contains an in­cabinet performance check, adjustments, and
troubleshootin

information.

SECTION VI REPLACEABLE PARTS provides a
complete list of the counter's replaceable parts and
information for ordering parts.

SECTION VII MANUAL CHANGES provides
information necessary to backdate the manual to cover
earlier instruments.

SECTION VIII SCHEMATIC DIAGRAMS THEORY
contains schematic diagrams, and component locators.

9E-1-3. DESCRIPTION

9E-1-4. The 5305B extends the frequency measuring
capability of the 5300 Measuring System to the UHF range.
The counter features burst or CW measurements to 1300 MHz,
separate channels to cover 90 MHz-1300 MHz and 50 Hz to
100 MHz both with 20 mV rms sensitivity, high resolution
mode for fast tone measurements, automatic gain control for
both channels or manual attenuator control for the high
frequency channel, fuse protected high frequency channel,
and probe power plus accessory preamp for high sensitivity
applications. When operating in the high resolution mode, a
phaselocked multiplier gives 1000 times improvement in the
resolution of audio tone measurements. This feature is
especially useful for servicing equipment using tone
modulation for di

ital encoding on the carrier.

9E-1-1

Model 5305B General

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Information

The 5305B is applicable to mobile communication bands
in addition to VHF and UHF TV transmissions plus
TACAN/DME and ATC radar transponders.

9E-1-5. The 10855A Preamplifier is available to boost
the UHF sensitivit

of the counter by a minimum of 22 dB.

9E-1-6. INSTRUMENT IDENTIFICATION

9E-1-7. Hewlett-Packard instruments have a 2-section,
10-character serial number (0000A00000) which is located
on the rear panel. The 4-digit serial prefix identifies
instrument changes. If the serial prefix of your instrument
differs from that listed on the title page of this manual,
there are differences between this manual and your
instrument. Instruments having higher serial prefixes are
covered with a "Manual Changes" sheet included with this
manual. If the change sheet is missing, contact the nearest
Hewlett-Packard Sales and Service Office listed at the
back of this manual. Instruments having a lower serial
prefix than that listed on the title page, are covered in the
backdating Section VII.

9E-1-8. EQUIPMENT SUPPLIED

9E-1-9. The 5305B is supplied with an operating and
service manual.

9E-1-10. ACCESSORIES AVAILABLE

9E-1-11. For high-sensitivity UHF applications, the
10855A Preamplifier can be used with the 5305B. The
10855A covers the 2 MHz to 1.3 GHz range with a gain of
22 dB minimum. Power requirements are +15 volts at ≈ 40
mA. The 5305B has a front-panel connector to supply the
required + 15 volts to 10855A.

9E-1-12. 5300A/5300B COMPATIBILITY

9E-1-13. The 5305B is fully compatible with either the
5300A or the 5300B mainframe. Unlike the 5305A, a high­stability time base is not available for the 5305B, however
a hi

h-stability time base is available for the 5300B.

9E-1-14. SPECIFICATIONS

9E-1-15. Specifications are listed in Table 9E-1-1

.

9E-1-16. RECOMMENDED TEST EQUIPMENT

9E-1-17. Test equipment recommended for testing,
calibration, and repair of the 5305B is listed in Table 1-2.

9E-1-2

Table 9E-1-1. Specifications

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5305B General

INPUT CHANNEL A (CW OR BURST)

Range: 90 MHz to 1300 MHz, prescaled by 16

Sensitivity: 20 mV rms

Impedance: 50Ω

Attenuator: Continuously variable to give optimum

noise suppression for si

nals up to 3.5V rms.

Overload Protection: 5V rms, maximum. Input cir-

cuitry is fuse protected; fuse is located in BNC
connector and is accessible from the front panel.

Operating Dynamic Range: > 47 dB

INPUT CHANNEL B (NORMAL AND HIGH

RESOLUTION MODE)

Range: 50 Hz to 100 MHz, direct count in normal

mode. 50 Hz to 10 kHz in high resolution mode. In
the high resolution mode, the 5305B uses a phase­locked multiplier to increase resolution X1000 over
normal measurement resolution.

Sensitivity: 20 mV rms

Impedance: 1 MΩ shunted by less than 40 pF.

FREQUENCY MEASUREMENT

RESOLUTION (SELECTABLE):

Normal Mode (50 Hz to 1300 MHz): 0.1 Hz to

10000 Hz in decade steps corresponding to gate times
of 10 sec to 0.0001 sec in decade steps on channel B
and to gate times of 160 s to .0016 s in decade steps on
channel A.

High Resolution Mode (50 Hz to 10 kHz): 0.0001,

0.001, 0.01, 0.1, 1, 10 Hz corresponding to 10, 1, 0.1,

0.01, 0.001, 0.0001 second

ate times on channel B.

Accuracy: ±1 digit displayed ± time base accuracy.

Display: Hz, kHz, MHz with positioned decimal point.

GENERAL

Check: Counts internal 10 MHz reference frequency

to check counting circuits.

Operating Temperature: 0° to 50°C.

Power Requirements: Nominally 12 watts including

mainframe.

Weight: Net 1.0 kg (2-1/4 lbs.); Shipping 1.8 kg (4 lbs.)

Overload Protection: 250V rms from 50 Hz to 10

kHz, declining to 10V rms above 10 MHz.

Search Indicator: In high-resolution mode the "S"

annunciator is lit whenever the input is beyond the
proper frequency range, or too weak to measure, or
during the brief acquisition time following signal
interruption.

Automatic Hold: In high-resolution mode, the last

valid reading is held in display when input is
terminated.

Dimensions: With mainframe, 89 mm H (3-1/2")x 160

mm W (6-1/4") x 248 mm L (9-3/4").

Compatible Mainframes: 5300A (6 digits) or 5300B
(8 digits). 5300B is recommended.

Accessories: 10855A Preamp (22 dB gain).

9E-1-3

Model 5305B General
Information

Oscilloscope 50 MHz Bandwidth HP 180A

Vertical Plug-In 50 mV/div Sensitivity HP 1801A

Time Base Plug-In 50 MHz Bandwidth HP 1821A

Sampling Plug-In 1000 MHz HP 1810A

Optical Sampling Plug-In If desired to measure up to 1300 MHz HP 1811A/1432A

Synthesized Signal Generator 1300 MHz HP 8660B/86602A

Power Meter -30 dBm to + 10 dBm HP 435A

Power Sensor 90 MHz to 1300 MHz HP 8481A

Test Oscillator 50 Hz to 10 MHz 3V rms HP 651B

Mainframe HP 5300B

Table 9E-1-2. Recommended Test Equipment

Instrument Required Characteristics Recommended Type

Digital Voltmeter -5V to +20 V dc HP 5306A

Power Splitter 50 ohms 90 MHz to 1300 MHz HP 11667A

Scope Probe 10:1 1 MegΩ HP 10004D

9E-1-4

SECTION IX E

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5305B 1300 MHz COUNTER

SUBSECTION II

INSTALLATION

Model 5305B

Installation

9E-2-1. UNPACKING AND INSPECTION

9E-2-2. If the shipping carton is damaged, ask that the
carrier's agent be present when the instrument is unpacked.
Inspect the instruments for damage, such as scratches,
dents, broken knobs, etc. If the instrument is damaged or
fails to meet performance tests when used with the 5300B
Measuring System, notify the carrier and the nearest
Hewlett-Packard Sales and Service Office immediately.
Performance check procedures are located in Section IX E­5, and Sales and Service Offices are listed in Section VI of
the 5300B portion of the manual. Retain the shipping
carton and the padding material for the carrier's inspection.
The Sales and Service Office will arrange for the repair or
replacement of the instrument without waiting for the
claim a

9E-2-3. STORAGE AND SHIPMENT

9E-2-4. PACKAGING. To protect valuable electronic
equipment during storage and shipment, always use the
best packaging methods available. Your Hewlett­Packard Sales and Service Office can provide packaging
material, such as that used for original factory packaging.
Contract packaging companies in many cities can provide
dependable custom packaging on short notice. Here is one
recommended packa

box with 200 lbs. burst test (HP Part No. 9211-1620). The
instrument is secured and protected, while in the box, by a

ainst the carrier to be settled.

method:

a. The original container is a corrugated cardboard

top and bottom molded frame of polystyrene (HP Part No.
9220-1545). Also included with the instrument is a plastic
dust-protection cover (HP Part No. 9220-1762).

9E-2-5. ENVIRONMENT. Conditions during storage
and shipment should be normall

a. Maximum altitude: 25,000 ft.
b. Minimum temperature: -40°F( -40°C).
c. Maximum temperature: +167°F(+75°C).

9E-2-6. INSTALLATION AND REMOVAL OF
PLUG-ON

9E-2-7. The 5305B 1300 MHz Counter must be used
with a mating 5300A or B Measuring System, before any
measurements can be made. To mate the 5305B 1300 MHz
Counter with a 5300 Measuring System, see Figure 2-1
and Para

9E-2-8 PORTABLE OPERATION.

9E-2-9. The use of the HP Model 5310A Battery Pac
enables the 5300 Measuring System and 5305B 1300 MHz
Counter to be used in areas removed from ac power
sources. The 5310A Battery Pack typically provides 5
hours of portable operating time before recharging. Tables
1-2 and 1-4 in 5300 portion of the manual lists the HP
5310A Battery Pack as an available accessory.
Documentation on the 5310A is also included in Section
IV through VIII of the 5300 portion of the manual. To
prepare the 5300/5305B for portable operation, refer to
Paragraph 2-13 and Figure 2-2 in the 5300 portion of the
manual.

raph 2-11 in the 5300 portion of the manual.

limited as follows:

9E-2-1

Model 5305B

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Operation

SECTION IX E

5305B 1300 MHz COUNTER

SUBSECTION III

OPERATION

9E-3-1. INTRODUCTION

9E-3-2. This section covers operating information for the
5305B including a description of controls, indicators, and
connectors, resolution, input levels, and operating

rocedures for frequency measurements and self check.

9E-3-3. OPERATING CHARACTERISTICS

9E-3-4. The 5305B Counter performs frequency mea­surements by means of two separate input channels. These
channels provide a combination of low frequency
measurements and high-sensitivity, high frequency
measurements. Measurement capability is applicable to all
frequencies in the VHF and mobile communication bands in
addition to a significant portion of the UHF band. The
10855A Preamplifier can be used to boost the UHF inpu
sensitivit

9E-3-5. Input channels

9E-3-6. Two input channels are provided, Channel A - 90
MHz to 1300 MHz and Channel B - 50 Hz to 100 MHz.
Both channels have 20 mV rms sensitivit

9E-3-7. Channel A prescales the input frequency by 16 and
can be used to measure CW or burst signals. Input coupling
is ac. An AGC circuit is included to give a dynamic range
of >47 dB. An internal fuse, located inside the input jack,

rotects circuitry from overloads greater than 5V rms. Note
that a blown fuse may not prevent the counter from
measuring high-frequency inputs. In this instance, the
counter’s circuitry is no longer protected,ie.,as it would be
at lower frequencies by a good open circuit. If the fuse
blows, a replacement fuse is supplied with the instrument.

22 dB.

.

9E-3-8. The frequency range of Channel B depends on the
mode of operation - normal or high resolution. In the
normal mode, Channel B covers 50 Hz to 100 MHz. With
high-resolution selected, Channel B covers 50 Hz to 10
kHz. The high resolution mode uses a phase-locked
multiplier to increase resolution by a factor of 1000. Input
impedance is 1 Megohm shunted by less than 40 pF. A 10
to 1 divider probe can be used to increase the input
impedance to 10 Me

9E-3-9. RESOLUTION

9E-3-10. The 5305B has a RESOLUTION switch which
determines the least-significant digit (LSD) dis
example, with an input of 123,456 Hz, setting the
RESOLUTION switch to 1 kHz places the "3" in the LSD.
Setting the switch to 10 Hz, places the "5" in the LSD.
Resolution can be expressed in terms of the counter's gate
time, as shown in Table 9E-3-1.

Table 9E-3-1. Resolution vs Gate time

RESOLUTION GATE TIME

80 MHz 1100 MHz

.1 Hz 10 s 160 s
1 Hz 1 s 16 s
10 Hz .1 s 1.6 s
100Hz .01s .16s
1 kHz 1 ms 16 ms

10 kHz .1 ms 1.6 ms

ohms.

layed. For

Figure 9E-3-1. dBm-to-Volta g e Co nve rsions

9E-3-1

Model 5305B

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Operation

9E-3-11. 1300 MHz Channel Input Levels

9E-3-12. The 1300 MHz channel is a 50-ohm system with a
maximum input of 5V rms. Figure 9E-3-1 provides a
conversion scale for determinin

respective levels of

Figure 9E-3-2. Front Panel Controls, Connectors, and Indicators

voltage, power, and dBm. This scale applies to a 50-ohm
system and is not applicable to the 100 MHz channel. The
shaded area represents the specified operating range of the
1300 MHz channel.

The "S" annunciator on the 5300 lights during the h igh-resolution mode wheneve
the input is beyond the proper frequency range, or too weak to measure, or during
ac

uisition following signal interruption.

1.

90 MHz - 1300 MHz Input Jack. With RANGE
switch set to A, accepts input frequencies from 90
MHz to 1300 MHz. Input sensitivity is 20mV. 50
ohm input impedance and ac coupled. Maximu
input is 5V rms. Fuse is located inside jack. Use
BNC connector as a wrench to remove and tighten
the fuse jack. Replacement HP part number for fuse
is 2110-0301.

2.

ATTENUATOR Control. Provides manual control
of input attenuator circuit for 1300 MHz channel.
MIN position provides minimum signal attenuation.
MAX position provides maximum attenuation.
AGC circuit

3.

PREAMP POWER. Supplies + 15V @ ≈ 40 mA to

ower 10855A Preamplifier.

4. 100 MHz Input Jack. When RANGE is set to B,

ives >47 dB dynamic range.

OTE

accepts input frequencies from 50 Hz to 100 MHz.
With RANGE set to B HIGH RESOLUTION,
accepts frequencies up to 10 kHz. Input sensitivity
is 20 mV rms. Input impedance is 1 Megohm
shunted b

5.

RANGE switch. Allows selection of either of the
two input channels or the self-check mode. In the
CHK position, allows system to count the internal
10 MHz clock signal. Measurement is not affecte

signals connected to the input jacks.

6.

RESOLUTION Switch. The counter's leas
significant digit displays the measured resolution o
the input signal that is selected with the switch. Fo
example, 10 Hz selected with 6,789 Hz inpu
frequenc

less than 40 pF. Channel is ac coupled.

: counter displays 6.78 kHz.

-

9E-3-2

Figure 9E-3-3. Self-Check Measurements

Model 5305B

Operation

1. Apply input power to 5300 ac receptacle.

2. Turn counter on with 5300 SAMPLE RATE control.
Adjust SAMPLE RATE for minimum display time
(full ccw).

3. Set RANGE switch to CHK position. Display is a
function of RESOLUTION switch.

Resolution
Selector Display Annunciator Display Annunciator

5300A Self Check 5300B Self Check

10 kHz 0010.00 M, Hz 000010.00±1M, Hz

1 kHz 010.000 M, Hz 00010.000±1M, Hz

100 Hz 10.0000 M, Hz, C 0010.0000±1M, Hz, C

10 Hz 0.00000 M, Hz, C 010.00000±1M, Hz, C

1 Hz ●000.000 K, Hz, C 10000.000±1K, Hz, C

.1 Hz ●00.0000 K, Hz, C 0000.0000±1K, Hz, C

●Indicates overflow light is on.

9E-3-3

Model 5305B
Operation

Figure 9E-3-4. 100 MHz Channel Frequency Measurements

9E-3-4

1. Apply power to 5300 ac receptacle.

2. Turn counter on with 5300 SAMPLE RATE control.

3. Set RANGE switch to B position.

4. Connect input signal to 100 MHz jack.

5. Set RESOLUTION switch for number of digits desired
in display.

6. Adjust SAMPLE RATE control for convenient interval
between measurements.

7. For high resolution, set RANGE switch to B 10 kHz

MAX - HIGH RESOLUTION X1000. This limits the
input frequency to 10 kHz but gives resolution up to 4
decimal places.

Model 5305B

Operation

Figure 9E-3-5. 90 MHz -1300 MHz Channel Freque ncy Me asurements

1. Apply input power to ac receptacle.

2. Turn counter on with 5300 SAMPLE RATE control.

3. Set RANGE switch to A position.

4. Set RESOLUTION switch to 10K.

5. Set ATTENUATOR control to MIN position.

CAUTION

Input level must not exceed 5V rms.

6. Connect input signal to 90 MHz -1300 MHz jack.

7. Adjust ATTENUATOR control until counter
stops displaying, then back again until counter
gives a stable display of the proper frequency.

9E-3-5

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SECTION IX E

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5305B 1300 MHz COUNTER

SUBSECTION IV

THEORY OF OPERATION

Theor

Model 5305B

of Operation

9E-4-1 INTRODUCTION.

9E-4-2. The 5305B consists of two assemblies, Logic
Board A1 and 1300 MHz amplifier A2. Two input chan­nels for frequency measurements are provided, Channel A
accepts signals from 90 MHz to 1300 MHz and Channel B
is used for signal inputs up to 100 MHz. Channel B signals
are connected directly to the A1 Logic Board. Channel A
signal inputs are routed to the 1300 MHz Amplifier A2.
The followin

9E-4-3. A1 LOGIC BOARD

9E-4-4. A1 consists of the following major circuits;
High-Impedance Amplifier, Counting, Frequency
Multiplier, and 1300 MHz. Paragraphs 9E-4-5 through
9E-4-30 describe the theor

9E-4-3 High Impedance Amplifier

9E-4-6. The high-impedance amplifier consists o
three main stages: (1) An input buffer (Q1, Q2) that
provides high input impedance at unity gain. (2) An AGC
(automatic gain control) amplifier (U6B and C) to generate
the required gain to maintain a relatively constant output
with a wide range of inputs. This assures that the counter
will read the proper frequency in the presence of noisy
input signals. (3) A Schmitttrigger U6A and driver U16 to
convert noisy, slowchanging signals to "clean" square
waves with fast rise times to drive the countin

9E-4-7. INPUT CIRCUIT OPERATION. The signal
enters the amplifier through dc blocking capacitor C4,
which, along with C7, R10, R7, CR4, and CR2, protects
against large ac peaks at low frequencies. At high
frequencies, R7 and CR4 and CR2 provide the input
protection for the unity-gain boot-strapped sourcefollower
circuit Q1 and Q2.

9E-4-8. AGC OPERATION. For small signal levels
(below ≈10 mV rms), the output of U8 pin 1 is <.6V (with
no input signal, the voltage is about -3.5V). This causes
Q5 and Q4 to turn off which results in Q3 turnin

theory describes the two assemblies.

of operation for these circuits.

circuits.

on.

The low source-to-drain impedance (50Ω) shunts resistor
R12. The signal passes unattenuated through Q3 to amplifier
U6C. The output at U6B(6) feeds the signal through R33 and
C25. The signal is converted to dc by CR9, C24 and R35. As
the input signal level increases, the AGC voltage at U8(1)
increases above .6 volts to a maximum of ≈ +2 volts. Both
CR5 and CR7 begin to conduct and their resistance drops
rapidly to a few ohms, shunting most of the signal to ground.
At the same time, Q5 begins to conduct and causes Q4 to
conduct.

9E-4-9. When Q4 is full on, it generates more than -5 volts
gate-to-source voltage on Q3. This tends to "pinch off" Q3,
thereby raising its resistance. With R6 as the main signal
path, only a small portion (10 to 20 mV p-p) of a large input
signal (10V p-p) drives amplifier U6C. This prevents
saturation of U6, and prevents the degradation in signal-to­noise ratio that saturation would cause. Thus Schmitt trigger
U6A is triggered only by the largest signal at the input and
not noise.

9E-4-10. DC FEEDBACK AND DUTY CYCLE CON­TROL. The first two amplifier stages of U6 have a fixed
voltage gain of typically 30 to 40 with a bandwidth of 100
MHz. U8 monitors the output of U6B and regulates the dc
level at about 1.3V, regardless of temperature and device
differences.

9E-4-11. SCHMITT TRIGGER AND OUTPUT. The
third stage of U6 is used as a Schmitt trigger.This circuit
shapes the .6V p-p sine wave at its input into a .8V p-p
square wave. It will respond to signals less than 0.3V p-p in
amplitude and thus rejects noise on the input signal. U16
amplifies the square wave and converts it to TTL levels to
drive U22.

9E-4-12. Countin

9E-4-13. The following paragraphs describe the counting
circuits that are common to all input modes. The RANGE
switch enables one of four NOR gates to pass its respective
signal to the Main Gate U13A and to the arm flip-flop,
U17B. The signals are (1) Channel A divided by 16, U12C;
(2) Channel B, U12A; (3) Channel B times 1000(PLO),
U12B; and (4) 10 MHz clock (check), U13B.

Circuits

9E-4-1

Model 5305B

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of Operation

Theor

9E-4-14. In the Channel B mode, for example, the
operation is as follows. Once the sample rate runs down
and the INHIBIT line returns high, the next signal pulse
from U12A sets U17B. The High output from U16D(13)
arms the counter by allowing the CLOSE line to go
High. The arm signal also passes the 10 MHz clock
signal to the mainframe through U10A and U10B. The
mainframe responds by clocking U17A with a LOG 0
pulse, which sets the Q output Low and opens the Main
Gate. The signal now passes to the decade counter, U14,
where it is divided by 10. The data output of U14 feeds
U13C, which provides a 60/40 duty cycle of the divided
signal to level translators Q9 and Q10. The signal then
enters the main frame's countin

assembly on the F1 line.

OTE

U6, 12. 13, 14, 17, and 25 are ECL devices
that are connected to the +5V supply. They set
the logic states to ≈ 4.3V for a High and ≈

3.2V for a Low.

9E-4-15. The measurement ends when the count in the
mainframe's Time Base decade reaches its capacity.
The decade then outputs a TB OUT pulse. The LOG
pulse immediately following sets the MGFF and
disables the Main Gate, U13A. During the mea­surement, the three-state data latch, U5, does not accept
any new input data. Its output, however, is enabled
periodically by the Low pulse from U4(15). Because of
the counting decade in the 5305B, U4 alters the Digital
Address codes so the digits are correctly placed in the
display. Therefore, the Σ4 output goes Low for one
count out of eight and switches the latch from its high
impedance state to the low impedance (active) state.

This occurs for each scan of the display. When the
measurement ends, the XFER line enables U4 and new data
enters the latch with the next clock pulse from U11(4).

9E-4-16. Frequency Multiplier

9E-4-17. The Frequency Multiplier circuit contains a PLO
(Phase-Locked Oscillator) that is used when the RANGE
switch is set to the B 10 kHz MAX position. The PLO
multiplies the Channel B input frequency by 1000. which
means the display's count will be 1000 times higher than
normal. Thus, for a 51.234 Hz input and a 1 sec gate time,
the counter's display would be 00.051 kHz without the PLO
and 51.234 Hz with the PLO. The readout is corrected by
changing the annunciator from MHz to kHz or kHz to Hz.
The phase detector block diagram is shown in Figure 9E­4-1.

9E-4-18. PHASE DETECTOR. The signal to be mea­sured passes through the channel B amplifier and is applied
to pin 1 of U22, a phase/frequency detector. The other input
to U22 is the voltage-controlled oscillator's signal, which
has been divided by 1000 in U19, 20, and 21. U22 is a TTL
device with negative edge-triggered inputs and active low
outputs. Under normal, phase-locked operation, the negative
edges at the inputs occur at the same moment, and the two
outputs are hi

h.

9E-4-19. Under these conditions, the two diodes following
the detector (also part of U22) are back-biased and pass no
current. Thus, no current enters the integrator amplifier,
U23, and its output volta

e remains fixed.

9E-4-2

Figure 9E-4-1. Phase Detector Block Diagram

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Model 5305B

of Operation

9E-4-20. Assume, however, the channel B frequency
increases. This causes the negative pulses at U22(1) to
arrive a little earlier than before, arriving ahead of the
edges at pin 3. When an edge arrives at pin 1, the UP
output goes active low and stays low until the edge at pin 3
arrives. The UP output, then, begins generating active low
pulses. They are inverted into positive pulses that forward
bias CRB Current flows through CRB and RBI into the
integrator amplifier U23, causing the tuning voltage to
integrate downward, this increases the PLO's output and
increases the feedback frequency at U22 pin 3. This
process continues until the signals at U22 pins 1 and 3 are
again matched in frequency and phase. The phase detector
outputs are inactive hi

h, and the loop is at reset.

9E-4-21. THE VCO. The phase detector's corrections are
integrated and saved by the loop amplifier, an integrating
amplifier (refer to A1 schematic). This makes a tuning
voltage that sets the frequency of the VCO (voltage­controlled oscillator). The oscillator is a sawtooth
generator driving a Schmitt trigger. The voltage-controlled
current source (Q16) charges capacitor C42 in a linear
ramp until the ramp reaches about +2.4 volts. This goes
through an emitter follower (Q17) and appears at U24C(9)
at + 1.8 volts. This is the upper trigger point on the
Schmitt gate. The output of U24C snaps low and
discharges C42 through CR21 to about +0.6 volts. This is
below the negative threshold, so the Schmitt output snaps
high and the sawtooth starts again. The negative pulse
train at U24C(8) is used as the PLO output, and it is this
frequency that is counted by the decade counter. The
waveforms would appear as follows in Fi

ure 9E-4-2.

It is important to remember that the frequency/tuning
voltage (U23 pin 6) is a negative relationship. That is, the
lower the tunin

voltage, the higher the frequency.

9E-4-23. SEARCH INDICATOR CIRCUIT. The VCO
runs continuously whether the loop is locked (normal
operation) or not. In the high resolution range, there is
always a signal from the VCO to the 5305B counting
circuitry, whether or not there is a signal at the Channel B
input. As a result, the counter is always armed and tries to
count the VCO frequency (typically 25 kHz) even without
an input. This is prevented by the search indicator circuit,
U16A, U18C, U24A, Q19.

9E-4-24. When the detector's inputs are in phase, the U22
output pins (2 and 13) are always TTL high. If the loop is
not locked, one or the other will be low much of the time.
Whenever either is low, U24B(6) is high, signaling an
error in the loop. These error pulses are averaged by R77,
R78, and C36. If the errors are large enough, the LOST
line from comparator U16A will snap low in about 50
msec. In the high resolution range, LOST passes through
gate U18C and becomes STOP (active high). STOP lights
the SEARCH lamp (S annunciator) through Q14 and gates
off the 10 MHz clock at U10A. This prevents the counter
from continuing with more measurements or display
updates and saves the last valid reading in the display.
LOST enables gates U18 Band D, which pass the phase
correction signals through resistor R76 (5.1KΩ). R76 is in
parallel with R81 (82KΩ, so R81 is effectively reduced
from 82K ohm to about 5K ohm. This greatly increases
loop bandwidth and allows for rapid searches and short
acquisition times.

ure 9E-4-2. VCO Waveforms at about 2 MHz

Fi

9E-4-22. When the VCO is running at much less than 10
MHz, it becomes very difficult to see the narrow pulses at
U24C(8) on a scope. It is easier to see the sawtooth or a
squarewave at half the VCO frequenc

at U21(9).

9E-4-25. When an in-range input signal is restored to
Channel B, the loop will lock. The phase corrections stop,
U24B(6) (the error signal) stays low, and C36 discharges
through R77 (100K ohm). As the average error signal
drops through +1 volt, the lower threshold, U16A(1) snaps
high, and STOP goes low. U24A(3) inverts this negative
edge into a positive edge and Q19 is switched on for about

0.1 seconds. This clears all the counters and the time base,
so a new measurement is begun, making the first reading
correct. Meanwhile the SEARCH light is switched off,
and the loop bandwidth is reduced to a low value to allow

roper stability for accurate measurements.

9E-4-26. NON-LINEAR VCO CHARACTERISTIC.
When no signal is available at the PLO input, the VCO is
tuned to its lowest frequency (about 25 kHz). If a high
frequency (e.g., 10 kHz) is applied, the VCO must be
slewed all the way to 10,000 kHz to achieve lock. This
would take a loop that is stable at 50 Hz almost two
minutes to achieve lock. Therefore, gates U18 Band D,
were added, and the VCO characteristic has a bend in it.
See Fi

ure 9E-4-3.

9E-4-3

Model 5305B

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of Operation

9E-4-27. This puts a step in the loop bandwidth at about
300 Hz input, increasing loop bandwidth drastically above
300 Hz. (Higher loop bandwidth is allowable at higher input
frequencies.) This greatly reduces acquisition time for a 10
kHz input.

Figure 9E-4-3. VCO Characteristics

9E-4-28. This "bend" in the VCO curve is accomplished by
CR24 and R90. The corrected tuning voltage is the voltage
between Q16's emitter and the +12 volt supply. The current
is set by the resistance between those points. For corrected
tuning voltages less than about 2 volts (actual tuning voltage
above +9.4 vots), the tri-diode CR24 is off and out of the
circuit. The effective resistance is R90 plus R83, or about
6500 ohms. For larger corrected tuning voltages (higher
frequencies), the tri-diode is on and shorts R90, removing it
from the circuit. Now the effective resistance is R83, or 270
ohms.

9E-4-30. 1300 MHz ÷ Circuit

9E-4-31. The A2 board amplifies the Channel A signal and
then divides it by four before sending it to A1 via J2(9). U26
divides the EECL signal by two before Q18 converts the
signal to ECL. Another divide-by-two stage is provided by
U25. Differential amplifier Q12 and Q13 converts the signal
to a positive driven ECL (H = 4.3V, L = 3.2V). Q11

rovides a low impedance to U12's input.

9E-4-32. A2 1300 MHZ AMPLIFIER ASSEMBLY

9E-4-33. The 1300 MHz Amplifier assembly (A2) consists
of circuitry to amplify, prescale, and detect signals up to
1300 MHz. Input signals are routed through a protective fuse
F1 to the 1.3 GHz limiter circuitry. The limiters consist of
CR2, 7, 1, 4 and limit the input to approximately 5V rms. A
voltage controlled attenuator made up of pin diodes CR5, 6,
8, and 9 provides variable attenuation as determined by an
AGC circuit.

9E-4-34. The attenuator output connects to U2 which
provides 20-24 dB gain. U3 divides the signal by 2 and
routes it to U4 where it is divided by 2 again. Since U3 has
no Schmitt trigger, U3 is set for maximum sensitivity.
Operating at maximum sensitivity gives U3 a tendency to
oscillate when no input signal is applied. To maintain high
sensitivity and prevent oscillations, R22 is adjusted to
desensitize U3 when the ARM line is high and produce high
sensitivity when the ARM line is low. This allows the
counter readings to "snap on" from no input signal to the
exact reading when a signal is applied. The amount of "snap
on" feedback is controlled by A1R71. The greater the "snap
on" feedback, the less the possibility of partial counts, but
also the lower the sensitivit

.

9E-4-29. MISCELLANEOUS A1 CIRCUITS. R84 (330K
ohm) sets the lowest VCO frequency at about 25 kHz,
corresponding to a 25 Hz input. Otherwise, the VCO could
actually go to 0 Hz, and the phase detector outputs would go
high because the VCO would appear to be locked to a 0 Hz
input (no input). This would turn off the search indicator.
C47 (100 pF) sets the width of the narrow low-going pulse
at the VCO output, U24C(8). Diode CR17 prevents the
tuning voltage from going too low when the loop tries to
acquire an excessive high input signal (above 11 kHz). Pin 3
of the loop amplifier is biased at + 1.5 volts. This forces pin
2 to also be at + 1.5V which is a good bias point to allow

roper operation of the diode switches.

9E-4-4

9E-4-35. As the input level increases, the level into A2U1
increases. A bridge circuit comprised of CR11, CR12 and
associated resistors including R13 which balances the
bridge. As the input level to the bridge increases, the
rectified bridge output drives the input to U1 to cause the
output of U1 to go low. This reduces the amount of current
through A1R9, R1 (sen. pot), L4, L1, CR6, CR8, and R11.
As the current through this path decreases, the resistance of
the PIN diodes (CR6, 8) increases to offer more attenuation
to the input signal. Similarly, the current increases through
CR9, R10, R1, R3, R6, R7, CR5 and R2, which decreases
the resistance of CR5 and CR9 to shunt more of the signal to

round through C5 and C9.

SECTION IX E

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5305B 1300 MHz COUNTER

SUBSECTION V

MAINTENANCE

Model 5305B

Maintenance

9E-5-1 INTRODUCTION

9E-5-2. This subsection contains maintenance information
for Model 5300/5305B 1300 MHz Counter. Performance
checks, adjustment procedures, and tests to isolate defective
components are included.

9E-5-3. RECOMMENDED TEST EQUIPMENT

9E-5-4. Test equipment recommended for performance
checking and servicing the 5300B/5305B 1300 MHz Counter
is listed in Table 9E-1-1 and in Table 5-1 in the 5300B
portion of the manual. Test equipment with equivalent
characteristics ma

9E-5-5. IN-CABINET PERFORMANCE CHECK

9E-5-6. Use the performance check in Table 9E-5-1 and
the test card at the back of this subsection to verify proper
operation of all circuits in the counter and all circuits in the
5300 that are used with the counter plug-on. The performance
check ma

a. As part of an incoming inspection check of instrument
specifications.

b. Periodically, for instruments used in systems where
maximum reliability is important.

c. As part of a procedure to locate defective circuits.

d. After any repairs of adjustments, before returning

9E-5-7. INSTRUMENT ACCESS

be used:

instrument to re

be substituted for listed equipment.

ular service.

c. When latches are fully extended rearward, the 5300

and 5305B cast housings should be separated by
about 1/8-inch.

d. Lift the 5300 gently away from the 5305B.

e. Separate 5305B Board Assembly from the cast

housing as follows (refer to Figure 9E-5-1):

(1) Press rear, plastic-nylon retaining clips on each

side of 5305B casting and lift the rear of the
5305B Assembly to release it from the casting.

(2) Press front plastic-nylon retaining clips on each

side of 5305B casting and lift the front of the
Board Assembly to release it from the casting.

(3) Lift Board Assembly from the casting.

f. Mate the 5305B Board Assembly to the 5300 and apply

ac power.

g. To reinstall the Board Assembly into the casting,

reverse procedure of steps d throu

9E-5-9. PERIODIC MAINTENANCE

9E-5-10. To determine if the 5300B/5305B is operating
properly, perform the In-Cabinet Performance Checks
listed in Table 9E-5-1.

9E-5-11.

9E-5-12. BOARD REMOVAL. When removing the
printed circuit board for replacement, repair, or servicing,
always remove ac power and separate the board from the
castin

MAINTENANCE AND REPAIR

according to Paragraph 9E-5-8, steps a to e.

h f.

9E-5-8. For access to the plug-on assembly, separate the
5300 from the 5305B as follows:

a. Turn ac power OFF and disconnect power cord.

b. Pull the two side casting latches fully rearward ( it is

necessary to press the latch handles gently away from
the center of the instrument to unlock them).

9E-5-13. COMPONENT REPLACEMENT. When re­placing a circuit board component, use a low heat soldering
iron. Heat may be used sparingly as damage to the circuit
foil may result. Mounting holes may be cleaned out with a
toothpick while heat is applied. Connection should be
cleaned with a cleaning solution after component removal
and replacement.

9E-5-1

Model 5305B

STEP A

S

Maintenance

Figure 9E-5-1. Separation Procedure

TEP B

9E-5-2

Table 9E-5-1. In-Cabinet Performance Check

S

C

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3. CHANNEL B

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1.

ELF-CHECK

Perform Self-Check procedure, Figure 9E-3-3.

2.

HANNEL A

Obtain the following test equipment:

HP 8660B/86602A Synthesized Signal Generator

a. On 5305B, set RANGE to A, RESOLUTION to 1K, and ATTENUATOR to MIN.

b. Set signal generator to 90 MHz at 20 mV.

c. Connect 8660B/86602A Signal Generator output to 90 MHz to 1300 MHz jack of 5305B.

d. Check frequencies in band of 90 to 1300 MHz. Counter should display selected frequency.
count li

ht (C) must be flashing.

e. Set ATTENUATOR control to MAX. Counter should stop counting.

Model 5305B

Maintenance

Obtain the following test equipment:

HP 651B Test Oscillator
HP 8660B/86602A Synthesized Signal Generator
HP 11048A 50-ohm Feed-Thru Termination

a. On 5305B, set RANGE to B and RESOLUTION to 100 Hz.

b. Set 8660B/86602A Signal Generator to 100 MHz at 20 mV.

c. Connect signal generator output to 100 MHz jack of 5305B using 50-ohm feed-thru.

d. Check frequencies in band of 100 MHz down to 1 MHz. Counter should display selected frequency.
count li

ht (C) must be flashing.

e. Disconnect signal generator and connect a 651B test oscillator. Retain 50-ohm feed-thru.

f. On 5305B, set RESOLUTION to 1 kHz.

. Set 651B to 1 MHz at 20 mV.

h. Check frequencies in band of 1 MHz down to 50 Hz. Counter should display selected frequency.
count li

ht (C) must be flashing.

i. At 50 Hz, counter should display 00000.050 kHz.

j. On 5305B, set RANGE to B 10 kHz MAX.

k. The S light should light momentarily, and the display should read (display all 8's).
counter should then displa

00050.000 Hz. Count light (C) must be flashing.

9E-5-3

Model 5305B

O

Maintenance

PERF

RMANCE CHECK TEST CARD

Hewlett-Packard Model 5305B Test Performed by:
1300 MHz COUNTER

Serial No. Date:

Description Check

1. SELF CHECK

2. CHANNEL A

Sensitivity (20 m V) ٱ
Frequency Range (90-1300 MHz) ٱ
Attenuator

3. CHANNEL B

Sensitivity (20 m V) ٱ
Frequency (50 Hz-100 MHz)
High Resolution Mode ٱ

ٱ

ٱ

ٱ

ٱ

ٱ

9E-5-3A

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Model 5305B

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Maintenance

9E-5-14. INTEGRATED CIRCUIT REPLACEMENT. Two
methods are recommended for removin

integrated circuits:

a. Solder Gobbler. Solder is removed from board by a

soldering iron with a hollow tip connected to a vacuum
source. The IC is removed intact, so it may be reinstalled
if diagnosis is wrong.

b. Clip Out. This method is used when an IC is proven

defective. Clip leads close to case, apply heat, and
remove leads with long-nose pliers. Clean board holes
with toothpick and cleanin

solution.

9E-5-15. ADJUSTMENTS

9E-5-16. The 5305B has two adjustments; Channel A and
Channel B. The adjustments should be made when the in­cabinet performance test indicates the need, or when repairs
are made which would affect the ad

ustment settings.

9E-5-17. CHANNEL A ADJUSTMENTS

. Set A2R13 and A1R71 to full ccw. Set A2R22 to mid-

range.

c. Connect 5300B/5306A voltmeter positive lead to J2

pin 5 and negative lead to rear panel.

d. Adjust A1R79 for 15V reading.

e. Connect test setup shown in Figure 9E-5-2.

OTE

If meter on 8660B/86602A is calibrated, a 3
foot coaxial cable may be substituted for the
power splitter and power meter. Determine
the drop in cable (≈ 1 dB).

f. Set signal generator to 1.29999999 GHz at 30 mV.

g. Adjust A2R22 for maximum sensitivity. (Reduce

signal level until A2R22 is adjusted for maximum
sensitivity.)

h. Set signal generator to 90 MHz.

9E-5-18. The following steps outline proper adjustment

rocedure for the Channel A amplfier.

a. On 5305B, set RANGE to A, RESOLUTION to 1K,
and ATTENUATOR to MIN.

Fi

ure 9E-5-2. Test Setup for 1300 MHz Adjustment

i. If counter displays a steading reading of 00270.XXX

MHz, adjust output level of generator until counter
reads 00268.XXX MHz.

j. Adjust A1R71 cw until count light (C) stops blinking.

9E-5-5

Model 5305B

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Maintenance

k. Slowing increase generator output level and observe

counter display. 5305B must never count 00180.XXX
MHz. If it does, adjust A1R71 cw until count light (C)
stops blinkin

l. Set generator output to 1.29999999 GHz at -21 dBm as

measured on power meter. 5305B should count

01299.999 MHz ±1 count.

m. Reduce generator level until counter barely counts

01299.999 MHz ± 1 count.

n. Adjust A1R71 cw if 5305B ambiguity is greater than ±1

count.

o. Adjust A2R22 cw until counter barely counts

01299.999 MHz ±1 count.

p. Input power to 5305B should be ≤ -21 dBm.

q. Set input level to -21 dBm and scan frequency down to

90 MHz. Counter should display same reading as
8660B ±1 count.

r. Set generator to 90 MHz at -5 dBm.

s. Connect 5306A voltmeter to TPG and adjust

A2R13 cw until 5306A reads +12V ±1V.

.

h. Set 8660B/86602A Signal Generator to 100 MHz at

±2mV and connect output of generator to 100 MHz
input usin

i. Increase generator level until counter displays stable

MHz ±1 count.

J. Adjust A1R18 ccw to point where 5305B barely continues

to make measurements. (Any more ccw rotation will stop

ating.)

k. Input signal must be 20 mV or below.

9E-5-21. TROUBLESHOOTING

9E-5-22. Use the following troubleshooting information, the
waveforms, and schematic diagram in subsection VIII to
isolate troubles in the counter to a defective component.

9E-5-23. If a malfunction is suspected, operate the counter
in the self-check mode (see Figure 9E-3-3) and analyze the
front-panel indicators for evidence of improper operation.
Some troubles can be quickly isolated in this manner. The
self-check procedure exercises most of the counter circuits; the
input circuits for both channels are notable exceptions.

a 50-ohm feed-thru.

100

9E-5-19. CHANNEL B ADJUSTMENTS

9E-5-20. The following steps outline proper adjustment

rocedure for Channel B amplifier.

a. On 5305B, set RANGE to B and RESOLUTION to

1 Hz.

b. Set A1R44 to midrange and A1R18 to full cw.

c. Set 651B Test Oscillator to 50 Hz at 3V rms and

connect directl

d. Measure AGC voltage at TP A with 5300B/5306A
voltmeter.

e. Adjust A1R44 for 1.75V reading on voltmeter.

AGC voltage should decrease when level
of input signal is reduced. With no input
si

nal, AGC voltage should be negative.

f. Disconnect 651B Test Oscillator.

g. On 5305B, set RANGE to B and RESOLUTION to 10

Hz.

to 100 MHz input on 5305B.

SERVICE NOTE

9E-5-24. To determine if a problem exists in both input
channels or just one channel, then perform the appropriate
troubleshooting procedure. Be sure to perform each step in
sequence. The followin

a. HP 10525T Logic Probe

b. HP 180A/1801A/1821A Oscilloscope

c. HP 651B Test Oscillator

d. HP 8660B/86602A Synthesized Signal Generator

9E-5-25. 100 MHz Channel Troubleshootin

9E-5-26. Set the RESOLUTION switch to 1 kHz and the
RANGE switch to 100 MHz. Supply a 9 kHz, 1-volt
sinusoidal input to the channel. Perform the followin

a. Check output of Channel B at A1 U6(3). See wave form

photos in Subsection VIII.

b. If proper signal is not present, compare waveforms with

those provided in Subsection VIII.

c. If proper signal is present, check operation of U12C.

test equipment is required:

steps:

9E-5-6

p

Model 5305B

p

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r

e

Maintenance

9E-5-27. 1300 MHz Channel Troubleshooting

9E-5-32. The following table shows the display results

when one of U4's outputs is stuck in one logic state.
9E-5-28. Set the RESOLUTION switch to 1 kHz and
the RANGE switch to A. Supply a 100 MHz, 25-millivolt,

Important: set RESOLUTION switch to 10 kHz and use

1.25 MHz in

ut signal.

sinusoidal input to the channel and perform the following
ste

s.

Table 9E-5-2. Erroneous Displays Caused by U4

a. Check the EECL output of A2 at A2 pin 9 with

oscilloscope. See waveform photos in Subsection
VIII.

b. If signal is not present at pin 9, check input fuse

located in front panel jack before troubleshooting the
assembly. See Subsection VIII for dc checks of A2.

c. If proper signal is present at A2 pin 9, check

operation of U26, U25, Q13, Q11, and U12 on the A1
board.

Shorted to Ground Display

Σ3 (pin 2) 012.00120 MHz
Σ2 (pin 6) 000.12120 MHz
Σ1 (pin 9) 000.00220 MHz

Σ4 (pin 15) 000.00105 MHz

Stuck High Display

Σ3 (pin 2) 000.b0005 MHz
Σ2 (pin 6) bbb.00005 MHz
Σ1 (pin 9) b00.00115 MHz

Σ4 (pin 15) 000.0012b MHz

9E-5-29. Both Channels Inoperative

(or outputs of U5

are inactive)
9E-5-30. Set RESOLUTION switch to 1 Hz position,
RANGE switch to B, and apply 1 MHz sinusoidal input to

= blank

the 100 MHz channel from a 651B Test Oscillator.

9E-5-33. Compare waveforms with those provided in

a. If any digit is blank, proceed to "Address Decode

Troubleshooting" in Paragraph 9E-5-31, also, at this

Section VIII. Σ4 should be low for 1/8 of the period. The
code for U4 appears as shown below.

time, note the unique displays listed under that
heading.

b. If only the least-significant digit is displayed, and

all others are zero, check U13C, Q9, and Q10.

c. If only decimal point problems occur, check A1P1

(34, 46,47, and 48) and the RESOLUTION switch.

A3 A2 A1 Σ4 Σ3 Σ2 Σ1

LLL LHHH

LLH HLLL

d. Check U13A(5) for presence of input signal

using oscilloscope. If not present, check operation
of selected NOR gate responsible for passing signal.

LHL HLLH

LHH HLHL

HLL HLHH

. Check for presence of clock signal at U10B(6). (U9A

pin 3 should be a TTL low during gate time to pass
clock pulses. If not, check input at U9A(1). If input
does not toggle, continue to next step.

H LH HHL L

H HL HHL H

H HH HHHL

. Using an osilloscope, check that U17 A(2) toggles

(should be low (≈3.2V) during gate time). If not,
check U17, Q7, and Q8.

g. With an oscilloscope, check that outputs of U14

are toggling (indication of counting).

9E-5-34. Frequency Multiplier

9E-5-35. Before troubleshooting the Frequency Mul­tiplier circuit, ensure the Channel B amplifier is working
properly. Apply a 1 kHz, 100 m V signal to Channel B;

h. Check that CLOSE line toggles. If not, check

U17B, U16D, and CR10.

9E-5-31. ADDRESS DECODER TROUBLESHOOT­ING. Because the 5305B contains one decade of infor­mation, the Digit Address lines that strobe data onto the
display must be altered to accommodate the extra digit.
These code lines are altered in A1U4 and sent to the
mainframe as Digit Select lines.

set RANGE to B 10 kHz MAX and RESOLUTION to 1
Hz.

a. Check input to PLO at U22(1). It should be a 1

kHz square wave. If not, check U16B(2).

b. Check supplies: +5V on U21(14), U24(14); +

12V at U23(7).

9E-5-7

Model 5305B

g

f

Maintenance

c. Check Loop Amplifier U23. For a 1 kHz input U23(6)

should be about +9V to + 10V. If it is + 11 V or
higher. the loop responds as if the VCO output
frequency is too high. This is true when the loop is
receiving no input at U22(1). If U23(6) is low (about
+4 volts), the loop responds as if the VCO frequency is
too low and tries to increase it. This would indicate a
bad VCO (U24 pin 8) or a bad + 1000 chain (U21,
U20, and U19).

9E-5-36. VOLTAGE-CONTROLLED OSCILLATOR.
To check the VCO, connect an oscilloscope to U21(9).
There should be a square wave at half the VCO frequency.
For a 1 kHz input, the VCO output should be 1 MHz, 1000
times the input. The VCO should run between 25 kHz (U23­6 at + 11 volts) and 11 MHz (U23-6 at +4 volts). If a square
wave appears at U21(9) from 12 kHz to 5.5 MHz, the
frequency should relate roughly to the voltage at U23-6. If
not, probably trouble is in circuitry associated with Q16,
R83, C42 or U24(9) If there is no indication at U21-9, check
the same circuits. Also, check that U23(6) is above +4 volts
otherwise the VCO tends to shut off. CR17 should prevent
this.

9E-5-37. If there is no indication at U21(9), connect the
scope to U24(9) and check for the following sawtooth
volta

e at the output frequency.

9E-5-38. If the waveform is improper, the VCO is faulty. I
the signal is present, and not at U21(9), U21 probably is bad.
If the signal is between 12 kHz and 5 MHz at U21(9), there
should be 1/500 of that at U22(3). If not, U19, U20 and/or
U21 are faulty.

9E-5-39. DETECTOR CIRCUIT. Check U23(3); it should
be at +1.5 volts ±.3 volts. A problem here will saturate U23.
Now test U22, the detector. If U22(1) has a faster frequency
than U22(3), U22(13) should be low part or all of the time at
a rate similar to that at U22(3).
U22(2) should always be TTL high (≈+ 3.5V).

9E-5-8

g

g

y

Model 5305B

g

y

Maintenance

9E-5-40. If the reserve is true, i.e., the frequency at U22(3) is
greater than U22(1), then U22(2) should pulse low (or stay
low if nothing at pin 1). and U22(13) should always be high.
Pins 2 and 13 can never be low to

ether.

9E-5-41. "S" LIGHT ON, NO MEASUREMENTS. It is
possible that the PLO is working properly but no
measurements are made. If the negative edges of the signals
at U22(1 and 3) match, the PLO is working properly. U22(2
and 13) should be high almost all the time, and U24(6) should
be low almost always (small positive pulses). Then U16(1)
(LOST) should be at TTL 1 (+5 volts). If not, there is
something wrong with it or associated parts R77, R78, R59,
R61, R62, R70 or R36. Also, U18(10) (STOP) should be low.
When STOP is high, counter operation is frozen by stopping
the clock at U10(13), and the "S" li

ht is lit.

9E-5-42. FAULTY DISPLAYS WITH NO INPUT. When
the input is disconnected, the display should hold last reading,
if not check the stop circuits (U24, U16, and U18).

9E-5-43. INCORRECT FIRST READING. The first
measurement after a signal is applied should be accurate. If
way off, the reset circuit Q19 is not working. About 1/2
second after a signal is applied, U18(10) should go low,
U24(3) should go high and Q19 should saturate for about
1/10 second. This should pull J1-32 (50 pin connector) low
and the s

stem should "manual reset".

All 8's should show in the display (5300B) for 1/10 second,
then 0's until new measurement displayed at end of gate time.
If not, there are problems around Q19, R91, R92, R93 or C48.

9E-5-44. SLOW ACQUISITION. If the 5305B takes more
than about 1 second to make a measurement (plus gate time)
after a signal is applied to the PLO, circuit problems exist.
With no signal, check that U16(1) is low (LOST). U18 should
be enabled, and low rate (25 Hz) pulses should appear at
U18(1) (same as of U22 pin 2). Connect a 20 kHz signal and
check for pulses at U18(13). The S light should be on during
this time. Check CR16 and CR18. If CR24 (a tri-diode) is
open, tuning will be slow and the upper frequency limit will
be very low. If CR20 and CR22 are open, the loop will be
sli

htly erratic.

9E-5-45. NOT ENOUGH RANGE (10 kHz). If the PLO
will not measure high frequencies (10 kHz). check CR24 and
ensure proper values of R83, C42, and C47. The tuning
voltage at U23(6) should be about +4V at the highest
frequenc

. Also, check the + 12V supply.

9E-5-46. POOR LOW-FREQUENCY RANGE. If the
counter does not measure low frequency (50 Hz). check Q16
for leakage. Ensure that U23(6) can pull voltage high enough
(Q16 should be off at the lower frequency limit). Check C49,
C47, and CR21 and check for +1.5V at U23(3).

9E-5-9

SECTION IX E

5305B 1300 MHz COUNTER

SUBSECTION VI

REPLACEABLE PARTS

Model 5305B

Replaceable Parts

9E-6-1. INTRODUCTION

9E-6-2. This subsection contains information for ordering
replacement parts. Table 9E-6-1 lists parts used in the
standard counter in alphanumeric order of their reference
designators and provides the following information for
each part. Table 9E-6-2 lists parts used in Option 001.

9E-6-3. ORDERING INFORMATION

9E-6-4. To obtain replacement parts, address order to
your local Hewlett - Packard Sales and Service Office (see
lists in section VI of the 5300 manual for addresses).
Identify parts by their Hewlett-Packard part number. To
obtain a part that is not listed, include:

Miscellaneous parts are listed at the end of Table 9E-6-1.

a. Instrument model number.

a. Hewlett-Packard part number.

b. Description of part (see abbreviation below).

c. Total quantity used in the instrument (shown only

b. Instrument serial number.

c. Description of the part.

after the first entry for a given part).

d. Function and location of the part.

d. Typical manufacturer of the part in a five-digit code

(see list of manufacturer's in Table 9E-6-2).

e. Manufacturer's part number.

REFERENCE DESIGNATIONS

A = assembly E = miscellaneous electrical MP = miscellaneous TP = test point
AT = attenuator; isolator; part mechanical part U = integrated circuit;

B = fan; motor FL = filter (movable portion); V = electron tube
BT = battery H = hardware plug VA = voltage regulator;
C = capacitor HY = circulator Q = transistor; SCR; triode breakdown diode
CP = coupler J = electrical connector thyristor W = cable; transmission
CA = diode; diode thyristor; (stationary portion); A = resistor path; wire

DC = directional coupler S = switch Y = crystal unit-piezo­DL = delay line K = relay T = transformer electric
DS = annunciator; signaling L = coil; inductor TB = terminal board Z = tuned cavity; tuned

visual); lamp; LED

termination F = fuse P = electrical connector microcircuit

varactor jack AT = thermistor X = socket

device (audible or M = meter TC = thermocouple circuit

ABBREVIATIONS

A = ampere BCD = binary coded decimal COMP = composition °K = degree Kelvin
ac = alternating current BD = board COMPL = complete DEPC = deposited carbon
ACCESS = accessory BE CU = beryllium copper CONN = connector DET = detector
ADJ = adjustment BFO = beat frequency CP = cadmium plate diam = diameter
AID = analog-to-digital oscillator CAT = cathode-ray tube DIA = diameter (used in
AF = audio frequency BH = binder head CTL = complementary tran- parts list)
AFC = automatic frequency BKDN = breakdown sistor logic DIFF

AGC = automatic gain control BPF = bandpass filter cw = clockwise div = division
AL = aluminum BAS = brass D/A = digital-to-analog DPDT = double-pole,double­ALC = automatic level control BWO = backward-wave dB = decibel throw
AM = amplitude modulation oscillator dBm = decibel referred to DA = drive
AMPL = amplifier CAL = calibrate 1 mW DSB = double sideband
APC = automatic phase ccw = counterclockwise dc = direct current DTL = diode transistor logic

ASSY = assembly CHAN = channel interval or difference) ECL = emitter coupled logic
AUX = auxiliary cm = centimeter ° = degree (plane angle) EMF = electromotive force
avg = average CMO = coaxial °C = degree Celsius EDP = electronic data
AWG = american wire gauge COEF = coefficient (centrigrade) processing
BAL = balance COM = common °F = degree Fahrenheit ELECT = electrolytic

control BP = bandpass CW = continuous wave AMPL = differential amplifier

control CEA = ceramic deg = degree (temperature DVM = digital voltmeter

9E-6-1

Model 5305B
Replaceable Parts

ABBREVIATIONS (CONTINUED)

ENCAP = encapsulated min = minute (time) PIV = peak inverse voltage TFT = thin-film transistor
EXT = external …’ = minute (plane angle) pk = peak TGL = toggle
F = farad MINAT = miniature PL = phase lock THD = thread
FET = field-effect transistor mm = millimeter PLO = phase lock oscillator THRU = through
F/F = flip-flop MOD = modulator PM = phase modulation TI = titanium
FH = flat head MOM = momentary PNP = positive-negative- TOL = tolerance
FOL H = fiIIister head MOS = metal-oxide semi- positive TRIM = trimmer
FM = frequency modulation conductor P/O = part of TSTR = transistor
FP = front panel ms = millisecond POLY = polystyrene TTL = transistor-transistor
FREO = frequency MTG = mounting PORC = porcelain logic
FXD = fixed MTR = meter (indicating POS = positive; position(s) TV = television
g = gram device) (used in parts list) TVI = television interference
GE = germanium mV = millivolt POSN = position TWT = traveling wave tube
GHz = gigahertz mVac = millivolt, ac POT = potentiometer U = micro (10
GL = glass mVdc = millivolt, dc p-p = peak-to-peak parts list)
GND = ground(ed) mVpk = millivolt, peak PP = peak-to-peak (used in UF = microfarad (used in
H = Henry mVp-p = millivolt, peak-to-peak parts list) parts list)
h = hour mVrms = millivolt, rms PPM = pulse-position UHF = ultrahigh frequency
HET = heterodyne mW = milliwatt modulation UNREG = unregulated
HEX = hexagonal MUX = multiplex PREAMPL = preamplifier V = volt
HD = head MY = mylar PRF = pulse-repetition VA = voltampere
HDW = hardware µA = microampere frequency Vac = volts ac
HF = high frequency µF = microfarad PRR = pulse repetition rate VAR = variable
HG = mercury µH = microhenry ps = picosecond VCO = voltage-controlled
HI = high µmho = micromho PT = point oscillator
HP = Hewlett-Packard µs = microsecond PTM = pulse-time modulation Vdc = volts dc
HPF = high pass filter µV = microvolt PWM = pulse-width modulation VDCW = volts dc, working (used
HR = hour (used in parts list) µVac = microvolt, ac PWV = peak working voltage in parts list)
HV = high voltage µVdc = microvolt, dc RC = resistance capacitance V(F) = volts. filtered
Hz = Hertz µVpk = microvolt, peak RECT = rectifier VFO = variable-frequency
IC = integrated circuit µVp-p = microvolt, peak-to- REF = reference oscillator
ID = inside diameter peak REG = regulated VHF = very-high frequency
IF = intermediate frequency µVrms = microvolt, rms REPL = replaceable Vpk = volts peak
IMPG = impregnated µW = microwatt RF = radio frequency Vp-p = Volts peak-to-peak
In = inch nA = nanoampere RFI = radio frequency Vrms = volts rms
INCD = incandescent NC = no connection interference VSWR = voltage standing wave
INCL = include(s) N/C = normally closed RH = round head; right hand ratio
INP = input NE = neon RLC = resistance-inductance- VTO = voltage-tuned oscillator
INS = insulation NEG = negative capacitance VTVM = vacuum-tube voltmeter
INT = internal nF = nanofarad RMO = rack mount only V(X) = volts. switched
kg = kilogram NI PL = nickel plate rms = root-mean-square W = watt
kHz = kilohertz N/O = normally open RND = round WI = with
kΩ = kilohm NOM = nominal ROM = read-only memory WIV = working inverse voltage
kV = kilovolt NORM = normal R&P = rack and panel WW = wirewound
Ib = pound NPN = negatlve-posltlve- RWV = reverse working voltage W/O = without
LC = inductance-capacitance negative S = scattering parameter YIG = yttrium-iron-garnet
LED = light-emitting diode NPO = negative-positive zero s = second (time) Zo = characteristic
LF = low frequency (zero temperature …’’ = second (plane angle) impedance
LG = long coefficient) S-B = slow-blow (fuse (used
LH = left hand NRFR = not recommended for in parts list)
LIM = limit field replacement SCR = silicon controlled
LIN = linear taper (used in NSR = not separately rectifier; screw

Iin = linear ns = nanosecond SECT = sections list will be in upper case.
LK WASH = lockwasher nW = nanowatt SEMICON = semiconductor
LO = low; local oscillator OBD = order by description SHF = superhigh frequency
LOG = logarithmic taper OD = outside diameter SI = Silicon

log = logarithm(ic) OP AMPL = operational amplifier SL = slide
LPF = low pass filter OPT = option SNR = signal-to-noise ratio
LV = low voltage OSC = oscillator SPDT = single-pole, double­m = meter (distance) OX = oxide throw
mA = milliampere oz = ounce SPG = spring
MAX = maximum Ω = ohm SR = split ring Abbreviation Prefix Multiple
MΩ = megohm P = peak (used in parts SPST = single-pole. single- T tera 10
MEG = meg (106) (used in list) throw G giga 10

MET FLM = metal film modulation SST = stainless steel k kilo 10
MET OX = metal oxide PC = printed circuit STL = steel da deka 10
MF = medium frequency; PCM = pulse-code modulation; SQ = square d deci 10

MFR = manufacturer modulation T = timed (slow-blow fuse) µ micro 10
mg = milligram pF = picofarad TA = tantalum n nano 10
MHz = megahertz PH BRZ = phosphor bronze TC = temperature p pico 10
mH = millihenry PHL = Phillips compensating f femto 10
mho = mho PIN = positive-instrinsic- TD = time delay a atto 10
MIN = minimum negative TERM = terminal

parts list) replaceable SE = selenium All abbreviations in the parts

(used in parts list) OH = oval head SIL = silver

parts list) PAM = pulse-amplitude SSB = single sideband M mega 10

microfarad (used in pulse-count modulation SWR = standing-wave ratio c centi 10

parts list) PDM = pulse-duration SYNC = synchronize m milli 10

MULTIPLIERS

NOTE

-6

) (used in

12

9

6

3

-1

-2

-3

-6

-9

-12

-15

-18

9E-6-2

Model 5305B

A

Replaceable Parts

Table 9E-6-1. Replaceable Parts

Reference HP Part Qty Description Mfr Mfr Part Number
Designation Number Code

A1 05305-60005 1 BOARD ASSY, LOGIC 28480 05305-60005

A1C1 0160-4084 13 CAPACITOR-FXD .1UF +-20% 50WVDC CER 28480 0160-4084
A1C2 0160-4084 CAPACITOR-FXD .1UF +-20% 50WVDC CER 28480 0160-4084
A1C3 0180-1746 3 CAPACITOR-FXD 15UF +-10% 20VDC TA 56289 1500156X9020B2
A1C4 0150-0075 1 CAPACITOR-FXD 4700PF +100-0% 500WVDC CER 28480 0150-0075
A1C5 0160-3879 11 CAPACITOR-FXD .01UF +-20% 100WVDC CER 28480 0160-3879

A1C6 0160-3879 CAPACITOR-FXD .01UF +-20% 100WVDC CER 28480 0160-3879
A1C7 0160-3456 1 CAPACITOR-FXD 1000PF +-10% 1000WVDC CER 28480 0160-3456
A1C8 0160-4084 CAPACITOR-FXD .1UF +-20% 50WVDC CER 28480 0160-4084
A1C9 0180-1746 CAPACITOR-FXD 15UF +-10% 20VDC TA 56289 150D156X9020B2
A1C10 0180-1746 CAPACITOR-FXD 15UF +-10% 20VDC TA 56289 150D156X9020B2

A1C11 0180-0155 2 CAPACITOR-FXD 2.2UF +-20% 20VDC TA 56289 150D225X0020A2
A1C12 0160-3879 CAPACITOR-FXD .01UF +-20% 100WVDC CER 28480 0160-3879
A1C13 0180-0210 3 CAPACITOR-FXD 3.3UF +-20% 15VDC TA 56289 150D335X0015A2
A1C14 0180-1701 4 CAPACITOR-FXD 6.8UF +-20% 6VDC TA 56289 150D685X0006A2
A1C15* 0160-3873 2 CAPACITOR-FXD 4.7PF +-.5PF 200WVDC CER 28480 0160-3873
A1C15* 0160-3872 CAPACITOR-FXD 2.2PF +-.25PF 200WVDC CER 28480 0160-3872
A1C15* 0160-3874 CAPACITOR-FXD 10PF +-.5PF 200WVDC CER 28480 0160-3874

A1C16 0160-3879 CAPACITOR-FXD .01UF +-20% 100WVDC CER 28480 0160-3879
A1C17 0180-0490 3 CAPACITOR-FXD 68UF +-10% 6VDC TA 56289 196D686X9006KA1
A1C18 0180-0553 1 CAPACITOR-FXD 22UF +-20% 25VDC TA 28480 0180-0553
A1C19 0160-4084 CAPACITOR-FXD .1UF +-20% 50WVDC CER 28480 0160-4084
A1C20 0180-0210 CAPACITOR-FXD 3.3UF +-20% 15VDC TA 56289 150D335X0015A2

A1C21 0180-1702 2 CAPACITOR-FXD 180UF +-20% 6VDC TA 56289 150D187X0006R2
A1C22 0180-1702 CAPACITOR-FXD 180UF +-20% 6VDC TA 56289 150D187X0006R2
A1C23 0180-0210 CAPACITOR-FXD 3.3UF +-20% 15VDC TA 56289 150D335X0015A2
A1C24 0180-0490 CAPACITOR-FXD 68UF +-10% 6VDC TA 56289 196D686X9006KA1
A1C25 0180-1701 CAPACITOR-FXD 6.8UF +-20% 6VDC TA 56289 150D685X0006A2

A1C26 0180-0490 CAPACITOR-FXD 68UF +-10% 6VDC TA 56289 196D686X9006KA1
A1C27 0160-4084 CAPACITOR-FXD .1UF +-20% 50WVDC CER 28480 0160-4084
A1C28 0160-4084 CAPACITOR-FXD .1UF +-20% 50WVDC CER 28480 0160-4084
A1C29 0160-4084 CAPACITOR-FXD .1UF +-20% 50WVDC CER 28480 0160-4084
A1C30 0160-4084 CAPACITOR-FXD .1UF +-20% 50WVDC CER 28480 0160-4084

A1C31 0160-3879 CAPACITOR-FXD .01UF +-20% 100WVDC CER 28480 0160-3879
A1C32 0160-3879 CAPACITOR-FXD .01UF +-20% 100WVDC CER 28480 0160-3879
A1C33 0160-3879 CAPACITOR-FXD .01UF +-20% 100WVDC CER 28480 0160-3879
A1C34 0160-3879 CAPACITOR-FXD .01UF +-20% 100WVDC CER 28480 0160-3879
A1C35 0180-0098 1 CAPACITOR-FXD 100UF +-20% 20VDC TA 56289 150D107X0020S2

A1C36 0180-1701 CAPACITOR-FXD 6.8UF +-20% 6VDC TA 56289 150D685X0006A2
A1C37 0160-4084 CAPACITOR-FXD .1UF +-20% 50WVDC CER 28480 0160-4084
A1C38 0160-3879 CAPACITOR-FXD .01UF +-20% 100WVDC CER 28480 0160-3879
A1C39 0160-4084 CAPACITOR-FXD .1UF +-20% 50WVDC CER 28480 0160-4084
A1C40 0180-0374 1 CAPACITOR-FXD 10UF +-10% 20VDC TA 56289 150D106X9020B2

A1C41 0160-4084 CAPACITOR-FXD .1UF +-20% 50WVDC CER 28480 0160-4084
A1C42 0140-0178 1 CAPACITOR-FXD 560PF +-20% 300WVDC MICA 72136 DM15F561G0300WVICR
A1C43 0160-4084 CAPACITOR-FXD .1UF +-20% 50WVDC CER 28480 0160-4084
A1C44 0160-3879 CAPACITOR-FXD .01UF +-20% 100WVDC CER 28480 0160-3879
A1C45 0160-3879 CAPACITOR-FXD .01UF +-20% 100WVDC CER 28480 0160-3879

A1C46 0180-0155 CAPACITOR-FXD 2.2UF+-20% 20VDC TA 56289 150D225X0020A2
A1C47 0160-2204 1 CAPACITOR-FXD 100PF+-5% 300WVDC MICA 09023 RDM15F101J3C
A1C48 0180-1101 CAPACITOR-FXD 6.8UF+-20% 6VDC TA 56289 150D685X0006A2
A1C49 0160-4084 CAPACITOR-FXD .1UF +-20% 50WVDC CER 28480 0160-4084
A1C50 0180-0195 1 CAPACITOR-FXD .33UF+-20% 35VDC TA 56289 150D334X0035A2

A1CR1 1910-0016 4 DIODE-GE 60V 60NA 1US DO-7 28480 1910-0016
A1CR2 1901-0119 7 DIODE-SWITCHING 15V 50MA 750PS DO-7 28480 1901-0119
A1CR3 1902-0025 1 DIODE-ZNR 10V 5% DO-7 PD=.4W TC=+.06% 04713 SZ 10939-182
A1CR4 1901-0119 DIODE-SWITCHING 15V 50MA 750PS DO-7 28480 1901-0119
A1CR5 1901-0179 DIOOE-SWITCHING 15V 50MA 750PS DO-7 28480 1901-0179

A1CR6 1901-0040 8 DIODE-SWITCHING 30V 50MA 2NS DO-35 28480 1901-0040
A1CR7 1901-0179 DIODE-SWITCHING 15V 50MA 750PS DO-7 28480 1901-0119
A1CR8 1901-0040 DIODE-SWITCHING 30V 50MA 2NS DO-35 28480 1901-0040
A1CR9 1901-0535 5 DIODE-SCHOTTKY 28480 1901-0535
A1CR10 1910-0016 DIODE-GE 60V 60NA 1US DO-7 28480 1910-0016

A1CR11 1901-0535 DIODE-SCHOTTKY 28480 1901-0535
A1CR12 1901-0535 DIODE-SCHOTTKY 28480 1901-0535
A1CR13 1901-0535 DIODE-SCHOTTKY 28480 1901-0535
A1CR14 1901-0028 2 DIODE-PWR RECT 400V 750 MA DO-29 04713 SR1358-9
A1CR15 1901-0040 DIODE-SWITCHING 30V 50MA 2NS DO-35 28480 1901-0040

A1CR16 1901-0040 DIODE-SWITCHING 30V 50MA 2NS DO-35 28480 1901-0040
A1CR17 1901-0040 DIODE-SWITCHING 30V 50MA 2NS DO-35 28480 1901-0040
A1CR18 1901-0040 DIODE-SWITCHING 30V 50MA 2NS DO-35 28480 1901-0040
A1CR19 1901-0040 DlODE-SWITCHING 30V 50MA 2NS DO-35 28480 1901-0040

1CR20 1910-0016 DIODE-GE 60V 60NA 1US DO-7 28480 1910-0016

*FACTORY SELECTED PART

See introduction to this section for ordering information

9E-6-3

Model 5305B

p

A

Re

laceable Parts

Table 9E-6-1. Replaceable Parts (Cont'd)

Reference HP Part Qty Description Mfr Mfr Part Number
Designation Number Code

A1CR21 1901-0535 DIODE-SCHOTTKY 28480 1901-0535
A1CR22 1910-0016 DIODE-GE 60V 60NA 1US DO-7 28480 1910-0016
A1CR23 1901-0028 DIODE-PWR RECT 400V 750MA DO-29 04713 SR1358-9
A1CR24 1901-0460 1 DIODE- STABISTOR 15V 150MA DO-7 28480 1901-0460

A1J1 1251-4277 1 CONNECTOR 10-PIN F POST TYPE 28480 1251-4277

A1L1 9100-1633 3 COIL-MLD 68UH 5% Q=55 .155DX.375LG 24226 15/682
A1L2 9100-2256 1 COIL-FXD MOLDED RF CHOKE .56UH 10% 24226 10/560
A1L3 9100-1633 COIL-MLD 68UH 5% Q=55 .155DX.375LG 24226 15/682
A1L4 9100-1633 COIL-MLD 68UH 5% Q=55 .155DX.375LG 24226 15/682
A1L5 9100-3139 2 COIL-FXD NON-MOLDED RF CHOKE 75UH 15% 28480 9100-3139

A1L6 9100-3139 COIL-FXD NON-MOLDED RF CHOKE 75UH 15% 28480 9100-3139
A1L7 9100-0346 1 COIL-FXD MOLDED RF CHOKE .05UH 20% 28480 9100-0346

A1P1 1251-2756 1 CONNECTOR 50-PIN F MICRO RIBBON 71785 222-22-50-069

A1Q1 1855-0081 1 TRANSISTOR J-FET 2N5245 N-CHAN D-MODE SI 01295 2N5245
A1Q2 1853-0247 1 TRANSISTOR PNP SI PD=200MW FT=1.5GHZ 28480 1853-0247
A1Q3 1855-0386 1 TRANSISTOR J-FET 2N4392 N-CHAN D-MODE 04713 2N4392
A1Q4 1854-0071 5 TRANSISTOR NPN SI PD=300MW FT-200MHZ 28480 1854-0071
A1Q5 1853-0015 4 TRANSISTOR PNP SI PD=200MW FT=500MHZ 28480 1853-0015

A1Q6 1854-0634 1 TRANSISTOR NPN SI PD=1W FT=50MHZ 04713 MPS-UO1
A1Q7 1854-0071 TRANSISTOR NPN SI PD=300MW FT=200MHZ 28480 1854-0071
A1Q8 1853-0015 TRANSISTOR PNP SI PD=200MW FT=500MHZ 28480 1853-0015
A1Q9 1853-0015 TRANSISTOR PNP SI PD=200MW FT=500MHZ 28480 1853-0015
A1Q10 1853-0015 TRANSISTOR PNP SI PD=200MW FT=500MHZ 28480 1853-0015

A1Q11 1854-0009 4 TRANSISTOR NPN 2N709 SI TO-18 PD=300MW 2B480 1854-0009
A1Q12 1854-0009 TRANSISTOR NPN 2N709 SI TO-18 PD=300MW 28480 1854-0009
A1Q13 1854-0009 TRANSISTOR NPN 2N709 SI TO-18 PD=300MW 28480 1854-0009
A1Q14 1854-0071 TRANSISTOR NPN SI PD=300MW FT=200MHZ 28480 1854-0071
A1Q15 1853-0036 2 TRANSISTOR. PNP SI PD=310MW FT=250MHZ 04713 SPS-3612

A1Q16 1853-0036 TRANSISTOR. PNP SI PD=310MW FT=250MHZ 04713 SPS-3612
A1Q17 1854-0071 TRANSISTOR NPN SI PD=300MW FT=200MHZ 28480 1854-0071
A1Q18 1854-0009 TRANSISTOR NPN 2N709 SI TO-18 PD=300MW 28480 1854-0009
A1Q19 1854-0071 TRANSISTOR NPN SI PD=300MW FT=200MHZ 28480 1854-0071

A1R1 2100-3434 1 RESISTOR-VAR CONTROL CC 50K 10% LIN 01121 70M4N048P503U
A1R2 0698-8339 1 RESISTOR 82K 5% .125W CC TC=-466/[phone] BB8235
A1R3 0698-7964 2 RESISTOR 100K 5% .125W CC TC=-466/[phone] BB1045
A1R4 0698-5176 RESISTOR 510 5% .125W CC TC=-330/[phone] BB5115
A1R5 0698-7097 1 RESISTOR 1M 5% .125W CC TC=-600/[phone] BB1055
A1R6 0698-5564 1 RESISTOR 240 5% .125W CC TC=-300/[phone] BB2415
A1R7 0683-2015 4 RESISTOR 200 5% .25W FC TC=-400/[phone] CB2015
A1R8 0698-5175 6 RESISTOR 360 5% .125W CC TC=-330/[phone] BB3615
A1R9 0683-2015 RESISTOR 200 5% .25W FC TC=-400/[phone] CB2015
A1R10 0698-7964 RESISTOR 100K 5%.125W CC TC=-466/[phone] BB1045
A1R11 0698-5176 RESISTOR 510 5%.125W CC TC=-330/[phone] BB5115
A1R12 0698-5180 6 RESISTOR 2K 5%.125W CC TC=-350/[phone] BB2025
A1R13 0698-5185 1 RESISTOR 15K 5%.125W CC TC=-466/[phone] BB1535
A1R14 0698-5175 RESISTOR 360 5% .125W CC TC=-330/[phone] BB3615
A1R15 0698-5180 RESISTOR 2K 5% .125W CC TC=-350/[phone] BB2025
A1R16 0698-5180 RESISTOR 2K 5%.125W CC TC=-350/[phone] BB2026
A1R17 0698-5180 RESISTOR 2K 5% .125W CC TC=-350/[phone] BB2025
A1R18 2100-1738 3 RESISTOR-TRMR 10K 10% C TOP-ADJ 1-TURN 30983 ET50W103
A1R19 0683-1035 13 RESISTOR 10K 5% .25W FC TC=-400/[phone] CB1035
A1R20 0683-3025 1 RESISTOR 3K 5% .25W FC TC=-400/[phone] CB3025
A1R21 0675-1021 RESISTOR 1K 10% .125W CC TC=-330/[phone] BB1021
A1R22 0698-5176 RESISTOR 510 5% .125W CC TC=-330/[phone] BB5115
A1R23 0698-5175 RESISTOR 360 5% .125W CC TC=-330/[phone] BB3615
A1R24 0698-5176 RESISTOR 510 5% .125W CC TC=-330/[phone] BB5115
A1R25 0698-8356 2 RESISTOR 56K 5% .125W CC TC=-466/[phone] BB5635
A1R26 0698-5426 4 RESISTOR 10K 10% .125W CC TC=-350/[phone] BB1031
A1R27 0698-5160 RESISTOR 2K 5% .125W CC TC=-350/[phone] BB2025
A1R28* 0698-5176 4 RESISTOR 510 5% .125W CC TC=-330/[phone] BB5115
A1R28* 0675-1021 1 RESISTOR 1K 10% .125w CC TC=-330/[phone] BB1021
A1R28* 0698-6241 1 RESISTOR 750 5% .125W CC TC=-330/[phone] BB7515
A1R28* 0698-5103 RESISTOR 430 5% .125W CC TC=-330/[phone] BB4315
A1R29 0683-1035 RESISTOR 10K 5% .25W FC TC=-400/[phone] BB1035
A1R30 0698-5175 RESISTOR 360 5% .125W CC TC=-330/[phone] BB3615
A1R31 1810-0171 1 NETWORK -RES 6-PIN-SIP .15-PIN-SPCG 28480 1810-0171
A1R32 0698-8356 RESISTOR 56K 5% .125W CC TC=-466/[phone] BB5635
A1R33 0698-5175 RESISTOR 360 5% .125W CC TC=-330/[phone] BB3615
A1R34 0698-5175 RESISTOR 360 5% .125W CC TC=-330/[phone] BB3615
A1R35 0683-1045 3 RESISTOR 100K 5% .25W FC TC=-400/[phone] CB1045
A1R36 0683-5635 1 RESISTOR 56K 5% .25W FC TC=-400/[phone] CB5635
A1R37 0683-3915 1 RESISTOR 390 5% .25W FC TC=-400/[phone] CB3915
A1R38 0698-5180 RESISTOR 2K 5% .125W CC TC=-350/[phone] BB2025

A1R39 0683-1035 RESISTOR 10K 5% .25W FC TC=-400/[phone] CB1035
A1R40 0683-1035 RESISTOR 10K 5% .25W FC TC=-400/[phone] CB1035
A1R41 0683-3035 1 RESISTOR 30K 5% .25W FC TC=-400/[phone] CB3035
A1R42 0683-6205 1 RESISTOR 62 .25W FC TC=-400/[phone] CB6205
A1R43 0683-1025 8 RESISTOR 1K 5% .25W FC TC=-400/[phone] CB1025
A1R44 2100-2030 1 RESISTOR -TRMR 20K 10% C TOP-ADJ 1-TURN 30983 ET50W203
A1R45 0683-1025 RESISTOR 1K 5% .25W FC TC=-400/[phone] CB1025

1R46 0683-1025 RESISTOR 1K 5% .25W FC TC=-400/[phone] CB1025

*FACTORY SELECTED PART

See introduction to this section for ordering information

9E-6-4

Model 5305B

p

A

Re

laceable Parts

Table 9E-6-1. Replaceable Parts (Cont'd)

Reference HP Part Qty Description Mfr Mfr Part Number
Designation Number Code

A1R47 1810-0041 2 NETWORK-RES 9-PIN-SIP .15-PIN-SPCG 28480 1810-0041
A1R48 0683-5115 6 RESISTOR 510 5% .25W FC TC=-400/[phone] C85115
A1R49 0683-1025 RESISTOR 1K 5% .25W FC TC=-400/[phone] C81025
A1R50 0683-1025 RESISTOR 1K 5% .25W FC TC=-400/[phone] C81025
A1R51 0683-1025 RESISTOR 1K 5% .25W FC TC=-400/[phone] C81025

A1R52 1810-0041 NETWORK-RES 9-PIN-SIP .15-PIN-SPCG 28480 1810-0041
A1R53 0683-3015 1 RESISTOR 300 5% .25W FC TC=-400/[phone] C83015
A1R54 0683-2015 RESISTOR 200 5% .25w FC TC=-400/[phone] C82015
A1R55 1810-0139 1 NETWORK-RES 5-PIN-SIP .15-PIN_-SPCG 28480 1810-0139
A1R56 0683-5115 RESISTOR 510 5% .25W FC TC=-400/[phone] C85115

A1R57 0683-1035 RESISTOR 10K 5% .25W FC TC=-400/[phone] CB1035
A1R58 0683-1035 RESISTOR 10K 5% .25W FC TC=-400/[phone] CB1035
A1R59 0683-2245 1 RESISTOR 220K 5% .25W FC TC=-800/[phone] CB2245
A1R60 0683-7525 1 RESISTOR 7.5K 5% .25W FC TC=-400/[phone] CB7525
A1R61 0683-1045 RESISTOR 100K 5% .25W FC TC=-400/[phone] C81045

A1R62 0683-3345 2 RESISTOR 330K 5% .25W FC TC=-800/[phone] C83345
A1R63 0683-6215 1 RESISTOR 620 5% .25W FC TC=-400/[phone] C86215
A1R64 0683-1035 RESISTOR 10K 5% .25W FC TC=-400/[phone] CB1035
A1R65 0683-1025 RESISTOR 1K 5% .25W FC TC=-400/[phone] CB1025
A1R66 0683-2015 RESISTOR 200 5% .25W FC TC=-400/[phone] C82015

A1R67 0683-1035 RESISTOR 10K 5% .25W FC TC=-400/[phone] C81035
A1R68 0683-5115 RESISTOR 510 5% .25W FC TC=-400/[phone] C85115
A1R69 0683-5115 RESISTOR 510 5% .25W FC TC=-400/[phone] C85115
A1R70 0683-1035 RESISTOR 10K 5% .25W FC TC=-400/[phone] C81035
A1R71 2100-1738 RESISTOR-TRMR 10K 10% C TOP-ADJ 1-TURN 30983 ET50W103

A1R72 0683-5115 RESISTOR 510 5% .25W FC TC=-400/[phone] C85115
A1R73 0683-5115 RESISTOR 510 5% .25W FC TC=-400/[phone] C85115
A1R74 0683-1035 RESISTOR 10K 5% .25W FC TC=-400/[phone] CB1035
A1R75 0683-5105 1 RESISTOR 51 5% .25W FC TC=-400/[phone] CB5105
A1R76 0683-5125 3 RESISTOR 5.1K 5% .25W FC TC=-400/[phone] C85125

A1R77 0683-1045 RESISTOR 100K 5% .25W FC TC=-400/[phone] C81045
A1R78 0683-5125 RESISTOR 5.IK 5% .25W FC TC=-400/[phone] C85125
A1R79 2100-1984 1 RESISTOR-TRMR 100 10% C TOP-ADJ 1-TURN 30983 ET50WI01
A1R80 NOT ASSIGNED
A1R81 0683-8235 1 RESISTOR 82K 5% .25W FC TC=-400/[phone] C88235
A1R82 0683-9135 1 RESISTOR 91K 5%.25W FC TC=-400/[phone] C89135
A1R83 0683-2715 1 RESISTOR 270 5% .25W FC TC=-400/[phone] CB2715
A1R84 0683-3345 RESISTOR 330K 5% .25W FC TC=-800/[phone] C83345
A1R85 0683-1025 RESISTOR 1K 5% .25W FC TC=-400/[phone] CB1025
A1R86 0683-4305 1 RESISTOR 43 5% .25W FC TC=-400/[phone] CB4305
A1R87 0683-1035 RESISTOR 10K 5% .25W FC TC=-400/[phone] C81035

A1R88 0683-3615 1 RESISTOR 360 5% .25W FC TC=-400/[phone] C83615
A1R89 0683-6245 1 RESISTOR 620K 5% .25W FC TC=-800/[phone] C86245
A1R90 0683-6225 1 RESISTOR 6.2K 5% .25w FC TC=-400/[phone] C86225
A1R91 0683-5125 RESISTOR 5.1K 5% .25W FC TC=-400/[phone] C85125
A1R92 0683-1035 RESISTOR 10K 5% .25W FC TC=-400/[phone] C81035

A1R93 0683-1035 RESISTOR 10K 5% .25W FC TC=-400/[phone] C81035
A1R94 0683-1215 RESISTOR 120 5% .25W 01121 C81215
A1S1 3100-3373 1 SWITCH-RTRY 4P4T-NS .562-CTR-SPCG 28480 3100-3373
A1S2 3100-3306 1 SWITCH-RTRY 3P6T-NS .562 IN CTR SPCG 28480 3100-3306

A1TP1 0360-0124 10 TERMINAL-STUD SGL-PIN PRESS-MTG 28480 0360-0124
A1TP2 0360-0124 TERMINAL-STUD SGL-PIN PRESS-MTG 28480 0360-0124
A1TP3 0360-0124 TERMINAL-STUD SGL-PIN PRESS-MTG 28480 0360-0124
A1TP4 0360-0124 TERMINAL-STUD SGL-PIN PRESS-MTG 28480 0360-0124
A1TP5 0360-0124 TERMINAL-STUD SGL-PIN PRESS-MTG 28480 0360-0124

A1TP6 0360-0124 TERMINAL-STUD SGL-PIN PRESS-MTG 28480 0360-0124
A1TP7 0360-0124 TERMINAL-STUD SGL-PIN PRESS-MTG 28480 0360-0124
A1TP8 0360-0124 TERMINAL-STUD SGL-PIN PRESS-MTG 28480 0360-0124
A1TP9 0360-0124 TERMINAL-STUD SGL-PIN PRESS-MTG 28480 0360-0124
A1TP10 0360-0124 TERMINAL-STUD SGL-PIN PRESS-MTG 28480 0360-0124

A1U1 1826-0275 1 IC 78L12AC V RGL TR 04713 MC78L12CP
A1U2 1826-0274 1 IC 78L15AC V RGL TR 04713 MC78L15CP
A1U3 1820-0621 1 IC-DIGITAL SN7438N TTL QUAD 2 NAND 01295 SN7438N
A1U4 1820-0910 1 IC-DIGITAL SN74LS83AN TTL LS BIN 01295 SN74LS83N
A1U5 1820-1166 1 IC-DIGITAL DM85L51N TTL QUAD 27014 DM85L51N

A1U6 1820-1224 1 IC-DIGITAL ECL TPL MC10216P 2 LINE RCVR 04713 MC10216P
A1U7 1820-0493 2 IC LM 307 OP AMP 27014 LM307N
A1U8 1826-0139 1 IC MC 1458 OP AMP 04713 MC1458P1
A1U9 1820-0681 1 IC-DIGITAL SN74S00N TTL SQUAD 2 NAND 01295 SN74S00N
A1U10 1820-1206 1 IC-DIGITAL SN74LS27N TTL LS TPL 3 NOR 01295 SN74LS27N

A1U11 1820-1443 1 IC-DIG ITAL SN74LS293N TTL LS BIN 01295 SN74LS293N
A1U12 1820-0804 1 IC-DIGITAL MC10106P ECL TPL NOR 04713 MC10106P
A1U13 1820-0803 1 IC-DIGITAL MC10105P ECL TPL OR-NOR 04713 MC10105P
A1U14 1820-1383 1 IC-DIGITAL MC10138L ECL BCD 04713 MC10138L

1U15 1826-0174 2 IC MC 3302 COMPARATOR 28480 1826-0174

See introduction to this section for ordering information

9E-6-5

Model 5305B

p

A

Re

laceable Parts

Table 9E-6-1. Replaceable Parts (Cont'd)

Reference HP Part Qty Description Mfr Mfr Part Number
Designation Number Code

A1U16 1826-0174 IC MC 3302 COMPARATOR 28480 1826-0174
A1U17 1820-0817 1 IC-DIGITAL MC10131P ECL DUAL D-M/S 04713 MC10131P
A1U18 1820-0584 1 IC-DIGITAL DM74L02N TTL L QUAD 2 NOR 27014 DM74L02N
A1U19 1820-1442 3 IC-DIGITAL SN74LS290N TTL LS DECD 01295 SN74LS290N
A1U20 1820-1442 IC-DIGITAL SN74LS290N TTL LS DECD 01295 SN74LS290N

A1U21 1820-1442 IC-DIGITAL SN74LS290N TTL LS DECD 01295 SN74LS290N
A1U22 1820-0630 1 IC-DIGITAL MC4044P TTL 04713 MC4O44P
A1U23 1820-0493 IC LM 307 OP AMP 27014 LM307N
A1U24 1820-1307 1 IC-DIGITAL SN74S132N TTL S QUAD 2 NAND 01295 SN74S132N
A1U25 1820-1225 1 IC-DIGITAL MC10231P ECL DUAL D-M/S 04713 MC10231P

A1U26 1820-0712 1 lC:BINARY 28480 1820-0712
A1U27 1826-0147 1 IC 7812C V RGLTR 07263 7812UC
A1U28 1826-0122 1 IC 7805C V RGLTR 07263 7805UC

A1 MISCELLANEOUS

0380-0342 4 STANDOFF-RVT-ON .125LG 6-32THD .250D BRS 28480 0380-0342
0905-0479 1 GASKET 28480 0905-0479
05354-00009 5 GROUND SPRING, GOLD 28480 05354-00009

A2 05305-60006 1 1.3 GHZ BOARD ASSEMBLY 28480 05305-60006
A2C1 0160-3878 10 CAPACITOR-FXD 1000PF +-20% 100WVDC CER 28480 0160-3878

A2C2 0160-3878 CAPACITOR-FXD 1000PF +-20% 100WVDC CER 28480 0160-3878
A2C3 0160-3878 CAPACITOR-FXD 1000PF +-20% 100WVDC CER 28480 0160-3878
A2C4 0160-0570 3 CAPACITOR-FXD 220PF +-20% 100WVDC CER 28480 0160-0570
A2C5 0160-3878 CAPACITOR-FXD 1000PF +-20% 100WVDC CER 28480 0160-3878

A2C6 0160-0570 CAPACITOR-FXD 220PF +-20% 100WVDC CER 28480 0160-0570
A2C7 0160-3878 CAPACITOR-FXD 1000PF +-20% 100WVDC CER 28480 0160-3878
A2C8 0160-0570 CAPACITOR-FXD 220PF +-20% 100WVDC CER 28480 0160-0570
A2C9 0160-3878 CAPACITOR-FXD 1000PF +-20% 100WVDC CER 28480 0160-3878
A2C10 0160-3876 1 CAPACITOR-FXD 47PF +-20% 200WVDC CER 28480 0160-38710

A2C11 0160-2599 1 CAPACITOR-FXD 680PF +-10% 200WVDC CER 28480 0160-2599
A2C12 0160-3878 CAPACITOR-FXD 1000PF +-20% 100WVDC CER 28480 0160-3878
A2C13 0160-3878 CAPACITDR-FXD 1000PF +-20% 100WVDC CER 28480 0160-3878
A2C14 0160-3873 CAPACITOR-FXD 4.7PF +-.5PF 200WVDC CER 28480 0160-3873
A2C15 0160-3878 CAPACITOR-FXD 1000PF +-20% 100WVDC CER 28480 0160-3878

A2C16 0160-3878 CAPACITOR-FXD 1000PF +-20% 100WVDC CER 28480 0160-3878
A2C17 0160-4415 1 CAPACITOR-FXD .16UF +5-0% 200WVDC POLYE 28480 0160-4415
A2C18 0160-4248 1 CAPACITOR-FXD 1000PF +-10% 50WVDC CER 26654 38X050S102K (D)

A2CR1 1902-0032 2 DIODE-ZNR 5.49V 5% DO-7 PD=.4W TC=+.009% 04713 SZ 10939-107
A2CR2 1901-0050 2 DIODE-SWITCHING 80V 200MA 2NS DO-7 28480 1901-0050
A2CR3 1902-3171 1 DIODE-ZNR 11V 5% DO-7 PD=.4W TC=+.062% 04713 SZ 10939-194
A2CR4 1901-0050 DIODE-SWITCHING 80V 200MA 2NS DO-7 28480 1901-0050
A2CR5 1901-0639 4 DIODE-PIN 110V 28480 1901-0639

A2CR6 1901-0639 DIODE-PIN 110V 28480 1901-0639
A2CR7 1902-0032 DIODE-ZNR 5.49V 5% DO-7 PD=.4W TC=+.009% 04713 SZ 10939-107
A2CR8 1901-0639 DIODE-PIN 110V 28480 1901-0639
A2CR9 1901-0639 UIODE-PIN 11OV 28480 1901-0639
A2CR10 1901-0179 DIODE-SWITCHING 15V 50MA 750PS DO-7 28480 1901-0179

A2CR11 1901-0179 DIOOE-SWITCHING 15V 50MA 750PS DO-7 28480 1901-0179
A2CR12 1901-0179 DIODE-SWITCHING 15V 50MA 750PS DO-7 28480 1901-0179
A2CR13 1901-0040 DIODE-SWITCHING 30V 50MA 2NS DO-35 28480 1901-0040

A211 9140-0144 2 COIL-FXD MOLDED RF CHOKE 4.7UH 10% 24226 10/471
A2L2 9100-2265 1 COIL-MLD 10UH 10% Q=60 .095DX.25LG 24226 10/102
A2L3 9140-0144 COIL-FXD MOLDED RF CHOKE 4.7UH 10% 24226 10/471

A2P1 1251-4249 10 CONTACT-CONN U/W-POST-TYPE DPSLDR 28480 1251-4249

A2R1 0698-6648 4 RESISTOR 620 5% .125W CC TC=-330/[phone] BB6215
A2R2 0698-5426 RESISTOR 10K 10% .125W CC TC=-350/[phone] BB1031
A2R3 0698-6648 RESISTOR 620 5% .125W CC TC=-330/[phone] BB6215
A2R4 0698-7102 1 RESISTOR 5.1K 5% .125W CC TC=-350/[phone] BB5125
A2R5 0698-5426 RESISTOR 10K 10% .125W CC TC=-350/[phone] BB1031

A2R6 0698-6648 RESISTOR 620 5% .125W CC TC=-330/[phone] BB6215
A2R7 0698-6648 RESISTOR 620 5% .125W CC TC=-330/[phone] BB6215
A2R8 0683-2265 1 RESISTOR 22M 5% .25W FC TC=-900/[phone] CB2265
A2R9 0698-3378 2 RESISTOR 51 5% .125W CC TC=-270/[phone] BB5105
A2R10 0698-6984 1 RESISTOR 470 5% .125W CC TC=-330/[phone] BB4715

A2R11 0698-7243 1 RESISTOR 1.96K 1% .05W F TC=0+-100 24546 C3-1/8-T0-1961-G
A2R12 0698-5426 RESISTOR 10K 10% .125W CC TC=-350/[phone] BB1031
A2R13 2100-1738 RESISTOR-TRMR 10K 10% C TOP-ADJ 1-TURN 30983 ET50W103
A2R14 0698-7288 4 RESISTOR 147K 1% .05W F TC=0+-100 24546 C3-1/8-T0-1473-G
A2R15 0698-7288 RESISTOR 147K 1% .05W F TC=0+-100 24546 C3-1/8-T0-1473-G

A2R16 0698-7288 RESISTOR 147K 1% .05W F TC=0+-100 24546 C3-1/8-T0-1473-G
A2R17 0698-7288 RESISTOR 147K 1% .05W F TC=0+-100 24546 C3-1/8-T0-1473-G
A2R18 0698-5174 1 RESISTOR 200 5% .125W CC TC=-330/[phone] BB2015
A2R19 0698-5177 1 RESISTOR 820 5% .125W CC TC=-330/[phone] BB8215

2R20 0683-9105 1 RESISTOR 91 5%.25W FC TC=-400/+500 01121 CB9105

See introduction to this section for ordering information

9E-6-6

p

Model 5305B

Re

laceable Parts

Table 9E-6-1. Replaceable Parts (Cont'd)

Reference HP Part Qty Description Mfr Mfr Part Number
DesignatIon Number Code

A2R21 0698-4132 1 RESISTOR 62 5% .125W CC TC=-270/[phone]
A2R22 2100-1986 1 RESISTOR-TRMR 1K 10% C TOP-ADJ 1-TURN 30983 ET50W102
A2R23 0698-3442 1 RESISTOR 237 1% .125W F TC-0+-100 16299 C4-1/8-T0-237R-F
A2R24 0698-3378 RESISTOR 51 5% .125W CC TC=-270/[phone] BB5105
A2R25 0811-3468 RESISTOR 240 1% 07088 KP50
A2U1 1820-0223 1 IC LM 301A OP AMP 27014 LM301AH
A2U2 5088-7017 1 1.3 GHZ AMPLIFIER 28480 5088-7017
A2U3 1820-1695 1 IC-DIGITAL 28480 1820-1695
A2U4 1820-1694 1 IC-DIGITAL 28480 1820-1694

A2W1 05305-60207 1 1.3 GHZ CABLE 28480 05305-60207
1250-0821 1 CONNECTOR-RF SMC FEM UNMTD 24931 37P102-1
1250-0857 1 FERRULE CLAMP:RF CONNECTOR 77068 30994-4
05255-2010 1 SLEEVE, COAX 28480 05255-2010

A2 MISCELLANEOUS

05305-00010 3 CLAMP, GRINDING 28480 05305-00010
05305-20107 1 HOUSING, AMPLIFIER 28480 05305-20107

CHASSIS PARTS

F1 2110-0301 2 FUSE .125A 125V FAST-BLO .281X.093 75915 275,125

J1 1250-0186 1 CONNECTOR-RF BNC FEM SGL HOLE FR 90949 31-221-1024
05305-20104 1 HOLDER, FUSE 28480 05305-20104
05305-60205 1 CONNECTOR ASSEMBLY, BNC 28480 05305-60205
05305-60206 1 CONNECTOR ASSEMBLY, SMC 28480 05305-60206
J2 5060-0467 1 MALE PROBE, POWER 28480 5060-0467

MISCELLANEOUS PARTS

0370-1099 3 KNOB-BASE-PTR.5 IN JGK SGI-DECAL 28480 0370-1099
0510-0076 2 NUT-SHMET 6-32-THD .63-WD STL 78553 C8599-632-24B
0590-0038 1 NUT-HEX-DBL-CHAM 1/2-32-THD .094-THK 28480 0590-0038
1460-1311 1 SPRING-LEAF .25-W .58-LG BE CU 28480 1460-1311
1460-1312 1 SPRING-EXT.25-W .58-LG BE CU 28480 1460-1312

2950-0043 5 NUT-HEX-DBL-CHAM 3/8-32-THD .094-THK 73743 2X 28200
9220-1762 1 DUST COVER 28480 9220-1762
5040-7032 1 FOOT, REAR 28480 5040-7032
05300-00006 2 CLIP, RFI 28480 05300-00006
05300-20010 1 CASE 28480 05300-20010

05300-40003 4 SUPPORT, BOARD 28480 05300-40003
05300-40004 4 GUIDE, SLIDE 28480 05300-40004
05301-20005 1 STAND, TILT 28480 05301-20005
05301-40001 1 FOOT 28480 05301-40001
05305-00005 1 PANEL, FRONT 28480 05305-00005

05305-00006 1 PANEL, REAR 28480 05305-00006
05305-00007 1 BRACKET, FRONT 28480 05305-00007
05305-00008 1 COVER, HOUSING 28480 05305-00008
05305-00009 1 SHIELD, AMPLIFIER 28480 05305-00009
05305-00011 1 BRACKET, 80 MHZ 28480 05305-00011

05305-20105 1 INSULATOR 28480 05305-20105
05354-00009 GROUND SPRING, GOLD 28480 05354-00009

See introduction to this section for ordering information

9E-6-7

Model 5305B

t

r

Replaceable Parts

Figure 6-1. Details of Input Connector J1 and Fuse Mounting

Table 9E-6-2. Manufacturers Code Lis

Mfr No. Manufacturer Name Address Zip Code

01121 Allen-Bradley Co Milwaukee, WI 53212
01295 Texas Instr Inc Semicond Cmpnt Div Dallas, TX 75231
04713 Motorola Semiconductor Products Phoenix, AZ 85008
07263 Fairchild Semiconductor Div Mountain View, CA 94040
09023 Cornell-Dubilier Elek Div Fed Pac Sanford, NC 27330
16299 Corning Gl Wk Elec Cmpnt Div Raleigh, NC 27604
24226 Gowanda Electronics Corp Gowanda, NY 14070
24546 Corning Glass Works (Bradford) Bradford, PA 16701
24931 Speciality Connector Co Inc Indianapolis, IN 46227
26654 Varadyne Inc Santa Monica, CA 90403
27014 National Semiconductor Corp San ta Clara, CA 95051
28480 Hewlett-Packard Co Corporate HQ Palo Alto, CA 94304
30983 Mepco/Electra Corp San Diego, CA 92121
56289 Sprague Electric Co North Adams, MA 01247
71785 TRW Elek Components Cinch Div Elk Grove Village, IL 60007
72136 Electro Motive Corp Sub IEC Willimantic, CT 06226
73743 Fischer Special Mfg Co Cincinnati, OH 45206
75915 Littlefuse Inc Des Plaines, IL 60016
77068 Bendix Corp Electrodynamics Div North Hollywood, CA 91605
78553 Tinnerman Products Inc Cleveland, OH 44129
9D949 Amphenol Sales Div of Bunke

-Ramo Hazelwood, MO 63042

9E-6-8

g

SECTION IX E

g

g

5305B 1300 MHz COUNTER

SUBSECTION VII

MANUAL CHANGES

Manual Chan

Model 5305B

es and Options

9E-7-1. MANUAL CHANGES

9E-7-2. Section IX E applies directly to model 5305B
1300 MHz Counters havin

Serial Prefix number 1616A.

9E-7-3. NEWER INSTRUMENTS

9E-7-4. As changes are made, newer instruments may
have serial number prefixes not listed in Section IX E. The
manuals for these instruments will be sup plied with
"Manual Changes" sheets containing the required
information; replace
the affected pages with the replacement "manual changes"
pages. Contact the nearest Hewlett-Packard Sales and
Service Office for information if these pa

es are missing.

9E-7-1

g

SECTION IX E

g

g

5305B 1100 MHz COUNTER

SUBSECTION VIII

CIRCUIT DIAGRAMS

Model 5305B

Circuit Dia

rams

9E-8-1. INTRODUCTION

9E-8-2. This subsection of the manual contains the
followin

a. A signal list that gives the signal name and con-

b. Signal waveforms at key points in the input

PIN
NO.

information:

nector pin number of each signal that intercon­nects with the mainframe (see Table 9E-8-1).

amplifiers and clock circuits.

Table 9E-8-1. Counter Signal List

SIGNAL NAME DESCRIPTION

1 +5V Circuit operating voltages.
2 -5V
3 -17V

4 COMMON RETURN Common power and signal return line.

Signal to be countend in the mainframe.
5 F1 Goes low when the mainframe counter reaches 9% full-scale.
6 "9" Tied to pin 14.

7 F2 Time Base Clock 10 MHz or 10 MHz ÷16.

8 INHIBIT High during the measurement cycle, low during the display cycle.

c. Component location views of the printed-circuit

boards.

d. Schematic diagrams of the counter

9E-8-3. Use the information in this subsection in con­junction with the information provided in Subsection V,
Maintenance, while troubleshootin

.

the counter.

Low signal forces the main gate flip-flop in the mainframe
9 OPEN to the open position.

Low signal forces the main gate flip-flop in the mainframe
10 CLOSE to the closed position.

11 LOG Logarithmic pulse tram from time base triggers main gate flip­12 NC flop on rising edge.

Inverted log pulses while main gate in mainframe is open
13 EXPONENT indicates number of auto-ranging steps.

Low signal enables overflow and storage.
14 OVERFLOW

High signal resets all registers.
15 RESET

10 MHz reference signal from mainframe crystal oscillator.
16 CLOCK

Low signal enables closing of the main gate in the mainframe
17 MAX TIME on next log pulse. Rising edge initiates display cycle.

Output from the time base decade that is selected by the
18 TIME BASE OUTPUT time base select code on pins 22, 23, and 24.

9E-8-1

Model 5305B

g

he d

Circuit Dia

rams

Table 9E-8-1. Counter Signal List (Continued)

PIN NO. SIGNAL NAME DESCRIPTION

19 PRINT

20 TRANSFER

21 1 MHz TIME BASE INPUT

22 TIME BASE SELECT A
23 TIME BASE SELECT B
24 TIME BASE SELECT C

25 +22 V

26 +17 V

27 Hz

28 M

29 S

30 K

31 u

32 MAN RES

33 DP1

34 DP2

35 NC

36 DIGIT ADDRESS X
37 DIGIT SELECT X
38 DIGIT ADDRESS Y

39 DIGIT SELECT Y
40 DIGIT ADDRESS Z
41 DIGIT SELECT Z

Low signal provides print command to rear panel connector on

mainframe.

Low signal transfers data to display. High signal stores data.

Time base select code A, B, and C determines the time base

frequency at the time base output, pin 18.

Full wave rectified voltage from the power transformer secondary.
Provides power to charge the battery pack. If no battery pack is
used, pin 25 is connected via the plug-on to pin 50 (DC-IN).

Pins 27 through 31 provide the drive to the annunciator lights
on the front panel. A low signal lights the corresponding
indicator.

Low signal from front panel pushbutton switch or rear panel input
clears the system to zero.
Low signal activates decimal point 1.
Low signal activates decimal point 2.

Digit address code X, Y, Z from the display scanner
indicates which data digit is being displayed.

Digit select code X, Y, Z is the code that selects the mainframe counter
digit that is to be displayed. If the mainframe counter is displayed
directly, the corresponding lines of the digit address code and the digit
select code are connected together.

42 DATA "D"
43 DATA "C"'

44 DATA "B"
45 DATA "A"

46 DP3

47 DP4

48 DP5

49 COMMON RETURN

50 DC IN

9E-8-2

ata code A, B, C, D represents the digit to be displayed in

T
binary coded decimal form. Data lines can carry the mainframe
counter information to the plug-on as well as to the display or can
bypass the counter and bring plug-on data to the display.

Low signal activates decimal point 3.

Low signal activates decimal point 4.

Low signal activates decimal point 5.

Common power and signal return line.

DC Power to power supply from battery pack or from 22 volt
input power at pin 25.

g

c

g

Part of Figure 8-1. Channel B and Frequency Multiplier Circuits, Schematic Diagram

Input Signal: 9 kHz at 1V rms
Oscilloscope: HP 180A/1801A/1821A with 10:1 probe

Oscilloscope Settings: DISPLAY: ALT
(Unless otherwise stated) POLARITY: +

Coupling: A.C.
TIME/DIV: .1 ms

e

Model 5305B

Schematic Dia

rams

d

1. .1V /DIV

2. .01V/DIV

g

h

5. .05V/DIV

6. .2V/DIV

f

Appears as a sine wave
with small input si

3. .02V/DIV

4. .05V/DIV

nal

9E-8-3

Model 5305B

g

Schematic Dia

rams

Part of Figure 8-1. Channel B and Frequency Multiplier Circuits, Schematic Diagram (Cont'd)

9E-8-4

NOTES

1. REFERENCE DESIGNATIONS WITHIN THIS
ASSEMBLY ARE ABBREVIATED. ADD
ASSEMBLY NUMBER TO ABBREVIATION FOR
COMPLETE DESCRIPTION.

2. UNLESS OTHERWISE INDICATED:

RESISTANCE IN OHMS;
CAPACITANCE IN PICOFARADS
INDUCTANCE IN MICROHENRIES

3. +17VB -5VA AND +5VB IS SWITCHED

FROM A1S1

A1 TABLE OF ACTIVE ELEMENTS

Ref. Desig. HP Part No. Mfr or Industry Part No.

CR1, 10, 16, 20, 22 1910-0016
CR2, 4, 5, 7 1901-0179
CR3 1902-0025 SZ 10939-182
CR6, 8, 15, 16, 17, 1901-0040
18, 19 1901-0040
CR9, 11, 12, 13, 21 1901-0535
CR14, 23 1901-0028 SR 1358-9
CR24 1901-0460
Q1 1855-0081 2N5245
Q2 1853-0247
Q3 1855-0386 2N4392
Q4, 7, 14, 17, 19 1854-0071
Q5, 8, 9, 10 1853-0015
Q6 1854-0634 MPS-U01
Q11, 12, 13, 18 1854-0009
Q15, Q16 1853-0036 SPS-3612
U1 1826-0275 MC78L12CP
U2 1826-0274 MC78L15CP
U3 1820-0621 SN7438N
U4 1820-0910 SN74LS83N
U5 1820-1166 DM85L51N
U6 1820-1224 MC10216P
U7, 23 1820-0493 LM307N
U8 1826-0139 MC1458P1
U9 1820-0681 SN74S00N
U10 1820-1206 SN74LS27N
U11 1820-1443 SN74LS293N
U12 1820-0804 MC10106P
U13 1820-0803 MC10105P
U14 1820-1383 MC10138L
U15, 16 1826-0174
U17 1820-0817 MC10131P
U18 1820-0584 DM74L02N
U19, 20, 21 1820-1442 SN74LS290N
U22 1820-0630 MC4044P
U24 1820-1307 SN74S132N
U25 1820-1225 MC10231P
U26 1820-0712
U27 1820-0147 7812UC
U28 1826-0122 7805UC

N

Model 5305B

g

Schematic Dia

rams

Part of Figure 8-2. Channel A and Logic Board Circuits, Schematic Diagram

.05V/DIV, 2 µS/DIV, AC/ALT

ote: Waveforms 1 thru 10 taken with 1 MHz input and RESOLUTION

switch set to .1 Hz. Waveforms 11 thru 16 taken with 100 MHz input.

.05V/DIV, 5 µs/DIV, AC/ALT

.2V/DIV, .5 ms/DIV, DC/ALT

.2V/DIV, .5 ms/DIV, DC/ALT

.1V/DIV, 5 µs/DIV, AC/ALT

9E-8-6

.05V/DIV, .1 µs/DIV, DC/ALT MAG-X10

Part of Figure 8-2. Channel A and Logic Board Circuits, Schematic Diagram (Cont'd)

Model

5305B Schematic

.05V/DIV, .1 µs/DIV, DC/ALT

.05V/DIV, .1 µs/DIV, AC/ALT

A2 1.3 GHz AMPLIFIER

DC VOLTAGE MEASUREMENTS WITH NO INPUT SIGNAL

ATTN: MIN RANGE: 1300 MHz

ATTN: MAX

1. CR5 Anode 10.5V

2. CR5 Cathode 10.2V 1. CR5 Anode 3.1V

3. CR6 Anode 12V 2. CR5 Cathode 2.5V

4. CR6 Anode 11.2V 3. CR6 Anode 0V

5. CR8 Cathode 10.5V 4. CR6 Cathode 0V

6. CR9 Anode 10.2V 5. CR8 Cathode 1.4V

7. CR10 Cathode .8V 6. CR9 Anode 2.0V

8. CR12 Cathode 8V 7. CR10 Cathode .82V

9. CR11 Cathode 8V 8. CR12 Cathode 8.0V

9. CR11 Cathode 8.0V

NOTE

These voltages will vary depending on the position of R13.

9E-8-7

Model 5305B Schematic

g

rams

Dia

Part of Figure 8-2. Channel A and Logic Board Circuits, Schematic Diagram (Cont'd)

A2 TABLE OF ACTIVE ELEMENTS

Ref. Desig. HP Part No. Mfr or Industry Part Nc.

CR1, 7 1902-0032 SZ-10939-107
CR2, 4 1901-0050
CR3 1902-3171 SZ-10939-194
CR5, 6, 8, 9 1901-0639
CR10, 11, 12 1901-0179
CR13 1901-0040

U1 1820-0223 LM301AH
U2 5088-7017
U3 1820-1695
U4 1820-1694

REFERENCE DESIGNATIONS

A1 A2

C1-50 C1-18
CR1-24 CR1-13
J1 L1-3
L1-7 P1
P1 R1-25
Q1-19 U1-4
R1-94 W1
S1-2
TP1-10
U1-28

9E-8-8