Keysight Technologies FieldFox N9923A Manuel utilisateur
Quick Reference Guide
FieldFox N9923A
RF Vector Network Analyzer
Contents
Do You Have Everything? ............................2
The Power Button and LED .........................2
Battery Usage...............................................3
Measure S-Parameters ............................... 4
Multi-Trace Configurations .........................6
Measure DTF ................................................ 7
Measure Cable Loss (1-Port) .....................8
Calibration ....................................................9
Power Meter Mode ....................................10
Save and Recall Files.................................11
2
Do You Have Everything?
FieldFox –To check for installed options, press
System then System Configuration then
Options then Show Options
Phase stable jumper cable or adapters –Used to
connect the FieldFox to devices with various
connector types and gender.
Attenuators –Reduces power and prevents
damage to the FieldFox at the test ports.
Cal Kit –T-Calibration Kits or other devices.
MicroSD card or USB flash drive –Save files to
these devices for quick download to a PC.
USB Power Sensor –For making Power Meter
measurements. (Opt 302)
Battery charger or extra battery
The Power Button and LED
To turn power ON, briefly press the power button.
The LED is green. The boot-up takes about 60
seconds.
To switch to Stand by power (low battery drain)
briefly press the power button. The LED is amber and
blinks slowly. To turn power ON, briefly press the
power button. Power and settings are restored
instantly.
To turn Power OFF (very low battery drain) press and
hold the power button until power is shut OFF -
about 4 seconds. The LED is OFF.
3
Battery Usage
A fully charged battery should last about four hours.
Battery charge status is viewable:
In the upper-right corner of the screen.
On the battery. To view the LCD gauge, open the
FieldFox battery compartment door.
To conserve battery power:
Use Hold mode to trigger a measurement only when
needed. Hold is shown on the display.
Press System then Display then Brightness then
dim the FieldFox display as much as possible.
Briefly press the power button to switch to Stand by
mode when not being used. Press again to restore
power. All current settings are preserved.
The FieldFox will shutdown automatically when battery
power is very low to prevent it from being completely
discharged.
Use ONLY a FieldFox charger to recharge a battery.
The battery can be fully charged while in the FieldFox in
about 4 hours with the FieldFox either ON or OFF.
A fully discharged battery takes about 1.5 hours to
recharge to 80%.
The battery can be fully charged in about 4 hours using
the external battery charger (Opt 872).
4
Measure S-Parameters (NA Mode)
S-parameter syntax is described by the following:
S (out | in)
out = FieldFox receiver port
in = FieldFox source port
1. Press Preset then Preset
2. Press Measure 1then choose from the following:
S11 1-port reflection measurement.
S21 2-port transmission measurement.
S12 Reverse 2-port transmission measurement.
Requires Opt 122.
S22 Reverse 1-port reflection measurement.
Requires Opt 122.
OR Press Trace 6then Num of Traces then select a
Multi-trace configuration. Learn more on page 6.
3. Press Freq/Dist then either Start and Stop or
Center and Span to enter a frequency range for the
measurement.
4. Press BW 2then IFBW to select the IF Bandwidth
for the measurement. Narrower bandwidths require
more time to sweep.
5. Press Sweep 3then Resolution to select the
number of data points for the measurement. More
data points requires more time to sweep.
6. Press Cal 5to calibrate the measurement. See page
8 to learn more.
Continued on following page…
5
Measure S-Parameters (NA Mode)
…continued
The following NA Mode settings can be made before or
after calibrating without affecting measurement
accuracy.
Press Scale/Amptd to change scale.
Autoscale Adjusts the Y-axis to comfortably fit
the Min and Max amplitude of the active trace.
Autoscale All Autoscales all of the traces on
the screen. Useful for multi-trace configurations.
Scale Manually enter a scale per division to view
specific areas of the trace.
Ref Level Manually set the value of the
reference line.
Ref Position Manually set the position of the
reference line. Values must be between 0 (TOP
line) and 10 (BOTTOM line)
Press Measure 1then Format to change the
format for the measurement.
Press BW 2then Averaqe then enter a value for
the number of trace sweeps to average.
Press Marker then enter a value to move the marker
to the X-axis position of interest.
Press Limit 8then Edit or Recall Limits to test
measurement results against limit lines.
6
Multi-Trace Configurations (NA Mode)
You can display multiple traces on the FieldFox screen.
The above image shows a 3-trace configuration. Tr1 is
the ACTIVE trace as indicated by the highlighted Tr1
annotation in the upper left corner.
The Frequency Range, IF BW, Resolution, and Output
power is common to all traces. All trace settings, such as
format, markers, and limit lines, are applied to the
ACTIVE trace in the same manner as when a single trace
is present.
To select a multi-trace configuration:
Press Trace 6 then Num Traces
Then choose a multi-trace configuration.
To activate a trace in order to change a setting:
Use the ▲|▼ arrows to scroll through the traces -
OR
Press Trace 6 then select Trace 1, Trace 2,
Trace 3, or Trace 4, Only traces that are shown can
be activated.
By default with Multi-trace configurations, Markers that
are applied to one trace are applied to ALL traces.
7
Measure DTF (CAT Mode-Opt 305)
Required Equipment:
LOAD with correct connector type and gender to
terminate the end of the DUT.
Known length and cable type or Cable Loss
(dB/Meter) and velocity factor of the DUT.
Optional phase stable jumper cable or adapter to
connect the beginning of the DUT to the FieldFox.
1. Connect any necessary jumper cable or adapter to the
FieldFox Port 1 connector.
2. Press Preset then Preset
3. Then Mode then CAT
4. Then Distance to Fault
5. Press Freq/Dist then Stop Distance and enter the
length of the DUT.
6. If a diplexer or other filter is in the measurement path,
press Freq/Dist and manually type the Min Start
and Max Stop frequencies. Otherwise, press Meas
Setup then select Frequency Mode [Lowpass]
7. Press Cal 5and follow the Cal prompts.
8. Disconnect any components or antenna that should
NOT be measured and connect a LOAD at the end of
the DUT.
9. Press Meas Setup 4then DTF Cable
Specifications.
10.Either press Recall Coax Cable or enter the
Velocity Factor and Cable Loss of the DUT.
11.Connect the start end of the DUT to the FieldFox Port
1. The DTF measurement is displayed.
8
Measure Cable Loss (1-Port) CAT Mode-
Opt 305
Required Equipment:
LOAD with correct connector type and gender to
terminate the end of the DUT.
Optional phase stable jumper cable or adapter to
connect the beginning of the DUT to the FieldFox.
1. Press Preset then Preset
2. Then Mode then CAT
3. Then More then Cable Loss (1-Port)
4. Connect the DUT.
5. Press Freq/Dist and enter Start and Stop
frequency values of the measurement.
6. Press Sweep 3then Min Swp Time Increase the
sweep time until a stable trace is visible.
7. Press Cal 5then follow the calibration prompts.
8. Connect the DUT (cable to be tested) to the FieldFox
and connect a LOAD at the end of the DUT.
Depending on the DUT, the following three steps may
improve the amount of ripple that is visible on the screen.
9. Press Trace 6 then Data->Mem.
10.Remove the LOAD and leave the end of the DUT
open.
11.Press Data Math then Data –Mem. Use Averaging
for high-loss measurements. Press BW 2then
Averaging
12.Read Avg Cable Loss on the FieldFox screen.
9
Calibration
Calibration is performed in NA, CAT, and VVM Modes.
A CalReady calibration is automatically applied to
measurements when the FieldFox is powered ON and
when Preset. This calibration sets the reference plane at
the test port connectors.
Calibration should be performed when any of the
following occur:
The temperature changes significantly.
The Frequency Range, Resolution, Min Swp Time, or
Power Level is changed.
When using a phase stable jumper cable or adapter
to connect the DUT to the FieldFox. These should be
high-quality components.
After making measurement settings:
Press Cal 5then follow the prompts.
For highest accuracy with minimum connections for
your setup, perform the Calibration Type that is
recommended by the FieldFox.
During a QuickCal, press Skip Load when NOT
using a jumper cable or adapter.
Cal Rdy is shown on the screen when CalReady is
correcting the measurement.
Cal ON Q is shown on the screen when a QuickCal is
correcting the measurement.
CAL ON U is shown on the screen when a Response Cal
or Mechanical Cal is correcting the measurement.
When a calibration is being interpolated, an asterisk is
added to the screen annotation as follows:
Cal ON Q* or CAL ON U*
10
Power Meter Mode –Option 302
Power Meter measurements are made using a Keysight
USB Power Sensor.
For a complete list of supported Keysight USB Power
Sensors, visit: www.keysight.com/find/usbsensorsforfieldfox
Damage levels are:
+25 dBm (320 mW) average
+33 dBm peak (2 W) <10μs
+5V
Use an Attenuator between the DUT and the power
sensor when measuring power levels that are higher than
+20 dBm. The attenuator value can be subtracted from
the measurement using Offset as follows:
Select Offset
Press Scale / Amptd then Offset On Off
Then Offset Val Enter a value by which the power
meter display is offset. A positive value compensates
for a component with loss, such as an attenuator.
Zeroing
The Keysight USB Power Sensors perform internal
zeroing automatically. Internal zeroing does NOT require
that the power source be turned OFF.
Perform external zeroing when measuring power levels
below -30 dBm. During external zeroing, the power
source MUST either be turned OFF or the power sensor
be disconnected from the DUT.
Press Cal 5
Then External Zero
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