ME7220A
RADAR TEST SYSTEM
76-77 GHzOPERATION MANUAL

490 JARVIS DRIVE ¨ MORGAN HILL, CA 95037-2809

P/N: 10390-00001
REVISION: C
PRINTED: JULY 2003
COPYRIGHT 2002-2003 ANRITSU COMPANYWARRANTY
The ANRITSU product(s) listed on the title page is (are) warranted against defects inmaterials and workmanship for one year after acceptance of system.
ANRITSU’s obligation covers repairing or replacing products which prove to be defective
during the warranty period. Buyers shall prepay transportation charges for equipment
returned to ANRITSU for warranty repairs. Obligation is limited to the original purchaser.
ANRITSU is not liable for consequential damages.

LIMITATION OF WARRANTY
The foregoing warranty does not apply to ANRITSU connectors that have failed due tonormal wear. Also, the warranty does not apply to defects resulting from improper orinadequate maintenance by the Buyer, unauthorized modification or misuse, or operation
outside of the environmental specifications of the product. No other warranty is expressed or
implied, and the remedies provided herein are the Buyer’s sole and exclusive remedies.

NOTICEANRITSU Company has prepared this manual for use by ANRITSU Company personnel andcustomers as a guide for the proper installation, operation and maintenance of ANRITSU
Company equipment and computer programs. The drawings, specifications, and information
contained herein are the property of ANRITSU Company, and any unauthorized use or
disclosure of these drawings, specifications, and information is prohibited; they shall not be
reproduced, copied, or used in whole or in part as the basis for manufacture or sale of theequipment or software programs without the prior written consent of ANRITSU Company.

TRADEMARK ACKNOWLEDGMENTS
Visual Basic is a trademark of the Microsoft Corporation. Anritsu is a trademark of Anritsu
Company.

Safety Symbols
To prevent the risk of personal injury or loss related to equipment malfunction, ANRITSU Company uses thefollowing symbols to indicate safety-related information. For your own safety, please read the information
carefully BEFORE operating the equipment.

Symbols used in manuals
DANGER

This indicates a very dangerous procedure that could result in serious
injury or death if not performed properly.

WARNING

This indicates a hazardous procedure that could result in serious injury or death if not performed properly.

CAUTION

This indicates a hazardous procedure or danger that could result inlight-to-severe injury, or loss related to equipment malfunction, if
proper precautions are not taken.

Safety Symbols Used on Equipment and in Manuals(Some or all of the following five symbols may or may not be used on all ANRITSU equipment. In addition,
there may be other labels attached to products that are not shown in the diagrams in this manual.)
The following safety symbols are used inside or on the equipment near operation locations to provide information about safety items and operation precautions. Ensure that you clearly understand the meanings ofthe symbols and take the necessary precautions BEFORE operating the equipment.
This indicates a prohibited operation. The prohibited operation is indicated symbolically in or near the barred circle.
This indicates a compulsory safety precaution. The required operation
is indicated symbolically in or near the circle.
This indicates warning or caution. The contents are indicated symbolically in or near the triangle.
This indicates a note. The contents are described in the box.

These indicate that the marked part should be recycled.

ME7220A OM

Safety-1

For Safety
WARNING
Always refer to the operation manual when working near locations at which the alert mark, shown on the left, is attached. If theoperation, etc., is performed without heeding the advice in the operation manual, there is a risk of personal injury. In addition, theequipment performance may be reduced.
Moreover, this alert mark is sometimes used with other marks anddescriptions indicating other dangers.

WARNING
When supplying power to this equipment, connect the accessory
3-pin power cord to a 3-pin grounded power outlet. If a grounded
3-pin outlet is not available, use a conversion adapter and groundthe green wire, or connect the frame ground on the rear panel ofthe equipment to ground. If power is supplied without grounding
the equipment, there is a risk of receiving a severe or fatal electric
shock.

WARNING

RepairThis equipment can not be repaired by the operator. DO NOT attempt to remove the equipment covers or to disassemble internal
components. Only qualified service technicians with a knowledgeof electrical fire and shock hazards should service this equipment.
There are high-voltage parts in this equipment presenting a riskof severe injury or fatal electric shock to untrained personnel. In
addition, there is a risk of damage to precision internal components.

CAUTIONClass II Laser product. Do not stare into beam. Avoid long term
viewing of direct laser radiation. Power output <1 mW, wavelength = 600-700 nm.

Safety-2

ME7220A OM

Table of Contents
Chapter 1 - General Information
SCOPE OF THIS MANUAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Chapter 2 - Installation
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
REQUIRED EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
OPTIONAL EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
STANDARD EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
OPTIONAL EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Chapter 3 - Operation
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
DISPLAY MODULE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
HARD KEYS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
SOFT KEYS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
POWER ON PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
SYSTEM SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
SYSTEM CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
POWER MEASUREMENTS (Optional) . . . . . . . . . . . . . . . . . . . . . . . . 3-16
SPECTRAL MEASUREMENT (Optional) . . . . . . . . . . . . . . . . . . . . . . . 3-17
MEASUREMENT WITH NO RF SIGNAL . . . . . . . . . . . . . . . . . . . . . . 3-17
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17

ME7220A OMiChapter 4 - Remote Operation
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
CABLING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
SERIAL COMMUNICATION PARAMETERS . . . . . . . . . . . . . . . . . . . . . 4-1
ERROR CHECKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
PARAMETER VALIDATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
ENTERING REMOTE MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
EXITING REMOTE MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
CHANGES TO OPERATING PARAMETERS . . . . . . . . . . . . . . . . . . . . . 4-2
EEPROM WRITE CYCLE LIMITATION. . . . . . . . . . . . . . . . . . . . . . . . 4-2
SERIAL COMMANDS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
EXAMPLE CODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
Appendix A - Dimensional Drawings
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

ii

ME7220A OM

Chapter 1
General Information
1-1 SCOPE OF THISMANUAL

1-2 INTRODUCTION
1-3 DESCRIPTIONThis manual contains installation, operation and maintenance information for the ME7220A Radar Test System (RTS).

This chapter provides general information about the ME7220A Radar
Test System, including specifications and available options.

The ME7220A Radar Test System provides a simulated radar target response with one of two set target ranges (near and far) with an adjustabletarget Radar Cross Section (RCS). The signal response can be Doppler
shifted to simulate the speed of a moving target.
The system also allows the measurement at an IF frequency of the power
characteristics or Effective Isotropic Radiated Power (EIRP) of the transmitted radar signal as well as its spectral characteristics (bandwidth,
spurious signals, AM/FM Noise, etc.).

Figure 1-1.

ME7220A Radar Test System

ME7220A OM

1-1

ME7220A
OPERATION MANUALSPECIFICATIONS

1-4 SPECIFICATIONS
Table 1-1.

The ME7220A Radar Test System specifications are as follows:

System Specifications

GENERAL
Frequency Range

76 GHz to 77 GHz (other frequency range options available - contact
factory)

Antenna E-Field Polarization

Horizontal standard (other polarization options available)

Alignment Laser

Class II laser, 600-700nm, Output Power <1 mW
NOTE: Alignment laser shuts off above 40° C.

RADAR SIGNAL ANALYSIS
Received Radar Power(at RTS waveguide input flange)

0 dBm, maximum, for no damage–10 dBm, specifications below apply

Measured Radar PowerInternal meter(displays EIRP)

range: 30 dB, minimum
accuracy: ± 2 dB

External meter(displays IF power,
EIRP must be calculated)
Max. radar occupied frequency
Radar transmit frequency spectrum
External S.A. (displays IF signal)

range: 35 dB, minimum (50 dB typical with Option 5)
accuracy: ± 1 dB, including IF measurement and EIRP cal factor

Full band 76 to 77 GHz, translated to an IF band of 4.7 to 5.7 GHz

Accuracy of 76-77 GHz frequency measurement islimited by S.A. external reference and specifications

External S.A. using RTS
internal reference

Internal reference frequency accuracy 50 ppm

Internal Frequency Measurement

Accuracy of displayed frequency is ±50 MHz, maximum

Spurious Signals, In-Band

38 dBc, maximum, referenced to output signal

RTS TARGET SIMULATION
Received Radar Power(at RTS waveguide input flange)

0 dBm, maximum, for no damage–15 dBm, specifications below apply

Radar Signal Occupied Bandwidth

300 MHz maximum in the 76 to 77 GHz range

Number of Simultaneous Targets

1 (either near target or far target)

1-2

ME7220A OM

ME7220A
OPERATION MANUAL

Table 1-1.

SPECIFICATIONS

System Specifications continued

Target Distance
Near target
Far target

3.5 meters nominal (+ distance from RTS to radar)
116.5 meters nominal (+ distance from RTS to radar)(Other target distance options available - contact factory)

Distance Accuracy
Near Target
Far Target±0.5m maximum±2.0m maximum

Distance from RTS to DUT Radar

1.5 m, minimum

Radar Cross Section (RCS)Maximum RCS
RCS Adjustment Range
RCS Accuracy-4 dBsm, minimum (near target)
50 dBsm, minimum (far target)
50 dB, 1 dB steps± 0.75 dB ± 5% of attenuation, maximum,
measured at a single frequency of 76.5 GHz± 2.5dB, maximum, (measured over 76-77 GHz)

Target Speed Simulation (Doppler freq.)
Speed Range

0 to ± 250 km/h, minimum (0 to ± 35 kHz, minimum)

Speed Step Size

0.1 km/h, minimum (15 Hz minimum)

Speed Error

0.2 km/h, maximum (30 Hz maximum)

Doppler Carrier andSideband Suppression

40 dBc, minimum

Signal Characteristics
Spurious Signals and Responses

measured at waveguide output

In-Band Response

40 dBc, maximum

Out-of-Band
Local Oscillator signal
Image response–5 dBm, maximum (at 70.8 to 71.8 GHz)
–3 dBc, maximum (at 65.6 to 66.6 GHz)

RF Noise Density (CW)
Local Oscillator Phase
Noise
AM Noise for target
simulation

ME7220A OM–80 dBc/Hz @ 100kHz offset, maximum–130 dBm/Hz @ 2MHz offset, maximum

1-3ME7220A
OPERATION MANUALSPECIFICATIONS

Table 1-1.

System Specifications continued

DISPLAY MODULE
Display Screen

160x128 dot matrix monochrome LCD, with backlight

Cable from main module

1 meter

POWER REQUIREMENTS
Primary Power

85- 240 Volts AC
50-60 Hz
200VA, maximum

ENVIRONMENTAL
Operating Temperature Range+15° C to +35° C
0° C to +50° C, with reduced performance

Operating Humidity

5% to 95% at 40° C

Warm-Up Time

30 minutes, maximum for ambient +15 to +35° C

Storage Temperature–15° C to 75° C

EMC & Safety

Meets European community requirements for CE marking

SIZE AND WEIGHT
Dimensions
main module
display moduleH´W´D
197.6 ´ 485.6 ´ 553.6 mm
178.8 ´ 228 ´ 76.5 mm

Weightmain module
display module

10 kg
1 kg

FRONT PANEL CONNECTORS
Antenna Input/Output

WR12 Waveguide, 0 dBm maximum no damage

REAR PANEL CONNECTORSPower Meter PortN (F), 50W, 10 dBm maximum output

Spectrum Analyzer PortN (F), 50W, 10 dBm maximum output

10 MHz Reference Input

BNC (F), 50W, +15 dBm to –5 dBm, 25 VDC, max

RS-232 Serial PortD-Sub 9-pin (M)IF External Loop

2 SMA (F), 0 dBm maximum input/output

1-4

ME7220A OM

ME7220A
OPERATION MANUAL

1-5 OPTIONSOPTIONS

Options available for the ME7220A Radar Test System include:q

Option 1A ¾ Rack Mount Kit with handles

q

Option 2A ¾ Antenna Polarization, Verticalq

Option 2B ¾ Antenna Polarization, 45° slant leftq

Option 2C ¾ Antenna Polarization, 45° slant rightq

Option 3A ¾ Input/Output Port Waveguide Extensions, 5.08 cm(2.0 in.)q

Option 5 ¾ External Bandpass Filter for a Wider Dynamic Rangeat the Power Meter PortNOTES
If a system is ordered with Option 2x or 3x, the system will be calibrated with the external waveguides for that option
installed. Operating the system without those waveguides installed will result in inaccurate Range, RCS, andPower measurements. The error will be on the order of 5 cm in Range, and 0.35 dB in RCS and Power.
The waveguides of Option 2A, 2B, and 2C can be substituted for each other without introducing any error into themeasurement results.
Substituting the waveguides of Option 3A for any of the Option 2x waveguides, as opposed to not using any
waveguides, will limit the error in the measurements to less than 1.5 cm in Range, and to less than 0.08 dB in RCS
and Power.
Therefore, for systems with Option 2A, 2B, or 2C installed, if it is desired to operate the system with horizontal antenna polarization (no waveguide twist), replacing the installed waveguides with those from Option 3A will result inless error in the calibration data than if no waveguides are used at all.

ME7220A OM

1-5/1-6

Chapter 2
Installation
2-1 INTRODUCTION

This chapter provides information on the connection and installation of
the ME7220A Radar Test System.

2-2 REQUIRED EQUIPMENT The ME7220A Radar Test System is comprised of the following parts:qME7220A RTS Main moduleq

ME7220A RTS Display moduleq

Display interface cableq

Serial Interface Cableq

Horn antennas (2)qTermination, 50 Ohm, N (M)qPower cord

2-3 OPTIONAL EQUIPMENT The following optional equipment can be used with the system:

ME7220A OM

q

Anritsu Model ML2437A Power Meter or equivalentqAnritsu Model MA2472A Power Sensor or equivalentqAnritsu Model MS2663C Spectrum Analyzer or equivalent2-1

ME7220A
OPERATION MANUALINSTALLATION

2-4 INSTALLATIONThe RTS standard and optional components connect to the front and backpanels of the ME7220A Radar Test System. The front and back panels areshown in the figures below.

Figure 2-1.

ME7220A Radar Test System Front Panel

Figure 2-2.

ME7220A Radar Test System Rear Panel

2-2

ME7220A OM

ME7220A
OPERATION MANUALSTANDARD EQUIPMENT

2-5 STANDARD EQUIPMENT The following standard equipment is installed for all applications.
Display Module

Figure 2-3.

Connect the Display Interface Cable to the Display Module and thento the back panel of the RTS at the connector labeled DISPLAY PORT
(see Figure 2-3). Note that if the ME7220A is to be controlled throughremote operation (page 2-6) the Display Module need not be installed.

Display Port Connection

Antenna Horns

Using the four screws provided, connect each antenna horn to the
Front Panel of the RTS module at the connectors labeled ANTENNAPORTS (see Figure 2-4).

NOTE
Take care to properlyalign the rectangular
waveguide opening in
the horn with the rectangular waveguide opening in the front panel.

NOTE
For Options 2A, 2B, 2C,
and 3A, connect one endof the supplied waveguide to the antennahorn and the other end to
the Front Panel connector.

ME7220A OM

Figure 2-4.

Antenna Horn Connection

2-3

STANDARD EQUIPMENT

Power Cord

ME7220A
OPERATION MANUAL

Connect the power cord to the power supply module on the back panelof the RTS and to a grounded power outlet (85-240 VAC).

POWER CORD
CONNECTION

Figure 2-5.

Power Cord Connection

IF Input/Output Loop

The loop cable must be installed for system operation.

IF INPUT/OUTPUT LOOP

Figure 2-6.

2-4

IF Input/Output Loop

ME7220A OM

ME7220A
OPERATION MANUALOPTIONAL EQUIPMENT

2-6 OPTIONAL EQUIPMENT The following optional equipment may be installed as needed.
Power Meter

Connect an Anritsu MA2472A Power Sensor (or equivalent) to an
Anritsu ML2437A Power Meter (or equivalent) and then connect thesensor to the POWER METER PORT on the RTS back panel. When apower meter is connected, the SPECTRUM ANALYZER PORT must
be terminated with the 50W load provided.

POWER METERCONNECTOR

Figure 2-7.

Power Meter Connection

Spectrum Analyzer

Connect the Anritsu MS2663C Spectrum Analyzer (or equivalent) to
the SPECTRUM ANALYZER PORT on the RTS back panel. When aspectrum analyzer is connected, the POWER METER PORT must be
terminated with the 50W load provided.

SPECTRUM
ANALYZERCONNECTION

Figure 2-8.

Spectrum Analyzer Connection

ME7220A OM

2-5

ME7220A
OPERATION MANUALOPTIONAL EQUIPMENT

Although the RTS can supply an internal 10 MHz reference, for maximum accuracy connect the Anritsu MS2663C (or equivalent) Spectrum
Analyzer 10 MHz Reference Output to the 10 MHz REFERENCE INPUT on the RTS back panel. When a valid 10 MHz input signal is detected, the green LED next to the connector will be illuminated.

10 MHz REFERENCE INPUT

RS232 REMOTE OPERATION

Figure 2-9.

Spectrum Analyzer 10 MHz Reference Input and RS232 Remote Operation Connections

Remote Operation
NOTE
If the ME7220A is to becontrolled through remote operation, the Display Module (page 2-3)
need not be installed.

2-6

The ME7220A Radar Test System can be controlled by an external
computer via the RS232 serial port. Connect the serial cable provided
with the system to the RS232 SERIAL PORT connector on the RTS
back panel, and to the external computer serial port.
The display module (if installed) indicates when the Radar Test System is in remote operation mode. The keys on the display module will
not function while in remote operation mode.
Refer to Chapter 4, Remote Operation, for commands and programming information.

ME7220A OM

Chapter 3
Operation
3-1 INTRODUCTION
3-2 DISPLAY MODULE

This chapter provides instructions for operation and test setup of theME7220A Radar Test System.

The ME7220A Radar Test System display module menu-driven user interface is easy to use and requires little training. Five function softkeys
are located just below the display. The selection of a soft key brings upother soft key selection options for that function.
The keypad hard labeled keys adjacent to the display provide input forvarious menu options, and control system functions.

RANGE SPEED

Figure 3-1.

RCS

FREQ

SETUP

ME7220A Radar Test System Display Module

The following sections explain the operation of the hard and soft keys.

ME7220A OM

3-1

ME7220A
OPERATION MANUALHARD KEYS

3-3 HARD KEYSNOTE
At turn on, before any otherkey is pressed,
the Up/Downarrow keys
can be used toadjust the display contrast.
Press ENTER
to save thesetting.

The keypad keys adjacent to the display provide input for various menu
options, and control system functions. The following keypad hard key
functions are printed in black on the keypad keys.

0-9

These keys are used to enter numerical data as required to setup or perform measurements.

+/–

The plus/minus key is used to enter positive or negative values as required to setup or perform measurements.

·

The decimal point is used to enter decimal values as required to setup or
perform measurements.

ESCAPE
CLEAR

Exits the present operation or clears the display. If a parameter is beingedited, pressing this key will clear the value currently being entered andrestore the last valid entry. Pressing this key again will close the parameter. During normal operation, pressing this key will move up one menu
level.

UP/DOWN
ARROWS

The arrow keys can be used to move a selection indicator up or down, tostep through selection values, or increment a selection.

ENTER

Implements the current action or parameter selection.
The following keypad hard key functions are printed in blue on the keypad keys.

SAVE
SETUP

Saves the current system setup to 1 of 9 internal non-volatile memory locations. When the key is pressed, Save Setup appears on the display. Use
the number keys or the Up/Down arrow key to select a setup location andpress the ENTER key to implement.

RECALL
SETUP

Recalls a previously saved setup from memory location 0 through 9.
When the key is pressed, Recall Setup appears on the display. Select a
setup using the number keys or the Up/Down arrow key and press the
ENTER key to implement. Setup location 0 recalls the factory preset
state.
Turns the liquid crystal display (LCD) backlight ON or OFF for use in
low-level lighting environments.

3-2

FREQ
CAPTURE

Activates immediate capture of the frequency, rather than waiting for thepreset interval when the system is in automatic capture mode.

LASER
ON/OFF

When the laser is enabled through the SETUP function, this key turns
the laser on or off.

ME7220A OM

ME7220A
OPERATION MANUAL

3-4 SOFT KEYS

SOFT KEYS

The following figures show the various soft keys and provides informationon their operation.
Selecting a function soft key causes the key labels to change to the menu
of options for that function. Selecting a soft key option implements that
option, or brings up another menu of soft key selections specific to that
option. Pressing the BACK soft key returns to the previous menu.

RANGE

Figure 3-2.

RANGE

SPEED

RCS

FREQ

SETUP

Main Soft Key Labels

Set the simulated target range.
Selecting the RANGE soft key brings up the following options:

NEAR

Figure 3-3.

ME7220A OM

FAR

BACK

RANGE Soft Key Options

NEAR

Set the simulated target range to the NEAR target. The exact range
value of the near target is indicated on the display.

FAR

Set the simulated target range to the FAR target. The exact range valueof the far target is indicated on the display.

BACK

Return to the main menu.

3-3ME7220A
OPERATION MANUALSOFT KEYSSPEED

Set the speed and direction of the simulated target.
Selecting the SPEED soft key brings up the following options:

NOTE
A positive speed
corresponds to anegative Doppler
frequency offset.

EDIT

Figure 3-4.

3-4

+/-

RESET

STEP

BACK

SPEED Soft Key Options

EDIT

Press to edit the value of the speed using the keypad numbers or theup/down arrow keys. Speed can be varied from –250 km/h to +250 km/h
in steps of at least 0.1 km/h. The Doppler corresponding to the speed isalso displayed. The value of the speed can be positive (target movingaway) or negative (target moving towards). The value of the speed set isindicated in the display. The corresponding value of the Doppler frequency offset is also indicated in the display. Press ENTER to implement
the selection.

+/-

Toggles the set value of the speed between positive (target moving awayfrom the RTS) and negative (target moving towards the RTS).

RESET

Press to reset the value and sign of the speed to the factory default.

STEP

Press to change the default setting of the size that the up/down arrow
keys use to adjust the speed.

BACK

Return to the main menu.

ME7220A OM

ME7220A
OPERATION MANUALRCSSOFT KEYS

Set the Radar Cross Section (RCS) of the simulated target.
Selecting the RCS soft key brings up the following options:

EDIT

Figure 3-5.

EDIT

RESET

STEP

BACK

RCS Soft Key Options

Press to edit the value of the attenuator that determines the value of the
RCS, using the keypad numbers or the up/down arrow keys. For 0 dB attenuation, the target has a fixed maximum RCS value. The RCS attenuator can be varied from 0 to 50 dB to simulate different size targets.
The RCS is displayed in dBsm in the RCS display area, and in sqm (orsqft) in the edit display area. The attenuator adjusts in nominal 1 dBsteps. The value of the RCS is dependent on the simulated target range
as well as on the distance between the radar and the RTS.

ME7220A OM

RESETReset the value of the attenuator (and RCS) to the factory default.

STEP

Press to change the step value of the Up/Down Arrow key. Select 1 to 50
dB per step in steps of 1 dB. The default value is 1 dB.

BACK

Return to the main menu.

3-5ME7220A
OPERATION MANUALSOFT KEYS

FREQ

Sets the mode the RTS uses to capture the signal frequency of the radar
under test.
Selecting the FREQ soft key brings up the following options:

AUTO

Figure 3-6.

AUTO
NOTE
The FREQ CAPTURE
key will initiate an immediate capture of the frequency, rather than waiting for the preset interval
when the system is in automatic capture mode.

BACK

FREQ Soft Key Options

Automatic Capture Mode. In this mode, the RTS will automatically capture the center frequency of the radar transmitted signal and set the RTS
to operate at that frequency. This automatic capture will repeat every set
interval or whenever the FREQ CAPTURE button (page 3-2) is pressed.
The message FREQUENCY ACQUISITION IN PROGRESS will display at
the top of the screen when a frequency capture is occurring.
Selecting the AUTO soft key from the FREQ menu brings up the following
options:

INTRVL

Figure 3-7.

3-6

MANUAL

DELAY

RESET

BACK

AUTO Soft Key Options

INTRVL

Press to set the interval time between every automatic capture scan. Use
the number keys or the Up/Down arrow key to enter 1 to 9999 seconds.
Press the ENTER key to implement. The default is 60 seconds.

DELAY

Adjust the time delay (or dwelling time at each frequency point) that isused during the automatic capture scan. A longer delay is equivalent tohigher averaging of the signal. Use the number keys or the Up/Down arrow key to enter 1 to 800 ms. Press the ENTER key to implement. The default is 10 ms.

RESET

Press to reset the INTERVAL and DELAY parameters to their factory default values.

BACK

Press to go back to the FREQ menu.

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ME7220A
OPERATION MANUALMANUAL

SOFT KEYS

Sets the mode to Manual Frequency Setting. In this mode, the user manually inputs the value of the radar signal frequency.
Selecting the MANUAL soft key from the FREQ menu brings up the following options:

RDR CF

Figure 3-8.

ME7220A OM

BACKMANUAL Soft Key Options

RDR CF

Press to adjust the value of the radar signal Center Frequency

BACK

Press to go back to the FREQ menu.

3-7ME7220A
OPERATION MANUALSOFT KEYS

SETUP

Press to enter the Setup menu for adjusting parameters used by the RTS
Selecting the SETUP soft key brings up the following options:

NOTE
Correct setting of the
distance (DSTNCE) andantenna gain (ANT GN)
parameters is critical for
accurate system RCS
and power readouts.
DSTNCEDSTNCE

Figure 3-9.

ANT GN

UNITS

LASER

BACK

SETUP Soft Key Options

Adjusts the value that represents the physical distance between the antenna aperture of the radar and the antenna aperture of the RTS (Figure3-12).
Selecting the DSTNCE soft key from the SETUP menu brings up the following options:

EDIT

Figure 3-10.

3-8

RESET

BACK

DSTNCE Soft Key Options

EDIT

Press to edit the Distance value using the keypad numbers or theup/down arrow keys. Select 1.5 to 30 meters and press ENTER to implement.

RESET

Press to reset the Distance value to the factory default (2m).

BACK

Press to go back to the SETUP menu.

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ME7220A
OPERATION MANUALANT GN

SOFT KEYS

Adjusts the antenna gain value of the radar under test. This value is used
to calculate the power transmitted by the radar. Figures 3-11 and 3-12 illustrate the different parameters.
Radar Receive Beam

Radar Transmit Beam

Rv Max Gain

ME7220A OM

Figure 3-11.

Antenna Gain Parameters

Figure 3-12.

Antenna Alignment

Tx Max Gain

3-9

ME7220A
OPERATION MANUALSOFT KEYS

Selecting the ANT GN soft key from the SETUP menu brings up the following options:
TX MAX

Maximum transmit antenna gain of the radar under test.

RV MAX

Maximum receive antenna gain of the radar under test.

TX GN

Transmit antenna gain of the radar under test in the direction of the RTS
RECEIVE antenna.

RV GN

Receive antenna gain of the radar under test in the direction of the RTS
TRANSMIT antenna.
Selection of any of the above soft keys brings up the following menu:

TX MAX

Figure 3-13.

EDIT

TX GN

RV GN

Press to edit the parameter value using the keypad numbers or theup/down arrow keys.

Figure 3-14.

RESET

BACK

Antenna Gain Edit Menu

RESET

Press to reset the parameter value to the factory default.

BACK

Press to go back to the SETUP menu.

UNITS

BACK

ANT GN Soft Key Options

EDIT

3-10

RV MAX

Select the units used by the RTS to display the parameters.

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ME7220A
OPERATION MANUALSOFT KEYS

Selecting the UNITS soft key from the SETUP menu brings up the following options:

METRIC

Figure 3-15.

ME7220A OM

SAE

BACK

UNITS Soft Key Options

METRIC

Set the units to the METRIC standard.

SAE

Set the units to the SAE (English) standards.

BACK

Go back to the SETUP menu.

3-11ME7220A
OPERATION MANUALSOFT KEYS

LASER

Enable or disable the internal RTS alignment laser. The laser ON/OFF
switch on the keypad will turn the laser on or off only when the laser isenabled through this key sequence. The alignment laser is used to position the RTS relative to the radar under test. With the laser enabled,press the LASER ON/OFF key to turn the laser on and off.
Selecting the LASER soft key from the SETUP menu brings up the following options:

ENABLE

Figure 3-16.

BACK

LASER Soft Key Options

ENABLE

Press to Enable the alignment laser function.

DISABL

Press to Disable the alignment laser function.

BACK

Press to go back to the SETUP menu.

BACK

3-12

DISABL

Press to go back to the MAIN menu.

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ME7220A
OPERATION MANUALPOWER ON PROCEDURE

3-5 POWER ON PROCEDURE After making the necessary connections as described in Chapter 2, Installation, follow the procedure below to apply power to the system.
Step 1.

Using the power switch on the back panel of the RTS, turnthe power on for the main module. The “POWER ON” LED indicator on the RTS module will turn green when the power ison.
The RTS will run through a series of self checks to ensure thesystem is functioning properly.

Step 2.

Allow time for the system to warm up. A “SYSTEMWARMING UP” indicator appears at the top of the display
module and will remain on until the system reaches operating
temperature. The time it takes to reach that temperature willvary depending on the ambient temperature, and may be as
long as 30 minutes at an ambient temperature of 15 to 35°C .

NOTE
The DC power supply
voltage will be displayedin the lower left corner ofthe display module as
the self test is taking
place.

SYSTEM WARMING UPMESSAGERANGE SPEED

Figure 3-17.

RCS

FREQ

SETUP

Display Module Message “System Warming Up”

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ME7220A
OPERATION MANUALPOWER ON PROCEDURE

Self Test Errors

During the power-on self test, the following error indicators may appear on the display:
ERROR MESSAGE

MEANING AND SOLUTION

EXTERNAL POWER LOW

The DC power supply voltage is low.
Contact your nearest Anritsu Service Center
for assistance.

LOCK FAILEDEEPROM R/W FAILED

Symbols

The phase-locked loops failed to lock.
Restart the system. If the error message
reappears, contact your nearest Anritsu
Service Center for assistance.
The non-volatile memory system has failed.
Contact your nearest Anritsu Service Center
for assistance.

The following symbols may appear on the display reflecting the current state of the system:
Lock Fail Indicator ¾ This symbol will appear in the upper left cornerof the display if the phase-locked loops failed to lock. Restart the system. If the symbol reappears, contact your nearest Anritsu Service
Center for assistance.
Laser On ¾ This symbol will appear in the upper right corner of thedisplay and indicates that the alignment laser is on. The laser must be
enabled (page 3-12) and turned on using the LASER ON/OFF key (page
3-2).

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ME7220A
OPERATION MANUAL

3-6 SYSTEM SETUPSYSTEM SETUP

After making the necessary connections as described in Chapter 2, Installation, proceed with the following steps to set up the system.

NOTE
Step 1.

Use the alignment laser to position the main module so thatthe aperture of the TRANSMIT and RECEIVE antenna horns
on the RTS and the radar antenna aperture are parallel and aset distance apart. The RTS laser should point to the centerof the radar antenna. Refer to Figure 3-12, page 3-9.

Step 2.

Input the set distance between the RTS and the radar antenna and the gain of the radar antenna under the SETUP
menu (see Section 3-4, page 3-3).

The distance between
the RTS and the radar
antenna will depend on
the gain of the radar antenna necessary to insure far-field operation.
The minimum distanceshould be 1.5 meters.

3-7 SYSTEM CONTROL

Use the softkeys in the main menu of the display to control the Range,
Radar Cross Section (RCS), and Speed of the simulated target.

Target Simulation
Parameters

NOTE
Before performing target simulation measurements, theradar signal center frequency
parameter in the RTS must be
set, either manually or automatically. The accuracy of thetarget simulation measurement depends upon the accuracy of this frequency setting.

Three target simulation parameters are displayed on the screen:
Range, Speed, and RCS.
Range can be either NEAR or FAR. In addition to the simulated target, reflections from the RTS antennas and chassis will appear as stationary targets. Reflections from the chassis can be reduced, if
necessary, by using microwave absorbing shielding. Reflections fromthe antennas will always be present as a zero-Doppler target, with an
RCS on the order of the simulated NEAR target RCS, and at a range
equal to the set distance between the radar and the RTS.
The RCS for each simulated target is displayed corresponding to thetarget range set. For 0 dB attenuation, the target has a fixed maximum RCS value. The RCS attenuator can be varied from 0 to 50 dB tosimulate different size targets. The RCS is displayed in dBsm in the
RCS display area, and in sqm (or sqft) in the edit display area.
Speed can be varied from –250 km/h to +250 km/h in steps of at least
0.1 km/h. The Doppler corresponding to the speed is also displayed.
For a given value of speed, the Doppler shift depends on, and will vary
with, the radar center frequency.

Radar Signal Center
Frequency

The RTS default mode uses a tracking frequency algorithm to capture
the center frequency of the transmitted radar signal. The RTS thencenters its response at that frequency. The user can also manually set
the radar center frequency. These functions can be controlled via thesoftkey (FREQ) in the main menu of the display.
The tracking algorithm should work accurately for most radar signal
modulation. For signals with low duty cycles, the DELAY parametercan be increased to give the RTS detector longer processing times andimprove the accuracy of the detection.

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ME7220A
OPERATION MANUALPOWER MEASUREMENTS (Optional)

NOTE
For improved accuracy, set
the target range to FAR whenreading the internal power
detector.

Power Readouts
NOTE
For the power reading and the
RCS value to be accurate, theuser must input the correct
distance between the radarand the RTS and the correct
radar antenna gains (under
the SETUP menu). Refer toFigure 3-12.

3-8 POWER
MEASUREMENTS(Optional)

NOTE
When making power measurements at the POWER
port, the SPECTRUM port
must remain terminated.

For MANUAL mode, locate the radar center frequency using the external spectrum analyzer and set the RTS to that center frequency. To locate the frequency, first set the RTS to 76.5 GHz and then look for thesignal in the IF band of 4.7 to 5.7 GHz on the spectrum analyzer. The
IF band of 4.7 to 5.7 GHz corresponds to the radar signal band of 76 to
77 GHz. Once the center frequency is located, input the frequency
value into the RTS.
The ME7220A Radar Test System contains an internal power detector.
The system is calibrated such that the readout from this detector(which appears on the screen) is the actual power transmitted by theradar. The Effective Isotropic Radiated Power (EIRP) of the radar at
the radar antenna aperture is also displayed on the screen.

Connect the power meter sensor to the POWER METER PORT on theback panel of the RTS. Use the external power meter to read the power
level of the radar signal (at IF frequencies 4.7-5.7 GHz corresponding to
the RF frequency range of 76-77 GHz). The RTS should be set to MANUAL FREQ MODE with a radar center frequency of 76.5 GHz during thismeasurement. Use the calibration data provided and the power meter
port measured data to calculate the radar EIRP and transmitted power.
To calculate the EIRP at the radar aperture:
EIRP (dBm) = power meter reading (dB) – RTS cal factor (dB) –NOTE
The use of an external filter at
the power meter port, to limit
the bandwidth to 1 GHz or
less, may increase the measurement range by lowering
the noise floor.

æ l ö÷
10 ´ Log 10 ç
è 4pRø

2where l (m) = signal wavelength =c ( ms)speed of light in ms=
f ( Hz ) signal frequencyin Hz

and R (m) = the distance between the RTS and the radar in meters.

Radar Transmit Power (dBm) = EIRP (dBm) – GRADAR Tx
where GRADAR Tx = Transmit antenna gain of the radar in the direction of
the RTS receive antenna (see Tx Gain (qTX) in Figure 3-12, page 3-9).

3-16

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ME7220A
OPERATION MANUAL

3-9 SPECTRALMEASUREMENT(Optional)

NOTE
When making spectral
measurements at the
SPECTRUM port, the
POWER port must remain terminated.

SPECTRAL MEASUREMENT (Optional)

Connect a spectrum analyzer to the SPECTRUM ANALYZER PORT on theback panel of the RTS. Use the external spectrum analyzer to measure
the spectral characteristics of the radar signal (at IF of 4.7-5.7 GHz corresponding to the RF frequency range of 76-77 GHz). The RTS should be
set to MANUAL FREQ MODE with a radar center frequency of 76.5 GHz
during this measurement.
For the most accurate frequency measurements, connect the 10 MHz external reference from the spectrum analyzer to the 10 MHZ REFERENCEINPUT on the RTS rear panel. When a valid 10 MHz input signal is detected, the green LED next to the connector will be illuminated.

3-10 MEASUREMENT WITH In some cases, it may be desirable to perform measurements on the radar
NO RF SIGNAL

3-11 MAINTENANCE

ME7220A OM

under test (noise measurements, for example) without an RF signal beingtransmitted from the RTS. Rather then turning the RTS system completely off, use serial command #8, SET TRANSMIT RF SIGNAL OFF(page 4-5) to turn the RF signal off while the RTS system remains powered up. This practice allows the RF signal to be turned back on fasterand eliminates the need to wait for the system to warm up to operating
temperature (page 3-13) before continuing with further measurements.

The system as provided does not require any operator maintenance.

3-17/3-18

Chapter 4
Remote Operation
4-1 INTRODUCTION

4-2 DESCRIPTIONNOTE
If the ME7220A is to becontrolled through remote operation, the Display Module (page 2-3)
need not be installed.

This chapter provides information on controlling the ME7220A Radar
Test System from a remote PC using programming commands sent via
the provided serial port cable (see Section 2-6, page 2-6). The programming overview is followed by a list of commands separated into functionalgroups.

The Radar Test System must first be set into “remote” mode for communication with a computer. Remote mode differs from normal repetitivemodes. During remote mode, the Radar Test System suspends normal operations and attends to the serial port. The display module (if installed)
indicates when the Radar Test System is in remote operation mode. The
keys on the display module will not function while in remote operation
mode.
Once in remote mode, you can send control bytes and associated data to
the Radar Test System via the serial port. These control byte sequences
command the Radar Test System to perform various functions and activities. The serial port supports virtually all features accessible from the
keypad.
To complete the communication session, send the control byte to exit remote mode. Radar Test System resumes normal operations. You may also
exit the remote mode by using the escape key.

4-3 CABLING

4-4 SERIALCOMMUNICATIONPARAMETERS

ME7220A OM

Serial communications take place via the 9-pin connector on the back of
the Radar Test System (see Section 2-6, page 2-6). The Radar Test System
is a DTE-type serial device and therefore requires a “null modem” cablefor communication with a computer, which is also a DTE device. A nullmodem cable is supplied with the Radar Test System.

The Radar Test System communicates at a baud rate of 9600. It uses noparity bits, 8 data bits, and 1 stop bit (N-8-1). No hardware handshaking
is used.

4-1

ERROR CHECKING

4-5 ERROR CHECKING

4-6 PARAMETERVALIDATION

4-7 ENTERING REMOTE
MODE

ME7220A
OPERATION MANUAL

Since there is no hardware handshaking, byte level error handling must
be done by the controlling program. The expected number of response
bytes for each control byte works well for responses coming from the Radar Test System. For data streams going to the Radar Test System, the“watch dog timer” protects against interrupted transmissions by abortinga control byte sequence if the inter-byte time limit is exceeded.

The Radar Test System validates input parameters for each control byte
sequence. If there are no errors, the instrument sends an operation complete byte of #255 (FFh). If the input parameters are out of range or invalid, the Radar Test System notifies the computer by sending Parameter
Error Byte #224 (E0h). The Radar Test System discards the received data
and waits for the next control byte. If there is a time-out error, the instrument returns a response byte of #238 (EEh). When the instrument isqueried for data, the instrument response is comprised of the data sequence followed by an operation complete byte of #255 (FFh).

Send the Enter Remote Mode Byte #69 (45h) to the Radar Test System.
The Radar Test System serial port buffer is one byte wide. No internalbuffer exists, so waiting is essential. If the Radar Test System is not in remote, sending a second byte overwrites the original byte commanding it
to go into remote.
Once the response string is received from the from Radar Test System,
the unit is in remote mode.

4-8 EXITING REMOTE MODE Send the Exit Remote control byte #255 (FFh) to the Radar Test System.
The Radar Test System sends a response byte of 255 (FFh) then exits remote mode.

4-9 CHANGES TO
OPERATING
PARAMETERS

System parameters changed during remote mode remain changed for normal operation. They are not automatically written to the non-volatile
EEPROM. Turning off power erases the changed settings.
To save the changes, save the change to one of the setup memories. Use
either the run-time setup (location 0, which holds the power-on defaults)
or one of the nine saved setups. See control byte #18 (12h) for details.

4-10 EEPROM WRITECYCLE LIMITATION

4-2

The EEPROM, used to store setups, has a guaranteed lifetime of at least
100,000 write cycles and an unlimited number of read cycles. The write
cycle limitation is for a specific location. For this reason, changed systemparameters are not automatically stored to the EEPROM. Be aware of
the EEPROM write cycle limitation when programming the Radar Test
System. Keep the number of write cycles to a minimum.

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ME7220A
OPERATION MANUAL

4-11 SERIAL COMMANDS
Setting Values

SERIAL COMMANDS

The following commands provide for setting values, getting values andsaving and recalling setups.
The following commands are used for setting values.

SET TARGET RANGE

Command Value = #2 (02h)This command requires an 8-bit value following the command. The
8-bit value can either be 0 (Near) or 1 (Far).
SET TARGET SPEED

Command Value = #3 (03h)This command requires a 32-bit value following the command. The
32-bit value will be assigned to the Speed parameter. This value must
be positive (polarity can be set via the SET TARGET DIRECTION
function). The command requires that the value be in milli-km/h or
milli-mph, depending on the current units setting (for example, 10km/h should be sent as 10000).
SET TARGET DIRECTION

Command Value = #4 (04h)This command requires an 8-bit value following the command. The
8-bit value can either be 1 (away) or –1 (towards).
SET RCS ATTENUATION

Command Value = #5 (05h)This command requires a 32-bit value following the command. The
32-bit value will be assigned to the RCS Nominal Attenuation parameter.
SET RADAR CENTER FREQUENCY

Command Value = #17 (11h)This command requires a 32-bit values following the command. The
32-bit value will be assigned to the Radar CF parameter. The command requires that the values be in MHz. This command will also set
the unit into MANUAL FREQ MODE.
PERFORM FREQUENCY ACQUIRE

Command Value = #64 (40h)This command will execute an AUTO FREQUENCY ACQUIRE
Tracking routine. This command will also set the unit into AUTO
FREQ MODE.

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4-3

ME7220A
OPERATION MANUALSERIAL COMMANDSSET FREQUENCY ACQUIRE INTERVAL

Command Value = #7 (07h)This command requires a 32-bit value following the command. The
32-bit value will be assigned to the Auto Frequency Acquire Interval
parameter. The command requires that the value be in seconds.
SET DETECTOR AVERAGE DELAY

Command Value = #16 (10h)This command requires a 32-bit value following the command. The
32-bit value will be assigned to the Detector Averaging Delay parameter. The command requires that the values be in milli-seconds.
SET DISTANCE TO RADAR

Command Value = #6 (06h)This command requires a 32-bit value following the command. The
32-bit value will be assigned to the Distance to Radar parameter. The
command requires that the value be in 10 micrometers or 10 micro-feet, depending on the current units setting. (e.g. 2.5 feet should
be sent as 250000, 8.23 meters should be sent as 823000.)
SET RADAR ANTENNA MAX TRANSMIT GAIN

Command Value = #25 (19h)This command requires a 32-bit value following the command. The
32-bit value will be assigned to the Radar Antenna Max Transmit
Gain parameter. The command requires that the value be in milli-dB.
SET RADAR ANTENNA MAX RECEIVE GAIN

Command Value = #26 (1Ah)

This command requires a 32-bit value following the command. The
32-bit value will be assigned to the Radar Antenna Max Receive Gainparameter. The command requires that the value be in milli-dB.
SET RADAR ANTENNA TRANSMIT GAIN

Command Value = #27 (1Bh)This command requires a 32-bit value following the command. The
32-bit value will be assigned to the Radar Antenna Transmit Gain parameter in the direction of the RTS receive antenna. The command requires that the value be in milli-dB.
SET RADAR ANTENNA RECEIVE GAIN

Command Value = #28 (1Ch)This command requires a 32-bit value following the command. The
32-bit value will be assigned to the Radar Antenna Receive Gain parameter in the direction of the RTS transmit antenna. The command
requires that the value be in milli-dB.

4-4

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ME7220A
OPERATION MANUALSERIAL COMMANDSSET UNITS

Command Value = #9 (09h)This command requires an 8-bit value following the command. The
8-bit value can either be 0 (SAE units) or 1 (metric units).

SET LASER ENABLE

Command Value = #15 (0Fh)This command requires an 8-bit value following the command. The
8-bit value should be a ‘1’ to turn on the laser and a ‘0’ to turn off thelaser.
SET TRANSMIT RF SIGNAL OFF

Command Value = #8 (08h)This command requires an 8-bit value following the command. The
8-bit value can be either ‘0’ (RF SIGNAL OFF) or ‘1’ (RF SIGNAL ON).

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4-5

ME7220A
OPERATION MANUALSERIAL COMMANDS

Getting Values

The following commands are used for getting values.

GET TARGET RANGE

Command Value = #48 (30h)This command will send a 32-bit value back to the controller. The
32-bit value will be the Distance to Target in either millimeters or
milli-feet, depending on the current units setting.
GET TARGET SPEED

Command Value = #49 (31h)This command will send a 32-bit value back to the controller. The
32-bit value will be the Speed of Target in milli-KPH or milli-MPH, depending on the current units setting. (e.g. 10.5 KPH will be received
as 10500.)
GET TARGET DOPPLER

Command Value = #50 (32h)This command will send a 32-bit value back to the controller. The
32-bit value will be the Doppler Frequency in Hz.
GET TARGET RCS

Command Value = #51 (33h)This command will send a 32-bit value back to the controller. The
32-bit value will be the RCS in milli-dBsm.
GET RADAR CENTER FREQUENCY

Command Value = #52 (34h)This command will send a 32-bit value back to the controller. The
32-bit value will be the Radar Frequency in MHz.
GET RADAR POWER

Command Value = #53 (35h)This command will send a 32-bit value back to the controller. The
32-bit value will be the Power in milli-dBm.
GET RADAR EIRP

Command Value = #54 (36h)This command will send a 32-bit value back to the controller. The
32-bit value will be the EIRP in milli-dBm.

4-6

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ME7220A
OPERATION MANUAL

Setup Commands

SERIAL COMMANDS

The following commands are used for saving and recalling systemsetup information.

SAVE SYSTEM SETUP

Command Value = #18 (12h)This command requires an 8-bit value following the command. The
8-bit value can be an integer from 0 to 9 and will represent the storage
location for the setup.
RECALL SYSTEM SETUP

Command Value = #19 (13h)This command requires an 8-bit value following the command. The
8-bit value can be an integer from 0 to 9 and will represent the storage
location for the setup.

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4-7

ME7220A
OPERATION MANUAL

EXAMPLE CODE

4-12 EXAMPLE CODE

The following is an example of an ME7220A Radar Test System program
written in Visual Basic (6).

The first step is to add the Serial Port library and to set the communication port. When using Visual Basic,
add the activeX component for serial port communication. This component can be found in MScomm32.ocx.
In our examples below, the component name is CommPort1.
The Serial Port can be set as follows:
Bits per second = 9600
Parity = N/A
Data bits = 8
top bit = 1
CommPort1.InputMode = comInputModeBinary
Then it can be initiated by the following command:
CommPort1.PortOpen = True
The following API functions must be globally declared:
Declare Function GetTickCount Lib "kernel32" () As Long
Declare Sub Sleep Lib "kernel32" (ByVal dwMilliseconds As Long)
Declare Function TransmitCommChar Lib "kernel32" _(ByVal nCid As Long, ByVal cChar As Byte) As Long
Starting and ending a communication session using the ENTER REMOTE and EXIT REMOTE functions:‘Enter remote mode at the beginning of the communication session
Dim Buffer As String
Dim Value As Double
Dim TempVal As Long
'set up the 8-bit command value (command #69)
Value = Val(69)TempVal = (Value And &HFF)
If TempVal < 0 Then TempVal = TempVal + 256
Buffer = ChrB$(Value)'get Port id
TempVal = Val(CommPort1.CommID)'send the command to the instrument
Call send_com_string(TempVal, Buffer)‘Exit remote mode to end the communication session‘Note that the display screen of the Display Module is not‘updated until remote mode is exited
Dim Buffer As String

4-8

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ME7220A
OPERATION MANUAL

EXAMPLE CODE

Dim Value As Double
Dim TempVal As Long
'set up the 8-bit command value (command #255)
Value = Val(255)
TempVal = (Value And &HFF)
If TempVal < 0 Then TempVal = TempVal + 256
Buffer = ChrB$(Value)'get Port id
TempVal = Val(CommPort1.CommID)'send the command to the instrument
Call send_com_string(TempVal, Buffer)

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4-9

EXAMPLE CODE

ME7220A
OPERATION MANUAL

The following example shows how to set values in the instrument by sending it an 8-bit command followed
by a 32-bit input parameter. This could be used, for example, for setting the target speed: send 8-bit
command “3” and then 32-bit input parameter “10000” for 10km/h. Some “setting” commands are followedby 8-bit input parameters and some do not require any parameters to follow them. The following program
can be easily modified to work for those other cases.
Dim Buffer As String
Dim Value As Double
Dim TempVal As Long
Dim Message$, Default$, MyValue$, Title$'Input box for reading the value of the 8-bit command to be sent
Message = "Enter Value of command (8-bit)"
Title = "Set Command" ' Set title.
Default = "" 'Set default.
'Display message, title, and default value.
MyValue = InputBox(Message, Title, Default)
If MyValue = "" Then
MyValue = "0"
End If'set up the 8-bit value
Value = Val(CStr(MyValue))
TempVal = (Value And &HFF)
If TempVal < 0 Then TempVal = TempVal + 256
Buffer = ChrB$(TempVal)'get Port id
TempVal = Val(CommPort1.CommID)'send the command to the instrument
Call send_com_string(TempVal, Buffer)'Input box for reading the value of the 32-bit input parameters to be sent
Message = "Enter Value of input parameter (32-bit)"
Title = "Set Command" ' Set title.
Default = "" ' Set default.
' Display message, title, and default value.
MyValue = InputBox(Message, Title, Default)
If MyValue = "" Then
MyValue = "0"
End If

4-10

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ME7220A
OPERATION MANUAL

EXAMPLE CODE

'set up the 32-bit value
Value = Val(CStr(MyValue))
Buffer = ConvertDoubleToFourSigned(Value)'get Port id
TempVal = Val(CommPort1.CommID)'send the input parameter to the instrument
Call send_com_string(TempVal, Buffer)

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4-11

EXAMPLE CODE

ME7220A
OPERATION MANUAL

The following example shows how to send an 8-bit command to the instrument and then receive the 32-bit
parameter that the instrument sends back. This could be used for all the “getting” commands. For example,
to get the target speed: send 8-bit command “49” and then read the returned parameter, which would be“10000” for a setting of 10km/h.
Dim Buffer As String
Dim Value As Double
Dim TempVal As Long
Dim Message$, Default$, MyValue$, Title$, tempacp$'Input box for reading the value of the command to be sent
Message = "Enter Command Number (in decimal)."Title = "Get Command" ' Set title.
Default = "" ' Set default.
' Display message, title, and default value.
MyValue = InputBox(Message, Title, Default)
If MyValue = "" Then
MyValue = "0"
End If'clear input buffer before sending the command to ensure an empty buffer
tempacp$ = CommPort1.Input'set up the 8-bit command value
Value = Val(MyValue)
TempVal = (Value And &HFF)
If TempVal < 0 Then TempVal = TempVal + 256
Buffer = ChrB$(Value)'get Port id
TempVal = Val(CommPort1.CommID)'send the command to the instrument
Call send_com_string(TempVal, Buffer)'read the returned 32-bit parameter from the instrument
Call Read32Bit(CommPort1, CInt(Value))

4-12

ME7220A OM

ME7220A
OPERATION MANUAL

EXAMPLE CODE

The following three functions are used in the examples given above:‘SET FUNCTION
Public Function send_com_string(comm_ID As Long, send_string As String)'This function is used in place of the CommPort1.ouput function'and it uses a windows API call instead'This must be done because CommPort1 doesn't support real binary'transfer and that causes a problem in DBCS(Japanese,'Chinese Windows) computers
Dim i As Long
Dim the_len As Long
Dim temp_byte As Byte
On Error GoTo send_com_string_handler
send_com_string = true
the_len = LenB(send_string)If the_len = 0 Then Exit Function
For i = 1 To the_len'All strings should be send as BYTEs(Not as Strings)
temp_byte = CByte(AscB(MidB$(send_string, i, 1)))'This is the API used to send thru COMM PORT
TransmitCommChar comm_ID, temp_byte
Sleep (1000)
Next iExit Function
send_com_string_handler:
send_com_string = false
End Function

ME7220A OM

4-13

EXAMPLE CODE

ME7220A
OPERATION MANUAL‘READ FUNCTION
Public Function Read32Bit%(Commctl As Control, traceNum%)Dim timedOut%, initialTicks&, nowTicks&, timeoutval&, ByteNum&
Dim tempacp$, tempacp1$
Dim strarrOutput(0 To 4) As String
Dim strOutput As String
Dim intLength As Integer
Dim j As Integer
On Error GoTo Read32BitHandler
timeoutval& = 1000 '1 sec 1000 is 1 seconds
timedOut% = False 'Firmware is calculating
initialTicks& = GetTickCount()Do
DoEvents
nowTicks& = GetTickCount()
If (nowTicks& - initialTicks&) > timeoutval& Then
timedOut% = True
End If
ByteNum& = Commctl.InBufferCount
Loop Until (ByteNum& = 29) Or (timedOut% = True)'input mode of the comm port is binary
tempacp$ = CStr(Commctl.Input)'The buffer will return 5 bytes: the 4-byte parameter followed by'the operation complete byte (#255). In the routine below, only the'first 4 bytes are read (dropping the operation complete byte of #255)'read the 4 bytes (or 32-bits)(if 64-bit info needs to be read, use j=0 to 7)
For j = 0 To 3
tempacp1$ = AscB(MidB(tempacp$, j + 1, 1))
strarrOutput(j) = Hex$(tempacp1$)
intLength = Len(strarrOutput(j))
If intLength < 2 ThenstrarrOutput(j) = "0" + CStr(strarrOutput(j))
ElsestrarrOutput(j) = CStr(strarrOutput(j))
End IfNext j4-14

ME7220A OM

ME7220A
OPERATION MANUAL

EXAMPLE CODE

'32-bit output in hex
strOutput = CStr("&H" + strarrOutput(0) + strarrOutput(1) + strarrOutput(2) +strarrOutput(3))'32-bit output in decimal
strOutput = CStr(CDec(strOutput))
Read32Bit% = True
Exit Function
Read32BitHandler:
msgbox = "ERROR" + Chr(10) + "tempacp$ = " + tempacp$ + Chr(10) + Err.Number+
Chr(10) + Err.Description
Read32Bit% = False
End Function

ME7220A OM

4-15

EXAMPLE CODE

ME7220A
OPERATION MANUAL'CONVERSION TO SIGNED 32-BIT FUNCTION
Public Function ConvertDoubleToFourSigned(Value As Double) As String' DSB 07242000
Dim ReturnBuffer As String' Description : This procedure will convert a double precision floating' point number to a string'' Parameters : Value Number to be converted'' Returns : ReturnBuffer Converted number
On Error GoTo ConvertDoubleToFourSignedHandler
ReturnBuffer = ChrB$(0) + ChrB$(0) + ChrB$(0) + ChrB$(0)ConvertDoubleToFourSigned = ReturnBuffer
If Value# < 0 Then
' DSB
Value = Value + 2 ^ 32
' DSB
End If' DSB
If Value# < 4294967296# Then
MidB$(ReturnBuffer, 1, 1) = ChrB$(Int(Value# / 16777216))' 2 to the 24
Value# = Value# - 16777216# * (AscB(MidB$(ReturnBuffer, 1, 1)))
MidB$(ReturnBuffer, 2, 1) = ChrB$(Int(Value# / 65536))' 2 to the 16
Value# = Value# - 65536# * (AscB(MidB$(ReturnBuffer, 2, 1)))
MidB$(ReturnBuffer, 3, 1) = ChrB$(Int(Value# / 256))' 2 to the 8
Value# = Value# - 256# * (AscB(MidB$(ReturnBuffer, 3, 1)))
MidB$(ReturnBuffer, 4, 1) = ChrB$(Int(Value#))' 2 to the 0
End IfConvertDoubleToFourSigned = ReturnBuffer
Exit Function
ConvertDoubleToFourSignedHandler:
ConvertDoubleToFourSigned = ChrB$(0) + ChrB$(0) + ChrB$(0) + ChrB$(0)End Function

4-16

ME7220A OM

Appendix A
Dimensional Drawings
A-1 INTRODUCTION

ME7220A OMM

This appendix provides dimensional drawings of the ME7220A Radar
Test System main and display modules. Dimensions are noted in millimeters.

A-1/A-2

ME7220A
OPERATION MANUALINTRODUCTION

34.92

90.06

485.6

54.04

ME7220A
Radar Test System

ANTENNAOUTPUTCAUTIONLASER LIGHT
DO NOT STARE INTO BEAMLASEROUTPUT

POWER OUTPUT :<1mW
WAVELENGTH: 600-700nm
CLASS II LASER PRODUCTANTENNA
INPUT

CAUTION
0dBm Max Input
Avoid Static
Discharge

Figure A-1.

449.99542.57

426.7

69.85

104.89COMPLIES WITH 21 CFR 1040.10 AND 1040.11

197.6

Radar
Test
SystemLaser Light Emitted From This Aperture

177.0

76-77 GHz

553.57 ** This dimension will increase by 38 mm
with installation of Options 2A, 2B or 2C,
and by 51 mm with Option 3A.

Main Module Dimensional Drawing

ME7220A OM

A-3

INTRODUCTION

Figure A-2.

A-4

ME7220A
OPERATION MANUAL

Display Unit Dimensional Drawing

ME7220A OM