Novametrix Medical Systems 515 Service Manual page 38

Calibration and Adjuslments:Adjustment Procedure
Service Manual: Model
4.2.33
4.2.34
4.2.35
4.2.36
A ^ 'in
n-.jL.J /
4.2.38
4.2.39
4.2.40
4.2.41
4.2.42
Verify that the signal on IC22 pin 1 increases smoothly and linearly fro
volts to approximately 2 volts, while IC22 pin 8 decreases smoothly and
early from approximately 4 volts to 2 volts.
Connect the test jack to the front panel connector on the monitor.
Press
Next
twice, select
Adc
and use the
Inc
and
Dec
keys to monitor cha
0 (SATURATION% display).
Press
Prev
twice, select
Leds
then press
Red.
Csc the
Inc
and
Dec
softkeys
— . o n r> c
iw im i 1 IS.
1
n
''PULSE RATE
play) is 192 ±1, check that the value of the DAC (red drive current) is 6E
10H.
Press the
Next
key three times then select the
Adc
option. Use the
Inc
Dec
keys to monitor channel 4.
Press
Prev
twice then select
Led.
Press the
Ir
softkey.
Use the
Inc
and
Dec
softkeys so that the channel 4 value is 192 ± 1, check
the value of the DAC (ir drive current) is
B8h
±
10H.
Remove the test jack from the front panel connector. Connect the TB50()y
the monitor, set the SIGNAL ATTENUATION to 5 and the SATURATIOP
0. Turn the TBSOOA on.
Monitor IC21 pin 7. Verify that at the base of the pulse just before they ;
to rise is 0 volts ± 50 mv.
4.2.43 Monitor IC21 pin 1. Verify that the base of the pulse just before they star
rise is 0 volts ± 75 mv.
4.2.44 Set the TB500A to 92%, and the SIG ATTEN. to 6. Monitor IC18 pin 14 \
channel A of the oscilloscope (AC coupled), monitor IC 15 pin 8 with chat
B of the oscilloscope. Verify a 1 Hz signal on channel B with a gain of 0.1
that on channel A. Monitor IC18 pin 8 with channel A, IC15 pin 14 with cl
nel B, verify channel B has a gain of 0.8 of that on A. In both cases check
the signal on A is 200 mv ±150 mv.
4.2.45 Select the
Fets
test (press
Next
three times), turn them
On,
verify the sigi
are grounded.
4.2.46 Monitor pin 7 of IC13 with the oscilloscope. Press Prev, select Offs then p
Ramp.
Verify a squarewave of approximately 4 volts peak (with a period of
msec high and 2.5 msec low) that steadily decrease in amplitude and set
to a steady DC value at approximately 2 volts.