BCF Technology OVISCAN 6 Manuale utente

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BCF TECHNOLOGY LTD

OVISCAN 6 + DUOSCAN 3

TECHNICAL MANUAL

drawings or diagrams is forbidden.

This manual is confidential to BCF Technology Ltd. and is supplied for use only in connection

with the operation and/or maintenance of the OVISCAN 6 as supplied by BCF Technology Ltd.

The contents must not be used for any other purposes, nor disclosed to any third party, without

prior consent of BCF Technology Ltd.

This document contains information available at the time publication. BCF Technology Ltd.

reserves the right to modify or revise its contents.

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INTRODUCTION

This manual is intended to supplement the operators manual for the BCF OVISCAN 6 giving

more detailed technical information about the instrument and the data necessary to carry out

servicing and repair procedures.

Full information is given for the control console and module with some information being

supplied for the probes.

EQUIPMENT WARRANTY

The OVISCAN 6, including accessories is warranted against defects in design, materials or

workmanship, for a period of 12 months, from the date of commencement of the warranty period.

If any defect in design, material, or workmanship appears within the period of warranty, BCF

Technology Ltd. or its designated agent will in the case of all equipment, correct the defect by

making any necessary repairs or at its option, replacing any defective parts.

This warranty does not apply to and the company assumes no responsibility for damage or

deterioration due to any cause other than that specified above and in particular, but not by way of

limitation, this warranty does not apply to and the company assumes no responsibility for normal

wear and tear, or for damage or deterioration if the equipment has been subject to abnormal

conditions.

EQUIPMENT SERVICING

BCF Technology's products are supported by a world-wide network of highly trained technical

service representatives and engineers for prompt service of customer needs.

If required, rapid service assistance can be provided by contacting your local BCF Technology

representative, or communicating directly to:

BCF Technology Ltd.

3 Rutherford Square

Brucefield Industrial Park

Livingston

West Lothian

EH54 9BU

TEL: 44 (0) 1506 460023

FAX: 44 (0) 1506 460045

Email: office@bcftechnology.co.uk

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CONTENTS

2DESCRIPTION AND OPERATION 4

Probe and Ultrasound Energy 4

OVISCAN 6 6

Overview 6

Console 6

CIRCUIT DESCRIPTION : Console PCB 9

Module 13

CIRCUIT DESCRIPTION : System PCB 15

CIRCUIT DESCRIPTION : Supply PCB 19

CIRCUIT DESCRIPTION : Interface PCB 21

MECHANICAL DISASSEMBLY 24

CONSOLE 24

MODULE 24

ANNUAL MAINTENANCE 25

CIRCUIT DIAGRAMS, PCB TEST AND LAYOUT 27

Console 27

Console PCB 27

Module 27

System PCB 27

Interface PCB 27

Supply PCB 27

WIRING SCHEDULES 27

Console 27

Module 27

Keypanel 27

APPENDIX : CONSOLE PCB DIAGNOSTIC INFORMATION 28

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Description and operation

Probe and Ultrasound Energy

The standard probe has four transducers mounted in a drum which rotates in silicone fluid.

Connection to the rotating transducers is via slip rings and brushes from which four coaxial

cables carry the transducer signals to the receiver board. Only one transducer is used at any one

time.

The transmitter pulse waveform is selected to give efficient transformation from electrical energy

to ultrasound and a reduction of reverberation energy. The initial pulse at the transducer is

negative with an amplitude between 25 V. and 200 V. depending on the transmit power selected.

The negative voltage is held for a time equal to half the natural resonance period of the transducer

then released for an equal period then re-applied for a further equal period.

The system normally operates with the transmitter pulse width at the natural resonant frequency

of the transducer crystals and with the receiver filters set to the same frequency.

The system can be operated at other than the natural frequency, controlled from the menu settings.

The silicone fluid acts both as a lubricant for bearing surfaces and as a coupling medium for the

transmission of ultrasound energy to and from the face of the transducers. Ultrasound energy of

the frequency used in the OVISCAN 6 is strongly absorbed in air and will travel only a few

millimeters through it.

When the probe is not in contact with an object a characteristic reverberation pattern is displayed

on the screen. This happens because of the very large difference in acoustic impedance between

the material of the probe window and the outside air resulting in a very strong echo from the face

of the window. As this is close to the transducer, energy reflects back and forth between the

window and the transducer. This continues until the energy is reduced to an insignificant level.

When the probe is held in contact with an object which readily conducts ultrasound the

reverberation pattern disappears as the sound continues straight through the window and into the

object. In the case of using an animal as a scanned subject a couplant must be used to exclude air

from between the probe and the subject and prevent reverberation.

Because of the small distances involved in the generation of the reverberation pattern any small

distortion in the window can appear as a large distortion in the pattern. These distortions too will

disappear when the probe contacts a subject. Distortions in the window may occur as a result of

manufacturing tolerances or as a result of accidental damage to the probe.

For a similar reason, small differences in angular alignment between the transducers may appear

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as a "flicker" in the reverberation pattern when the probe is not in contact with a subject. This

effect which shows a small random variation from probe to probe will also disappear when the

probe is scanning normally in contact with a subject.

The probe head also contains the following:

A dc motor and gear train to rotate the transducer drum.

A magnetic pick up, the resolver, sensing teeth on one of the gears to provide a signal for

rotational speed control and drum position feedback.

A magnetic pick up, the index sensor, sensing a slot cut into one of the gears providing a

signal to align the screen image with the transmitted sound.

A magnetic coupling to transmit the rotating forces through to the sealed compartment

containing the transducer drum.

A capillary tube to accommodate normal expansion and contraction of the volume of

silicone fluid without pressure changes.

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OVISCAN 6

Overview

The CONSOLE provides the display and interface to tally, drafting gate, RFID reader and video

monitor while the slide-in MODULE provides the ultrasound function.

Connection to and from the module is through the securing latches which provide power to the

MODULE and 5 blind mating contacts which provide serial communication and pass video

signals between the CONSOLE and MODULE.

The module can produce an ultrasound scan as a stand-alone

unit when latched to a battery and a

portable display connected.

The console can also function as a stand-alone video monitor in the absence of a Duo-Scan.

Console

Console components are built

into an inner chassis which

slides into the outer case. This

provides good environmental

and electromagnetic protection

for system components. Further

protection is provided by a

protective carry case. The

system is resistant to dust,

vibration and water splash.

DISPLAY

The LCD display normally

displays the Ultrasound image

CONSOLE

PCB

DISPLAY

MODULE

CONSOLE

PROBE

POWER

TALLY

Drafting

O/P

Video Out

Video In

CONSOLE

PCB

DISPLAY

DC Power

Tally

Drafting

O/P

Video Out

Video In Rear

Panel

Front

Panel

Blind Mate

Connectors

From module

Serial Link

Digital Video

Serial

Link

Rear

Panel

RFID

Display

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using digital Video output fed from the module to the console PCB via the blind mating contacts

at the rear of the module. The video is a proprietary digital format, this is converted into a VGA

signal for display on the LCD panel.

The LCD can alternatively be used in Video Monitor Mode to display NTSC analogue video

input from either the console rear panel video input connector or from the internal RF Video

receiver. Analogue video inputs are converted into a VGA signal.

CONNECTIONS

The rear panel provides connectors for DC power in (2 pin Binder), video in & video out (BNC)

and Drafting Gate output (5 pin Binder). The front panel connector is for the tally controller (6

pin Binder).

CONTROLS

The only direct input control to the console is the Tally handpiece which is used to power the

console on and select one of three video sources when the console is not connected to a Duo-scan.

When connected to a Duoscan power-on commands and any setup information is transferred to

the console via the serial link. Tally keypresses are handled by the console PCB which then

transfers the information to the module via the serial link.

POWER

The Console is powered with 12V DC via the 2 pin connector on the rear panel. The 12V DC

input is distributed to;

The Module, wired to the latches on the side of the Console through a 2.5A polyfuse.

The Console PCB. Circuitry has a 2.5A polyfuse and is reverse polarity protected.

The drafting gate output (via the Console PCB) with separate 2.5A polyfuse.

Once power is applied to the console PCB it remains in a low power standby mode, waking

briefly every second to check for serial data or tally command to power on in scanner mode or

video monitor mode.

VIDEO SWITCHING

If the console is powered without the Duo-Scan module present, pressing keys 1,2 or 3 on tally

handpiece switches the console on in video monitor mode. In this mode, the tally switches

between different video inputs; tally 1 switches to the Video Input BNC on the rear panel, tally 2

switches to the RF video receiver on the console PCB, each subsequent press of tally 2 cycles

through the 4 RF channels, tally 3 selects the Digital Video Input on the blind mating connectors.

Tally 0 returns the console into low-power, standby mode.

POWER ON SEQUENCE

Following power on, the Console runs through the following sequence:

1) Checks the supply voltage, if less than 9 volts then the console will display a “Low Battery”

message for approximately 6 seconds before switching into standby.

2) Configures its on board peripherals and switches to standby mode (LED 2 illuminates briefly).

WAKEUP SEQUENCE

On waking from Standby, the Console performs the following operations:

1) Checks the supply voltage, if less than 9 volts then the console will display a “Low Battery”

message for approximately 6 seconds before switching into standby.

2) Configures its on board peripherals and displays ‘Software OK’ message

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3) Establish communications with the Duo-Scan module, if the appropriate response is received,

the console displays a “Duo Scan OK” message and goes into Duo-Scan mode. If no (or an

incorrect) response is received, the Console displays “Check Duo Comms” and switches into

Video Monitor mode, defaulting to the digital video input.

OPERATION (DUO-SCAN MODE)

During normal operation the Console runs through the following sequence in a repeating loop.

1) Check battery voltage if less than 9 volts then the console will display a “Low Battery”

message for approximately 6 seconds before switching into standby.

2) Poll Tally input to see if a button has been pressed.

If a button is pressed, the appropriate value is sent to the Duo-Scan module and the console waits

for a reply.

If the correct reply is received, the console continues with the normal sequence.

If no (or incorrect) reply is received, the Console displays “Check Duo Comms” and switches into

Video Monitor mode, defaulting to the digital video input.

3) Poll Duo-Scan serial link for any received data, if any commands are received, the Console

executes the appropriate routine: Brightness/Contrast, Drafting Gate setup, Power Off and the

store Brightness/Contrast commands.

OPERATION (VIDEO MONITOR MODE)

In Video Monitor Mode, the console polls the Tally input to check for button presses, the buttons

have the following effects:

Tally 1: Console displays “External Video” and switches to the Video In BNC on the rear panel.

Tally 2: Console displays “RF Channel X” where X is the currently selected RF video channel,

each press of the button cycles through the 4 available channels.

Tally 3: Console displays “Duo Scan Video” and switches to the Digital Video input on the blind

mate connectors.

Tally 0: Console switches into standby mode.

OPERATION (STANDBY MODE)

In Standby mode, the Console goes into a low power ‘sleep’ mode, it wakes up every second and

performs the following checks:

1) Check battery voltage, if the console entered standby due to a low battery, the console will not

power up unless the voltage is more than 11V, otherwise the battery voltage has to be above 10V.

2) Poll Duo-Scan Serial link, if any data has been received, the console will exit standby and

perform the Power On sequence.

3) Poll Tally, if any button on the tally controller is pressed, the console will exit standby and

perform the Power On sequence.

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CIRCUIT DESCRIPTION : Console PCB

The Console PCB provides tally inputs, drafting outputs, communication with the Duo-Scan

module, video decoding and display signals and power. The 68HC processor (U2) is in overall

control of the operation of the Console PCB with the ability to disable parts of the circuit, as well

as shutting off power to all components except the tally pullups and RS232 transceiver (U7).

The processor reads the tally data, switches the drafting gate outputs, provides serial

communications with the Duo-Scan and the RFID reader and selects which of the 3 video inputs

is to be decoded and displayed.

POWER SUPPLY

The power supply section of the Console PCB provides power to all of the devices on the PCB

and to the inverter board for the LCD display.

The following supplies are generated:

Parallel

Video Data

Parallel

Video Data

Serial Links

Duo-Scan & RFID

Enable

Received Video

Drafting Outputs

Channel Select

Enable

Tally Inputs

Power On

Power Supply

Tally Pullups

RF Video Rx

Video Decoder

LVDS De-serialiser

Drafting

Output

RS232

Interfaces

EP1C3T100C6

FPGA

12Vdc

Tally

Input

Aerial

Video In

Digital Video In

SK2

Display

1.5Vdc

1.8Vdc

3.3Vdc Standby

3.3Vdc (a)

3.3Vdc (d)

5Vdc

Block Diagram

68HC908AP8

Processor

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3.3Vdc Standby – Supplied by linear regulator, U13, to the processor, U2, RS232 transceiver, U7,

and tally inputs pull ups (RN1 & RN2). This supply is permanent and cannot be switched off, so

that the processor remains powered in standby mode and can detect tally inputs or serial data.

12Vdc – Supplied by switching regulator, U5, to the LCD Display inverter board and to the other

voltage regulators (except the 3.3Vdc standby). This supply is under processor control via the

‘Power on’ line (U2 pin 42 to U5 pin 6, active high). Disabling this supply also disables the other

supplies, placing the Console in Standby mode. U5 is a Buck/Boost switching regulator which

will generate regulated 12Vdc from a supply voltage of 9-18Vdc. External switching components

M5-M8 are used in pairs according to whether the input voltage is above or below 12V; in step up

mode, M5 is on, M6 is off and M7 & M8 are switched. In step down mode, M7 is on, M8 is off

and M5 & M6 are switched. R26 provides current feedback to the device.

5Vdc – Supplied by switching regulator, U10, to the Airwave RF video receiver (RX2) and the

video amplifier U11 via the linear regulator (U14).

The switching regulator steps down the 12 supply from U5 to 5.35Vdc, this is fed to linear

regulator U14 which supplies a regulated 5Vdc supply to the RF video receiver. The output from

U14 may be disabled by the processor via the ‘Vid RX On” line (U2 pin 37 to U14 pin 7

Enable=High).

3.3Vdc – Supplied by switching regulator, U9, split into 2 supplies, 3.3VD and 3.3VA (digital

and analogue) separated by filters. This regulator also supplies power to the 1.8 & 1.5V supplies.

The 3.3VD supplies the analogue video converter and LVDS De-serialiser (U3 & U1), the crystal

for the dgital video converter (X2) and the FPGA (U6).

The 3.3VA supplies the digital video converter (U1).

1.8Vdc – Supplied by linear regulator, U12, this regulator is powered by the 3.3Vdc supply.

The 1.8Vdc supplies the analogue video decoder (U3).

1.5Vdc - Supplied by linear regulator, U4, this regulator is powered by the 3.3Vdc supply.

The 1.5Vdc supplies the FPGA (U6).

Video Processing

Analogue video inputs:

The Console PCB accepts analogue video from 2 sources; RF, via the Airwave receiver and

composite via the Molex connector J11.

RF Video: The Airwave receiver (RX2) receives RF video via the aerial connected to PCB, the

receiver has 4 input selection lines (RF_SEL_0 to RF_SEL_3 all active low) which are controlled

by the processor, U2, to select the desired channel. The power supply to the receiver (5Vdc) can

be disabled by the processor, switching off the receiver.

The selected channel is fed to the External Video Out connector (J10) via the video amplifier U11

and to Input A (pin 1) of the Analogue Video Decoder.

External Video: The external video input is fed to connector J11 and from there to input B (pin

2) of the Analogue Video Decoder.

Analogue video decoding:

The Analogue Video Decoder (U3) has 2 video inputs (A & B) which are connected to the RF

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