Keysight 8473B Service manual

Keysight 8473B/C Detectors
Operating and
Service Guide

2 Keysight 8473B/C Operating and Service Guide
Notices
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Manual Part Number
08473-90003
Edition
Edition 5, January 16, 2019
Printed in:
Printed in Malaysia
Published by:
Keysight Technologies
Bayan Lepas Free Industrial Zone,
11900 Penang, Malaysia
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Warranty
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Safety Information
CAUTION
A CAUTION notice denotes a hazard. It
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A WARNING notice denotes a hazard. It
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dure, 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.

Keysight 8473B/C Operating and Service Guide 3
Waste Electrical and Electronic Equipment (WEEE) Directive
This instrument complies with the WEEE Directive 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/detectors
(product-specific information and support, software and
documentation updates)
–www.keysight.com/find/assist
(worldwide contact information for repair and service)

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Keysight 8473B/C Operating and Service Guide 5
Table of Contents
Waste Electrical and Electronic Equipment (WEEE) Directive . . . . . . . .3
Product category: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Sales and Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
1Introduction
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
2 Specifications
Product Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
3 Installation, Operation, and Service
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Initial inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Mating connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Storage and Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Original packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Operating information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Operator’s checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Performance Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Frequency response test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
High level sensitivity test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Low level sensitivity test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Match test (SWR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

6 Keysight 8473B/C Operating and Service Guide
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Keysight 8473B/C Operating and Service Guide 7
List of Figures
Figure 3-1 Typical frequency response of the 8473B or 8473C
detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Figure 3-2 Peak power measurement . . . . . . . . . . . . . . . . . . . . . .24

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Keysight 8473B/C Operating and Service Guide 9
List of Tables
Table 2-1 Product specifications . . . . . . . . . . . . . . . . . . . . . . . . .14
Table 2-2 Environmental specifications . . . . . . . . . . . . . . . . . . . .16
Table 2-3 Physical specifications . . . . . . . . . . . . . . . . . . . . . . . . .17

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Keysight 8473B/C Detectors
Operating and Service Guide
11
1 Introduction
Overview 12
This chapter introduces the 8473B and 8473C crystal detectors and its available
Options.

1Introduction
12 Keysight 8473B/C Operating and Service Guide
Overview
This manual contains operating instructions for the Keysight 8473B and 8473C
Crystal Detectors. Included in the manual is the information required to install and
test the crystal detector.
Description
The Keysight 8473B and 8473C crystal detector is a 50-Ω(nominal) device
designed for measurement use in coaxial systems. The detector converts RF
power levels applied to the 50-Ωinput connector into proportional values of DC
voltage. The RF input connector is a male APC 3.5 type connector (SMA
compatible). The detector module uses a Low Barrier Schottky diode and thin film
matching circuit that yield high sensitivity and broadband performance. The
detector measures relative power up to 200 mW and has a BNC female connector
for the output jack which allows the detected output to be connected to a SWR
meter. The output voltage polarity is negative, unless Option 003 is selected. The
frequency range is 10 MHz to 18 GHz for the 8473B, and 10 MHz to 26.5 GHz for
the 8473C. Complete specifications for the crystal detectors are available in
Chapter 2, “Specifications,” starting on page 15.
Options
The crystal detector is available with the following options (see Table 2-1 on
page 14 for further descriptions):
Option 001:
Matched pair of detectors.
Option 002:
Square law load.
Option 003:
Positive polarity output.

Keysight 8473B/C Detectors
Operating and Service Guide
13
2 Specifications
Product Specifications 14
Environmental Specifications 16
Physical Specifications 17
This chapter provides an overview specifications of Keysight 8473B/C crystal
detector.

2 Specifications
14 Keysight 8473B/C Operating and Service Guide
Product Specifications
Specifications are listed in Table 2-1, Table 2-2, and Table 2-3. These
specifications are the performance standards, or limits against which the
instrument may be tested.
NOTE
RF may leak through the output connector, especially below 1 GHz. It can be
reduced, if objectionable, with a suitable low-pass filter.
Table 2-1 Product specifications
8473B 8473C
Frequency range (GHz) 0.01 to 18 0.01 to 26.5
Frequency response[a] [b] [c] – ±0.2 dB over any octave to 8 GHz
– 0.01 to 12.4 GHz: ±0.3 dB
– 0.01 to 18 GHz: ±0.6 dB
– ±0.2 dB over any octave to 8 GHz
– 0.01 to 12.4 GHz: ±0.3 dB
– 0.01 to 20 GHz: ±0.6 dB
– 20 to 26.5 GHz: ±1.5 dB from a –3.3
dB linear slope.
Maximum operating input power 200 mW, peak or average 200 mW, peak or average
Maximum short term input power 1 watt (typical) peak or average for <1
minute
1 watt (typical) peak or average for <1
minute
Sensitivity[a][d]
Low level <–20 dBm
High level
>0.5 mV/μW
<0.35 mW produces 100 mV output
– 0.01 to 18 GHz: >0.5 mV/μW
– 18 to 26.5 GHz: >0.18 mV/μW
<–0.35 mW produces 100 mV output up
to 18 GHz
SWR[a] [b] – 0.01 to 4 GHz: 1.2
– 4 GHz to 18 GHz: 1.5
– 0.01 to 4 GHz: 1.2
– 4 to 18 GHz: 1.5
– 18 to 26.5 GHz: 2.2
Input impedance 50 Ω (nominal) 50 Ω (nominal)
Output impedance[b] 1 to 2 KΩ(typically 1.3 KΩ) shunted by
20 to 60 pF (typically 30 pF)
1 to 2 KΩ(typically 1.3 KΩ) shunted by
20 to 60 pF (typically 30 pF)

Specifications 2
Keysight 8473B/C Operating and Service Guide 15
Output polarity Negative (refer to options for positive
polarity units)
Negative (refer to options for positive
polarity units)
Bias Not required Not required
Noise <50 μV p-p with CW applied to produce
100 mV output, 400 kHz bandwidth
<50 μV p-p with CW applied to produce
100 mV output, 400 kHz bandwidth
Options
001
Frequency response characteristics
(exclusive of basic sensitivity) track
within values listed to the right.
Matched detector pair
– 0.01 to 12.4 GHz: ±0.2 dB
– 0.01 to 18 GHz: ±0.3 dB
Matched detector pair
– 0.01 to 12.4 GHz: ±0.2 dB
– 0.01 to 18 GHz: ±0.3 dB
– 0.01 to 26.5 GHz: ±0.5 dB
002
By choosing Option 002, the deviation
from ideal square law response will be
±0.5 dB, although the sensitivity
specification is decreased by a factor
of 4.
Square law load Square law load
003 Positive polarity output Positive polarity output
[a] Specifications given for +25° C unless otherwise noted.
[b] Measurement made at –20 dBm
[c] See Figure 3-1 on page 21.
[d] Sensitivity decreases with increasing temperature, typically:
0.5 dB from –20° C to +25° C; 0.5 dB from +25° C to +40° C;
1 dB from +40° C to +55° C; 1.25 dB from +55° C to +75° C;
1 dB from +75° C to +85° C.
Table 2-1 Product specifications (continued)
8473B 8473C

2 Specifications
16 Keysight 8473B/C Operating and Service Guide
Environmental Specifications
Table 2-2 Environmental specifications
8473B 8473C
Operating temperature –20° C to +85° C –20° C to +85° C
Humidity <95% relative <95% relative
Vibration 20 G from 80 to 2,000 Hz 20 G from 80 to 2,000 Hz
Shock 100 G for 11 ms 100 G for 11 ms
Altitude 4,570 m (15, 000 ft.) 4,570 m (15, 000 ft.)
Storage The instrument should be stored in a clean, dry environment. The following
environmental limitations apply to both storage and shipment:
– Temperature: –54° C to +85° C
– Humidity: <95% relative
– Altitude: <7,620 meters (25,000 feet)
– Shock: 100 G for 11 ms
– Vibration: 20 G from 80 to 2,000 Hz

Specifications 2
Keysight 8473B/C Operating and Service Guide 17
Physical Specifications
Table 2-3 Physical specifications
8473B 8473C
Weight Net 14 g (0.5 oz.) Net 14 g (0.5 oz.)
Dimension 48 mm long, 10 mm diameter
(1.9 in. long, 0.38 in. diameter)
48 mm long, 10 mm diameter
(1.9 in. long, 0.38 in. diameter)

2 Specifications
18 Keysight 8473B/C Operating and Service Guide
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Keysight 8473B/C Detectors
Operating and Service Guide
19
3 Installation, Operation, and
Service
Installation 20
Storage and Shipment 21
Performance Tests 26
Adjustments 28
Service 28
This chapter describes the installation and operating procedures for the crystal
detectors. It also describes the available performance tests used for testing the
detector specifications.

3 Installation, Operation, and Service
20 Keysight 8473B/C Operating and Service Guide
Installation
Initial inspection
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. The procedures for checking electrical
performances are given under “Performance Tests” on page 26. If the contents are
incomplete, if there is mechanical damage or defect, or if the instrument does not
pass the electrical performance test, notify the nearest Keysight office. If the
shipping container is damaged, or the cushioning material shows signs of stress,
notify the carrier as well as the Keysight office. Keep the shipping materials for the
carrier’s inspection. At Keysight’s option, the office will arrange for repair or
replacement without waiting for claim settlement.
Mating connectors
The mating output connector used with the crystal detector must be a male BNC
connector. The mating RF input connector must be a female APC 3.5 (SMA
compatible) connector.