Errata
This manual may contain references to HP or Hewlett-Packard. Please note that Hewlett-Packard's former test
and measurement, semiconductor products and chemical analysis businesses are now part of Agilent
Technologies. To reduce potential confusion, the only change to product numbers and names has been in the
company name prefix: where a product number/name was HP XXXX the current name/number is now Agilent
XXXX. For example, model number HP8648 is now model number Agilent 8648.
Ce manuel peut contenir des références à <<HP>> ou <<Hewlett-Packard.>> Veuillez noter que les produits de
test et mesure, de semi-conducteur et d'analyse chimique qui avaient fait partie de la société Hewlett-Packard
sont maintenent une partie de la société Agilent Technologies. Pour reduire la confusion potentielle, le seul
changement aux noms de reference a été dans le préfixe de nom de société : là où un nom de référence était HP
XXXX, le nouveau nom de référence est maintenant Agilent XXXX. Par example, le HP 8648 s'appelle
maintenent Agilent 8648.
Diese Gebrauchsanweiseung kann Bezug nehmen auf die Namen HP oder Hewlett-Packard. Bitte beachten Sie,
dass ehemalige Betriebsbereiche von Hewlett-Packard wie HP-Halbleiterprodukte, HP-chemische Analysen
oder HP-Test- und Messwesen nun zu der Firma Agilent Technology gehören. Um Verwirrung zu vermeiden
wurde lediglich bei Produktname und - Nummer der vo laufende Firmenname geändert: Produkte mit dem
Namen/Nummer HP XXXX lauten nun mehr Agilent XXXX. Z.B, das Modell HP 8648 heißt nun Agilent 8648.
Questo manuale potrebbe contenere riferimenti ad HP o Hewlett-Packard. Si noti che le attività precedentemente
gestite da Hewlett-Packard nel campo di Test & Misura, Semiconduttori, ed Analisi Chimica sono ora diventate
parte di Agilent Technologies. Al fine di ridurre il rischio di confusione, l'unica modifica effettuata sui numeri di
prodotto e sui nomi ha riguardato il prefisso con il nome dell'azienda : dove precedentemente compariva "HP
XXXX" compare ora "Agilent XXXX". Ad esempio: il modello HP8648 è ora indicato come Agilent 8648.
Este manual puede hacer referencias a HP o Hewlett Packard. Las organizaciones de Prueba y Medición (Test
and Measurement), Semiconductores (Semiconductor Products) y Análisis Químico (Chemical Analysis) que
pertenecían a Hewlett Packard, ahora forman parte de Agilent Technologies. Para reducir una potencial
confusión, el único cambio en el número de producto y nombre, es el prefijo de la compañía: Si el producto solía
ser HP XXXX, ahora pasa a ser Agilent XXXX. Por ejemplo, el modelo HP8648 es ahora Agilent 8648.
Document Part Number 5971-2668
Printed in the UK September 2004
A
マニュアル・チェンジ
変更
本文中の「HP（YHP）」、または「(横河)ヒューレット・パッカード株式会社」とい
う語句を、「Agilent」、または「アジレント・テクノロジー株式会社」と変更して
ください。
ヒューレット・パッカード社の電子計測、半導体製品、化学分析ビジネス部門は分
離独立し、アジレント・テクノロジー社となりました。
社名変更に伴うお客様の混乱を避けるため、製品番号の接頭部のみ変更しておりま
す。
（例: 旧製品名 HP 4294A は、現在 Agilent 4294A として販売いたしておりま
す。）
User’s Guide
V8486A Power Sensor
Serial Number Prefix:
US3901
Part Number: 08486-90131
Printed in USA
Print Date: June 2001
Supersedes: January 1999
© Copyright 1999, 2001 Agilent Technologies, Inc.
1. V8486A Power Sensor
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Calibration Factor (CF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Initial Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Storage and Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Operating Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Operating Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Power Meter Calibrations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Power Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Modulation Effects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Linearity Correction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Performance Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Replaceable Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Repair and Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3
1 V8486A Power Sensor
1
V8486A Power Sensor
User’s Guide
Figure 1-1 V8486A Power Sensor with Accessories and Hardware
2 Chapter 1
V8486A Power Sensor
User’s Guide
General Information
This Operating Manual contains information about initial inspection and
operation of the V8486A Power Sensor.
Warranty
The Power Sensor is warranted and certified as indicated on the last
page of this manual. Do not open the Power Sensor. Any attempt to
disassemble the Power Sensor will void warranty.
Description
The V8486A is a diode-based power sensor. It measures power levels in a
range from −30 dBm to +20 dBm. (Specifications for the Power Sensor
are in Table 1-1.) The V8486A measures at frequencies from 50 GHz to
75 GHz.
The power is determined from the ac voltage developed across the
waveguide termination from the microwave source. The diodes convert
this ac voltage to dc. The dc voltage produced is proportional to the
square of the ac voltage. The dc voltage thus generated is a very low-level
voltage and requires amplification before it can be transferred via the
sensor cable to the power meter.
The amplification is provided by an input amplifier assembly which
consists of a chopper (sampling gate) and an input amplifier. The dc
voltage is routed to the chopper circuit which converts the low-level dc
voltage to an ac voltage. The chopper is driven by a square wave
generated by the power meter. The result is an ac output signal
proportional to the dc input. The ac signal is then amplified by the input
amplifier. The relatively high-level ac signal output can now be routed by
standard cables.
Chapter 1 3
V8486A Power Sensor
User’s Guide
NOTE The V8486A Power Sensor is compatible with the following power
meters:
435B E1416A
436A E4418A/B
437B E4419A/B
438A 70100A
To obtain optimum accuracy for power measurements above +10 dBm,
when used with the E4418A and E4419A power meters, a firmware
upgrade will be required. Refer to your E4418A and E4419A power
meter’s user’s guide for instructions on how to obtain the revision of the
firmware currently installed in the unit. The firmware revision required
is A1.03.00 (or above) for the E4418A and A2.03.00 (or above) for the
E4419A. Contact your local Agilent Technologies Sales and Service Office
for more information.
In application, the Power Sensor is connected between a microwave
source and a compatible power meter. The Power Sensor provides a
matched load for the microwave source for very low SWR. The power
meter indicates the power dissipated in the load in µW, mW or in dBm.
CAUTION Do not disassemble the Power Sensor. The Power Sensor is extremely
static-sensitive and can be easily damaged.
Accessories
Included is a hex ball driver plus the waveguide mounting screws. Refer
to Figure 1-1 for a visual check of what should be included with your
power sensor.
4 Chapter 1
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