Page 1: Table Of Contents
Looking after your Micro/Micro Plus Introduction Before you begin Micro/Micro Plus system Overview Micro Medical Digital Volume Transducer Cleaning the Micro Medical Digital Volume Transducer Micro/Micro Plus exploded view Disassembling the Micro/Micro Plus for Circuit Investigation Reassembling the Micro/Micro Plus...
Page 2 Micro Medical Limited or its appointed agent in your country or region and arrange the despatch of the product to a Micro Medical Limited Service Centre.
Page 3: Safety Precaution
Read this manual thoroughly before proceeding with the service. If in any doubt please contact the service centre at Micro Medical Limited or their accredited agent in your country or region. Important Safeguards o Read all of the instructions.
Page 4: Micro/Micro Plus System Overview
Micro/Micro Plus system overview. The Micro Medical Micro/Micro Plus Spirometer consists of a hand held microcomputer unit (2) incorporating a Micro Medical digital volume transducer (1). 1. Micro Medical Digital Volume Transducer. 2. Micro microcomputer unit. 3. Lung Function Calculator.
Page 5: Micro Medical Digital Volume Transducer
Micro Medical Digital Volume Transducer The Micro Medical digital volume transducer consists of an acrylic tube with a vane (3) positioned between a stator (1) and a cross bar (2). The low inertia vane is attached to a stainless steel pivot (5) which is free to rotate on two jewelled bearings (4) mounted at the centre of the stator plate and cross bar.
Page 6: Volume Transducer
15 minutes. (Alcohol and chloride solutions should be avoided.) 3. After cleaning or sterilising, the transducer should be rinsed in distilled water and dried. 4. Reassemble the transducer into the Micro/Micro Plus Spirometer. Alkacide is available from Micro Medical in convenient 250ml plastic bottles (Cat No. SSC1000)
Page 7 Micro/Micro Plus Spirometer exploded view (fig 1) Ite m 8 Ite m 5 Ite m 4 Ite m 7 Ite m 6 Ite m 1 Ite m 3 Ite m 2 Ite m 8 1. Bottom Moulding 2. Top Moulding 3.
Page 8: Disassembling The Micro/Micro Plus For Circuit Investigation
3 Remove the battery and place to one side. 4 Remove the 2 screws on the bottom moulding. 5 Turn the Micro/Micro Plus face up and ease the top moulding from the bottom and turn the top moulding over so as the unit is in two halves.
Page 9: Reassembling The Micro/Micro Plus
Reassembling the Micro/Micro Plus 1. Place the PCB into the bottom moulding and wire battery lead as as shown in fig 2. 2. Replace items 4, 5 and 6 (Fig1) into the bottom moulding. 3. Position top moulding on top of bottom moulding and push together (ensure that the battery leads are not trapped).
Page 10: Circuit Description
Circuit description The circuit is based on the Motorola one time programmable (OTP) microcontroller MC68HC705C9ACFN (IC1) operating at a clock frequency of 1 MHz. This processor contains 7 Kbytes of EPROM, 176 Bytes of RAM, programmable output latches, and a serial peripheral interface (SPI). The processor monitors pulses from the transducer, calculates the spirometry measurements, and directly drives the LCD display according to the position of the slide switch.
Page 11 Calibration The sensitivity of the Micro Medical digital volume transducer depends only upon the fixed geometry of the stator and is inherently stable. The calibration will be unaffected by any dirt which may build up on the stator due to poor cleaning procedures.
Page 12: Technical Data
Technical Data Transducer Type Micro Medical Uni-Directional Digital Volume Resolution 10ml Accuracy +/-3%.(To ATS recommendations Standardisation of Spirometry 1994 update for flows and volumes). Volume Range 0.1-9.99 litres B.T.P.S Flow Range 30L/min-1000L/min Display Custom 3½ digit Liquid crystal Power Supply...
Page 13: Technical Support
Great Britain and World Headquarters Micro Medical Ltd PO Box 6 Rochester Kent ME1 2AZ Telephone + 44 (0)1634 360044 +44 (0)1634 360055 Web Site http://www.micromedical.com.uk Email support@micromedical.com.uk Contact Micro Medical Ltd for the local agent in your region or country for local service:...
Page 14: Parts List
47pF CERAMIC CAPACITOR SIZE 1206 47pF CERAMIC CAPACITOR SIZE 1206 0.33µF SURFACE MOUNT MULTILAYER CERAMIC SIZE 0805 (MICRO PLUS ONLY) 47nF SURFACE MOUNT MULTILAYER CERAMIC SIZE 0805 (MICRO PLUS ONLY) 0.33µF SURFACE MOUNT MULTILAYER CERAMIC SIZE 0805 (MICRO PLUS ONLY) 0.33µF SURFACE MOUNT MULTILAYER CERAMIC SIZE 0805 (MICRO PLUS ONLY)

This manual is also suitable for:

Micro plus