Agilent N1923/4A
Wideband Power Sensor
Service Guide
Agilent Technologies
Notices
CAUTION
WARNING
© Agilent Technologies, Inc. 2011
No p art o f this manu al may be re produce d 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 Agilent
Technologies, Inc. as governed by United
States and international copyright laws.
Manual Part Number
N1923-90003
Edition
First Edition, Oct 31, 2011
Agilent Technologies, Inc.
5301 Stevens Creek Blvd.
Santa Clara, CA 95051 USA
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, Agilent disclaims all warranties,
either express or implied, with regard
to this manual and any information
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Safety Notices
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.
II N1923/4A Service Guide
Safety and Regulatory Symbols
The following symbols on the device and in the documentation indicate
precautions that must be taken to maintain safe operation of the device.
The C-Tick mark is a registered
trademark of the Spectrum
Management Agency of Australia.
This signifies compliance with the
Australian EMC Framework
Regulations under the terms of the
Radio Communications Act of 1992.
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.
This product complies with the
WEEE Directive (2002/96/EC)
marking requirement. This affixed
product label indicates that you must
not discard this electrical/electronic
product in domestic household waste.
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.
ICES/NMB-001 indicates that this
ISM product complies with the
Canadian ICES-001.
Cet appareil ISM est confomre a la
norme NMB-001 du Canada.
ISM GRP.1 Class A indicates that this
is an Industrial Scientific and Medical
Group 1 Class A product.
N1923/4A Service Guide III
General Safety Information
WARNING
CAUTION
The following general safety precautions must be observed during all
phases of operation, service, and repair of this device. Failure to comply
with these precautions or with specific warnings elsewhere in this manual
violates safety standards of design, manufacture, and intended use of the
device. Agilent Technologies assumes no liability for the customer’s failure
to comply with these requirements.
Before connecting the 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.
Repair or service that is not covered in this manual should only be
performed by qualified personnel.
IV N1923/4A Service Guide
Waste Electrical and Electronic Equipment (WEEE) Directive 2002/96/EC
This instruction complies with the WEEE Directive (2002/96/EC) marking
requirement. This affixed product label indicates that you must not discard
this electrical/electronic product in domestic household waste.
Product Category:
With reference to the equipment types in the WEEE Directive Annex 1, this
device 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 device, contact your nearest Agilent office, or visit
www.agilent.com/environment/product
for more information.
N1923/4A Service Guide V
Environmental Conditions
This device is designed for indoor use only. The following table shows the
general environmental requirements for this device.
Operating environment
Environmental conditions Requirements
Temperature 0°C to 55°C (Operating)
Humidity Maximum: 95% at 40°C (non-condensing)
Altitude Operating up to 3000 m (9840 ft)
Storage condition
Environmental conditions Requirements
Temperature –30°C to 70°C (Non-operating)
Humidity Non-operating up to 90% at 65°C
Altitude Non-operating up to 15420 m (50000 ft)
Minimum: 15% at 40°C (non-condensing)
(non-condensing)
Regulatory information
The N1923/4A wideband power sensor complies with the following
Electromagnetic Compatibility (EMC) requirements:
• IEC 61326-1:2005/EN 61326-1:2006
• Canada: ICES/NMB-001:Issue 4, June 2006
• Australia/New Zealand: AS/NZS CISPR11:2004
VI N1923/4A Service Guide
Declaration of Conformity (DoC)
NOTE
The Declaration of Conformity (DoC) for this device is available on the Web
site. You can search the DoC by its product model or description.
http://regulations.corporate.agilent.com/DoC/search.htm
If you are unable to search for the respective DoC, contact your local
Agilent representative.
N1923/4A Service Guide VII
In This Guide...
1 General Information
Chapter 1 provides the specifications and maintenance information of the
N1923/4A.
2 Performance Verification and Adjustments
Chapter 2 contains the performance verification procedures which verify
that the N1923/4A is operating within its published specifications. This
chapter also provides information on adjustments performed after a
performance verification fails.
3 Theory of Operation
Chapter 3 describes the operation and functions of the N1923/4A
assembly.
4Repair Guide
Chapter 4 contains information on repair and replaceable parts of the
N1923/4A. This chapter also explains how to assemble and disassemble
the N1923/4A.
5Contacting Agilent
Chapter 5 explains the appropriate actions to take if you have a problem
with your N1923/4A.
VIII N1923/4A Service Guide
Contents
1 General Information 1
Specifications and Characteristics 2
Cleaning 3
Connector care 3
2 Performance Verification and Adjustments 5
Equipment List 6
Voltage Standing Wave Ratio (VSWR) Performance Verification 7
Sensor Accuracy Performance Verification 8
System-Level Rise and Fall Time Performance Verification 11
Zero Set Performance Verification 15
Adjustments 17
3 Theory of Operation 19
Theory of Operation 20
4 Repair Guide 23
Repair 24
Replaceable Parts 25
Disassembly/Reassembly Procedure 27
Disassembly procedure 27
Reassembly procedure 27
5 Contacting Agilent 29
Introduction 30
Instrument serial numbers 30
Recommended calibration interval 31
Returning the N1923/4A for Service 32
Packaging the N1923/4A for shipment 32
N1923/4A Service Guide IX
X N1923/4A Service Guide
Agilent N1923/4A Wideband Power Sensor
Service Guide
1 General Information
Specifications and Characteristics 2
Cleaning 3
This chapter provides the specifications and maintenance information of
the N1923/4A wideband power sensor.
Agilent Technologies
1
1 Introduction
Specifications and Characteristics
For the N1923/4A specifications and characteristics, refer to the N1923/4A
User’s Guide.
2 N1923/4A Service Guide
Cleaning
CAUTION
Introduction 1
Use a clean, water- dampened cloth to clean the body of the N1923/4A.
Connector care
A solution of pure isopropyl or ethyl alchohol can be used to clean the
connector but make sure to keep in mind on its flammable nature.
• The RF connector beads deteriorate when contacted by hydrocarbon compounds
such as acetone, trichloroethylene, carbon tetrachloride, and benzene.
• Do not attempt to clean the connector with anything metallic such as pins or
paper clips.
• Clean the connector only at a static free workstation. Electrostatic discharge to the
center pin of the connector will render the N1923/4A inoperative.
Clean the connector face by first using a blast of compressed air. If the
compressed air fails to remove contaminants, use a foam swab dipped in
isopropyl or ethyl alcohol. If the swab is too big, use a round wooden
toothpick wrapped in a lint- free cloth dipped in isopropyl or ethyl alcohol.
N1923/4A Service Guide 3
1 Introduction
4 N1923/4A Service Guide
Agilent N1923/4A Wideband Power Sensor
Service Guide
2 Performance Verification and Adjustments
Voltage Standing Wave Ratio (VSWR) Performance Verification 7
Sensor Accuracy Performance Verification 8
System-Level Rise and Fall Time Performance Verification 11
Zero Set Performance Verification 15
Adjustments 17
This chapter contains the performance verification procedures which
verify that the N1923/4A is operating within its published specifications.
This chapter also provides information on adjustments performed after a
performance verification fails.
Agilent Technologies
5
2 Performance Verification and Adjustments
Equipment List
The following equipment are required for performance verification:
Equipment Critical specification Recommended Agilent model
number/part number
Signal generator
Oscilloscope Analog bandwidth: 1 GHz and above Infiniium MSO 9104A
Network analyzer
Peak power analyzer
Calibration kit Frequency range: DC to 18 GHz or above 85054A/85054D/85056A/85056D
Diode detector (negative) SMB connector 33334EZ
Power splitter
Power meter
Power sensor
Wideband power sensor
Power range: –50 dBm to +22 dBm at 1 GHz
Output resistance: 50 Ω
Frequency range: 10 MHz to 40 GHz or above
Dynamic range: 94 dB
Trace noise: <0.006 dB
Absolute accuracy: ±0.8%
Rise/fall time: <5 nsecs ± % error
Overshoot: 0.5%
Two-resistor type power splitter, N-type (f)
Maximum frequency: 18 GHz
Dual-channel peak power meter, compatible with
P-Series and N8480 Series power sensors
Absolute accuracy: ±0.8%
Frequency: 50 MHz or above
Power range: –30 dBm to +20 dBm
Standing wave ratio (SWR): ≤1.15 at 50 MHz
Power range: –30 dBm to +20 dBm
SWR: ≤1.20 at 1 GHz
E8257D
E8361A/E8361C/E8363B/E8363C
8990B
11667A
N1912A
N8481A/N8487A
N1921A/N1922A
Cable adapter 11730A sensor cable adapter N1911A-200
N-type-to-SMA adapter N-type (m) to 2.4 mm SMA (f) 11903D
Trigger cable
BNC (m) to SMB (f)
Characteristic impedance: 50 Ω
U2032A
6 N1923/4A Service Guide
Performance Verification and Adjustments 2
Voltage Standing Wave Ratio (VSWR) Performance Verification
VSWR is a measure of how efficiently an RF power is transmitted from an
RF power source. In real systems, mismatched impedances between the RF
source and load can cause some of the power to be reflected back towards
the source and vary the VSWR.
This test requires the following equipment:
• network analyzer (E8361A/C or E8363B/C)
• calibration kit (85054A/D, 85056A/D)
Tes t p ro c ed u re
1 Turn on the network analyzer and allow it to warm up for
approximately an hour.
2 Set the start frequency of the network analyzer to 50 MHz and stop
frequency to 18 GHz (for the N1923A) and 40 GHz (for the N1924A).
3 Calibrate the network analyzer using the appropriate calibration kit
(85054A/D for the N1923A and 85056A/D for the N1924A). Perform
calibration for the open, short, and load circuits of the network
analyzer.
4 After calibration, connect the N1923/4A to the test port of the network
analyzer. Turn on Correction on the network analyzer to perform the
VSWR measurement.
5 Compare the measured results to the specifications in the table below.
If the verification fails, refer to “Adjustments” on page 17.
Sensor model Frequency band Maximum SWR
N1923A 50 MHz to 10 GHz 1.2
10 GHz to 18 GHz 1.26
N1924A 50 MHz to 10 GHz 1.2
10 GHz to 18 GHz 1.26
18 GHz to 26.5 GHz 1.3
26.5 GHz to 40 GHz 1.5
N1923/4A Service Guide 7
2 Performance Verification and Adjustments
Signal source
Power splitter
Incident sensor
Standard sensor
A
B
Power meter
Sensor Accuracy Performance Verification
The purpose of this verification is to verify the accuracy of the N1923/4A
after a period of usage to ensure that the N1923/4A is still within its
published specifications.
This test requires the following equipment:
• PSG analog signal generator (E8257D)
• power sensor (N1921/2A, N8481/7A)
• power meter (N1912A, N1911A- 200)
• power splitter (11667A)
Tes t p ro c ed u re
1 Turn on the E8257D and N1912A. Allow them to warm up for
approximately an hour.
2 Connect the standard sensor (N8481/7A) to the N1912A channel A and
the incident sensor (N1921/2A) to the N1912A channel B.
3 The equipment setup is as shown below:
8 N1923/4A Service Guide
4 Zero and calibrate the standard and incident sensors on channels A
and B respectively.
Performance Verification and Adjustments 2
Signal source
Power splitter
Incident sensor
DUT
A
B
Power meter
5 Set the frequency of the signal source to 50 MHz and power level to
0 dBm. Turn on the RF output.
6 Set the frequency of the N1912A channels A and B to the same
frequency as the signal source.
7 Measure the standard power (P
(P
) of channel B. Compute and record the power ratio (P
INC1
) of channel A and incident power
STD
ratio
) of
these channels for the current frequency and power level, based on the
following equation:
P
ratio
(dB) = P
STD
– P
INC1
8 Repeat steps 5 to 7 for other frequencies with the same power level.
9 Turn off the RF output of the signal source.
10 Remove the standard sensor from the N1912A channel A.
11 Connect the device- under- test (DUT, N1923/4A) to the N1912A
channel A.
12 The equipment setup is as shown below:
N1923/4A Service Guide 9
13 Zero and calibrate the DUT on the N1912A channel A.
14 Repeat steps 5 and 6.
15 Measure and record the power readings of channels A and B for the
current frequency and power level, as P
(for channel B).
(for channel A) and P
DUT
INC2
2 Performance Verification and Adjustments
NOTE
Anti
P
DUTPINC2
P
STDPINC1
–()+()–
10
---------------------------------------------------------------- 1–log 100×
Accuracy error (%) =
16 Repeat steps 14 and 15 for other frequencies with the same power level.
17 Turn off the RF output of the signal source.
18 Compute the accuracy error of the DUT for each frequency being
measured at the same power level, using the following equations:
Accuracy error (dB) = P
DUT
– (P
INC2
+ (P
STD
– P
INC1
))
19 Compare the computed accuracy errors to the calibration uncertainty
values in the table below. If the verification fails, refer to
“Adjustments” on page 17.
The accuracy error measured in this verification includes a
combination of errors for linearity, calibration factor, and temperature
compensation.
Sensor model Frequency band Calibration uncertainty
N1923A 50 MHz to 500 MHz 4.5%
500 MHz to 1 GHz 4.0%
1 GHz to 10 GHz 4.0%
10 GHz to 18 GHz 5.0%
N1924A 50 MHz to 500 MHz 4.3%
500 MHz to 1 GHz 4.2%
[1]
10 N1923/4A Service Guide
1 GHz to 10 GHz 4.4%
10 GHz to 18 GHz 4.7%
18 GHz to 26.5 GHz 5.9%
26.5 GHz to 40 GHz 6.0%
[1] Beyond 70% humidity, an additional 0.6% must be added to the values.
20 Repeat steps 5 to 19 by sweeping through the power level from
–25 dBm to 10 dBm with a frequency of 50 MHz.
Performance Verification and Adjustments 2
System-Level Rise and Fall Time Performance Verification
The rise and fall time performance of the instrument path must be
quantified accurately. This test however, is more of a system- level
verification, validating the rise and fall time with the 8990B peak power
analyzer using an actual RF pulse.
This test requires the following equipment:
• PSG analog signal generator (E8257D)
• Peak power analyzer (8990B)
• Diode detector (33334EZ)
• Oscilloscope (Infiniium MSO 9104A)
• Trigger cable (U2032A)
• Sensor (N1923/4A, as DUT)
System specifications:
• Rise/fall time: <5 nsecs ± % error (Refer to Figure 3- 3 on page 21)
• Overshoot: 0.5%
Tes t p ro c ed u re
1 Turn on the E8257D, oscilloscope, and 8990B.
2 Allow the system to warm up for approximately an hour before starting
the measurement.
3 Generate an RF pulse signal (with the following recommended signal
profile) from the E8257D.
• Frequency: 1 GHz
• Power level: 10 dBm
• Pulse period: 10 μsecs
• Duty cycle: 50%
The pulse signal is characterized using a diode detector which feeds to
the oscilloscope. This is to verify that the rise/fall time of the RF pulse
measured by the oscilloscope is <5 nsecs and its overshoot is <0.5%.
N1923/4A Service Guide 11
2 Performance Verification and Adjustments
E8257D
8990B
N1923/4A
Figure 2-1 Screenshot of the oscilloscope measurement display
4 Connect the N1923/4A to the E8257D and 8990B as shown below:
5 Generate the same pulse signal as previous.
6 Press Auto Scale on the 8990B to scale the pulse signal to the optimum
display.
12 N1923/4A Service Guide
Performance Verification and Adjustments 2
7 Turn off Video Bandwidth on the 8990B.
8 Measure and record the rise/fall time of the pulse signal from the
8990B in the table below.
Measured points Specification Measured
rise time (sec)
Bandwidth: OFF, Power level: 10 dBm, Pulse period: 0.2 μsecs,
Duty cycle: 50%
Bandwidth: OFF, Power level: 10 dBm, Pulse period: 1 μsec,
Duty cycle: 50%
Bandwidth: OFF, Power level: 10 dBm, Pulse period: 10 μsecs,
Duty cycle: 50%
Bandwidth: OFF, Power level: 10 dBm, Pulse period: 100 μsecs,
Duty cycle: 50%
Bandwidth: LOW, Power level: 10 dBm, Pulse period: 0.2 μsecs,
Duty cycle: 50%
Bandwidth: LOW, Power level: 10 dBm, Pulse period: 1 μsec,
Duty cycle: 50%
Bandwidth: LOW, Power level: 10 dBm, Pulse period: 10 μsecs,
Duty cycle: 50%
Bandwidth: LOW, Power level: 10 dBm, Pulse period: 100 μsecs,
Duty cycle: 50%
Bandwidth: MED, Power level: 10 dBm, Pulse period: 0.2 μsecs,
Duty cycle: 50%
5n
5n
5n
5n
60n
60n
60n
60n
25n
Pass/fail
Bandwidth: MED, Power level: 10 dBm, Pulse period: 1 μsec,
Duty cycle: 50%
Bandwidth: MED, Power level: 10 dBm, Pulse period: 10 μsecs,
Duty cycle: 50%
Bandwidth: MED, Power level: 10 dBm, Pulse period: 100 μsecs,
Duty cycle: 50%
Bandwidth: HIGH, Power level: 10 dBm, Pulse period: 0.2 μsecs,
Duty cycle: 50%
25n
25n
25n
13n
N1923/4A Service Guide 13
2 Performance Verification and Adjustments
Measured points Specification Measured
rise time (sec)
Bandwidth: HIGH, Power level: 10 dBm, Pulse period: 1 μsec,
Duty cycle: 50%
Bandwidth: HIGH, Power level: 10 dBm, Pulse period: 10 μsecs,
Duty cycle: 50%
Bandwidth: HIGH, Power level: 10 dBm, Pulse period: 100 μsecs,
Duty cycle: 50%
13n
13n
13n
9 Repeat the above steps for the pulse signal with different pulse periods
and different video bandwidth settings. Record all the readings in the
above table.
10 Compare the recorded readings to the specifications in the table. If the
verification fails, refer to “Adjustments” on page 17.
Pass/fail
14 N1923/4A Service Guide
Zero Set Performance Verification
N1923/4A
8990B
Zero set is defined as the amount of residual offset error that is present
following a zeroing operation. This offset error is caused by contamination
from several sources, including circuit noise. This test is a system- level
verification which requires an 8990B.
This test requires the following equipment:
• Peak power analyzer (8990B)
• Sensor (N1923/4A, as DUT)
System specification: <200 nsecs
Tes t p ro c ed u re
1 Turn on the 8990B.
2 Connect the N1923/4A to the 8990B as shown below. Allow the system
to warm up for approximately an hour.
Performance Verification and Adjustments 2
3 Set the channel 1 frequency to 50 MHz.
4 Perform zeroing and calibration for N1923/4A.
5 Set the horizontal scale of the display to the Linear scale.
6 Measure the average power.
7 Collect each mean value of the power reading for 1 minute.
N1923/4A Service Guide 15
2 Performance Verification and Adjustments
8 Calculate the mean of the collected data for the total number of
readings in 1 minute.
9 Calculate the standard deviation (σ) of the data.
10 The zero set is computed using the following equation:
Zero set = mean + k*
11 Repeat the above steps for channel 4.
12 If the calculated zero set value is out of specification (>200 nsecs), refer
to “Adjustments” on page 17.
σ
, where k = 2 due to 95% confidence level
16 N1923/4A Service Guide
Adjustments
Performance Verification and Adjustments 2
Adjustments are usually required on a yearly basis. They are normally
performed only after a performance verification has indicated that some
parameters are out of specification. Performance verification must be
completed after any repairs that may have altered the characteristics of
the N1923/4A.
The N1923/4A is required to be returned to Agilent for adjustments. To
arrange this, contact the Agilent Service Center. Refer to “Contacting
Agilent” on page 29 or Contact us on the last page of this guide for
information.
N1923/4A Service Guide 17
2 Performance Verification and Adjustments
18 N1923/4A Service Guide
Agilent N1923/4A Wideband Power Sensor
Service Guide
3 Theory of Operation
Theory of Operation 20
This chapter describes the operation and functions of the N1923/4A
assembly.
Agilent Technologies
19
3 Introduction
Theory of Operation
The N1923/4A is integrated with the internal zeroing and calibration
capability, which eliminates the need for sensor calibration using an
external reference source.
Agilent's patented technology (see Figure 3-2) integrates a DC reference
source and switching circuits into each N1923/4A, so that you can zero
and calibrate the N1923/4A while it is connected to a device- under- test.
This feature removes the need for connection and disconnection from the
calibration source, thereby reducing test times, measurement uncertainty,
and wear and tear on connectors. It is especially useful in manufacturing
and automated test environments where every second and every
connection counts. The N1923/4A can be embedded within test fixtures
without the need to switch in reference signals.
Figure 3-2 Internal zeroing and calibration block diagram
To ensure the accuracy of power measurements and improve measurement
speed, the N1923/4A uses a four- dimensional (4- D) modeling technique
that measures input power, frequency, temperature, and output voltage
across the N1923/4A specified measurement ranges. Data from this 4- D
model is generated during Agilent's initial factory calibration of the
N1923/4A and stored in EEPROM.
20 N1923/4A Service Guide
Introduction 3
SignalUnderTestRiseTime()
2
SystemRiseTime()
2
+()
MeasuredRiseTime SignalUnderTestRiseTime–()
SignalUnderTestRiseTime()
------------------------- ---------------------------- ------------------------------- ------------------------------- --------------------
100×
All the compensation data is downloaded to the power meter/peak power
analyzer at power- on or when the N1923/4A is connected. Advanced
algorithms are used to quickly and accurately evaluate the N1923/4A
against this model, without requiring the power meter/peak power
analyzer to interpolate the calibration factors and linearity curves. If you
run tests in which the frequency changes often, such as testing
multi- carrier amplifiers on different bands, you will notice a marked
improvement in measurement speed.
Figure 3-3 Measured rise time percentage error versus signal-under-test rise time
Although the rise time specification is ≤5 nsecs, this does not mean that
the combination of peak power meter, peak power analyzer, and N1923/4A
can accurately measure a signal with a known rise time of 5 nsecs. The
measured rise time is the root sum of the squares (RSS) of the
signal- under- test rise time and the system rise time (5 nsecs):
The % error is:
N1923/4A Service Guide 21
3 Introduction
22 N1923/4A Service Guide
Agilent N1923/4A Wideband Power Sensor
Service Guide
4 Repair Guide
Repair 24
Replaceable Parts 25
Disassembly/Reassembly Procedure 27
Disassembly procedure 27
Reassembly procedure 27
This chapter contains information on repair and replaceable parts of the
N1923/4A. This chapter also explains how to assemble and disassemble
the N1923/4A.
Agilent Technologies
23
4Repair Guide
Repair
There are no serviceable parts inside the N1923/4A. If the N1923/4A is
defective, send it back to the nearest Agilent Service Center for repair.
The entire “module” of the defective N1923/4A will be replaced with an
appropriate replacement module listed in Table 4- 1.
24 N1923/4A Service Guide
Replaceable Parts
NOTE
MP2
MP1
MP3
MP5
MP1
A1
MP4
Replaceable parts are only available for the use of Agilent Service Center personnel and are
not available for trade sales.
The following figure illustrates the parts breakdown of the N1923/4A
which identifies all the replaceable parts. If you want to order a part,
quote the Agilent part number, specify the quantity required, and address
the order to the nearest Agilent Sales and Service office.
Repair Guide 4
N1923/4A Service Guide 25
Figure 4-1 Illustrated parts breakdown
4Repair Guide
Tab l e 4 - 1 Replaceable parts list for the N1923/4A
Reference
designation
A1
N1923A N1923A-105 N1923-60001 1
N1923A N1923A-106 N1923-60002 1
N1923A N1923A-107 N1923-60003 1
N1924A N1924A-105 N1924-60001 1
N1924A N1924A-106 N1924-60002 1
N1924A N1924A-107 N1924-60003 1
Chassis part
MP1 – N1920-20001 2 Plastic housing/shield
MP2 – N1923-84301 1 Top label (N1923A)
MP2 – N1924-84302 1 Top label (N1924A)
MP3 – 5188-3998 1 Side label
MP4 – N1920-80002 1 Bottom label
MP5 – N1920-80004 1 Side ESD label
Option Part number Quantity Description
N1923A replacement module,
fixed 1.5 m (5 ft) cable
N1923A replacement module,
fixed 3.0 m (10 ft) cable
N1923A replacement module,
fixed 10.0 m (31 ft) cable
N1924A replacement module,
fixed 1.5 m (5 ft) cable
N1924A replacement module,
fixed 3.0 m (10 ft) cable
N1924A replacement module,
fixed 10.0 m (31 ft) cable
26 N1923/4A Service Guide
Disassembly/Reassembly Procedure
CAUTION
Disassemble the N1923/4A only in a static-free workstation. Electrostatic discharge
renders the N1923/4A inoperative.
Disassembly procedure
Use the following steps to disassemble the N1923/4A:
• At the rear of the N1923/4A, insert the blade of a screwdriver between
the plastic shells (refer to Figure 4- 2). To prevent damage to the plastic
shells, use a screwdriver blade as wide as the slot between the two
shells.
• Pry alternately at both sides of the connector until the plastic shells are
apart. Remove the shells and the magnetic shields.
Repair Guide 4
N1923/4A Service Guide 27
Figure 4-2 Removing the N1923/4A shell
Reassembly procedure
Replace the magnetic shields and the plastic shells. Snap the plastic shells
together.
4Repair Guide
28 N1923/4A Service Guide
Agilent N1923/4A Wideband Power Sensor
Service Guide
5 Contacting Agilent
Introduction 30
Instrument serial numbers 30
Recommended calibration interval 31
Returning the N1923/4A for Service 32
Packaging the N1923/4A for shipment 32
This chapter explains the appropriate actions to take if you have a
problem with your N1923/4A.
Agilent Technologies
29
5 Introduction
Introduction
Instrument serial numbers
This section provides the information on what to do if you encounter
problems with your N1923/4A.
If you wish to contact Agilent to enquire about the N1923/4A, from
service problems to ordering information, refer to Contact us on the last
page of this guide.
If you wish to return the N1923/4A to Agilent, refer to “Returning the
N1923/4A for Service” on page 32.
Agilent makes frequent improvements to its products to enhance their
performance, usability, and reliability. Agilent service personnel have
access to complete records of design changes for each instrument. The
information is based on the serial number and option designation of each
N1923/4A.
Whenever you contact Agilent about your N1923/4A, have a complete
serial number available. This ensures you obtain the most complete and
accurate service information. The serial number can be obtained from the
serial number label.
The serial number label is attached to the side panel of the N1923/4A.
This label has two instrument identification entries. The first provides the
instrument serial number and the second provides the identification
number for each option built into the instrument.
The serial number is divided into two parts: the prefix (two letters and
the first four numbers), and the suffix (the last four numbers).
• The prefix letters indicate the country of manufacture. This code is
based on the ISO international country code standard, and is used to
designate the specific country of manufacture for the individual
product. The same product number could be manufactured in two
different countries. In this case, the individual product serial numbers
would reflect different country of manufacture codes. The prefix also
consists of four numbers. This is a code identifying the date of the last
major design change.
30 N1923/4A Service Guide
Introduction 5
SERIAL NUMBER
SER
MY12345678
OPT
Agilent
MADE IN MALAYSIA
• The suffix indicates an alphanumeric code which is used to ensure
unique identification of each product throughout Agilent.
Figure 5-3 Serial number
Recommended calibration interval
Agilent recommends a one- year calibration cycle for the N1923/4A.
N1923/4A Service Guide 31
5 Introduction
CAUTION
Returning the N1923/4A for Service
Use the information in this section if you need to return your N1923/4A
to Agilent.
Packaging the N1923/4A for shipment
Use the following procedure to package the N1923/4A for shipment to
Agilent for servicing:
• Be as specific as possible about the nature of the problem. Send a copy
of any information on the performance of the N1923/4A.
Damage to the instrument can result from using packaging material other than those
specified. Never use styrene pellets in any shape as packaging material. They do not
adequately cushion the instrument or prevent it from shifting in the carton. Styrene
pellets cause instrument damage by generating static electricity and by lodging in the
instrument panels.
32 N1923/4A Service Guide
• Use the original packaging material or a strong shipping container made
of double- walled, corrugated cardboard with 91 kg (200 lb.) bursting
strength. The carton must be large and strong enough to accommodate
the N1923/4A and allow at least 3 to 4 inches on all sides of the
N1923/4A for packing material.
• Surround the N1923/4A with at least 3 to 4 inches of packing material,
or enough to prevent the N1923/4A from moving in the carton. If
packing foam is not available, the best alternative is SD- 240 Air Cap
from Sealed Air Corporation (Commerce, CA 90001). Air Cap looks like
a plastic sheet covered with 1- 1/4-inch air filled bubbles. Use the pink
Air Cap to reduce static electricity. Wrap the N1923/4A several times in
the material as protection and to prevent it from moving in the carton.
• Seal the shipping container securely with strong nylon adhesive tape.
• Mark the shipping container as “FRAGILE, HANDLE WITH CARE” to
ensure careful handling.
• Retain copies of all shipping papers.
TM
www.agilent.com
Contact us
To obtain service, warranty, or technical assistance, contact us at the following phone or fax
numbers:
United States:
(tel) (800) 829 4444 (fax) 800 829 4433
Canada:
(tel) (877) 894 4414 (fax) 800 746 4866
China:
(tel) 800 810 0189 (fax) 800 820 2816
Europe:
(tel) 31 20 547 2111
Japan:
(tel) 0120 (421) 345 (fax) 0120 421 678
Korea:
(tel) 080 769 0800 (fax) (080) 769 0900
Latin America:
(tel) 305 269 7500
Ta i w a n :
(tel) 0800 047 866 (fax) 0800 286 331
Other Asia Pacific Countries:
(tel) (65) 6375 8100 (fax) (65) 6755 0042
Or visit Agilent World Wide Web at:
www.agilent.com/find/assist
Product specifications and descriptions in this
document are subject to change without notice.
Always refer to the Agilent Web site for the latest
revision.
© Agilent Technologies, Inc. 2011
First Edition, Oct 31, 2011
N1923-90003
Agilent Technologies
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