Service Manual Pony Graphic
Chapter 2
Functional Description
2.2
2. Functional description
2.1. General
Overview
Pony graphic is a portable spirometer designed for carrying out the typical test of the screening
spirometry: Forced Vital Capacity (Pre and Post), Slow Vital Capacity (Inspiratory and
Expiratory) and Maximum Voluntary Ventilation.
The system is mainly composed of following parts
2.1.1. Pony graphic Unit
It is the core of the system; contains the microcontroller and the electronics necessary to
operate the peripherals and to manage the different measurements. It can be operated either in
stand alone mode using the internal rechargeable NiCd batteries or connected to the AC/DC
adapter. It is connected to the Turbine flowmeter during the measurement. It can be connected
to a PC compatible or an external printer by the RS232 interface for data management and
direct printing.
2.1.2. Flowmeter
It is composed by the turbine and the Optoelectronic transducer; the air passing through the
helical conveyors, makes a spiral motion which causes the rotation of the turbine rotor. The
rolling blade interrupts the infrared light sources beamed by the diodes of the optoelectronic
transducer. Every interruption represents half turn of the rotor, this allows to measure the
number of turn in the time. There is a constant ratio between air passing trough the turbine and
number of turns. This allows to calculate an accurate measurement of volume and flows.
2.1.3. Battery Charger (AC /DC Adapter)
The battery charger (AC /Dc Adapter) can charge NiCd batteries of the Pony graphic unit at the
same time battery pack inside the unit and also supply power to the unit. It can operate at both,
110 or 220V AC inputs. It is also possible to use the charger in car using cigar light adapter
cable supplied with standard accessories.
The battery charge status is indicates by a flashing green Led and completely charged one with
Non Flashing one on the top cover pony unit.
2.1.4. RS232
cable
It allows to download the data of the test to a PC compatible or to print the result with an
external Printer (see the User's Manual for the printer specifications).
