BIRD 4029 User manual

INSTRUCTION BOOK
FOR
MODEL 4029
POWER SENSOR CALIBRATOR
POWER SENSOR
M>DEL 1029
BiiVQ
Electronic Corporation
30303 Aurora Road, Cleveland, Ohio 44139-2794
©Copyright 1988 by Bird Electronic Corporation

TABLE OF CONTENTS
Par.
1-1
1-3
1-5
1-0
1-7
1-9
2-1
2-3
2-5
2-7
2-9
2-11
2-13
2-15
3-1
3-3
4-1
4-3
4-5
4-7
4-9
4-11
4-13
4-15
4-17
4-19
4-21
4-23
4-25
4-27
SAFETY PRECAUTIONS
INTRODUCTION
Purpose and Function .................
Capabilities .........................
SECTION I—DESCRIPTION
General ............................
Enclosure ..........................
Front Panel .........................
Rear Panel ..........................
Internal Description ...................
Dip Switch
SECTION SI —INSTALLATION
General
Unpacking and Inspection ..............
Installation ..........................
Line Voltage Connections ..............
European Style Connectors .............
Serial CRT Terminal Connections ........
Communication Data Format Set Up ......
Power Sensor Calibration Set Up ........
SECTION III —THEORY OF OPERATION
General ............................
Block Diagram Description .............
SECTION IV —OPERATING INSTRUCTIONS
General ............................
Controls ............................
Calibration Set-Up ....................
Warm-Up Period .....................
Calibration Power Level ................
Calibration Frequencies ................
Power Sensor Calibration ..............
Power On Procedure ..................
Power Up Display ....................
Selecting the Calibration Direction
Viewing the Current Calibration Points
Adding aNew Calibration Point
Deleting One Calibration Point
Removing All Calibration Points
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4029

MODEL 4029 POWER SENSOR CALIBRATOR
INTRODUCTION
PURPOSE AND FUNCTION
This manual provides the information required for op-
erating and maintaining the Bird Electronic Corpo-
ration Model 4029 Power Sensor Calibrator. It also
serves as aguideline for calibrating 4020 series
power sensors. Throughout this manual the Model
4029 will be referred to as the calibrator.
CAPABILITIES
The calibrator is an accessory for the 4420 series of
Power Meters. It is amicroprocessor-based instru-
ment that is used for calibrating the 4020 Series RF
Power Sensors. Each power sensor contains up to
forty calibration factor vs. frequency points stored in
non-volatile memory. The calibrator and an external
CRT terminal (not supplied) provides access to the
power sensor memory in order to add or delete in-
dividual calibration points, clear all calibration points,
or simply list calibration points for review. The spec-
ifications for the calibrator are listed in Table 1-1.
TABLE 1-1. SPECIFICATIONS FOR MODEL 4029
POWER SENSOR CALIBRATOR
Calibration Transfer
Accuracy ±2% of RF Power Standard Accuracy
Communications
Baud Rates Selectable. 50, 75, 110, 135, 150, 300,
600, 1200, 1800, 2400, 3600, 4800,
7200, 9600, and 19200 Baud.
Data Format Asynchronous. 5, 6, 7, or 8data bits,
1or 2stop bits selectable.
Data Code ASCII Standard
AC Power 115 or 230 Vac +10%, 45-66Hz. 9.0
Va.
Fuse SAG 0.1 5A 250V
EMI Compliance Exceeds FCC Class Arequirements
for computing devices. (Both radiated
and conducted emission.)
Temperature Range
Operating
Storage +20°C to +30°C (68° Fto 86°F)
-10°C to +70°C (14°F to 158°F)
Dimensions 105/i6"Lx10V8"Wx4V4"D
(262mm x257mm x108mm)
Weight 5V4 lb. (2.4kg)
ADDITIONAL EQUIPMENT REQUIRED BUT NOT
SUPPLIED
a. Serial CRT Terminal —Aserial terminal is used
to transfer information between the calibrator and
the user. It must be compatible with an RS-232
format for standard communications of ASCII
coded data. The calibrator has selectable data for-
mat and baud rates to match most serial termi-
nals. (Refer to Table 2-1). All data is displayed in
astandard 24 lines by 80 columns format. Most
personal computers can be configured as a serial
terminal. Appendix Acontains aprogram that al-
lows an IBM PC computer to be used as ater-
minal.
b. RF Power Source —ARF Power Source provides
the reference power level to the power sensor
during calibration. It must be capable of producing
stable CW power into 50 ohms at all of the cali-
brating frequencies. Each harmonic of the RF sig-
nal must be at least 50 db less than the
fundamental signal. Any residual amplitude mod-
ulation must be less than 0.5%. The above re-
quirements can be easily achieved by using a
combination of asignal generator and abroad
band power amplifier with proper filtering.
c. RF Power Meter Standard The power meter
standard is used to accurately measure the CW
power applied to the power sensor during cali-
bration. The calibrator transfers the accuracy of
the power meter standard to the power sensor.
The accuracy of final calibration is highly depend-
ent on the accuracy of the power meter standard.
Aside from being accurate, it must also be able to
operate over the frequency range and power level
of the RF power source. Input SWR should be low
to keep mismatch errors to aminimum.
d. Serial Communication Cable —A25 conductor
serial communications cable is used to connect
the calibrator to the serial CRT terminal. The cal-
ibrator end should be serviced with aStandard
DB25 (25 pin male “D”) connector. The terminal
end should be serviced with aconnector to mate
with the serial output port of your terminal. Con-
sult your terminal manual for the correct connec-
tor configuration. Bird Electronic Corporation
offers two different lengths of cable assemblies
for use with the calibrator (P/N 5-1662-1, 5feet
or 5-1662-2, 10 feet).
The following equipment is required to calibrate 4020
Series RF Power Sensors but is not supplied with
the calibrator.
-1-
4029

1-5. FRONT PANEL
The front panel features of the calibrator are shown
in Figure 1-2. The following is adescription of the
connectors, controls and indicator lamps.
a. AC ON/OFF Switch —The front panel AG ON/
OFF switch controls the AC line power to the cal-
ibrator circuits.
b. AC Lamp —This red lamp will light to indicate
that AC power is being applied to the calibrator
circuits.
c. CAL ENABLE/STANDBY Switch —Changes in
Power Sensor calibration are prevented when this
switch is in the STANDBY position. During power
sensor calibration, the switch is placed in the CAL
ENABLE position.
d. CAL ENABLE Lamp —The green CAL ENABLE
lamp lights when the CAL ENABLE/STANDBY
switch is in the CAL ENABLE position. This pro-
vides avisual indication that the calibrator is able
to make changes in the power sensor calibration
data.
e. POWER SENSOR Connector —The latch-n-
lock power sensor connector provides ameans for
connecting the calibrator to the power sensor un-
der test. This connection is made using the sensor
cable (P/N 4421-038)
FIGURE 1-2. FRONT PANEL LAYOUT.
POWER SENSOR CALIBRATOR
MODEL 4029
POWER SENSOR
STANDBY
Q
CAL
ENABLE
gOFF |
ON
AC
Oliva GnporatlQii
1-6. REAR PANEL
The rear panel features of the calibrator are shown
in Figure 1-3. The following is adescription of the
major components on the rear panel.
a. AC Line Module —The AC line module contains
the line socket for input of AC power. It also houses
the line voltage selector and the AC line fuse. De-
tailed instructions for selecting the proper line volt-
age and changing the AC fuse are contained in the
installation section.
b. RS-232 Terminal Connector —This 25 pin “D”
type connector provides for connection of the se-
rial terminal to the calibrator. The pin assignments,
physical parameters and electrical specifications
meet the RS-232 interface standard of data com-
munications. The pins which are used by the cal-
ibrator appear in Table 1-1. In cases where the
terminal employs aslightly different wiring arrange-
ment, no attempt should be made to rewire this
connector. Bird offers anull modem kit, P/N 4380-
250 which can be used to rearrange the lines sep-
arate from the calibrator.
4029
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2-9. EUROPEAN STYLE CONNECTORS
2-10. To make the ac power cord compatible with
European style sockets, the user must replace the
connector at the end of the power cord. Then set the
voltage selector drum for 230 Vac operation.
2-1 1.SERIAL CRT TERMINAL CONNECTIONS
2-12. The serial terminal is connected to the cali-
brator through a25 pin conductor cable equipped
with DB25 connectors. These cables can be pur-
chased from Bird in one of two lengths (P/N 5-1662-
1,5feet or 5-1 662-2, 10feet). Two screws are located
on each connector to ensure that the connections
remain secure. The following procedure explains
how to connect aserial CRT terminal to the calibrator.
a. Line up the cable connector with the RS-232
Terminal connector located on the rear panel of
the calibrator. The connector is designed so that
it will fit only one way.
b. Tighten the connector screws securely. Do not
overtighten.
c. Line up the cable connector with the serial port
on the terminal. Most terminals are equipped for
use with DB25 style connectors. Consult the in-
struction manual for your terminal for the proper
connecting method.
d. Tighten the connector screws securely. Do not
overtighten.
2-13. COMMUNICATION DATA FORMAT SET-UP
2-14. Inside the calibrator are DIP switches that
control the data format and baud rate of the serial
communication. These switches are factory set for
9600 baud, 8data bits, and 1stop bit. For proper
operation, the switches must be set to match the data
format and baud rate of the user’s terminal. The fol-
lowing procedure explains how to set these switches.
WARNING
The potential for electrical shock exists. Al-
ways unplug the calibrator from the ac line
before removing its cover.
a. Remove the four screws that secure the top
cover to the calibrator. Remove the top cover by
pulling straight up.
b. Locate the DIP switch, S3 and the DTE/DCE
switch, S2 (see Figure 2-2).
c. The proper switch settings for use with your
terminal can be found in Table 2-1. Use apencil
or similar object to place the switches in their cor-
rect positions.
d. Determine whether the terminal is operating as
Data Terminal Equipment (DTE) or Data Commu-
nication Equipment (DCE). If the terminal is data
terminal equipment, place the toggle switch, S3, in
the DCE position. The toggle switch should be
placed in the DTE position if the terminal is data
communications equipment.
e. Install the top cover onto the calibrator. Secure
with four screws.
FIGURE 2-2. DATA FORMAT SWITCHES.
4029
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SECTION IV —OPERATING INSTRUC-
TIONS
4-1. GENERAL
4-2, This section details the proper method of op-
erating the Model 4029 Power Sensor Calibrator, It
can also be used as aguideline for calibrating 4020
series power sensors. Step by step examples of
power sensor calibration are used to demonstrate
operation of the calibrator.
4-3. CONTROLS
4-4. The calibrator has two front panel controls
that are used during it’s operation. The ON/OFF
switch controls the application of ac line power to
the calibrator circuits. The CAL ENABLE/STANDBY
switch provides astandby mode in which power sen-
sor calibration can be viewed without accidentally
changing the stored data. Therefore, the GAL ENA-
BLE mode must be selected to make changes to the
power sensor calibration data.
4-5, CALIBRATION SET-UP
4-6. Acomplete procedure for power sensor cal-
ibration set up is detailed in Paragraph 2-15 of the
Installation Section.
4-7. WARM-UP PERIOD
4-8. The calibrator does not require awarm up
period. It will function properly as soon as it is
switched on. However, the Series 4020 Power Sen-
sors must be at astabilized ambient room temper-
ature for at least one hour prior to calibrating.
4-9, CALIBRATION POWER LEVEL
CAUTION
Do not apply RF power to the power sensor
which exceeds 120% of full scale of the highest
range.
4-10. The Series 4020 Power Sensors are capable
of being calibrated at any power level within their
operating power range. This is due to the linear de-
tection scheme used in the power sensors. The cal-
ibration power level of ten watts will be used for the
examples in this section. Regardless of which power
level is used, it is important to ensure that the cali-
bration power is stable.
4-1 1.CALIBRATION FREQUENCIES
4-12. Acalibration point can be added at any fre-
quency within the limits of the power sensor’s band-
width. However, to maintain the specified accuracy,
Bird recommends calibrating power sensors at the
frequencies listed in Table 4-1. These frequencies
have been selected to ensure minimum interpolation
errors between calibration points.
TABLE 4-1. RECOMMENDED CALIBRATION
FREQUENCIES.
Model 4021 Model 4022 Model 4024
1.8 MHz 25 MHz 1.5 MHz
2.0 MHz 30 MHz 1.8 MHz
2.5 MHz 40 MHz 7.0 MHz
3.2 MHz 50 MHz 7.5 MHz
4.0 MHz 70 MHz 3.2 MHz
5.0 MHz 90 MHz 4.0 MHz
6.3 MHz 150 MHz 5.0 MHz
7.9 MHz 270 MHz 6.3 MHz
10.0 MHz 400 MHz 7.9 MHz
13.0 MHz 500 MHz 10.0 MHz
16.0 MHz 600 MHz 13.56 MHz
20.0 MHz 710 MHz 16.0 MHz
25.0 MHz 750 MHz 20.0 MHz
32.0 MHz 800 MHz
900 MHz
950 MHz
1000 MHz
25.0 MHz
32.0 MHz
4-13. POWER SENSOR CALIBRATION
NOTE: Bird Electronic Corporation cannot guarantee
the accuracy of Series 4020 Power Sensors that have
been calibrated at other than factory authorized serv-
ice centers. Therefore, using the 4029 to change
power sensor calibration will void the power sensor
calibration warranty.
4-14. The following examples of power sensor cal-
ibration are used to demonstrate operation of the
calibrator. The related figures are used to illustrate
the menu and prompts that are displayed on the ter-
minal CRT.
4-15. POWER ON PROCEDURE
4-16. Set up of the calibrator is described in in-
stallation Seetion II. Be sure that the voltage selector
drum in the ac line module is set to match the avail-
able line voltage. Set the CAL ENABLE/STANDBY
switch to the STANDBY position. Place the ON/OFF
switch to the on position. The red ac lamp should
light to show that the calibrator is on. If the lamp does
not light, refer to the maintenance section for pos-
sible faults.
4029
-11 -

4-21. VIEWING THE CURRENT CALIBRATION
POINTS
4-22. The calibration factors stored in the power
sensor can be viewed by using the “Display current
calibration points.” function. To view the calibration
data, enter the number “3” followed by RETURN. Fig-
ure 4-2 shows atypical display of calibration points
for aModel 4021 Power Sensor. The DIRECTION
indicator shows that these calibration points are in
the reflected calibration memory. The current fre-
quency is displayed in the upper right hand corner
of the screen. Calibration points are numbered 1thru
20 in ascending order of RF frequency. If anew point
is added it will be fit into the table according to its
frequency and all other points will be renumbered. If
apoint is removed, the remaining higher frequency
points will each decrease in point number by one.
The frequency column indicates the RF frequency (in
MHz) that was measured by the power sensor at
each calibration point. The Low Factor, High Factor
columns lists the actual calibration factors that are
used to correct the power measurement. It should
be noted that the High Factors in the Model 4021 and
4024 Power Sensors will always be 1.00. To return
to the menu, press the RETURN key.
FIGURE 4-2. DISPLAYING CURRENT CALIBRATION POINTS.
4029
-13 -

4-25. DELETING ONE CALIBRATION POINT
4-26. It sometimes becomes necessary to remove
the calibration point at one frequency. This can be
performed using the “Delete one calibration point.”
function. An example of this procedure is explained
below and illustrated in Figure 4-4. Let us assume
that the calibration point at 25MHz was found to be
incorrect. This point must be removed before adding
anew 25MHz calibration point. First, the calibration
point number at 25MHz must be determined. This is
done using the “Display current calibration points.”
function. (See Paragraph 4-21). Once the point num-
ber is found, select the “Delete one calibration point.”
function. The display prompts you to enter the num-
ber of the calibration point to be deleted. Enter the
point number that corresponds to the 25MHz cali-
bration point and press the RETURN key. The display
will indicate “Calibration point number Xhas been
removed." Use the “Display current calibration points”
function to verify that the point has been removed.
To return to the menu without removing acalibration
point, simply press the RETURN key without entering
apoint number.
FIGURE 4-4. REMOVING ONE CALIBRATION POINT.
Direction: REFLECTED
1. Select Forward power calibration. 4. Add anew calibration point.
2. Select Reflected power calibration. 5. Delete one calibration point.
3. Display current calibration points. 6., Delete all calibration points.
Enter onumber followed by RETURN to choose one of the above: 5
To remove apoint from the REFLECTED calibration table,
enter the point number (not the frequency) from the
keyboard and press RETURN. If you want to return
to the main menu without removing acalibration point
press RETURN without entering anumber.
Enter number :13
Calibration point number 13 has been removed.
4029
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