HP 85325A, 85326A Operating And Service Manual
HP 85325A R/Q/U/V/W Millimeter Subsystem HP 85326A Millimeter-Wave Interface Kit
Operating and Service Manual
HP 85325A R/Q/U/V/W Millimeter
Subsystem
HP 85326A Millimeter-Wave Interface Kit
Operating and Service
Manual
HP part number: 85325-90061
Printed in USA
08 December 1998
Edition 2.0
Notice
The information contained in this document is subject to change without
notice.
Hewlett-Packard 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. Hewlett-Packard 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.
Hewlett-Packard assumes no responsibility for the use or reliability of its
software on equipment that is not furnished by Hewlett-Packard.
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 Hewlett-Packard Company.
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.
Hewlett-Packard Company
Santa Rosa Systems Division
1400 Fountaingrove Parkway
Santa Rosa, CA 95403-1799, U.S.A.
© Copyright Hewlett-Packard Company 1998
iv
HP 85325A Operating and Service Manual
What You’ll Find in This Manual…
Chapter 1 • Installation
Chapter 2 • Operation
Chapter 3 • General Information
Chapter 4 • Performance Verification
Chapter 5 • Timebase Check and Adjustment
Chapter 6 • Service
Appendix A • Using the HP 8340/41 in Your System
Appendix B • Connecting the Waveguide Properly
HP 85325A Operating and Service Manual
v
Warranty
Certification Hewlett-Packard Company certifies that this product met its published
specifications at the time of shipment from the factory. Hewlett-Packard
further certifies that its calibration measurements are traceable to the
United States National Institute of Standards and Technology (NIST,
formerly NBS), to the extent allowed by the Institute’s calibration facility,
and to the calibration facilities of other International Standards
Organization members.
Warranty This Hewlett-Packard system product is warranted against defects in
materials and workmanship for a period corresponding to the individual
warranty periods of its component products. Instruments are warranted for a
period of one year. During the warranty period, Hewlett-Packard Company
will, at its option, either repair or replace products that prove to be defective.
Warranty service for products installed by HP and certain other products
designated by HP will be performed at Buyer’s facility at no charge within
HP service travel areas. Outside HP service travel areas, warranty service
will be performed at Buyer’s facility only upon HP’s prior agreement and
Buyer shall pay HP’s round trip travel expenses. In all other areas, products
must be returned to a service facility designated by HP.
For products returned to HP for warranty service, Buyer shall prepay
shipping charges to HP and HP shall pay shipping charges to return the
product to Buyer.However,Buyer shall pay all shipping charges, duties, and
taxes for products returned to HP from another country.
HP warrants that its software and firmware designated by HP for use with an
instrument will execute its programming instructions when properly
installed on that instrument. HP does not warrant that the operation of the
instrument, or software, or firmware will be uninterrupted or error free.
LIMITATION OF WARRANTY. The foregoing warranty shall not apply
to defects resulting from improper or inadequate maintenance by Buyer,
Buyer-supplied software or interfacing, unauthorized modification or
misuse, operation outside of the environmental specifications for the
product, or improper site preparation or maintenance.
NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. HP
SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OR
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
EXCLUSIVE REMEDIES. THE REMEDIES PROVIDED HEREIN ARE
BUYER’S SOLE AND EXCLUSIVE REMEDIES. HP SHALL NOT BE
LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR
vi
HP 85325A Operating and Service Manual
CONSEQUENTIAL DAMAGES, WHETHER BASED ON CONTRACT,
TORT, OR ANY OTHER LEGAL THEORY.
Assistance Product maintenance agreements and other customer assistance agreements
are available for Hewlett-Packard products.
For assistance, call your local Hewlett-Packard Sales and Service Office
(refer to “Service and Support” on page viii).
HP 85325A Operating and Service Manual
vii
Service and Support
Any adjustment, maintenance, or repair of this product must be performed
by qualified personnel. Contact your customer engineer through your local
HP Service Center. You can find a list of HP Service Centers on the web at
http://www.hp.com/go/tmdir.
If you do not have access to the Internet, one of these HP centers can direct
you to your nearest HP representative:
United States: Hewlett-Packard Company
Test and Measurement Call Center
PO Box 4026
Englewood, CO 80155-4026
(800) 452 4844 (toll-free in US)
Canada: Hewlett-Packard Canada Ltd.
5150 Spectrum Way
Mississauga, Ontario L4W 5G1
(905) 206 4725
Europe: Hewlett-Packard European Marketing Centre
Postbox 999
1180 AZ Amstelveen
The Netherlands
(31 20) 547 9900
Japan: Hewlett-Packard Ltd.
Measurement Assistance Center
9-1, Takakura-Cho, Hachioji-Shi
Tokyo 192, Japan
(81) 426 56 7832
(81) 426 56 7840 (FAX)
Latin America: Hewlett-Packard Latin American Region Headquarters
5200 Blue Lagoon Drive, 9th Floor
Miami, Florida 33126, U.S.A.
(305) 267 4245, (305) 267-4220
(305) 267 4288 (FAX)
Australia/New Zealand: Hewlett-Packard Australia Ltd.
31-41 Joseph Street
Blackburn, Victoria 3130
Australia
1 800 629 485 (Australia)
0800 738 378 (New Zealand)
(61 3) 9210 5489 (FAX)
Asia-Pacific: Hewlett-Packard Asia Pacific Ltd.
17-21/F Shell Tower, Times Square
1 Matheson Street, Causeway Bay
Hong Kong
(852) 2599 7777
(852) 2506 9285 (FAX)
viii
HP 85325A Operating and Service Manual
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
Instrument Markings
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.
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 instrument is an Industrial Scientific and Medical Group 1
Class A product (CISPER 11, Clause 4).
This symbol indicates that the power line switch is ON.
This symbol indicates that the power line switch is OFF or in STANDBY position.
HP 85325A Operating and Service Manual
ix
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.
BeforeApplying 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.
x
HP 85325A Operating and Service Manual
Declaration of Conformity
This is to certify that this product meets the radio frequency interference
requirements of Directive FTZ 1046/1984. The German Bundespost has
been notified that this equipment was put into circulation and has been
granted the right to check the product type for compliance with these
requirements.
If test and measurement equipment is operated with unshielded cables
and/or used for measurements on open set-ups, the user must insure that
under these operating conditions, the radio frequency interference limits are
met at the border of his premises.
Model HP 85325A and Model HP 85326A
Hiermit wird bescheinigt, dass dieses Gert/System in bereinstimmung mit
den Bestimmungen von Postverfgung 1046/84 funkentst"rt ist.
Der Deutschen Bundespost wurde das Inverkehrbringen dieses
Gertes/Systems angezeight und die Berechtigung zur berprfung der Serie auf
Einhaltung der Bestimmungen eingerumt.
Zustzinformation fr Mess-und Testgerte:
Werden Mess- und Testgerte mit ungeschirmten Kabeln und/oder in offenen
Messaufbauten verwendet, so ist vom Betreiber sicherzustellen, dass die
Funk-Entst"rbestimmungen unter Betriebsbedingungen an seiner Grundstcksgrenze eingehalten werden.
HP 85325A Operating and Service Manual
xi
Typeface Conventions
Italics • Used to emphasize important information:
Use this software only with the HP xxxxxX system.
• Used for the title of a publication:
Refer to the HP 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 HP xxxxxX will display the message
CAL1 SAVED.
[Keycap]
{Softkey}
User Entry • Used to indicate text that you will enter using the computer keyboard;
• Used for labeled keys on the front panel of an instrument or on a
computer keyboard:
Press
[Return]
.
• Used for simulated keys that appear on an instrument display:
Press
{Prior Menu}
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
Computer Display
• Used for a subdirectory name or file path:
Edit the file
usr/local/bin/sample.txt
• 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.
xii
HP 85325A Operating and Service Manual
Contents
1. Installation
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Table 1-1. Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Initial Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Figure 1-1. Initial Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Using an HP 8340/41 RF Source . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Connecting the Waveguide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Optional 10 MHz Reference Connection . . . . . . . . . . . . . . . . . . . . . 1-4
Checking the Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Receiver Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Setting Up the Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Table 1-2. DENOM Value Table . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Table 1-3. Multiplier DENOM Table . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Mixer LO Power Level Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Initial Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Initial Fixed Attenuator Value Selections . . . . . . . . . . . . . . . . . . . . . 1-8
Table 1-4. Selecting HP 85326A Reference and Test Attenuation . . 1-9
How to Use the Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
Changing Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
Figure 1-2. Reference Attenuator Installation . . . . . . . . . . . . . . . . 1-10
Figure 1-3. Test Attenuator Installation . . . . . . . . . . . . . . . . . . . . 1-10
Adjustment Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
Procedure 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
Figure 1-4. Measuring LO Power from the Reference Module . . . 1-11
Figure 1-5. Reference Mixer Connections . . . . . . . . . . . . . . . . . . . 1-12
Figure 1-6. LO Power Measurement Point for Test Module . . . . . 1-13
Procedure 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
Mixer Operational Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
Figure 1-7. Test Mixer Connections . . . . . . . . . . . . . . . . . . . . . . . 1-17
When Using an HP 8350 LO Source . . . . . . . . . . . . . . . . . . . . . . . 1-18
Saving the Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
Final Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
Figure 1-8. Leveling Control Cables . . . . . . . . . . . . . . . . . . . . . . . 1-20
Figure 1-9. HP 85325A/85326A Installation Block Diagram
(Coupled Reference) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21
Figure 1-10. HP 85325A/85326A Visual Installation Diagram
(Coupled Reference) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22
Figure 1-11. HP 85325A/85326A Installation Block Diagram
(Radiated Reference) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23
If Using an HP 8340/41 RF Source . . . . . . . . . . . . . . . . . . . . . . . . 1-23
Connecting the Waveguide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23
HP 85325A Operating and Service Manual
Contents-i
Proper Torque for Coax Connections . . . . . . . . . . . . . . . . . . . . . . . 1-24
Table 1-5. Proper Connector Torque . . . . . . . . . . . . . . . . . . . . . . . 1-24
Turn ON AC Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24
2. Operation
Mixer Operating Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Maximum RF Input Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Maximum LO Input Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Required LO Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Connector Care . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Proper Waveguide Connector Alignment . . . . . . . . . . . . . . . . . . . . . 2-2
3. General Information
Chapter Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
About Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Table 3-1. R, Q, and U Band System Level Specifications . . . . . . . . 3-2
Table 3-2. V and W Band System Level Specifications . . . . . . . . . . . 3-3
MM-Wave Source and Mixer Characteristics . . . . . . . . . . . . . . . . . . . . . 3-4
Table 3-3. MM-Wave Source Information . . . . . . . . . . . . . . . . . . . . 3-4
Table 3-4. MM-Wave Mixer Information . . . . . . . . . . . . . . . . . . . . . 3-4
Supplied Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Table 3-5. Supplied Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Maximum RF Cable Lengths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Figure 3-1. L
, LR, and LT Cables . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
S
Table 3-6. Maximum Cable Lengths (meters) . . . . . . . . . . . . . . . . . 3-6
Formulas for Cable Length Maximums . . . . . . . . . . . . . . . . . . . . . . 3-7
Figure 3-2. L
, LR, LT Cable Lengths, Example . . . . . . . . . . . . . . . . 3-7
S
4. System Performance Verification
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Recommended Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Non-Banded Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Table 4-1. Recommended Test Equipment (non-banded) . . . . . . . . . 4-2
Band-Dependent Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Table 4-2. Recommended Test Equipment (banded) . . . . . . . . . . . . 4-3
Transmitter Performance Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Receiver Performance Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
First Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Second Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Setting Up The Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Table 4-3. Proper Connector Torque . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Figure 4-1. Initial Equipment Configuration . . . . . . . . . . . . . . . . . . 4-8
Table 4-4. Switch Positions for Analyzer Mode . . . . . . . . . . . . . . . . 4-9
Install the Performance Verification Software Onto a Hard Disk . . . . . 4-10
Copy Onto a Hard Disk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
Starting The Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
Contents-ii
HP 85325A Operating and Service Manual
Softkey Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
Loading the Program From a Hard Disk . . . . . . . . . . . . . . . . . . . . 4-11
Running the Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
Helpful Hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13
Detailed Test Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15
CW Frequency Accuracy Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15
Maximum Leveled Power Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15
RF to IF Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15
IF Noise Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15
Channel Crosstalk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15
Compression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16
5. Synthesized LO Source Timebase Check and Adjustment
Description and Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Table 5-1. Suggested Adjustment Interval for LO Sources . . . . . . . 5-1
Figure 5-1. LO Source 10 MHz Timebase Adjustment Setup . . . . . 5-2
Figure 5-2. 10 MHz Standard Adjustment Location . . . . . . . . . . . . 5-3
6. Service
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Figure 6-1. System Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Transmitter Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
The Purpose of Each Device in the Transmitter Section . . . . . . 6-3
Allowable HP-IB Cable Lengths . . . . . . . . . . . . . . . . . . . . . . . . 6-3
Extender Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
Receiver Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
Purpose of Each Device in the Receiver Section . . . . . . . . . . . . 6-4
Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
Recommended Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
Non-Banded Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
Table 6-1. Recommended Test Equipment (Non-Banded) . . . . . . . . 6-7
Band-Dependent Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
Table 6-2. Recommended Test Equipment (Banded) . . . . . . . . . . . . 6-8
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9
Special 5/16 Inch Wrench . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9
Replaceable Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10
How to Order Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10
MM-Wave Module Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11
Test Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11
Table 6-3. Test Module (85326-60001)Parts . . . . . . . . . . . . . . . . . 6-11
Figure 6-2. HP 85326A (85326-60001) . . . . . . . . . . . . . . . . . . . . 6-11
When Replacing a Diplexer . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11
Reference Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12
Table 6-4. Reference Module (85326-60002)Parts . . . . . . . . . . . . 6-12
Figure 6-3. HP 85356A (85326-60002) . . . . . . . . . . . . . . . . . . . . 6-12
Band-Related Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-13
HP 85325A Operating and Service Manual
Contents-iii
Table 6-5. Parts Supplied in Specific Bands . . . . . . . . . . . . . . . . . . 6-13
Repairing a Mixer or Source Module . . . . . . . . . . . . . . . . . . . . 6-13
Miscellaneous Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-14
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-14
Table 6-6. Miscellaneous Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-14
7. Using the HP 8340/41 in Your System
Figure A-1. HP 8340/41 RF Source . . . . . . . . . . . . . . . . . . . . . . . . . A-1
8. Connecting the Waveguide Properly
Handling and Storing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Connecting WR-62 Waveguide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Wear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Visual Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Precision Flanges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
Figure B-1. Alignment Holes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
Aligning Two Precision Flanges . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3
Figure B-2. Inserting Slip Rings . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3
Figure B-3. Align Flanges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3
Figure B-4. Inspect Flange Connections . . . . . . . . . . . . . . . . . . . . . B-4
Aligning Precision and Non-Precision Flanges . . . . . . . . . . . . . . . . B-5
Figure B-5. Align Pin with Head . . . . . . . . . . . . . . . . . . . . . . . . . . . B-5
Figure B-6. Tighten Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-5
Contents-iv
HP 85325A Operating and Service Manual
Installation
1
Installation
This chapter explains how to:
• set up the equipment
• adjust LO power levels
• check mixer operation
• perform final installation
WARNING This equipment is capable of radiating millimeter-wave energy from the end of
an unterminated waveguide. Do not look directly into the open end of any
waveguide when it is connected to a source of millimeter-wave energy.
Take precautions consistent with ANSI C95.1 - 1982, a study performed by the
American National Standards Institute that sets limits for human exposure to
microwaveand millimeter-wave energy. Copies of this publication are available
from:
CAUTION
American National Standards Institute
11 West 42 Street
New York, New York 10036
Telephone: (212) 642-4900
WEB site: www.ansi.org
Do not connect LO power to the HP 11970 mixers until you adjust the LO
power in “Mixer LO Power Level Adjustment” on page 1-8. If you connect
LO power before adjusting it you could permanently damage the mixers.
HP 85325A Operating and Service Manual
1-1
Installation
Required Equipment
Required Equipment
The following equipment is required when performing installation.
Table 1-1 Equipment Required
Item Qty HP Model or Part Number
Power Meter 1 HP 436, 437, or 438
Power Sensor 1 HP 8485A
5/16 inch Wrench 1 08555-20097 (supplied with HP 85326A)
T-10 Torx Driver 1 8710-1623 (supplied with HP 85326A)
1/4 inch Wrench 1 8710-0510 (supplied with HP 85325A)
3/16 inch Wrench 1 8710-0013 (supplied with HP 85325A)
3/32 Hex Ball Driver 1 8710-1539 (supplied with HP 85325A)
Adapter, 3.5 mm (f) to (f) 1 1250-1749
1-2
HP 85325A Operating and Service Manual
Initial Setup
Connect the equipment as shown in Figure 1-1.
Installation
Initial Setup
Figure 1-1 Initial Setup
NOTE
Using an HP 8340/41 RF Source
Connecting the Waveguide
It is important that you connect the mm-wave head to the RF source (as
shown in Figure 1-1) before using the procedures in this manual. The
mm-wave head configures the RF source so it will accept mm-wave band
start and stop frequency commands from the receiver.
If you are using an HP 8340/41 as an RF source, refer to Appendix A for
setup information.
When connecting the waveguide, refer to Appendix B, “Connecting the
Waveguide Properly.” Use the waveguide accessory hardware kit when
connecting the waveguide components.
HP 85325A Operating and Service Manual
1-3
Installation
Initial Setup
Optional 10 MHz Reference Connection
NOTE
Procedure 1. Set up the sources so that they are not under HP 8530 control.
The 10 MHz reference connection (see Figure 1-1 on page 1-3) between the
RF and LO sources locks the signal frequency of the two sources together.
When the sources are separated by a long distance, make sure the 10 MHz
signal is at least -17 dBm or greater at the 10 MHz REF INPUT. The
10 MHz REF OUTPUT produces 0 dBm.
Checking the Signal
You can check to see if a 10 MHz signal is reaching the destination source as
follows:
This procedure assumes at least one source has a front panel.
2. Connect the 10 MHz cable between the LO and RF source 10 MHz REF
jacks. Make sure you use the 10 MHz REF IN on the source with a front
panel. (This will be called the receiving unit.)
3. Preset the sources.
4. If
EXT REF is displayed on the bottom-left of the receiving units display,
the signal is satisfactory.
1-4
HP 85325A Operating and Service Manual
Receiver Settings
Installation
Receiver Settings
NOTE [[Brackets]
Setting Up the Receiver
{Braces}
1. Turn ON the RF source. Make sure it is set to HP-IB address 19.
2. Turn ON the LO source. Make sure it is set to HP-IB address 18.
indicate a display softkey selection.
3. Turn ON the following components in the order shown: a. RF power amplifier (if used) b. HP 85309A c. Receiver
NOTE
If your LO source is an HP 8350, it is normal for
to appear on the screen at this time. The message will go away later, when
you connect the reference mixer.
4. Press:
indicate a front-panel key or on a computer key board.
CAUTION, NO IF FOUND or
CAUTION: SOURCE 1 FAILURE RF UNLOCKED
[USER PRESET]
[SYSTEM]
{HPIB ADDRESSES}
{SOURCE #2}
[1][8] [x1]
5. If using an HP 8510, press:
6. If using an HP 8530, press:
(sets address of the LO source)
{TEST SET}
{CONVERTER} {SET ADDRESS}
Press:
[RECALL]
{MORE} {FACTORY PRESET}
Press:
[SYSTEM]
{MORE} {SYSTEM PHASELOCK}
a. If using a synthesized LO, select
b. If using an HP 8350 source, select
[3][1] [x1]
[3][1] [x1]
{LOCK TYPE: NONE}
{LOCK TYPE: EXTERNAL}
.
.
HP 85325A Operating and Service Manual
1-5
Installation
Receiver Settings
7. Press:
NOTE
I In some setups,
{SOURCE 1: INTERNAL}
[PRIOR MENU]
{POWER LEVELING}
{SOURCE 1: MM MODULE LEVELING}
{SOURCE 1: MM MODULE LEVELING}
is not appropriate. Select
if:
❍ Using an HP 8510B
❍ Using an HP 8510C with firmware Revision 6.1 or lower.
❍ The source interface cable is not connected to the HP 836xx.
❍ Using an HP 8340/41, and it is not connected as shown in
Appendix A.
8. Press:
{SOURCE 2: INTERNAL}
[PRIOR MENU]
{EDIT MULT. SRC.}
9. Press:
{DEFINE: SOURCE #1}
{MULTIPLIER NUMER.}
10. Press
{MULTIPLIER DENOM.}
a. If source 1 (the RF source) is an HP 836xx, and the source interface
cable is connected: press
b. If source 1 is an HP 836xx and the source interface cable is not
connected, enter the DENOM. value for your band (shown in
Table 1-2), remember to terminate with
Table 1-2 DENOM Value Table
Band DENOM Value Start Freq (GHz) Stop Freq (GHz)
[1] [x1]
and do one of the following:
[1] [x1]
[x1]:
R 2 26.5 40
Q 3 33 50
U 3 40 60
V 4 50 75
W 6 75 110
1-6
HP 85325A Operating and Service Manual
Receiver Settings
c. If source 1 is an HP 8340/41, enter the DENOM value (in Table 1-2
on page 1-6) for your band. Terminate with
[x1]
.
11. Press:
Installation
{OFFSET FREQUENCY}
{DONE}
[0] [x1]
12. Press:
{DEFINE: SOURCE #2}
{MULTIPLIER NUMER.}
13. Press
{MULTIPLIER DENOM.}
[1] [x1]
remember to terminate with
Table 1-3 Multiplier DENOM Table
Band DENOM Value Start Freq (GHz) Stop Freq (GHz)
R 8 26.5 40
Q103350
U104060
V145075
W1875110
, and enter the value (shown in Table 1-3),
[x1]:
14. Press:
{OFFSET FREQUENCY}
{DONE}
15. Press:
16. Press:
{RECEIVER}{CONSTANT FREQUENCY}
{DONE} {MULT. SRC: ON / SAVE}
17. Press STIMULUS
{POWER SOURCE 1}
{POWER SOURCE 2}
[PRIOR MENU]
{STEP}
18. Enter the start and stop frequencies using the
[2][0] [MHz]
[MENU]
[0] [x1]
[1][0] [x1]
[2][0] [MHz]
{POWER MENU}
[START]
and
[STOP]
the start/stop frequencies shown in Table 1-2 for your specific mixer.
keys. Use
HP 85325A Operating and Service Manual
1-7
Installation
Mixer LO Power Level Adjustment
Mixer LO Power Level Adjustment
NOTE [Brackets]
{Braces}
CAUTION
It is critical that you set LO power before connecting the HP 11970 mixers.
indicate a front-panel key or a computer key board.
indicate a display softkey selection.
Initial Setup 1. If using an HP 8530A, press:
Initial Fixed Attenuator Value Selections
[DOMAIN]
2. Place the receiver in the single point (CW) mode by pressing: STIMULUS
3. Press
millimeter band.
The internal fixed attenuator value in the reference module is set so the
mixer LO input port is not damaged by excessive power (maximum power
for an HP 11970x is +20 dB). The maximum unleveled power is possible if
the ALC loop of the HP 85309A and reference module is broken.
{FREQUENCY}
[MENU]
[CENTER]
and enter the lowest frequency available in your
,
{SINGLE POINT}
.
NOTE
To check what the maximum unleveled power level is:
1. Disconnect the detector voltage feedback cable at the reference module
while monitoring the power level as shown in Figure 1-4 on page 1-11.
Perform the test within the frequency range of operation.
2. Install an attenuator in the reference module which has a value that
keeps the power level below your mixers damage level. (See Figure 1-2
on page 1-10)
The attenuator values shown in Table 1-4 on page 1-9 can be used if
HP 85381A RF cable assemblies are used.
3. Determine the minimum attenuator value for the 85326-60001 (test
module), and the 85326-60002 (reference module) using Table 1-4 on
page 1-9.
1-8
HP 85325A Operating and Service Manual
Mixer LO Power Level Adjustment
Table 1-4 Selecting HP 85326A Reference and Test Attenuation
Installation
Length of LO Cable from
HP 85309A
(LV Cable)
9 meters 0 dB 0 dB
8 meters 1 dB 0 dB
7 meters 1 dB 1 dB
6 meters 2 dB 1 dB
5 meters 2 dB 2 dB
4 meters 3 dB 2 dB
1.5 to 3 meters 3 dB 3 dB
1. Assumes use of HP 85381A cable type.
2. A standard HP 85325A system uses 8, 6, or 4 meter cables.
1
to Reference Module
Reference Module
2
Attenuation Required
Test Module Attenuation
Required
How to Use the Chart
Determine the length of the LO cable that goes from the HP 85309A REF
LO OUT connector to the reference module's LO IN connector.
Look the length up in Table 1-4 to find the appropriate amount of attenuation
for the test and reference modules.
Procedure
HP cables have label sleeves marked C04, C06, or C08. The number
represents the length of the cable in meters. Standard systems use LO cables
that are 4, 6, or 8 meters in length. Other lengths are not standard but might
apply to special systems.
Changing Attenuation
1. Use the supplied #10 TORX driver to remove the screws securing the module covers.
2. Observe the attenuator that is connected to the reformable cable. Hold
the body of this attenuator in place with one of the supplied 5/16 inch
wrenches.
3. Use the other 5/16 inch wrench to disconnect the reformable cable.
4. Remove other attenuators, as required, using this method.
5. Place unused attenuators in the holders (see Figure 1-2 and Figure 1-3
on page 1-10.)
6. Replace the reformable cable.
HP 85325A Operating and Service Manual
1-9
Installation
Mixer LO Power Level Adjustment
7. Make sure the connections inside the module are secure before replacing
the module covers (8 to 10 in-lbs of torque is recommended).
8. Replace the module covers and screws. Tighten the screws until they are
snug. Do not over-tighten.
Figure 1-2 Reference Attenuator Installation
Figure 1-3 Test Attenuator Installation
1-10
HP 85325A Operating and Service Manual
Adjustment Procedures
Installation
Adjustment Procedures
NOTE [Brackets]
{Braces}
LO power must be adjusted before connecting the HP 85325A mixers to
avoid damaging them. Use Procedure 1 or 2, as appropriate:
indicate a front-panel key on a computer keyboard.
indicate a display softkey selection.
• Procedure 1
Use this procedure if you are only going to use the HP 85325A/HP
85325A mixer configuration.
• Procedure 2
Use this procedure if you are going to reconfigure your system between
HP 85325A/HP 85326A mixers and other mixer types. Procedure 2
eliminates the need to readjust LO power when switching between the
HP 85325A and other mixers.
Procedure 1 This procedure applies to systems that only use HP 85325A mixers.
Initial Setup 1. Zero and calibrate the power meter (refer to your power meter manual).
2. Determine the power sensor calibration factor at 4 GHz, and set the power meter accordingly.
3. Connect the power meter as shown in Figure 1-4.
Figure 1-4 Measuring LO Power from the Reference Module
4. Measure the power output of the reference module as shown in
Figure 1-4. Be sure to measure power at the end of the LO cable.
HP 85325A Operating and Service Manual
1-11
Installation
Adjustment Procedures
Adjust the LO Power to
the Reference Mixer
NOTE
1. Adjust the HP 85309A front panel LO POWER ADJUST control until
the power meter reads between 17 and 17.8 dBm. The “LO POWER
OUT OF RANGE” light should be off.
2. Note the reading of the HP 85309A display and write it down here:
HP 85326A DETECTOR VOLTAGE SETTING:______________ millivolts
If the LO power adjust setting is ever changed, you can return to the
appropriate power level for the millimeter system by referring to this setting.
To return to the original power level, Turn the LO POWER ADJUST knob
until the voltage reading matches the value written above.
To find the maximum unleveled power, disconnect the detector voltage
feedback cable at the reference module while monitoring the power level as
shown in Figure 1-4 on page 1-11. Remember to perform the test within the
frequency range of operation.
When performing the following step, connect the LO, IF, and detector
voltage cables to the reference MODULE first, then connect cables to the
mixer. This lowers the risk of electrostatic damage to the mixers.
3. Connect the reference mixer to the reference module and directional coupler, refer to Figure 1-5.
The warning beeper should now stop.
4. Press
[ENTRY OFF]
to remove the error message from the receiver display.
Figure 1-5 Reference Mixer Connections
1-12
HP 85325A Operating and Service Manual
Installation
Adjustment Procedures
Adjust the LO Power to
the Test Mixer
Figure 1-6 LO Power Measurement Point for Test Module
1. Zero the power meter.
2. Measure the LO power output of the test module as shown in Figure 1-6.
3. The LO power should be between +16 and +17 dBm. If the LO power is
outside this range, you must change the amount of attenuation inside the
test module. This is accomplished by adding or removing attenuators
inside the module.
Use various combinations of the 1, 2, and 4 dB attenuators to adjust the
LO power to the required range.
4. If you have more than one test module, repeat power measurement for
each test channel module as explained above.
HP 85325A Operating and Service Manual
1-13
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