Cardioline AR 600 Technical & Service Manual page 38

Press the RUN key, the tracing gives a signal of 1 impulse per second for checking, then increase the
value of the duty cycle by means of the SPEED key or decrease it with the AMPLITUDES key until
you obtain calibration of the set paper transport speed.
8.2.3 Admissible tolerance of the paper transport speed
• Speed 25 mm/sec. ± 5%;
• Speed 50 mm/sec. ± 5%.
8.3 ECG AR 600 ADV
The access sequences to the various menus are guided on the display.
To enter the service menu switch on the equipment, press the MENU key, select with the arrow key
(DOWN) and confirm the submenus INSTRUMENTS, SELF-TEST, SERVICE, then press in sequence
the FILTER – AMPLITUDES – SPEED – RUN keys and confirm.
8.3.1 Calibrating the mark
Confirm the submenu "mark calibration" , position the mark far from the sensor, (visible near the
outlet of the equipment), confirm "forward" .
The microprocessor proceeds in automatic mode to read the voltages at sensor output, voltage with
white paper and a black mark, then it calibrates the digital trimmer which regulates the current of the
photodiode at optimum values and stores them in the memory.
In the presence of the mark the calibration voltage is lower than 1.5 V.
In the absence of the mark the calibration voltage is higher than 3.5 V.
These values are shown in the printout, as is the numerical position of the digital potentiometer from 0
to 31 positions (wiper).
8.3.2 Calibrating the speed
Confirm the submenu "cal.speed" , select the speed to be calibrated 25 or 50 mm/sec. and confirm.
Calibration in automatic mode
Confirm the menu, the equipment performs calibration in automatic mode and then shows on the
display the percentage value of the duty cycle, for modulation of the impulse width, generated by the
microprocessor, determined according to the number of revs of the motor, and the number of revs of the
motor.
If the speed at calibration differs from the theoretical value by more than 15%, you must proceed in
manual mode.
Calibration in manual mode (checking)
Select and confirm the submenus "cal.speed" , the speed to be calibrated "25 mm/sec." or "50
mm/sec." and "manual" calibration mode.
The display next shows the messages: Output PWM0 – Duty = xx.x% with the possibility of selecting
test – change – quit .
Confirming the "test" command enables paper transport and the printout shows a signal of 1 impulse
per second, from which you calculate whether to increase or decrease the duty cycle to obtain the set
paper transport speed. Next select and confirm "change" and act accordingly.
When the speed has been correctly calibrated, select and confirm "quit" .
NOTE:
All the set data and the configuration of the equipment are saved each time it is switched off.
AR600
AR600 ADV
®
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