HP 85021 A User manual

85021A/B/C
DIRECTIONALBRIDGE
SERIAI, NUMBERS
This manual applies directly to the HP Model
85021A/B/G Directional Bridge with serial
numbers prefixed as follows:
Model Serial Ptefix
85021A 2312A
850218 2309A
85021C 2314A
With changes described in Section VII, this
manual also applies to instruments with serial
numbers prefixed as follows:
85021A 2301A, 2308A
85021C 2311A
For additional information about serial
numbers, refer to INSTRUMENTSCOVEREDBY
MANUAL in Section I.
@Copyright HEWLETT-PACKARDCOMPANY 1983
1400 FOUNTAIN GROVEPARKWAY,SANTA ROSA, CA 95404, U.S.A.
MANUAL PART NO. 85021-90019
Microfiche Part No. 85021-90020 Printed: OCTOQER 1933
HEWLETT
PACKARD

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.

General Infonna,ti,vn Model 8502lA/B/C:

Model85021A/B/G GeneralInformation
The 85021A/B/G microwave Directional Bridges contain microcircuits
that are hiqhly sensitive to electrostatic discharqe (ED). Damaqe
from ESD is most 1ikel.v to occur as the bridges are connected or
disconnected. The surest method of protecting the ES02lA/R/C is
for the operator to wear a groundinq strap that provides a path to
qround of no less than 1 Meqahm and no more than 2.5 Meqohms.
Alternatively the operator can qround himself before touchina the
bridqe connectors, by touching any grounded instrument chassis.
Never touch the center contacts of the connectors.
Tests at Hewlett-Packard have revealed that repeated ESD charqes
as low as 250 volts can destroy microwave diodes. Ordinary
activities around everyday materials can qenerate ESD voltaqes of
tens of thousands of volts. Materials conducive to static build-up
include floor carpeting, nylon clothing, dry air, pa?er, adhesive
tape, Styrofoam, and vinyl. IJse of the precautions described here
will considerably reduce the probability of damaqe from ESD.
For service purposes, a work station equipped with an anti-static
surface must be used. Use only anti-static solder removers and
grounded soldering irons. Some replacement parts may be shinned in
static-protective packaqinq: remove the parts from this aackaginq
only at an anti-static work station while wearinq the qrounded
wrist strap. All anti-static safequards should conform to state
and federal safety standards.

General Information Model85021A/B/C
@
-.
&w-e I-2. Model.~RliO2/A. 8502lB,
and 85021 C Directional Bridges
I

GeneralInformation
SECTION I
GENERAL INFORMATION
l-1. fNTRODUCTION
l-2, This manual contains operatinq and service information for
the Hewlett-Packard Models 85021~, 85n21B, and 85021C Microwave
Directional Bridges. Section I includes specifications and
supplemental performance characteristics, safetv considerations,
instrument identification, description, and other basic
information. Fiqure l-l shows the Model 85021A in the accessory
instrument case supplied with each instrument. Figure 1-2 shows
all three Directional Bridqes.
1-3. On the title page of this manual is a microfiche part
number. This number mav be used to order lo- bv 15-centimeter (4-
by 6-inch) microfilm transparencies of the manual, Each microfiche
contains up to 60 photo duplicates of the manual pages. The
microfiche packaqe also includes the latest Manual Changes
supplement as well as all pertinent Service Notes,
l-4. Refer any questions regarding this manual, the Manual
Changes supplement, or the instrument to the nearest HP
Sales/Service Office. Always identify the instrument bv model
number, complete name, and complete serial number in all
correspondence. Refer to the inside rear cover of this manual for
a worldwide listinq of HP Sales/Service Offices.
l-5. SPECfFfCATIONS
1-6. Specifications for the 85021A/B/G are listed in Table I-I.
These specifications are performance standards or limits against
which the instrument may be tested. Table 1-2 3.ists supplemental
characteristics. These are not specifications but are intended to
provide information useful in applvinq the instrument hV qivina
typical but non-warranted performance parameters.
1-7. SAFETY CONSIDERAT'XONS
l-8.
The voltaqes nresent in the 85021A/B/G are not in a range to
warrant more than normal caution.
The CAUTION sign in this manual calls