HP 11666a schematic

SAFETY

This instrument has been designed and tested according to IEC Publication 348, "Safety Requirements for Electronic Measuring apparatus," and has been supplied in safe condition . This is a Safety Class I instrument. To ensure safe operation and to keep the instrument safe, rhe information, cautions, and warnings in this manual must be heeded . Refer to Section I for general safety considerations applicable to this instrument.

CERTIFICATION

Hewlett-Packard Company certifies that this instrument met its published specifica­ tions at 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 work­ manship for a period of one year from the date of shipment, except that in the

case	of certain components, if any, listed in Section I of this operating manual,
the	warranty shall be for the specified period. Hewlett-Packard will, at its option,

repair or replace products which pro ve to be defective during the warranty period provided they are returned to Hewlett-Packard, and provided the proper preven­ tive maintenance procedures as listed in this manual are followed . Repairs necessi­ tated 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

If this product is sold as a part of a Hewlett-Packard integrated instrument system, the above warranty shall not be applicable, and this product shall be covered only by the system warranty.

Service contracts or customer assistance agreements are available for Hewlett­ Packard products that require maintenance and repair on-site.

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

Con ten ts

Modell1666A

CONTENTS

Section				Page
	GENERAL INFORMATION. . . . . . . . . . . . .				I-I
	I-I.	Introduction..		. ......	I-I
	1-5.	Instruments Covered by Manual		. . . . . ..	I-I
	1-10.	Description	............		I-I
	1-12.0ptions......		..._ .........		I-I
	1-14. Equipment Supplied		...........		I-I
	1-16. Equipment Required but not Supplied ...				1-3
	1-18	Swept Amplitud e Analyzer ........		.	1-3
	1-20	Oscilloscope. . . . . .	. ..	.. . ... ..	1-3
	1-22	Modulator . . ... . ..	_ ...	_ . . . .	1-3
	1-24	Detector. . . . . . . .	. ..... . . . .		1-3
	I-26	Sweep Oscillator .....	. __ .	. _ . . ..	1-3
	1-28	Equipment Avail able ......	. ...	. ....	1-3
	1-30	Warranty. . . .		. .. . ....	1-4
	I-33	Recommended Test Equipmen t ........			1-4
II	INSTALLATION		.. . ..........		2-1
	2- 1.	Introduction .	. ... .. _ .... . ..		2-1
	2-3.	Initial Inspection . . . . .	.... .	... . . ...	2-1
	2-5.	Prepara tion for Use.			2-1
	2-6.	Power Requirements.. . .........			2-1
	2-8.	Selecting RF Input Connector ... . ...			2-1
	2-10.	Incident and Reflected Lead
		Identification ................			2-1
	2-12.	Connecting the 11 666A Retlectometer
		Bridge. . . . . . .			2- I
	2-14.	Using APC-7 RF Connectors. . . . . ..			2-1
	2- 16.	Mating Connectors.	. .		2-1
	2- 18.	Operating Environment ...		... _.. _ .	2- 1
	2-22. Storage and Shipment.		. . . . .		2-2
	2-23.	Environment .....	.. . __	. . . . ....	2-2
	2-25.	Packaging..... . ..	. ............		2-2
III	OPERATION ......... .		... . ........	..	3-1
	3-1.	Introduction.........	. ...	. __ .. . ..	3-1
	3-3.	Features ... ........	....	. ... . ...	3-1
	3-5.	Operator's Check... .	.........	_....	3-1
	3-7.	Operating In structions	.. . .....	_ . . ...	3-1

Section						Page
IV	PERFORMANCE TESTS		.. . .	_ . _ . . .	. . . ..	4-1
	4-1.	Introduction...........		......	..	4-1
	4-3.	Equipment Required. . .		. . . . . . .	. .	4· 1
	4-5.	Test Record. . . . . . . . . . . . . . . . . . ..				4- I
	4-7.	Equivalen t Directivi ty and Output
		SWR Test. ..........		..........		4- I
	4-8.	Input SWR Test .........		. . . .	... ..	4·6
	4-9.	Frequency Tracking Test		.. _ ........	.	4-7
V	ADJUSTMENTS . . .......		_	... .. .....	_ . 5· I
	5- I.	Introduction........	..	_ . . . .	_ . . ...	5· I
	5-3.	Equipment Required ....		. .... ..	....	5-1
	5-5.	Location of Adjustment .............				5-1
	5-7.	Directional Bridge Bias Adjustment. . . ..				5-1
VI	REPLACEABLE PARTS		... .	.... . .......		6- I
	6-1.	Introdu ction ........	..........		...	6-1
	6-3.	Abbreviations ........		_ _.. . .....	..	6-1
	6-5.	Replaceable Parts list . .		. . . . . . .	. .	6· I
	6-7.	Ordering Instructions ...		_ . . .....	. ...	6-1
VII	MANUAL CHANGES . ..........			. ......		7-1
	7-1.	Introduction .............		. .......		7·1
VIII	SERVICE... . ...		. . . ... . ........ 8-1
	8-1.	Introducti on..	........... . . . . .			8·1
	8-3.	Principl es of Operation ..............				8-1
	8-5.	TroublesllOoting............			. .	8- I
	8-7.	Recommended Test Equipment. .			. . . . .	8- 1
	8-9.	Repair.				8- I
	8-12. Printed Circuit Board Removal
		and Installation.	. . . .	. . . . . . ..		8-1
	8-14.	Changing Type N Connectors. ..				8- 1
	8-16.	APC Connector Center Collet
		Replacemen t ................				8-1
	8-18.	Soldering Cable Leads. . . . . .			. . . ..	8-5
	8-20.	Soldering to Etched Circuit Boards . ...				8-5
	8-22.	Compon en t Replacement ..........				8-5
	8-23.	Transistor Replacement. . . . .			.	8-5
	8-25. Troubleshooting Procedures .....				. . ...	8-6
	8-27. Troubleshooting Hints.			. _ _... . ..		8-6

II

	Model ll666A					Con ten ts
		ILLUSTRATIONS
	Figure		Page	Figure		Page
	I-I .	Model I J 666A Reflectometer Bridge with		8-1.	Prin ted Circui t Board Removal
		Accessories Supplied . ...... .. . . . .	.. 1-0		and Replacemen t. .... ..... ....	... . 8-2
	2-1.	Use of APC-7 Connectors . .. ..... . .....	2-2	8-2.	Schematic Diagram Notes	8-7
	3-1.	Model 11666A Features	3-2
				8-3.	Test Setup for Measuring AC Gain	8-9
	3-2.	Operator's Check	' 3-3
	3-3.	Model 11666A Typical Measurement Setup ..	3-4	8-4.	Model 11666A Troubleshooting
	4-1.	Equivalent Directivity and Output SWR			Flow Diagram .. .......... . .......	8-10
		Test Setup. . . . . . . . . . . . . . . . . . .	4-2	8-5.	Isolating Trouble to an Individual Componen t
	4-2 .	Graph for Approximating Equivalent
					in the Amplifier	8-11
		Output SWR	4-4
				8-6 .	A4 Mas ter Board, Component Location	8-12
	4-3.	Input SWR Test Setup	4-6
	4-4.	Frequency Tracking Test Setup ...... ... .	4-8	8-7.	Model 11666A, Schematic Diagram .......	8-1 3
	5-1 .	Directional Bridge Bias Adjustment Test		8-8.	A21A3 Preamplifier Component
		Setup	5-1
					Identification Illustration	8-14
	6-1.	RF IN Connector J I Exploded View	6-4
	6-2.	Model 11666A Illustrated Parts		8-9.	A21 A3 Preamplifier Assembly ,
		Breakdown .. . ... .. . . ...... .. . .. .	6-5		Schematic Diagram . .... ... .. ......	8-15

TABLES

Table		Page	Table		Page
I-I.	Specifications ...... .... ... .....	.... 1-2	6-1.	Reference Designators and Abbreviations	6-1
1-2.	Supplemental Characteristics .... ... . ..	.. 1-3		Used in Manual ......... ... .....
1-3.	Recommended Test Equipment . .... .....	1-5			6-2
4-1.	Model 11666A Performance Test Record ...	A-IO	6-2.	Replaceable Parts .. ... ..............

111

Model J 1666A

General Information

SECTION I

GENERAL INFORMATION

1-1. INTRODUCTION

1-2. This manual contains operating and service in­ formation for the Hewlett-Packard Model 11666A Re­ flectom e ter Bridge. The instrumen t is shown in Figure I-I .

1-3. On the first page of this manual, below the manual part number, is a "Microfiche" part num­ ber. This number may be used to order 4x6-inch microfilm transparencies of the manual. Each microfiche contains up to 60 photo-duplicates of the manual pages. The microfiche package also in­ cludes the latest Manual Changes supplement as well as all pertinent Service Notes.

1-4.	Instrument specifications are listed in Table
1- l.	These speci fications are performanance stan­

dards or limits against which the instrument may be tested. Table 1-2 1ists supplemental chracteristics. Supplemental characteristics are not speci fications but are typical characteristics included as additional infonnation for the user.

1-5. INSTRUMENTS COVERED 8Y MANUAL

1-6. This instrument has a two-part serial number. The first four digits and the letter comprise the serial number prefix. The last five digits form the sequential suffix that is unique to each instrument. The contents of this manual apply directly to instruments having the same serial number prefix(es) as listed under SERIAL NUMBERS on the title page.

1-7. An instrument manufactured after the printing of this manual may have a serial prefix that is not listed on the title page. This unlisted serial prefix indicates that the instrument is different from those documented in this manual. The manual for this instrument is supplied with a yellow Manual Changes supplement that contains "change information" that documents the differences.

1-8 . In addition to change information, the supple­ ment contains information for correcting errors in the manual. To keep this manual as current and accurate as possible, Hewlett-Packard recommends that you periodically request the latest Manual Changes sup­ plement. The supplement for this manual is keyed to

this manual's print date and part number, both of which appear on the title page. Complimentary copies of the supplement are available from Hewlett­ Packard .

1-9. For information concerning a serial number listed in the Manual Changes supplement, contact your nearest Hewlett-Packard office.

1-10. DESCRIPTION

1-11. The Model 11666A Reflectome ter Bridge is used with the HP Model 8755A Swept Amplitude Analyzer for reflection and transmission measure­

men ts	over the 40 MHz to 18 GHz frequency
range.	Effec ti ve external leveling is accomplished

by measuring the ratio of Ref1ected and Test port signals to the RF input signal.

1-12. OPTIONS

1-13. The foHowing connectors are available for the 11666A:

Option 00 I : RF IN, Type N Female; TEST, Type N Male

Option 002: RF IN, Type N Female TEST, APC-7

Option 003: RF IN, APC-7; TEST, APC-7

1-14. EQUIPMENT SUPPLIED

I-IS. The equipment supplied is shown in Figure 1-1. A set of color-coded snap-on clips is also pro­ vided to identify the ends of the Incident and Reflected cables.

NOTE

All operation and maintenance pro­ cedures in this manual utilize the 116658 Modulator. The 116658 may be eliminated if the RF plug-in used is 8755A compatible. With the 116658 eliminated the 8755A MOD­ ULATOR DRIVE is connected to the 8620A EXT AM rear panel connector.

1- J

Generallnfonnation

Model 11666A

Table i-i. Specifications

SPECI FICATIONS

Frequency Range: 40 MHz to J8 GHz

Maxjmum Inpu t Power: +15 dBm (31.6 mW)

Frequency Range		Equivalent Directivity
40 to 100 MHz		~ 30 dB
0.1 to I GHz		> 38	dB
I to 2	GHz	> 36 dB
2 to 4	GHz	~ 33	dB
4 to 8	GHz	~29 dB
8 to 12 GHz		~ 27	dB
12 to 18 GHz		> 26	dB

Input SWR: .;;; 1.92

Frequency Tracking:

Between Incident and Reflected ports: .;;; 3.2 dB Bet\veen Incident and Test ports: .;;; 4.2 dB

(In cludes 11664A Detector)

Connecto rs:

Standard: Ty pe N-FemaJe (Input and Output)

Option 001: Input Type N-FemaJ e, Output Type N~\lale Option 002: Input Type N-FemaJe, Output APC-7 Option 003: APC-7 (Input and Output)

Dimensio ns :

69.9 nun wide X 69 .9 mm high X46.6 mm de ep (2.75 inches X 2.75 inches X 1.83 in che s)

Cabl e Length: 1219 mm (48 in ches)

Weight:	Net , 0.7 kg (J.5 lb.)
	Shipping, 2.26 kg (5 .13 lb.)

Equivalent Output SWR

.;;; 125

.;;; 1.25

.;;; 1.25

.;;; 1.25

.;;; 125

.;;; 127

.;;; 1.52

1-2

General Information

1-30. WARRANTY

I -3 I. Any attempt to disassemble or repair the Di­ rectional Bridge (A 1), Reference Termination (AT I), or TEST port (A I J3) will automatically void the war­ ranty. See Paragraph 8-9 in the Service section for the recommended repair procedures.

1-32. Subj ection of the	instrument to excess ive
RF INPUT power (>+ 15	dBm or 31.6 mw) will

ModeJ 1 1666A

automatically void the warranty.

1-33. RECOMMENDED TEST EQUIPMENT

1-34 . Table I -3 lists recommended test equipment. This equipment is used in performance testing or troubleshooting the Model 1 I 666A. Other equipment may be substituted, provided its specifications equal or exceed the specifications given under Critical Specifications .

1-4

Model 1l666A

Instrument

Type

Sweep Oscillator

Swept Amplitude

Analyzer

Audio Oscillator

Modulator

Reflectometer Bridge

Detector

20-crn Air Lines (2)

Sliding Load

Coaxial Termination

General Information

Table 1-3. Recommended Test Equipment

Critical Specifications

Frequency,40MHz to 18 GHz

Provides 27.8 kHz modulation signal

Powers I 1666A Retlectometer

Bridge and 11664A Detector

Processes and displays the detected signaJs.

Recommended Model	Use*
HP Model 8620A mainframe with:	P, T
HP Model 86222 A (40 MHz to 2 GHz)
HP Model 86290A (2 to 18 GHz)
HP 8755 A/l82 T	P, T

Frequency:	27 .8 kHz	HP 200CD	T
Output:	10 mV adjustable
Frequency:	40 MHz to 18 GHz	HP 11665 B	P, T
Modulation:	27.8 kHz
		HP 11666A	P
Frequency:	40 MHz to 18 GHz	HP 11 664A	P,T
Frequency:	40 MHz to 18 GHz	I-lP 11567 A	P
Frequency:	2 GHz to 18 GHz	HP905A	P
Load SWR:	,;;; 1.05
Frequ ency:	40 MHz to 2 GHz	HP 909A Option 012	P
Load SWR:	,;;; 1.05
Connector:	Type N MaJe

Coaxial Short	Fits 11666A TEST port connector		HP 11512A (Type N Male)	P
			HP J 1511A (Type N Female)
			HP 11565A (APC-7)
Open-End Wrench	Thin 1/2 x 9/l6-inch wrench		HP Part No. 87 10-0877	P, T
Soldering Iron	Wattage:	37.5 watts	Ungar No. 776 Handle with	T
	Tip Temp :	750 to 800 0 F	Ungar No. 1237 Heating Unit
	Tip Size:	1/8" 00
Soldering Tip	Shape:	cllisel	Ungar No. PL 113	T
	Size:	1/8"
De-soldering Aid	Su ction device to remove		Soldavac by the Edsyn Company,	T
	molten solder from connection		Arleta, Cali fornia
Protective Coating	Good electIica l insulation ,		Krylon No. 1302	T
	corrosion-prevention properties
OsciUosco pe	Vert. Bandwidth: ~250 kHz		HP 182 A/ 180 I A/ 1802 C	T
	Vert. Sensitivity: >1 mV/cm
"P = Performance Testing	T = Troubleshooting

1-5/1-6

Model I t666A

Installation

SECTION II

INSTALLATION

2-1. INTRODUCTION

2-2. This section contains information concerning initial inspection, preparation for use, mating connec­ tors, and storage and shipment.

2-3. INITIAL INSPECTION

2-4 . If the shipping container or cushioning material is damaged, it should be kept until the contents of the shipment have been checked for completeness and the instrument has been checked mechanically and elec­ trically. The contents of the shipment should be as shown in Figure I-I . Procedures for checking electri­ cal performance are given in Section IV. If the con­ tents are incomplete, if there is mechanical damage or defect, or if the instrument does not pass the electrical performance test, notify the carrier as well as the Hewlett-Packard office. Keep the shipping materials for the carrier's inspection. The HP office will arrange for repair or replacement without waiting for claim settlement.

2-5. PREPARATION FOR USE

2-6. Power Requirements

2- 7. Power for the Model 11666A Reflectometer Bridge is obtained from the Model 8755A Swept Amplitude Analyzer.

2-8. Selecting RF Input Connector

2-9. The RF Input Connector outer shell and inner conductor assembly may be replaced, thereby chang­ ing the type of RF Input connector. This can be done by the operator using a thin open-end wrench. Refer to the Service section of this manual, Paragraph 8-14 for details.

2-10. Incident and Reflected Lead Identifica­ tion

2- 1I. Colored clip-on clips are furnished for lead identification. Place matching clips on both ends of each cable.

2-12. Connecti ng the 11666A Reflectometer Bridge

2-13 . To connect the 11666A to the 8755A, proceed as follows:

a. Insert the 11666A dc connectors into the corres­ ponding 8755A mating connectors INDICENT to Channel Rand REFL to Channel A. The co nnec­ tors are keyed and the plug should be inserted with the key facing down wards.

b.Secure the dc connector in the 8755A turning the outer shell clockwise. This tightens the connector.

c.To connect the RF Input

I. Read CAUTION in paragraph 3-8.

2.If either connector is an APC-7, refer to Figure 2-1 for instructions.

2-14. Using APC-7 RF Connectors

2- I 5. Figure 2-1 shows the use of APC-7 connec­ tors . Read the instructions on this figure before at­ tempting to use APC-7 connectors.

2-16. Mating Connectors

2-17. Mating connectors for Type N connectors are the corresponding Type N connectors whose dimensions conform to US specification MIL-C­ 39012. Mating connectors for the APC-7 connec­ tors are other APC-7 connectors. Mating connec­ tors for other connector types are the corres­ ponding connector of the same series.

2-18. Operating Environment

2-19. Temperature. The instrument may be op­

erated in temperatures from - 25°C to 55°C.

2-20. Humidity. The instrument may be operat­ ed in environments with humidity up to 95%. However, the instrumen ts should also be protected from tempe rature extremes which cause conden­ sation within the 11666A.

2-1

Section III

Operation

SECTION III

OPERATION

3-1. INTRODUCTION

3-2. This section contains instructions concerning operation of the Model 11666A Reflectometer Bridge.

3-3. FEATURES

3-4. Features of the Model 11666A are shown In Figure 3-1.

3-5. OPERATOR'S CHECK

3-6. Figure 3-2 is an operator's check procedure, allowing the operator to make a quick check of the main system functions prior to use. The test covers the

entire measurement system and incorrect indications may be caused by any portion of the system. If the

Reflectometer Bridge is suspected, use the perfor­ mance tests in Section IV to determine if the Reflec­

tometer Bridge is working correctly. Otherw ise, fol­ low the troubleshooting tree in Section VIII to isolate the problem.

3-7. OPERATING INSTRUCTIONS

3-8. Figure 3-3 provides instruc tions for making reflection and transmission measurements. The test setup in Figure 3-3 shows a typical reflectometer test setup for simultaneollsly measuring reflection and transmission characteristics of a device under test.

Do NOT apply more than + 15 dBm RF Power or more than ± 10 volts de into the 11666A. If more than this power or voltage is applied, the 11666A will be damaged.

3-1