Keysight V8486A User manual

Keysight V8486A
Power Sensor
User’s Guide

2Keysight V8486A User’s Guide
Notices
Copyright Notice
© Keysight Technologies 1999-2018
No part of this manual may be reproduced in
any form or by any means (including electronic
storage and retrieval or translation into a for-
eign language) without prior agreement and
written consent from Keysight Technologies as
governed by United States and international
copyright laws.
Manual Part Number
08486-90131
Edition
Edition 6, March 1, 2018
Printed in:
Printed in Malaysia
Published by:
Keysight Technologies
Bayan Lepas Free Industrial Zone,
11900 Penang, Malaysia
Technology Licenses
The hardware and/or software described in
this document are furnished under a license
and may be used or copied only in accordance
with the terms of such license.
Declaration of Conformity
Declarations of Conformity for this product
and for other Keysight products may be down-
loaded from the Web. Go to http://www.key-
sight.com/go/conformity. You can then search
by product number to find the latest Declara-
tion of Conformity.
U.S. Government Rights
The Software is “commercial computer soft-
ware,” as defined by Federal Acquisition Regu-
lation (“FAR”) 2.101. Pursuant to FAR 12.212
and 27.405-3 and Department of Defense FAR
Supplement (“DFARS”) 227.7202, the U.S.
government acquires commercial computer
software under the same terms by which the
software is customarily provided to the public.
Accordingly, Keysight provides the Software to
U.S. government customers under its standard
commercial license, which is embodied in its
End User License Agreement (EULA), a copy of
which can be found at http://www.key-
sight.com/find/sweula. The license set forth in
the EULA represents the exclusive authority by
which the U.S. government may use, modify,
distribute, or disclose the Software. The EULA
and the license set forth therein, does not
require or permit, among other things, that
Keysight: (1) Furnish technical information
related to commercial computer software or
commercial computer software documenta-
tion that is not customarily provided to the
public; or (2) Relinquish to, or otherwise pro-
vide, the government rights in excess of these
rights customarily provided to the public to
use, modify, reproduce, release, perform, dis-
play, or disclose commercial computer soft-
ware or commercial computer software
documentation. No additional government
requirements beyond those set forth in the
EULA shall apply, except to the extent that
those terms, rights, or licenses are explicitly
required from all providers of commercial
computer software pursuant to the FAR and
the DFARS and are set forth specifically in
writing elsewhere in the EULA. Keysight shall
be under no obligation to update, revise or
otherwise modify the Software. With respect
to any technical data as defined by FAR 2.101,
pursuant to FAR 12.211 and 27.404.2 and
DFARS 227.7102, the U.S. government
acquires no greater than Limited Rights as
defined in FAR 27.401 or DFAR 227.7103-5 (c),
as applicable in any technical data.
Warranty
THE MATERIAL CONTAINED IN THIS DOCU-
MENT IS PROVIDED “AS IS,” AND IS SUBJECT
TO BEING CHANGED, WITHOUT NOTICE, IN
FUTURE EDITIONS. FURTHER, TO THE MAXI-
MUM EXTENT PERMITTED BY APPLICABLE
LAW, KEYSIGHT DISCLAIMS ALL WARRAN-
TIES, EITHER EXPRESS OR IMPLIED, WITH
REGARD TO THIS MANUAL AND ANY INFOR-
MATION CONTAINED HEREIN, INCLUDING
BUT NOT LIMITED TO THE IMPLIED WARRAN-
TIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE. KEYSIGHT
SHALL NOT BE LIABLE FOR ERRORS OR FOR
INCIDENTAL OR CONSEQUENTIAL DAMAGES
IN CONNECTION WITH THE FURNISHING,
USE, OR PERFORMANCE OF THIS DOCU-
MENT OR OF ANY INFORMATION CONTAINED
HEREIN. SHOULD KEYSIGHT AND THE USER
HAVE A SEPARATE WRITTEN AGREEMENT
WITH WARRANTY TERMS COVERING THE
MATERIAL IN THIS DOCUMENT THAT CON-
FLICT WITH THESE TERMS, THE WARRANTY
TERMS IN THE SEPARATE AGREEMENT
SHALL CONTROL.
Safety Information
CAUTION
A CAUTION notice denotes a hazard. It calls
attention to an operating procedure, practice,
or the like that, if not correctly performed or
adhered to, could result in damage to the
product or loss of important data. Do not pro-
ceed beyond a CAUTION notice until the indi-
cated conditions are fully understood and met.
WARNING
A WARNING notice denotes a hazard. It calls
attention to an operating procedure, practice,
or the like that, if not correctly performed or
adhered to, could result in personal injury or
death. Do not proceed beyond a WARNING
notice until the indicated conditions are fully
understood and met.

3
Keysight V8486A User’s Guide
Certification
Keysight Technologies certifies that this product met its published specifications at the time of
shipment. Keysight further certifies that its calibration measurements are traceable to the United
States National Institute of Standard and Technology (formerly National Bureau of Standards), to
the extent allowed by that organization’s calibration facility, and to the calibration facilities of other
International Standards Organization members.
Warranty
This Keysight Technologies instrument product is warranted against defects in material and
workmanship for a period of 3 years from date of shipment. During the warranty period, Keysight
Technologies will at its option, either repair or replace products which prove to be defective. For
warranty service or repair, this product must be returned to a service facility designated by
Keysight Technologies. Buyer shall prepay shipping charges to Keysight Technologies and Keysight
Technologies shall pay shipping charges, duties, and taxes for products returned to Keysight
Technologies from another country. Keysight Technologies warrants that its software and firmware
designated by Keysight Technologies for use with an instrument will execute its programming
instructions when properly installed on that instrument. Keysight Technologies does not warrant
that the operation of the instrument, 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. KEYSIGHT
TECHNOLOGIES SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE.

4Keysight V8486A User’s Guide
Exclusive Remedies
THE REMEDIES PROVIDED HEREIN ARE BUYER’S SOLE AND EXCLUSIVE REMEDIES. KEYSIGHT
TECHNOLOGIES SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES, WHETHER BASED ON CONTRACT, TORT, OR ANY OTHER LEGAL
THEORY.
Safety Considerations
Read the information below before using this instrument.
The following general safety precautions must be observed during all phases of operation, service,
and repair of this instrument. Failure to comply with these precautions or with specific warnings
elsewhere in this manual violates safety standards for design, manufacture, and intended use of
the instrument. Keysight Technologies assumes no liability for the customer’s failure to comply
with these requirements.

Keysight V8486A User’s Guide 5
Environmental Conditions
The V8486A is designed for indoor use and in an area with low condensation. The table below
shows the general environmental requirements for this instrument.
Environmental condition Requirement
Temperature
Operating condition
– 0 °C to 55 °C
Storage condition
– –40 °C to 70 °C
Humidity
Operating condition
– Up to 95%
Storage condition
– Up to 95% RH at 40°C (non-condensing)
Altitude
Operating condition
– Up to 4550 meters
Storage condition
– Up to 7,600 meters

6Keysight V8486A User’s Guide
Waste Electrical and Electronic Equipment (WEEE) Directive 2002/96/EC
This instrument complies with the WEEE Directive (2002/96/EC) marking requirement. This affixed
product label indicates that you must not discard this electrical or electronic product in domestic
household waste.
Product category:
With reference to the equipment types in the WEEE directive Annex 1, this instrument is classified
as a “Monitoring and Control Instrument” product.
The affixed product label is as shown below.
Do not dispose in domestic household waste.
To return this unwanted instrument, contact your nearest Keysight Service Center, or visit http://
about.keysight.com/en/companyinfo/environment/takeback.shtml for more information.
Sales and Technical Support
To contact Keysight for sales and technical support, refer to the support links on the following
Keysight websites:
–www.keysight.com/find/waveguidepowersensors
(product-specific information and support, software and
documentation updates)
–www.keysight.com/find/assist
(worldwide contact information for repair and service)

Keysight V8486A User’s Guide 7
Table of Contents
Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Limitation of Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Exclusive Remedies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Environmental Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Waste Electrical and Electronic Equipment (WEEE) Directive 2002/96/EC . . . . . . . . . . 6
Product category: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Sales and Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1Introduction
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Recommended calibration interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Initial inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Interconnections and calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Storage and Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Original packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2 General Operation
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Operating precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Power meter calibrations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Power measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Operating instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Modulation effects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Linearity correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3 Specifications and Characteristics
Specifications and Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Calibration Factor (CF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4Service
Performance Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Zero set performance verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Power linearity performance verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Replaceable Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Repair and adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

8Keysight V8486A User’s Guide
List of Figures
Figure 1-1 Keysight V8486A power sensor with accessories and hardware . . . . 10
Figure 2-1 Precision V-band interface on the front of the power sensor . . . . . . . 17
Figure 2-2 Typical influence of temperature on sensitivity . . . . . . . . . . . . . . . . .19
Figure 4-1 Zero set performance verification equipment setup . . . . . . . . . . . . . . 26
Figure 4-2 Power linearity performance verification equipment setup . . . . . . . . 28
List of Tables
Table 2-1 Cal factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Table 3-1 Calibration factor uncertainty at1 mW (0 dBm) . . . . . . . . . . . . . . . . . 23
Table 4-1 Replaceable parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Keysight V8486A Power Sensor
User’s Guide
9
1 Introduction
General Information 10
Installation 12
Storage and Shipment 13
This chapter provides an overview of the V8486A power sensor and its general information.

1Introduction
10Keysight V8486A User’s Guide
General Information
This User’s guide contains information about initial inspection and operation of the Keysight
V8486A power sensor.
Figure 1-1 Keysight V8486A power sensor with accessories and hardware
Warranty
The power sensor is warranted and certified as indicated on page 3 of this manual. Do not open
the power sensor. Any attempt to disassemble the power sensor will void warranty.
Description
The Keysight V8486A is a diode-based power sensor. It measures power levels in a range from –30
dBm to +20 dBm. (Specifications for the power sensor are in Table 3-1.) The Keysight V8486A
measures at frequencies from 50 GHz to 75 GHz.
The power is determined from the ac voltage developed across the waveguide termination from the
microwave source. The diodes convert this ac voltage to dc. The dc voltage produced is
proportional to the square of the ac voltage. The dc voltage thus generated is a very low-level
voltage and requires amplification before it can be transferred via the sensor cable to the power
meter.
The amplification is provided by an input amplifier assembly which consists of a chopper (sampling
gate) and an input amplifier. The dc voltage is routed to the chopper circuit which converts the
Keysight V8486A
power sensor
Flange screws
(1390-0671)
Hex ball driver
(8710-1539)

Introduction 1
Keysight V8486A User’s Guide 11
low-level dc voltage to an ac voltage. The chopper is driven by a square wave generated by the
power meter. The result is an ac output signal proportional to the dc input. The ac signal is then
amplified by the input amplifier. The relatively high-level ac signal output can now be routed by
standard cables.
In application, the power sensor is connected between a microwave source and a compatible
power meter. The power sensor provides a matched load for the microwave source for very low
SWR. The power meter indicates the power dissipated in the load in μW, mW or in dBm.
Accessories
Included is a hex ball driver plus the waveguide mounting screws. Refer to Figure 1-1 for a visual
check of what should be included with your power sensor.
Recommended calibration interval
Keysight Technologies recommends a one-year calibration cycle for the V8486A power sensor.
NOTE
The Keysight V8486A power sensor is compatible with the following power meters:
Keysight 435B Keysight E1416A
Keysight 436A Keysight E4418A/B
Keysight 437B Keysight E4419A/B
Keysight 438A Keysight 70100A
To obtain optimum accuracy for power measurements above +10 dBm, when used with the
Keysight E4418A and Keysight E4419A power meters, a firmware upgrade will be required. Refer
to your Keysight E4418A and Keysight E4419A power meter’s user’s guide for instructions on
how to obtain the revision of the firmware currently installed in the unit. The firmware revision
required is A1.03.00 (or above) for the Keysight E4418A and A2.03.00 (or above) for the Keysight
E4419A. Contact your local Keysight Technologies Sales and Service Office for more information.
CAUTION
Do not disassemble the power sensor. The power sensor is extremely static-sensitive and can be
easily damaged.

1Introduction
12Keysight V8486A User’s Guide
Installation
Initial inspection
Inspect the shipping container for damage. If the shipping container or packaging material is
damaged, it should be kept until the contents of the shipment have been checked mechanically
and electrically. If there is mechanical damage or if the instrument does not pass the performance
tests, notify the nearest Keysight Technologies office. Keep the damaged shipping materials (if any)
for inspection by the carrier and a Keysight Technologies representative.
Interconnections and calibration
The Keysight V8486A power sensor has two inputs: a Type-N connector and a waveguide flange.
During calibration, the Type-N connector is connected to the calibration port of the power meter.
During measurement, the waveguide flange is connected to the device under test.
Use the protective packaging provided with the power sensor to protect it from dirt and
mechanical damage whenever it is not in use. Any burrs, dents or dirt on the flange or waveguide
surface will increase the SWR and change the Cal Factor.
Refer to the power meter operating and service manual for interconnecting instructions.
CAUTION Connect the power sensor by turning only the nut on the Type-N connector. Damage can occur if
torque is applied to the power sensor body.
The waveguide flanges can be damaged if the flange screws are over-tightened. Do not fully
tighten one flange screw without tightening the one opposite. First insert screws and tighten
until finger tight. If you are using the hex ball driver, hold the driver between thumb and
forefinger while incrementally tightening screws opposite each other until reaching a maximum
torque of 0.42 N x m.

Introduction 1
Keysight V8486A User’s Guide 13
Storage and Shipment
Original packaging
Containers and materials identical to those used in factory packaging are available through
Keysight Technologies offices. If the instrument is being returned to Keysight Technologies for
servicing, 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 serial number.

1Introduction
14 Keysight V8486A User’s Guide
THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.

Keysight V8486A Power Sensor
User’s Guide
15
2 General Operation
Operation 16
This chapter provides the V8486A general operation information on how to check and prepare your
instrument for operation.

2 General Operation
16 Keysight V8486A User’s Guide
Operation
Operating precautions
The power sensor has a precision machined V-band waveguide interface. The size and position of
the aperture, the alignment holes and pins, and the flatness of the mating faces are all very tightly
controlled. Refer to Figure 2-1.
In order to get the best possible measurement results the mating part must be of similar quality.
Connection to a V-band waveguide component in which the interface dimensions are not
accurately controlled can lead to increased SWR, inaccurate Cal Factor correction, and/or
repeatability problems. In addition, connections to a well-manufactured but dirty part can lead to
any of the above measurement problems. Conversely, always insuring connections to parts with
clean, high-quality waveguide interfaces will lead to accurate power measurements over the life of
the product.
Use the protective packaging provided with the sensor to protect the waveguide connector from
dirt and mechanical damage whenever it is not in use. Any burn, dents or dirt on the flange or
waveguide surface will increase the SWR and change the Cal Factor.
The Type-N connector plastic bead deteriorates when contacted by any chlorinated or aromatic
hydrocarbons such as acetone, trichlorethylene, carbon tetrachloride, benzene, etc. Clean the
connector face with a cotton swab saturated in isopropyl alcohol.
WARNING BEFORE CONNECTING THE POWER SENSOR TO OTHER INSTRUMENTS, ensure that all
instruments are connected to the protective (earth) ground. Any interruption of the
protective earth grounding will cause a potential shock hazard that could result in personal
injury and cause damage to the power sensor.
CAUTION If the following energy and power levels are exceeded, the power meter system may be
damaged.
– Maximum Average Power: 200 mW
– Maximum Peak Power: 40W[a]
[a] 10 micro-second pulse, 0.5% duty cycle or equivalent such that 200 mW maximum average power and 40W peak power are not exceeded.
CAUTION Connection to a V-band waveguide component with a dirty, or damaged flange (for example
loose particulates, raised metal burrs or bent alignment pins) can damage the precision
interface of the power sensor. Always inspect and clean the mating part prior to connection.

General Operation 2
Keysight V8486A User’s Guide 17
Figure 2-1 Precision V-band interface on the front of the power sensor
Power meter calibrations
The procedure for calibration may be different for each compatible power meter. Follow the
calibration directions given in your power meter manual.
Power measurements
To correct for varying responses at different frequencies a cal factor chart is included on the power
sensors. To use the cal factor at the frequency of interest, adjust the power meter's CAL FACTOR
control according to the instructions in the power meter's operating and service manual. This will
automatically correct the power readings.
If you are using a Keysight 435B or Keysight 436A, the minimum cal factor setting is 85% and the
maximum is 100%. If the cal factor setting for your frequency of interest is below the meter's
minimum or above the meter's maximum, set the cal factor control to 100%, and divide the reading
in watts units by the decimal equivalent of the cal factor. For example, if the cal factor is 75%,
divide the reading by 0.75. (This will result in a larger value of power than that displayed by the
meter.)
If the cal factor is 104%, divide the reading by 1.04. (This will result in a smaller value of power
than that displayed by the meter.)
If reading in dBm, use the chart in Table 2-1 to convert the cal factor to dB and add this value to
the reading. Interpolate for values between those shown. As above, the cal factor control should be
set to 100%. If the cal factor is 75%, add 1.25 dB to the displayed value. On the other hand, if the
cal factor is 104% subtract 0.17 dB from the displayed reading.
1.905
3.810
2× ø 1.588
ø 14.288
Bolt circle 2× ø 1.660
Units in mm
4× 4-40 UNC-2B
NOTE
The above procedure has eliminated some mathematical steps; the following formula may be of
some use:
Correct dBm = Reading dBm – 10 × Log10 {Cal Factor (decimal)}.

2 General Operation
18 Keysight V8486A User’s Guide
Table 2-1 Cal factor
Cal factor dB Cal factor dB Cal factor dB
70% 1.549 85% 0.706 115% –0.607
71% 1.487 101% −0.043 116% −0.645
72% 1.427 102% −0.086 117% −0.682
73% 1.367 103% −0.128 118% −0.719
74% 1.308 104% −0.170 119% −0.755
75% 1.249 105% −0.212 120% –0.792
76% 1.192 106% −0.253 121% −0.828
77% 1.134 107% −0.294 122% −0.864
78% 1.079 108% −0.334 123% −0.899
79% 1.024 109% −0.374 124% −0.934
80% 0.969 110% −0.414 125% −0.969
81% 0.915 111% −0.453 126% −1.004
82% 0.862 112% −0.492 127% –1.038
83% 0.809 113% −0.531 128% –1.072
84% 0.757 114% −0.569 129% –1.106
130% –1.139

General Operation 2
Keysight V8486A User’s Guide 19
Figure 2-2 Typical influence of temperature on sensitivity
The sensitivity of the power sensor is influenced by ambient temperature. The sensor should be
calibrated at the temperature of operation to obtain the most accurate results. Typical temperature
sensitivity variations are shown in Figure 2-2.
Operating instructions
To operate the power sensor, refer to the operating instructions in of the power meter operating
and service manual.
Modulation effects
When measuring microwave sources that are modulated at the chopper frequency (nominally 220
Hz for the Keysight 43X family and 217 Hz for the Keysight E4418A/B and Keysight E4419A/B), or
at the first or second harmonic or submultiples of the chopper frequency, beat notes will occur.
Unless the modulation rate is exactly the chopper frequency, they can usually be eliminated by
averaging since the amplitudes are centered on the actual power. These frequencies may also be
avoided by changing the modulation frequency slightly, if possible.
If you are using a Keysight 437B, Keysight E4418A/B or Keysight E4419A/B Power Meter, a filter
setting of 128 will minimize most beat note interference. To minimize beat note interference using
a Keysight 438A Power Meter select a filter number of at least 7.
Linearity correction
For most Keysight 8480 series power sensors the correct (A type or D type) linearity correction
table is automatically selected. However, when you use the Keysight V8486A power sensor with
Keysight EPM power meters, you must override the automatic selection and select the D-type
correction. This procedure provides optimum accuracy when making power measurements
>+10dBm. Subsequent connection of another
A-type sensor will result in a warning message stating the “Linearity Override May be Required”.
To select the linearity type to be applied:
Sensitivity change, dB
Temperature, °C
NOTE
If having an open RF connection on your system is a concern, terminate the sensor Type-N
calibration port with a 50 Ωload.

2 General Operation
20 Keysight V8486A User’s Guide
Keysight E4418B
Press [System Inputs], Tables, Linearity ATyp DTyp.
Keysight E4419B
Press [System Inputs], Tables, A Linearity ATyp DTyp or B Linearity ATyp DTyp.
NOTE For use with the Keysight E4418A and Keysight E4419A power meters, a firmware upgrade will
be required. Refer to your Keysight E4418A and Keysight E4419A power meter’s user’s guide for
instructions on how to obtain the revision of the firmware currently installed in the unit. The
firmware revision required is A1.03.00 (or above) for the Keysight E4418A and A2.03.00 (or
above) for the Keysight E4419A. Contact your local Keysight Technologies Sales and Service
Office for further information.