Service manual

IQmark Digital Spirometer Operation Manual
95
detection circuit, and identification device and encodes the data with packets and sends it to
the PC through the RS232 interface circuit.
Serial port controller
The serial signal sent out by the PIC micro controller is relayed to the system through the
MAX3232CSE RS-232 transceiver. To provide the maximum safety for the patient the
Spirometer hardware and the PC are isolated via double insulation.
Power Supply
The IQmark Digital Spirometer uses two AAA batteries for power. A step up DC-DC
converter is used to provide a 6.2 V power source. Two 5.0 V regulators are used to provide
power sources for the analog and digital circuits. A 2.5 V reference voltage is derived with a
voltage divider and current amplifier to provide the Spirometer’s pressure signal baseline and
A/D reference voltage. The IQmark Digital Spirometer’s power is switched ON or OFF by
software control via the DTR bit of the RS232 port.
Low Battery Sensor Circuit
The low battery detection circuit monitors the battery voltage and alerts the micro controller
when the energy in the batteries is low. The micro controller causes the LED in the handle to
glow RED and sends a LOW BATTERY message that is displayed on the screen by the
Spirometer software. The user can complete the current testing session with confidence but
should replace the batteries before starting a new test session.
System Maintenance and Obtaining Service
The IQmark Digital Spirometer is a battery powered, portable device, which requires little
maintenance and contains no user adjustable or serviceable components inside. There are no
fuses in the Spirometer handle. In the event that the Spirometer hardware does not appear to
function correctly and the remedies offered in the troubleshooting guide do not correct the
problem, contact Midmark Diagnostics Group Customer Service. In the event that Repairs are
required our staff will provide complete instructions on returning the Spirometer.
DO NOT send your Spirometer without first contacting a Customer Service representative. A
return authorization is required prior to the return of the device. Help us to service you better
and minimize your down time. Obtain a Return Materials Authorization (RMA) number prior
to returning your Spirometer.
Midmark Diagnostics Group
1125 W. 190th Street
Gardena, CA 90248
Tel: [phone]
www.midmarkdiagnostics.comwww.midmarkdiagnostics.com
To obtain optimum benefits and to ensure the best performance of this device, the user
should read and understand all information offered in this Operation Manual.
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