Keysight N4697J Service manual

Keysight N4697J/K
NMD-1.85 mm -f- to 1.85 mm
Flexible Test Port Return Cables
Operating and
Service Manual

Notices
© Keysight Technologies, Inc. 2018
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Trademark Acknowledgments
Manual Part Number
N4697-90010
Edition
Edition 1, November 2018
Printed in USA/Malaysia
Published by:
Keysight Technologies
1400 Fountaingrove Parkway
Santa Rosa, CA 95403
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Contents
Keysight N4697J/K Operating and Service Manual 3
Table of Contents
1. General Information
The Cable Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
N4697J . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
N4697K . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Connectors Designators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Clarifying the Terminology of a Connector Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Incoming Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Replaceable Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Printing Copies of Documentation from the Web . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
2. Specifications
Environmental Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Supplemental Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Center Conductor Pin Depth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
3. Use, Maintenance, and Care of the Cables
Electrostatic Discharge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Visual Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Look for Obvious Defects and Damage First . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Inspect the Mating Plane Surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Connector Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Concentricity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Inspect Female Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Cleaning Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Gaging Connectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Connector Gage Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
When to Gage Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Gaging Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
Making a Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
Separating a Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
Handling and Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
Avoiding Cable Movement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
4. Replaceable Parts
Ordering Replaceable Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

4 Keysight N4697J/K Operating and Service Manual
Contents
Ordering One Cable in a Cable Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Returning a Cable or Cable Set to Keysight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Information About Network Analyzers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
A:.Connector Care Quick Reference
Principles of Microwave Connector Care . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-1

1-1
Keysight N4697J/K
Ruggedized-1.85 mm -f- to 1.85 mm Flexible Test Port Return Cables
Operating and Service Manual
1 General Information
The Cable Sets
The Keysight N4697J/K flexible cable sets are designed for use with Keysight
network analyzers that have male Ruggedized-1.85 mm test ports.
The cable center conductor is fragile and will be seriously damaged if the cable is stretched, bent
too tightly, or bent too often. Cables break when the bend radius is too small—less than 2.5” (6
cm) for 1.85 mm cables, and less than 4” (10 cm) for 2.4 mm cables.
Use the following guidelines with cables:
— Never coil the cable too tightly.
— Never allow the cable to hang down from an instrument test port, or a
storage fixture, or while holding it.
—Never bend the cable an excessive number of times.

1-2 Keysight N4697J/K Operating and Service Manual
General Information
The Cable Sets
1-
N4697J
The N4697J set contains a single cable. Use it when a DUT is connected, with
the appropriate adapter, directly to the test set test port. See Figure 1-1 and
Figure 1-3.
Figure 1-1 N4697J Cable

Keysight N4697J/K Operating and Service Manual 1-3
General Information
The Cable Sets
N4697K
The N4697K set contains two cables. Each is shorter than the N4697J cable.
Use the N4697K cables when a DUT is connected between cable ends. See
Figure 1-2 and Figure 1-3.
Figure 1-2 N4697K Cables
Figure 1-3 Cable Configurations
Connectors Designators
Ruggedized Connectors
Ruggedized denotes a connector that has larger than standard coupling
threads for greater stability. Ruggedized connectors are used on test cables,
test ports, test port adapters, and test port cables.

1-4 Keysight N4697J/K Operating and Service Manual
General Information
The Cable Sets
1-
Female Ruggedized test port connectors are used on the test set end of
adapters and cables, and cannot be connected to standard male connectors.
Male Ruggedized connectors are used on test sets (as test ports), and on the
DUT end of adapters and cables. Male connectors have both the larger threads
(for use with test port adapters) and standard threads (for direct coupling to a
DUT).
PSC Connectors
PSC denotes a precision slotless connector. Precision slotless connectors are
metrology grade connectors that have better electrical performance, better
repeatability, and are more durable than slotted connectors.

Keysight N4697J/K Operating and Service Manual 1-5
General Information
Incoming Inspection
Clarifying the Terminology of a Connector Interface
In this document and in the prompts of the PNA calibration wizard, the gender
of cable connectors and adapters is referred to in terms of the center
conductor. For example, a connector or device designated as 1.85 mm –f– has
a 1.85 mm female center conductor.
8510-series, 872x, and 875x ONLY: In contrast, during a measurement
calibration, the network analyzer softkey menus label a 1.85 mm calibration
device with reference to the sex of the analyzer’s test port connector—not the
calibration device connector. For example, the label SHORT(F) refers to the
short that is to be connected to the female test port. This will be a male short
from the calibration kit.
A connector gage is referred to in terms of the connector that it measures. For
instance, a male connector gage has a female connector on the gage so that it
can measure male devices.
Incoming Inspection
Verify that the shipment is complete by referring to Table 4-1 on page 4-3.
If the case or any device appears damaged, or if the shipment is incomplete,
notify Keysight. See “Contacting Keysight” on page 1. Keysight will arrange for
repair or replacement of incomplete or damaged shipments without waiting for
a settlement from the transportation company.
When you send the cable set to Keysight, include the following information:
—yourcompanynameandaddress
— the name of a technical contact person within your company, and the
person’s complete phone number
— the model number and serial number of the cable set
— the part number and serial number of the device
— the type of service required
—adetailed description of the problem
Table 1-1 Clarifying the Sex of Connectors: Examples
Terminology Meaning
Short –f– Female short (female center conductor)
Short (f) Male short (male center conductor) to be connected to female port

1-6 Keysight N4697J/K Operating and Service Manual
General Information
Preventive Maintenance
1-
Preventive Maintenance
The best techniques for maintaining the integrity of the cables include:
— routine visual inspection
—cleaning
—propergaging
— proper connection techniques
—properstorage
All of the above are described in Chapter 3. Failure to detect and remove dirt or
metallic particles on a mating plane surface can degrade repeatability and
accuracy and can damage any connector mated to it. Improper connections,
resulting from center conductor values being out of limits (see Table 2-5 on
page 2-3), or from bad connections, can also damage cable connectors.
Replaceable Parts
See Table 4-1 on page 4-3 for a complete list of cable set contents and their
associated part numbers (you can order a single cable rather than the entire
cable set), and for recommended items not included with the cable set. Refer
to “Contacting Keysight” on page 1 for information about communicating with
Keysight.
Printing Copies of Documentation from the Web
To print copies of documentation from the Web, download the PDF file from
the Keysight web site:
— Go to http://www.keysight.com.
— Enter the document’s part number (located on the title page) in the Search
box.
— Click Search.
— Click on the hyperlink for the document.
— Click the printer icon located in the tool bar.

2-1
Keysight N4697J/K
Ruggedized-1.85 mm -f- to 1.85 mm Flexible Test Port Return Cables
Operating and Service Manual
2 Specifications
Environmental Requirements
Electrical Specifications
Table 2-1 Environmental Requirements
Parameter Limits
Operating temperature +20 °C to +26 °C (+68 °F to +79 °F)
Storage temperature −40 °C to +75 °C (−40 °F to +167 °F)
Altitude
Operation < 4,500 meters (≈15,000 feet)
Storage < 4,500 meters (≈15,000 feet)
Relative humidity Always non-condensing
Operation Up to 80% at 30°C
Storage Up to 95% at 40°C
Table 2-2 Electrical Specifications
Cable Return Loss
(dB)
Insertion
Loss (dB)
Frequency
Range (GHz)
N4697J ≥14 3.62 dB/ft at
65 GHz
DC to 70 GHz
N4697K

2-2 Keysight N4697J/K Operating and Service Manual
Specifications
Supplemental Characteristics
2-
Supplemental Characteristics
Table 2-3 lists supplemental performance characteristics. These are not
specifications, but are intended to provide additional information useful to your
application. Supplemental characteristics are typical (but not warranted)
performance parameters.
Center Conductor Pin Depth
Center conductor pin depth is the distance the center conductor mating plane
differs from being flush with the outer conductor mating plane. See Figure 2-1
The pin depth of a center conductor can be in one of two states: either
protruding or recessed.
Protrusion is the condition in which the center conductor extends beyond the
outer conductor mating plane. This condition will indicate a positive value on
the connector gage.
Table 2-3 Supplemental Characteristics (1 of 3)
Cable Cable LengthaApproximate
Electrical Delay
Magnitude and
Phase Stabilityb,c
Magnitude and
Phase Stabilityb,d
Minimum
Recommended
Bend Radius
cm in cm in
N4697J 97.2 38.25 3.84 ± 0.08 ns <0.1 dB Change
<0.5°(f)+0.09°
<0.2 dB Change
<0.5°(f)+0.17°
6.35 2.5
N4697K 62.9 24.75 2.48 ± 0.06 ns <0.06 dB Change
<0.5°(f)+0.04°
<0.12 dB Change
<0.5°(f)+0.1°
a. Cable length is a supplemental characteristic.
b. (f) = frequency in GHz.
c. With a 90°, 2.5 inch bend radius.
d. After three 90°, 2.5 inch bend radius/straighten cycles.
Table 2-4 Supplemental Characteristics (2 of 3)
Cable Number of
Cables
Test Set End Connector
Typea
DUT End Connector Type
N4697J 1 Ruggedized-1.85 mm -f- 1.85 mm -f-
N4697K 2 Ruggedized-1.85 mm -f- 1.85 mm -f- and Ruggedized
-1.85 mm -m- b
a. Special rugged female connector is designed specifically for connecting to the network
analyzer test port, but does not mate with a standard male connector.
b. Rugged male connector is used and mates with both rugged and standard female connectors.

Keysight N4697J/K Operating and Service Manual 2-3
Specifications
Supplemental Characteristics
Recession is the condition in which the center conductor is set back from the
outer conductor mating plane. This condition will indicate a negative value on
the connector gage.
Figure 2-1 Connector Center-Conductor Pin Depth
Table 2-5 Supplemental Characteristics (3 of 3)
Center-Conductor Pin Depth
Precision Connector Allowable Recession Allowable Protrusion
mm in mm in
Ruggedized-1.85 mm
-f-
-0.0051 to -0.0508 -0.0002 to -0.002 0.0000 0.0000
1.85 mm -f- -0.0051 to -0.0254 -0.0002 to -0.001
Ruggedized-1.85 mm
-m-
-0.0051 to -0.0254 -0.0002 to -0.001

2-4 Keysight N4697J/K Operating and Service Manual
Specifications
Supplemental Characteristics
2-

3-1
Keysight N4697J/K
Ruggedized-1.85 mm -f- to 1.85 mm Flexible Test Port Return Cables
Operating and Service Manual
3 Use, Maintenance, and Care of the Cables
Electrostatic Discharge
Protection against ESD (electrostatic discharge) is essential while connecting,
inspecting, or cleaning connectors attached to a static-sensitive circuit (such
as those found in test sets).
Static electricity can build up on your body and can easily damage sensitive
internal circuit elements when discharged. Static discharges too small to be
felt can cause permanent damage. Devices such as calibration components
and devices under test (DUTs), can also carry an electrostatic charge. To
prevent damage to the test set, components, and devices:
—always wear a grounded wrist strap having a 1 MΩresistor in series with it
when handling components and devices or when making connections to
the test set.
—always use a grounded, conductive table mat while making connections.
—always wear a heel strap when working in an area with a conductive floor. If
you are uncertain about the conductivity of your floor, wear a heel strap.
—always ground yourself before you clean, inspect, or make a connection to
a static-sensitive device or test port. You can, for example, grasp the
grounded outer shell of the test port or cable connector briefly.
—always ground the center conductor of a test cable before making a
connection to the analyzer test port or other static-sensitive device. This
can be done as follows:
1. Connect a short (from your calibration kit) to one end of the cable to
short the center conductor to the outer conductor.
2. While wearing a grounded wrist strap, grasp the outer shell of the
cable connector.
3. Connect the other end of the cable to the test port.
4. Remove the short from the cable.
Refer to Chapter 4 for part numbers and instructions for ordering ESD
protection devices.

3-2 Keysight N4697J/K Operating and Service Manual
Use, Maintenance, and Care of the Cables
Visual Inspection
3-
Figure 3-1 ESD Protection Setup
Visual Inspection
Visual inspection and, if necessary, cleaning should be done every time a
connection is made. Metal particles from the connector threads may fall onto
the mating plane surface of the connector when it is disconnected. One
connection made with a dirty or damaged connector can damage both
connectors beyond repair.
Magnification is helpful when inspecting connectors, but it is not required and
may actually be misleading. Defects and damage that cannot be seen without
magnification generally have no effect on electrical or mechanical
performance. Magnification is of great use in analyzing the nature and cause of
the damage and in cleaning connectors, but it is not required for inspection.
Use the following guidelines when evaluating the integrity of a connector.
Look for Obvious Defects and Damage First
Examine the connector first for obvious defects and damage: badly worn
plating on the connector interface, deformed threads, or bent, broken, or
misaligned center conductors. Connector nuts should move smoothly and be
free of burrs, loose metal particles, and rough spots.
What Causes Connector Wear?
Connector wear is caused by connecting and disconnecting the cable. The
more use a connector gets, the faster it wears and degrades. The wear is
greatly accelerated when connectors are not kept clean, or are connected
incorrectly.

Keysight N4697J/K Operating and Service Manual 3-3
Use, Maintenance, and Care of the Cables
Visual Inspection
Connector wear eventually degrades performance of the cable. Replace cables
with worn connectors.
The test port connectors on the network analyzer test set may have many
connections each day, and are therefore also subject to wear. It is
recommended that an adapter be used as a test port saver to minimize the
wear on the test set’s test port connectors.
Inspect the Mating Plane Surfaces
Flat contact between the connectors at all points on their mating plane
surfaces is required for a good connection. Look especially for deep scratches
or dents, and for dirt and metal particles on the connector mating plane
surfaces. Also look for signs of damage due to excessive or uneven wear or
misalignment.
Light burnishing of the mating plane surfaces is normal, and is evident as light
scratches or shallow circular marks distributed more or less uniformly over the
mating plane surface. Other small defects and cosmetic imperfections are also
normal. None of these affect electrical or mechanical performance.
If a connector shows deep scratches or dents, particles clinging to the mating
plane surfaces, or uneven wear, clean and inspect it again. Cables with
damaged connectors should be repaired or discarded. Determine the cause of
damage before connecting a new, undamaged connector in the same
configuration.
Connector Contacts
See Figure 3-2 on page 3 for visual guidelines when evaluating the contact
integrity of a connector.
Figure 3-2 Contact Integrity
Notice the location of the cross hairs in relationship to the center of the
figures.

3-4 Keysight N4697J/K Operating and Service Manual
Use, Maintenance, and Care of the Cables
Visual Inspection
3-
Concentricity
Figure 3-3 and Figure 3-4 show the concentricity of both the male and female
1.85 mm connectors. Inspect the connectors with a minimum magnification of
10X.
Figure 3-3 Concentricity of a Female Connector
Figure 3-4 Concentricity of a Male Connector
Inspect Female Connectors
Pay special attention to the contact fingers in the female center conductor.
These can be bent or broken, and damage to them is not always easy to see. A
connector with damaged contact fingers will negatively affect electrical
performance and must be replaced.
Inspection is particularly important when mating nonprecision to precision
devices.

Keysight N4697J/K Operating and Service Manual 3-5
Use, Maintenance, and Care of the Cables
Cleaning Connectors
Cleaning Connectors
Clean connectors are essential for ensuring the integrity of RF and microwave
coaxial connections.
1. Use Compressed Air or Nitrogen
Use compressed air (or nitrogen) to loosen particles on the connector
mating plane surfaces.
You can use any source of clean, dry, low-pressure compressed air or
nitrogen that has an effective oil-vapor filter and liquid condensation trap
placed just before the outlet hose.
Ground the hose nozzle to prevent electrostatic discharge, and set the air
pressure to less than 414 kPa (60 psi) to control the velocity of the air
stream. High-velocity streams of compressed air can cause electrostatic
effects when directed into a connector. These electrostatic effects can
damage the device. Refer to “Electrostatic Discharge” earlier in this
chapter for additional information.
2. Clean the Connector Threads
Use a lint-free swab or cleaning cloth moistened with isopropyl alcohol to
remove any dirt or stubborn contaminants on a connector that cannot be
removed with compressed air or nitrogen. Refer to Table 4-1 on page 3 for
part numbers for isopropyl alcohol and cleaning swabs.
a. Apply a small amount of isopropyl alcohol to a lint-free cleaning
swab.
b. Clean the connector threads.
Always use protective eyewear when using compressed air or
nitrogen.
Keep isopropyl alcohol away from heat, sparks, and flame. Store in a
tightly closed container. It is extremely flammable. In case of fire,
use alcohol foam, dry chemical, or carbon dioxide; water may be
ineffective.
Use isopropyl alcohol with adequate ventilation and avoid contact
with eyes, skin, and clothing. It causes skin irritation, may cause eye
damage, and is harmful if swallowed or inhaled. It may be harmful if
absorbed through the skin. Wash thoroughly after handling.
In case of spill, soak up with sand or earth. Flush spill area with
water.
Dispose of isopropyl alcohol in accordance with all applicable
federal, state, and local environmental regulations.

3-6 Keysight N4697J/K Operating and Service Manual
Use, Maintenance, and Care of the Cables
Gaging Connectors
3-
c. Let the alcohol evaporate, then blow the threads dry with a gentle
stream of clean, low-pressure compressed air or nitrogen. Always
completely dry a connector before you reassemble or use it.
3. Clean the Mating Plane Surfaces
a. Apply a small amount of isopropyl alcohol to a lint-free cleaning
swab.
b. Clean the center and outer conductor mating plane surfaces. Refer
to Figure 2-1 on page 3. When cleaning a female connector, avoid
snagging the swab on the center conductor contact fingers by using
short strokes.
c. Let the alcohol evaporate, then blow the connector dry with a gentle
stream of clean, low-pressure compressed air or nitrogen. Always
completely dry a connector before you reassemble or use it.
4. Reinspect
Inspect the connector again to make sure that no particles or residue are
present.
Gaging Connectors
The gages available from Keysight Technologies are intended for preventive
maintenance and troubleshooting purposes only. (See Table 4-1 on page 3 for
part number information.) They are effective in detecting excessive center
conductor protrusion or recession, and conductor damage on test cables and
other accessories, DUTs, and calibration kit devices. Do not use the gages for
precise pin depth measurements.
Connector Gage Accuracy
The connector gages are only capable of performing coarse measurements.
They do not provide the degree of accuracy necessary to precisely measure the
pin depth of the cable connectors. This is partially due to the repeatability
uncertainties that are associated with the measurement. Only the factory—
through special gaging processes and electrical testing— can accurately verify
the mechanical characteristics of the cable connectors.
With proper technique, however, the gages are useful in detecting gross pin
depth errors on cable connectors. To achieve maximum accuracy, random
errors must be reduced by taking the average of at least three measurements
having different gage orientations on the connector. Even the resultant
average can be in error by as much as ±0.0001 inch due to systematic
(biasing) errors usually resulting from worn gages and gage masters. The