Keysight N1914A, N1913 Service Manual

Keysight N1913/1914A
EPM Series Power Meters

Service Guide

Notices

CAUTION

WARNING

Copyright Notice

© Keysight Technologies 2009 - 2016
No part of this manual may be repro-

duced in any form or by any means
(including electronic storage and
retrieval or translation into a foreign
language) without prior agreement and
written consent from Keysight Technol­ogies as governed by United States and
international copyright laws.

Manual Part Number

N1913-90009

Edition

Edition 14, November 18, 2016

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 downloaded from the
Web. Go to http://www.keysight.com/

go/conformity. You can then search by

product number to find the latest Dec­laration of Conformity.

U.S. Government Rights

The Software is “commercial computer
software,” as defined by Federal Acqui­sition Regulation (“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.keysight.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
documentation that is not customarily
provided to the public; or (2) Relinquish
to, or otherwise provide, the govern­ment rights in excess of these rights
customarily provided to the public to
use, modify, reproduce, release, per­form, display, or disclose commercial
computer software 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
DOCUMENT IS PROVIDED “AS IS,”
AND IS SUBJECT TO BEING
CHANGED, WITHOUT NOTICE, IN
FUTURE EDITIONS. FURTHER, TO THE
MAXIMUM EXTENT PERMITTED BY
APPLICABLE LAW, KEYSIGHT DIS­CLAIMS ALL WARRANTIES, EITHER
EXPRESS OR IMPLIED, WITH REGARD
TO THIS MANUAL AND ANY INFORMA­TION CONTAINED HEREIN, INCLUD­ING BUT NOT LIMITED TO THE
IMPLIED WARRANTIES 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 DOCUMENT
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
CONFLICT WITH THESE TERMS, THE
WARRANTY TERMS IN THE SEPARATE
AGREEMENT SHALL CONTROL.

Safety Information

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 pro­ceed beyond a CAUTION notice until
the indicated conditions are fully
understood and met.

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.

2 Keysight N1913/1914A Service Guide

Certification

Keysight Technologies certifies that this product met its published specifications
at the time of shipment from the factory. Keysight Technologies further certifies
that its calibration measurements are traceable to the United States National
Institute of Standard and Technology, to the extent allowed by the Institute’s
calibration facility, and to the calibration facilities of other International Standard
Organization members.

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.

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.

Keysight N1913/1914A Service Guide 3

Equipment Operation

WARNING

CAUTION

Warnings and Cautions

This guide uses warnings and cautions to denote hazards.

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 loss of life. Do not proceed beyond a
WARNING notice until the indicated conditions are fully understood and
met.

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
proceed beyond a CAUTION notice until the indicated conditions are fully
understood and met.

Personal Safety Considerations

This is a Safety Class I product (provided with a protective earthing ground
incorporated in the power cord). The mains plug shall only be inserted in a socket
outlet provided with a protective earth contact. Any interruption of the protective
conductor, inside or outside the instrument, is likely to make the instrument
dangerous. Intentional interruption is prohibited. If this instrument is not used as
specified, the protection provided by the equipment could be impaired. This
instrument must be used in a normal condition (in which all means of protection
are intact) only. No operator serviceable parts inside. Refer servicing to qualified
personnel. To prevent electrical shock, do not remove covers. For continued
protection against fire hazard, replace the line fuse(s) only with fuses of the same
type and rating (for example, normal blow, time delay, etc.). The use of other fuses
or material is prohibited.

4 Keysight N1913/1914A Service Guide

Safety Considerations

WARNING

CAUTION

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.

Before this instrument is switched on, make sure it has been properly
grounded through the protective conductor of the ac power cable to a
socket outlet provided with protective earth contact. Any interruption of the
protective (grounding) conductor, inside or outside the instrument, or
disconnection of the protective earth terminal can result in personal injury.

Any adjustments or service procedures that require operation of the
instrument with protective covers removed should be performed only by
trained service personnel.

Keysight N1913/1914A Service Guide 5

Safety Symbols

The following symbols on the instrument and in the documentation indicate
precautions which must be taken to maintain safe operation of the instrument.

Direct current (DC) Alternating current (AC)

Off (mains supply) On (mains supply)

Caution, risk of electric shock

Earth (ground) terminal Frame or chassis (ground) terminal

Protective earth (ground) terminal

Both direct and alternating current Out position of a bi-stable push control

Caution, risk of danger (refer to this
manual for specific Warning or Caution
information)

Equipment protected throughout by
double insulation or reinforced
insulation

Caution, hot surface In position of a bi-stable push control

Operating switch for ‘Stand-by’

[a]

mode

Equipotentiality

[a] Note: The instrument is NOT isolated from the mains when the switch is pressed. To isolate the instrument, the mains coupler

(mains input cord) should be removed from the power supply.

Three-phase alternating current

6 Keysight N1913/1914A Service Guide

Environmental Conditions

The N1913/1914A 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

Humidity

Altitude

Pollution degree 2

Operating condition
– 0 °C to 55 °C
Storage condition
– –40 °C to 70 °C

Operating condition
– Up to 80% RH at 40°C (non-condensing)
Storage condition
– Up to 95% RH at 65°C (non-condensing)

Operating condition
– Up to 4600 meters (15,000 feet)
Storage condition
– Up to 15,240 meters (50,000 feet)

Keysight N1913/1914A Service Guide 7

Regulatory Information

The N1913/1914A complies with the following safety and Electromagnetic
Compatibility (EMC) compliances:

General

This product complies with the essential requirements of the following applicable
European (EC) Directives, and carries the CE marking accordingly to Low Voltage
Directive (2006/95/EC) and EMC Directive (2004/108/EC and 89/336/EEC).

Safety compliance

– IEC 61010-1:2010/EN 61010-1:2010 (3rd Edition)

– Canada: CAN/CSA-C22.2 No. 61010-1-12

– USA: ANSI/UL 61010-1 (3rd Edition)

EMC compliance

The EMC test conforms to the IEC61326-1:2005/EN61326-1:2006 and
CISPR11:2003/EN55011:2007 (Group 1, Class A) standards. In order to preserve
the EMC performance of the product, any cable which becomes worn or damaged
must be replaced with the same type and specification.

– IEC 61326-1:2005/EN 61326-1:2006

– CISPR11:2003/EN 55011:2007, Group 1 Class A

– Canada: ICES/NMB-001:Issue 4, June 2006

– Australia/New Zealand: AS/NZS CISPR 11:2004

Low voltage directive

– This product conforms to the requirements of European Council Directive

“2006/95/EC”.

8 Keysight N1913/1914A Service Guide

Regulatory Markings

The CE mark is a registered trademark
of the European Community. This CE
mark shows that the product complies
with all the relevant European Legal
Directives.

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.

This symbol indicates the time period
during which no hazardous or toxic
substance elements are expected to
leak or deteriorate during normal use.
Forty years is the expected useful life
of the product.

The CSA mark is a registered
trademark of the Canadian
Standards Association.

ICES/NMB-001 indicates that this ISM
device complies with the
Canadian ICES-001.
Cet appareil ISM est conforme a la
norme NMB-001 du Canada.

The RCM mark is a registered
trademark of the Australian
Communications and Media Authority.

Keysight N1913/1914A Service Guide 9

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/epm

(product-specific information and support, software and
documentation updates)

– www.keysight.com/find/assist

(worldwide contact information for repair and service)

10 Keysight N1913/1914A Service Guide

Table of Contents

Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Limitation of Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Exclusive Remedies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Equipment Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Safety Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Environmental Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Regulatory Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Safety compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

EMC compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Low voltage directive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Regulatory Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Waste Electrical and Electronic Equipment (WEEE) Directive

2002/96/EC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Product category . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Sales and Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

1 Specifications and Characteristics

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Specification definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Recommended Calibration Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

Power Meter Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

Power Sensor Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

Power Meter Supplemental Characteristics . . . . . . . . . . . . . . . . . . . . .30

Settling Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

Measurement Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

Keysight N1913/1914A Service Guide 11

Measurement speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Rear Panel Inputs and Output Connections . . . . . . . . . . . . . . . . . . . . . 42

Line power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

1 mW Power Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Battery storage conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Physical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

2Performance Tests

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Complete Equipment List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

1 mW Power Reference Level Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Test method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Output Standing Wave Ratio (SWR) Test . . . . . . . . . . . . . . . . . . . . . . . 53

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Test method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Zero Set (Average Path) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Test method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Absolute Accuracy Test (Average Path) . . . . . . . . . . . . . . . . . . . . . . . . . 57

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Test Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Linearity (Average Path) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Test method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

12 Keysight N1913/1914A Service Guide

3Adjustments

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64

Power Reference Level Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . .65

Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Test method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

4 Theory of Operation

PPMC Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68

Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68

Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68

Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Main Board Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69

Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69

Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69

Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Calibrator Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70

Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70

Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70

Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Front Panel Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71

Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71

Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71

Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

PSU Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72

Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72

Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

5 Troubleshooting Guide

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74

Power-Up Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74

Basic external checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74

Basic internal checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74

Keysight N1913/1914A Service Guide 13

Possible faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Instrument Self-Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Extended Self-Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

Performance Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

Power Reference Level Adjustment Problems . . . . . . . . . . . . . . . . . . . 76

Possible faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

Communication Interface Failures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Additional Diagnostic Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

6Repair Guide

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Replaceable Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Front panel assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Rear panel assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

Additional spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

Calibrator assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

Improved calibrator assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

Outer housing components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

Sundries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

Required Torque Values for Fasteners . . . . . . . . . . . . . . . . . . . . . . . . 105

Disassembly Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

Reassembly Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

Disassembly vs Part Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Front Panel Disassembly Instructions . . . . . . . . . . . . . . . . . . . . . . . . . 119

Front Panel Reassembly Instructions . . . . . . . . . . . . . . . . . . . . . . . . . 124

Additional Repair Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

Replacing the sensor flex assembly . . . . . . . . . . . . . . . . . . . . . . . . 128

Main Board vs. Rear Panel Assembly . . . . . . . . . . . . . . . . . . . . . . . . . 129

Replacing the PPMC Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130

Replacing the Calibrator Semi-Rigid/Split Ferrite . . . . . . . . . . . . . . . 131

14 Keysight N1913/1914A Service Guide

7 Contacting Keysight Technologies

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .134

Contacting Keysight Technologies . . . . . . . . . . . . . . . . . . . . . . . . .134

Before Calling Keysight Technologies . . . . . . . . . . . . . . . . . . . . . . . . .135

Check the Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .136

Instrument Serial Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .137

Returning Your Power Meter for Service . . . . . . . . . . . . . . . . . . . . . . .138

Useful Web Pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .139

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16 Keysight N1913/1914A Service Guide

List of Figures

Figure 1-1 8480 Series settling time with auto-filter . . . . . . . . . .35

Figure 1-2 E441x Series settling time with auto-filter . . . . . . . . .36

Figure 1-3 E9300 Series settling time with auto-filter . . . . . . . . .37

Figure 1-4 N8480 Series settling time with auto-filter . . . . . . . . .38

Figure 1-5 U2000 Series settling time with auto-filter . . . . . . . . . 40

Figure 2-1 1 mW power reference level test setup connection

Figure 2-2 System calibration connection diagram . . . . . . . . . . .54

Figure 2-3 Output SWR test setup-open connection diagram . . . 54
Figure 2-4 Output SWR test setup-load connection diagram . . .54

Figure 2-5 Absolute accuracy test setup . . . . . . . . . . . . . . . . . . . .58

Figure 6-1 Calibrator assembly and improved calibrator assembly .

Figure 6-2 Separate the clamshells . . . . . . . . . . . . . . . . . . . . . . .106

Figure 6-3 Remove the top clamshell . . . . . . . . . . . . . . . . . . . . .107

Figure 6-4 Remove the PSU safety cover and cable guide . . . . .107

Figure 6-5 Remove the PSU . . . . . . . . . . . . . . . . . . . . . . . . . . . .108

Figure 6-6 Top view with top clamshell removed . . . . . . . . . . . .109

Figure 6-7 Remove the EMI earth wires . . . . . . . . . . . . . . . . . . .110

Figure 6-8 Disconnect the front panel cable . . . . . . . . . . . . . . . .110

Figure 6-9 Disconnect the semi-rigid cable . . . . . . . . . . . . . . . .110

Figure 6-10 Remove the front panel . . . . . . . . . . . . . . . . . . . . . . .111

Figure 6-11 Remove PPMC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .111

Figure 6-12 Remove the main board . . . . . . . . . . . . . . . . . . . . . . .112

Figure 6-13 Remove the rear panel . . . . . . . . . . . . . . . . . . . . . . . .112

Figure 6-14 Analog recorder output connections . . . . . . . . . . . . .113

Figure 6-15 Sensor flex connections . . . . . . . . . . . . . . . . . . . . . . .114

Figure 6-16 PSU screw locations . . . . . . . . . . . . . . . . . . . . . . . . . .115

Figure 6-17 PSU cable routing . . . . . . . . . . . . . . . . . . . . . . . . . . .116

Figure 6-18 Main board revision markings . . . . . . . . . . . . . . . . . .129

Figure 6-19 Separate the two halves of the ferrite . . . . . . . . . . . .131

diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51

100

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18 Keysight N1913/1914A Service Guide

List of Tables

Table 1-1 Zero set specifications . . . . . . . . . . . . . . . . . . . . . . . . .26

Table 1-2 Zero set (internal and external) for U2000 Series . . . .28

Table 1-3 Noise multiplier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

Table 1-4 Power sensor specifications . . . . . . . . . . . . . . . . . . . . .30

Table 1-5 U2000 Series power sensors specification . . . . . . . . .33

Table 1-6 8480 Series settling time . . . . . . . . . . . . . . . . . . . . . . .35

Table 1-7 E441x and E9300 Series settling time . . . . . . . . . . . . .36

Table 1-8 N8480 Series settling time . . . . . . . . . . . . . . . . . . . . . .38

Table 1-9 U2000 Series settling time . . . . . . . . . . . . . . . . . . . . . .39

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20 Keysight N1913/1914A Service Guide

Keysight N1913/1914A EPM Series Power Meters
Service Guide

1 Specifications and

Characteristics

Introduction 22

Recommended Calibration Interval 23

Power Meter Specifications 24

Power Sensor Specifications 25

Power Meter Supplemental Characteristics 30

Settling Time 35

Measurement Characteristics 41

Rear Panel Inputs and Output Connections 42

1 mW Power Reference 43

Battery storage conditions 44

Physical Characteristics 45

This chapter describes the specifications and characteristics of your EPM Series
Power Meters.

21

1 Specifications and Characteristics

Introduction

This chapter details the EPM Series Power Meters specifications and
supplemental characteristics.

Specification definitions

There are two types of product specifications:

– Warranted specifications

– Characteristic specifications

Warranted specifications

Warranted specifications are covered by the product warranty and apply after a 30
minutes warm- up. These specifications are valid over the power meter’s
operating and environmental range unless otherwise stated and after performing
a zero and calibration.

Characteristic specifications

Supplemental characteristics which are shown in italics are intended to provide
information useful in applying the power meter by giving typical, but
non-warranted performance parameters. These characteristics are shown in
italics or denoted as “typical”, “nominal”, or “approximate”.

Characteristic information is representative of the product. In many cases, it may
also be supplemental to a warranted specification. Characteristic specifications
are not verified on all power meters. The types of characteristic specifications can
be placed in two groups:

– The first group of characteristic types describes 'attributes' common to all

products of a given model or option.

Examples of characteristics that describe 'attributes' are product weight, and
50 Ω input N-type connector. In these examples, product weight is an
approximate value and a 50 Ω input is nominal. These two terms are most
widely used when describing a product's 'attributes'.

– The second group of characteristic types describes 'statistically' the aggregate

performance of the population of products.

22 Keysight N1913/1914A Service Guide

These characteristics describe the expected behavior of the population of

products. They do not guarantee the performance of any individual product.

No measurement uncertainty value is accounted for in the specification. These

specifications are referred to as typical.

Conditions

The power meter and power sensor meet its specifications when:

– Stored for a minimum of two hours at a stable temperature within the

operating temperature range, and turned on for at least 30 minutes.

– The power meter and power sensor are within their recommended calibration

periods.

– Used in accordance to the information provided in the Keysight N1913/1914A

EPM Series Power Meters User's Guide.

Recommended Calibration Interval

Keysight Technologies recommends a two-year calibration cycle for the N1913/
1914A EPM Series Power Meters.

Specifications and Characteristics 1

Keysight N1913/1914A Service Guide 23

1 Specifications and Characteristics

Power Meter Specifications

Frequency Range

9 kHz to 110 GHz, power sensor dependent

Power Range

–70 dBm to +44 dBm (100 pW to 25 W), power sensor dependent

Power Sensors Compatibility

– Keysight 8480 Series power sensors

– Keysight E9300 E-Series average power sensors

– Keysight E4410 E-Series average power sensors

– Keysight N8480 Series power sensors

– Keysight U2000 Series average USB power sensors

Single Sensor Dynamic Range

– 90 dB maximum (Keysight E-Series power sensors)

– 50 dB maximum (Keysight 8480 Series power sensors)

– 55 dB maximum (Keysight N8480 Series power sensors)

– 80 dB maximum (Keysight U2000 Series USB power sensors)

Display Units

Absolute: Watts (W) or dBm

Relative: Percent (%) or dB

Display Resolution

Selectable resolution of: 1.0, 0.1, 0.01, and 0.001 dB in logarithmic mode; or 1, 2,
3, and 4 significant digits in linear mode

Default Resolution

0.01 dB in logarithmic mode or three digits in linear mode

24 Keysight N1913/1914A Service Guide

Power Sensor Specifications

Definitions

Zero Set

In any power measurement, the power meter must initially be set to zero with no
power applied to the power sensor. Zero setting is accomplished within the power
meter by digitally correcting for residual offsets.

Zero Drift

This parameter is also called long term stability and is the change in the power
meter indication over a long time (usually one hour) for a constant input power at
a constant temperature, after a defined warm-up interval.

Measurement Noise

This parameter is also known as short term stability and is specified as the change
in the power meter indication over a short time interval (usually one minute) for a
constant input power at a constant temperature.

Specifications and Characteristics 1

Accuracy

Instrumentation

Absolute accuracy
power sensor linearity specification in your power sensor manual to assess overall
system accuracy.)

Relative accuracy
sensor linearity specification in your power sensor manual to assess overall
system accuracy.)

Zero Set (digital settability of zero): Power sensor dependent (refer to Tab le 1-1
and Tab le 1-2). For Keysight E-Series power sensors, this specification applies
when zeroing is performed with the sensor input disconnected from the POWER
REF.

[1] Refer to the power sensor linearity specification in your power sensor manual to assess overall

system accuracy.

Keysight N1913/1914A Service Guide 25

[1]

: ±0.02 dB (Logarithmic) or ±0.5% (Linear). (Refer to the

[1]

: ±0.04 dB (Logarithmic) or ±1.0% (Linear). (Refer to the power

1 Specifications and Characteristics

Tab le 1-1 Zero set specifications

Power sensor

[b]

8481A

[b]

8481B

[b]

8481D

[b]

8481H

[b]

8482A

[b]

8482B

[b]

8482H

[b]

8483A

[b]

8485A

[b]

8485D

[b]

R8486A

[b]

R8486D

[b]

Q8486A

[b]

Q8486D

[b]

V8486A

[b]

W8486A

[b]

8487A

[b]

8487D

Zero set

±50 nW

±50 mW

±20 pW

±5 mW

±50 nW

±50 mW

±5 mW

±50 nW

±50 nW

±20 pW

±50 nW

±30 pW

±50 nW

±30 pW

±200 nW

±200 nW

±50 nW

±20 pW

[a]

E4412A ±50 pW

E4413A ±50 pW

E9300A ±500 pW

E9301A ±500 pW

E9304A ±500 pW

26 Keysight N1913/1914A Service Guide

Specifications and Characteristics 1

Table 1 -1 Zero set specifications (continued)

Power sensor

Zero set

E9300B ±500 nW

E9301B ±500 nW

E9300H ±5 nW

E9301H ±5 nW

N8481A (exclude Option CFT) ±25 nW

N8482A (exclude Option CFT)

N8485A (exclude Option CFT)

N8486A R (exclude Option CFT)

N8486A Q (exclude Option CFT)

N8487A (exclude Option CFT)

N8488A (exclude Option CFT)

N8481B (exclude Option CFT)

N8482B (exclude Option CFT)

N8481H (exclude Option CFT)

N8482H (exclude Option CFT)

N8481A with Option CFT

N8482A with Option CFT

N8485A with Option CFT

N8486A R with Option CFT

N8486A Q with Option CFT

N8487A with Option CFT

N8481B with Option CFT

N8482B with Option CFT

[b]

[b]

[b]

[b]

[b]

[b]

[b]

[b]

[b]

[b]

[b]

[b]

[b]

[b]

[b]

[b]

[b]

[b]

±25 nW

±25 nW

±25 nW

±25 nW

±25 nW

±25 nW

±25 µW

±25 µW

±2.5 µW

±2.5 µW

±63 nW

±63 nW

±63 nW

±63 nW

±63 nW

±63 nW

±63 µW

±63 µW

[a]

Keysight N1913/1914A Service Guide 27

1 Specifications and Characteristics

Tab le 1-1 Zero set specifications (continued)

Power sensor

N8481H with Option CFT

N8482H with Option CFT

[a] The zero set specifications are tested with Keysight 11730A power sensor cable, 1.5 m (7.5 ft).

[b] The zero set specifications are tested at 50 MHz.

[b]

[b]

Zero set

±6.3 µW

±6.3 µW

[a]

Tab le 1-2 Zero set (internal and external) for U2000 Series

Power sensor Range Zero set (internal) Zero set (external)

–60 dBm to –35 dBm ±1.5 nW ±600 pW

–38 dBm to –15 dBm ±2 nW ±1.5 nW

U2000/1/2A

U2004A

–20 dBm to –9 dBm ±12 nW ±10 nW

–11 dBm to –5 dBm ±2 µW ±500 nW

–7 dBm to 15 dBm ±4 µW ±1 µW

10 dBm to 20 dBm ±6 µW ±5 µW

–60 dBm to –35 dBm ±2.8 nW ±600 pW

–38 dBm to –15 dBm ±3 nW ±1.5 nW

–20 dBm to –9 dBm ±12 nW ±10 nW

–11 dBm to –5 dBm ±2 µW ±500 nW

–7 dBm to 15 dBm ±4 µW ±1 µW

10 dBm to 20 dBm ±6 µW ±5 µW

–50 dBm to –25 dBm ±15 nW ±8 nW

–28 dBm to –5 dBm ±20 nW ±20 nW

–10 dBm to 1 dBm ±120 nW ±100 nW

U2000/1/2H

–1 dBm to 5 dBm ±20 µW ±20 µW

3 dBm to 25 dBm ±40 µW ±30 µW

20 dBm to 30 dBm ±60 µW ±60 µW

28 Keysight N1913/1914A Service Guide

Specifications and Characteristics 1

NOTE

Table 1 -2 Zero set (internal and external) for U2000 Series (continued)

Power sensor Range Zero set (internal) Zero set (external)

–30 dBm to –5 dBm ±1.8 µW ±800 nW

–8 dBm to 15 dBm ±2 µW ±2 µW

U2000/1B

10 dBm to 21 dBm ±12 µW ±10 µW

19 dBm to 25 dBm ±2 mW ±1 mW

23 dBm to 44 dBm ±4 mW ±2 mW

The zero set specifications are only applicable to Keysight U2000 Series USB
power sensors with serial prefixes as shown below:

– U2000A serial prefix MY480/SG480 and above

– U2001A serial prefix MY481/SG481 and above

– U2002A serial prefix MY482/SG482 and above

– U2004A serial prefix MY484/SG484 and above

For power sensors with earlier prefixes, refer to the Keysight U2000 Series USB
Power Sensors Operating and Service Guide.

Keysight N1913/1914A Service Guide 29

1 Specifications and Characteristics

Power Meter Supplemental Characteristics

Zero Drift of Sensors

This parameter is also called long term stability and is the change in the power
meter indication over a long time (within one hour) at a constant temperature
after a 24-hour warm-up of the power meter.

Power sensor dependent (refer to Tab le 1-4).

Measurement Noise

Power sensor dependent (refer to Tab le 1-3 and Tab le 1-4).

Averaging effects on measurement noise. Averaging over 1 to 1024 readings is
available for reducing noise. Table 1-4 provides the measurement noise for a
particular power sensor with the number of averages set to 16 for normal mode
and 32 for x2 mode. Use the “Noise Multiplier” for the appropriate mode (normal
or x2) and number of averages to determine the total measurement noise value.

For example, for a Keysight 8481D power sensor in normal mode with the number
of averages set to 4, the measurement noise is equal to:

(<45 pW × 2.75) = <124 pW

Tab le 1-3 Noise multiplier

Number of averages 1 2 4 8 16 32 64 128 256 512 1024

Noise multiplier
(Normal mode)

Noise multiplier
(x2 mode)

5.5 3.89 2.75 1.94 1.0 0.85 0.61 0.49 0.34 0.24 0.17

6.5 4.6 3.25 2.3 1.63 1.0 0.72 0.57 0.41 0.29 0.2

Tab le 1-4 Power sensor specifications

Power sensor

Keysight 8481A

Keysight 8481B

Keysight 8481D

Zero drift

[d]

[d]

[d]

[a]

Measurement

<±10 nW <110 nW

<±10 mW <110 mW

<±4 pW <45 pW

[b]

noise

30 Keysight N1913/1914A Service Guide

Specifications and Characteristics 1

Table 1 -4 Power sensor specifications (continued)

Power sensor

Keysight 8481H

Keysight 8482A

Keysight 8482B

Keysight 8482H

Keysight 8483A

Keysight 8485A

Keysight 8485D

Keysight R8486A

Keysight R8486D

Keysight Q8486A

Keysight Q8486D

Keysight V8486A

Keysight W8486A

Keysight 8487A

Keysight 8487D

Zero drift

[d]

[d]

[d]

[d]

[d]

[d]

[d]

[d]

[d]

[d]

[d]

[d]

[d]

[d]

[d]

[a]

Measurement

<±1 mW <10 mW

<±10 nW <110 nW

<±10 mW <110 mW

<±1 mW <10 mW

<±10 nW <110 nW

<±10 nW <110 nW

<±4 pW <45 pW

<±10 nW <110 nW

<±6 pW <65 pW

<±10 nW <110 nW

<±6 pW <65 pW

<±40 nW <450 nW

<±40 nW <450 nW

<±10 nW <110 nW

<±4 pW <45 pW

Keysight E4412A <±15 pW <70 pW

Keysight E4413A <±15 pW <70 pW

Keysight E9300A

Keysight E9301A

Keysight E9304A

Keysight E9300B

Keysight E9301B

Keysight E9300H

[c]

[c]

[c]

[c]

[c]

[c]

<±150 nW <700 nW

<±150 nW <700 nW

<±150 nW <700 nW

<±150 nW <700 nW

<±150 nW <700 nW

<±1.5 nW <7 nW

[b]

noise

Keysight N1913/1914A Service Guide 31

1 Specifications and Characteristics

Tab le 1-4 Power sensor specifications (continued)

Power sensor

Keysight E9301H

Keysight N8481A (exclude Option CFT)

Keysight N8482A (exclude Option CFT)

Keysight N8485A (exclude Option CFT)

[c]

[d]

[d]

[d]

Keysight N8486A R (exclude Option CFT)

Keysight N8486A Q (exclude Option CFT)

Keysight N8487A (exclude Option CFT)

Keysight N8488A (exclude Option CFT)

Keysight N8481B (exclude Option CFT)

Keysight N8482B (exclude Option CFT)

Keysight N8481H (exclude Option CFT)

Keysight N8482H (exclude Option CFT)

Keysight N8481A with Option CFT

Keysight N8482A with Option CFT

Keysight N8485A with Option CFT

Keysight N8486A R with Option CFT

Keysight N8486A Q with Option CFT

Keysight N8487A with Option CFT

Keysight N8481B with Option CFT

Keysight N8482B with Option CFT

Keysight N8481H with Option CFT

Keysight N8482H with Option CFT

[d]

[d]

[d]

[d]

[d]

[d]

[d]

[d]

[d]

[d]

[d]

[d]

[d]

[d]

[d]

[d]

Zero drift

[a]

Measurement

[b]

noise

<±1.5 nW <7 nW

<±3 nW <80 nW

<±3 nW <80 nW

<±3 nW <80 nW

[d]

[d]

<±3 nW <80 nW

<±3 nW <80 nW

<±3 nW <80 nW

<±3 nW <80 nW

<±3 µW <80 µW

<±3 µW <80 µW

<±0.3 µW <8 µW

<±0.3 µW <8 µW

<±7 nW <114 nW

<±7 nW <114 nW

<±7 nW <114 nW

<±7 nW <114 nW

<±7 nW <114 nW

<±7 nW <114 nW

<±7 µW <114 µW

<±7 µW <114 µW

<±0.7 µW <11.4 µW

<±0.7 µW <11.4 µW

32 Keysight N1913/1914A Service Guide

Specifications and Characteristics 1

[a] Within one hour after zero set, at a constant temperature after a 24-hour warm-up of the power meter.

[b] The number of averages at 16 (for normal mode) and 32 (for x2 mode), at a constant temperature, measured over a

one minute interval and two standard deviations. For Keysight E-Series power sensors, the measurement noise is

measured within the low range. Refer to the relevant power sensor manual for further information.

[c] Specification applies to the low power path, up to 75% relative humidity.

[d] The zero drift and measurement noise specifications are tested at 50 MHz.

Table 1 -5 U2000 Series power sensors specification

Power sensor Range

–60 dBm to –35 dBm 200 pW 1 nW

–38 dBm to –15 dBm 400 pW 1.5 nW

–20 dBm to –9 dBm 1.5 nW 15 nW

U2000/1/2A

–11 dBm to –5 dBm 50 nW 650 nW

–7 dBm to 15 dBm 500 nW 1 µW

10 dBm to 20 dBm 2 µW 10 µW

–60 dBm to –35 dBm 200 pW 1 nW

–38 dBm to –15 dBm 400 pW 1.5 nW

–20 dBm to –9 dBm 1.5 nW 15 nW

U2004A

–11 dBm to –5 dBm 50 nW 650 nW

–7 dBm to 15 dBm 500 nW 1 µW

10 dBm to 20 dBm 2 µW 10 µW

–50 dBm to –25 dBm 2 nW 10 nW

–28 dBm to –5 dBm 4 nW 15 nW

–10 dBm to 1 dBm 15 nW 150 nW

U2000/1/2H

–1 dBm to 5 dBm 500 nW 6.5 µW

3 dBm to 25 dBm 5 µW 10 µW

20 dBm to 30 dBm 20 µW 100 µW

Zero drift

[a]

Measurement

[b]

noise

Keysight N1913/1914A Service Guide 33

1 Specifications and Characteristics

NOTE

Tab le 1-5 U2000 Series power sensors specification (continued)

Power sensor Range

–30 dBm to –5 dBm 200 nW 1 µW

–8 dBm to 15 dBm 400 nW 1.5 µW

U2000/1B

[a] Within one hour after zero set, at a constant temperature after a 24-hour warm-up of the power meter.

[b] The number of averages at 16 (for normal mode) and 32 (for x2 mode), at a constant temperature, measured over a

one minute interval and two standard deviations. For Keysight E-Series power sensors, the measurement noise is
measured within the low range. Refer to the relevant power sensor manual for further information.

10 dBm to 21 dBm 1.5 µW 15 µW

19 dBm to 25 dBm 50 nW 650 µW

23 dBm to 44 dBm 500 µW 1 mW

Zero drift

[a]

Measurement

[b]

noise

The zero drift and measurement noise specifications are only applicable to
Keysight U2000 Series USB power sensors with serial prefixes as shown below:

– U2000A serial prefix MY480/SG480 and above

– U2001A serial prefix MY481/SG481 and above

– U2002A serial prefix MY482/SG482 and above

– U2004A serial prefix MY484/SG484 and above

For power sensors with earlier prefixes, refer to the Keysight U2000 Series
Operating and Service Guide.

34 Keysight N1913/1914A Service Guide

Settling Time

+20 dB

+10 dB

150 ms

350 ms

550 ms

3.5 s

+10 dB

Normal

mode

150 ms

500 ms

1.1 s

6.6 s

x2

mode

Sensor
dynamic
range

Typical
settling
times

+10 dB

Max dBm

Min dBm

Specifications and Characteristics 1

For Keysight 8480 Series power sensors

0 to 99% settled readings over the GPIB.

Manual filter, 10 dB decreasing power step (refer to Table 1-6).

Auto filter, default resolution, 10 dB decreasing power step, normal and x2 speed
modes (refer to Figure 1-1).

Table 1 -6 8480 Series settling time

Number of averages 1 2 4 8 16 32 64 128 256 512 1024

Settling time (s)
(Normal mode)

Settling time (s)
(x2 mode)

0.15 0.2 0.3 0.5 1.1 1.9 3.4 6.6 13 27 57

0.15 0.18 0.22 0.35 0.55 1.1 1.9 3.5 6.9 14.5 33

Figure 1-1 8480 Series settling time with auto-filter

For Keysight E-Series power sensors

For E441X Series and E9300 Series power sensors in normal and x2 speed modes,
manual filter, 10 dB decreasing power step (refer to Table 1-7).

Keysight N1913/1914A Service Guide 35

Auto-filter, default resolution, 10 dB decreasing power step, normal and x2 speed
modes (refer to Figure 1-2 for E441X Series sensors and Figure 1-3 for E9300
Series sensors).

1 Specifications and Characteristics

+50 dB

+10 dB

70 ms

90 ms

450 ms

3.5 s

+10 dB

Normal

mode

80 ms

130 ms

1.1 s

6.7 s

x2

mode

Sensor
dynamic
range

Typical
settling
times

+10 dB

Max dBm

Min dBm

Tab le 1-7 E441x and E9300 Series settling time

[a]

Number of averages 1 2 4 8 16 32 64 128 256 512 1024

Settling time (s)
(Normal mode)

Settling time (s)
(x2 mode)

[a] E-Series power sensors in Fast mode (using free run trigger), within the range –50 dBm to +17 dBm, the settling

time is:

N1913A: 10 ms
N1914A: 20 ms

0.08 0.13 0.24 0.45 1.1 1.9 3.5 6.7 14 27 57

0.07 0.09 0.15 0.24 0.45 1.1 1.9 3.5 6.7 14 27

Figure 1-2 E441x Series settling time with auto-filter

36 Keysight N1913/1914A Service Guide

Specifications and Characteristics 1

+10 dBm

+2 dBm

40 ms

120 ms

210 ms

400 ms

–4 dBm

x2

mode

70 ms

210 ms

400 ms

1 s

Normal

mode

Sensor
dynamic
range

Typical
settling
times

–10 dBm

Max dBm

Min dBm

70 ms

120 ms

1 s

6.5 s

13 s

40 ms

70 ms

–20 dBm

–30 dBm

–40 dBm

–50 dBm

400 ms

3.4 ms

6.8 s

High power path

Low power path

Figure 1-3 E9300 Series settling time with auto-filter

Keysight N1913/1914A Service Guide 37

1 Specifications and Characteristics

+20 dB

+10 dB

150 ms

180 ms

400 ms

6.6 s

+10 dB

Normal

mode

150 ms

200 ms

1 s

13.5 s

x2

mode

Sensor
dynamic
range

Typical
settling
times

+10 dB

Max dBm

Min dBm

3.6 s +10 dB6.6 s

For Keysight N8480 Series power sensors

Typical Settling time: 0 to 99% settled readings over the GPIB.

Auto filter, default resolution, 10 dB decreasing power step, normal and x2 speed
modes (refer to Figure 1-4). Manual filter, 10 dB decreasing power step (refer to

Table 1-8).

Tab le 1-8 N8480 Series settling time

Number of averages 1 2 4 8 16 32 64 128 256 512 1024

Settling time (s)
(Normal mode)

Settling time (s)
(x2 mode)

0.15 0.2 0.3 0.5 1.1 1.9 3.4 6.6 13 27 57

0.15 0.18 0.22 0.35 0.55 1.1 1.9 3.5 6.9 14.5 33

Figure 1-4 N8480 Series settling time with auto-filter

38 Keysight N1913/1914A Service Guide

Specifications and Characteristics 1

For Keysight U2000 Series power sensors

In FAST mode (using Free Run trigger), for a 10 dB decreasing power step, the
settling time is 25 ms

Table 1 -9 U2000 Series settling time

[1]

.

Number of
averages

Settling time
(Normal mode)

Settling time
(x2 mode)

[a] Manual filter, 10 dB decreasing power step (not across the switching point)

[a]

[a]

1 2 4 8 16 32 64 128 256 512 1024

(s)

0.045 0.09 0.17 0.34 0.66 1.3 2.6 5.2 10.4 20.9 41.9

(s)

0.042 0.05 0.09 0.17 0.34 0.66 1.3 2.6 5.2 10.4 20.9

[1] When a power step crosses the auto-range switch point of the sensor, add 25 ms.

Keysight N1913/1914A Service Guide 39

1 Specifications and Characteristics

-50 dBm

+10 dBm

+2 dBm

-40 dBm

45 ms

90 ms

2.6 s

2.7 s

460 ms

2.8 s

39 s

42 s

42 s

-4 dBm

-10 dBm

-20 dBm

-30 dBm

Normal

mode

45 ms

82 ms

1.3 s

1.5 s

450 ms

1.6 s

20 s

24 s

24 s

x2

mode

Maximum sensor power

within a range

U2000/1/2/4A

U2000/1/2H U2000/1B

+20 dBm +40 dBm

+12 dBm +32 dBm

+6 dBm +26 dBm

0 dBm

-10 dBm

-20 dBm

-30 dBm

-40 dBm

+20 dBm

+10 dBm

0 dBm

-10 dBm

-20 dBm

Minimum sensor power

within a range

Sensor
dynamic
range

Typical
settling
times

0 dBm

0 dBm

+12 dBm

+10 dBm

Figure 1-5 U2000 Series settling time with auto-filter

40 Keysight N1913/1914A Service Guide

Measurement Characteristics

Measurement speed

Over the GPIB, three measurement speed modes are available as shown, along
with the typical maximum measurement speed for each mode:

– Normal: 20 readings/second

– x2: 40 readings/second

–Fast

Maximum measurement speed is obtained using binary output in free run trigger
mode.

[1]

: 400 readings/second, for Keysight E-Series power sensors only

Specifications and Characteristics 1

[1] For N1914A, if both channels are used in the fast mode, the measurement speed will be reduced

to 200 readings/second for each channel.

Keysight N1913/1914A Service Guide 41

1 Specifications and Characteristics

Rear Panel Inputs and Output Connections

Recorder output(s)

GPIB
USB 2.0
10/100Base-T LAN

Trigger input (optional)

Trigger out (optional)

Ground Binding post, accepts 4 mm plug or bare wire connection

USB host (optional) To connect U2000 Series power sensors

VGA out (optional)

Line power

Input voltage range

Input frequency range

Power requirement 70 VA (maximum)

Analog 0 to 1 V, 1 k

Interfaces allow communication with an external controller

Input has TTL compatible logic levels and uses a BNC
connector

Output provides TTL compatible logic levels and uses a BNC
connector

Standard 15-pin VGA connector, allows connection of external
VGA monitor

100 – 240 Vac
100 – 120 Vac
Automatic voltage selection
Fluctuations not exceeding ±10%

50 – 60 Hz (100 to 240 Vac)
400 Hz (100 to 120 Vac)

Ω output impedance, BNC connectors

42 Keysight N1913/1914A Service Guide

1 mW Power Reference

NOTE

The 1 mW Power Reference is provided for calibration of the E-Series, 8480
Series, and N8480 Series power sensors.

Power output

Accuracy

Frequency 50 MHz nominal

SWR

Connector type Type N (f), 50 Ω

Specifications and Characteristics 1

1.00 mW (0.0 dBm)
Factory set to ±0.4% traceable to the National Physical

Laboratories (NPL), UK

±1.2% (0 – 55 ºC)
±0.4% (25 ±10 ºC)

1.08 (0 - 55 ºC)

1.05 (typical)

Keysight N1913/1914A Service Guide 43

1 Specifications and Characteristics

NOTE

Battery storage conditions

Storage temperature limits: –20°C to 60°C, ≤ 80% RH

Refer to “Battery Information (Optional)” on page 90 of Keysight N1913/1914A
EPM Series Power Meters User’s Guide for more details on the battery pack.

44 Keysight N1913/1914A Service Guide

Physical Characteristics

Dimensions

The following dimensions exclude front and rear panel protrusions:

212.6 mm W x 88.5 mm H x 348.3 mm D

(8.5 in x 3.5 in x 13.7 in)

Weight

Specifications and Characteristics 1

N1913/1914A weight (net)

N1913/1914A weight (shipping)

≤

3.60 kg (approximately)

≤

8.20 kg (approximately)

Keysight N1913/1914A Service Guide 45

1 Specifications and Characteristics

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46 Keysight N1913/1914A Service Guide

Keysight N1913/1914A EPM Series Power Meters
Service Guide

2 Performance Tests

Introduction 48

Complete Equipment List 49

1 mW Power Reference Level Test 51

Output Standing Wave Ratio (SWR) Test 53

Zero Set (Average Path) 56

Absolute Accuracy Test (Average Path) 57

Linearity (Average Path) 61

This chapter contains procedures that allows you to test the power meter’s
electrical performance to its specifications.

47

2 Performance Tests

NOTE

Introduction

The performance tests described in this chapter test the power meter’s electrical
performance against the specifications detailed in Chapter 1. They are used for
incoming inspection, during calibration cycle (also called periodic maintenance),
or after repairs have been made.

– This document does not provide a complete breakdown for these tests; it only

gives a brief overview of each, in line with Keysight’s recommendation that
the Keysight N7800 Series calibration software should be used at all times.

– Performance testing is limited to the measurement and verification of

warranted specifications.

– Some tests cannot be performed manually, and so the N7800 Series

calibration software is essential.

– Measurement uncertainty will not be addressed in this document (this is

handled by the N7800 Series software).

The following performance tests are described in this chapter:

– “1 mW Power Reference Level Test” on page 51

– “Output Standing Wave Ratio (SWR) Test” on page 53

– “Zero Set (Average Path)” on page 56

– “Absolute Accuracy Test (Average Path)” on page 57

– “Linearity (Average Path)” on page 61

48 Keysight N1913/1914A Service Guide

Complete Equipment List

Performance Tests 2

Instrument Critical specifications Recommended Keysight

model number

Meters

Power Meter Dual channel

Absolute accuracy: 0.5%

Power reference accuracy: 0.9% – (a best

capability measurement is required for the

power reference output — the power level

must be accurately measured, and the

uncertainty of this measurement must also be

known)

Power Sensor Frequency: 50 MHz

Amplitude range: –70 dBm to –20 dBm

SWR: 1.15 at 50 MHz

Power Sensor Frequency: 50 MHz

Amplitude range: –30 dBm to +20 dBm

SWR: 1.1 at 50 MHz

Power Sensor Frequency: 50 MHz

Amplitude range: –70 dBm to +20 dBm

SWR: 1.06 maximum

Attenuator

20 dB Fixed Attenuator N-type (m,f) 8491B (Option 020)

E4419B E4419A

8481D

N8482A 8482A

E4412A

Alternative Keysight
model number

Keysight N1913/1914A Service Guide 49

2 Performance Tests

Instrument Critical specifications Recommended Keysight

model number

Miscellaneous

Power Splitter Frequency: DC to 18 GHz insertion

Loss: 7 dB
Equivalent output SWR: 1.20 DC to 8 GHz

Coaxial Termination DC to 18 GHz 909A

BNC Cable Cable Assy-Coaxial RG/223 cable 50-Ohm

straight BNC male to straight BNC 24-in LG

Calibration Test Cable
required for N1913A and
N1914A

Sensor Cable 85032B

N-Type Calibration Kit 85032B

Assorted accessories (cables and adapters) required

11667A (Option 001)

8120-1839

11730A

Alternative Keysight
model number

50 Keysight N1913/1914A Service Guide

1 mW Power Reference Level Test

Ch A

N1913/1914A

POWER METER

E4419B/E4417A
POWER METER

NOTE

Description

The 1 mW power reference is used for the calibration of 8480 Series, N8480 Series
and E-Series power sensors, and is traceable to national standards. This test uses
an N8482A power sensor to transfer the power measured on an accurately
calibrated E4419B or E4417A power meter to the DUT reference.

Equipment

– Required test equipment:

– 1 unit of E4419B or E4417A dual channel power meter

– 1 unit of N8482A power sensor

– 11730A power sensor cable

– Either of these E4419B or E4417A power meters can be used. This specific

power meter model must be used.

Performance Tests 2

Figure 2-1 1 mW power reference level test setup connection diagram

For rear panel options, the connections will differ from the illustration shown
here. Refer to the connector identification markings on the rear panel for further
details.

Keysight N1913/1914A Service Guide 51

2 Performance Tests

NOTE

Test method

1 Enter the recorded measurement uncertainty of the E4419B or E4417A 1 mW

power reference.

2 Using the E4419B or E4417A power meter and the N8482A sensor, measure

the 1 mW power reference of the E4419B or E4417A.

3 Using the E4419B or E4417A power meter and the N8482A sensor, measure

the 1 mW power reference of the DUT.

4 Using all of these values, the N7800 Series software will calculate the power

reference level of the DUT.

– The 1 mW reference of the E4419B or E4417A power meter must be precisely

calibrated at a standards accredited lab, and the uncertainty of this
measurement known.

– Anyone who has a basic understanding of metrology should be able to

perform this test manually; it is simply the transfer of known power level with
a known calibration uncertainty to the DUT.

– An adjustment is available for this test if it fails (see Chapter 3,

"Adjustments").

52 Keysight N1913/1914A Service Guide

Output Standing Wave Ratio (SWR) Test

Description

Connector mismatch is the largest single contributor to measurement uncertainty,
so this specification must be warranted to provide assurance of instrument
accuracy. The 1 mW power reference level test must be carried out prior to this
test, as the VSWR specification is only valid at 1 mW. This test measures VSWR by
equating relative powers (measured by the test system power meter and its
sensors) when the power reference is exercised under different load conditions.

Equipment

– Required test equipment:

– 1 unit of 8753ES/ET network analyzer

– 1 unit of 85032B Type N calibration kit

– 1 unit of E4419B or E4417A dual channel power meter

– 2 units of 8481D power sensor

Performance Tests 2

– 2 units of 11667A #001 power splitter

– 1 unit of 20 dB pad, male to female (e. g. 8491A)

– 1 unit of 30 dB pad (e. g. 11708A reference attenuator)

– 2 units of 11730A power sensor cable

– An alternative network analyzer can be used, as long as it can measure S11 in

the 45 MHz to 55 MHz range

– These specific models of power sensors and power splitters must be used

– Any type of pad can be used (as long as there are no additional mating

connections, or differing pad values)

– 1 unit of 11667A, 1 unit of 8481D, and the 30 dB pad combine to create the

‘Calibration System’

– 1 unit of 11667A, 1 unit of 8481D, and the 20 dB pad combine to create the

‘Measurement System’

Keysight N1913/1914A Service Guide 53

2 Performance Tests

POWER METER

POWER SENSOR

Load Port

20 dB

TYPE N
MALE PORT

ATTE NUATOR

30 dB

ATTENUATOR

POWER
SPLITTERS

Ch A

CH B

Ch A

POWER METER

EPM SERIES

POWER METER

POWER SENSOR

N-TYPE
MALE OPEN

Load Port

20 dB

ATTE NUATO R

Ch A

POWER METER

POWER SENSOR

N-TYPE
MALE LOAD

Load Port

20 dB

ATTE NUATO R

EPM SERIES

POWER METER

Figure 2-2 System calibration connection diagram

Figure 2-3 Output SWR test setup-open connection d iagram

54 Keysight N1913/1914A Service Guide

Figure 2-4 Output SWR test setup-load connection d iagram

NOTE

For rear panel options, the connections will differ from the illustration shown

NOTE

here. Refer to the connector identification markings on the rear panel for further
details.

Test method

1 Obtain the S11 parameter of the calibration system.

2 Connect the measurement system to the calibration system and obtain its S21

(load) and S21 (open) parameters.

3 Using only the measurement system, terminated with the OPEN connector

from the 85032B calibration kit, measure the 1 mW power reference level of

the DUT.

4 Remove the OPEN connector from the measurement system, terminate it with

the 50 R load from the 85032B calibration kit, and repeat the 1 mW power

reference level measurement.

5 Using all of these values, the N7800A Series software will calculate the VSWR

of the power reference output.

Performance Tests 2

– This test cannot be performed manually, due to the complexity of the

equipment calibration procedure, and the complexity of the measurement

algorithm.

– No adjustment is available for this test if it fails (see Chapter 5,

"Troubleshooting Guide").

Keysight N1913/1914A Service Guide 55

2 Performance Tests

NOTE

Zero Set (Average Path)

Description

Zero set is defined as the amount of residual offset error that is present following a
zero operation. This offset error is caused by contamination from several sources,
including circuit noise. This test measures the effectiveness of zero set by
performing 15 back-to-back zero operations of the average path (with no sensor
attached), after which the standard deviation of the results is calculated and
returned as the measured value.

Equipment

No test equipment required

Test method

1 Execute the internal zero set measurement procedure for channel A.

2 Read back the result of the measurement from the DUT.

3 If the DUT model number is N1914A, then repeat this procedure for channel B.

4 The test will take a few minutes to complete.

5 The measurement result should be less than 0.0000175. The smaller the

measurement result, the smaller the amount of residual offset error.

This test can be performed manually via the commands:

SERV:BIST:CW[1|2]:ZSET

SERV:BIST:CW[1|2]:ZSET:NUM?

(Refer to the N1913/1914A EPM Series Power Meters Programming Guide for
further details on the use of these commands)

56 Keysight N1913/1914A Service Guide

Absolute Accuracy Test (Average Path)

Description

The absolute accuracy test checks the ability of the power meter to accurately
measure the power sensor voltage and display the appropriate power level.

Equipment

– Required test equipment:

– 1 unit of 3458A digital multimeter

– 1 unit of 33250A function generator

– 1 unit of 11683A (Option H01) range calibrator

– 1 unit of 11730A power sensor cable

– 2 units of 10503A BNC cable

– 1 unit of BNC T-joint connector (BNC female, male, female)

– 1 unit of BNC (female) to dual banana connector

Performance Tests 2

Keysight N1913/1914A Service Guide 57

2 Performance Tests

11683A range

calibrator front panel

11683A range

calibrator rear panel

BNC T-joint connector

BNC cable

BNC cable

Banana

connector

Banana

connector

33250A function

generator

3458A digital

multimeter

N1913/1914A EPM

Series power meters

NOTE

58 Keysight N1913/1914A Service Guide

Figure 2-5 Absolute accuracy test setup

The procedure details the key presses required on the Keysight N1913A EPM
Series power meters. For the Keysight N1914A EPM Series power meters, the
equivalent key presses should be performed on both channels.

Test Method

1 Connect the equipment as shown in Figure 2-5.

2 Unplug the power cord from the range calibrator. Eliminate ground loops to

enable the 11683A (Option H01) range calibrator to operate properly.

Performance Tests 2

NOTE

NOTE

Disconnect the power cord to stop the operation of the range calibrator as the

range calibrator will continue to operate with no power applied.

When switching the range calibrator to STANDBY, allow enough time for the
range calibrator to settle to its zero value before attempting to zero the Keysight
N1913/1914A EPM Series power meters. This settling would appear on the
Keysight N1913/1914A EPM Series power meters display as downward drift.
When the drift has reached minimum, (typically less than 60 seconds), the range
calibrator is settled.

3 Turn on the voltmeter and allow it to warm up for 4 hours.

4 Turn on the DC source and allow it to warm up. Set the output voltage to 0 V.

5 Turn on the DUT and allow it to warm up for 30 minutes.

6 Ensure the range calibrator is not plugged in or powered on.

7 Connect the range calibrator to the DUT using the power meter interconnect

cable.

8 Connect the DC source to the range calibrator external voltage input and the

voltmeter using cables and a BNC T-joint connector at the range calibrator.

9 Configure the DUT as shown below.

Parameter Value

Filter/Averaging On

Filter Mode/Measurement Average Manual

Filter Length/Average Number 16

Resolution 4 digits

All other settings use the default setup settings. The *RST command sets the
default setup.

10 Configure the voltmeter using the default setup settings.

Keysight N1913/1914A Service Guide 59

2 Performance Tests

11 Perform a power meter zero on the DUT. The voltage of the range calibrator is

assumed to be 0 V.

12 Set the DC voltage to 89.6056 mV as measured by the voltmeter.

13 Perform a power meter calibration on the DUT.

14 Measure and record the absolute accuracy of the N1913/1914A in a table as

shown below.

Effective

power

-12 dBm 0.00565 V 0.1 V 256 ±0.5%

-5 dBm 0.02834 V 0.1 V 64 ±0.5%

5 dBm 0.28400 V 1 V 64 ±0.5%

8 dBm 0.56700 V 1 V 16 ±0.5%

10 dBm 0.90100 V 1 V 16 ±0.5%

12 dBm 1.43500 V 10 V 16 ±0.5%

14 dBm 2.29000 V 10 V 16 ±0.5%

16 dBm 3.66700 V 10 V 16 ±0.5%

17 dBm 4.65200 V 10 V 16 ±0.5%

18 dBm 5.91500 V 10 V 16 ±0.5%

19 dBm 7.53000 V 10 V 16 ±0.5%

20 dBm 9.62300 V 10 V 16 ±0.5%

DC Voltage

Voltmeter

range

Power meter filter /

voltmeter NRDNS

CH A % error CH B % error Specification

60 Keysight N1913/1914A Service Guide

Linearity (Average Path)

NOTE

Description

Linearity over the full input voltage range of the measurement path is warranted
to provide assurance of instrument accuracy. This test measures linearity by using
a calibration DAC and a calibration ADC (built into the DUT) to stimulate and
compare performance of the average path against the measurement ADC,
returning the worst case percentage error.

Equipment

No test equipment required

Test method

1 Execute the internal linearity measurement procedure for channel A.

2 Read back the result of the measurement from the DUT.

3 If the DUT model number is N1914A, then repeat this procedure for channel B.

4 The test will take a few minutes to complete.

Performance Tests 2

5 The measurement result should be less than 0.5 and greater than –0.5. The

optimum measurement result for this test is 0.

This test can be performed manually via the commands:

SERV:BIST:CW[1|2]:LIN

SERV:BIST:CW[1|2]:LIN:PERR?

(Refer to the N1913/1914A EPM Series Power Meters Programming Guide for
further details on the use of these commands)

Keysight N1913/1914A Service Guide 61

2 Performance Tests

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62 Keysight N1913/1914A Service Guide

Keysight N1913/1914A EPM Series Power Meters
Service Guide

3 Adjustments

Introduction 64

Power Reference Level Adjustment 65

This chapter contains checks and adjustments that ensure proper performance of
the power meter.

63

3Adjustments

Introduction

The adjustment attempts to correct the power reference level if the performance
test has failed. Power reference level is controlled by the coarse and fine settings
of a digital potentiometer. Adjustment of the coarse and fine settings can only be
carried out via remote commands. Adjustment can be carried out without having
to remove the outer covers from the DUT.

64 Keysight N1913/1914A Service Guide

Power Reference Level Adjustment

NOTE

Equipment

As per the test equipment list for the power reference level
performance test.

Test method

1 Set: Coarse = 834, Fine = 550

2 Measure power ref. level as per the performance test:

a If the result is > 1 mW, then increment COARSE by 1

b If the result is < 1 mW, then decrement COARSE by 1

3 Repeat step 2 until the result crosses the 1 mW boundary (in either direction)

4 Measure power ref. level as per the performance test:

a If the result is > 1 mW, then decrement FINE by 1

a If the result is < 1 mW, then increment FINE by 1

Adjustments 3

5 Repeat step 4 until the result crosses the 1 mW boundary (in either direction)

6 The adjustment is completed

– This adjustment can be performed manually via the commands:

SERV:CAL:ADJ:COUR <value>

SERV:CAL:ADJ:COUR?

SERV:CAL:ADJ:FINE <value>

SERV:CAL:ADJ:FINE?

(Refer to the Keysight N1913/1914A EPM Series Power Meters Programming

Guide for further details on the use of these commands.)

– COARSE and FINE values are valid in the range of 0 to 1023

– If adjustment is not possible, then a fault may be present in the DUT (see

Chapter 5, "Troubleshooting Guide").

Keysight N1913/1914A Service Guide 65

3Adjustments

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66 Keysight N1913/1914A Service Guide

Keysight N1913/1914A EPM Series Power Meters
Service Guide

4 Theory of Operation

PPMC Assembly 68

Main Board Assembly 69

Calibrator Assembly 70

Front Panel Assembly 71

PSU Assembly 72

This chapter describes how each of the power meter’s individual assemblies
operate.

67

4 Theory of Operation

PPMC Assembly

Purpose

– Provides the main processor and memory for the power meter

– Provides external interfaces for LAN and USB

– Stores the power meter firmware in flash EEPROM

– Stores the power meter serial number and option data

Inputs

– Power supplies [from PSU, via main board]

– Control and data lines [from main board and front panel]

– LAN/USB communications [from external equipment]

– GPIB communications [from external equipment, via main board]

Outputs

– Control address and datalines [to main board and front panel]

68 Keysight N1913/1914A Service Guide

Main Board Assembly

Purpose

– Provides the average measurement path(s)

– Provides external trigger input/output and recorder output(s)

– Provides the driver and the LVDS serialiser for the LCD display

– Provides signal routing between the PPMC and front panel

Inputs

– Power supplies [from PSU]

– Sensed power level(s) [from sensor flex(s)]

– Trigger input [from external equipment]

– Control, address, and data lines [from PPMC]

Outputs

Theory of Operation 4

– Processed average path measurement [to PPMC]

– Trigger output and recorder output(s) [to external equipment]

– LVDS LCD display control lines [to front panel]

– Control and data lines [to PPMC]

Keysight N1913/1914A Service Guide 69

4 Theory of Operation

Calibrator Assembly

Purpose

– Provides a 1 mW (0 dBm) power reference level at 50 MHz

Inputs

– Power supplies [from PSU, via main board]

– Control, address, and data lines [from PPMC]

Outputs

– 1 mW (0 dBm) power reference [to external equipment]

– Control and data lines [to PPMC, via main board]

70 Keysight N1913/1914A Service Guide

Front Panel Assembly

NOTE

Purpose

– Provides a keypad as the manual user interface

– Provides an LCD display to assist with manual setups and measurements

– Provides mounting for the sensor and power reference connectors (Option

101)

Inputs

– Power supplies [from PSU, via main board]

– Front panel control interface [from the PPMC LVDS LCD control lines, via main

board]

– Front USB port available for Option 008 (this USB port can only be used for

U2000 Series power sensors)

Front USB port is not to be used with USB flash storage devices.

Theory of Operation 4

Outputs

– Keypress data [to PPMC, via main board]

– Information on the LCD display

– Control and data lines [to PPMC, via main board]

Keysight N1913/1914A Service Guide 71

4 Theory of Operation

PSU

Charger
+ Battery

Switching
regulation,
distribution
and filtering

Battery Option

+

1

2

V

–

1

2

V

+

5

V

–

5

V

+

3

.

3

V

PSU Assembly

Purpose

– Provides various DC power supplies

Inputs

– 100 Vac ~240 Vac, 50 Hz ~60 Hz, 150 VA Max [from an external source]

– Control lines [from front panel, via main board]

Outputs

72 Keysight N1913/1914A Service Guide

Keysight N1913/1914A EPM Series Power Meters
Service Guide

5 Troubleshooting Guide

Introduction 74

Power-Up Problems 74

Instrument Self-Test 75

Extended Self-Test 76

Performance Test 76

Power Reference Level Adjustment Problems 76

Communication Interface Failures 77

Additional Diagnostic Tests 77

This chapter contains troubleshooting procedures for the EPM Series Power
Meters.

73

5 Troubleshooting Guide

Introduction

This chapter contains general troubleshooting guide to detect failures for the EPM
Series Power Meters.

Power-Up Problems

Basic external checks

– Check that the mains power source is live

– Check that the mains fuse is operational

– Check the mains cable for any obvious damage

– Check that the line module fuse in the instrument is operational

Basic internal checks

– Check/reseat the cable between the line module and the PSU

– Check/reseat the cable between the PSU and the main board

– Green LED DS1: If this is off, then the PSU may be faulty

– Green LED DS4: This should come on when the power button is pressed

– Green LEDs DS2/DS3: These will flash on and off during normal operation

Possible faults

–PSU

– Main board

– Front panel (defective keymat, key flex circuit, or display)

– Loose front panel cable (connection to main board)

74 Keysight N1913/1914A Service Guide

Troubleshooting Guide 5

Instrument Self-Test

Instrument Purpose Debug tips Possible faults

Test point voltages Checks that all of the supply voltages

are present

Calibrator Verifies that the calibrator is working

(Note: This test does not check that
the calibrator meets its
specifications)

Fan Verifies that the fan is working Check/reseat the cable between the

RTC battery Checks that the lithium manganese

battery on the main board is working

CW path/ChA CW path Verifies that the average path of

channel A is working
(Note: This does not prove that the

average path meets its
specifications)

ChB CW path Verifies that the average path of

channel B is working
(Note: This does not prove that the

average path meets its
specifications)

Replace the PSU to see if this clears
the faults

Check/reseat that cable between the
calibrator assembly and the main
board

Attempt to adjust the 1 mW power
reference level

fan assembly and the main board
Check visually if the fan is functioning

Replace the battery to see if this
clears the fault

Not applicable Main board

Not applicable Main board

PSU (low probability)
Main board (high

probability)

Calibrator assembly
(high probability)

Main board (low
probability)

Fan assembly (high
probability)

Main board (low
probability)

Lithium manganese
battery (high
probability)

Main board (low
probability)

Keysight N1913/1914A Service Guide 75

5 Troubleshooting Guide

Extended Self-Test

Instrument Purpose Debug tips Possible faul ts

Front panel (defective
keymat or key flex
circuit)

Front panel (defective
display, display
interface board, or
inverter board)

Keypad

Bitmap display

Verifies the operation of every key
(apart from the power button)

Verifies that all pixels in the display
can be illuminated in various colors

Not applicable

Not applicable

Performance Test

Type of failures Debug tips Possible faults

1 mW power reference level failures Attempt to adjust the 1 mW power

reference level

VSWR failures Not applicable Calibrator assembly

Calibrator assembly (high probability)
Main board (low probability)

Zero set (average Path) failures Not applicable Main board

Linearity (average path) failures Not applicable Main board

Power Reference Level Adjustment Problems

Possible faults

– Calibrator assembly (high probability)

– Main board (low probability)

76 Keysight N1913/1914A Service Guide

Troubleshooting Guide 5

Communication Interface Failures

Type of communication Debug tips Possible faul ts

GPIB communication Check/reseat the ribbon cable

connecting the PPMC to the main board

LAN/USB communication Check visually to see whether or not the

connector is obstructed/damaged

Ribbon cable (low probability)
Main board (high probability)

PPMC assembly

Additional Diagnostic Tests

Type of functionality Reason Recommended test method Possible faults

USB/LAN functionality The N7800 Series software only tests

functionality over GPIB

Sensor functionality The N7800 Series software does not

prove both paths of the sensor flex
assembly

Check the DUT responds when *RST
is sent to it via the USB/LAN
interfaces

Connect an E4412A sensor to the
DUT and ensure it can be zeroed/
calibrated

PPMC assembly

Sensor flex assembly

Keysight N1913/1914A Service Guide 77

5 Troubleshooting Guide

THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.

78 Keysight N1913/1914A Service Guide

Keysight N1913/1914A EPM Series Power Meters
Service Guide

6 Repair Guide

Introduction 80

Replaceable Parts 81

Tools Required 104

Required Torque Values for Fasteners 105

Disassembly Instructions 106

Reassembly Instructions 113

Disassembly vs Part Replacement 117

Front Panel Disassembly Instructions 119

Front Panel Reassembly Instructions 124

Additional Repair Notes 128

Main Board vs. Rear Panel Assembly 129

Replacing the PPMC Assembly 130

Replacing the Calibrator Semi-Rigid/Split Ferrite 131

This chapter details the power meter's replaceable parts. It also explains how to
assemble and disassemble the power meter.

79

6 Repair Guide

Introduction

This chapter contains details of some of the higher level components and
assemblies which can be ordered from Keysight Technologies. It also details how
to assemble and disassemble the power meter for repair. The contents included
are:

1 Replaceable Parts

2 Tools Required

3 Disassembly Instructions

4 Reassembly Instructions

5 Disassembly vs Part Replacement

6 Front Panel Disassembly Instructions

7 Front Panel Reassembly Instructions

8 Additional Repair Notes

9 Replacing the PPMC Assembly

10 Replacing the Calibrator Semi-Rigid/Split Ferrite

You can order replaceable parts from Keysight by contacting your local Keysight
Technologies Sales and Service Office.

You can return your power meter for servicing at a qualified service center. Refer
to Chapter 7, "Contacting Keysight Technologies".

80 Keysight N1913/1914A Service Guide

Replaceable Parts

Front panel assembly

Main assembly

The standard N1913/1914A power meter has the reference calibrator at the front
panel. An option is available to move the reference calibrator to the rear panel.

Keysight part number Description Visual

Repair Guide 6

N1914-60200
N1914-60201

N1914-60203 Front panel assembly (rear calibrator option)

Front panel assembly (front calibrator option)

Front panel assembly - Front calibrator
Front panel assembly - Front calibrator and

USB

Note:
– The front panel assembly must be

customized to suit the hardware
configuration of the unit being repaired

– Refurbished front panel assembly are not

available

Front panel assembly - Rear calibrator

Keysight N1913/1914A Service Guide 81

6 Repair Guide

Customization details

The standard EPM Series Power Meters has an input sensor connector(s) and a
reference calibrator connector on the front panel. Option 003 is available to move
the input sensor connector(s) and reference calibrator connector to the rear panel.
Below are the customization details on front panel assembly.

Connector option Details Part number

N1913A (Front connectors option)

1 unit of sensor flex assembly
1 unit of calibrator plug
1 unit of PLUG-HOLE TR-HD FOR

.688-D-HOLE NYL
1 unit of blank front panel dress label
1 unit of N1913A nameplate

N1913-67300
N1912-21003
6960-0024

N1912-00027
N1913-34300

N1913A (Rear connectors option)

N1914A (Front connectors option)

N1914A (Rear connectors option)

2 units of PLUG-HOLE TR-HD FOR
.688-D-HOLE NYL

1 unit of front panel plug (small)
1 unit of blank front panel dress label
1 unit of N1913A nameplate

2 units of sensor flex assembly
1 unit of calibrator plug
1 unit of blank front panel dress label
1 unit of N1914A nameplate

2 units of PLUG-HOLE TR-HD FOR
.688-D-HOLE NYL

1 unit of front panel plug (small)
1 unit of blank front panel dress label
1 unit of N1914A nameplate

6960-0024

N1912-21005
N1914-34302
N1913-34300

N1913-67300
N1912-21003
N1912-00027
N1914-34300

6960-0024

N1912-21005
N1912-00025
N1914-34300

82 Keysight N1913/1914A Service Guide

Customization parts

E4418-00044

E4418-00045

N1912- 21005

Keysight part number Description Visual

N1913-67300
(Front panel - Long)

N1913-67301
(Rear panel - short)

N1912-21003 Calibrator plug

Sensor flex assembly

Note:
– The same assembly is used for all four

sensor positions

– The sensor flex assembly is supplied

straight, and so it must be folded to match
the assembly being replaced (see

“Additional Repair Notes” on page 128)

Power sensor cable assembly - Front
Power sensor cable assembly - Rear

Repair Guide 6

N1912-21005 Plug - Front panel small

Keysight N1913/1914A Service Guide 83

6 Repair Guide

N1914-34302

N1912-00027

Keysight part number Description Visual

N1914-34302
N1912-00027

Label dual channel - Rear cal
Label - Dual

N1913-34300
N1914-34300

N1913A name plate
N1914A name plate

84 Keysight N1913/1914A Service Guide

Replaceable parts

Keysight part number Description Visual

N1913-40200 Front panel

Note:

This front panel sub-frame is used on all
variants of the front panel assembly

N1913-36600 Display support

Note:

This display support molding is used on all
variants of the front panel assembly

Repair Guide 6

N1913-38300 Keypad

Note:

This keypad is used on all variants of the front
panel assembly

Keysight N1913/1914A Service Guide 85

6 Repair Guide

Keysight part number Description Visual

N1913-66503 Key flex circuit

Note:

This key flex circuit is used on all variants of
the front panel assembly

N1912-20005 Window EMI shield

Note:

This EMI Shielded Window is used on all
variants of the Front Panel Assembly

N1913-00600 EMI screen

Note:

This EMI screen is used on all variants of the
front panel assembly

86 Keysight N1913/1914A Service Guide

Keysight part number Description Visual

2090-0825 Sharp display

Note:
This display is used on all variants of the front

panel assembly

Front view

Rear view

Repair Guide 6

N1912-60002 Display interface board

Note:
This display interface board is used on all

variants of the front panel assembly

Keysight N1913/1914A Service Guide 87

6 Repair Guide

Keysight part number Description Visual

0950-4111 Inverters 5-Watt 1-output

Note:
This inverter interface board is used on all

variants of the front panel assembly

N1912-61002 Cable assembly backlight

Note:
This backlight cable is used on all variants of

the front panel assembly

N1912-00038 EMC split washer

88 Keysight N1913/1914A Service Guide

Keysight part number Description Visual

N1913-68303 USB assembly - Front

Note:
This USB assembly is only available for

Option 105, 106, and 167

Repair Guide 6

N1913-68301 (Single)
N1913-68302 (Dual)

8121-0936 Flat-Ribbon-Assy- 28-AWG 30-COND

USB assembly - Single
USB assembly - Dual

03-IN-LG

Note:
This flat ribbon cable is used on all variants of

the front panel assembly

Keysight N1913/1914A Service Guide 89

6 Repair Guide

Main board assembly

Keysight part number Description Visual

N1913-66502 N1913A mother board [New]

N1914-66502 N1914A mother board [New]

Note:
– Refurbished main boards are not available
– The part number for the Lithium

Manganese battery (upper- right of both
photographs) is 1420-0394

90 Keysight N1913/1914A Service Guide

PPMC (Processor PCI Mezzanine) assembly

Keysight part number Description Visual

– N1913-66501
(Tested single channel

processor peripheral
component
interconnect mezzanine
card PCA)

– N1914-66501
(Tested dual channel

processor peripheral
component
interconnect mezzanine
card PCA)

Note:
– The same assembly is used for both

N1913A and N1914A models

– N1913-66501 (Tested single channel

processor peripheral component
interconnect mezzanine card PCA) comes
pre-programmed with N1913A firmware

– N1914-66501 (Tested dual channel

processor peripheral component
interconnect mezzanine card PCA) comes
pre-programmed with N1914A firmware

– Refurbished PPMC Assemblies are not

available

– The PPMC assembly must be programmed

once it has been installed (see“Additional

Repair Notes” on page 128)

– Ribbon Cable 8121-1076 is supplied

separately

Repair Guide 6

Keysight N1913/1914A Service Guide 91

6 Repair Guide

Keysight part number Description Visual

PSU [New]

N1913-00100
(Non-battery option)

N1913-00105
(Battery option)

0950-5015

N1913-34102

N1913-37900 Battery pack

Deck assembly

Deck assembly - Battery option

Power supply AC-DC Adapter 120-WATT
1-OUTPUT

Power supply cover

N1913-61301
N1913-61604

Ribbon cable assembly - PSU
Cable assembly - PSU

92 Keysight N1913/1914A Service Guide

Rear panel assembly

Main assembly

Keysight part number Description Visual

N1913-00200 Rear panel assembly [New]

Revised rear panel assembly [New]

Note:
– The rear panel assembly must be

customized to suit the hardware
configuration of the unit being repaired

– Refurbished rear panel assemblies are not

available

– The same assemblies are used for both

N1913A and N1914A models

Repair Guide 6

Keysight N1913/1914A Service Guide 93

6 Repair Guide

Customization details

The standard EPM Series Power Meters has an input sensor connector(s) and a
reference calibrator connector on the front panel. Option 003 is available to move
the input sensor connector(s) and reference calibrator connector to the rear panel.
Below are the customization details on the rear panel assembly.

Connector option Details Part number

N1913A (Front connectors option)

N1913A (Rear connectors option)

N1914A (Front connectors option)

N1914A (Rear connectors option)

1 unit of rear panel plug (BNC)
2 units of rear panel plug (Sensor)
1 unit of rear panel plug (Calibrator)

1 unit of sensor flex assembly
1 unit of N-type connector
1 unit of lock washer
1 unit of Hex nut
1 unit of washer
1 unit of rear panel plug (BNC)
1 unit of rear panel plug (Sensor)

2 units of recorder output cable
2 units of rear panel plug (Sensor)
1 unit of rear panel plug (Calibrator)

2 units of sensor flex assembly
1 unit of N-type connector
1 unit of lock washer
1 unit of Hex nut

6960-0081
6960-0024
6960-0178

N1913-67300
E4418-20009
E4418-00016
2950-0132
3050-0916
6960-0081
6960-0024

E4418-61015
6960-0024
6960-0178

N1912-61806
E4418-20009
E4418-00016
2950-0132

94 Keysight N1913/1914A Service Guide

Customization parts

050-0916

2950-0132

E4418-00016

E4418-20009

Keysight part number Description Visual

E4418-20009
E4418-00016
2950-0132
3050-0916

N- Type connector
Lock washer
Hex nut
Washer

Repair Guide 6

N1913-67300
N1913-67301

E4418-61015 Recorder output cable

Sensor flex assembly

Keysight N1913/1914A Service Guide 95

6 Repair Guide

Keysight part number Description Visual

N1913-67912 BNC option

6960-0081
6960-0024
6960-0178
N1913-36200
N1913-36201
N1913-36202

BNC plug (rear panel)
Sensor plug (front and rear panels)
Calibrator plug (rear panel)
USB plug (front panel)
USB plug (rear panel)
VGA plug (rear panel)

96 Keysight N1913/1914A Service Guide

Additional spare parts

Keysight part number Description Visual

N1913-62700 Line module assembly

N1913-67910 VGA option

Repair Guide 6

Keysight N1913/1914A Service Guide 97

6 Repair Guide

Keysight part number Description Visual

N1912-00016 Spring contact - Perpendicular

N1913-61601
N1913-61600
N1913-60002

Wire hardness assembly - 10 to10 Pins
Ribbon cable assembly - 6 to 4 Pins
PCA - Battery charger

98 Keysight N1913/1914A Service Guide

Calibrator assembly

Keysight part number Description Visual

N1913-62000 Calibrator assembly - Front

(Front connectors option)
For more information on the improved

calibrator assembly, refer to “Improved

calibrator assembly” on page 100.

N1911-61002 Calibrator assembly (Rear connectors option)

Note:
Semi-rigid cable N1912-61004 is not

included with assembly N1911-61002; if this
is required, it is available as a separate item

Repair Guide 6

Keysight N1913/1914A Service Guide 99

6 Repair Guide

NOTE

Improved calibrator assembly

Calibrator assembly

Improved calibrator assembly

The N1913/1914A calibrator assembly is improved with a new type-N calibrator
connector for a better fit with the front panel assembly as shown in Figure 6-1.
The calibrator plug (N1912-21003) will not be needed with the improved
calibrator assembly.

The N1913/1914A performance will not be affected with the improved calibrator
assembly.

100 Keysight N1913/1914A Service Guide

Figure 6-1 Calibrator assembly and improved calibrator assembly