Datasheet

Page 3
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Fast measurement speed
The U8480 Series USB thermocouple
power sensors offer a measurement speed
of 900 readings/second (in fast mode),
making them the world’s fastest USB
thermocouple power sensors. This feature
is especially important in high volume
manufacturing, where fast measurement
speed is essential to maximize production
throughput and increase productivity. By
increasing the speed of measurements,
test engineers can shorten the design
cycle and accelerate the product time-to-
market as they would require less time to
carry out the same number of tests.
Real time measurement
uncertainty
Measurement uncertainty is normally
calculated manually by the user. The
U8480 Series USB thermocouple power
sensors now compute this value in real
time and at any given point, removing
the need for manual MU calculations,
shortening test time and providing highly
accurate measurements. Users can also
display power measurements and their
measurement uncertainty simultaneously.
Gamma correction
In an ideal measurement scenario, the
reference impedance of the power sensor
and device-under-test (DUT) impedance
should equal the reference impedance
(Z0); however, this is rarely the case in
practice. The mismatch in impedance
values results in a portion of the signal
voltage being reflected, and this reflection
is quantified by the reflection coefficient,
gamma.
Using the gamma correction function,
users can simply input the DUT’s gamma
into the USB power sensor using SCPI
commands or BenchVue BV0007B power
meter/sensor control and analysis app.
This will remove the mismatch error,
yielding more accurate measurements.
S-parameter correction
Additional errors are often caused by
components that are inserted between
the DUT and the power sensor, such as in
base station testing where a high power
attenuator is connected between the
sensor and base station to reduce the
output power to the measurable power
range of the sensor.
The S-parameters of these components
can be obtained with a vector network
analyzer in the touchstone format, and
inputted into the sensor using SCPI
commands or BenchVue BV0007B power
meter/sensor control and analysis app.
This error can now be corrected using
the U8480 Series USB power sensor’s
S-parameter correction function. The
sensor will behave as though it is
connected directly to the DUT, giving
users highly accurate power
measurements.
Compatibility with other
Keysight instruments
The U8480 Series, like all other Keysight
USB power sensors, can be used as an
accessory for other Keysight instruments,
allowing these instruments to perform
specific power measurement applications
without needing to connect to a PC or
laptop.
The U8480 Series power sensors are
compatible with the Keysight FieldFox
RF analyzers and MXG signal generator,
giving them power meter functionalities,
and with the MXG signal generator, user
flatness correction (UFC) with external
leveling as well. The U8480 Series also
performs source power calibration with
the Keysight PNA, PNA-L and PNA-X
network analyzers. Please refer to the
application note, Compatibility of USB
Power Sensors with Keysight Instruments
(5989-8743EN) for the latest compatibility
information.
Firmware upgrade
The latest firmware for the U8480 Series
includes executable file and help file for
installing the Firmware Upgrade Utility
application in order to upgrade the
USB thermocouple power sensors. To
download the latest firmware version for
the U8480 Series, visit:
www.keysight.com/find/pm_firmware