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16

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Technical Description

4.16 FD2-P, SD2-P, MD2-P, FD1-P, FD3-P, RD2

All  Pass

Network

Flow*

Separation

ANR

P

ro

b

e

  C

o

n

n

e

c

to

r

Block Diagram

ANR

Sense

All  Pass*

Network

ANR*

Soft

Limiter

Soft*

Limiter

Stereo*

Power

Amplifier

FHR^^

Signal
Cond.

Automatic

Gain  ^^

Control

Zero*

Crossers

Gain^

Tare^

Probe

Identification

Supply

Ground

Slave

Microcontroller

Master

Microcontroller

Battery

Monitor

Display

Data+

Output

Reset

Battery

PSU

Split  Rail

Generator

Analogue*

Waveform

Outputs

On/Off

Switch

Mode/

Function

Buttons

*  MD2,  SD2,  RD2  Only
+  Not  fitted  on  SD2,  FD1-P

P  or  FD3-P

P

^  Fitted  on  RD2
^^  Not  fitted  on  RD2,  SD2  or  FD2

Содержание D900-P

Страница 1: ...distributors for further information on service contracts R SERVICE MANUAL with people in mind and are trademarks of Huntleigh Technology Limited As our policy is one of continuous improvement we res...

Страница 2: ...930 P Mini Dopplex D900 P 14 4 16 FD2 P SD2 P MD2 P FD1 P FD3 P RD2 16 4 17 Obstetric Probe OP2HS OP3HS D920 P D930 P FD1 P FD3 P 19 4 18 Vascular Probe VP4HS VP5HS VP8HS VP10HS EZ8 20 4 19 PPG Probe...

Страница 3: ...P RD2 Parts List 49 10 4 Obstetric and Vascular Probe Parts List 51 10 5 Fixed Waterproof Probes 52 10 5a D920 P D930 P FD1 P HSB Series Probe Parts List 53 10 5b D920 P D930 P FD1 P FD3 P Probe Part...

Страница 4: ...d component level possible Units within the warranty period must not be dismantled and should be returned to Huntleigh Healthcare Ltd for repair Any units returned showing signs of tampering or accide...

Страница 5: ...3 3 P P is derived from the FD2 P but has a hardwired waterproof 3MHz probe Rh he eo o Do oppl le ex II RD2 2 has the vascular functions of the MD2 P with the addition of a Photoplethysmographic senso...

Страница 6: ...efer to the user manual If you require any assistance with safety testing your Dopplex equipment contact Huntleigh Healthcare Ltd or your supplier directly For the U K refer to the Health Equipment In...

Страница 7: ...opplex unit is to be stored for a long period of time the battery should be removed Cl le ea ani ing Excess gel should always be wiped off after use before parking the ultrasound probes The probes and...

Страница 8: ...s Degree of f protecti ion agai inst water i ingress IPX0 Degree of f Saf fety i in Presence of f Fl lammabl le Gases Not suitable for use in the presence of flammable gases Battery Type 9 Volt alkali...

Страница 9: ...mmunication is in progress FD2 P MD2 P only Audio Mini indicates power on FD2 P SD2 P RD2 MD2 P indicates power on with probe not connected Indicates battery low and requires replacement RT indicates...

Страница 10: ...et on top panel mono output MD2 2 P P RD2 2 SD2 2 P P 3 5mm stereo socket on top panel stereo output No on d di ire ec cti io ona al l Mi ini i Do oppl le ex 3 5mm mono socket Fixed f V 0 5V kHz Bi i...

Страница 11: ...flected back and detected by the receiver By demodulating the received signal removing the high frequency carrier the Doppler shifted component i e the difference between the transmitted and received...

Страница 12: ...4 6 Active Noise Reduction To increase battery life within the FD2 P SD2 P MD2 P FD1 P FD3 P and RD2 units the microcontroller will turn the unit off after 3 minutes of no signal The unit will also sw...

Страница 13: ...P FD1 P FD3 P and RD2 units use a 4 bit microcontroller to carry out house keeping duties such as driving the LCD display and auto shut off timer In addition to the 4 bit microcontroller the FD2 P SD...

Страница 14: ...itch The supply is firstly turned on by the on off switch and then the microcontroller takes over and keeps the power supply on turning the supply off when the auto shut off time haselapsed or when th...

Страница 15: ...itched in to reduce the high frequency hiss Active Noise Reduction ANR The soft limiter reduces the level of any harsh overload signals that may occur for example when the probe is moved Soft Limiter...

Страница 16: ...eo Power Amplifier FHR Signal Cond Automatic Gain Control Zero Crossers Gain Tare Probe Identification Supply Ground Slave Microcontroller Master Microcontroller Battery Monitor Display Data Output Re...

Страница 17: ...Identification The battery monitor circuit enables the microcontroller to assess the battery voltage by comparing this to a reference voltage Battery Monitor Active noise reduction is a technique use...

Страница 18: ...Data Output The All Pass network is used to apply 90 phase shift to one quadrature probe output signal with respect to the other All Pass Network The two phase shifted signals are added and subtracte...

Страница 19: ...Diagram Rx Xtal Transmitter A ceramic resonator based oscillator circuit provides a reference for the probe receiver and via the transmitter the output signal Oscillator The output from the oscillato...

Страница 20: ...cillator frequency is four times that of the probe ultrasonic output Oscillator Receive Amplifier Johnson Counter Amplifier Filter Probe Coding To Control Unit Probe Head The Johnson Counter provides...

Страница 21: ...tput signal and minimise noise and overload Amplifier Filters This superimposes a DC level depending on probe frequency onto the output signal Probe Coding 4 19 PPG Probe Receiver Block Diagram Transm...

Страница 22: ...perate at maximum resolution this signal amplified from the DAC allows the RD2 main unit to obtain the LED transmitter intensity Amplifier This circuitry stores the signal from the receive Photodiode...

Страница 23: ...e taken to ensure that all charges generated are safely discharged before they build up to a dangerous level The use of dissipative mats for the work surface and wearing anti static wrist straps are r...

Страница 24: ...f c co ompo one ents e extre eme e c ca are e i in h ha and dl li ing th he e PCB must b be e ta ak ke en a at a al ll l ti ime es W Wh he en so ol ld de eri ing ta ak ke e c ca are e to o e ensure e...

Страница 25: ...nd spring from the switch by lifting away The PCB is now free to be removed from the case by pushing the battery terminals from inside the battery compartment Care should be taken not to damage the to...

Страница 26: ...s and carefully wipe the LCD display and the window This should be done with an anti static cloth to avoid the build up of static Note When wiped the LCD display may show marks and symbols when the un...

Страница 27: ...After any repair work or dismantling the unit should always be fully tested checking that all functions operate correctly as described in the user manual Figure 1 D900 P Exploded View T4 T3 T2 T1 T5...

Страница 28: ...dures Control Unit Figure 2 D920 P D930 P Exploded View T4 T3 T2 T1 T5 Several variations of cable colours are used as shown T1 White Violet T2 Red Orange T3 Black Pink T4 Violet Turquoise T5 Screen S...

Страница 29: ...ble colours are used as shown T4 T3 T2 T1 T5 Spring contact fitted centrally at rear of base Spring contact details CE models Check remove any solder grounding land Washer detail Beryllium Washer Copp...

Страница 30: ...e el le ec ctro osta ati ic c d de evi ic ce e ESD Th he ese e ma ay b be e pe erma ane entl ly d da ama age ed d b by e el le ec ctro osta ati ic c po ote enti ia al ls e enc co ounte ere ed d i in r...

Страница 31: ...amp PCB lightly in vice along its length avoiding stress to the board Jaws engaged in probe case grooves Splitting the Probe Case Pl le ea ase e no ote e Th he e re etra ac cti il le e c ca ab bl le e...

Страница 32: ...ma ai in uni it b be efo ore e a a h he ea ad d re epl la ac ce eme ent c ca an b be egi in Se ee e se ec cti io ons 6 1 6 3 3 7 4b Dismantling Procedure D920 P D930 P FD1 P FD3 P Remove the probe cl...

Страница 33: ...eries with the DVM set to measure current and power supply check that voltage is 5V 1 as shown below using power supply adaptor PCB D920 P D930 P and adaptor cable OP VP probe CAUTION Inc co orre ec c...

Страница 34: ...ment Service Kit 4 Switch on power supply 5 Connect scope probe to the Transmitter Terminals Tx of the head adaptor PCB and observe Sine wave 6 Adjust PR1 to obtain 1 5V 0 5Vpp see Figure 3 Gnd Tx P P...

Страница 35: ...using PR1 see Figure 3 H He ea ad d A Ad da ap pt to or r P PC CB B P PC CB B R Re ef f 6 6A AH H1 18 85 5 6 6A AH H1 18 85 5 B B Head Adaptor PCB Ref 6AH185 To be used with Head Assemblies SP TDR HE...

Страница 36: ...Transmitter Head Impedance 24 Drive Voltage 3V Supply current 35mA Date Code TAD 10 Check that supply current is By adjusting T1 35mA for VP4 VP5 VP8 VP10 EZ8 11 Turn off the power supply and disconne...

Страница 37: ...the case moulding at both ends using a cotton bud as shown Appl ly gre ea ase e to o h ha atc ch he ed d a are ea a o onl ly Avo oi id d l lo oc ca ati ing h ho ol le es o of End d Ca ap 2 Slide the...

Страница 38: ...o re emo ove e a any e exc ce ess gre ea ase e 7 In the centre of the first recess apply adhesive as a continuous bead of uniform thickness around the whole circumference of the probe Apply a bead of...

Страница 39: ...CB Re solder in place using tinned copper wire 1 2 Slide the case moulding over the probe ensuring that the holes are fully aligned 3 4 Before attaching the Head Assy ensure the 4 way connector on PCB...

Страница 40: ...t this process at the tail end ensuring the wells are filled with silicon before inserting the clips After the clips are snapped into place use a clean tissue to remove any excess silicon Leave the pr...

Страница 41: ...re commencing the waterproof test 2 Adjust the air supply to give 130 10mmHg 3 The Probe is pressurised via the cable Clamp the tube around the cable end using a cable tie Check the joint to ensure th...

Страница 42: ...it Check that the chart recorder lead is plugged into the unit s waveform output socket and that the recorder is switched on 2 With the unit switched on and with a dry faceplate listen for any RFI Rad...

Страница 43: ...1 P P Switch the unit on Test the probe for noise and signal levels FD3 3 P P referring to the figure above for a suitable test site using a standard probe as a reference OP2 2HS OP3 3HS These must be...

Страница 44: ...attery 9 3 Unit Dead 1 Check integrity and continuity of sockets 2 Refer to user manual to ensure that the Dopplex is in the correct mode 9 4 No Output From Sockets 1 Refer to user manual to ensure th...

Страница 45: ...The following spare parts can be ordered from your dealer or direct from Huntleigh Healthcare Ltd using the part numbers shown below 1 1a a b b 2 2 3 3 4 4 5 5 6 6 7 7 9 9 8 8 1 10 0 1 11 1 1 12 2 1 1...

Страница 46: ...ume Control 7 B3F 3150 Calibration Switch 8 6AE103 1 Case Rear 9 6AE109 Foam Speaker Pad 10 200 901 O Rings 11 WN 1442 KB 25 20 Case Screw 12 6AE104 Battery Cover 13 SP 6AH104 Retractile Cable 14 B3W...

Страница 47: ...4 47 7 Spare Parts List 10 2 D920 P D930 P Parts List 1 1a a b b 2 2 3 3 4 4 5 5 6 6 7 7 9 9 8 8 1 10 0 1 11 1a a b b 1 12 2 1 13 3 1 14 4 1 15 5 1 16 6 1 17 7 1 18 8 1 19 9a a b b 2 20 0...

Страница 48: ...8 200 901 O Rings 9 WN 1442 KB 25 20 Case Screw 10 6AE104 Battery Cover 11a 11b SP 726222 SP 726224 Fixed Waterproof Probe and Cable 2MHz Fixed Waterproof Probe and Cable 3MHz 12 B3W 4050 On Off Switc...

Страница 49: ...etail 10 3 MD 2 SD2 P FD2 P FD1 P FD3 P RD2 Parts List 1 1 2 2 3 3 4 4 5 5 6 6 7 7 9 9 8 8 1 10 0 1 11 1 1 12 2 1 14 4a a b b c c 1 15 5 1 16 6 1 17 7a a b b 1 18 8 1 19 9 2 20 0 2 21 1 1 11 1a a 1 13...

Страница 50: ...Screw 13 6AE104 Battery Cover 14a 14b 14c SP 6AH104 SP 726222 SP 726224 Retractile Cable Fixed Waterproof Probe and Cable 2MHz Fixed Waterproof Probe and Cable 3MHz 15 B3W 4050 On Off Switch 16 6AE171...

Страница 51: ...P3HSG2 OP2 Head Assembly OP2 Head Assembly OP3 Head Assembly OP3 Head Assembly 3a 3b 3c 3d 3e SP TDR HEAD VP4HS SP TDR HEAD VP5HS SP TDR HEAD VP8HS SP TDR HEAD VP10HS SP TDR HEAD EZ8HS VP4 Head Assemb...

Страница 52: ...of probe use the same PCB The waterproof probe first fitted to the D920 P D930 P and FD1 P is the HSB series of probes The probe currently fitted in manufacturing to the D920 P D930 P FD1 P and the FD...

Страница 53: ...of Probe Cable 2MHz Fixed Waterproof Probe Cable 2MHz Fixed Waterproof Probe Cable 3MHz Fixed Waterproof Probe Cable 3MHz 2 605059 Screen Assembly 3 606318 Case Clip 4 606312 Case Moulding 5a 5b 5c 5d...

Страница 54: ...e refer to Appendix E Ref Part Number Description 1a 1b SP 726222 SP 726224 FD1 P D920 P Spare Probe FD3 P D930 P Spare Probe 2 722065 Screen Assembly 3 606331 Aqua Transducer Case Clip 4 606330 Aqua...

Страница 55: ...st 2 2 4 4a a b b c c 1 1 3 3 Ref Part Number Description 1 722061 PA8 Head Assembly 2 722065 Copper Screen Assembly 3 6AE114 Probe Case Half x 2 4a 4b 4c 76316 A M3 x 4 Grub 718 09 33890004 End Cap A...

Страница 56: ...to assist you Outside office hours an answering machine will allow you to leave a message If for any reason your Dopplex product is being returned please observe the procedure below 1 Decontaminate th...

Страница 57: ...published by CENELEC to avoid damage to the assemblies Special Handling Procedures The following should be used for all soldering operations carried out on any Dopplex product in servicing Soldering I...

Страница 58: ...5 58 8 Appendix B Appendix B Device History Record Sheet DATE PRODUCT SERIAL NUMBER TX HEAD IMPEDANCE DRIVE VOLTAGE SUPPLY CURRENT DATE CODE MAINTAINED BY...

Страница 59: ...lution 6 dots mm typical if digital Chart Speed 10 25mm sec typical Minimum number of channels 2 Full scale span 50mm or greater Input ranges 20mV mm and 50mV mm Input impedance 50k Bandwidth DC to 25...

Страница 60: ...20MHz 10Hz or better 8Hz 136dBc typical 100 to 13dBm 0 1dB or better 50 Frequency Counter Frequency Range Resolution Digits Input Range Input Impedence typical Frequency Accuracy 5Hz 20MHz 1 Hz 7 15m...

Страница 61: ...20 P D930 P FD1 P FD3 P Probe Cable Wiring Details Several variations of cable colours are used as shown 1 1 2 2 4 4 3 3 5 5 1 2 3 4 5 Screen White Black Red Yellow Screen Violet Pink Orange Turquoise...

Страница 62: ...6 62 2 Appendix F Waveform Output Connector Details RD2 MD2 P Appendix F 3 8 5 2 4 1 7 6 Pin Connection 1 RS232 TX 2 RS232 RX 3 GROUND 4 WAVEFORM 5 RS232 BUSY 6 5V 7 WAVEFORM 8 RS232 ENABLE...

Страница 63: ...6 63 3 Appendix G Trace Examples Appendix G 4 MHz 5 MHz 8 MHz 10 MHz 10mm sec 50mV mm 10mm sec 50mV mm 10mm sec 50mV mm 10mm sec 50mV mm...

Страница 64: ...ucts Division 35 Portmanmoor Road Cardiff CF24 5HN United Kingdom T 44 0 29 20485885 F 44 0 29 20492520 E sales huntleigh diagnostics co uk W www huntleigh diagnostics com Visit our Website for downlo...

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