Agilent 8470B Operations Guide

Agilent Technologies
423B and 8470B Detectors

Operating and Service
Manual

Part number: 00423-90103
Printed in USA
October 2003

Supersedes October 2002

Notice

The information contained in this document is subject to change without
notice.

Agilent Technologies makes no warranty of any kind with regard to this
material, including, but not limited to, the implied warranties of
merchantability and fitness for a particular purpose. Agilent Technologies
shall not be liable for errors contained herein or for incidental or
consequential damages in connection with the furnishing, performance, or
use of this material.

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its softwa re on equipment that is not furnished by Agilent Technologies.

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Restricted Rights Legend

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Data and Computer Software clause at DFARS 252.227-7013 for DOD
agencies, and subparagraphs (c)(1) and (c)(2) of the Commercial Computer
Software Restricted Rights clause at FAR 52.227-19 for other agencies.

Agilent Technologies
1400 Fountaingrove Parkway
Santa Rosa, CA 95403-1799, U.S.A.

© Copyright 1975, 1977, 1979, 2001-2003 Agilent Technologies, Inc.

ii Agilent 423B and 8470B Detectors

Warranty

Certification Agilent Technologies certifies that this product met its published

specifications at the time of shipment from the factory. Agilent Technologies
further certifies that its calibration measurements are traceable to the
United States National Institute of Standards and Technology (NIST,
formerly NBS), to the ext ent allowed by the Institute’s calibration facili ty,
and to the calibration facilities of other International Standards
Organization members.

Documentation 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 CONTAINED HEREIN, INCLUDING BUT NOT
LIMITED TO THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. AGILENT SHALL NOT BE LIABLE FOR ERRORS
OR FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES IN
CONNECTION WITH THE FURNISHING, USE, OR
PERFORMANCE OF THIS DOCUMENT OR ANY
INFORMATION CONTAINED HEREIN. SHOULD AGILENT
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
WILL CONTROL.

Assistance Product maintenance agreements and other customer assistance agreements

are available for Agilent Technologies products.
For assistance, call your local Agilent Technologies Sales and Service

Office.
Any adjustment, maintenance, or repair of this product must be performed

by qualified personnel. Contact your customer engineer through your local
Agilent Sales and Service Center.

Agilent 423B and 8470B Detectors iii

By internet, phone, or fax, get assistance with all your test & measurement needs.

Online assistance: www.agilent.com/find/assist

United States

(tel) 1 800 452 4844

Canada

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(fax) [phone]

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iv Agilent 423B and 8470B Detectors

Safety and Regulatory Information

Review this product and related documentation to familiarize yourself with
safety markings and instructions before you operate the instrument. This
product has been designed and tested in accordance with international
standards.

WARNING The WARNING notice denotes a hazard. It calls attention to a procedure,

practice, or the like, that, if not correctly performed or adhered to, could result
in personal injury. Do not proceed beyond a WARNING notice until the
indicated conditions are fully understood and met.

CAUTION The CAUTION notice denotes a hazard. It calls attention to an operating

procedure, practice, or th e like, whic h, if not cor rect ly 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.

Instrument Markings

When you see this symbol on your instrument, you should refer to the instrument’s

!

1SM1-A This text indicates that the instrument is an Industrial Scientific and Medical Group

ICES/NMB-001 This ISM device complies with Canadian ICES-001. Cet appareil ISM est

instruction manual for important information.

This symbol indicates hazardous voltages.

The laser radiation symbol is marked on products that have a laser output.

This symbol indicates that the instrument requires alternating current (ac) input.

The CE mark is a registered trademark of the European Community. If it is
accompanied by a year, it indicates the year the design was proven.

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

1 Class A product (CISPER 11, Clause 4).

conforme a la norme NMB-001 du Canada.
This symbol indicates that the power line switch is ON.

This symbol indicates that the power line switch is OFF or in STANDBY position.

Agilent 423B and 8470B Detectors v

Contents

Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii

Restricted Rights Legend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii

Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii

Documentation Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii

Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii

Safety and Regulatory Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Initial Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Storage and Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Operating Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Operator’s Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Performance Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Frequency Response Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Higher Level Sensitivity Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Low Level Sensitivity Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Match Test (SWR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Service Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Replaceable Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Detector Element Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Load Resistor Parts Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

7-mm Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Agilent 423 and 8470B Detectors vi

Description

Description

The Agilent Technologies 423B and 8470B detectors are 50 Ω (nominal)
Schottky diode devices designed for measurement use in coaxial systems.

Features • The instruments convert the RF power levels applied to the 50 Ω input

connector into proportional values of dc voltage.

• The instruments measure re la ti ve power up to 200 mW and have a BNC

female connector for the ou tput j ack whi ch all ows the detec ted out put t o

be connected to a SWR meter.

• The output voltage polarity is negative, unless Option 003 is selected.

• The frequency range of the 423B is 10 MHz to 12.4 GHz.

• The frequency range of the 8470B is 10 MHz to 18 GHz.

• AM modulation can be detected up to about 1 MHz.

Options The 423B and 8470B detectors are available with the following

non-exclusive options.

Option 001: Matched pair of detectors

Option 002: Furnished with matched load resistor for optimum

square law characteristics
Option 003: Positive polarity output
Option 012: Furnished with stainless steel type-N male

connectors (8470B only)

Connectors • The mating RF input connectors used with the 423B and 8470B

Option 012 must be type-N female connectors which comply with
U.S. military standard MIL-C-39012.

• The 8470B (standard) RF input connector must be an 7-mm connector.

• The mating output connector for the 423B and 8470B must be a BNC

male.

Agilent 423B and 8470B Detectors 1

Installation

Installation

Initial Inspection 1. Inspect the shipping container for damage. If the shipping container or

cushioning material is damaged, it should be kept until the contents of
the shipment have been checked for completeness and the instrument
has been checked mechanically and electrically. Procedures for
checking electri cal performa nce are given under “Performanc e T e sts” on

page 6.

2. If the contents are incomplete, if there is mechanical damage or defect,
or if the instru ment does not pas s the e lectr ical perf ormance test , co ntact
the nearest Agilent Technologies office. Any adjustment, maintenance,
or repair of this product must be performed by qualified personnel.
Contact your customer engineer through your local Agilent Sales and
Service Center. Refer to “Assistance” on page iii. Agilent T echnologies
will arrange for repair or replacement of the damaged or defective
equipment. Keep the shipping materials for the carrier’s inspection.

3. If you are returning the instrument for service, r epackaging the
instrument requires original shipping containers and materials or their
equivalents. Agilent can provide packaging materials identical to the
original materials. Any adjustment, maintenance, or repair of this
product must be performed by qualified personnel. Contact your
customer engineer through your local Agilent Sales and Service Center.
Refer to “Assistance” on page iii. Attach a tag indicating the type of
service required , ret urn add ress, m odel numbe r and se ri al numb er. Mark
the container FRAGILE to insure careful handling. In any
correspondence, refer to the instrument by model number and serial
number.

Storage and Shipment The instrument should be stored in a clean, dry environment. The following

environmental limitations apply to both storage and shipment:

a. Temperature: −54 to +85 °C
b. Altitude < 7620 meters (25,000 feet)
c. Humidity < 95% relative
d. Shock 100 G for 11 ms
e. Vibration 20 G from 80 to 2000 Hz

2 Agilent 423B and 8470B Detectors

Specifications

Frequency Range: Options:

Installation

423B: 10 MHz to 12.4 GHz
8470B: 10 MHz to 18 GHz

Note: RF may leak through the output connector below 1 GHz. It can

be reduced, if objectionable, with a suitable low pass filter.

Frequency Response:

423B and 8470B:

Octave flatness:

4, 5

±0.2 dB over any octave 10 MHz to 8 GHz

Broadband flatness:

±0.3 dB 10 MHz to 12.4 GHz

8470B only:

Broadband flatness:

±0.5 dB 10 MHz to 15 GHz
±0.6 dB 10 MHz to 18 GHz

1,2

(Max):

SWR

423B and 8470B:

10 MHz to 4 GHz, 1.15
4 GHz to 12.4 GHz, 1.3

8470B only:

12.4 GHz to 15 GHz, 1.3

15.0 GHz to 18 GHz, 1.7

Maximum Operating Input Power:

200 mW, peak or average

Maximum Short Term Input Power:

1 watt (typical) peak or average for < 1 minute

Sensitivity:

Input Impeda nce: 50 Ω (nominal)

Output Impedance: 1 to 2 k Ω (typically 1.3 k Ω) shunted by

Output Po l ari ty: Negative (refer to options for positive polarity units)

Detector Element: Supplied (refer to “Replacement Parts Table” on

page 12 for replacement elements)

1, 3, 5

High level: < 0.35 mW produces 100 mV output
Low level: > 0.5 mVdc/µW CW

35 to 65 pF (typically 50 pF).

423B and 8470B:

Option 002: Furnished with matched load resistor for optimum

square law characteristics of 25
law over a range of at least 30 dB up to 10 mV peak output,
working into an external load > 8 k Ω. Sensitivity typically is
greater than 0.1 mV/

Option 003: Positive polarity output

423B:
Option 001: Matched detector pair. Frequency response

characteristics (exclusive of basic sensitivity) track within

µW when load resistor is used.

°C, within ±0.5 dB from square

±0.2 dB from 10 MHz to 12.4 GHz at −30 dBm.

8470B:
Option 001: Matched detector pair. Frequency response

characteristics (exclusive of basic sensitivity) track within

±0.2 dB from 10 MHz to 12.5 GHz;
±0.3 dB from 12.4 GHz to 18 GHz at −30 dBm.

Option 012: Furnished with stainless steel type-N male connector.

Environmental:

423B:

Operating temperature: 0
Humidity: < 95% relative
Vibration: 20 G from 80 to 2000 Hz
Shock: 100 G for 11 ms
Altitude: < 4570 meters (15,000 feet)

8470B:

Operating temperature:
Humidity: < 95% relative
Vibration: 20 G from 80 to 2000 Hz
Shock: 100 G for 11 ms
Altitude: < 4570 meters (15,000 feet)

General:

Weight:
423B and 8470B: Net 114 g (4 oz.)
Dimensions:
423B: 63 mm long, 20 mm diameter (2.47 in. long,

0.78 in. diameter)

8470B: 64 mm long, 19mm diameter (2.50 in. long,

0.75 in.diameter)

C to +55 °C

−20 to +85 °C

Bias: Not required

Noise: < 50 µVpp with

1. Specifications given for +25 °C unless otherwise noted.

2. Measurement made at

3. Sensitivity decreases with increasing temperature, typically: 0.5 dB from
1 dB from +40 to +55 °C; 1.25 dB from +55 to +75 °C; 1 dB from +75 to +85 °C;

4. Measured at

5. External load resistance > 50 k Ω

CW applied to produce 100 mV output

−20 dBm.

−30 dBm. Flatness is the peak-to-valley range of the response.

Agilent 423B and 8470B Detectors 3

−20 to +25 °C; 0.5 dB from +25 to +40 °C;

Operating Information

Operating Information

The detector can be used as a demo dula to r to obtai n a pul se envelope which
can then be observed on an oscilloscope. It can also be used as a general
purpose detector.

CAUTION

Static discharge can damage the detector element. A 100 pF capacitor
(1.2 m [4 ft] of coax cable) charged to 14 volts stores .1 erg, the maximum
pulse rating of the detector element.

• Connect cables to test equipment and discharge the center conductor

before connecting to the detector.

• DO NOT NEEDLESSLY HANDLE THE DETECTOR ELEMENT

USED IN CR YSTAL DETECTOR. Static e lectr icity wh ich builds u p o n
a person, especially on a cold dry day, must never be allowed to
discharge through the detector.

• Avoid exposed leads to or from the detector, since these are often

touched accidentally.

The power applied to the detector can be either modulated or continuous
wave (CW). If modulated at a 1 000 Hz rate, an SWR meter can be used as an
indicator. For CW detection, a dc milliammeter or millivoltmeter can be
used as the indicator.

NOTE When using the detector with an oscilloscope, and the waveshapes to be

observed have rise times of less than 5
oscilloscope and detector should be as short as possible and shunted with a
resistor.

Ideally, this resistor should be 50
However, with 50
drive some oscilloscopes. Therefore, the cable should be shunted with the
smallest value of resistance that will obtain suitable deflection on the
oscilloscope; typically the value will lie between 50
the resistance the more degradation of rise time.

4 Agilent 423B and 8470B Detectors

Ω resistance, the output video pulse may be too small to

µs, the coaxial cable connecting

Ω to terminate the coaxial cable properly.

Ω and 2kΩ. The larger

Operator’s Check Peak Power Measurement

The procedure for peak power measurement involves calibration of an
oscilloscope which, in turn, is used to calibrate a CW generator. The output
of the calib rated CW gene rator is measured with a pow er meter; the peak
power of a pulse is thereby measured. The procedure is as follows:

1. Connect equipment as shown in Figure 1, step A. Observe th e pulse on a
de-coupled oscilloscope. Using a marking pencil, mark on the graticule
the base-to-peak amplitude of the pulse envelope.

2. Replace the pulse source with a CW generator. While observing the
oscilloscope trac e, a djust the amplit ude of CW gen erato r outp ut to make
detector’s output equal to that of pulse generator, as indicated by
markings on the graticule (step A).

3. Leave the CW generator at setting obtained in step B. Disconnect the
detector from CW generator.

4. Connect the output of CW generator to the powe r meter (step C).
Measure the adjusted levels (set in step B) of the CW generator output.
The peak power of the pulse envelope observed in step A is equal to the
output power of the CW generator.

Operating Information

Figure 1 Peak Power Measurement

Reflectome ter Application

For information about reflectometer systems and measurements refer to
Agilent Technologies Application Note Index. Copies are available upon
request.

Harmony Frequency Comparison Measurement Application

The detector can be used as a mixer in harmonic-frequency comparison
measurements. Refer to Agilent Technologies Application Note Index for
further information.

Agilent 423B and 8470B Detectors 5

Performance Tests

Performance Tests

Methods for testing detector specifications are given below. Refer to the
manuals of the equipment involved for operating instructions.

NOTE Multiple mismatch errors caused by attenuator SWR, p ower meter SWR,

and detector SWR should be taken into account, as well as the accuracy of
the indicator used to measure the detector’s output.

Frequency Response Test

Higher Level Sensitivity Test

1. Using signal sources covering 10 MHz to 18 GHz with a 10 dB isol ating
attenuator and a po wer meter , conn ect the power s ensor to the att enuator.
Adjust the R F power level to −20 dBm input to the power sensor.

2. Without changing the RF power level of signal source, disconnect the
power sensor.

3. Connect the detector to the attenuator. Measure the dc voltage output
and record the measurement.

4. Change the frequency of the signal source and repeat steps 1 through 3.

5. Since the detector follows a square-law response at this power level, its
output is proportional to power (P
detector readings should meet specifications for all frequencies of
interest across the band.

1. Using signal sources covering 10 MHz to18 GHz and a dc voltmeter or
oscilloscope as the indicator, connect the detector to the signal source.
Adjust the RF power level for a 100 mV detected output from the
detector, using a CW signal.

2. Disconnect the detector from the signal source and measure the RF
output level. The RF output level should be

= 10 log Vo). Total variation of

dB

≤ 0.35 mW.

3. Repeat steps 1 and 2 for all frequencies of interest across the band.

Low Level Sensitivity Test

1. Using a signal source (cover ing 10 MHz t o 18 GHz) , a 10 dB att enuator,
and a power meter, connect the attenuator to the signal s ource and power
sensor to the attenuator. Adjust the RF power level for −20 dBm output
from the attenuator. Verify the ambient temperature .

2. Disconnect the power sensor from the attenuator and connect the
detector. Measure the dc voltage output from the detector. The output
should be > 5.0 mV at 25× °C. Between 20× °C and 30× °C, the sensitivity
slope is typically −0.04 dB/× °C.

Match Test (SWR) 1. To verify the detector’s SWR specifications, use any system whose

measurement accuracies for SWR (residual SWR) are known.

6 Agilent 423B and 8470B Detectors

Service Instructions

Service Instructions

Repair and replacement information for the 423B and 8470B detectors and
Option 002 load resistor are given below. Any adjustment, maintenance, or
repair of this product must be performed by qualified personnel. Contact
your customer engineer through your local Agile nt Sales and Servic e Center .
You can find a list of Agilent Sales and Service Centers on page iv. The
detectors have no internal adjustments.

Replaceable Parts Part numbers for replaceable parts are given in “Replacement Parts Table”

on page 12. T o o rder a rep lacement p art, addr ess your order o r inquiry t o the

nearest Agilent Technologies offi ce. Any a djustme nt, mainten ance, o r repa ir
of this product must be performed by qualified personnel. Contact your
customer engineer through your local Agilent Sales and Service Center.
Refer to “Assistance” on page iii. Include the model number, Agilent
Technologies part number, and a description.

Detector Element Replacement

CAUTION

The detector element assembly includes only a detector element. However,
Option 002 does include a resistor for the load resistor which is used to load
the diode for square-law operation.

Read the following precautions carefully before performance of any
operation with the dete ctor el ement when i t is o ut of ei ther t he housin g or the
detector element shipping container.

• Before installing the diode into the mount, touch the exposed metal on

the mount with your hand to discharge static electricity.

• When handing the diode to another person, first touch hands to ensure

that there is no difference in static electricity potential between you.

• Ohmmeters should not be used to measure forward- and bac k-res ista nce

since it is easy to damage these diodes. The ohmmeter’s open-circuit
voltages and short-circuit currents may cause problems.

1. Remove the female BNC connector and compression spr ing from insi de
of the connector cap.

2. Remove the connector cap from the body. Use a pair of pliers with
plastic jaws or protect the body with heavy paper or tape.

Agilent 423B and 8470B Detectors 7

Service Instructions

CAUTION

• Do not rotate the detector element while inserting or removing as

damage may result.

• When inserting the detector element, do not force the large pin end into

the center conductor.

• The detector element might be damaged if the detector element is not

centered.

3. Remove the old detector element, axial spacer, and RF washer and
discard the detector element.

4. Install the RF washer, axial spacer, and new detector element. Refer to
the illustrations on page 11 for proper orientation for the internal
components.

a. Insert the RF washer first.
b. Then carefully insert the large pin end of the detector element into

the center contact inside the detector body.

c. Place the axial spacer over the smal l pin end of the det ect or el ement.

5. Carefully place the connector cap over the body and assembled
components and tighten firmly in place.

Load Resistor Parts Replacement

6. Place the compression spring into the center conductor of the female
BNC connector. Carefully start the spring over the small pin of the
detector element through the hole in the connector cap. Keep the spring
in the BNC connector and screw the female BNC connector firmly into
place.

To replace the male BNC connector

Parts referred to in the following procedures are identified in Figure 2 on

page 9 and Figure 3 on page 10.

1. Remove the male BNC connector and lock washer from the housing.
Use a 3/8-inch open-end wrenc h and hold the housing either in a vise or

with pliers. Be sure to pro tect the housing of the load resistor with
material such as heavy paper or tape or use plastic jaws on the vise or
pliers.

2. Unsolder the resistor.

3. Solder the resistor to the new BNC connector.

4. Let the resistor cool and then check the resistance from male BNC pin
through the resistor. The resistance measurement should be ± 10% than
indicated by the color coding.

5. Replace the lockwasher and male BNC connector.

8 Agilent 423B and 8470B Detectors

Service Instructions

To replace the female BNC connector

1. Remove the female BNC connector. Refer to Figure 3 for parts
identification.

To remove or install the BNC connector, use a BNC wrench or use a
male BNC connector as a wrench to prevent damage to the connector.

2. Unsolder the contact spring.

3. Prepare the replacement female BNC connector:
a. Cut the center conductor lead to approximately 0.79 mm (1/32 in.)
b. With a flat file, smooth the end of the lead; remove burr with

tweezers of similar metal instrument.

4. Slip the contact spring over the center conductor lead, and solder.

CAUTION Use solder sparingl y or i t wi ll creep back on the spri ng. Solder on the spring

will destroy its usefulness and it is difficult to remove.

5. Let the contact spring cool and then screw the connector into the mount.

To replace the 7-mm connector center contact

1. Refer to “7-mm Connectors” on page 13 for assembly and disassembly
instructions.

2. Refer to “Replacing the 7-mm Center Contact” on page 14 for the
center contact replacement proce dur e.

Figure 2 Cutting Center Conductor Lead to Accommodate Contact Spring

Agilent 423B and 8470B Detectors 9

Service Instructions

Figure 3 Load Resistor, Cutaway View

10 Agilent 423B and 8470B Detectors

Service Instructions

Figure 4 8470B and 8470B Option 012 Detector Assemblies

Figure 5 423B Detector

Agilent 423B and 8470B Detectors 11

Service Instructions

Replacement Parts Table

Description Part Number Description Part Number

423B Assembly Connector, RF 7 mm 1250-0909

Contact, RF connector 1250-0014 Spring, compression 1460-2606
Gasket, RF connector 1250-0015 Washer, lock internal 2190-0016
Ring, RF connector 1250-0016 Cap, connector 5020-0210
Connector, female BNC 1250-0212 Washer, cap 5021-0127
Nut, RF connector 1250-0918 Insulator 5040-0306
Spring, compression 1460-2606 Conductor, center 08470-20002
Washer, lock internal 2190-0016 Ring, RF connector (Opt 012) 1250-0016
Bead, connector 5020-0207 Connector, RF APC (Opt 012) 1250-0916
Cap, connector 5020-0210 Contact, RF connector (Opt 012) 1250-0917
Washer, cap 5021-0127 Nut, RF connector (Opt 012) 1250-0918
Conductor, center 00423-201
Body , crystal mount 00423-202

Replacement Diode Assemblies

1

Replacement Diode Assemblies

Single diode negative polarity

Single diode positive polarity (Opt 003)

1

08470-60012

08470-60013

Single diode negative polarity 00423-60003
Single diode positive polarity (Opt 003) 00423-60004
Single diode negative polarity with

00423-60005

matching load resistor (Opt 002)
Matched pair diodes negative polarity

00423-60007

Single diode negative polarity with
matching load resistor (Opt 002)

Single diode positive polarity with
matching load resistor (Opt 002)

08470-60014

08470-60015

(Opt 001)

8470B 7-mm

Load Resistor Assembly

Connector, male BNC 1250-0045

Connector Assembly

Inner conductor contact mechanism
(assembled contact and outer body)

1250-0816

Connector, female BNC 1250-0251 Coupling nut 1250-0918
Spring, contact 5000-0234 Coupling sleeve 1250-0820
Housing 5020-3215 Inner conductor contact 1250-0907

Support bead 5040-0306

8470B and 8470B-012 Assemblies

Connector, female BNC

Contact, RF connector 1250-0816

1

1250-0212

Tools

7-mm contact extractor

7-mm spanner wrench
Open-end wrench

5060-0370
5060-0237
8710-0877

1. Refer to page 1 for a description of options.

12 Agilent 423B and 8470B Detectors

7-mm Connectors

Service Instructions

Figure 6 Use and Care of 7-mm Connectors

To Connect 1. On one connector, retract the coupling sleeve by turning the coupling

nut counterclockwise until the sleeve and nut disengage.

2. On the other connector, fully extend the coupling sleeve by turning the
coupling nut clockwise. To engage coupling sleeve and coupling nut
when the sleeve is fully retracted, press back lightly on the nut while
turning it clockwise.

3. Push the connectors firmly together, and thread the coupling nut of the
connector with retracted sleeve over the extended sleeve.

4. Close the gap between coupl ing nuts with th e nut on the e xtended-s leeve
connector.

To Disconnect 1. Loosen the coupling nut of the connector showing the wider gold band.

2. IMPORTANT: Part the conne ctors car efully t o prevent s triking the i nner
conductor contact.

Agilent 423B and 8470B Detectors 13

Service Instructions

Care 1. Keep contacting surfaces smooth and clean. Irregularities and foreign

particles can degrade electrical performance.

2. Protect the contacting surfaces when the connector is not in use by
leaving the coupling sleeve extended.

3. Use lintless material an d/o r f ir m-bristled brush such as a tooth brush for
cleaning. If a cleaning fluid is needed, use isopropyl alcohol.

NOTE Do not use aromatic or chlorinated hydrocarbons, esters, ethers, terpenes,

higher alcohols, ketones, or ether-alcohols such as benzene, toluene,
turpentine, dioxane, gasoline, cellosolve acetate, or carbon tetrachloride.
Keep exposure of the connector parts to both the cleaning fluid and its
vapors as brief as possible.

Replacing the 7-mm Center Contact

Through wear or damage the contact in the center conductor many need
replacing. This contact is a small four-pronged collet which snaps into a
recess in the center conductor. This contact is normally held in by the
spring-action of the four prongs. With a magnifying glass, examine this
contact to determine if it needs replacement

CAUTION DO NOT REMOVE THIS CONTACT FOR INSPECTION AS IT MAY BE

DAMAGED BY REMOVAL.

14 Agilent 423B and 8470B Detectors

.

Service Instructions

Coupling
Sleeve

See Detail "A"

Inner
Conductor
Contact

Support Bead

Coupling Nut

Inner
Conductor
Mating Plane

Detail "A"

Outer
Conductor
Mating Plane

The pin depth is measured
"after" inner conductor contact
removal.

The contact should be free of burrs or wear and the prongs sh ould be equally
spaced. If the contact is removed, do NOT re-use it (it may be damaged by
removal).

If the contact needs replacement and a new contact is available, proceed as
follows:

1. Place the instrument so the connector faces down, if possible.

2. Tap the connector lightly and the contact should now protrude slightly.
Insert the centering pin of the collet remover (5060-0236) with the jaws
open.

3. Allow the jaws on the tool used to close and pull straight back from the
connector without twisting. The contact should come out with the tool.
If not, repeat the process. Do NOT re-use the contact.

4. Snap in a new contact by pushing a new contac t in place. Test the action
of the new contact by pushing in on it. It should spring out again when
released.

Agilent 423B and 8470B Detectors 15