Keysight Technologies Compatibility of USB Power Sensors with

Keysight Technologies Compatibility of USB Power Sensors with
Keysight Technologies
Compatibility of USB Power Sensors
with Keysight Instruments
Application Note
02 | Keysight | Compatibility of USB Power Sensors with Keysight Instruments – Application Note
Table of Contents
Use USB Power Sensors as a Keysight Instruments
Accessory
Keysight USB Power Sensors . . . . . . . . . 2
In many of today’s power measurement applications there is a need to make power
measurements and use other instruments such as a spectrum analyzer, vector network
analyzer or signal generator. Traditional power-measurement methodologies require
a power meter and a power sensor. This situation increases the costs of a test system
significantly. Alternatively, Keysight Technologies, Inc. USB power sensors can be used
as an accessory with other Keysight instruments, allowing the power measurement to
be done via Keysight instruments, and perform other specific power measurement
applications without the need for a PC/laptop.
USB Power Sensor’s Compatibility
with Keysight Instruments . . . . . . . . . . . . 3
How Does It Work?
–– N5230C PNA-L Vector Network
Analyzer . . . . . . . . . . . . . . . . . . . . . 5
–– E5071C ENA Vector Network
Analyzer . . . . . . . . . . . . . . . . . . . . . . 7
–– N9340x Handheld Spectrum
Analyzer . . . . . . . . . . . . . . . . . . . . . . 9
–– X-Series Signal Generator . . . . . . . 13
–– FieldFox RF Analyzer . . . . . . . . . . . . 17
Conclusion . . . . . . . . . . . . . . . . . . . . . . . 18
Related Literature . . . . . . . . . . . . . . . . . 18
Product Web Site . . . . . . . . . . . . . . . . . . 18
This application note explains how the Keysight USB power sensor performs source
power calibration with the N5230A PNA-L, and scalar analysis of a frequency converter
with the E5071C ENA vector network analyzer. The USB power sensors are able to
augment the FieldFox handheld analyzer, N9340A handheld spectrum analyzer, and
X-Series signal generator with a power meter function. Keysight USB sensor are also
able to provide user flatness correction (UFC) with external leveling and automatically
level RF power amplifier output as well as USB pass through commands using the
X-Series signal generator.
Keysight USB Power Sensors
Making an accurate power measurement requires both a power meter and power sensor.
The power sensor converts the RF signal and microwave signal into analog signals.
Subsequently, the power meter performs the statistical processing and displays the
result in decimal/trace format. Today, the combination of a power meter and power
sensor makes the USB power sensor a standalone instrument that provides an affordable
solution for power measurement. Results of the power measurement can be retrieved
Keysight N1918A Power Analysis Manager software or BenchVue Power Meter App
software on the PC via a USB cable or SCPI commands. The power-measurement
readings are retrieved using standard SCPI commands or VIV-COM/IVI-C drivers. The
SCPI-based command set provides a user-friendly programming environment and allows
the use of the same method of communication for both the power sensor and the power
meter.
Keysight offers four families of USB power sensors compatible with other Keysight
instruments such as the vector network analyzer, spectrum analyzer, signal generator,
cable and antenna tester, and FieldFox handheld analyzer:
–– U2000A Series USB average power sensors
–– U2020 X-Series USB peak and average power sensors
–– U8480 Series USB thermocouple power sensors
–– U2040 X-Series wide dynamic range peak and average power sensors
(except U2049XA LAN Power Sensor)
When USB power sensors are connected to these instruments without the need of
PC/laptop, they can be powered-up to perform the specific application.
Figure 1. Keysight USB power sensors
03 | Keysight | Compatibility of USB Power Sensors with Keysight Instruments – Application Note
USB Power Sensor’s Compatibility with Keysight Instruments
Keysight instruments such as vector
network analyzers, spectrum analyzers,
signal generators, cable and antenna
testers, and FieldFox RF analyzers are
now compatible with the Keysight USB
power sensors (see Table 1 and Figure 2).
Each compatible instrument has built-in
firmware to support the USB power
sensor, unless it specifically requires the
N1918A Power Analysis Manager software,
BenchVue Power Meter App software,
or the Visual Basic Assistant (VBA)
application.
Table 1. Keysight USB power sensors compatible with Keysight instruments
Keysight USB/LAN power sensors
Keysight
instruments Model number
Vector
network
analyzer
Vector network analyzer
–– Performs the source power
calibration for providing accurate
output power levels
–– Plot the power sensor's power
measurement on the VNA's display
(Power Meter As Receiver function,
available on PNA-X, PNA, PNA-L
and E5080A)
Spectrum
analyzer/
signal
analyzer
X-Series signal generator
(EXG and MXG)
–– Performs user flatness correction
(UFC) with external leveling. Also
turns the instrument into a power
meter. Displays power measurement
with its built-in user interface (UI),
which integrates the display of USB
power sensor measurements
–– Supports and displays two USB power
sensor measurements on a signal
generator display. Automatically levels
RF power amplifier output with power
servo feature. Uses USB pass through
commands to remotely control and
program the power sensor.
Signal
generator
Fieldfox
handheld
analyzer
U2000 U2020
Series X-Series
U8480
Series
U2041-44XA
USB Sensor
U2049XA
LAN sensor
PNA: E836xA/B/C
Yes
No
No
No
No
PNA: N522xA
Yes
Yes
PNA-X: N524xA/N5264A Yes
PNA-L: N5230A/C
Yes
Yes
3
Yes3
Yes
Yes
Yes3
Yes3
Yes
No
No
No
No
PNA-L: N5231/2/3/4/5A Yes
Yes
Yes
Yes
ENA: E506XA/B
No
No
No
No
No
ENA: E5071C
Yes
No
No
No
No
ENA: E5072A
Yes
No
No
No
No
ENA: E5080A
Yes
Yes
Yes
Yes
Yes
N9340B
Yes
No
No
No
No
Handheld SA: N9342C/
N9343C/N9344C
Yes
Yes
Yes
No
No
N9320B
Yes
No
No
No
No
BSA: N9322C
Yes
Yes
Yes
No
CXA: N9000A
Yes
Yes
CXA-m: N9290A
Yes1
MXA: N9020A
3
Yes3
No
Yes
Yes
2
Yes2
Yes1
Yes1
Yes2
Yes2
Yes1
Yes1
Yes1
Yes2
Yes2
EXA: N9010A
Yes
Yes
Yes
Yes
2
Yes2
PXA: N9030A
Yes1
Yes1
Yes1
Yes2
Yes2
EXG: N517xB
Yes
Yes
Yes
Yes
No
MXG: N518xA/B and
N516xA
Yes
Yes
Yes
Yes
No
UXG: N5193A
Yes
Yes
Yes
Yes
No
N991xA microwave
combination analyzer
Yes
Yes
Yes
Yes
No
N992xA microwave
vector network analyzer
Yes
Yes
Yes
Yes
No
N993xA microwave
spectrum analyzer
Yes
Yes
Yes
Yes
No
1
1
1
1
1
1
1. Require installation of N1918A Power Analysis Manager software. Refer to the N1918A Installation
Guide (N1918A-90002) for PC hardware requirements.
2. Required installation of BenchVue-Power Meter Software. Refer to the BenchVue Software Data
Sheet (5991-3850EN) for PC hardware requirements.
3. Supported by instruments installed with Window 7 only.
04 | Keysight | Compatibility of USB Power Sensors with Keysight Instruments – Application Note
Handheld/RF spectrum analyzer
and cable and antenna tester
Turns the instrument into a power meter.
Displays power measurement with its
built-in UI, which integrates the display of
USB power sensor measurements.
FieldFox handheld analyzer
Turns the instrument into a power meter.
Displays power measurement with its
built-in UI. Supports average and peak
power measurements under Free Run
mode, as well as pulse measurement
under Continuous mode.
Spectrum analyzer
(MXA, EXA and PXA)
To display the power measurement on
spectrum analyzer with the N1918A Power
Analysis Manager or BenchVue Power
Meter App software.
PNA Vector
Network Analyzer
PNA-X Vector
Network Analyzer
PNA-L Vector
Network Analyzer
ENA Vector Network
Analyzer
* Requires VBA wizard
FieldFox Handheld
Analyzer
E/MXG Signal Generator
Handheld Cable and
Antenna Tester
E/M/PXA Signal Analyzer
* Requires N1918A or BenchVue
Power Meter App software
RF Spectrum Analyzer
Handheld Spectrum
Analyzer
Note: Each compatible instrument comes with built-in firmware to support the USB power sensor, unless specified that N1918A Power Analysis Manager,
BenchVue Power Meter App software or VBA wizard is required.
Figure 2. USB power sensors’ compatibility with Keysight instruments
05 | Keysight | Compatibility of USB Power Sensors with Keysight Instruments – Application Note
How Does It Work?
N5230C PNA-L vector
network analyzer
N5230C PNA-L
–– Performs the source-power
calibration.
–– Provides output power in order
to measure gain compression,
inter-modulation distortion, and
other device parameters accurately.
With source power calibration, the power
at a certain point is calibrated to be within
the range of the uncertainty of the power
meter and sensor.1
Traditionally, the source power calibration
is performed through GPIB connectivity
and supported by the Keysight power
meter and sensor (see Figure 3). This
solution requires a large space for
storing the power meter and sensor in
the production test area, along with
considerable expense to acquire a power
meter and sensor just for source power
calibration purposes. Today, USB power
sensors offer a solution that is integrated
with the PNA. The USB power sensors are
used to replace both the power meter and
sensor (see Figure 4) in the source power
calibration process. A USB sensor provides
the direct connection into the PNA USB
port via USB plug&play connectivity.
Throughout the source power calibration
process, the PNA can be configured to
detect the power meter (via GPIB) or USB
power sensor (via USB) from the power
meter setting of the PNA (see Figure 5).
1. For details about the source power calibration
procedure, please refer to the Keysight Web
site’s PNA Source Power Cal procedure
online help file (Power Calibration, under the
Calibrating a Measurement section). You can
readily obtain the procedure from Network
Analyzer’s Help menu.
Power meter
GPIB
Coaxial cable
Power sensor
Figure 3. Source Power Cal using both a power meter and power sensor connected to a
PNA through a GPIB connection
N5230C PNA-L
USB port
USB mini-B connector
with locking mechanism
Coaxial cable
USB power sensor
Figure 4. USB power sensor connecting directly to a PNA USB port through a USB mini-B connector
Figure 5. PNA’s power meter setting for configuring USB sensor via a USB connectivity
06 | Keysight | Compatibility of USB Power Sensors with Keysight Instruments – Application Note
How Does It Work? (continued)
Figure 6 and Figure 7 show the results
of source power calibration for EPM and
USB power sensors respectively. The PNA
source is stepped through the specified
range (in this example, stepped from
1 to 6 GHz), and power (at 0 dBm) is
measured with the power meter and
USB power sensor. At each data point,
the source power is adjusted until the
measured power is within the specified
accuracy level.
The source power calibration results can
be saved in a Microsoft Excel file and the
two results combined in a single graph
for comparison (see Figure 8). The results
appear to be comparable and within the
± 0.05 dB limit line.
Figure 6. Source power calibration result with an EPM and E9301A power meter and sensor
Figure 7. Source power calibration result with a USB power sensor
Figure 8. EPM power meter and USB power sensor source power calibration data comparison
07 | Keysight | Compatibility of USB Power Sensors with Keysight Instruments – Application Note
How Does It Work? (continued)
E5071C ENA vector network
analyzer
–– Performs scalar analysis of a
frequency converter, which requires a
VBA application through U2000 Series
USB power sensor.
ENA has a Frequency Offset mode (FOM)
option used to measure the frequency
converter device accurately. The offset
of source and receiver port frequency
can be defined precisely. The receiver
port can detect the down-converter or
up-converter signal. There are limitations
to using FOM to measure the frequency
converter device. First, the local oscillator
(LO) signal of the device under test (DUT)
has to be known and locked to the source
or receiver port frequency of a network
analyzer. Otherwise, the difference
between predicted intermediate frequency
(IF) signal and actual IF signal is directly
converted to a magnitude error because
of the intermediate frequency bandwidth
(IFBW) filter shape implemented in these
network analyzers.
Figure 9 shows the ENA setup in FOM.
IFBW is set to 1 kHz, and the 3 dB
bandwidth (BW) of the IFBW filter is
approximately 1 kHz. If the actual output
frequency of the DUT has an offset such
as 500 Hz (= BW/2) from target frequency,
the magnitude result has a 3 dB error.
When the output signal drifts, the
measurement results are also changed
at the same time.
You can overcome the limitation of FOM by
using the USB power sensor (with network
analyzer VBA, a sample wizard is available)
as a broadband power detector (see
Figure 10). The USB power sensor is used
to measure all power in its bandwidth,
and the measurement results are stable
and not influenced by output signal offset
or drift (see Figure 11). For instance, the
USB power sensor provides USB plug&play
connectivity and easy setup in the network
analyzer.
E5071C ENA Series Network Analyzer with Frequency Offset Mode Option
IF ± ∆f
f1
ADC
f1 – f2 + IF
Port 1
Port 2
DUT
f1
IF
RF
f1 – (f2 ± f)
When IFBW = 1 kHz, then
3 dB BW = 1 kHz
∆f influences magnitude accuracy
f2 ± ∆f
Figure 9. IFBW versus LO frequency drifts with FOM mode
E5071C ENA Series Network Analyzer with USB Power Sensor
IF
f1
ADC
f1 – f2 + IF
Port 2
Port 1
USB connection
DUT
f1
RF
IF
LO
f1 – (f2 ± ∆f)
U200x Power Sensor
∆f does not influence the power
meter’s measurement accuracy
f2 ± ∆f
Figure 10. USB power sensor (broadband detect) versus LO frequency drift
08 | Keysight | Compatibility of USB Power Sensors with Keysight Instruments – Application Note
How Does It Work? (continued)
Figure 11 and Figure 12 show the
measurement result of locked and drifted
LO signals by FOM (see the blue trace) and
the USB power sensor (see the red trace)
respectively. The measurement result of
the USB power sensor shows that it has
good correlation with the FOM result at
locked signal, and is stable with drifted
LO signal.
For details on the frequency offset
procedure and operation of the VBA with
the USB power sensor, please refer to the
Keysight Simple Scalar Network Analysis of
Frequency Converter Devices using U2000
USB Power Sensor Series with ENA Series
Network Analyzers, Application Note.
Figure 11. Measurement results with “Locked” LO (RF power versus IF power)
Figure 12. Measurement results with “Drifted” LO (RF power versus IF power)
09 | Keysight | Compatibility of USB Power Sensors with Keysight Instruments – Application Note
How Does It Work? (continued)
N9340A handheld spectrum
analyzer (HHSA)
Instructions
Power up the N9340A. Connect the USB power sensor to the USB port of the N9340A (see Figure 13).
–– Turns the handheld spectrum analyzer
into a power meter.
–– Displays power measurement with its
built-in UI, which integrates the display
of USB power sensor measurements.
Keystrokes surrounded by [ ] represent
front-panel hardkeys of the instruments,
while keystrokes surrounded by { }
represent softkeys.
Figure 13. HHSA connect with USB power sensor
Press [Mode], use [�] or [�] to select {Power Meter} then press [ENTER] (see Figure 14).
Figure 14. N9340A HHSA turns into a power-meter measurement
Power meter menu
–– Zeroing: Access to zeroing and calibration menu.
–– Meas Disp: Access to measurement display menu and to configure the displayed measurement
resolution and format.
–– Meas Setup: Set up the relative measurement or set display offsets.
–– Preset: Preset the USB power sensor.
10 | Keysight | Compatibility of USB Power Sensors with Keysight Instruments – Application Note
Instructions
3. Press {Zeroing } to perform the internal or external zeroing if necessary (see Figure 15).
Figure 15. External and internal zeroing are performed to reduce the zero offset and noise impact
in order to measure power accurately
Internal zeroing
Internal zeroing uses an electronic switch to isolate the power sensor bulkhead from the internal
measurement circuitry during the procedure, allowing the sensor to be physically connected to an
active RF source when internally zeroing. Therefore, you do not need to disconnect the RF source
or power off the external source during an internal zeroing procedure. This feature makes internal
zeroing more convenient, but you may only use internal zeroing if zero set (Internal) is within the
application requirements.
External zeroing (applicable to the U2000 Series USB average power sensor only)
In external zeroing, the sensor does not use the electronic switch to isolate the measurement
circuitry from the bulkhead. In this case, the RF power must be removed from the bulkhead either
by turning the source off or physically removing it from the sensor during the external zeroing
procedure. External zeroing generally has better zero set performance. The INT or EXT zeroing
selection should be made based on the measurement needs.
By default, internal zeroing is performed by the firmware when the USB sensor is connected to the
N9340A HHSA.
11 | Keysight | Compatibility of USB Power Sensors with Keysight Instruments – Application Note
Instructions
4. Press {Return} > {Meas Disp } (see Figure 16).
Figure 16. Meas Disp menu allows you to configure the display measurement and resolution
The Meas Disp (Measurement Display) menu allows you to configure the measurement display as
follows:
–– Disp Range: Indicates the top and bottom range of display measurement.
–– Resolution: Indicates the measurement resolution’s numeric type in four different levels
(1, 2, 3, or 4). The default Resolution is 3.
–– Disp Mode: You can configure the measurement display either in meter or chart format.
The default Disp Mode is Meter.
–– Chart View: Switches the measurement display to chart view.
–– Pause: Pauses or continues the measurements.
To view the measurement in chart or graph format, press {Disp Mode} > {Chart} (see Figure 17).
Figure 17. Measurement display in chart format
12 | Keysight | Compatibility of USB Power Sensors with Keysight Instruments – Application Note
Instructions
5. Press {Return} > {Meas Setup} (see Figure 18).
Figure 18. Measurement Setup menu with meter-view display measurement
Meas Setup (Measurement Setup) menu allows you to set up the relative measurement or set display
offsets.
–– Freq: Allows the frequency of the RF signal that you are measuring to be set. It optimizes
the accuracy and minimizes measurement uncertainty, especially when making comparative
measurements between signals.
–– Power Range: Allows you to set the power range to Auto or Manual. Using Auto range is
encouraged when there is uncertainty about the power level to be measured.
In Manual range, there are two manual setting: Lower and Upper. Lower range covers the
power from –60 to –10 dBm. Upper range covers the power from –10 to +20 dBm.
–– Limits: Indicates if the measurement result is beyond the configured upper or lower limit.
–– Rel/Offset: Rel (Relative) mode enables a comparison of a measurement result to a reference
value. The relative reading, or difference, can be displayed in either dB or %. The offset setting
can be configured to compensate for signal loss or gain (in dB) in the test setup.
–– Averaging: Allows the measurement averaging to be set in Auto or Manual mode, to average
power readings.
The purpose of averaging is to reduce noise, obtain the desired resolution, and reduce the
jitter in the measurement results. Increasing the value of the measurement average reduces
measurement noise, but the measurement time increases. The default of Averaging is Auto.
–– Step Detect: Reduces the filter settling time after a significant step in the measured power.
The filter can be set to re-initialize upon detection of a step increase or decrease in the
measured power.
–– Meas Interval: Allows you to set the time (in s or ms) to capture the new power measurement
continuously.
13 | Keysight | Compatibility of USB Power Sensors with Keysight Instruments – Application Note
How Does It Work? (continued)
X-Series signal generator
–– Performs user flatness correction
(UFC) with external leveling to improve
power accuracy and flatness.
–– Provides dual display measurement of
two USB power sensors.
–– Automatically levels RF power
amplifiers output with power meter
servo feature.
–– Uses the USB pass through commands
to remotely program the USB power
sensor using USB pass through.
User flatness correction (UFC)
User flatness correction (UFC) with
external leveling provides the ability
to have extremely flat output power at
the testing interface beyond the signal
generator’s RF output connector. If an
external device (such as amplifier, attenuator, coupler, detector, divider, or long
cable) is placed between the RF output
connector and the testing interface, it will
introduce additional gain or loss as well
as frequency response mismatch to the
whole system. Therefore, it is necessary to
perform the UFC with external leveling to
remove this type of influence. In this case,
the USB power sensor integrated with the
MXG offers a solution. The USB power
sensor directly connects to the MXG’s
front panel USB port (see Figure 19),
providing a remote programming function.
The MXG’s built-in UFC personality allows
you to configure the calibration array,
start and stop frequency, and number of
the frequency points to be corrected. The
setup function will observe the difference
between measured power and calibrated
power.
The correction factors of the UFC process
are shown in Figure 20. For details on the
operation and procedure on UFC with
external level use of the measurement,
please refer to Keysight How to Utilize
User Flatness Correction with External
Leveling Using USB Power Sensor on MXG
Signal Generator, Application Note and
Keysight X-Series Signal Generators,
User’s Guide.
Figure 19. Power meter servo configuration
Figure 20. Correction factors automatically performed and displayed on the MXG
14 | Keysight | Compatibility of USB Power Sensors with Keysight Instruments – Application Note
Dual power meter display
function
The dual power meter display function can
be used to display the current frequency
and average power of either one or two
power sensors. For each channel, you can
control the settings for On/Off, channel
frequency, channel offset, averaging and
measurement units, and the dual power
meter display feature.
To use two USB power sensors with the
MXG N518xA or N516xA, a USB hub (with
power supply) can be connected to the
MXG’s front panel USB port (see Figure 21).
Alternatively, the MXG B version, N518xB,
and EXG N517xB signal generators come
with two USB ports on the front panel.
Without the need for an external USB hub,
two USB power sensors can be connected
directly, providing the generator with
two-channel power measurement and
the ability to make measurements
simultaneously.
US
Bh
USB power sensor
ub
USB port
N5183A MXG
Figure 21. Connection diagram of two USB power sensors on MXG via external USB hub
Figure 22. Dual power meter display function on MXG signal generator
15 | Keysight | Compatibility of USB Power Sensors with Keysight Instruments – Application Note
To automatically level RF power
amplifier output with power
meter servo feature.
–– Automatically levels amplifier output
with USB power sensor accuracy
using the X-Series signal generator’s
power meter servo feature
The power meter servo feature uses USB
power sensor readings to adjust the output
power of the source while maintaining a
constant DUT output power. The power
meter servo loop measures the output
power of the DUT, compares it to the
user-provided reference power, and
adjusts the output of the source to achieve
the user-provided power level within
the settling error. This feature enables
the automatic levelling of the RF power
amplifier, which is especially useful for
measurements of EVM, ACLR, LTE, or
W-CDMA signals with a high peak-toaverage ratio.
The power meter servo feature offers two
types of RF levelling modes:
–– Once Leveling: Power Meter Once
performs the adjustment only at the
end of any transition (amplitude or
frequency change). After the adjustment is performed and the power is
corrected, no further adjustments are
performed until the next transition.
–– Continuous Leveling: Power Meter
Continuous performs the adjustment
as in Power Meter Once mode, and
continues to adjust the power
periodically if the value differs by
more than the specified settling error.
Figure 23 shows an example of a power
meter servo configuration with USB power
sensor and signal generator. This example
emphasizes the importance of setting
the amplitude offset as it protects the
amplifier (DUT) from being exposed to
too much power.
For this example, the source amplitude
offset is 20 dB and the source amplitude
is programmed to 25 dBm. The offset is
subtracted from the programmed level,
making the actual source output power
5 dBm. If the USB power sensor measures
24.5 dBm, for example, the output power
will be adjusted by 0.5 dBm since the
power measurement is 0.5 dBm lower
than the desired 25 dBm. The new source
output power is 5.5 dBm. If the USB power
sensor then measures 24.97 dBm, no
further adjustments will be made since
the measured value is within half of the
settling error of 0.2 dB.
If the amplitude offset remained at the
default of 0 dB, the output power set to
25 dBm results in a power measurement
of 40 dBm (assuming the amplifier already
went into compression). The algorithm
would have reduced the source power
by 15 dB, thus outputting 10 dBm and
resulting in a measurement of around
29.5 dBm. The additional reduction of
another 4.5 dB would have led to the same
outcome as with the 20 dB amplitude
offset (source output power of 5.5 dBm).
However, in-between, the DUT could
possibly be stressed past its specified
operating range.
For more information on the operation
of the power meter servo feature,
please refer to Keysight X-Series Signal
Generator, User’s Guide.
USB mini-B cable
Amplifier
N5182B MXG signal generator
Figure 23. Power meter servo configuration
Gain: 20 dB
U204xXA USB
power sensor
16 | Keysight | Compatibility of USB Power Sensors with Keysight Instruments – Application Note
USB pass through SCPI
commands
–– Programs the USB power sensor test
setup with USB pass through SCPI
commands using an EXG/MXG signal
generator
Users typically program USB power
sensors by connecting the sensor to a PC
and remotely controlling it through the
PC. In additional to the dual power meter
display, the EXG/MXG signal generator
now offer an SCPI pass through method of
accessing an attached USB power sensor
(see Figure 24). In this mode, the signal
generator exposes commands that encapsulate USB power sensor commands,
allowing commands and query responses
to pass through the signal generator.
U204xXA USB power sensor
USB mini-B cable
USB/GPIB
interface
N5182B MXG signal generator
PC/laptop
Figure 24. Connection diagram showing a USB power sensor connected to the N5182B MXG signal generator’s
USB port
Figure 25 shows an example of Keysight
VEE software that was written to program
the USB power sensor using the USB
pass through SCPI commands. For more
information on the USB pass through
commands feature, please refer to the
Keysight X-Series Signal Generator,
User’s Guide.
USB pass through
SCPI commands
Figure 25. USB pass through SCPI commands (highlighted in red box) using the X-Series signal generator
17 | Keysight | Compatibility of USB Power Sensors with Keysight Instruments – Application Note
How Does It Work? (continued)
FieldFox handheld analyzer
–– Displays power measurement with
its built-in user interface (UI), which
integrates the display of USB power
sensor measurements
Once the USB power sensors are
connected to FieldFox, the user can
switch the FieldFox to Power Meter mode
and power readings will display on the
FieldFox screen. The UI of power meter
measurement provides the minimum
configuration of power measurement such
as frequency, averaging, single/continuous
measurement, detection mode, zeroing,
and display units measurement. Average
and peak power measurement can be
done via FieldFox depending on the USB
power sensors.
Figure 26. The FieldFox power meter measurement UI
Figure 27. Pulse Measurement mode requires U2020 X-Series USB peak and
average power sensors to measure the RF pulse signal
18 | Keysight | Compatibility of USB Power Sensors with Keysight Instruments – Application Note
Conclusion
The USB power sensors are compact and portable, easy to use, and cost effective
for you as they provide the following benefits:
–– Compatibility with other Keysight instruments such as vector network analyzer,
spectrum analyzer, signal generators, cable and antenna testers, and FieldFox
handheld analyzers.
–– Portability for field applications. The smaller size and light weight of the USB
power sensors allows you to carry them to the site for field applications.
–– Simplified measurement setup with USB power, plug&play connectivity, and
built-in triggering circuit
–– Lower cost without compromising on performance or quality. Standalone USB
power sensors do not need a power meter to provide accurate power measurement
via PC/laptop or other Keysight instrument.
Related Literature
Keysight U2000 Series USB Power Sensors, Technical Overview,
literature number 5989-6279EN
Keysight N9340A Handheld Spectrum Analyzer, Technical Overview,
literature number 5989-5071EN
Keysight Handheld Cable and Antenna Tester, Technical Overview,
literature number 5989-5522EN
Keysight Simple Scalar Network Analysis of Frequency Converter Devices
Using the U2000 USB Power Sensor Series with the ENA Network Analyzer,
Application Note, literature number 5989-8689EN
Product Web Site
For most up-to-date and complete application and product information,
visit Keysight Web site at the following URL:
www.keysight.com/find/usbsensor
19 | Keysight | Compatibility of USB Power Sensors with Keysight Instruments - Application Note
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This information is subject to change without notice.
© Keysight Technologies, 2012-2016
Published in USA, February 2, 2016
5989-8743EN
www.keysight.com
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