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Section 14
Calibration Tests
60
Model 520A Service Manual
5693-90-01
PRELIMINARY
14.2.3
Flip the monitor over to expose the bottom cover and remove the four
cover screws. Holding both the top and bottom halves together, flip the
monitor over again and set it on its bottom cover.
14.2.4
Lift the top cover from the monitor and set it aside. Set the Red Alert Bar
lens aside with the cover for safe keeping.
Test Procedure
14.3
Unless otherwise specified all measurements are with respect to isolated ground.
Use the top of R4 (end closest to IC2) as ground reference.
14.3.1
Attach a line cord and place the mains switch to the “|” position. Verify
that the green
LED on the front panel illuminates. The monitor may
power up when the Mains switch is set to“|”, if this occurs turn the monitor
off with the front panel button.
14.3.2
Measure the voltage at J102 pin 2 and verify 13.2 VDC ± 0.4 volts.
This voltage is dependent on a fully charged battery installed. If an
installed battery is less than fully charged, the measured voltage will not
match the expected voltage.
14.3.3
Simultaneously press the leftmost softkey and the power button.
While
Calculating Checksum
is displayed, press and hold the third
softkey from the right until
Novametrix Inc Production Test
appears.
14.3.4
Measure the voltage at TP1. Verify 5.000V ± 50mV. Adjust VR1 if
necessary.
14.3.5
Verify the following voltages:
Location
Signal Name
Voltage
IC40 pin 4
-VA
-12.00V ± 500mV
IC40 pin 8
+VA
12.00V ± 500mV
IC20 pin 28
VBACK
4.75V ± 250mV
IC37 pin 14
+V5
5.00V ± 250mV
IC37 pin 7
-V5
-5.00V ± 250mV
IC37 pin 10
VREF
2.500V ± 5mV
IC36 pin 1
4VREF
4.045V ± 50mV
IC30 pin 14
-4VREF
-4.045V ± 100mV
Содержание OXYPLETH 520A
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