Welch Allyn SureTemp 670 Especificaciones descargar pdf (Pagina 24)

Technical Manual

4-2 Welch-Allyn, Inc.

Probe Enhancements

The Model 678 and Model 679 thermometers have the capability to detect probe type -

oral / axillary vs. rectal. This allows the oral temperature-taking to be as fast as

possible by using different operating modes based on probe type. Axillary

temperatures are measured with oral probes in combination with the axillary mode,

providing a temperature reading in about 15 seconds. Rectal probes give a Normal

mode temperature in about 15 seconds for both models.

Probe type recognition also allows the use of minor differences in prediction

parameters tailored to the temperature taking site to help increase speed over

previous products.

The probe type is communicated to the thermometer by the use of shorting jumpers

between the ground and two of the probe connector contacts. Model 678 / 679

oral/axillary probes also incorporate a warming resistor in the tip to pre-warm the

probe before placement in the mouth or axilla, thus speeding response even further.

Probe Switch

The probe switch (S4) is activated by the probe shaft when the probe is installed or

removed from its storage well. Placing the probe into the storage well pulls processor

pin 15 high via R6. When the probe is removed, this line is pulled low. This signal is

also routed to test connector J4 pin 5 to allow automated testing of this function during

factory test. R6 allows this line to be pulled high or low at J4 during factory test

regardless of the actual switch position.

CAUTION: For the technician, J4 serves as a convenient set of “test points”

to monitor proper operation of all user switch functions.

BE CAREFUL WITH STATIC DISCHARGE! J4 TIES DIRECTLY

TO CMOS PROCESSOR INPUTS WHICH ARE EASILY DAMAGED

BY STATIC DISCHARGE. FOLLOW PROPER ESD HANDLING

TECHNIQUES.

Normal Mode

The Oral/Axillary probe is pre-warmed using a pulse width modulation (PWM)

controller to 33.9

C (93

F) upon extraction from the storage well.

•

When the probe is first extracted and colder than 33.9

C, the heater pulse widths

are at a maximum percentage ON vs. OFF to warm the probe quickly.

•

When the probe reaches 33.9

C, the pulse widths narrow to a duty cycle just

enough to maintain temperature.

•

When the probe is placed in the mouth, the heat supplied by the mouth makes the

pulse widths reduce to zero. This reduction to zero (and the probe being at least

up to 33.1

C / 91.6

F) triggers the start of the prediction algorithm.

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