Berkeley Varitronics Systems Butterfly Bedienungsanleitung

manual version 1.2

Butterfly

Page 1

Contents

BUTTERFLY OPERATION

GETTING STARTED...................................................................................................... 2

LED STATUS INDICATORS............................................................................................. 3

CONNECTION AND USE................................................................................................ 3

BATTERY REPLACEMENT............................................................................................... 3

STARTUP SCREEN...................................................................................................... 4

MAIN SELECT SCREEN................................................................................................. 4

2.4 GHZ BAR GRAPH................................................................................................... 4

2.4 GHZ LINE GRAPH................................................................................................... 5

5 GHZ BAR GRAPH...................................................................................................... 5

5 GHZ LINE GRAPH..................................................................................................... 6

UNIT DATA SCREEN..................................................................................................... 7

ADJUST CONTRAST SCREEN.......................................................................................... 7

CABLE LOSS SCREEN.................................................................................................. 7

BATTERY TIPS........................................................................................................... 8

NETWORKING BASICS.................................................................................................. 9

GLOSSARY OF ACRONYMS............................................................................................ 11

GENERAL SAFETY....................................................................................................... 12

ACCCESS POINT CONNECTOR GUIDE................................................................................ 14

BUTTERFLY DATA SHEET

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Butterfly™ is a low-cost, handheld power meter

designed specifically for 802.11b, a and b/g WLANs

in mind. The receiver attaches directly to any Access

Point or Network Interface Card with an SMA external

antenna connection. Butterfly™ measures both 2.4

GHz and 5 GHz frequency standards to verify power

levels from 0 to 30 dBm in 1.0 dB steps. Other features

include a built-in backlit display, simple keypad menu

navigation and removable, rechargeable Ni-MH batter-

ies for true portability.

GETTING STARTED

Butterfly is powered by 4 rechargable Ni-MH cells

and comes with 4 extra cells and a Ni-MH charger.

Replacement AA cells must have at least 1500 mAh

per cell. Ni-MH cells are recommended for best perfor-

mance from your Butterfly. See the charger’s instruc-

tions and battery tips in this manual for more informa-

tion. Butterfly may also be powered with it’s supplied

DC transformer for locations near an AC power outlet.

Butterfly’s display is a 128 x 64 blue, backlit LCD

capable of adjustable contrast.

Butterfly connects to access points through it’s SMA

male connector. An adapter kit is included to ensure

compatibility with many access points.

Butterfly is powered on and off through its green rocker

switch.

Butterfly operation is all done through the 4-button

keypad. The top and bottom buttons scroll through

menu options and set threshold levels. The left button

selects the highlighted menu option. The right button

returns to the previous screen.

At the top of the Butterfly rest the power switch and

antenna connector. The power switch is a simple two

way toggle switch. The antenna connector (middle) is

an SMA Female 50 ohm. The provided antenna easily

screws and unscrews from this connector. Be sure to

unscrew antenna when transporting the Butterfly.

LED STATUS INDICATORS

Power LED indicates when the unit is ON.

Measurement LED indicates when measuring (Bar or

Line graph screen). LED is OFF when in Select Screen

Low Battery indicates when the batteries need a charge

or replacement.

CONNECTION AND USE

Connect the AP to be tested using the supplied SMA

connection kit to the ButterFly RF input connector, the

SMA connector on the top of the ButterFly. Make sure

both the AP and the ButterFly are on If not already

displayed, select either the bar or line graph measure-

ment. If the current RF power indicated by the text

display in the lower left of the display is –40 dbm and

never changes, check the connection between the AP

and ButterFly. If RF power is indicated by this portion

of the display, but no bar or line is displayed, reduce

the threshold using the Down key until the display

becomes active.

BATTERY REPLACEMENT

When the battery low indicator comes on, the bat-

teries must be replaced or recharged. To remove the

batteries, disconnect the ButterFly RF input and turn

the power switch to the off position. Hold the Butterfly

with the bottom facing you, the SMA RF input facing

upward. Locate the tab on the battery cover and using

your finger, gently pull the tab toward the bottom of the

unit until the cover comes away from the unit. Remove

the batteries and replace, observing the battery polari-

ties marked on the plastic of the battery compartment.

Replace the battery cover by positioning the tab on the

bottom of the cover into the slot in the bottom of the

battery compartment. Push on the cover until the tab

on the top clicks back into position. The unit is now

ready to resume use.

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STARTUP SCREEN

Operation of the Butterfly is straightforward. Insert 4

fresh battery cells into removable pack. Close back up

and power on the Butterfly. The Butterfly will display

the STARTUP SCREEN followed by the MAIN MENU.

MAIN SELECT SCREEN

Use the UP/DOWN buttons to scroll through menu

selections. Push the LEFT button to make a selection

and push the RIGHT button to move back one previous

screen.

2.4 GHZ BAR GRAPH

This screen displays any 2.4 GHz access point’s out-

put in dBm using a horizontal graphical bar. When a

bar graph measurement is started, it will run until the

measurement is changed or the unit is turned off. The

last measurement selected is restored when the unit is

turned back on. The bar graph measurement continu-

ally monitors the RF input connected to unit. When a

packet is detected that is above the set threshold, a

bar is displayed whose length is proportional to the

measured signal strength of the packet. The threshold

is marked by the down arrow above the signal strength

bar. This packet threshold is adjusted by pressing the

UP and DOWN keys while the measurement is dis-

played.

The current signal strength is displayed in

text in the lower left corner of the screen. This signal

strength text is always updated, even if a packet is not

detected. The highest level measured when a packet

is detected is marked by the Up arrow and wavy line

Page 5

below signal strength bar. This indicator stays at the

position of the strongest packet signal until the mea-

surement is changed or restarted.

To view the current dBm value during either the bar

graph or line graph measurement in LARGE Characters,

press the enter key during the measurement. To return

to the graph screen, press the enter key again.

2.4 GHZ LINE GRAPH

This screen displays any 2.4 GHz (802.11b/g & 802.11

FHSS) access point’s output in dBm (vertical) graphing

power over time (hrozontal) in milliseconds (scrolling

from left to right). As with the bar graph when selected,

the line graph will run until changed or the unit is shut

off. If the unit is shut off while displaying a line graph

measurement, the line graph measurement will resume

when the unit is next turned on. The line graph mea-

surement (as the bar graph measurement) continually

monitors the RF input and displays this input when a

packet is detected that is greater then the threshold, in

this screen the threshold is displayed as a dotted line.

To adjust this threshold, press the UP and DOWN keys

while the measurement is displayed. The current RF

power measured during the line graph measurement is

displayed in text in the lower left corner of the display.

As in the Bar graph, this value is always updated, even

if a packet is not detected. For both the bar and line

graph measurements, if the total power displayed in

the lower left corner is changing but no bar or line is

displayed, reduce the packet detect threshold by press-

ing the DOWN key.

5 GHZ BAR GRAPH

This screen displays any 5 GHz access point’s output

in dBm using a horizontal graphical bar. When a bar

graph measurement is started, it will run until the

measurement is changed or the unit is turned off. The

last measurement selected is restored when the unit is

turned back on. The bar graph measurement continu-

ally monitors the RF input connected to unit. When a

packet is detected that is above the set threshold, a

bar is displayed whose length is proportional to the

measured signal strength of the packet. The threshold

is marked by the down arrow above the signal strength

bar. This packet threshold is adjusted by pressing the

UP and DOWN keys while the measurement is dis-

played.

The current signal strength is displayed in

text in the lower left corner of the screen. This signal

strength text is always updated, even if a packet is not

detected. The highest level measured when a packet

is detected is marked by the Up arrow and wavy line

below signal strength bar. This indicator stays at the

position of the strongest packet signal until the mea-

surement is changed or restarted.

5 GHZ LINE GRAPH

This screen displays any 5 GHz (802.11a) access

point’s output in dBm (vertical) graphing power over

time (hrozontal) in milliseconds (scrolling from left to

right). As with the bar graph when selected, the line

graph will run until changed or the unit is shut off. If

the unit is shut off while displaying a line graph mea-

surement, the line graph measurement will resume

when the unit is next turned on. The line graph mea-

surement (as the bar graph measurement) continually

monitors the RF input and displays this input when a

packet is detected that is greater then the threshold, in

this screen the threshold is displayed as a dotted line.

To adjust this threshold, press the UP and DOWN keys

while the measurement is displayed. The current RF

power measured during the line graph measurement is

displayed in text in the lower left corner of the display.

As in the Bar graph, this value is always updated, even

if a packet is not detected. For both the bar and line

graph measurements, if the total power displayed in

the lower left corner is changing but no bar or line is

displayed, reduce the packet detect threshold by press-

ing the DOWN key.

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Page 7

UNIT DATA SCREEN

This screen provides basic information about the

device including the owner, firmware version and

serial number.

ADJUST CONTRAST SCREEN

This screen provides contrast adjustment using the UP

and DOWN buttons to increase and decrease the LCD

screen contrast. Press ENTER (left button) or SELECT

(right button) to exit this screen.

CABLE LOSS

The Cable Loss selection can be used to compensate

for a known cable loss between –1 and –6 dB. Use the

UP and DOWN buttons to select the required cable loss

compensation and press the Enter key to use. Entering

a value of 0 dB for Cable Loss has no effect on the

ButterFly display. This is the shipped factory default

value.

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BATTERY TIPS

1. Ni-MH batteries do not charge to full capacity the first time they are charged.

2. Ni-MH batteries do not charge to full capacity the first time they are charged after a long period of inactivity. or after a long

period of non-use.

Cause:

When charging Ni-MH batteries for the first time after long-term storage, deactivation of reactants may lead to increased battery

voltage and decreased capacity, (which causes premature termination of charging). Because batteries are chemical products

involving internal chemical reactions, performance deteriorates with prolonged storage. This is normal in Ni-MH batteries.

Resolution:

Ni-MH batteries may not charge to full capacity the first time they are charged, or after a long period of inactivity.

The first-time charge of the Ni-MH Rechargeable Battery Pack should take approximately 2 hours. If the Receiver Dock light

turns green, indicating a full charge, in less than 2 hours, repeat the charge cycle as follows:

First-time Charge:

1. To begin charging, place the instrument on the Charge Dock. Refer to your instrument’s User Guide for details.

2. When the charge light turns green, remove the W-LAN Receiver from the dock and place back on the dock after several

seconds.

3. Repeat steps 1 and 2 three or four times or until the combined charge time is 2 hours.

Subsequent charges of the W-LAN Ni-MH Battery Pack will not require multiple charging cycles unless left uncharged for a long

period of time (greater than 2 months).

Networking Basics

Packets and traffic

Information travels across a network in chunks called “packets.” Each packet has a header that tells where

the packet is from and where it’s going, similar to what you write on the envelope when you send a letter.

The flow of all these packets on the network is called “traffic.”

Hardware addresses

Your PC “listens” to all of the traffic on its local network and selects the packets that belong to it by check-

ing for its hardware address in the packet header or MAC (Media Access Control). Every hardware product

used for networking is required to have a unique hardware address permanently embedded in it.

IP addresses

Since the Internet is a network of networks (connecting millions of computers), hardware addresses alone

are not enough to deliver information on the Internet. It would be impossible for your computer to find its

packets in all the world’s network traffic, and impossible for the Internet to move all traffic to every net-

work, your PC also has an IP (Internet Protocol) address that defines exactly where and in what network

it’s located. IP addresses ensure that your local Ethernet network only

receives the traffic intended for it. Like the hierarchical system used to define zip codes, street names,

and street numbers, IP addresses are created according to a set of rules, and their assignment is carefully

administered.

Put another way, the hardware address is like your name; it uniquely and permanently identifies you. But it

doesn’t offer any clues about your location, so it’s only helpful in a local setting. An IP address is like your

street address, which contains the information that helps letters and packages find your house.

Rules for Sending Information (Protocols)

A protocol is a set of rules that define how communication takes place. For instance, a networking proto-

col may define how information is formatted and addressed, just as there’s a standard way to address an

envelope when you send a letter.

Networking Devices:

Bridges

A bridge joins two networks at the hardware level. This means that as far as other protocols are concerned,

the two networks are the same.

Routers

A router connects two IP networks. In contrast to a bridge, which joins networks at the hardware level, a

router directs network IP traffic based on information stored in its routing tables. A routing table matches

IP addresses with hardware addresses. The router stamps each incoming IP packet with the hardware

address that corresponds to that IP address. As a result, the packet can be picked up by the right computer

on the hardware network.

DNS (Domain Name Server)

Networks (domains) on the Internet have names that correspond to their IP addresses. A Domain Name

Page 9

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