Agilent Technologies 355C Service manual

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Agilent Technologies
355C, D, E, F
VHF Attenuators
Operating and Service
Manual
Agilent Part Number: 00355-90051
Printed in USA
April 2002
Supersedes: November 2001
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ii VHF Attenuators Operating and Service Manual
Notice
The information contained in this document is subject to change without
notice.
Agilent Technologies 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
shall not be liable for errors contained herein or for incidental or
consequential damages in connection with the furnishing, performance, or
use of this material.
Agilent Technologies assumes no responsibility for the use or reliability of
its software on equipment that is not furnished by Agilent Technologies.
This document contains proprietary information which is protected by
copyright. All rights are reserved. No part of this document may be
photocopied, reproduced, or translated to another language without prior
written consent of Agilent Technologies.
Restricted Rights Legend
Use, duplication, or disclosure by the U.S. Government is subject to
restrictions as set forth in subparagraph (c)(1)(ii) of the Rights in Technical
Data and Computer Software clause at DFARS 252.227-7013 for DOD
agencies, and subparagraphs (c)(1) and (c)(2) of the Commercial Computer
Software Restricted Rights clause at FAR 52.227-19 for other agencies.
Serial Number Prefix
The specifications in this manual apply to the instruments with the following
serial numbers or greater:
© Copyright 1997, 2001, 2002 Agilent Technologies, Inc
Model Serial Numbers (min.)
355C 2524A44630
355D 2522A46649
355E 1205A38159
355F 1203A03244
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VHF Attenuators Operating and Service Manual iii
What You’ll Find in This Manual…
This operating and service manual contains the following:
•Instrument Description and Specifications
•Replaceable Parts and Accessories
•Installation Instructions
•Operating Instructions
•Schematics and Diagrams
Warranty
Custom systems are warranted by contractual agreement between Agilent
Technologies and the Customer.
Certification Agilent Technologies certifies that this product met its published specifications at the time of
shipment from the factory.
Documentation
Warranty THE MATERIAL CONTAINED IN THIS DOCUMENT IS
PROVIDED "AS IS," AND IS SUBJECT TO BEING CHANGED,
WITHOUT NOTICE, IN FUTURE EDITIONS. FURTHER, TO
THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW,
AGILENT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS
OR IMPLIED WITH REGARD TO THIS MANUAL AND ANY
INFORMATION CONTAINED HEREIN, INCLUDING BUT NOT
LIMITED TO THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. AGILENT SHALL NOT BE LIABLE FOR ERRORS
OR FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES IN
CONNECTION WITH THE FURNISHING, USE, OR
PERFORMANCE OF THIS DOCUMENT OR ANY
INFORMATION CONTAINED HEREIN. SHOULD AGILENT
AND THE USER HAVE A SEPARATE WRITTEN AGREEMENT
WITH WARRANTY TERMS COVERING THE MATERIAL IN
THIS DOCUMENT THAT CONFLICT WITH THESE TERMS,
THE WARRANTY TERMS IN THE SEPARATE AGREEMENT
WILL CONTROL.
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iv VHF Attenuators Operating and Service Manual
Assistance Product maintenance agreements and other customer assistance agreements
are available for Agilent Technologies products.
For assistance, call your local Agilent Technologies Sales and Service Office
(refer to “Support and Service”).
Support and Service
Any adjustment, maintenance, or repair of this product must be performed
by qualified personnel. contact your local Agilent Technologies sales and
service office.
Online assistance: www.agilent.com/find/assist
United States
(tel) 1 800 452 4844 Latin America (tel) [phone]
(fax) [phone]
Canada
(tel) 1 877 894 4414
(fax) [phone]
New Zealand
(tel) 0 800 738 378
(fax) ([phone]
Japan
(tel) ([phone]
(fax) ([phone]
Australia
(tel) 1 800 629 485
(fax) ([phone]
Malaysia
(tel) 1 800 828 848
(fax) 1 800 801 664
Philippines
(tel) (632) 8426802
(tel) (PLDT subscriber only):
1 800 16510170
(fax) (632) 8426809
(fax) (PLDT subscriber only):
1 800 16510288
Thailand
(tel) outside Bangkok:
[phone]
(tel) within Bangkok:
[phone]
(fax) (66) 1 661 3714
Taiwan
(tel) 0800-047-866
(fax) (886) 2 25456723
People’s Republic of China
(tel) (preferred): 800-810-0189
(tel) (alternate):
10800-650-0021
(fax) 10800-650-0121
India
(tel) 1-600-11-2929
(fax) 000-800-650-1101
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VHF Attenuators Operating and Service Manual v
Safety and Regulatory Information
Review this product and related documentation to familiarize yourself with
safety markings and instructions before you operate the instrument This
product has been designed and tested in accordance with international
standards.
WARNING The WARNING notice denotes a hazard. It calls attention to a procedure,
practice, or the like, that, if not correctly performed or adhered to, could result
in personal injury. Do not proceed beyond a WARNING notice until the
indicated conditions are fully understood and met.
CAUTION The CAUTION notice denotes a hazard. It calls attention to an operating
procedure, practice, or the like, which, if not correctly performed or adhered
to, could result in damage to the product or loss of important data. Do not
proceed beyond a CAUTION notice until the indicated conditions are fully
understood and met.
Instrument Markings
When you see this symbol on your instrument, you should refer to the instrument’s
instruction manual for important information.
This symbol indicates hazardous voltages.
The laser radiation symbol is marked on products that have a laser output.
This symbol indicates that the instrument requires alternating current (ac) input.
The CE mark is a registered trademark of the European Community. If it is
accompanied by a year, it indicates the year the design was proven.
The CSA mark is a registered trademark of the Canadian Standards Association.
1SM1-A This text indicates that the instruments an Industrial Scientific and Medical Group 1
Class A product (CISPER 11, Clause 4).
This ISM device complies with Canadian ICES-001.
Cet appareil ISM est conforme a la norme NMB du Canada.
This symbol indicates that the power line switch is ON.
This symbol indicates that the power line switch is OFF or in STANDBY position.
!
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vi VHF Attenuators Operating and Service Manual
Safety Earth
Ground This is a Safety Class I product (provided with a protective earthing
terminal). An uninterruptible safety earth ground must be provided from the
main power source to the product input wiring terminals, power cord, or
supplied power cord set. Whenever it is likely that the protection has been
impaired, the product must be made inoperative and secured against any
unintended operation.
Before Applying Power Verify that the product is configured to match the available main power
source as described in the input power configuration instructions in this
manual. If this product is to be powered by autotransformer, make sure the
common terminal is connected to the neutral (grounded) side of the ac power
supply.
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VHF Attenuators Operating and Service Manual vii
Typeface Conventions
Italics •Used to emphasize important information:
Use this software only with the xxxxxX system.
•Used for the title of a publication:
Refer to the xxxxxX System-Level User’s Guide.
•Used to indicate a variable:
Type LOAD BIN filename.
Instrument Display •Used to show on-screen prompts and messages that you will see on the
display of an instrument:
The xxxxxX will display the message CAL1 SAVED.
[Keycap] •Used for labeled keys on the front panel of an instrument or on a
computer keyboard:
Press [Return].
{Softkey} •Used for simulated keys that appear on an instrument display:
Press {Prior Menu}.
User Entry •Used to indicate text that you will enter using the computer keyboard;
text shown in this typeface must be typed exactly as printed:
Type LOAD PARMFILE
•Used for examples of programming code:
#endif // ifndef NO_CLASS
Path Name •Used for a subdirectory name or file path:
Edit the file
usr/local/bin/sample.txt
Computer Display •Used to show messages, prompts, and window labels that appear on a
computer monitor:
The Edit Parameters window will appear on the screen.
•Used for menus, lists, dialog boxes, and button boxes on a computer
monitor from which you make selections using the mouse or keyboard:
Double-click EXIT to quit the program.
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viii VHF Attenuators Operating and Service Manual
Typeface Conventions
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VHF Attenuators Operating and Service Manual 1
General Information
General Information
This manual contains operating instructions for 355C, 355D, 355E, and
355F VHF Attenuators. Included in the manual is the information required
to install and test these attenuators.
Description The Agilent Technologies Model 355C, 355D, 355E, and 355F attenuators
are 50-ohm, coaxial step attenuators usable from dc to 1 GHz. Models 355C
and 355E provide 0 to 12 dB of attenuation in 1 dB steps.
Models 355D and 355F provide 0 to 120 dB of attenuation in 10 dB steps.
The 355C and 355D are manual attenuators. The 355E and 355F are
programmable. The schematic for the Model 355C/D is shown in Figure 1,
and that of the Model 355E/F in Figure 2.
The attenuator sections consist of resistor pi networks which are switched in
or bypassed by microswitches. In the 355C and 355D, the microswitches
are actuated by cams (see Figure 1). In the 355E and 355F, the
microswitches are actuated by solenoids (see Figure 2). The standard RF
connectors are BNC type.
In the 355E and 355F, power must be continuously applied to the solenoid to
actuate the microswitch (i.e., to insert an attenuator section). Each solenoid
draws approximately 0.lA at 15 Vdc.
Dimensions for the individual instruments are provided in Table 1,
“Dimensions,” on page 2.
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2VHF Attenuators Operating and Service Manual
General Information
NOTE Dimensions are for general information only. If accurate dimensions are
required for building special enclosures, contact your nearest Agilent
Technologies office.
Table 1 Dimensions
355C, D 355E, F
Length 152 mm (5.98 in) 137 mm (5.39 in)
Height 69 mm (2.72 in) 72 mm (2.83 in)
Width (without RF connectors) 45 mm (1.77 in) 45 mm (1.77 in)
Width (with connectors):
Standard (BNC)
Option 001 (Type-N)
Option 005 (TNC)
73 mm (2.88 in)
94 mm (3.70 in)
69 mm (2.72 in)
73 mm (2.88 in)
121 mm (4.76 in)
24 mm (0.94 in)
Protrusion of connectors:
BNC
Type-N
TNC
14.06 mm (0.55 in)
24.5 mm (1.00 in)
12 mm (0.47 in)
14.06 mm (0.55 in)
24.5 mm (1.00 in)
12 mm (0.47 in)
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VHF Attenuators Operating and Service Manual 3
General Information
Figure 1 355C and 355D Schematic Diagram
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4VHF Attenuators Operating and Service Manual
General Information
Figure 2 355E and 355F Schematic Diagram
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VHF Attenuators Operating and Service Manual 5
General Information
Specifications Instrument specifications are listed in Table 2. These specifications are the
performance standards or limits against which the instruments may be
tested.
Table 2 Specifications
MODELS 355C and 355E
Attenuation Range 0 to 12 dB
Attenuation Steps 1 dB
Overall Accuracy:
at 1000 Hz
dc to 500 MHz
dc to 1000 MHz
0.1 dB
0.25 dB
0.35 dB
MODELS 355D and 355F
Attenuation Range 0 to 120 dB
Attenuation Steps 10 dB
Overall Accuracy:
at 1000 Hz
below 1000 MHz 0 to 120 dB 0.3 dB 0 to 90 dB 1.5 dB
90 to 120 dB 3 dB
MODELS 355E and 355F
Switching Speed 65 ms
Required Solenoid Power +15 to +18 Vdc, 1/8 A
MODELS 355C/E and 355D/F
Frequency Range dc to 1000 MHz
Impedance 50 ohms (nominal)
Maximum SWR (input and output):
below 250 MHz
below 500 MHz
below 1000 MHz
1.2
1.3
1.5
Maximum residual attenuation
(insertion loss at 0 dB) 0.20 dB + 2.30 dB/GHz
Maximum power dissipation 0.5W (average)
Maximum pulse voltage 350 Vpk 200 sec
Connectors
Standard
Option 001
Option 005
BNC (female)
Type-N (female)
TNC (female)1
1. Available on the 355C only.
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6VHF Attenuators Operating and Service Manual
General Information
Power Rating
CAUTION Do not exceed the RF power rating of 0. 5W average, or 2450W peak with a
maximum pulse width of 200 s. Do not connect an attenuator RF input or
output connector to greater than 5 Vdc. If the attenuator must be connected
to a device with a potential greater than 5 Vdc, use a blocking capacitor.
Accessories Supplied The 355E and 355F programmable attenuators are supplied with a 7-pin,
male connector (1251-1037) for the solenoid drive input.
Attenuator Options Figure 3 on page 7 shows solenoid and connector wiring diagrams available
under Option 007 for 355E and 355F.
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VHF Attenuators Operating and Service Manual 7
General Information
Attenuator Options
Figure 3 355E and 355F Solenoid and Connector Wiring Diagrams
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8VHF Attenuators Operating and Service Manual
Installation
Installation
Initial Inspection Inspect the shipping container for damage. If the shipping container or
cushioning material is damaged, it should be kept until the contents of the
shipment have been checked mechanically and electrically. A procedure for
checking electrical performance is given under “Operator’s Check” on
page 9 (also see “Performance Tests” on page 12). If the contents of the
shipment are incomplete, if there is mechanical damage or defect, or if the
instrument does not pass the electrical performance test, notify the nearest
Agilent Technologies office. Keep the shipping materials for the carrier's
inspection.
Mating Connectors Mating RF input and output connectors used with the attenuators should be:
•Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Type BNC
•Option 001 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Type-N
•Option 005 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Type TNC
For the 355E and 355F, the solenoid drive connector plug is 7-pin male
connector (1251-1037).
Operating
Environment The operating environment of the instrument should be within the following
limitations:
•Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0˚ to +55 ˚C
•Humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <95% relative
•Altitude. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <4,570 m (15,000 ft)
Storage and Shipment Environment
The instrument should be stored in a clean, dry environment. The following
environmental limitations apply to both storage and shipment:
•Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −40˚ C to +75 ˚C
•Humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < 95% relative
•Altitude. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < 7,620 m (25,000 ft)
Original Packaging
Containers and materials identical to original packaging are available from
Agilent Technologies. If the instrument is being returned to Agilent
Technologies, attach a tag indicating the type of service required, return
address, model number, and serial number. Also, mark the container
FRAGILE to assure careful handling. In any correspondence, refer to the
instrument by model number and full serial number.
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VHF Attenuators Operating and Service Manual 9
Operating Instructions
Operating Instructions
CAUTION Do not apply RF power greater than 0.5W average, or 2450W peak with a
maximum pulse width of 200 s. If these limits are exceeded, the attenuator
may be damaged.
Either RF connector may be used as the input or output connector, except in
the case of the 355D/F driven from a low impedance source. This is because
the leaf switch (Figures 1 and 2) may be closed before the microswitch
opens when the dial is switched from 50 dB to 60 dB. Should this occur, a
momentary short is placed across the connector, inviting damage to either
the microswitch or the signal source. Therefore, if the signal source is
subject to damage by a short, use the rear most connector for the input. (The
dial or solenoid connector is at the front of the attenuator.) This pads the
momentary short with 50 dB of isolation. For the 355E and 355F, wire the
solenoid drive plug supplied using Figure 3 as a wiring guide. An
un-energized attenuator solenoid section is 0 dB. Apply +1 5 to +18 Vdc
(with respect to pin H) to energize an attenuator solenoid. A programming
table is also given in Figure 3.
Operator’s Check This section describes the procedures for the operator to make a quick check
of the attenuator prior to use or if a failure is suspected.
NOTE Troubleshooting consists of performing the following Operator's Check. If
the instrument does not perform within limits, return the instrument to the
nearest Agilent Technologies office.
Description
The attenuator is driven from a 50-ohm signal source at 1 kHz. The output
level from the attenuator is detected by a narrow-bandwidth voltmeter (that
is, the SWR meter). The attenuator and detector range switches are stepped
together and the variations in level noted. This verifies that each attenuator
section is being properly switched and checks the low frequency accuracy of
the attenuator.
NOTE The SWR Meter used in this check is calibrated for a square-law detector
and therefore the range changes and errors (read in dB) are twice that
indicated by the meter.
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10 VHF Attenuators Operating and Service Manual
Operating Instructions
Quick-Check Procedures
1. Connect equipment as shown in Figure 4, with the Attenuator set to 0 dB
attenuation.
2. Set Test Oscillator to 0.3 Vrms at 1 kHz.
3. Set the SWR Meter input to XTAL IMPED LOW and the range to 2 dB
(expanded) for 355D or 355F or to 10 dB (with 0 dB expand) for 355C
or 355E. Adjust its bandwidth to the center of the adjustment range.
Fine tune oscillator frequency to obtain the maximum meter indication.
4. Set attenuator and SWR meter range switch as listed in Figure 3, and
verify that the SWR meter indicates within the limits shown.
Figure 4 Operator’s Check Schematic
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VHF Attenuators Operating and Service Manual 11
Operating Instructions
Table 3 Operator’s Checks
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