L LIBRARY
.
USNAS ATSUGI, JAPAN
---_-
35QC/D
ATTENUATOR SET
OPERATING AND SERVICE MA-NUAL
COPYRIGHT AND DISCLAIMER NOTICE
Copyright - Agilent Technologies, Inc. Reproduced with the permission of Agilent
Technologies Inc. Agilent Technologies, Inc. makes no warranty of any kind with regard
to this material including, but not limited to, the implied warranties of merchantability
and fitness for a particular purpose. Agilent Technologies, Inc. is not liable for errors
contained herein or for incidental or consequential damages in connection with the
furnishing, performance, or use of this material or data.
CKARD
CERTIFICATION
The Hewlett-Packard Company certifies that this instrument was
thoroughly tested and inspected and found to meet its published
specifications when it was shipped from the factory. The Hewlett-
Packard Company further certifies that its calibration measurements
are traceable to the U.S. National Bureau
allowed by the Bureau’s calibration facility.
of
Standards to the extent
WARRANTY AND ASSISTANCE
All Hewlett-Packard products are warranted against defects in
materials and workmanship. This warranty applies for one year from
the date of delivery, or, in the case of certain major components listed
in the operating manual, for the specified period. We will repair or
replace products which prove to be defective during the warranty
period. No other warranty is expressed or implied. We are not liable
for consequential damages.
For any assistance contact your nearest Hewlett-Packard Sales and
Service Office. Addresses are provided at the back of this manual.
1 ALL
& MANUAL CHANGES
MODEL 350C/D
ATTENUATOR SET
Manual Serial Prefixed: 220
-hp- Part No. 00350-90202
Instrument Serial Number Make Manual Changes
Pagx~ 6-5, Rc~placcable Parts: Make the Following Additions:
350C-95A, Amy, 10 dB attenuator Mfr 28480 (Includes
one each 350C-12A, 350C-34A and 350C-55A).
35OC-95B, Assy, 100 dB attenuator Mfr 28480 (Includes
one each 350C-12B, 35OC-34B and 350C-55B).
350D-95A, Assy, IO dB attenuator Mfr 28480 (Includes
one each 350C-12A, 350C-55A and 350D-34A).
350D-95B, Assy, 100 dB attenuator Mfr 28480 (Includes
35OC-12B, 350C-55B and 350D-34B).
Scptellll>er 2 -t , 19GG
Supplement A for 00350-90202
OPERATING AND SERVICE MANUAL
(HP PART NO. 00350-90202)
MODEL 350C/D
ATTENUATOR SET
SERIALS PREFIXED: 220-
Copyright Hewlett-Packard Company 1962
P. 0. Box 301, Loveland, Colorado, 80537 U. S. A.
01307-3 Printed: APRIL 1966
Model 350C/D
Table of Contents
List of Tables
List of Illustrations
TABLE OF CONTENTS
Section
age
Section Page
I GENERAL INFORMATION . . . . . . . . . l-l IV PRINCIPLES OF OPERATION . . . . . . . 4-l
l- 1. Introduction . . . . . . . . . . . . . . l- 1
4-l. General. . . . . . . . . . . . . . . . 4-l
l-2. Difference Between Models 350C 4-3. Attenuation Expressed in Decibels. . 4-l
and 350D . . . . . . . . . . . . . l-l 4-4. Power and Voltage Ratios, . . . . 4-l
l-4. Description. . . . . . . . . . . . . l-l 4-7. Reference for DB . . . . . . . . . 4-l
1-7. Uses. . . . . . . . . . . . . . . . . . l-l
l-9. Differences Between Instruments. . . l-l
Section Page
II INSTALLATION. .............. 2-l
2-1. Introduction .............. 2-l
2-3. Initial Inspection ........... 2-l
2-5. Installation .............. 2-l
2-7. Combining Case .......... 2-l
2-9. Adapter Frame. .......... 2-l
2-11. Repackaging for Shipment. ...... 2-l
Section
Page
III OPERATING INSTRUCTIONS ........ 3- 1
3-l. Operating Considerations. ...... 3- 1
3-2. Impedance ............. 3- 1
3-4.
3-6.
Leads and Connections. ...... 3-l
Input Power Limits ........ 3-3
3-8. Operating Procedures. ........ 3-3
3-9. Matched Impedance ........ 3-3
3-12. Use of Impedance-Matching Netowrk 3-3
Section
V MAINTENANCE. . . . . . . . . . . . . . .
Page
5-l
5- 1. Introduction. . . . . . . . . . . . . . 5- 1
5-3. Instrument Cover Removal. . . . . . 5-l
5-5. Component Replacement . . . . . . . 5-l
5-6. Removal of Attenuators . . . . . . 5-l
5-8. Replacement of Resistors. . . . . 5-l
5-10. DC Performance Test . . . . . . . . 5-l
5-13. AC Performance Test . , . . . . . . 5-4
5-16. Calibration Procedure . . . . . . . . 5-5
Section
Page
VI REPLACEABLE PARTS . . . . . . . . . . 6-l
6- 1. Introduction. . . . . . . . . . . . . . 6- 1
6-4. Ordering Information. . . . . . . . . 6-l
6-6. Non-Listed Parts . . . . . . . . . 6-l
Appendix
A CODE LIST OF MANUFACTURERS
Appendix
B SALES AND SERVICE OFFICES
LIST OF TABLES
Number Page Number
Page
l-l. Specifications . . . . . . . . . . . . . . . l-l 5-3. AC Performance Test, Supplemental
3-l. Attenuation Factors . . . . . . . . . . 2-0/3-O Data . . . . . . . . . . . . . . . . . . . 5-5
3-2. Model 350C Matching Network Values. . . 3-3 5-4. 1 DB Step Attenuator Padding Data . . . . 5-5
3-3. Model 350D Matching Network Values. . . 3-4 5-5. 10 DB Step Attenuator Padding Data . . . 5-6
5-1. Test Equipment Required . . . . . . . . . 5-O 6-l. Reference Designation Index . . . . . . . 6-2
5-2. DC Performance Test, Supplemental Data 5-4 6-2. Replaceable Parts. . . . . . . . . . . . . 6-4
LIST OF ILLUSTRATIONS
Number Page
l-l. Model 350D Attenuator Set . . . . . . . . . 1-O
3-l. Model 350C/D Typical Applications. . . . . 3-2
3-2. Model 350C Matching Network . . . . . . . 3-3
3-3. Model 350D Matching Network . . . . . . . 3-4
4-l. Model 350C/D Simplified Circuit . . . . . . 4-l
5-l. Cabinet Removal. . . . . . . . . . . . . . . 5-O
5-2. Model 350C/D Rear View (Rear Panel
Removal . . . . . . . . . . . . . . . . . . 5-l
5-3. Assembly Al Component Identification . . . 5-2
5-4. Assembly A2 Component Identification . . . 5-3
5-5. DC Performance Test Setup. . . . . . . . . 5-4
5-6. AC Performance Test Setup. . . . . . . . . 5-4
5-7. Model 350C/D Schematic Diagram . . . 5-7/5-8
01307-2
. . .
111
Section I
Figure l-l
Model 35OC/D
Figure l-l. Model 350D Attenuator Set
1-o 01307-2
Model 350C/D
Section I
Paragraphs l-l to l-10 and Table l-l
SECTION I
GENERAL INFORMATION
l-l. INTRODUCTION.
l-2. DIFFERENCE BETWEEN MODELS 350C
AND 350D.
1-3. The basic difference between the @ Model 350C
and Model 350D Attenuator Set is the input-output
impedance value. The Model 350C has an innut-outnut
impedance of 500 ohms, and the Model 3506 an inputoutput impedance of 600 ohms. Because of the semilarity in &%&n. use, circuitry and specifications, the
two mstruments are.referred-to as the Model 35dC/D
in this manual.
l-4. DESCRIPTION.
l-5. The Model 350C/D (Model 350D shown in
figure l-l) is an accurate, wide frequency range
attenuator which provides attenuation from 0 db to a
maximum of 110 db. Specifications for both instru-
ments are given in table l-l. The Model 350C/D will
dissipate a maximum of 5 watts in continuous use
with good accuracy from dc to 1 MC. Each Model
350C/D consists of two sections: (1) 100 dbadjustable
in 10 db-steps, and (2) 10 db, adjustable in 1-db steps.
The two sections are additive, allowing attenuation in
1-db or lo-db increments over the full llO-db range.
A floating input is included which isolates the attenuator
circuit ground from cabinet ground, allowing an ac
input to be at a dc level.
l-6. The @ modular enclosure design allows con-
venient conversion from a bench model to a model
---... ..&,‘* .,.,,--, ^
which mounts in a standard 19-inch rack (see paragraph 2-5). The modular design provides the me-
chanical stability necessary for stacking instruments
on a flat surface.
1-7. USES.
l-8. Wide frequency range, high power dissipation
capability, and accuracy make the Model 350C/D
useful in such applications as attenuating an oscillator
output, checking gain and frequency response of an
amplifier, and determining transmission loss. Use
of the Model 350C/D is possible with a mismatched
load or source impedance. Information on impedance
matching networks and the attenuation losses involved
are given in section III.
1-9. DIFFERENCES BETWEEN INSTRUMENTS.
l-10. The Hewlett-Packard Company uses a twosection, eight-digit serial number to identify instruments (e.g., 000-00000). The serial number is on a
plate attached to the rear panel of the instrument.
The first three digits are a serialprefixnumber, also
appearing on the title page of this manual, and the
last five digits refer to a specific instrument. If the
first three digits of the instrument serial number are
not the same as those on the title page, change sheets
included with this manual will define any differences
between other instruments and the Model 350C/D
described herein. If the change sheets are missing,
your @ Sales and Service Office can supply the infor-
mation. (See Appendix B for office locations.)
ATTENUATION:
110 db in 1-db steps
ACCURACY, lo-DB SECTION:
From dc to 100 kc, error is less than iO.125 db
at any step; from 100 kc to 1 MC, error is less
than kO.25 db at any step.
ACCURACY, lOO-DB SECTION:
From dc to 100 kc, error is less than kO.25 db
at any step up to 70 db, less than 20.5 db above
70 db; from 100 kc to 1 MC, error is less than
iO.5 db at any step up to 70 db; less than lt0.75 db
above 70 db.
01307-2
Table 1-l. Specifications
POWER CAPACITY:
35OC, 500 ohms: 5 watts (50 vdc or rms)
maximum, continuous duty
350D, 600 ohms: 5 watts (55 vdc or rms)
maximum, continuous duty
DIMENSIONS:
Module 6-3/32 in, high, 5-l/8 in. wide,
8 in. deep
WEIGHT:
Net 5 lb, shipping 7 lb
l-l
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