Agilent Technologies FieldFox N9923A Bedienungsanleitung

Agilent FieldFox

RF Vector Network

Analyzer

N9923A

Quick Reference

Guide

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

Manufacturing Part Number: N9923-90002

Print Date: February 19, 2010

Supersedes: None

©Agilent Technologies, Inc. 2010

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.

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).

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…

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 1 then 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.

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 6then 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 -

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.

Measure Distance to Fault (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.

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 6then 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.

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 (see NA Mode or

CAT Mode measurements):

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*

Power Meter Mode –Option 302

Power Meter measurements are made using the

Agilent U2000 Series USB Power Sensors.

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 Agilent 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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