HP 85052c User Manual
User’s Guide
HP 85052C Precision Calibration Kit
HEWLETT
PACKARD
TRAINING
VIDEOTAPE
USER’S
PRODUCT NOTE
PRODUCT NOTE
CONNECTOR
SERVICE
GUIDE
a510-5A
851 O-8A
CARE CARD
MANUAL
Using the
HP
85052C
HP
85052c
Operating and
Precision
Service Manual
Calibration Kit
HP
85052C
Precision Calibration Kit Operating and Service Package
TABLE OF
CONTENTS
Chapter
1
Introduction to the Calibration Kit
Calibration Kit Components
Air Lines
O-2
GHz
Loads
Reflect Standards
Isolation Standards
Precision Adapters
Tools
5
Chapter 2
Performing a TRL 2-Port Measurement Calibration
Electrostatic Discharge
Clean and Inspect
Cleaning
Using Connector Gages
Configure Port 1 and Port 2
Install Test Port Return Cables
Install Precision Adapters
Air Line Frequency Coverage
Load Calibration Kit Definition
Measure Standards
When Stop Frequency is Greater than 7
GHz
When Start Frequency is Less than 7
GHz
When Start Frequency is Less than 2
GHz
Check the Calibration
11
Chapter 3
Noninsertable Calibrations
General Theory
Noninsertable Device Configurations
Adapter Removal Calibration Procedure
Chapter 4
Other Calibrations
Changing Air Line Frequency Range
Lowband
Reflection Instead of
0 to 2 Loads or 2 to 7 Line
Lowband
Reflection Procedure
26
28
3
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What’s in this Guide
Th*
IS
guide describes how to use the HP 85052C calibration
Chapter 1
Chapter 2
Chapter 3
Chapter 4
User’s Video
Application Note
Service Manual
Before Proceeding.
.
.
kit
with
the HP 8510 vector network analyzer to perform
the TRL 2-Port measurement calibration technique, and
how to evaluate the results of the calibration.
This chapter introduces the components of the kit, and
describes important connection techniques.
In this chapter, detailed sequences describe how to set up
the network analyzer system, and use the kit to perform
the 3.5 mm TRL
~-POX?
Calibration procedure.
Since many applications require measurement of devices
that are not insertable, this chapter describes the theory of
and how to use the kit to perform the Adapter Removal
procedure for measurement of noninsertable devices.
This chapter, entitled “Other Calibrations,” describes use
of the network analyzer Modify Cal Kit function to redefine
the calibration kit and how to use the Lowband Reflection
option.
This guide is supplemented by a video presentation that
shows how an experienced operator uses the calibration kit
parts. If you have access to this tape, view it along with this
manual first.
Another supplement,
Application Note 326, Microwave
Connector Care, gives
general principles of microwave
connector care. With the exception of changing the
recommended connector cleaning fluid from the previously
recommended liquid freon (a CFC) to isopropyl alcohol, this
connector care manual will serve as an excellent starting
point to become familiar with general requirements for
achieving optimum results using this calibration kit.
Refer to the Service Manual for specifications, replaceable
parts, and other pertinent information. Inside the
calibration kit box a quick reference card illustrates
procedures for connecting and disconnecting the air line.
This memory aid is helpful to the operator who is familiar
with the kit and TRL 2-Port calibration theory.
The parts in this kit are delicate and must be handled with
care to avoid damage that would affect the accuracy of the
calibration. Check all test device connectors carefully
before connecting to the TRL adapters.
HP
85052C
Precision Calibration Kit
CHAPTER ON
E
Introduction to the Calibration Kit
The HP 85052C 3.5 mm Precision Calibration Kit is
designed to be used in TRL 2-Port measurement calibration as implemented in vector network analyzers. TRL
stands for Thru-Reflect-Line, naming the main standards
used in the accuracy enhancement procedure.
TRL represents a family of calibration techniques that
measure various combinations of transmission lines and
reflection standards to determine the 2-Port 12-term error
coefficients. The specific calibration technique described
here uses measurements of the zero-length thru connection, identical reflection standards at each port, and one or
more transmission lines of appropriate impedance and
length for the frequency range. Both the TRL 2-PORT and
the Full 2-Port calibration types use the same accuracy
enhancement mathematics to correct the measured data.
TRL, as implemented with this calibration kit, brings convenience, accuracy, and repeatability to the error
correction process because the typical TRL calibration
requires fewer parts that are simpler to connect and
-
disconnect.
The 3.5 mm geometry connector is the most frequently
used connector when frequency coverage up to 26.5
GHz,
reasonable commonality, and durability is desired.
Well constructed connectors and transmission lines can
work up to 34
GHz.
Metrology grade versions of this connector are used for high performance test ports and for
calibration standards. Whether the device uses SMA,
SMA-compatible, or 3.5 mm, the HP 3.5 mm connectors
used on the HP test ports, adapters, cables, and calibration
standards provide the most accurate and repeatable
-
solution.
All male connectors in this kit are HP precision with care-
fully controlled dimensions. All female connectors are of
the HP precision slotless (PSC-3.5) type. These connectors
are designed for long repeatability when used with appropriate technique. This means careful inspection of the kit
parts, familiarity with their use, and careful inspection of
the Device Under Test (DUT) connectors. Refer to the
“Specifications” chapter in the HP
85052C
Service Manual, and the Technical Note included with this manual for
specific information about precision slotless connectors.
5
Calibration
Kit Components
Air Lines
The HP
85052C
3.5 mm Precision Calibration Kit contains
components useful for several different calibration techniques. The parts used for the TRL 2-Port calibration are:
l
Longer precision air line for 2 to 7 GHz
l
Shorter precision air line for 7 to 32 GHz
l
Male and female short circuits
l
Male and female fixed loads
Other parts included are:
l
Three precision TRL adapters
. Two adapter anti-rotation clamps
l
Calibration kit definition tape
l
Male and female open circuits
l
Tools
Note the reference card in the box and the material list on
the bottom of the box.
These are precision air lines. Each one is always stored in
its installation tool to help prevent damage and preserve
cleanliness.
The shorter air line is used for measurement calibration
over the 7 to 32 GHz frequency range. The longer air line is
used for measurement calibration over the 2 to 7
GHz
range. Each air line is fully specified at all frequencies
within its stated range.
7-32
LINE
II
a’
2-7 LINE
Line Standards - 7 to 32
GHz
and 2 to 7
GHz
Air
Lines Installed in Tools with Storage Bottles
Polar Display Showing Phase Response
of
Longer
Air Line Over 2
to
7
GHz
Frequency Range
Polar Display Showing Phase Response of Shorter
Air Line over 7 to 26.5
GHz
Frequency Range
Air Lines Removed From
installation
Tools
Each air line consists of a separate outer conductor and
center conductor and includes its own tool used for
installing and removing the parts from the test port. Both
are insertable. Each has a male end and a female end. The
male end of the air line fits into the installation tool.
The parts may be removed for inspection, if necessary, but
the tool is always used to install the parts for calibration.
Use extreme care in handling these parts. Use static dissipative finger sheaths, or “finger cots” to prevent contamination. Liquid or solid residue on the connector parts will
degrade performance. In particular, the inner conductors
can be easily deformed by squeezing. Do not use
metallic
tweezers or other devices to pick up or hold the parts.
installing
the
Air
Lines in
installation
Tools
0 to 2
GHz
Loads
Th’
IS
implementation of the TRL 2-Port calibration allows
measurement of the loads to determine the error coefficients up to 2
GHz.
Technically, the measurement is
treated as an infinite-length transmission line whose input
reflection is the reference impedance, Z,.
Note:
The male and female broadband loads are
manufactured to tolerances that assure equivalent responses,
at least below 2
GHz.
If one is damaged or otherwise
becomes defective, calibration
erroriwill
result.
0
to 2
GHz
Loads -Male and Female Fixed Broadband Loads
Reflect Standards
Reflect Standards -Male and Female Short Circuits
Isolation Standards
isolation
Standards -Male and Female Broadband Loads
Precision Adapters
In this TRL 2-Port calibration, the reflect standards are
identical short circuits with one connected to Port 1 and
one to Port 2.
The male short circuit and the female short circuit are
manufactured to tolerances that assure equivalent
responses. If one is damaged or otherwise becomes
defective, calibration errors will result. Errors will also
result if the open circuits are used in the procedure instead
of the short circuits (unless the calibration kit standard
assignment definition is changed).
The fixed loads used for the isolation part of the calibration
are the same broadband loads as used for the O-2 loads
measurement. Exact equivalent responses are not required
for this step.
Three precision adapters are included in this kit. Two are
always recommended for the 3.5 mm TRL 2-Port
measurement calibration. All three can be used in the
adapter removal calibration for measurement of nonin-
sertable devices. Complete performance verification
assumes use of the precision adapters in this kit as the test
ports.
MALE to FEMALE
MALE to MALE
FEMALE to FEMALE
Precision
TRL
test port adapters
Recession Limits
The female receptacle recession and the male pin
recession, along with other mechanical specifications of
Port 1 and Port 2, must be within limits to meet complete
measurement specifications. The precision adapters
supplied in this kit are manufactured to metrology
standards in order to obtain the best measurement
accuracy specifications. If other connectors than these
precision adapters are used as the test ports, they must be
fully inspected. Using other than the highest quality
connectors as the test ports will reduce accuracy and
repeatability as well as possibly damaging the calibration
standards.
Precision Connectors
For general use, any 3.5 mm precision
slotless
female connector can be used for the female test port. The 3.5 mm
precision male connector used on the male end of these
adapters is always required for measurements between
7-32 GHz in order to connect the 7-32 GHz air line in this
kit. Any 3.5 mm precision male connector can be used at
frequencies less than 7
GHz.
hstdation
Feature
The precision adapter male connector has a special feature
to allow installation of the 7-32 air line.
GAP
_L
t
l
Grasp the knurled sleeve and move the nut to its
extended position by pulling on it.
This is the position used for measurement of the 7-32 GHz
air line.
Extended Position
GAP
. Now move the sleeve forward and push the nut back
into its standard position.
This position is used to install the short air line, for
connecting the other calibration standards, and for
connecting the device under test.
Standard Position
9
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