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HP 8481H/82H
General Information
General Information
This Operating and Service Manual contains information about
initial inspection, performance tests, adjustments, operation,
troubleshooting and repair of the HP Model 8481H and 8482H Power
Sensors.
On the cover of this manual is a "Microfiche" part number. This
number can be used to order a 4 x 6-inch microfilm transparency of
the manual.
Instruments Covered by
Manual
This instrument has a two-part serial number. The first four digits
and the letter comprise the serial number prefix. The last five digits
form a sequential suffix which is unique to each instrument. The
contents of this manual apply directly to instruments having the
serial number prefix 2703A and 2704A.
If your instrument has a serial number prefix less than 2703A or
2704A additional information is located in the "Backdating" section
at the end of this manual. If your instrument has a serial number
prefix greater than 2703A or 2704A look for a yellow "Manual
Changes" supplement that documents the difference.
In addition to change information, the supplement may contain
information for correcting errors in the manual. To keep this
manual as current and accurate as possible, Hewlett-Packard
recommends that you periodically request the latest "Manual
Changes" supplement. The supplement is keyed to the manual print
date and part number, both of which appear on the front cover.
Copies of the supplement are available on request from your nearest
Hewlett-Packard office.
For information concerning a serial number prefix not listed here, in
"Backdating" or in the "Manual Changes" supplement, contact your
nearest Hewlett-Packard office.
Description
The Power Sensors are used for measuring the average power
supplied by an RF source to a 50-ohm load. In use, the Power Sensor
is connected to the RF source and to a compatible power meter.
(Suitable meters are the HP 435A or 436A Power Meter.) The Power
Sensor places a 50-ohm load on the RF source, and the power meter
indicates the power dissipated in this load. The power is determined
from the RF voltage developed across the Power Sensor load, and is
expressed in /xW (or W) and dBm. The HP 436A Power Meter can
also provide readings, in dB, relative to a previous RF input to the
Power Sensor.
The Power Sensors measure power levels from —10 dBm to -|-35 dBm
(10 /xW to 3W), at frequencies from 10 MHz to 18 GHz (HP 8481H)
or 100 kHz to 4.2 GHz (HP 8482H).
The physical configuration of both sensors is the same. However,
because of the different frequency ranges covered, there are some
changes in page numbers and component values.
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