Berkeley Varitronics Systems YellowFrog 2 Manuel utilisateur

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Wideband Manual Version 1.5

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1. Introduction ...................................................................................................................................2

2. System Requirements ....................................................................................................................3

3. Yellow Frog 2 Power Meter Quick Start Guide..............................................................................3

4. Yellow Frog 2 PC Software Installation.........................................................................................5

Unit Properties..................................................................................................................................5

5. Unit Operation...............................................................................................................................5

Connections ......................................................................................................................................6

Initialization......................................................................................................................................6

Setup ................................................................................................................................................7

Data Logging – ASCII Output File ...................................................................................................7

6. Specifications ................................................................................................................................8

7. Appendix 1: USB Port Driver Installation......................................................................................9

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1. Introduction

The Yellow Frog 2 (YF2) Power Meter measures true RMS power over the frequency range of 150

MHz to 2700 MHz for purely sinusoidal (CW) as well as GSM, CDMA and W-CDMA carrier signals.

The measurable power range is 15dBm to 50dBm. It has a 0.1dB resolution and an accuracy of 0.5dB.

When its output port is terminated by a 50 Ohm impedance, the value of the VSWR observed on its

input port is 1.20 or smaller. It has an LCD display displaying the measured power level in Watts or

dBm, the battery status and three LED indicators. The YF2 can be used either in stand-alone mode or

with a PC (desktop, laptop or notebook) via its USB port, for convenient data output in ASCII format.

The interface software and USB drivers provided with the unit are supported by Windows 7, Vista, XP

or 2000 Operating Systems.

The YF2 package comes with the following items:

1. YF2 Power Meter unit

2. AC charger for Li-Ion battery

3. CD-ROM disc containing PC Software and Driver (not shown)

4. USB cable (not shown)

5. Type N (M-M) adaptor

6. Pelican Carrying Case with foam protection

7. YF2 Power Meter User Manual (not shown)

8. Calibration certificate (not shown)

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2. System Requirements

The YF2 software will function with the following minimal configuration:

32 bit Windows 7 , Vista, XP or 2000 Operating System running on a PC.

USB port

3MB of available storage space on the hard disk.

3. Yellow Frog 2 Power Meter Quick Start

Guide

To Set-Up the YF2 power meter, do the following:

1. Install the YF2 Power Meter software on your PC (or, laptop/notebook), including the USB

driver(s) folder.

2. Connect the YF2 unit to the PC via the USB cable provided with the package and follow the

steps outlined in Appendix 1 for installing the USB driver on your computer.

3. Start the YF2 Power Meter software; the YF2 unit should be detected and connected within one

minute, as seen in the Yellow Frog 2 Power Meter window in Figure 1. When the unit is

connected, Connected to YellowFrog will be displayed to the right of “Unit Status”.

Firmware version, serial number, frequency range and unit status should be displayed in the

upper right compartment of the YF2 Power Meter window as seen in Figure 1:

Figure 1. Yellow Frog 2 Power Meter Window

4. If the YF2 unit is not detected within one minute, uninstall the driver, disconnect the unit and

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repeat steps 2 and 3.

5. Proceed with unit setup by entering: frequency (in MHz), power offset (, signal type and units

of measurement in the “UNIT SETUP” compartment of the user interface window and press the

“SET” button. Once set, these parameters will be “remembered” by the YF2 unit even if the

unit is turned OFF and ON again. The current values of these parameters will be displayed on

the lower right hand side compartment of the YF2 Power Meter window, as seen in Figure 1

above. To change them, enter new values by repeating this step.

6. Connect the YF2 unit input side (this is the side with the power switch and engraved serial

number of the YF2 unit) to the RF source and the output side (this is the side with the USB

port) to a 50 Ohm load or termination.

7. To start reading power level, click the “START REPORTING” button. This will result in the

flashing of the indicator ” Power Report ” in green background and the display of measured

power level in dBm and/or Watts next to the “Current Reading” label. The frequency and power

offset settings of the YF2 unit will also be displayed next to their respective labels. To stop

reading, press the “STOP REPORTING” button.

8. To record the measured data, left-click the “Browse” button at the bottom compartment in the

YF2 Power Meter window and create a “log” file in the desired directory by pressing “Save”

and checking the box in front of “Write to Current Log File” as seen in Figure 2 below. As long

as the “START REPORTING” button is pressed, the data will be recorded, accompanied by the

flashing of the label” Log” in green background. To stop recording (and/or reporting), press the

“STOP REPORTING” button.

Figure 2. Initiating the Log File for Recording Measured Data

NOTE:

When used with a PC (or laptop or notebook), the unit Power Switch does not have to be turned on,

because it will use power from the 5VDC supply available from the computer’s USB port. However,

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the user should periodically check the status of the unit’s Lithium-Ion battery by turning the Power

Switch ON; if the unit charging LED (next to the charging jack on the input side of unit) turns ON, the

battery has to be charged using the AC charger provided with the unit. Otherwise the battery does not

need charging.

4. Yellow Frog 2 PC Software Installation

Prior to the use of the YF2 via the USB interface with a computer, the following steps need to be

performed:

a) Copy the application software and the unit driver folder “YellowFrog2USBDrivers” (provided

on DVD medium) to the PC, preferably under the “C:\Program Files\YF2\” directory.

b) Install the unit USB port driver as shown in Appendix 1.

c) Run the application software

After step “c)”, the Yellow Frog 2 Power Meter window should display the window in Figure 1.

Unit Properties

The unit will display some of its properties in the top compartment of the YF2 Power

Meter window, as seen in Figure 1, repeated in Table 1 below:

Table 1. Unit Properties

Firmware Version V 2.0.1

Serial Number XXXXXX

Frequency Range 150 – 2700 MHz

Unit Status Connected to YellowFrog or Not Connected

Other important unit properties (not displayed in the window) are:

Measurement Resolution: 0.1dB steps

Measurement Accuracy: 0.5dB

5. Unit Operation

This section discusses the setup and operation of the YF2 unit in detail (for a quick start, the user is

referred to Section 3, “Yellow Frog 2 Quick Start Guide” above). It is assumed that the YF2 USB

driver has already been installed as described in Appendix1 below.

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Battery Maintenance Note

The only maintenance needed by the YF2 unit is periodic charging of the internal Lithium-Ion Polymer

battery whenever the red LED near the DC charging port (on the input side of the unit) turns on. After

charging adequately, this LED will turn off. If the unit is used without charging after the battery LED

turns on, eventually the message “LOBAT” will be displayed in the LCD. This message will disappear

when the battery is.

Connections

Connect the YF2 unit input side (this is the side with the power switch and engraved serial number of

the YF2 unit) to the RF source and the output side (this is the side with the USB port) to a 50 Ohm load

or termination. If the YF2 is used with a computer, the USB port on the YF2 is connected to the

computer USB port by the provided cable.

Initialization

The unit is initialized by turning on the power switch. After this, if an input signal is applied and the

output of the YF2 is properly terminated by a 50 Ohm load, the reading will be displayed on the LCD

and the units (dBm or Watt) are indicated by one of the LEDs to the right of the LCD. If the unit is set

to read in both units, then the two LEDs will alternate continuously as the measurements are made.

Setup

Start the YF2 Power Meter software. Enter the unit settings in the following order:

Frequency:

Enter in units of (MHz) either by scrolling the small triangles up/down or by directly entering a number

in the Frequency field.

Power Offset:

This field is used to enter the loss in the cable used to connect the input RF port of the unit to the signal

source, in multiples of 0.1 dB. If the loss is below 0.1 dB, enter “0”.

Signal Type (Optimize for Technology)

The unit will measure true RMS level for a pure sinusoid (CW) or a carrier modulated as a CDMA,

GSM or W-CDMA signal. Select one of the four types of signal under “Optimize for Technology”

Units (dBm or Watts)

Select one or both units. If one unit is selected, the reading is displayed steadily on the LCD, with the

corresponding LED steadily on. If both units are selected the LCD and the LEDs will alternate to

indicate both readings continuously.

After these parameters are selected, press the “SET” button under “UNIT SETUP”, to set the unit.

Once set, these parameter values will be “remembered” by the YF2 unit until they are changed again at

a later time. The current values of these parameters will be displayed on the lower right hand side

compartment of the YF2 Power Meter window, as seen in Figure 1 above. To change them, enter new

values by repeating this sequence. To start reading power level, click the “START REPORTING”

button. This will result in the flashing of the label Power Report in green background and the display

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of measured power level in dBm and/or Watts next to the “Current Reading” label. The frequency and

power offset settings of the YF2 unit will also be displayed next to their respective labels. To stop

reading, press the “STOP REPORTING” button. This will resume the steady label Power Report in

black background

Data Logging – ASCII Output File

While the unit is set up for making measurements (ie, “START REPORTING” button pressed) the

measured data may be recorded by left-clicking the “Browse” button at the bottom compartment in the

YF2 Power Meter window for creating a “log” file in the desired directory by pressing “Save” and

checking the box in front of “Write to Current Log File” seen in Figure 2. As long as the “START

REPORTING” button is pressed, the data will be recorded, accompanied by the flashing of the label

button and the label will appear in black: Log. An example of the recorded Output File appears in

Figure 3:

Figure 2. A Sample of the Output File(ASCII)

The first line shows the data column headings in the following order:

Date

Time

Frequency

Power (dBm)

Power (Watts)

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Overflow/Underflow

When the power level is below 20dBm, the word “Underflow” will be recorded in the last column.

When the power level is above 50 dBm, the word “Overflow” will be recorded in the last column. The

output file has the default name “log.yfrg”. This is an ASCII file and can be opened and edited as a text

file.

6. Specifications

Measurement Resolution: 0.1dB

Measurement Accuracy: 0.5dB

Power Range Measurable: 15dBm - 50dBm

Frequency Range: 150 MHz to 2700 MHz

Maximum VSWR (with 50 Ohm termination): 1.20

Stability: Temperature compensated in the 0 to 65 degree Celsius range

Electrical Interfaces:

RF: Type N

Computer: USB

Battery Charge: DC Jack

Controls: Power Switch

Indicators:

Display: LCD

Battery Status: LED

(dBm) Reading Indicator: LED

(Watt) Reading Indicator: LED

Power Source: internal Lithium Ion Polymer or Computer USB port

Battery Run Time: 8 hours

Weight: 2 lbs.

Dimensions: 3”H x 3”W x 5”L

User Interface Software and USB Driver Support: Windows 7, Vista, XP & 2000 (32 bit)

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7. Appendix 1: USB Port Driver Installation

After the USB driver folder “YellowFrog2USBDrivers” is copied to the C:\Program Files\YF2\

directory, proceed as follows:

a) Connect the YF2 USB port to the PC USB port with the USB cable; the YF2 unit should be

detected by the PC and the “Found New Hardware Wizard” displayed as follows:

b) Select “Install from a list or specific location (Advanced)” as see below and click “Next”:

c) In the next window (see below) select “Search for the best driver in these locations” and check

the box “Include this location in the search” and click “Browse” to point to the folder where the

drivers are located and click on “Next”:

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